Release 0.77.1

Closes #73.

.gitignore

@@ -1,3 +1,4 @@
+sshuttle/version.py
 *.pyc
 *~
 *.8

.travis.yml

@@ -0,0 +1,11 @@
+language: python
+python:
+- 2.7
+- 3.5
+- pypy
+
+install:
+    - travis_retry pip install -q pytest mock
+
+script:
+  - PYTHONPATH=. py.test

CHANGES.rst

@@ -0,0 +1,39 @@
+Release 0.77.1 (Mar 7, 2016)
+============================
+
+* Use semantic versioning. http://semver.org/
+* Update GPL 2 license text.
+* New release to fix PyPI.
+
+
+Release 0.77 (Mar 3, 2016)
+==========================
+
+* Various bug fixes.
+* Fix Documentation.
+* Add fix for MacOS X issue.
+* Add support for OpenBSD.
+
+
+Release 0.76 (Jan 17, 2016)
+===========================
+
+* Add option to disable IPv6 support.
+* Update documentation.
+* Move documentation, including man page, to Sphinx.
+* Use setuptools-scm for automatic versioning.
+
+
+Release 0.75 (Jan 12, 2016)
+===========================
+
+* Revert change that broke sshuttle entry point.
+
+
+Release 0.74 (Jan 10, 2016)
+===========================
+
+* Add CHANGES.rst file.
+* Numerous bug fixes.
+* Python 3.5 fixes.
+* PF fixes, especially for BSD.

LICENSE

@@ -1,25 +1,22 @@
-		  GNU LIBRARY GENERAL PUBLIC LICENSE
-		       Version 2, June 1991
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
 
- Copyright (C) 1991 Free Software Foundation, Inc.
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+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
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+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
 
-			    NO WARRANTY
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
 
-  15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
-WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
-EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
-OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
-KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
-LIBRARY IS WITH YOU.  SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
-THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+                            NO WARRANTY
 
-  16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
-WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
-AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
-FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
-CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
-LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
-RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
-FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
-SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
-DAMAGES.
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
 
-		     END OF TERMS AND CONDITIONS
-
-     Appendix: How to Apply These Terms to Your New Libraries
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
 
-  If you develop a new library, and you want it to be of the greatest
-possible use to the public, we recommend making it free software that
-everyone can redistribute and change.  You can do so by permitting
-redistribution under these terms (or, alternatively, under the terms of the
-ordinary General Public License).
+                     END OF TERMS AND CONDITIONS
 
-  To apply these terms, attach the following notices to the library.  It is
-safest to attach them to the start of each source file to most effectively
-convey the exclusion of warranty; and each file should have at least the
-"copyright" line and a pointer to where the full notice is found.
+            How to Apply These Terms to Your New Programs
 
-    <one line to give the library's name and a brief idea of what it does.>
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
     Copyright (C) <year>  <name of author>
 
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Library General Public
-    License as published by the Free Software Foundation; either
-    version 2 of the License, or (at your option) any later version.
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
 
-    This library is distributed in the hope that it will be useful,
+    This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Library General Public License for more details.
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
 
-    You should have received a copy of the GNU Library General Public
-    License along with this library; if not, write to the Free
-    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
 Also add information on how to contact you by electronic and paper mail.
 
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
 You should also get your employer (if you work as a programmer) or your
-school, if any, to sign a "copyright disclaimer" for the library, if
+school, if any, to sign a "copyright disclaimer" for the program, if
 necessary.  Here is a sample; alter the names:
 
-  Yoyodyne, Inc., hereby disclaims all copyright interest in the
-  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
 
-  <signature of Ty Coon>, 1 April 1990
+  <signature of Ty Coon>, 1 April 1989
   Ty Coon, President of Vice
 
-That's all there is to it!
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

MANIFEST.in

@@ -0,0 +1,13 @@
+include *.txt
+include *.rst
+include *.py
+include MANIFEST.in
+include LICENSE
+include run
+include tox.ini
+exclude sshuttle/version.py
+recursive-include docs *.bat
+recursive-include docs *.py
+recursive-include docs *.rst
+recursive-include docs Makefile
+recursive-include sshuttle *.py

Makefile

@@ -1,10 +0,0 @@
-all:
-
-Makefile:
-	@
-
-%: FORCE
-	+./do $@
-
-.PHONY: FORCE
-

README.md

@@ -1,177 +0,0 @@
-
-WARNING:
-On MacOS 10.6 (at least up to 10.6.6), your network will
-stop responding about 10 minutes after the first time you
-start sshuttle, because of a MacOS kernel bug relating to
-arp and the net.inet.ip.scopedroute sysctl.  To fix it,
-just switch your wireless off and on. Sshuttle makes the
-kernel setting it changes permanent, so this won't happen
-again, even after a reboot.
-
-
-sshuttle: where transparent proxy meets VPN meets ssh
-=====================================================
-
-As far as I know, sshuttle is the only program that solves the following
-common case:
-
- - Your client machine (or router) is Linux, FreeBSD, or MacOS.
-
- - You have access to a remote network via ssh.
-
- - You don't necessarily have admin access on the remote network.
-
- - The remote network has no VPN, or only stupid/complex VPN
-    protocols (IPsec, PPTP, etc). Or maybe you <i>are</i> the
-    admin and you just got frustrated with the awful state of
-    VPN tools.
-
- - You don't want to create an ssh port forward for every
-    single host/port on the remote network.
-
- - You hate openssh's port forwarding because it's randomly
-    slow and/or stupid.
- 
- - You can't use openssh's PermitTunnel feature because
-    it's disabled by default on openssh servers; plus it does
-    TCP-over-TCP, which has terrible performance (see below).
-    
-
-Prerequisites
--------------
-
- - sudo, su, or logged in as root on your client machine.
-   (The server doesn't need admin access.)
-   
- - If you use Linux on your client machine:
-   iptables installed on the client, including at
-   least the iptables DNAT, REDIRECT, and ttl modules. 
-   These are installed by default on most Linux distributions. 
-   (The server doesn't need iptables and doesn't need to be
-   Linux.)
-   
- - If you use MacOS or BSD on your client machine:
-   Your kernel needs to be compiled with IPFIREWALL_FORWARD
-   (MacOS has this by default) and you need to have ipfw
-   available. (The server doesn't need to be MacOS or BSD.)
-
-
-This is how you use it:
------------------------
-
- - <tt>git clone git://github.com/apenwarr/sshuttle</tt>
-    on your client machine. You'll need root or sudo
-    access, and python needs to be installed.
-
- - <tt>./sshuttle -r username@sshserver 0.0.0.0/0 -vv</tt>
-
-(You may be prompted for one or more passwords; first, the
-local password to become root using either sudo or su, and
-then the remote ssh password.  Or you might have sudo and ssh set
-up to not require passwords, in which case you won't be
-prompted at all.)
-
-That's it!  Now your local machine can access the remote network as if you
-were right there.  And if your "client" machine is a router, everyone on
-your local network can make connections to your remote network.
-
-You don't need to install sshuttle on the remote server;
-the remote server just needs to have python available. 
-sshuttle will automatically upload and run its source code
-to the remote python interpreter.
-
-This creates a transparent proxy server on your local machine for all IP
-addresses that match 0.0.0.0/0.  (You can use more specific IP addresses if
-you want; use any number of IP addresses or subnets to change which
-addresses get proxied.  Using 0.0.0.0/0 proxies <i>everything</i>, which is
-interesting if you don't trust the people on your local network.)
-
-Any TCP session you initiate to one of the proxied IP addresses will be
-captured by sshuttle and sent over an ssh session to the remote copy of
-sshuttle, which will then regenerate the connection on that end, and funnel
-the data back and forth through ssh.
-
-Fun, right?  A poor man's instant VPN, and you don't even have to have
-admin access on the server.
-
-
-Theory of Operation
--------------------
-
-sshuttle is not exactly a VPN, and not exactly port forwarding.  It's kind
-of both, and kind of neither.
-
-It's like a VPN, since it can forward every port on an entire network, not
-just ports you specify.  Conveniently, it lets you use the "real" IP
-addresses of each host rather than faking port numbers on localhost.
-
-On the other hand, the way it *works* is more like ssh port forwarding than
-a VPN.  Normally, a VPN forwards your data one packet at a time, and
-doesn't care about individual connections; ie. it's "stateless" with respect
-to the traffic.  sshuttle is the opposite of stateless; it tracks every
-single connection.
-
-You could compare sshuttle to something like the old <a
-href="http://en.wikipedia.org/wiki/Slirp">Slirp</a> program, which was a
-userspace TCP/IP implementation that did something similar.  But it
-operated on a packet-by-packet basis on the client side, reassembling the
-packets on the server side.  That worked okay back in the "real live serial
-port" days, because serial ports had predictable latency and buffering.
-
-But you can't safely just forward TCP packets over a TCP session (like ssh),
-because TCP's performance depends fundamentally on packet loss; it
-<i>must</i> experience packet loss in order to know when to slow down!  At
-the same time, the outer TCP session (ssh, in this case) is a reliable
-transport, which means that what you forward through the tunnel <i>never</i>
-experiences packet loss.  The ssh session itself experiences packet loss, of
-course, but TCP fixes it up and ssh (and thus you) never know the
-difference.  But neither does your inner TCP session, and extremely screwy
-performance ensues.
-
-sshuttle assembles the TCP stream locally, multiplexes it statefully over
-an ssh session, and disassembles it back into packets at the other end.  So
-it never ends up doing TCP-over-TCP.  It's just data-over-TCP, which is
-safe.
-
-
-Useless Trivia
---------------
-
-Back in 1998 (12 years ago!  Yikes!), I released the first version of <a
-href="http://alumnit.ca/wiki/?TunnelVisionReadMe">Tunnel Vision</a>, a
-semi-intelligent VPN client for Linux.  Unfortunately, I made two big mistakes: 
-I implemented the key exchange myself (oops), and I ended up doing
-TCP-over-TCP (double oops).  The resulting program worked okay - and people
-used it for years - but the performance was always a bit funny.  And nobody
-ever found any security flaws in my key exchange, either, but that doesn't
-mean anything. :)
-
-The same year, dcoombs and I also released Fast Forward, a proxy server
-supporting transparent proxying.  Among other things, we used it for
-automatically splitting traffic across more than one Internet connection (a
-tool we called "Double Vision").
-
-I was still in university at the time.  A couple years after that, one of my
-professors was working with some graduate students on the technology that
-would eventually become <a href="http://www.slipstream.com/">Slipstream
-Internet Acceleration</a>.  He asked me to do a contract for him to build an
-initial prototype of a transparent proxy server for mobile networks.  The
-idea was similar to sshuttle: if you reassemble and then disassemble the TCP
-packets, you can reduce latency and improve performance vs.  just forwarding
-the packets over a plain VPN or mobile network.  (It's unlikely that any of
-my code has persisted in the Slipstream product today, but the concept is
-still pretty cool.  I'm still horrified that people use plain TCP on
-complex mobile networks with crazily variable latency, for which it was
-never really intended.)
-
-That project I did for Slipstream was what first gave me the idea to merge
-the concepts of Fast Forward, Double Vision, and Tunnel Vision into a single
-program that was the best of all worlds.  And here we are, at last, 10 years
-later.  You're welcome.
-
---
-Avery Pennarun <apenwarr@gmail.com>
-
-Mailing list:
-   Subscribe by sending a message to <sshuttle+subscribe@googlegroups.com>
-   List archives are at: http://groups.google.com/group/sshuttle

README.rst

@@ -0,0 +1,47 @@
+sshuttle: where transparent proxy meets VPN meets ssh
+=====================================================
+
+As far as I know, sshuttle is the only program that solves the following
+common case:
+
+- Your client machine (or router) is Linux, FreeBSD, or MacOS.
+
+- You have access to a remote network via ssh.
+
+- You don't necessarily have admin access on the remote network.
+
+- The remote network has no VPN, or only stupid/complex VPN
+  protocols (IPsec, PPTP, etc). Or maybe you *are* the
+  admin and you just got frustrated with the awful state of
+  VPN tools.
+
+- You don't want to create an ssh port forward for every
+  single host/port on the remote network.
+
+- You hate openssh's port forwarding because it's randomly
+  slow and/or stupid.
+
+- You can't use openssh's PermitTunnel feature because
+  it's disabled by default on openssh servers; plus it does
+  TCP-over-TCP, which has terrible performance (see below).
+
+
+Obtaining sshuttle
+------------------
+
+- From PyPI::
+
+      pip install sshuttle
+
+- Clone::
+
+      git clone https://github.com/sshuttle/sshuttle.git
+      ./setup.py install
+
+Documentation
+-------------
+The documentation for the stable version is available at:
+http://sshuttle.readthedocs.org/
+
+The documentation for the latest development version is available at:
+http://sshuttle.readthedocs.org/en/latest/

all.do

@@ -1,11 +0,0 @@
-exec >&2
-UI=
-[ "$(uname)" = "Darwin" ] && UI=ui-macos/all
-redo-ifchange sshuttle.8 $UI
-
-echo
-echo "What now?"
-[ -z "$UI" ] || echo "- Try the MacOS GUI: open ui-macos/Sshuttle*.app"
-echo "- Run sshuttle: ./sshuttle --dns -r HOSTNAME 0/0"
-echo "- Read the README: less README.md"
-echo "- Read the man page: less sshuttle.md"

assembler.py

@@ -1,26 +0,0 @@
-import sys, zlib
-
-z = zlib.decompressobj()
-mainmod = sys.modules[__name__]
-while 1:
-    name = sys.stdin.readline().strip()
-    if name:
-        nbytes = int(sys.stdin.readline())
-        if verbosity >= 2:
-            sys.stderr.write('server: assembling %r (%d bytes)\n'
-                             % (name, nbytes))
-        content = z.decompress(sys.stdin.read(nbytes))
-        exec compile(content, name, "exec")
-
-        # FIXME: this crushes everything into a single module namespace,
-        # then makes each of the module names point at this one. Gross.
-        assert(name.endswith('.py'))
-        modname = name[:-3]
-        mainmod.__dict__[modname] = mainmod
-    else:
-        break
-
-verbose = verbosity
-sys.stderr.flush()
-sys.stdout.flush()
-main()

clean.do

@@ -1,2 +0,0 @@
-redo ui-macos/clean
-rm -f *~ */*~ .*~ */.*~ *.8 *.tmp */*.tmp *.pyc */*.pyc

client.py

@@ -1,387 +0,0 @@
-import struct, socket, select, errno, re, signal, time
-import compat.ssubprocess as ssubprocess
-import helpers, ssnet, ssh, ssyslog
-from ssnet import SockWrapper, Handler, Proxy, Mux, MuxWrapper
-from helpers import *
-
-_extra_fd = os.open('/dev/null', os.O_RDONLY)
-
-def got_signal(signum, frame):
-    log('exiting on signal %d\n' % signum)
-    sys.exit(1)
-
-
-_pidname = None
-def check_daemon(pidfile):
-    global _pidname
-    _pidname = os.path.abspath(pidfile)
-    try:
-        oldpid = open(_pidname).read(1024)
-    except IOError, e:
-        if e.errno == errno.ENOENT:
-            return  # no pidfile, ok
-        else:
-            raise Fatal("can't read %s: %s" % (_pidname, e))
-    if not oldpid:
-        os.unlink(_pidname)
-        return  # invalid pidfile, ok
-    oldpid = int(oldpid.strip() or 0)
-    if oldpid <= 0:
-        os.unlink(_pidname)
-        return  # invalid pidfile, ok
-    try:
-        os.kill(oldpid, 0)
-    except OSError, e:
-        if e.errno == errno.ESRCH:
-            os.unlink(_pidname)
-            return  # outdated pidfile, ok
-        elif e.errno == errno.EPERM:
-            pass
-        else:
-            raise
-    raise Fatal("%s: sshuttle is already running (pid=%d)"
-                % (_pidname, oldpid))
-
-
-def daemonize():
-    if os.fork():
-        os._exit(0)
-    os.setsid()
-    if os.fork():
-        os._exit(0)
-
-    outfd = os.open(_pidname, os.O_WRONLY|os.O_CREAT|os.O_EXCL, 0666)
-    try:
-        os.write(outfd, '%d\n' % os.getpid())
-    finally:
-        os.close(outfd)
-    os.chdir("/")
-
-    # Normal exit when killed, or try/finally won't work and the pidfile won't
-    # be deleted.
-    signal.signal(signal.SIGTERM, got_signal)
-    
-    si = open('/dev/null', 'r+')
-    os.dup2(si.fileno(), 0)
-    os.dup2(si.fileno(), 1)
-    si.close()
-
-    ssyslog.stderr_to_syslog()
-
-
-def daemon_cleanup():
-    try:
-        os.unlink(_pidname)
-    except OSError, e:
-        if e.errno == errno.ENOENT:
-            pass
-        else:
-            raise
-
-
-def original_dst(sock):
-    try:
-        SO_ORIGINAL_DST = 80
-        SOCKADDR_MIN = 16
-        sockaddr_in = sock.getsockopt(socket.SOL_IP,
-                                      SO_ORIGINAL_DST, SOCKADDR_MIN)
-        (proto, port, a,b,c,d) = struct.unpack('!HHBBBB', sockaddr_in[:8])
-        assert(socket.htons(proto) == socket.AF_INET)
-        ip = '%d.%d.%d.%d' % (a,b,c,d)
-        return (ip,port)
-    except socket.error, e:
-        if e.args[0] == errno.ENOPROTOOPT:
-            return sock.getsockname()
-        raise
-
-
-class FirewallClient:
-    def __init__(self, port, subnets_include, subnets_exclude, dnsport):
-        self.port = port
-        self.auto_nets = []
-        self.subnets_include = subnets_include
-        self.subnets_exclude = subnets_exclude
-        self.dnsport = dnsport
-        argvbase = ([sys.argv[1], sys.argv[0], sys.argv[1]] +
-                    ['-v'] * (helpers.verbose or 0) +
-                    ['--firewall', str(port), str(dnsport)])
-        if ssyslog._p:
-            argvbase += ['--syslog']
-        argv_tries = [
-            ['sudo', '-p', '[local sudo] Password: '] + argvbase,
-            ['su', '-c', ' '.join(argvbase)],
-            argvbase
-        ]
-
-        # we can't use stdin/stdout=subprocess.PIPE here, as we normally would,
-        # because stupid Linux 'su' requires that stdin be attached to a tty.
-        # Instead, attach a *bidirectional* socket to its stdout, and use
-        # that for talking in both directions.
-        (s1,s2) = socket.socketpair()
-        def setup():
-            # run in the child process
-            s2.close()
-        e = None
-        if os.getuid() == 0:
-            argv_tries = argv_tries[-1:]  # last entry only
-        for argv in argv_tries:
-            try:
-                if argv[0] == 'su':
-                    sys.stderr.write('[local su] ')
-                self.p = ssubprocess.Popen(argv, stdout=s1, preexec_fn=setup)
-                e = None
-                break
-            except OSError, e:
-                pass
-        self.argv = argv
-        s1.close()
-        self.pfile = s2.makefile('wb+')
-        if e:
-            log('Spawning firewall manager: %r\n' % self.argv)
-            raise Fatal(e)
-        line = self.pfile.readline()
-        self.check()
-        if line != 'READY\n':
-            raise Fatal('%r expected READY, got %r' % (self.argv, line))
-
-    def check(self):
-        rv = self.p.poll()
-        if rv:
-            raise Fatal('%r returned %d' % (self.argv, rv))
-
-    def start(self):
-        self.pfile.write('ROUTES\n')
-        for (ip,width) in self.subnets_include+self.auto_nets:
-            self.pfile.write('%d,0,%s\n' % (width, ip))
-        for (ip,width) in self.subnets_exclude:
-            self.pfile.write('%d,1,%s\n' % (width, ip))
-        self.pfile.write('GO\n')
-        self.pfile.flush()
-        line = self.pfile.readline()
-        self.check()
-        if line != 'STARTED\n':
-            raise Fatal('%r expected STARTED, got %r' % (self.argv, line))
-
-    def sethostip(self, hostname, ip):
-        assert(not re.search(r'[^-\w]', hostname))
-        assert(not re.search(r'[^0-9.]', ip))
-        self.pfile.write('HOST %s,%s\n' % (hostname, ip))
-        self.pfile.flush()
-
-    def done(self):
-        self.pfile.close()
-        rv = self.p.wait()
-        if rv:
-            raise Fatal('cleanup: %r returned %d' % (self.argv, rv))
-
-
-def _main(listener, fw, ssh_cmd, remotename, python, latency_control,
-          dnslistener, seed_hosts, auto_nets,
-          syslog, daemon):
-    handlers = []
-    if helpers.verbose >= 1:
-        helpers.logprefix = 'c : '
-    else:
-        helpers.logprefix = 'client: '
-    debug1('connecting to server...\n')
-
-    try:
-        (serverproc, serversock) = ssh.connect(ssh_cmd, remotename, python,
-                        stderr=ssyslog._p and ssyslog._p.stdin,
-                        options=dict(latency_control=latency_control))
-    except socket.error, e:
-        if e.args[0] == errno.EPIPE:
-            raise Fatal("failed to establish ssh session (1)")
-        else:
-            raise
-    mux = Mux(serversock, serversock)
-    handlers.append(mux)
-
-    expected = 'SSHUTTLE0001'
-    try:
-        initstring = serversock.recv(len(expected))
-    except socket.error, e:
-        if e.args[0] == errno.ECONNRESET:
-            raise Fatal("failed to establish ssh session (2)")
-        else:
-            raise
-    
-    rv = serverproc.poll()
-    if rv:
-        raise Fatal('server died with error code %d' % rv)
-        
-    if initstring != expected:
-        raise Fatal('expected server init string %r; got %r'
-                        % (expected, initstring))
-    debug1('connected.\n')
-    print 'Connected.'
-    sys.stdout.flush()
-    if daemon:
-        daemonize()
-        log('daemonizing (%s).\n' % _pidname)
-    elif syslog:
-        debug1('switching to syslog.\n')
-        ssyslog.stderr_to_syslog()
-
-    def onroutes(routestr):
-        if auto_nets:
-            for line in routestr.strip().split('\n'):
-                (ip,width) = line.split(',', 1)
-                fw.auto_nets.append((ip,int(width)))
-
-        # we definitely want to do this *after* starting ssh, or we might end
-        # up intercepting the ssh connection!
-        #
-        # Moreover, now that we have the --auto-nets option, we have to wait
-        # for the server to send us that message anyway.  Even if we haven't
-        # set --auto-nets, we might as well wait for the message first, then
-        # ignore its contents.
-        mux.got_routes = None
-        fw.start()
-    mux.got_routes = onroutes
-
-    def onhostlist(hostlist):
-        debug2('got host list: %r\n' % hostlist)
-        for line in hostlist.strip().split():
-            if line:
-                name,ip = line.split(',', 1)
-                fw.sethostip(name, ip)
-    mux.got_host_list = onhostlist
-
-    def onaccept():
-        global _extra_fd
-        try:
-            sock,srcip = listener.accept()
-        except socket.error, e:
-            if e.args[0] in [errno.EMFILE, errno.ENFILE]:
-                debug1('Rejected incoming connection: too many open files!\n')
-                # free up an fd so we can eat the connection
-                os.close(_extra_fd)
-                try:
-                    sock,srcip = listener.accept()
-                    sock.close()
-                finally:
-                    _extra_fd = os.open('/dev/null', os.O_RDONLY)
-                return
-            else:
-                raise
-        dstip = original_dst(sock)
-        debug1('Accept: %s:%r -> %s:%r.\n' % (srcip[0],srcip[1],
-                                              dstip[0],dstip[1]))
-        if dstip[1] == listener.getsockname()[1] and islocal(dstip[0]):
-            debug1("-- ignored: that's my address!\n")
-            sock.close()
-            return
-        chan = mux.next_channel()
-        if not chan:
-            log('warning: too many open channels.  Discarded connection.\n')
-            sock.close()
-            return
-        mux.send(chan, ssnet.CMD_CONNECT, '%s,%s' % dstip)
-        outwrap = MuxWrapper(mux, chan)
-        handlers.append(Proxy(SockWrapper(sock, sock), outwrap))
-    handlers.append(Handler([listener], onaccept))
-
-    dnsreqs = {}
-    def dns_done(chan, data):
-        peer,timeout = dnsreqs.get(chan) or (None,None)
-        debug3('dns_done: channel=%r peer=%r\n' % (chan, peer))
-        if peer:
-            del dnsreqs[chan]
-            debug3('doing sendto %r\n' % (peer,))
-            dnslistener.sendto(data, peer)
-    def ondns():
-        pkt,peer = dnslistener.recvfrom(4096)
-        now = time.time()
-        if pkt:
-            debug1('DNS request from %r: %d bytes\n' % (peer, len(pkt)))
-            chan = mux.next_channel()
-            dnsreqs[chan] = peer,now+30
-            mux.send(chan, ssnet.CMD_DNS_REQ, pkt)
-            mux.channels[chan] = lambda cmd,data: dns_done(chan,data)
-        for chan,(peer,timeout) in dnsreqs.items():
-            if timeout < now:
-                del dnsreqs[chan]
-        debug3('Remaining DNS requests: %d\n' % len(dnsreqs))
-    if dnslistener:
-        handlers.append(Handler([dnslistener], ondns))
-
-    if seed_hosts != None:
-        debug1('seed_hosts: %r\n' % seed_hosts)
-        mux.send(0, ssnet.CMD_HOST_REQ, '\n'.join(seed_hosts))
-    
-    while 1:
-        rv = serverproc.poll()
-        if rv:
-            raise Fatal('server died with error code %d' % rv)
-        
-        ssnet.runonce(handlers, mux)
-        if latency_control:
-            mux.check_fullness()
-        mux.callback()
-
-
-def main(listenip, ssh_cmd, remotename, python, latency_control, dns,
-         seed_hosts, auto_nets,
-         subnets_include, subnets_exclude, syslog, daemon, pidfile):
-    if syslog:
-        ssyslog.start_syslog()
-    if daemon:
-        try:
-            check_daemon(pidfile)
-        except Fatal, e:
-            log("%s\n" % e)
-            return 5
-    debug1('Starting sshuttle proxy.\n')
-    
-    if listenip[1]:
-        ports = [listenip[1]]
-    else:
-        ports = xrange(12300,9000,-1)
-    last_e = None
-    bound = False
-    debug2('Binding:')
-    for port in ports:
-        debug2(' %d' % port)
-        listener = socket.socket()
-        listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        dnslistener = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        dnslistener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        try:
-            listener.bind((listenip[0], port))
-            dnslistener.bind((listenip[0], port))
-            bound = True
-            break
-        except socket.error, e:
-            last_e = e
-    debug2('\n')
-    if not bound:
-        assert(last_e)
-        raise last_e
-    listener.listen(10)
-    listenip = listener.getsockname()
-    debug1('Listening on %r.\n' % (listenip,))
-
-    if dns:
-        dnsip = dnslistener.getsockname()
-        debug1('DNS listening on %r.\n' % (dnsip,))
-        dnsport = dnsip[1]
-    else:
-        dnsport = 0
-        dnslistener = None
-
-    fw = FirewallClient(listenip[1], subnets_include, subnets_exclude, dnsport)
-    
-    try:
-        return _main(listener, fw, ssh_cmd, remotename,
-                     python, latency_control, dnslistener,
-                     seed_hosts, auto_nets, syslog, daemon)
-    finally:
-        try:
-            if daemon:
-                # it's not our child anymore; can't waitpid
-                fw.p.returncode = 0
-            fw.done()
-        finally:
-            if daemon:
-                daemon_cleanup()

default.8.do

@@ -1,7 +0,0 @@
-exec >&2
-if pandoc </dev/null 2>/dev/null; then
-	pandoc -s -r markdown -w man -o $3 $1.md
-else
-	echo "Warning: pandoc not installed; can't generate manpages."
-	redo-always
-fi

do

@@ -1,150 +0,0 @@
-#!/bin/sh
-#
-# A minimal alternative to djb redo that doesn't support incremental builds.
-# For the full version, visit http://github.com/apenwarr/redo
-#
-# The author disclaims copyright to this source file and hereby places it in
-# the public domain. (2010 12 14)
-#
-
-# By default, no output coloring.
-GREEN=""
-BOLD=""
-PLAIN=""
-
-if [ -n "$TERM" -a "$TERM" != "dumb" ] && tty <&2 >/dev/null 2>&1; then
-	GREEN="$(printf '\033[32m')"
-	BOLD="$(printf '\033[1m')"
-	PLAIN="$(printf '\033[m')"
-fi
-
-_dirsplit()
-{
-	base=${1##*/}
-	dir=${1%$base}
-}
-
-_dirsplit "$0"
-export REDO=$(cd "${dir:-.}" && echo "$PWD/$base")
-
-DO_TOP=
-if [ -z "$DO_BUILT" ]; then
-	DO_TOP=1
-	[ -n "$*" ] || set all  # only toplevel redo has a default target
-	export DO_BUILT=$PWD/.do_built
-	: >>"$DO_BUILT"
-	echo "Removing previously built files..." >&2
-	sort -u "$DO_BUILT" | tee "$DO_BUILT.new" |
-	while read f; do printf "%s\0%s.did\0" "$f" "$f"; done |
-	xargs -0 rm -f 2>/dev/null
-	mv "$DO_BUILT.new" "$DO_BUILT"
-	DO_PATH=$DO_BUILT.dir
-	export PATH=$DO_PATH:$PATH
-	rm -rf "$DO_PATH"
-	mkdir "$DO_PATH"
-	for d in redo redo-ifchange; do
-		ln -s "$REDO" "$DO_PATH/$d";
-	done
-	[ -e /bin/true ] && TRUE=/bin/true || TRUE=/usr/bin/true
-	for d in redo-ifcreate redo-stamp redo-always; do 
-		ln -s $TRUE "$DO_PATH/$d";
-	done
-fi
-
-
-_find_dofile_pwd()
-{
-	DOFILE=default.$1.do
-	while :; do
-		DOFILE=default.${DOFILE#default.*.}
-		[ -e "$DOFILE" -o "$DOFILE" = default.do ] && break
-	done
-	EXT=${DOFILE#default}
-	EXT=${EXT%.do}
-	BASE=${1%$EXT}
-}
-
-
-_find_dofile()
-{
-	PREFIX=
-	while :; do
-		_find_dofile_pwd "$1"
-		[ -e "$DOFILE" ] && break
-		[ "$PWD" = "/" ] && break
-		TARGET=${PWD##*/}/$TARGET
-		PREFIX=${PWD##*/}/$PREFIX
-		cd ..
-	done
-	BASE=$PREFIX$BASE
-}
-
-
-_run_dofile()
-{
-	export DO_DEPTH="$DO_DEPTH  "
-	export REDO_TARGET=$PWD/$TARGET
-	set -e
-	read line1 <"$PWD/$DOFILE"
-	cmd=${line1#"#!/"}
-	if [ "$cmd" != "$line1" ]; then
-		/$cmd "$PWD/$DOFILE" "$@" >"$TARGET.tmp2"
-	else
-		. "$PWD/$DOFILE" >"$TARGET.tmp2"
-	fi
-}
-
-
-_do()
-{
-	DIR=$1
-	TARGET=$2
-	if [ ! -e "$TARGET" ] || [ -e "$TARGET/." -a ! -e "$TARGET.did" ]; then
-		printf '%sdo  %s%s%s%s\n' \
-			"$GREEN" "$DO_DEPTH" "$BOLD" "$DIR$TARGET" "$PLAIN" >&2
-		echo "$PWD/$TARGET" >>"$DO_BUILT"
-		DOFILE=$TARGET.do
-		BASE=$TARGET
-		EXT=
-		[ -e "$TARGET.do" ] || _find_dofile "$TARGET"
-		if [ ! -e "$DOFILE" ]; then
-			echo "do: $TARGET: no .do file" >&2
-			return 1
-		fi
-		[ ! -e "$DO_BUILD" ] || : >>"$TARGET.did"
-		( _run_dofile "$BASE" "$EXT" "$TARGET.tmp" )
-		RV=$?
-		if [ $RV != 0 ]; then
-			printf "do: %s%s\n" "$DO_DEPTH" \
-				"$DIR$TARGET: got exit code $RV" >&2
-			rm -f "$TARGET.tmp" "$TARGET.tmp2"
-			return $RV
-		fi
-		mv "$TARGET.tmp" "$TARGET" 2>/dev/null ||
-		! test -s "$TARGET.tmp2" ||
-		mv "$TARGET.tmp2" "$TARGET" 2>/dev/null
-		rm -f "$TARGET.tmp2"
-	else
-		echo "do  $DO_DEPTH$TARGET exists." >&2
-	fi
-}
-
-
-redo()
-{
-	for i in "$@"; do
-		_dirsplit "$i"
-		( cd "$dir" && _do "$dir" "$base" ) || return 1
-	done
-}
-
-
-set -e
-redo "$@"
-
-if [ -n "$DO_TOP" ]; then
-	echo "Removing stamp files..." >&2
-	[ ! -e "$DO_BUILT" ] ||
-	while read f; do printf "%s.did\0" "$f"; done <"$DO_BUILT" |
-	xargs -0 rm -f 2>/dev/null
-fi

docs/Makefile

@@ -0,0 +1,177 @@
+# Makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+PAPER         =
+BUILDDIR      = _build
+
+# User-friendly check for sphinx-build
+ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
+$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from http://sphinx-doc.org/)
+endif
+
+# Internal variables.
+PAPEROPT_a4     = -D latex_paper_size=a4
+PAPEROPT_letter = -D latex_paper_size=letter
+ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+# the i18n builder cannot share the environment and doctrees with the others
+I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+
+.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext
+
+help:
+	@echo "Please use \`make <target>' where <target> is one of"
+	@echo "  html       to make standalone HTML files"
+	@echo "  dirhtml    to make HTML files named index.html in directories"
+	@echo "  singlehtml to make a single large HTML file"
+	@echo "  pickle     to make pickle files"
+	@echo "  json       to make JSON files"
+	@echo "  htmlhelp   to make HTML files and a HTML help project"
+	@echo "  qthelp     to make HTML files and a qthelp project"
+	@echo "  devhelp    to make HTML files and a Devhelp project"
+	@echo "  epub       to make an epub"
+	@echo "  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
+	@echo "  latexpdf   to make LaTeX files and run them through pdflatex"
+	@echo "  latexpdfja to make LaTeX files and run them through platex/dvipdfmx"
+	@echo "  text       to make text files"
+	@echo "  man        to make manual pages"
+	@echo "  texinfo    to make Texinfo files"
+	@echo "  info       to make Texinfo files and run them through makeinfo"
+	@echo "  gettext    to make PO message catalogs"
+	@echo "  changes    to make an overview of all changed/added/deprecated items"
+	@echo "  xml        to make Docutils-native XML files"
+	@echo "  pseudoxml  to make pseudoxml-XML files for display purposes"
+	@echo "  linkcheck  to check all external links for integrity"
+	@echo "  doctest    to run all doctests embedded in the documentation (if enabled)"
+
+clean:
+	rm -rf $(BUILDDIR)/*
+
+html:
+	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
+	@echo
+	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
+
+dirhtml:
+	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
+	@echo
+	@echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml."
+
+singlehtml:
+	$(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
+	@echo
+	@echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml."
+
+pickle:
+	$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
+	@echo
+	@echo "Build finished; now you can process the pickle files."
+
+json:
+	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
+	@echo
+	@echo "Build finished; now you can process the JSON files."
+
+htmlhelp:
+	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
+	@echo
+	@echo "Build finished; now you can run HTML Help Workshop with the" \
+	      ".hhp project file in $(BUILDDIR)/htmlhelp."
+
+qthelp:
+	$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
+	@echo
+	@echo "Build finished; now you can run "qcollectiongenerator" with the" \
+	      ".qhcp project file in $(BUILDDIR)/qthelp, like this:"
+	@echo "# qcollectiongenerator $(BUILDDIR)/qthelp/sshuttle.qhcp"
+	@echo "To view the help file:"
+	@echo "# assistant -collectionFile $(BUILDDIR)/qthelp/sshuttle.qhc"
+
+devhelp:
+	$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
+	@echo
+	@echo "Build finished."
+	@echo "To view the help file:"
+	@echo "# mkdir -p $$HOME/.local/share/devhelp/sshuttle"
+	@echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/sshuttle"
+	@echo "# devhelp"
+
+epub:
+	$(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
+	@echo
+	@echo "Build finished. The epub file is in $(BUILDDIR)/epub."
+
+latex:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo
+	@echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex."
+	@echo "Run \`make' in that directory to run these through (pdf)latex" \
+	      "(use \`make latexpdf' here to do that automatically)."
+
+latexpdf:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo "Running LaTeX files through pdflatex..."
+	$(MAKE) -C $(BUILDDIR)/latex all-pdf
+	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
+
+latexpdfja:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo "Running LaTeX files through platex and dvipdfmx..."
+	$(MAKE) -C $(BUILDDIR)/latex all-pdf-ja
+	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
+
+text:
+	$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
+	@echo
+	@echo "Build finished. The text files are in $(BUILDDIR)/text."
+
+man:
+	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
+	@echo
+	@echo "Build finished. The manual pages are in $(BUILDDIR)/man."
+
+texinfo:
+	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
+	@echo
+	@echo "Build finished. The Texinfo files are in $(BUILDDIR)/texinfo."
+	@echo "Run \`make' in that directory to run these through makeinfo" \
+	      "(use \`make info' here to do that automatically)."
+
+info:
+	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
+	@echo "Running Texinfo files through makeinfo..."
+	make -C $(BUILDDIR)/texinfo info
+	@echo "makeinfo finished; the Info files are in $(BUILDDIR)/texinfo."
+
+gettext:
+	$(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale
+	@echo
+	@echo "Build finished. The message catalogs are in $(BUILDDIR)/locale."
+
+changes:
+	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
+	@echo
+	@echo "The overview file is in $(BUILDDIR)/changes."
+
+linkcheck:
+	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
+	@echo
+	@echo "Link check complete; look for any errors in the above output " \
+	      "or in $(BUILDDIR)/linkcheck/output.txt."
+
+doctest:
+	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
+	@echo "Testing of doctests in the sources finished, look at the " \
+	      "results in $(BUILDDIR)/doctest/output.txt."
+
+xml:
+	$(SPHINXBUILD) -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml
+	@echo
+	@echo "Build finished. The XML files are in $(BUILDDIR)/xml."
+
+pseudoxml:
+	$(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
+	@echo
+	@echo "Build finished. The pseudo-XML files are in $(BUILDDIR)/pseudoxml."

docs/changes.rst

@@ -0,0 +1,4 @@
+Changelog
+---------
+
+.. include:: ../CHANGES.rst

docs/conf.py

@@ -0,0 +1,260 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# sshuttle documentation build configuration file, created by
+# sphinx-quickstart on Sun Jan 17 12:13:47 2016.
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+# import sys
+# import os
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+# sys.path.insert(0, os.path.abspath('.'))
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'sphinx.ext.todo',
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix of source filenames.
+source_suffix = '.rst'
+
+# The encoding of source files.
+# source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = 'sshuttle'
+copyright = '2016, Brian May'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+from setuptools_scm import get_version
+version = get_version(root="..")
+# The full version, including alpha/beta/rc tags.
+release = version
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+# language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+# today = ''
+# Else, today_fmt is used as the format for a strftime call.
+# today_fmt = '%B %d, %Y'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+exclude_patterns = ['_build']
+
+# The reST default role (used for this markup: `text`) to use for all
+# documents.
+# default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+# add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+# add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+# show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# A list of ignored prefixes for module index sorting.
+# modindex_common_prefix = []
+
+# If true, keep warnings as "system message" paragraphs in the built documents.
+# keep_warnings = False
+
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+html_theme = 'default'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+# html_theme_options = {}
+
+# Add any paths that contain custom themes here, relative to this directory.
+# html_theme_path = []
+
+# The name for this set of Sphinx documents.  If None, it defaults to
+# "<project> v<release> documentation".
+# html_title = None
+
+# A shorter title for the navigation bar.  Default is the same as html_title.
+# html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+# html_logo = None
+
+# The name of an image file (within the static path) to use as favicon of the
+# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+# html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Add any extra paths that contain custom files (such as robots.txt or
+# .htaccess) here, relative to this directory. These files are copied
+# directly to the root of the documentation.
+# html_extra_path = []
+
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+# html_last_updated_fmt = '%b %d, %Y'
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+# html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+# html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+# html_additional_pages = {}
+
+# If false, no module index is generated.
+# html_domain_indices = True
+
+# If false, no index is generated.
+# html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+# html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+# html_show_sourcelink = True
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+# html_show_sphinx = True
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+# html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it.  The value of this option must be the
+# base URL from which the finished HTML is served.
+# html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+# html_file_suffix = None
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'sshuttledoc'
+
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    # 'papersize': 'letterpaper',
+
+    # The font size ('10pt', '11pt' or '12pt').
+    # 'pointsize': '10pt',
+
+    # Additional stuff for the LaTeX preamble.
+    # 'preamble': '',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    ('index', 'sshuttle.tex', 'sshuttle documentation', 'Brian May', 'manual'),
+]
+
+# The name of an image file (relative to this directory) to place at the top of
+# the title page.
+# latex_logo = None
+
+# For "manual" documents, if this is true, then toplevel headings are parts,
+# not chapters.
+# latex_use_parts = False
+
+# If true, show page references after internal links.
+# latex_show_pagerefs = False
+
+# If true, show URL addresses after external links.
+# latex_show_urls = False
+
+# Documents to append as an appendix to all manuals.
+# latex_appendices = []
+
+# If false, no module index is generated.
+# latex_domain_indices = True
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    ('manpage', 'sshuttle', 'sshuttle documentation', ['Brian May'], 1)
+]
+
+# If true, show URL addresses after external links.
+# man_show_urls = False
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    ('index', 'sshuttle', 'sshuttle documentation',
+     'Brian May', 'sshuttle', 'A transparent proxy-based VPN using ssh',
+     'Miscellaneous'),
+]
+
+# Documents to append as an appendix to all manuals.
+# texinfo_appendices = []
+
+# If false, no module index is generated.
+# texinfo_domain_indices = True
+
+# How to display URL addresses: 'footnote', 'no', or 'inline'.
+# texinfo_show_urls = 'footnote'
+
+# If true, do not generate a @detailmenu in the "Top" node's menu.
+# texinfo_no_detailmenu = False

docs/how-it-works.rst

@@ -0,0 +1,37 @@
+How it works
+============
+sshuttle is not exactly a VPN, and not exactly port forwarding.  It's kind
+of both, and kind of neither.
+
+It's like a VPN, since it can forward every port on an entire network, not
+just ports you specify.  Conveniently, it lets you use the "real" IP
+addresses of each host rather than faking port numbers on localhost.
+
+On the other hand, the way it *works* is more like ssh port forwarding than
+a VPN.  Normally, a VPN forwards your data one packet at a time, and
+doesn't care about individual connections; ie. it's "stateless" with respect
+to the traffic.  sshuttle is the opposite of stateless; it tracks every
+single connection.
+
+You could compare sshuttle to something like the old `Slirp
+<http://en.wikipedia.org/wiki/Slirp>`_ program, which was a userspace TCP/IP
+implementation that did something similar.  But it operated on a
+packet-by-packet basis on the client side, reassembling the packets on the
+server side.  That worked okay back in the "real live serial port" days,
+because serial ports had predictable latency and buffering.
+
+But you can't safely just forward TCP packets over a TCP session (like ssh),
+because TCP's performance depends fundamentally on packet loss; it
+*must* experience packet loss in order to know when to slow down!  At
+the same time, the outer TCP session (ssh, in this case) is a reliable
+transport, which means that what you forward through the tunnel *never*
+experiences packet loss.  The ssh session itself experiences packet loss, of
+course, but TCP fixes it up and ssh (and thus you) never know the
+difference.  But neither does your inner TCP session, and extremely screwy
+performance ensues.
+
+sshuttle assembles the TCP stream locally, multiplexes it statefully over
+an ssh session, and disassembles it back into packets at the other end.  So
+it never ends up doing TCP-over-TCP.  It's just data-over-TCP, which is
+safe.
+

docs/index.rst

@@ -0,0 +1,29 @@
+sshuttle: where transparent proxy meets VPN meets ssh
+=====================================================
+
+:Date: |today|
+:Version: |version|
+
+Contents:
+
+.. toctree::
+   :maxdepth: 2
+
+   overview
+   requirements
+   installation
+   usage
+   platform
+   Man Page <manpage>
+   how-it-works
+   support
+   trivia
+   changes
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`search`
+

docs/installation.rst

@@ -0,0 +1,11 @@
+Installation
+============
+
+- From PyPI::
+
+      pip install sshuttle
+
+- Clone::
+
+      git clone https://github.com/sshuttle/sshuttle.git
+      ./setup.py install

docs/make.bat

@@ -0,0 +1,242 @@
+@ECHO OFF
+
+REM Command file for Sphinx documentation
+
+if "%SPHINXBUILD%" == "" (
+	set SPHINXBUILD=sphinx-build
+)
+set BUILDDIR=_build
+set ALLSPHINXOPTS=-d %BUILDDIR%/doctrees %SPHINXOPTS% .
+set I18NSPHINXOPTS=%SPHINXOPTS% .
+if NOT "%PAPER%" == "" (
+	set ALLSPHINXOPTS=-D latex_paper_size=%PAPER% %ALLSPHINXOPTS%
+	set I18NSPHINXOPTS=-D latex_paper_size=%PAPER% %I18NSPHINXOPTS%
+)
+
+if "%1" == "" goto help
+
+if "%1" == "help" (
+	:help
+	echo.Please use `make ^<target^>` where ^<target^> is one of
+	echo.  html       to make standalone HTML files
+	echo.  dirhtml    to make HTML files named index.html in directories
+	echo.  singlehtml to make a single large HTML file
+	echo.  pickle     to make pickle files
+	echo.  json       to make JSON files
+	echo.  htmlhelp   to make HTML files and a HTML help project
+	echo.  qthelp     to make HTML files and a qthelp project
+	echo.  devhelp    to make HTML files and a Devhelp project
+	echo.  epub       to make an epub
+	echo.  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter
+	echo.  text       to make text files
+	echo.  man        to make manual pages
+	echo.  texinfo    to make Texinfo files
+	echo.  gettext    to make PO message catalogs
+	echo.  changes    to make an overview over all changed/added/deprecated items
+	echo.  xml        to make Docutils-native XML files
+	echo.  pseudoxml  to make pseudoxml-XML files for display purposes
+	echo.  linkcheck  to check all external links for integrity
+	echo.  doctest    to run all doctests embedded in the documentation if enabled
+	goto end
+)
+
+if "%1" == "clean" (
+	for /d %%i in (%BUILDDIR%\*) do rmdir /q /s %%i
+	del /q /s %BUILDDIR%\*
+	goto end
+)
+
+
+%SPHINXBUILD% 2> nul
+if errorlevel 9009 (
+	echo.
+	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+	echo.installed, then set the SPHINXBUILD environment variable to point
+	echo.to the full path of the 'sphinx-build' executable. Alternatively you
+	echo.may add the Sphinx directory to PATH.
+	echo.
+	echo.If you don't have Sphinx installed, grab it from
+	echo.http://sphinx-doc.org/
+	exit /b 1
+)
+
+if "%1" == "html" (
+	%SPHINXBUILD% -b html %ALLSPHINXOPTS% %BUILDDIR%/html
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The HTML pages are in %BUILDDIR%/html.
+	goto end
+)
+
+if "%1" == "dirhtml" (
+	%SPHINXBUILD% -b dirhtml %ALLSPHINXOPTS% %BUILDDIR%/dirhtml
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The HTML pages are in %BUILDDIR%/dirhtml.
+	goto end
+)
+
+if "%1" == "singlehtml" (
+	%SPHINXBUILD% -b singlehtml %ALLSPHINXOPTS% %BUILDDIR%/singlehtml
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The HTML pages are in %BUILDDIR%/singlehtml.
+	goto end
+)
+
+if "%1" == "pickle" (
+	%SPHINXBUILD% -b pickle %ALLSPHINXOPTS% %BUILDDIR%/pickle
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; now you can process the pickle files.
+	goto end
+)
+
+if "%1" == "json" (
+	%SPHINXBUILD% -b json %ALLSPHINXOPTS% %BUILDDIR%/json
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; now you can process the JSON files.
+	goto end
+)
+
+if "%1" == "htmlhelp" (
+	%SPHINXBUILD% -b htmlhelp %ALLSPHINXOPTS% %BUILDDIR%/htmlhelp
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; now you can run HTML Help Workshop with the ^
+.hhp project file in %BUILDDIR%/htmlhelp.
+	goto end
+)
+
+if "%1" == "qthelp" (
+	%SPHINXBUILD% -b qthelp %ALLSPHINXOPTS% %BUILDDIR%/qthelp
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; now you can run "qcollectiongenerator" with the ^
+.qhcp project file in %BUILDDIR%/qthelp, like this:
+	echo.^> qcollectiongenerator %BUILDDIR%\qthelp\sshuttle.qhcp
+	echo.To view the help file:
+	echo.^> assistant -collectionFile %BUILDDIR%\qthelp\sshuttle.ghc
+	goto end
+)
+
+if "%1" == "devhelp" (
+	%SPHINXBUILD% -b devhelp %ALLSPHINXOPTS% %BUILDDIR%/devhelp
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished.
+	goto end
+)
+
+if "%1" == "epub" (
+	%SPHINXBUILD% -b epub %ALLSPHINXOPTS% %BUILDDIR%/epub
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The epub file is in %BUILDDIR%/epub.
+	goto end
+)
+
+if "%1" == "latex" (
+	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; the LaTeX files are in %BUILDDIR%/latex.
+	goto end
+)
+
+if "%1" == "latexpdf" (
+	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
+	cd %BUILDDIR%/latex
+	make all-pdf
+	cd %BUILDDIR%/..
+	echo.
+	echo.Build finished; the PDF files are in %BUILDDIR%/latex.
+	goto end
+)
+
+if "%1" == "latexpdfja" (
+	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
+	cd %BUILDDIR%/latex
+	make all-pdf-ja
+	cd %BUILDDIR%/..
+	echo.
+	echo.Build finished; the PDF files are in %BUILDDIR%/latex.
+	goto end
+)
+
+if "%1" == "text" (
+	%SPHINXBUILD% -b text %ALLSPHINXOPTS% %BUILDDIR%/text
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The text files are in %BUILDDIR%/text.
+	goto end
+)
+
+if "%1" == "man" (
+	%SPHINXBUILD% -b man %ALLSPHINXOPTS% %BUILDDIR%/man
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The manual pages are in %BUILDDIR%/man.
+	goto end
+)
+
+if "%1" == "texinfo" (
+	%SPHINXBUILD% -b texinfo %ALLSPHINXOPTS% %BUILDDIR%/texinfo
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The Texinfo files are in %BUILDDIR%/texinfo.
+	goto end
+)
+
+if "%1" == "gettext" (
+	%SPHINXBUILD% -b gettext %I18NSPHINXOPTS% %BUILDDIR%/locale
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The message catalogs are in %BUILDDIR%/locale.
+	goto end
+)
+
+if "%1" == "changes" (
+	%SPHINXBUILD% -b changes %ALLSPHINXOPTS% %BUILDDIR%/changes
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.The overview file is in %BUILDDIR%/changes.
+	goto end
+)
+
+if "%1" == "linkcheck" (
+	%SPHINXBUILD% -b linkcheck %ALLSPHINXOPTS% %BUILDDIR%/linkcheck
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Link check complete; look for any errors in the above output ^
+or in %BUILDDIR%/linkcheck/output.txt.
+	goto end
+)
+
+if "%1" == "doctest" (
+	%SPHINXBUILD% -b doctest %ALLSPHINXOPTS% %BUILDDIR%/doctest
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Testing of doctests in the sources finished, look at the ^
+results in %BUILDDIR%/doctest/output.txt.
+	goto end
+)
+
+if "%1" == "xml" (
+	%SPHINXBUILD% -b xml %ALLSPHINXOPTS% %BUILDDIR%/xml
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The XML files are in %BUILDDIR%/xml.
+	goto end
+)
+
+if "%1" == "pseudoxml" (
+	%SPHINXBUILD% -b pseudoxml %ALLSPHINXOPTS% %BUILDDIR%/pseudoxml
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The pseudo-XML files are in %BUILDDIR%/pseudoxml.
+	goto end
+)
+
+:end

docs/manpage.rst

@@ -1,174 +1,206 @@
-% sshuttle(8) Sshuttle 0.46
-% Avery Pennarun <apenwarr@gmail.com>
-% 2011-01-25
-
-# NAME
-
-sshuttle - a transparent proxy-based VPN using ssh
-
-# SYNOPSIS
-
-sshuttle [options...] [-r [username@]sshserver[:port]] \<subnets...\>
+sshuttle
+========
 
 
-# DESCRIPTION
+Synopsis
+--------
+**sshuttle** [*options*] [**-r** *[username@]sshserver[:port]*] \<*subnets* ...\>
 
-sshuttle allows you to create a VPN connection from your
+
+Description
+-----------
+:program:`sshuttle` allows you to create a VPN connection from your
 machine to any remote server that you can connect to via
 ssh, as long as that server has python 2.3 or higher.
 
 To work, you must have root access on the local machine,
 but you can have a normal account on the server.
 
-It's valid to run sshuttle more than once simultaneously on
+It's valid to run :program:`sshuttle` more than once simultaneously on
 a single client machine, connecting to a different server
 every time, so you can be on more than one VPN at once.
 
-If run on a router, sshuttle can forward traffic for your
+If run on a router, :program:`sshuttle` can forward traffic for your
 entire subnet to the VPN.
 
 
-# OPTIONS
+Options
+-------
+.. program:: sshuttle
 
-\<subnets...\>
-:   a list of subnets to route over the VPN, in the form
-    `a.b.c.d[/width]`.  Valid examples are 1.2.3.4 (a
+.. option:: subnets
+
+    A list of subnets to route over the VPN, in the form
+    ``a.b.c.d[/width]``.  Valid examples are 1.2.3.4 (a
     single IP address), 1.2.3.4/32 (equivalent to 1.2.3.4),
     1.2.3.0/24 (a 24-bit subnet, ie. with a 255.255.255.0
     netmask), and 0/0 ('just route everything through the
     VPN').
 
--l, --listen=*[ip:]port*
-:   use this ip address and port number as the transparent
-    proxy port.  By default sshuttle finds an available
+.. option:: --method [auto|nat|tproxy|pf]
+
+   Which firewall method should sshuttle use? For auto, sshuttle attempts to
+   guess the appropriate method depending on what it can find in PATH. The
+   default value is auto.
+
+.. option:: -l, --listen=[ip:]port
+
+    Use this ip address and port number as the transparent
+    proxy port.  By default :program:`sshuttle` finds an available
     port automatically and listens on IP 127.0.0.1
     (localhost), so you don't need to override it, and
     connections are only proxied from the local machine,
     not from outside machines.  If you want to accept
     connections from other machines on your network (ie. to
-    run sshuttle on a router) try enabling IP Forwarding in
-    your kernel, then using `--listen 0.0.0.0:0`. 
+    run :program:`sshuttle` on a router) try enabling IP Forwarding in
+    your kernel, then using ``--listen 0.0.0.0:0``.
 
--H, --auto-hosts
-:   scan for remote hostnames and update the local /etc/hosts
+    For the tproxy method this can be an IPv6 address. Use this option twice if
+    required, to provide both IPv4 and IPv6 addresses.
+
+.. option:: -H, --auto-hosts
+
+    Scan for remote hostnames and update the local /etc/hosts
     file with matching entries for as long as the VPN is
     open.  This is nicer than changing your system's DNS
     (/etc/resolv.conf) settings, for several reasons.  First,
     hostnames are added without domain names attached, so
-    you can `ssh thatserver` without worrying if your local
-    domain matches the remote one.  Second, if you sshuttle
+    you can ``ssh thatserver`` without worrying if your local
+    domain matches the remote one.  Second, if you :program:`sshuttle`
     into more than one VPN at a time, it's impossible to
     use more than one DNS server at once anyway, but
-    sshuttle correctly merges /etc/hosts entries between
+    :program:`sshuttle` correctly merges /etc/hosts entries between
     all running copies.  Third, if you're only routing a
     few subnets over the VPN, you probably would prefer to
     keep using your local DNS server for everything else.
-    
--N, --auto-nets
-:   in addition to the subnets provided on the command
+
+.. option:: -N, --auto-nets
+
+    In addition to the subnets provided on the command
     line, ask the server which subnets it thinks we should
     route, and route those automatically.  The suggestions
     are taken automatically from the server's routing
     table.
-    
---python
-:   specify the name/path of the remote python interpreter. 
-    The default is just `python`, which means to use the
+
+.. option:: --dns
+
+    Capture local DNS requests and forward to the remote DNS
+    server.
+
+.. option:: --python
+
+    Specify the name/path of the remote python interpreter.
+    The default is just ``python``, which means to use the
     default python interpreter on the remote system's PATH.
 
--r, --remote=*[username@]sshserver[:port]*
-:   the remote hostname and optional username and ssh
-    port number to use for connecting to the remote server. 
+.. option:: -r, --remote=[username@]sshserver[:port]
+
+    The remote hostname and optional username and ssh
+    port number to use for connecting to the remote server.
     For example, example.com, testuser@example.com,
     testuser@example.com:2222, or example.com:2244.
 
--x, --exclude=*subnet*
-:   explicitly exclude this subnet from forwarding.  The
-    format of this option is the same as the `<subnets>`
+.. option:: -x, --exclude=subnet
+
+    Explicitly exclude this subnet from forwarding.  The
+    format of this option is the same as the ``<subnets>``
     option.  To exclude more than one subnet, specify the
-    `-x` option more than once.  You can say something like
-    `0/0 -x 1.2.3.0/24` to forward everything except the
+    ``-x`` option more than once.  You can say something like
+    ``0/0 -x 1.2.3.0/24`` to forward everything except the
     local subnet over the VPN, for example.
 
--v, --verbose
-:   print more information about the session.  This option
-    can be used more than once for increased verbosity.  By
-    default, sshuttle prints only error messages.
-    
--e, --ssh-cmd
-:   the command to use to connect to the remote server. The
-    default is just `ssh`.  Use this if your ssh client is
-    in a non-standard location or you want to provide extra
-    options to the ssh command, for example, `-e 'ssh -v'`.
+.. option:: -X, --exclude-from=file
 
---seed-hosts
-:   a comma-separated list of hostnames to use to
-    initialize the `--auto-hosts` scan algorithm. 
-    `--auto-hosts` does things like poll local SMB servers
+    Exclude the subnets specified in a file, one subnet per
+    line. Useful when you have lots of subnets to exclude.
+
+.. option:: -v, --verbose
+
+    Print more information about the session.  This option
+    can be used more than once for increased verbosity.  By
+    default, :program:`sshuttle` prints only error messages.
+
+.. option:: -e, --ssh-cmd
+
+    The command to use to connect to the remote server. The
+    default is just ``ssh``.  Use this if your ssh client is
+    in a non-standard location or you want to provide extra
+    options to the ssh command, for example, ``-e 'ssh -v'``.
+
+.. option:: --seed-hosts
+
+    A comma-separated list of hostnames to use to
+    initialize the :option:`--auto-hosts` scan algorithm.
+    :option:`--auto-hosts` does things like poll local SMB servers
     for lists of local hostnames, but can speed things up
     if you use this option to give it a few names to start
     from.
-    
---no-latency-control
-:   sacrifice latency to improve bandwidth benchmarks. ssh
+
+.. option:: --no-latency-control
+
+    Sacrifice latency to improve bandwidth benchmarks. ssh
     uses really big socket buffers, which can overload the
     connection if you start doing large file transfers,
     thus making all your other sessions inside the same
-    tunnel go slowly. Normally, sshuttle tries to avoid
+    tunnel go slowly. Normally, :program:`sshuttle` tries to avoid
     this problem using a "fullness check" that allows only
     a certain amount of outstanding data to be buffered at
     a time.  But on high-bandwidth links, this can leave a
     lot of your bandwidth underutilized.  It also makes
-    sshuttle seem slow in bandwidth benchmarks (benchmarks
-    rarely test ping latency, which is what sshuttle is
+    :program:`sshuttle` seem slow in bandwidth benchmarks (benchmarks
+    rarely test ping latency, which is what :program:`sshuttle` is
     trying to control).  This option disables the latency
     control feature, maximizing bandwidth usage.  Use at
     your own risk.
-    
--D, --daemon
-:   automatically fork into the background after connecting
-    to the remote server.  Implies `--syslog`.
-    
---syslog
-:   after connecting, send all log messages to the
-    `syslog`(3) service instead of stderr.  This is
-    implicit if you use `--daemon`.
-    
---pidfile=*pidfilename*
-:   when using `--daemon`, save sshuttle's pid to
-    *pidfilename*.  The default is `sshuttle.pid` in the
+
+.. option:: -D, --daemon
+
+    Automatically fork into the background after connecting
+    to the remote server.  Implies :option:`--syslog`.
+
+.. option:: --syslog
+
+    after connecting, send all log messages to the
+    :manpage:`syslog(3)` service instead of stderr.  This is
+    implicit if you use :option:`--daemon`.
+
+.. option:: --pidfile=pidfilename
+
+    when using :option:`--daemon`, save :program:`sshuttle`'s pid to
+    *pidfilename*.  The default is ``sshuttle.pid`` in the
     current directory.
 
---server
-:   (internal use only) run the sshuttle server on
-    stdin/stdout.  This is what the client runs on
-    the remote end.
+.. option:: --disable-ipv6
 
---firewall
-:   (internal use only) run the firewall manager.  This is
-    the only part of sshuttle that must run as root.  If
-    you start sshuttle as a non-root user, it will
-    automatically run `sudo` or `su` to start the firewall
-    manager, but the core of sshuttle still runs as a
+    If using the tproxy method, this will disable IPv6 support.
+
+.. option:: --firewall
+
+    (internal use only) run the firewall manager.  This is
+    the only part of :program:`sshuttle` that must run as root.  If
+    you start :program:`sshuttle` as a non-root user, it will
+    automatically run ``sudo`` or ``su`` to start the firewall
+    manager, but the core of :program:`sshuttle` still runs as a
     normal user.
-    
---hostwatch
-:   (internal use only) run the hostwatch daemon.  This
+
+.. option:: --hostwatch
+
+    (internal use only) run the hostwatch daemon.  This
     process runs on the server side and collects hostnames for
-    the `--auto-hosts` option.  Using this option by itself
-    makes it a lot easier to debug and test the `--auto-hosts`
+    the :option:`--auto-hosts` option.  Using this option by itself
+    makes it a lot easier to debug and test the :option:`--auto-hosts`
     feature.
 
 
-# EXAMPLES
-
-Test locally by proxying all local connections, without using ssh:
+Examples
+--------
+Test locally by proxying all local connections, without using ssh::
 
     $ sshuttle -v 0/0
 
     Starting sshuttle proxy.
     Listening on ('0.0.0.0', 12300).
-    [local sudo] Password: 
+    [local sudo] Password:
     firewall manager ready.
     c : connecting to server...
      s: available routes:
@@ -186,7 +218,7 @@ Test locally by proxying all local connections, without using ssh:
     c : SW#6:192.168.42.106:50035: deleting
 
 Test connection to a remote server, with automatic hostname
-and subnet guessing:
+and subnet guessing::
 
     $ sshuttle -vNHr example.org
 
@@ -209,22 +241,22 @@ and subnet guessing:
     c : SW#6:192.168.42.121:60554: deleting
 
 
-# DISCUSSION
-
-When it starts, sshuttle creates an ssh session to the
-server specified by the `-r` option.  If `-r` is omitted,
+Discussion
+----------
+When it starts, :program:`sshuttle` creates an ssh session to the
+server specified by the ``-r`` option.  If ``-r`` is omitted,
 it will start both its client and server locally, which is
 sometimes useful for testing.
 
-After connecting to the remote server, sshuttle uploads its
+After connecting to the remote server, :program:`sshuttle` uploads its
 (python) source code to the remote end and executes it
-there.  Thus, you don't need to install sshuttle on the
-remote server, and there are never sshuttle version
+there.  Thus, you don't need to install :program:`sshuttle` on the
+remote server, and there are never :program:`sshuttle` version
 conflicts between client and server.
 
-Unlike most VPNs, sshuttle forwards sessions, not packets. 
+Unlike most VPNs, :program:`sshuttle` forwards sessions, not packets.
 That is, it uses kernel transparent proxying (`iptables
-REDIRECT` rules on Linux, or `ipfw fwd` rules on BSD) to
+REDIRECT` rules on Linux) to
 capture outgoing TCP sessions, then creates entirely
 separate TCP sessions out to the original destination at
 the other end of the tunnel.
@@ -243,7 +275,7 @@ tcp-based encrypted streams like ssh or ssl, and have to
 implement their own encryption from scratch, which is very
 complex and error prone.
 
-sshuttle's simplicity comes from the fact that it can
+:program:`sshuttle`'s simplicity comes from the fact that it can
 safely use the existing ssh encrypted tunnel without
 incurring a performance penalty.  It does this by letting
 the client-side kernel manage the incoming tcp stream, and
@@ -252,19 +284,6 @@ there is no need for congestion control to be shared
 between the two separate streams, so a tcp-based tunnel is
 fine.
 
+.. seealso::
 
-# BUGS
-
-On MacOS 10.6 (at least up to 10.6.6), your network will
-stop responding about 10 minutes after the first time you
-start sshuttle, because of a MacOS kernel bug relating to
-arp and the net.inet.ip.scopedroute sysctl.  To fix it,
-just switch your wireless off and on. Sshuttle makes the
-kernel setting it changes permanent, so this won't happen
-again, even after a reboot.
-
-
-# SEE ALSO
-
-`ssh`(1), `python`(1)
-
+   :manpage:`ssh(1)`, :manpage:`python(1)`

docs/overview.rst

@@ -0,0 +1,26 @@
+Overview
+========
+
+As far as I know, sshuttle is the only program that solves the following
+common case:
+
+- Your client machine (or router) is Linux, FreeBSD, or MacOS.
+
+- You have access to a remote network via ssh.
+
+- You don't necessarily have admin access on the remote network.
+
+- The remote network has no VPN, or only stupid/complex VPN
+  protocols (IPsec, PPTP, etc). Or maybe you *are* the
+  admin and you just got frustrated with the awful state of
+  VPN tools.
+
+- You don't want to create an ssh port forward for every
+  single host/port on the remote network.
+
+- You hate openssh's port forwarding because it's randomly
+  slow and/or stupid.
+
+- You can't use openssh's PermitTunnel feature because
+  it's disabled by default on openssh servers; plus it does
+  TCP-over-TCP, which has terrible performance (see below).

docs/platform.rst

@@ -0,0 +1,10 @@
+Platform Specific Notes
+=======================
+
+Contents:
+
+.. toctree::
+   :maxdepth: 2
+
+   tproxy
+   windows

docs/requirements.rst

@@ -0,0 +1,72 @@
+Requirements
+============
+
+Client side Requirements
+------------------------
+
+- sudo, or root access on your client machine.
+  (The server doesn't need admin access.)
+- Python 2.7 or Python 3.5.
+
+
+Linux with NAT method
+~~~~~~~~~~~~~~~~~~~~~
+Supports:
+
+* IPv4 TCP
+* IPv4 DNS
+
+Requires:
+
+* iptables DNAT, REDIRECT, and ttl modules.
+
+
+Linux with TPROXY method
+~~~~~~~~~~~~~~~~~~~~~~~~
+Supports:
+
+* IPv4 TCP
+* IPv4 UDP (requires ``recmsg`` - see below)
+* IPv6 DNS (requires ``recmsg`` - see below)
+* IPv6 TCP
+* IPv6 UDP (requires ``recmsg`` - see below)
+* IPv6 DNS (requires ``recmsg`` - see below)
+
+.. _PyXAPI: http://www.pps.univ-paris-diderot.fr/~ylg/PyXAPI/
+
+Full UDP or DNS support with the TPROXY method requires the ``recvmsg()``
+syscall. This is not available in Python 2, however is in Python 3.5 and
+later. Under Python 2 you might find it sufficient installing PyXAPI_ to get
+the ``recvmsg()`` function. See :doc:`tproxy` for more information.
+
+
+MacOS / FreeBSD / OpenBSD
+~~~~~~~~~~~~~~~~~~~~~~~~~
+Method: pf
+
+Supports:
+
+* IPv4 TCP
+* IPv4 DNS
+
+Requires:
+
+* You need to have the pfctl command.
+
+Windows
+~~~~~~~
+
+Not officially supported, however can be made to work with Vagrant. Requires
+cmd.exe with Administrator access. See :doc:`windows` for more information.
+
+
+Server side Requirements
+------------------------
+Python 2.7 or Python 3.5.
+
+
+Additional Suggested Software
+-----------------------------
+
+- You may want to use autossh, available in various package management
+  systems

docs/support.rst

@@ -0,0 +1,11 @@
+Support
+=======
+
+Mailing list:
+
+* Subscribe by sending a message to <sshuttle+subscribe@googlegroups.com>
+* List archives are at: http://groups.google.com/group/sshuttle
+
+Issue tracker and pull requests at github:
+
+* https://github.com/sshuttle/sshuttle

docs/tproxy.rst

@@ -0,0 +1,42 @@
+TPROXY
+======
+TPROXY is the only method that has full support of IPv6 and UDP.
+
+There are some things you need to consider for TPROXY to work:
+
+- The following commands need to be run first as root. This only needs to be
+  done once after booting up::
+
+      ip route add local default dev lo table 100
+      ip rule add fwmark 1 lookup 100
+      ip -6 route add local default dev lo table 100
+      ip -6 rule add fwmark 1 lookup 100
+
+- The ``--auto-nets`` feature does not detect IPv6 routes automatically. Add IPv6
+  routes manually. e.g. by adding ``'::/0'`` to the end of the command line.
+
+- The client needs to be run as root. e.g.::
+
+      sudo SSH_AUTH_SOCK="$SSH_AUTH_SOCK" $HOME/tree/sshuttle.tproxy/sshuttle  --method=tproxy ...
+
+- You may need to exclude the IP address of the server you are connecting to.
+  Otherwise sshuttle may attempt to intercept the ssh packets, which will not
+  work. Use the ``--exclude`` parameter for this.
+
+- Similarly, UDP return packets (including DNS) could get intercepted and
+  bounced back. This is the case if you have a broad subnet such as
+  ``0.0.0.0/0`` or ``::/0`` that includes the IP address of the client. Use the
+  ``--exclude`` parameter for this.
+
+- You need the ``--method=tproxy`` parameter, as above.
+
+- The routes for the outgoing packets must already exist. For example, if your
+  connection does not have IPv6 support, no IPv6 routes will exist, IPv6
+  packets will not be generated and sshuttle cannot intercept them::
+
+      telnet -6 www.google.com 80
+      Trying 2404:6800:4001:805::1010...
+      telnet: Unable to connect to remote host: Network is unreachable
+
+  Add some dummy routes to external interfaces. Make sure they get removed
+  however after sshuttle exits.

docs/trivia.rst

@@ -0,0 +1,36 @@
+Useless Trivia
+==============
+This section written by the original author, Avery Pennarun
+<apenwarr@gmail.com>.
+
+Back in 1998, I released the first version of `Tunnel
+Vision <http://alumnit.ca/wiki/?TunnelVisionReadMe>`_, a semi-intelligent VPN
+client for Linux.  Unfortunately, I made two big mistakes: I implemented the
+key exchange myself (oops), and I ended up doing TCP-over-TCP (double oops).
+The resulting program worked okay - and people used it for years - but the
+performance was always a bit funny.  And nobody ever found any security flaws
+in my key exchange, either, but that doesn't mean anything. :)
+
+The same year, dcoombs and I also released Fast Forward, a proxy server
+supporting transparent proxying.  Among other things, we used it for
+automatically splitting traffic across more than one Internet connection (a
+tool we called "Double Vision").
+
+I was still in university at the time.  A couple years after that, one of my
+professors was working with some graduate students on the technology that would
+eventually become `Slipstream Internet Acceleration
+<http://www.slipstream.com/>`_.  He asked me to do a contract for him to build
+an initial prototype of a transparent proxy server for mobile networks.  The
+idea was similar to sshuttle: if you reassemble and then disassemble the TCP
+packets, you can reduce latency and improve performance vs.  just forwarding
+the packets over a plain VPN or mobile network.  (It's unlikely that any of my
+code has persisted in the Slipstream product today, but the concept is still
+pretty cool.  I'm still horrified that people use plain TCP on complex mobile
+networks with crazily variable latency, for which it was never really
+intended.)
+
+That project I did for Slipstream was what first gave me the idea to merge
+the concepts of Fast Forward, Double Vision, and Tunnel Vision into a single
+program that was the best of all worlds.  And here we are, at last.
+You're welcome.
+

docs/usage.rst

@@ -0,0 +1,62 @@
+Usage
+=====
+
+.. note::
+
+    For information on usage with Windows, see the :doc:`windows` section.
+    For information on using the TProxy method, see the :doc:`tproxy` section.
+
+Forward all traffic::
+
+    sshuttle -r username@sshserver 0.0.0.0/0
+
+- Use the :option:`sshuttle -r` parameter to specify a remote server.
+
+- By default sshuttle will automatically choose a method to use. Override with
+  the :option:`sshuttle --method` parameter.
+
+- There is a shortcut for 0.0.0.0/0 for those that value
+  their wrists::
+
+      sshuttle -r username@sshserver 0/0
+
+If you would also like your DNS queries to be proxied
+through the DNS server of the server you are connect to::
+
+  sshuttle --dns -r username@sshserver 0/0
+
+The above is probably what you want to use to prevent
+local network attacks such as Firesheep and friends.
+See the documentation for the :option:`sshuttle --dns` parameter.
+
+(You may be prompted for one or more passwords; first, the local password to
+become root using sudo, and then the remote ssh password.  Or you might have
+sudo and ssh set up to not require passwords, in which case you won't be
+prompted at all.)
+
+
+Usage Notes
+-----------
+That's it!  Now your local machine can access the remote network as if you
+were right there.  And if your "client" machine is a router, everyone on
+your local network can make connections to your remote network.
+
+You don't need to install sshuttle on the remote server;
+the remote server just needs to have python available. 
+sshuttle will automatically upload and run its source code
+to the remote python interpreter.
+
+This creates a transparent proxy server on your local machine for all IP
+addresses that match 0.0.0.0/0.  (You can use more specific IP addresses if
+you want; use any number of IP addresses or subnets to change which
+addresses get proxied.  Using 0.0.0.0/0 proxies *everything*, which is
+interesting if you don't trust the people on your local network.)
+
+Any TCP session you initiate to one of the proxied IP addresses will be
+captured by sshuttle and sent over an ssh session to the remote copy of
+sshuttle, which will then regenerate the connection on that end, and funnel
+the data back and forth through ssh.
+
+Fun, right?  A poor man's instant VPN, and you don't even have to have
+admin access on the server.
+

docs/windows.rst

@@ -0,0 +1,19 @@
+Microsoft Windows
+=================
+Currently there is no built in support for running sshuttle directly on
+Microsoft Windows.
+
+What we can really do is to create a Linux VM with Vagrant (or simply
+Virtualbox if you like). In the Vagrant settings, remember to turn on bridged
+NIC. Then, run sshuttle inside the VM like below::
+
+    sshuttle -l 0.0.0.0 -x 10.0.0.0/8 -x 192.168.0.0/16 0/0
+
+10.0.0.0/8 excludes NAT traffic of Vagrant and 192.168.0.0/16 excludes
+traffic to local area network (assuming that we're using 192.168.0.0 subnet).
+
+Assuming the VM has the IP 192.168.1.200 obtained on the bridge NIC (we can
+configure that in Vagrant), we can then ask Windows to route all its traffic
+via the VM by running the following in cmd.exe with admin right::
+
+     route add 0.0.0.0 mask 0.0.0.0 192.168.1.200

firewall.py

@@ -1,460 +0,0 @@
-import re, errno, socket, select, struct
-import compat.ssubprocess as ssubprocess
-import helpers, ssyslog
-from helpers import *
-
-# python doesn't have a definition for this
-IPPROTO_DIVERT = 254
-
-
-def nonfatal(func, *args):
-    try:
-        func(*args)
-    except Fatal, e:
-        log('error: %s\n' % e)
-
-
-def ipt_chain_exists(name):
-    argv = ['iptables', '-t', 'nat', '-nL']
-    p = ssubprocess.Popen(argv, stdout = ssubprocess.PIPE)
-    for line in p.stdout:
-        if line.startswith('Chain %s ' % name):
-            return True
-    rv = p.wait()
-    if rv:
-        raise Fatal('%r returned %d' % (argv, rv))
-
-
-def ipt(*args):
-    argv = ['iptables', '-t', 'nat'] + list(args)
-    debug1('>> %s\n' % ' '.join(argv))
-    rv = ssubprocess.call(argv)
-    if rv:
-        raise Fatal('%r returned %d' % (argv, rv))
-
-
-_no_ttl_module = False
-def ipt_ttl(*args):
-    global _no_ttl_module
-    if not _no_ttl_module:
-        # we avoid infinite loops by generating server-side connections
-        # with ttl 42.  This makes the client side not recapture those
-        # connections, in case client == server.
-        try:
-            argsplus = list(args) + ['-m', 'ttl', '!', '--ttl', '42']
-            ipt(*argsplus)
-        except Fatal:
-            ipt(*args)
-            # we only get here if the non-ttl attempt succeeds
-            log('sshuttle: warning: your iptables is missing '
-                'the ttl module.\n')
-            _no_ttl_module = True
-    else:
-        ipt(*args)
-
-
-
-# We name the chain based on the transproxy port number so that it's possible
-# to run multiple copies of sshuttle at the same time.  Of course, the
-# multiple copies shouldn't have overlapping subnets, or only the most-
-# recently-started one will win (because we use "-I OUTPUT 1" instead of
-# "-A OUTPUT").
-def do_iptables(port, dnsport, subnets):
-    chain = 'sshuttle-%s' % port
-
-    # basic cleanup/setup of chains
-    if ipt_chain_exists(chain):
-        nonfatal(ipt, '-D', 'OUTPUT', '-j', chain)
-        nonfatal(ipt, '-D', 'PREROUTING', '-j', chain)
-        nonfatal(ipt, '-F', chain)
-        ipt('-X', chain)
-
-    if subnets or dnsport:
-        ipt('-N', chain)
-        ipt('-F', chain)
-        ipt('-I', 'OUTPUT', '1', '-j', chain)
-        ipt('-I', 'PREROUTING', '1', '-j', chain)
-
-    if subnets:
-        # create new subnet entries.  Note that we're sorting in a very
-        # particular order: we need to go from most-specific (largest swidth)
-        # to least-specific, and at any given level of specificity, we want
-        # excludes to come first.  That's why the columns are in such a non-
-        # intuitive order.
-        for swidth,sexclude,snet in sorted(subnets, reverse=True):
-            if sexclude:
-                ipt('-A', chain, '-j', 'RETURN',
-                    '--dest', '%s/%s' % (snet,swidth),
-                    '-p', 'tcp')
-            else:
-                ipt_ttl('-A', chain, '-j', 'REDIRECT',
-                        '--dest', '%s/%s' % (snet,swidth),
-                        '-p', 'tcp',
-                        '--to-ports', str(port))
-                
-    if dnsport:
-        nslist = resolvconf_nameservers()
-        for ip in nslist:
-            ipt_ttl('-A', chain, '-j', 'REDIRECT',
-                    '--dest', '%s/32' % ip,
-                    '-p', 'udp',
-                    '--dport', '53',
-                    '--to-ports', str(dnsport))
-
-
-def ipfw_rule_exists(n):
-    argv = ['ipfw', 'list']
-    p = ssubprocess.Popen(argv, stdout = ssubprocess.PIPE)
-    found = False
-    for line in p.stdout:
-        if line.startswith('%05d ' % n):
-            if not ('ipttl 42' in line
-                    or ('skipto %d' % (n+1)) in line
-                    or 'check-state' in line):
-                log('non-sshuttle ipfw rule: %r\n' % line.strip())
-                raise Fatal('non-sshuttle ipfw rule #%d already exists!' % n)
-            found = True
-    rv = p.wait()
-    if rv:
-        raise Fatal('%r returned %d' % (argv, rv))
-    return found
-
-
-_oldctls = {}
-def _fill_oldctls(prefix):
-    argv = ['sysctl', prefix]
-    p = ssubprocess.Popen(argv, stdout = ssubprocess.PIPE)
-    for line in p.stdout:
-        assert(line[-1] == '\n')
-        (k,v) = line[:-1].split(': ', 1)
-        _oldctls[k] = v
-    rv = p.wait()
-    if rv:
-        raise Fatal('%r returned %d' % (argv, rv))
-    if not line:
-        raise Fatal('%r returned no data' % (argv,))
-
-
-def _sysctl_set(name, val):
-    argv = ['sysctl', '-w', '%s=%s' % (name, val)]
-    debug1('>> %s\n' % ' '.join(argv))
-    return ssubprocess.call(argv, stdout = open('/dev/null', 'w'))
-
-
-_changedctls = []
-def sysctl_set(name, val, permanent=False):
-    PREFIX = 'net.inet.ip'
-    assert(name.startswith(PREFIX + '.'))
-    val = str(val)
-    if not _oldctls:
-        _fill_oldctls(PREFIX)
-    if not (name in _oldctls):
-        debug1('>> No such sysctl: %r\n' % name)
-        return False
-    oldval = _oldctls[name]
-    if val != oldval:
-        rv = _sysctl_set(name, val)
-        if rv==0 and permanent:
-            debug1('>>   ...saving permanently in /etc/sysctl.conf\n')
-            f = open('/etc/sysctl.conf', 'a')
-            f.write('\n'
-                    '# Added by sshuttle\n'
-                    '%s=%s\n' % (name, val))
-            f.close()
-        else:
-            _changedctls.append(name)
-        return True
-
-
-def _udp_unpack(p):
-    src = (socket.inet_ntoa(p[12:16]), struct.unpack('!H', p[20:22])[0])
-    dst = (socket.inet_ntoa(p[16:20]), struct.unpack('!H', p[22:24])[0])
-    return src, dst
-
-
-def _udp_repack(p, src, dst):
-    addrs = socket.inet_aton(src[0]) + socket.inet_aton(dst[0])
-    ports = struct.pack('!HH', src[1], dst[1])
-    return p[:12] + addrs + ports + p[24:]
-
-
-_real_dns_server = [None]
-def _handle_diversion(divertsock, dnsport):
-    p,tag = divertsock.recvfrom(4096)
-    src,dst = _udp_unpack(p)
-    debug3('got diverted packet from %r to %r\n' % (src, dst))
-    if dst[1] == 53:
-        # outgoing DNS
-        debug3('...packet is a DNS request.\n')
-        _real_dns_server[0] = dst
-        dst = ('127.0.0.1', dnsport)
-    elif src[1] == dnsport:
-        if islocal(src[0]):
-            debug3('...packet is a DNS response.\n')
-            src = _real_dns_server[0]
-    else:
-        log('weird?! unexpected divert from %r to %r\n' % (src, dst))
-        assert(0)
-    newp = _udp_repack(p, src, dst)
-    divertsock.sendto(newp, tag)
-    
-
-def ipfw(*args):
-    argv = ['ipfw', '-q'] + list(args)
-    debug1('>> %s\n' % ' '.join(argv))
-    rv = ssubprocess.call(argv)
-    if rv:
-        raise Fatal('%r returned %d' % (argv, rv))
-
-
-def do_ipfw(port, dnsport, subnets):
-    sport = str(port)
-    xsport = str(port+1)
-
-    # cleanup any existing rules
-    if ipfw_rule_exists(port):
-        ipfw('delete', sport)
-
-    while _changedctls:
-        name = _changedctls.pop()
-        oldval = _oldctls[name]
-        _sysctl_set(name, oldval)
-
-    if subnets or dnsport:
-        sysctl_set('net.inet.ip.fw.enable', 1)
-        changed = sysctl_set('net.inet.ip.scopedroute', 0, permanent=True)
-        if changed:
-            log("\n"
-                "        WARNING: ONE-TIME NETWORK DISRUPTION:\n"
-                "        =====================================\n"
-                "sshuttle has changed a MacOS kernel setting to work around\n"
-                "a bug in MacOS 10.6.  This will cause your network to drop\n"
-                "within 5-10 minutes unless you restart your network\n"
-                "interface (change wireless networks or unplug/plug the\n"
-                "ethernet port) NOW, then restart sshuttle.  The fix is\n"
-                "permanent; you only have to do this once.\n\n")
-            sys.exit(1)
-
-        ipfw('add', sport, 'check-state', 'ip',
-             'from', 'any', 'to', 'any')
-
-    if subnets:
-        # create new subnet entries
-        for swidth,sexclude,snet in sorted(subnets, reverse=True):
-            if sexclude:
-                ipfw('add', sport, 'skipto', xsport,
-                     'log', 'tcp',
-                     'from', 'any', 'to', '%s/%s' % (snet,swidth))
-            else:
-                ipfw('add', sport, 'fwd', '127.0.0.1,%d' % port,
-                     'log', 'tcp',
-                     'from', 'any', 'to', '%s/%s' % (snet,swidth),
-                     'not', 'ipttl', '42', 'keep-state', 'setup')
-
-    # This part is much crazier than it is on Linux, because MacOS (at least
-    # 10.6, and probably other versions, and maybe FreeBSD too) doesn't
-    # correctly fixup the dstip/dstport for UDP packets when it puts them
-    # through a 'fwd' rule.  It also doesn't fixup the srcip/srcport in the
-    # response packet.  In Linux iptables, all that happens magically for us,
-    # so we just redirect the packets and relax.
-    #
-    # On MacOS, we have to fix the ports ourselves.  For that, we use a
-    # 'divert' socket, which receives raw packets and lets us mangle them.
-    #
-    # Here's how it works.  Let's say the local DNS server is 1.1.1.1:53,
-    # and the remote DNS server is 2.2.2.2:53, and the local transproxy port
-    # is 10.0.0.1:12300, and a client machine is making a request from
-    # 10.0.0.5:9999. We see a packet like this:
-    #    10.0.0.5:9999 -> 1.1.1.1:53
-    # Since the destip:port matches one of our local nameservers, it will
-    # match a 'fwd' rule, thus grabbing it on the local machine.  However,
-    # the local kernel will then see a packet addressed to *:53 and
-    # not know what to do with it; there's nobody listening on port 53.  Thus,
-    # we divert it, rewriting it into this:
-    #    10.0.0.5:9999 -> 10.0.0.1:12300
-    # This gets proxied out to the server, which sends it to 2.2.2.2:53,
-    # and the answer comes back, and the proxy sends it back out like this:
-    #    10.0.0.1:12300 -> 10.0.0.5:9999
-    # But that's wrong!  The original machine expected an answer from
-    # 1.1.1.1:53, so we have to divert the *answer* and rewrite it:
-    #    1.1.1.1:53 -> 10.0.0.5:9999
-    #
-    # See?  Easy stuff.
-    if dnsport:
-        divertsock = socket.socket(socket.AF_INET, socket.SOCK_RAW,
-                                   IPPROTO_DIVERT)
-        divertsock.bind(('0.0.0.0', port)) # IP field is ignored
-
-        nslist = resolvconf_nameservers()
-        for ip in nslist:
-            # relabel and then catch outgoing DNS requests
-            ipfw('add', sport, 'divert', sport,
-                 'log', 'udp',
-                 'from', 'any', 'to', '%s/32' % ip, '53',
-                 'not', 'ipttl', '42')
-        # relabel DNS responses
-        ipfw('add', sport, 'divert', sport,
-             'log', 'udp',
-             'from', 'any', str(dnsport), 'to', 'any',
-             'not', 'ipttl', '42')
-
-        def do_wait():
-            while 1:
-                r,w,x = select.select([sys.stdin, divertsock], [], [])
-                if divertsock in r:
-                    _handle_diversion(divertsock, dnsport)
-                if sys.stdin in r:
-                    return
-    else:
-        do_wait = None
-        
-    return do_wait
-
-
-def program_exists(name):
-    paths = (os.getenv('PATH') or os.defpath).split(os.pathsep)
-    for p in paths:
-        fn = '%s/%s' % (p, name)
-        if os.path.exists(fn):
-            return not os.path.isdir(fn) and os.access(fn, os.X_OK)
-
-
-hostmap = {}
-def rewrite_etc_hosts(port):
-    HOSTSFILE='/etc/hosts'
-    BAKFILE='%s.sbak' % HOSTSFILE
-    APPEND='# sshuttle-firewall-%d AUTOCREATED' % port
-    old_content = ''
-    st = None
-    try:
-        old_content = open(HOSTSFILE).read()
-        st = os.stat(HOSTSFILE)
-    except IOError, e:
-        if e.errno == errno.ENOENT:
-            pass
-        else:
-            raise
-    if old_content.strip() and not os.path.exists(BAKFILE):
-        os.link(HOSTSFILE, BAKFILE)
-    tmpname = "%s.%d.tmp" % (HOSTSFILE, port)
-    f = open(tmpname, 'w')
-    for line in old_content.rstrip().split('\n'):
-        if line.find(APPEND) >= 0:
-            continue
-        f.write('%s\n' % line)
-    for (name,ip) in sorted(hostmap.items()):
-        f.write('%-30s %s\n' % ('%s %s' % (ip,name), APPEND))
-    f.close()
-
-    if st:
-        os.chown(tmpname, st.st_uid, st.st_gid)
-        os.chmod(tmpname, st.st_mode)
-    else:
-        os.chown(tmpname, 0, 0)
-        os.chmod(tmpname, 0644)
-    os.rename(tmpname, HOSTSFILE)
-
-
-def restore_etc_hosts(port):
-    global hostmap
-    hostmap = {}
-    rewrite_etc_hosts(port)
-
-
-# This is some voodoo for setting up the kernel's transparent
-# proxying stuff.  If subnets is empty, we just delete our sshuttle rules;
-# otherwise we delete it, then make them from scratch.
-#
-# This code is supposed to clean up after itself by deleting its rules on
-# exit.  In case that fails, it's not the end of the world; future runs will
-# supercede it in the transproxy list, at least, so the leftover rules
-# are hopefully harmless.
-def main(port, dnsport, syslog):
-    assert(port > 0)
-    assert(port <= 65535)
-    assert(dnsport >= 0)
-    assert(dnsport <= 65535)
-
-    if os.getuid() != 0:
-        raise Fatal('you must be root (or enable su/sudo) to set the firewall')
-
-    if program_exists('ipfw'):
-        do_it = do_ipfw
-    elif program_exists('iptables'):
-        do_it = do_iptables
-    else:
-        raise Fatal("can't find either ipfw or iptables; check your PATH")
-
-    # because of limitations of the 'su' command, the *real* stdin/stdout
-    # are both attached to stdout initially.  Clone stdout into stdin so we
-    # can read from it.
-    os.dup2(1, 0)
-
-    if syslog:
-        ssyslog.start_syslog()
-        ssyslog.stderr_to_syslog()
-
-    debug1('firewall manager ready.\n')
-    sys.stdout.write('READY\n')
-    sys.stdout.flush()
-
-    # ctrl-c shouldn't be passed along to me.  When the main sshuttle dies,
-    # I'll die automatically.
-    os.setsid()
-
-    # we wait until we get some input before creating the rules.  That way,
-    # sshuttle can launch us as early as possible (and get sudo password
-    # authentication as early in the startup process as possible).
-    line = sys.stdin.readline(128)
-    if not line:
-        return  # parent died; nothing to do
-
-    subnets = []
-    if line != 'ROUTES\n':
-        raise Fatal('firewall: expected ROUTES but got %r' % line)
-    while 1:
-        line = sys.stdin.readline(128)
-        if not line:
-            raise Fatal('firewall: expected route but got %r' % line)
-        elif line == 'GO\n':
-            break
-        try:
-            (width,exclude,ip) = line.strip().split(',', 2)
-        except:
-            raise Fatal('firewall: expected route or GO but got %r' % line)
-        subnets.append((int(width), bool(int(exclude)), ip))
-        
-    try:
-        if line:
-            debug1('firewall manager: starting transproxy.\n')
-            do_wait = do_it(port, dnsport, subnets)
-            sys.stdout.write('STARTED\n')
-        
-        try:
-            sys.stdout.flush()
-        except IOError:
-            # the parent process died for some reason; he's surely been loud
-            # enough, so no reason to report another error
-            return
-
-        # Now we wait until EOF or any other kind of exception.  We need
-        # to stay running so that we don't need a *second* password
-        # authentication at shutdown time - that cleanup is important!
-        while 1:
-            if do_wait: do_wait()
-            line = sys.stdin.readline(128)
-            if line.startswith('HOST '):
-                (name,ip) = line[5:].strip().split(',', 1)
-                hostmap[name] = ip
-                rewrite_etc_hosts(port)
-            elif line:
-                raise Fatal('expected EOF, got %r' % line)
-            else:
-                break
-    finally:
-        try:
-            debug1('firewall manager: undoing changes.\n')
-        except:
-            pass
-        do_it(port, 0, [])
-        restore_etc_hosts(port)

main.py

@@ -1,130 +0,0 @@
-import sys, os, re
-import helpers, options, client, server, firewall, hostwatch
-import compat.ssubprocess as ssubprocess
-from helpers import *
-
-
-# list of:
-# 1.2.3.4/5 or just 1.2.3.4
-def parse_subnets(subnets_str):
-    subnets = []
-    for s in subnets_str:
-        m = re.match(r'(\d+)(?:\.(\d+)\.(\d+)\.(\d+))?(?:/(\d+))?$', s)
-        if not m:
-            raise Fatal('%r is not a valid IP subnet format' % s)
-        (a,b,c,d,width) = m.groups()
-        (a,b,c,d) = (int(a or 0), int(b or 0), int(c or 0), int(d or 0))
-        if width == None:
-            width = 32
-        else:
-            width = int(width)
-        if a > 255 or b > 255 or c > 255 or d > 255:
-            raise Fatal('%d.%d.%d.%d has numbers > 255' % (a,b,c,d))
-        if width > 32:
-            raise Fatal('*/%d is greater than the maximum of 32' % width)
-        subnets.append(('%d.%d.%d.%d' % (a,b,c,d), width))
-    return subnets
-
-
-# 1.2.3.4:567 or just 1.2.3.4 or just 567
-def parse_ipport(s):
-    s = str(s)
-    m = re.match(r'(?:(\d+)\.(\d+)\.(\d+)\.(\d+))?(?::)?(?:(\d+))?$', s)
-    if not m:
-        raise Fatal('%r is not a valid IP:port format' % s)
-    (a,b,c,d,port) = m.groups()
-    (a,b,c,d,port) = (int(a or 0), int(b or 0), int(c or 0), int(d or 0),
-                      int(port or 0))
-    if a > 255 or b > 255 or c > 255 or d > 255:
-        raise Fatal('%d.%d.%d.%d has numbers > 255' % (a,b,c,d))
-    if port > 65535:
-        raise Fatal('*:%d is greater than the maximum of 65535' % port)
-    if a == None:
-        a = b = c = d = 0
-    return ('%d.%d.%d.%d' % (a,b,c,d), port)
-
-
-optspec = """
-sshuttle [-l [ip:]port] [-r [username@]sshserver[:port]] <subnets...>
-sshuttle --server
-sshuttle --firewall <port> <subnets...>
-sshuttle --hostwatch
---
-l,listen=  transproxy to this ip address and port number [127.0.0.1:0]
-H,auto-hosts scan for remote hostnames and update local /etc/hosts
-N,auto-nets  automatically determine subnets to route
-dns        capture local DNS requests and forward to the remote DNS server
-python=    path to python interpreter on the remote server
-r,remote=  ssh hostname (and optional username) of remote sshuttle server
-x,exclude= exclude this subnet (can be used more than once)
-v,verbose  increase debug message verbosity
-e,ssh-cmd= the command to use to connect to the remote [ssh]
-seed-hosts= with -H, use these hostnames for initial scan (comma-separated)
-no-latency-control  sacrifice latency to improve bandwidth benchmarks
-wrap=      restart counting channel numbers after this number (for testing)
-D,daemon   run in the background as a daemon
-syslog     send log messages to syslog (default if you use --daemon)
-pidfile=   pidfile name (only if using --daemon) [./sshuttle.pid]
-server     (internal use only)
-firewall   (internal use only)
-hostwatch  (internal use only)
-"""
-o = options.Options(optspec)
-(opt, flags, extra) = o.parse(sys.argv[2:])
-
-if opt.daemon:
-    opt.syslog = 1
-if opt.wrap:
-    import ssnet
-    ssnet.MAX_CHANNEL = int(opt.wrap)
-helpers.verbose = opt.verbose
-
-try:
-    if opt.server:
-        if len(extra) != 0:
-            o.fatal('no arguments expected')
-        server.latency_control = opt.latency_control
-        sys.exit(server.main())
-    elif opt.firewall:
-        if len(extra) != 2:
-            o.fatal('exactly two arguments expected')
-        sys.exit(firewall.main(int(extra[0]), int(extra[1]), opt.syslog))
-    elif opt.hostwatch:
-        sys.exit(hostwatch.hw_main(extra))
-    else:
-        if len(extra) < 1 and not opt.auto_nets:
-            o.fatal('at least one subnet (or -N) expected')
-        includes = extra
-        excludes = ['127.0.0.0/8']
-        for k,v in flags:
-            if k in ('-x','--exclude'):
-                excludes.append(v)
-        remotename = opt.remote
-        if remotename == '' or remotename == '-':
-            remotename = None
-        if opt.seed_hosts and not opt.auto_hosts:
-            o.fatal('--seed-hosts only works if you also use -H')
-        if opt.seed_hosts:
-            sh = re.split(r'[\s,]+', (opt.seed_hosts or "").strip())
-        elif opt.auto_hosts:
-            sh = []
-        else:
-            sh = None
-        sys.exit(client.main(parse_ipport(opt.listen or '0.0.0.0:0'),
-                             opt.ssh_cmd,
-                             remotename,
-                             opt.python,
-                             opt.latency_control,
-                             opt.dns,
-                             sh,
-                             opt.auto_nets,
-                             parse_subnets(includes),
-                             parse_subnets(excludes),
-                             opt.syslog, opt.daemon, opt.pidfile))
-except Fatal, e:
-    log('fatal: %s\n' % e)
-    sys.exit(99)
-except KeyboardInterrupt:
-    log('\n')
-    log('Keyboard interrupt: exiting.\n')
-    sys.exit(1)

requirements.txt

@@ -0,0 +1 @@
+setuptools_scm

run

@@ -0,0 +1,6 @@
+#!/bin/sh
+if python3.5 -V 2>/dev/null; then
+	exec python3.5 -m "sshuttle" "$@"
+else
+	exec python -m "sshuttle" "$@"
+fi

server.py

@@ -1,247 +0,0 @@
-import re, struct, socket, select, traceback, time
-if not globals().get('skip_imports'):
-    import ssnet, helpers, hostwatch
-    import compat.ssubprocess as ssubprocess
-    from ssnet import SockWrapper, Handler, Proxy, Mux, MuxWrapper
-    from helpers import *
-
-
-def _ipmatch(ipstr):
-    if ipstr == 'default':
-        ipstr = '0.0.0.0/0'
-    m = re.match(r'^(\d+(\.\d+(\.\d+(\.\d+)?)?)?)(?:/(\d+))?$', ipstr)
-    if m:
-        g = m.groups()
-        ips = g[0]
-        width = int(g[4] or 32)
-        if g[1] == None:
-            ips += '.0.0.0'
-            width = min(width, 8)
-        elif g[2] == None:
-            ips += '.0.0'
-            width = min(width, 16)
-        elif g[3] == None:
-            ips += '.0'
-            width = min(width, 24)
-        return (struct.unpack('!I', socket.inet_aton(ips))[0], width)
-
-
-def _ipstr(ip, width):
-    if width >= 32:
-        return ip
-    else:
-        return "%s/%d" % (ip, width)
-
-
-def _maskbits(netmask):
-    if not netmask:
-        return 32
-    for i in range(32):
-        if netmask[0] & _shl(1, i):
-            return 32-i
-    return 0
-    
-    
-def _shl(n, bits):
-    return n * int(2**bits)
-
-
-def _list_routes():
-    argv = ['netstat', '-rn']
-    p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE)
-    routes = []
-    for line in p.stdout:
-        cols = re.split(r'\s+', line)
-        ipw = _ipmatch(cols[0])
-        if not ipw:
-            continue  # some lines won't be parseable; never mind
-        maskw = _ipmatch(cols[2])  # linux only
-        mask = _maskbits(maskw)   # returns 32 if maskw is null
-        width = min(ipw[1], mask)
-        ip = ipw[0] & _shl(_shl(1, width) - 1, 32-width)
-        routes.append((socket.inet_ntoa(struct.pack('!I', ip)), width))
-    rv = p.wait()
-    if rv != 0:
-        log('WARNING: %r returned %d\n' % (argv, rv))
-        log('WARNING: That prevents --auto-nets from working.\n')
-    return routes
-
-
-def list_routes():
-    for (ip,width) in _list_routes():
-        if not ip.startswith('0.') and not ip.startswith('127.'):
-            yield (ip,width)
-
-
-def _exc_dump():
-    exc_info = sys.exc_info()
-    return ''.join(traceback.format_exception(*exc_info))
-
-
-def start_hostwatch(seed_hosts):
-    s1,s2 = socket.socketpair()
-    pid = os.fork()
-    if not pid:
-        # child
-        rv = 99
-        try:
-            try:
-                s2.close()
-                os.dup2(s1.fileno(), 1)
-                os.dup2(s1.fileno(), 0)
-                s1.close()
-                rv = hostwatch.hw_main(seed_hosts) or 0
-            except Exception, e:
-                log('%s\n' % _exc_dump())
-                rv = 98
-        finally:
-            os._exit(rv)
-    s1.close()
-    return pid,s2
-
-
-class Hostwatch:
-    def __init__(self):
-        self.pid = 0
-        self.sock = None
-
-
-class DnsProxy(Handler):
-    def __init__(self, mux, chan, request):
-        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        Handler.__init__(self, [sock])
-        self.timeout = time.time()+30
-        self.mux = mux
-        self.chan = chan
-        self.tries = 0
-        self.peer = None
-        self.request = request
-        self.sock = sock
-        self.sock.setsockopt(socket.SOL_IP, socket.IP_TTL, 42)
-        self.try_send()
-
-    def try_send(self):
-        if self.tries >= 3:
-            return
-        self.tries += 1
-        self.peer = resolvconf_random_nameserver()
-        self.sock.connect((self.peer, 53))
-        debug2('DNS: sending to %r\n' % self.peer)
-        try:
-            self.sock.send(self.request)
-        except socket.error, e:
-            if e.args[0] in [errno.ECONNREFUSED, errno.EHOSTUNREACH]:
-                # might have been spurious; try again.
-                # Note: these errors sometimes are reported by recv(),
-                # and sometimes by send().  We have to catch both.
-                debug2('DNS send to %r: %s\n' % (self.peer, e))
-                self.try_send()
-                return
-            else:
-                log('DNS send to %r: %s\n' % (self.peer, e))
-                return
-
-    def callback(self):
-        try:
-            data = self.sock.recv(4096)
-        except socket.error, e:
-            if e.args[0] in [errno.ECONNREFUSED, errno.EHOSTUNREACH]:
-                # might have been spurious; try again.
-                # Note: these errors sometimes are reported by recv(),
-                # and sometimes by send().  We have to catch both.
-                debug2('DNS recv from %r: %s\n' % (self.peer, e))
-                self.try_send()
-                return
-            else:
-                log('DNS recv from %r: %s\n' % (self.peer, e))
-                return
-        debug2('DNS response: %d bytes\n' % len(data))
-        self.mux.send(self.chan, ssnet.CMD_DNS_RESPONSE, data)
-        self.ok = False
-
-
-def main():
-    if helpers.verbose >= 1:
-        helpers.logprefix = ' s: '
-    else:
-        helpers.logprefix = 'server: '
-    debug1('latency control setting = %r\n' % latency_control)
-
-    routes = list(list_routes())
-    debug1('available routes:\n')
-    for r in routes:
-        debug1('  %s/%d\n' % r)
-        
-    # synchronization header
-    sys.stdout.write('SSHUTTLE0001')
-    sys.stdout.flush()
-
-    handlers = []
-    mux = Mux(socket.fromfd(sys.stdin.fileno(),
-                            socket.AF_INET, socket.SOCK_STREAM),
-              socket.fromfd(sys.stdout.fileno(),
-                            socket.AF_INET, socket.SOCK_STREAM))
-    handlers.append(mux)
-    routepkt = ''
-    for r in routes:
-        routepkt += '%s,%d\n' % r
-    mux.send(0, ssnet.CMD_ROUTES, routepkt)
-
-    hw = Hostwatch()
-    hw.leftover = ''
-        
-    def hostwatch_ready():
-        assert(hw.pid)
-        content = hw.sock.recv(4096)
-        if content:
-            lines = (hw.leftover + content).split('\n')
-            if lines[-1]:
-                # no terminating newline: entry isn't complete yet!
-                hw.leftover = lines.pop()
-                lines.append('')
-            else:
-                hw.leftover = ''
-            mux.send(0, ssnet.CMD_HOST_LIST, '\n'.join(lines))
-        else:
-            raise Fatal('hostwatch process died')
-
-    def got_host_req(data):
-        if not hw.pid:
-            (hw.pid,hw.sock) = start_hostwatch(data.strip().split())
-            handlers.append(Handler(socks = [hw.sock],
-                                    callback = hostwatch_ready))
-    mux.got_host_req = got_host_req
-
-    def new_channel(channel, data):
-        (dstip,dstport) = data.split(',', 1)
-        dstport = int(dstport)
-        outwrap = ssnet.connect_dst(dstip,dstport)
-        handlers.append(Proxy(MuxWrapper(mux, channel), outwrap))
-    mux.new_channel = new_channel
-
-    dnshandlers = {}
-    def dns_req(channel, data):
-        debug2('Incoming DNS request.\n')
-        h = DnsProxy(mux, channel, data)
-        handlers.append(h)
-        dnshandlers[channel] = h
-    mux.got_dns_req = dns_req
-
-    while mux.ok:
-        if hw.pid:
-            assert(hw.pid > 0)
-            (rpid, rv) = os.waitpid(hw.pid, os.WNOHANG)
-            if rpid:
-                raise Fatal('hostwatch exited unexpectedly: code 0x%04x\n' % rv)
-        
-        ssnet.runonce(handlers, mux)
-        if latency_control:
-            mux.check_fullness()
-        mux.callback()
-
-        if dnshandlers:
-            now = time.time()
-            for channel,h in dnshandlers.items():
-                if h.timeout < now or not h.ok:
-                    del dnshandlers[channel]
-                    h.ok = False

setup.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+
+# Copyright 2012-2014 Brian May
+#
+# This file is part of python-tldap.
+#
+# python-tldap is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# python-tldap is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with python-tldap  If not, see <http://www.gnu.org/licenses/>.
+
+from setuptools import setup, find_packages
+
+
+def version_scheme(version):
+    from setuptools_scm.version import guess_next_dev_version
+    version = guess_next_dev_version(version)
+    return version.lstrip("v")
+
+setup(
+    name="sshuttle",
+    use_scm_version={
+        'write_to': "sshuttle/version.py",
+        'version_scheme': version_scheme,
+    },
+    setup_requires=['setuptools_scm'],
+    # version=version,
+    url='https://github.com/sshuttle/sshuttle',
+    author='Brian May',
+    author_email='brian@linuxpenguins.xyz',
+    description='Full-featured" VPN over an SSH tunnel',
+    packages=find_packages(),
+    license="GPL2+",
+    long_description=open('README.rst').read(),
+    classifiers=[
+        "Development Status :: 5 - Production/Stable",
+        "Intended Audience :: Developers",
+        "Intended Audience :: End Users/Desktop",
+        "License :: OSI Approved :: "
+            "GNU General Public License v2 or later (GPLv2+)",
+        "Operating System :: OS Independent",
+        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3.5",
+        "Topic :: System :: Networking",
+    ],
+    entry_points={
+        'console_scripts': [
+            'sshuttle = sshuttle.cmdline:main',
+        ],
+    },
+    tests_require=['pytest', 'mock'],
+    keywords="ssh vpn",
+)

ssh.py

@@ -1,106 +0,0 @@
-import sys, os, re, socket, zlib
-import compat.ssubprocess as ssubprocess
-import helpers
-from helpers import *
-
-
-def readfile(name):
-    basedir = os.path.dirname(os.path.abspath(sys.argv[0]))
-    path = [basedir] + sys.path
-    for d in path:
-        fullname = os.path.join(d, name)
-        if os.path.exists(fullname):
-            return open(fullname, 'rb').read()
-    raise Exception("can't find file %r in any of %r" % (name, path))
-
-
-def empackage(z, filename, data=None):
-    (path,basename) = os.path.split(filename)
-    if not data:
-        data = readfile(filename)
-    content = z.compress(data)
-    content += z.flush(zlib.Z_SYNC_FLUSH)
-    return '%s\n%d\n%s' % (basename, len(content), content)
-
-
-def connect(ssh_cmd, rhostport, python, stderr, options):
-    main_exe = sys.argv[0]
-    portl = []
-
-    rhostIsIPv6 = False
-    if (rhostport or '').count(':') > 1:
-        rhostIsIPv6 = True
-        if rhostport.count(']') or rhostport.count('['):
-            result = rhostport.split(']')
-            rhost = result[0].strip('[')
-            if len(result) > 1:
-                result[1] = result[1].strip(':')
-                if result[1] is not '':
-                    portl = ['-p', str(int(result[1]))]
-        else: # can't disambiguate IPv6 colons and a port number. pass the hostname through.
-            rhost = rhostport
-    else: # IPv4
-        l = (rhostport or '').split(':', 1)
-        rhost = l[0]
-        if len(l) > 1:
-            portl = ['-p', str(int(l[1]))]
-
-    if rhost == '-':
-        rhost = None
-
-    ipv6flag = []
-    if rhostIsIPv6:
-        ipv6flag = ['-6']
-
-    z = zlib.compressobj(1)
-    content = readfile('assembler.py')
-    optdata = ''.join("%s=%r\n" % (k,v) for (k,v) in options.items())
-    content2 = (empackage(z, 'cmdline_options.py', optdata) +
-                empackage(z, 'helpers.py') +
-                empackage(z, 'compat/ssubprocess.py') +
-                empackage(z, 'ssnet.py') +
-                empackage(z, 'hostwatch.py') +
-                empackage(z, 'server.py') +
-                "\n")
-    
-    pyscript = r"""
-                import sys;
-                skip_imports=1;
-                verbosity=%d;
-                exec compile(sys.stdin.read(%d), "assembler.py", "exec")
-                """ % (helpers.verbose or 0, len(content))
-    pyscript = re.sub(r'\s+', ' ', pyscript.strip())
-
-        
-    if not rhost:
-        # ignore the --python argument when running locally; we already know
-        # which python version works.
-        argv = [sys.argv[1], '-c', pyscript]
-    else:
-        if ssh_cmd:
-            sshl = ssh_cmd.split(' ')
-        else:
-            sshl = ['ssh']
-        if python:
-            pycmd = "'%s' -c '%s'" % (python, pyscript)
-        else:
-            pycmd = ("P=python2; $P -V 2>/dev/null || P=python; "
-                     "\"$P\" -c '%s'") % pyscript
-        argv = (sshl + 
-                portl + 
-                ipv6flag + 
-                [rhost, '--', pycmd])
-    (s1,s2) = socket.socketpair()
-    def setup():
-        # runs in the child process
-        s2.close()
-    s1a,s1b = os.dup(s1.fileno()), os.dup(s1.fileno())
-    s1.close()
-    debug2('executing: %r\n' % argv)
-    p = ssubprocess.Popen(argv, stdin=s1a, stdout=s1b, preexec_fn=setup,
-                          close_fds=True, stderr=stderr)
-    os.close(s1a)
-    os.close(s1b)
-    s2.sendall(content)
-    s2.sendall(content2)
-    return p, s2

sshuttle

@@ -1,7 +0,0 @@
-#!/bin/sh
-DIR=$(dirname "$0")
-if python2 -V 2>/dev/null; then
-	exec python2 "$DIR/main.py" python2 "$@"
-else
-	exec python "$DIR/main.py" python "$@"
-fi

sshuttle/__main__.py

@@ -0,0 +1,4 @@
+"""Coverage.py's main entry point."""
+import sys
+from sshuttle.cmdline import main
+sys.exit(main())

sshuttle/assembler.py

@@ -0,0 +1,36 @@
+import sys
+import zlib
+import imp
+
+z = zlib.decompressobj()
+while 1:
+    name = stdin.readline().strip()
+    if name:
+        name = name.decode("ASCII")
+
+        nbytes = int(stdin.readline())
+        if verbosity >= 2:
+            sys.stderr.write('server: assembling %r (%d bytes)\n'
+                             % (name, nbytes))
+        content = z.decompress(stdin.read(nbytes))
+
+        module = imp.new_module(name)
+        parent, _, parent_name = name.rpartition(".")
+        if parent != "":
+            setattr(sys.modules[parent], parent_name, module)
+
+        code = compile(content, name, "exec")
+        exec(code, module.__dict__)
+        sys.modules[name] = module
+    else:
+        break
+
+sys.stderr.flush()
+sys.stdout.flush()
+
+import sshuttle.helpers
+sshuttle.helpers.verbose = verbosity
+
+import sshuttle.cmdline_options as options
+from sshuttle.server import main
+main(options.latency_control)

sshuttle/client.py

@@ -0,0 +1,721 @@
+import socket
+import errno
+import re
+import signal
+import time
+import subprocess as ssubprocess
+import sshuttle.helpers as helpers
+import os
+import sshuttle.ssnet as ssnet
+import sshuttle.ssh as ssh
+import sshuttle.ssyslog as ssyslog
+import sys
+import platform
+from sshuttle.ssnet import SockWrapper, Handler, Proxy, Mux, MuxWrapper
+from sshuttle.helpers import log, debug1, debug2, debug3, Fatal, islocal, \
+    resolvconf_nameservers
+from sshuttle.methods import get_method, Features
+
+_extra_fd = os.open('/dev/null', os.O_RDONLY)
+
+
+def got_signal(signum, frame):
+    log('exiting on signal %d\n' % signum)
+    sys.exit(1)
+
+
+_pidname = None
+
+
+def check_daemon(pidfile):
+    global _pidname
+    _pidname = os.path.abspath(pidfile)
+    try:
+        oldpid = open(_pidname).read(1024)
+    except IOError as e:
+        if e.errno == errno.ENOENT:
+            return  # no pidfile, ok
+        else:
+            raise Fatal("can't read %s: %s" % (_pidname, e))
+    if not oldpid:
+        os.unlink(_pidname)
+        return  # invalid pidfile, ok
+    oldpid = int(oldpid.strip() or 0)
+    if oldpid <= 0:
+        os.unlink(_pidname)
+        return  # invalid pidfile, ok
+    try:
+        os.kill(oldpid, 0)
+    except OSError as e:
+        if e.errno == errno.ESRCH:
+            os.unlink(_pidname)
+            return  # outdated pidfile, ok
+        elif e.errno == errno.EPERM:
+            pass
+        else:
+            raise
+    raise Fatal("%s: sshuttle is already running (pid=%d)"
+                % (_pidname, oldpid))
+
+
+def daemonize():
+    if os.fork():
+        os._exit(0)
+    os.setsid()
+    if os.fork():
+        os._exit(0)
+
+    outfd = os.open(_pidname, os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o666)
+    try:
+        os.write(outfd, b'%d\n' % os.getpid())
+    finally:
+        os.close(outfd)
+    os.chdir("/")
+
+    # Normal exit when killed, or try/finally won't work and the pidfile won't
+    # be deleted.
+    signal.signal(signal.SIGTERM, got_signal)
+
+    si = open('/dev/null', 'r+')
+    os.dup2(si.fileno(), 0)
+    os.dup2(si.fileno(), 1)
+    si.close()
+
+
+def daemon_cleanup():
+    try:
+        os.unlink(_pidname)
+    except OSError as e:
+        if e.errno == errno.ENOENT:
+            pass
+        else:
+            raise
+
+
+class MultiListener:
+
+    def __init__(self, type=socket.SOCK_STREAM, proto=0):
+        self.type = type
+        self.proto = proto
+        self.v6 = None
+        self.v4 = None
+        self.bind_called = False
+
+    def setsockopt(self, level, optname, value):
+        assert(self.bind_called)
+        if self.v6:
+            self.v6.setsockopt(level, optname, value)
+        if self.v4:
+            self.v4.setsockopt(level, optname, value)
+
+    def add_handler(self, handlers, callback, method, mux):
+        assert(self.bind_called)
+        socks = []
+        if self.v6:
+            socks.append(self.v6)
+        if self.v4:
+            socks.append(self.v4)
+
+        handlers.append(
+            Handler(
+                socks,
+                lambda sock: callback(sock, method, mux, handlers)
+            )
+        )
+
+    def listen(self, backlog):
+        assert(self.bind_called)
+        if self.v6:
+            self.v6.listen(backlog)
+        if self.v4:
+            try:
+                self.v4.listen(backlog)
+            except socket.error as e:
+                # on some systems v4 bind will fail if the v6 suceeded,
+                # in this case the v6 socket will receive v4 too.
+                if e.errno == errno.EADDRINUSE and self.v6:
+                    self.v4 = None
+                else:
+                    raise e
+
+    def bind(self, address_v6, address_v4):
+        assert(not self.bind_called)
+        self.bind_called = True
+        if address_v6 is not None:
+            self.v6 = socket.socket(socket.AF_INET6, self.type, self.proto)
+            self.v6.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            self.v6.bind(address_v6)
+        else:
+            self.v6 = None
+        if address_v4 is not None:
+            self.v4 = socket.socket(socket.AF_INET, self.type, self.proto)
+            self.v4.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            self.v4.bind(address_v4)
+        else:
+            self.v4 = None
+
+    def print_listening(self, what):
+        assert(self.bind_called)
+        if self.v6:
+            listenip = self.v6.getsockname()
+            debug1('%s listening on %r.\n' % (what, listenip))
+            debug2('%s listening with %r.\n' % (what, self.v6))
+        if self.v4:
+            listenip = self.v4.getsockname()
+            debug1('%s listening on %r.\n' % (what, listenip))
+            debug2('%s listening with %r.\n' % (what, self.v4))
+
+
+class FirewallClient:
+
+    def __init__(self, method_name):
+        self.auto_nets = []
+        python_path = os.path.dirname(os.path.dirname(__file__))
+        argvbase = ([sys.executable, sys.argv[0]] +
+                    ['-v'] * (helpers.verbose or 0) +
+                    ['--method', method_name] +
+                    ['--firewall'])
+        if ssyslog._p:
+            argvbase += ['--syslog']
+        argv_tries = [
+            ['sudo', '-p', '[local sudo] Password: ',
+                ('PYTHONPATH=%s' % python_path), '--'] + argvbase,
+            argvbase
+        ]
+
+        # we can't use stdin/stdout=subprocess.PIPE here, as we normally would,
+        # because stupid Linux 'su' requires that stdin be attached to a tty.
+        # Instead, attach a *bidirectional* socket to its stdout, and use
+        # that for talking in both directions.
+        (s1, s2) = socket.socketpair()
+
+        def setup():
+            # run in the child process
+            s2.close()
+        e = None
+        if os.getuid() == 0:
+            argv_tries = argv_tries[-1:]  # last entry only
+        for argv in argv_tries:
+            try:
+                if argv[0] == 'su':
+                    sys.stderr.write('[local su] ')
+                self.p = ssubprocess.Popen(argv, stdout=s1, preexec_fn=setup)
+                e = None
+                break
+            except OSError as e:
+                pass
+        self.argv = argv
+        s1.close()
+        if sys.version_info < (3, 0):
+            # python 2.7
+            self.pfile = s2.makefile('wb+')
+        else:
+            # python 3.5
+            self.pfile = s2.makefile('rwb')
+        if e:
+            log('Spawning firewall manager: %r\n' % self.argv)
+            raise Fatal(e)
+        line = self.pfile.readline()
+        self.check()
+        if line[0:5] != b'READY':
+            raise Fatal('%r expected READY, got %r' % (self.argv, line))
+        method_name = line[6:-1]
+        self.method = get_method(method_name.decode("ASCII"))
+        self.method.set_firewall(self)
+
+    def setup(self, subnets_include, subnets_exclude, nslist,
+              redirectport_v6, redirectport_v4, dnsport_v6, dnsport_v4, udp):
+        self.subnets_include = subnets_include
+        self.subnets_exclude = subnets_exclude
+        self.nslist = nslist
+        self.redirectport_v6 = redirectport_v6
+        self.redirectport_v4 = redirectport_v4
+        self.dnsport_v6 = dnsport_v6
+        self.dnsport_v4 = dnsport_v4
+        self.udp = udp
+
+    def check(self):
+        rv = self.p.poll()
+        if rv:
+            raise Fatal('%r returned %d' % (self.argv, rv))
+
+    def start(self):
+        self.pfile.write(b'ROUTES\n')
+        for (family, ip, width) in self.subnets_include + self.auto_nets:
+            self.pfile.write(b'%d,%d,0,%s\n'
+                             % (family, width, ip.encode("ASCII")))
+        for (family, ip, width) in self.subnets_exclude:
+            self.pfile.write(b'%d,%d,1,%s\n'
+                             % (family, width, ip.encode("ASCII")))
+
+        self.pfile.write(b'NSLIST\n')
+        for (family, ip) in self.nslist:
+            self.pfile.write(b'%d,%s\n'
+                             % (family, ip.encode("ASCII")))
+
+        self.pfile.write(
+            b'PORTS %d,%d,%d,%d\n'
+            % (self.redirectport_v6, self.redirectport_v4,
+               self.dnsport_v6, self.dnsport_v4))
+
+        udp = 0
+        if self.udp:
+            udp = 1
+
+        self.pfile.write(b'GO %d\n' % udp)
+        self.pfile.flush()
+
+        line = self.pfile.readline()
+        self.check()
+        if line != b'STARTED\n':
+            raise Fatal('%r expected STARTED, got %r' % (self.argv, line))
+
+    def sethostip(self, hostname, ip):
+        assert(not re.search(b'[^-\w]', hostname))
+        assert(not re.search(b'[^0-9.]', ip))
+        self.pfile.write(b'HOST %s,%s\n' % (hostname, ip))
+        self.pfile.flush()
+
+    def done(self):
+        self.pfile.close()
+        rv = self.p.wait()
+        if rv:
+            raise Fatal('cleanup: %r returned %d' % (self.argv, rv))
+
+
+dnsreqs = {}
+udp_by_src = {}
+
+
+def expire_connections(now, mux):
+    remove = []
+    for chan, timeout in dnsreqs.items():
+        if timeout < now:
+            debug3('expiring dnsreqs channel=%d\n' % chan)
+            remove.append(chan)
+            del mux.channels[chan]
+    for chan in remove:
+        del dnsreqs[chan]
+    debug3('Remaining DNS requests: %d\n' % len(dnsreqs))
+
+    remove = []
+    for peer, (chan, timeout) in udp_by_src.items():
+        if timeout < now:
+            debug3('expiring UDP channel channel=%d peer=%r\n' % (chan, peer))
+            mux.send(chan, ssnet.CMD_UDP_CLOSE, b'')
+            remove.append(peer)
+            del mux.channels[chan]
+    for peer in remove:
+        del udp_by_src[peer]
+    debug3('Remaining UDP channels: %d\n' % len(udp_by_src))
+
+
+def onaccept_tcp(listener, method, mux, handlers):
+    global _extra_fd
+    try:
+        sock, srcip = listener.accept()
+    except socket.error as e:
+        if e.args[0] in [errno.EMFILE, errno.ENFILE]:
+            debug1('Rejected incoming connection: too many open files!\n')
+            # free up an fd so we can eat the connection
+            os.close(_extra_fd)
+            try:
+                sock, srcip = listener.accept()
+                sock.close()
+            finally:
+                _extra_fd = os.open('/dev/null', os.O_RDONLY)
+            return
+        else:
+            raise
+
+    dstip = method.get_tcp_dstip(sock)
+    debug1('Accept TCP: %s:%r -> %s:%r.\n' % (srcip[0], srcip[1],
+                                              dstip[0], dstip[1]))
+    if dstip[1] == sock.getsockname()[1] and islocal(dstip[0], sock.family):
+        debug1("-- ignored: that's my address!\n")
+        sock.close()
+        return
+    chan = mux.next_channel()
+    if not chan:
+        log('warning: too many open channels.  Discarded connection.\n')
+        sock.close()
+        return
+    mux.send(chan, ssnet.CMD_TCP_CONNECT, b'%d,%s,%d' %
+             (sock.family, dstip[0].encode("ASCII"), dstip[1]))
+    outwrap = MuxWrapper(mux, chan)
+    handlers.append(Proxy(SockWrapper(sock, sock), outwrap))
+    expire_connections(time.time(), mux)
+
+
+def udp_done(chan, data, method, sock, dstip):
+    (src, srcport, data) = data.split(b",", 2)
+    srcip = (src, int(srcport))
+    debug3('doing send from %r to %r\n' % (srcip, dstip,))
+    method.send_udp(sock, srcip, dstip, data)
+
+
+def onaccept_udp(listener, method, mux, handlers):
+    now = time.time()
+    t = method.recv_udp(listener, 4096)
+    if t is None:
+        return
+    srcip, dstip, data = t
+    debug1('Accept UDP: %r -> %r.\n' % (srcip, dstip,))
+    if srcip in udp_by_src:
+        chan, timeout = udp_by_src[srcip]
+    else:
+        chan = mux.next_channel()
+        mux.channels[chan] = lambda cmd, data: udp_done(
+            chan, data, method, listener, dstip=srcip)
+        mux.send(chan, ssnet.CMD_UDP_OPEN, b"%d" % listener.family)
+    udp_by_src[srcip] = chan, now + 30
+
+    hdr = b"%s,%d," % (dstip[0].encode("ASCII"), dstip[1])
+    mux.send(chan, ssnet.CMD_UDP_DATA, hdr + data)
+
+    expire_connections(now, mux)
+
+
+def dns_done(chan, data, method, sock, srcip, dstip, mux):
+    debug3('dns_done: channel=%d src=%r dst=%r\n' % (chan, srcip, dstip))
+    del mux.channels[chan]
+    del dnsreqs[chan]
+    method.send_udp(sock, srcip, dstip, data)
+
+
+def ondns(listener, method, mux, handlers):
+    now = time.time()
+    t = method.recv_udp(listener, 4096)
+    if t is None:
+        return
+    srcip, dstip, data = t
+    debug1('DNS request from %r to %r: %d bytes\n' % (srcip, dstip, len(data)))
+    chan = mux.next_channel()
+    dnsreqs[chan] = now + 30
+    mux.send(chan, ssnet.CMD_DNS_REQ, data)
+    mux.channels[chan] = lambda cmd, data: dns_done(
+        chan, data, method, listener, srcip=dstip, dstip=srcip, mux=mux)
+    expire_connections(now, mux)
+
+
+def _main(tcp_listener, udp_listener, fw, ssh_cmd, remotename,
+          python, latency_control,
+          dns_listener, seed_hosts, auto_nets, daemon):
+
+    debug1('Starting client with Python version %s\n'
+           % platform.python_version())
+
+    method = fw.method
+
+    handlers = []
+    if helpers.verbose >= 1:
+        helpers.logprefix = 'c : '
+    else:
+        helpers.logprefix = 'client: '
+    debug1('connecting to server...\n')
+
+    try:
+        (serverproc, serversock) = ssh.connect(
+            ssh_cmd, remotename, python,
+            stderr=ssyslog._p and ssyslog._p.stdin,
+            options=dict(latency_control=latency_control))
+    except socket.error as e:
+        if e.args[0] == errno.EPIPE:
+            raise Fatal("failed to establish ssh session (1)")
+        else:
+            raise
+    mux = Mux(serversock, serversock)
+    handlers.append(mux)
+
+    expected = b'SSHUTTLE0001'
+
+    try:
+        v = 'x'
+        while v and v != b'\0':
+            v = serversock.recv(1)
+        v = 'x'
+        while v and v != b'\0':
+            v = serversock.recv(1)
+        initstring = serversock.recv(len(expected))
+    except socket.error as e:
+        if e.args[0] == errno.ECONNRESET:
+            raise Fatal("failed to establish ssh session (2)")
+        else:
+            raise
+
+    rv = serverproc.poll()
+    if rv:
+        raise Fatal('server died with error code %d' % rv)
+
+    if initstring != expected:
+        raise Fatal('expected server init string %r; got %r'
+                    % (expected, initstring))
+    log('Connected.\n')
+    sys.stdout.flush()
+    if daemon:
+        daemonize()
+        log('daemonizing (%s).\n' % _pidname)
+
+    def onroutes(routestr):
+        if auto_nets:
+            for line in routestr.strip().split(b'\n'):
+                (family, ip, width) = line.split(b',', 2)
+                family = int(family)
+                width = int(width)
+                ip = ip.decode("ASCII")
+                if family == socket.AF_INET6 and tcp_listener.v6 is None:
+                    debug2("Ignored auto net %d/%s/%d\n" % (family, ip, width))
+                if family == socket.AF_INET and tcp_listener.v4 is None:
+                    debug2("Ignored auto net %d/%s/%d\n" % (family, ip, width))
+                else:
+                    debug2("Adding auto net %d/%s/%d\n" % (family, ip, width))
+                    fw.auto_nets.append((family, ip, width))
+
+        # we definitely want to do this *after* starting ssh, or we might end
+        # up intercepting the ssh connection!
+        #
+        # Moreover, now that we have the --auto-nets option, we have to wait
+        # for the server to send us that message anyway.  Even if we haven't
+        # set --auto-nets, we might as well wait for the message first, then
+        # ignore its contents.
+        mux.got_routes = None
+        fw.start()
+    mux.got_routes = onroutes
+
+    def onhostlist(hostlist):
+        debug2('got host list: %r\n' % hostlist)
+        for line in hostlist.strip().split():
+            if line:
+                name, ip = line.split(b',', 1)
+                fw.sethostip(name, ip)
+    mux.got_host_list = onhostlist
+
+    tcp_listener.add_handler(handlers, onaccept_tcp, method, mux)
+
+    if udp_listener:
+        udp_listener.add_handler(handlers, onaccept_udp, method, mux)
+
+    if dns_listener:
+        dns_listener.add_handler(handlers, ondns, method, mux)
+
+    if seed_hosts is not None:
+        debug1('seed_hosts: %r\n' % seed_hosts)
+        mux.send(0, ssnet.CMD_HOST_REQ, str.encode('\n'.join(seed_hosts)))
+
+    while 1:
+        rv = serverproc.poll()
+        if rv:
+            raise Fatal('server died with error code %d' % rv)
+
+        ssnet.runonce(handlers, mux)
+        if latency_control:
+            mux.check_fullness()
+
+
+def main(listenip_v6, listenip_v4,
+         ssh_cmd, remotename, python, latency_control, dns, nslist,
+         method_name, seed_hosts, auto_nets,
+         subnets_include, subnets_exclude, daemon, pidfile):
+
+    if daemon:
+        try:
+            check_daemon(pidfile)
+        except Fatal as e:
+            log("%s\n" % e)
+            return 5
+    debug1('Starting sshuttle proxy.\n')
+
+    fw = FirewallClient(method_name)
+
+    # Get family specific subnet lists
+    if dns:
+        nslist += resolvconf_nameservers()
+
+    subnets = subnets_include + subnets_exclude  # we don't care here
+    subnets_v6 = [i for i in subnets if i[0] == socket.AF_INET6]
+    nslist_v6 = [i for i in nslist if i[0] == socket.AF_INET6]
+    subnets_v4 = [i for i in subnets if i[0] == socket.AF_INET]
+    nslist_v4 = [i for i in nslist if i[0] == socket.AF_INET]
+
+    # Check features available
+    avail = fw.method.get_supported_features()
+    required = Features()
+
+    if listenip_v6 == "auto":
+        if avail.ipv6:
+            listenip_v6 = ('::1', 0)
+        else:
+            listenip_v6 = None
+
+    required.ipv6 = len(subnets_v6) > 0 or len(nslist_v6) > 0 \
+        or listenip_v6 is not None
+    required.udp = avail.udp
+    required.dns = len(nslist) > 0
+
+    fw.method.assert_features(required)
+
+    if required.ipv6 and listenip_v6 is None:
+        raise Fatal("IPv6 required but not listening.")
+
+    # display features enabled
+    debug1("IPv6 enabled: %r\n" % required.ipv6)
+    debug1("UDP enabled: %r\n" % required.udp)
+    debug1("DNS enabled: %r\n" % required.dns)
+
+    # bind to required ports
+    if listenip_v4 == "auto":
+        listenip_v4 = ('127.0.0.1', 0)
+
+    if listenip_v6 and listenip_v6[1] and listenip_v4 and listenip_v4[1]:
+        # if both ports given, no need to search for a spare port
+        ports = [0, ]
+    else:
+        # if at least one port missing, we have to search
+        ports = range(12300, 9000, -1)
+
+    # search for free ports and try to bind
+    last_e = None
+    redirectport_v6 = 0
+    redirectport_v4 = 0
+    bound = False
+    debug2('Binding redirector:')
+    for port in ports:
+        debug2(' %d' % port)
+        tcp_listener = MultiListener()
+
+        if required.udp:
+            udp_listener = MultiListener(socket.SOCK_DGRAM)
+        else:
+            udp_listener = None
+
+        if listenip_v6 and listenip_v6[1]:
+            lv6 = listenip_v6
+            redirectport_v6 = lv6[1]
+        elif listenip_v6:
+            lv6 = (listenip_v6[0], port)
+            redirectport_v6 = port
+        else:
+            lv6 = None
+            redirectport_v6 = 0
+
+        if listenip_v4 and listenip_v4[1]:
+            lv4 = listenip_v4
+            redirectport_v4 = lv4[1]
+        elif listenip_v4:
+            lv4 = (listenip_v4[0], port)
+            redirectport_v4 = port
+        else:
+            lv4 = None
+            redirectport_v4 = 0
+
+        try:
+            tcp_listener.bind(lv6, lv4)
+            if udp_listener:
+                udp_listener.bind(lv6, lv4)
+            bound = True
+            break
+        except socket.error as e:
+            if e.errno == errno.EADDRINUSE:
+                last_e = e
+            else:
+                raise e
+
+    debug2('\n')
+    if not bound:
+        assert(last_e)
+        raise last_e
+    tcp_listener.listen(10)
+    tcp_listener.print_listening("TCP redirector")
+    if udp_listener:
+        udp_listener.print_listening("UDP redirector")
+
+    bound = False
+    if required.dns:
+        # search for spare port for DNS
+        debug2('Binding DNS:')
+        ports = range(12300, 9000, -1)
+        for port in ports:
+            debug2(' %d' % port)
+            dns_listener = MultiListener(socket.SOCK_DGRAM)
+
+            if listenip_v6:
+                lv6 = (listenip_v6[0], port)
+                dnsport_v6 = port
+            else:
+                lv6 = None
+                dnsport_v6 = 0
+
+            if listenip_v4:
+                lv4 = (listenip_v4[0], port)
+                dnsport_v4 = port
+            else:
+                lv4 = None
+                dnsport_v4 = 0
+
+            try:
+                dns_listener.bind(lv6, lv4)
+                bound = True
+                break
+            except socket.error as e:
+                if e.errno == errno.EADDRINUSE:
+                    last_e = e
+                else:
+                    raise e
+        debug2('\n')
+        dns_listener.print_listening("DNS")
+        if not bound:
+            assert(last_e)
+            raise last_e
+    else:
+        dnsport_v6 = 0
+        dnsport_v4 = 0
+        dns_listener = None
+
+    # Last minute sanity checks.
+    # These should never fail.
+    # If these do fail, something is broken above.
+    if len(subnets_v6) > 0:
+        assert required.ipv6
+        if redirectport_v6 == 0:
+            raise Fatal("IPv6 subnets defined but not listening")
+
+    if len(nslist_v6) > 0:
+        assert required.dns
+        assert required.ipv6
+        if dnsport_v6 == 0:
+            raise Fatal("IPv6 ns servers defined but not listening")
+
+    if len(subnets_v4) > 0:
+        if redirectport_v4 == 0:
+            raise Fatal("IPv4 subnets defined but not listening")
+
+    if len(nslist_v4) > 0:
+        if dnsport_v4 == 0:
+            raise Fatal("IPv4 ns servers defined but not listening")
+
+    # setup method specific stuff on listeners
+    fw.method.setup_tcp_listener(tcp_listener)
+    if udp_listener:
+        fw.method.setup_udp_listener(udp_listener)
+    if dns_listener:
+        fw.method.setup_udp_listener(dns_listener)
+
+    # start the firewall
+    fw.setup(subnets_include, subnets_exclude, nslist,
+             redirectport_v6, redirectport_v4, dnsport_v6, dnsport_v4,
+             required.udp)
+
+    # start the client process
+    try:
+        return _main(tcp_listener, udp_listener, fw, ssh_cmd, remotename,
+                     python, latency_control, dns_listener,
+                     seed_hosts, auto_nets, daemon)
+    finally:
+        try:
+            if daemon:
+                # it's not our child anymore; can't waitpid
+                fw.p.returncode = 0
+            fw.done()
+        finally:
+            if daemon:
+                daemon_cleanup()

sshuttle/cmdline.py

@@ -0,0 +1,240 @@
+import sys
+import re
+import socket
+import sshuttle.helpers as helpers
+import sshuttle.options as options
+import sshuttle.client as client
+import sshuttle.firewall as firewall
+import sshuttle.hostwatch as hostwatch
+import sshuttle.ssyslog as ssyslog
+from sshuttle.helpers import family_ip_tuple, log, Fatal
+
+
+# 1.2.3.4/5 or just 1.2.3.4
+def parse_subnet4(s):
+    m = re.match(r'(\d+)(?:\.(\d+)\.(\d+)\.(\d+))?(?:/(\d+))?$', s)
+    if not m:
+        raise Fatal('%r is not a valid IP subnet format' % s)
+    (a, b, c, d, width) = m.groups()
+    (a, b, c, d) = (int(a or 0), int(b or 0), int(c or 0), int(d or 0))
+    if width is None:
+        width = 32
+    else:
+        width = int(width)
+    if a > 255 or b > 255 or c > 255 or d > 255:
+        raise Fatal('%d.%d.%d.%d has numbers > 255' % (a, b, c, d))
+    if width > 32:
+        raise Fatal('*/%d is greater than the maximum of 32' % width)
+    return(socket.AF_INET, '%d.%d.%d.%d' % (a, b, c, d), width)
+
+
+# 1:2::3/64 or just 1:2::3
+def parse_subnet6(s):
+    m = re.match(r'(?:([a-fA-F\d:]+))?(?:/(\d+))?$', s)
+    if not m:
+        raise Fatal('%r is not a valid IP subnet format' % s)
+    (net, width) = m.groups()
+    if width is None:
+        width = 128
+    else:
+        width = int(width)
+    if width > 128:
+        raise Fatal('*/%d is greater than the maximum of 128' % width)
+    return(socket.AF_INET6, net, width)
+
+
+# Subnet file, supporting empty lines and hash-started comment lines
+def parse_subnet_file(s):
+    try:
+        handle = open(s, 'r')
+    except OSError:
+        raise Fatal('Unable to open subnet file: %s' % s)
+
+    raw_config_lines = handle.readlines()
+    config_lines = []
+    for line_no, line in enumerate(raw_config_lines):
+        line = line.strip()
+        if len(line) == 0:
+            continue
+        if line[0] == '#':
+            continue
+        config_lines.append(line)
+
+    return config_lines
+
+
+# list of:
+# 1.2.3.4/5 or just 1.2.3.4
+# 1:2::3/64 or just 1:2::3
+def parse_subnets(subnets_str):
+    subnets = []
+    for s in subnets_str:
+        if ':' in s:
+            subnet = parse_subnet6(s)
+        else:
+            subnet = parse_subnet4(s)
+        subnets.append(subnet)
+    return subnets
+
+
+# 1.2.3.4:567 or just 1.2.3.4 or just 567
+def parse_ipport4(s):
+    s = str(s)
+    m = re.match(r'(?:(\d+)\.(\d+)\.(\d+)\.(\d+))?(?::)?(?:(\d+))?$', s)
+    if not m:
+        raise Fatal('%r is not a valid IP:port format' % s)
+    (a, b, c, d, port) = m.groups()
+    (a, b, c, d, port) = (int(a or 0), int(b or 0), int(c or 0), int(d or 0),
+                          int(port or 0))
+    if a > 255 or b > 255 or c > 255 or d > 255:
+        raise Fatal('%d.%d.%d.%d has numbers > 255' % (a, b, c, d))
+    if port > 65535:
+        raise Fatal('*:%d is greater than the maximum of 65535' % port)
+    if a is None:
+        a = b = c = d = 0
+    return ('%d.%d.%d.%d' % (a, b, c, d), port)
+
+
+# [1:2::3]:456 or [1:2::3] or 456
+def parse_ipport6(s):
+    s = str(s)
+    m = re.match(r'(?:\[([^]]*)])?(?::)?(?:(\d+))?$', s)
+    if not m:
+        raise Fatal('%s is not a valid IP:port format' % s)
+    (ip, port) = m.groups()
+    (ip, port) = (ip or '::', int(port or 0))
+    return (ip, port)
+
+
+def parse_list(list):
+    return re.split(r'[\s,]+', list.strip()) if list else []
+
+
+optspec = """
+sshuttle [-l [ip:]port] [-r [username@]sshserver[:port]] <subnets...>
+sshuttle --firewall <port> <subnets...>
+sshuttle --hostwatch
+--
+l,listen=  transproxy to this ip address and port number
+H,auto-hosts scan for remote hostnames and update local /etc/hosts
+N,auto-nets  automatically determine subnets to route
+dns        capture local DNS requests and forward to the remote DNS server
+ns-hosts=  capture and forward remote DNS requests to the following servers
+method=    auto, nat, tproxy or pf
+python=    path to python interpreter on the remote server
+r,remote=  ssh hostname (and optional username) of remote sshuttle server
+x,exclude= exclude this subnet (can be used more than once)
+X,exclude-from=  exclude the subnets in a file (whitespace separated)
+v,verbose  increase debug message verbosity
+V,version  print the sshuttle version number and exit
+e,ssh-cmd= the command to use to connect to the remote [ssh]
+seed-hosts= with -H, use these hostnames for initial scan (comma-separated)
+no-latency-control  sacrifice latency to improve bandwidth benchmarks
+wrap=      restart counting channel numbers after this number (for testing)
+disable-ipv6 disables ipv6 support
+D,daemon   run in the background as a daemon
+s,subnets= file where the subnets are stored, instead of on the command line
+syslog     send log messages to syslog (default if you use --daemon)
+pidfile=   pidfile name (only if using --daemon) [./sshuttle.pid]
+server     (internal use only)
+firewall   (internal use only)
+hostwatch  (internal use only)
+"""
+
+
+def main():
+    o = options.Options(optspec)
+    (opt, flags, extra) = o.parse(sys.argv[1:])
+
+    if opt.version:
+        from sshuttle.version import version
+        print(version)
+        return 0
+    if opt.daemon:
+        opt.syslog = 1
+    if opt.wrap:
+        import sshuttle.ssnet as ssnet
+        ssnet.MAX_CHANNEL = int(opt.wrap)
+    helpers.verbose = opt.verbose or 0
+
+    try:
+        if opt.firewall:
+            if len(extra) != 0:
+                o.fatal('exactly zero arguments expected')
+            return firewall.main(opt.method, opt.syslog)
+        elif opt.hostwatch:
+            return hostwatch.hw_main(extra)
+        else:
+            if len(extra) < 1 and not opt.auto_nets and not opt.subnets:
+                o.fatal('at least one subnet, subnet file, or -N expected')
+            includes = extra
+            excludes = ['127.0.0.0/8']
+            for k, v in flags:
+                if k in ('-x', '--exclude'):
+                    excludes.append(v)
+                if k in ('-X', '--exclude-from'):
+                    excludes += open(v).read().split()
+            remotename = opt.remote
+            if remotename == '' or remotename == '-':
+                remotename = None
+            nslist = [family_ip_tuple(ns) for ns in parse_list(opt.ns_hosts)]
+            if opt.seed_hosts and not opt.auto_hosts:
+                o.fatal('--seed-hosts only works if you also use -H')
+            if opt.seed_hosts:
+                sh = re.split(r'[\s,]+', (opt.seed_hosts or "").strip())
+            elif opt.auto_hosts:
+                sh = []
+            else:
+                sh = None
+            if opt.subnets:
+                includes = parse_subnet_file(opt.subnets)
+            if not opt.method:
+                method_name = "auto"
+            elif opt.method in ["auto", "nat", "tproxy", "pf"]:
+                method_name = opt.method
+            else:
+                o.fatal("method_name %s not supported" % opt.method)
+            if opt.listen:
+                ipport_v6 = None
+                ipport_v4 = None
+                list = opt.listen.split(",")
+                for ip in list:
+                    if '[' in ip and ']' in ip:
+                        ipport_v6 = parse_ipport6(ip)
+                    else:
+                        ipport_v4 = parse_ipport4(ip)
+            else:
+                # parse_ipport4('127.0.0.1:0')
+                ipport_v4 = "auto"
+                # parse_ipport6('[::1]:0')
+                ipport_v6 = "auto" if not opt.disable_ipv6 else None
+            if opt.syslog:
+                ssyslog.start_syslog()
+                ssyslog.stderr_to_syslog()
+            return_code = client.main(ipport_v6, ipport_v4,
+                                      opt.ssh_cmd,
+                                      remotename,
+                                      opt.python,
+                                      opt.latency_control,
+                                      opt.dns,
+                                      nslist,
+                                      method_name,
+                                      sh,
+                                      opt.auto_nets,
+                                      parse_subnets(includes),
+                                      parse_subnets(excludes),
+                                      opt.daemon, opt.pidfile)
+
+            if return_code == 0:
+                log('Normal exit code, exiting...')
+            else:
+                log('Abnormal exit code detected, failing...' % return_code)
+            return return_code
+
+    except Fatal as e:
+        log('fatal: %s\n' % e)
+        return 99
+    except KeyboardInterrupt:
+        log('\n')
+        log('Keyboard interrupt: exiting.\n')
+        return 1

sshuttle/firewall.py

@@ -0,0 +1,264 @@
+import errno
+import socket
+import signal
+import sshuttle.ssyslog as ssyslog
+import sys
+import os
+import platform
+import traceback
+from sshuttle.helpers import debug1, debug2, Fatal
+from sshuttle.methods import get_auto_method, get_method
+
+HOSTSFILE = '/etc/hosts'
+
+
+def rewrite_etc_hosts(hostmap, port):
+    BAKFILE = '%s.sbak' % HOSTSFILE
+    APPEND = '# sshuttle-firewall-%d AUTOCREATED' % port
+    old_content = ''
+    st = None
+    try:
+        old_content = open(HOSTSFILE).read()
+        st = os.stat(HOSTSFILE)
+    except IOError as e:
+        if e.errno == errno.ENOENT:
+            pass
+        else:
+            raise
+    if old_content.strip() and not os.path.exists(BAKFILE):
+        os.link(HOSTSFILE, BAKFILE)
+    tmpname = "%s.%d.tmp" % (HOSTSFILE, port)
+    f = open(tmpname, 'w')
+    for line in old_content.rstrip().split('\n'):
+        if line.find(APPEND) >= 0:
+            continue
+        f.write('%s\n' % line)
+    for (name, ip) in sorted(hostmap.items()):
+        f.write('%-30s %s\n' % ('%s %s' % (ip, name), APPEND))
+    f.close()
+
+    if st is not None:
+        os.chown(tmpname, st.st_uid, st.st_gid)
+        os.chmod(tmpname, st.st_mode)
+    else:
+        os.chown(tmpname, 0, 0)
+        os.chmod(tmpname, 0o600)
+    os.rename(tmpname, HOSTSFILE)
+
+
+def restore_etc_hosts(port):
+    rewrite_etc_hosts({}, port)
+
+
+# Isolate function that needs to be replaced for tests
+def setup_daemon():
+    if os.getuid() != 0:
+        raise Fatal('you must be root (or enable su/sudo) to set the firewall')
+
+    # don't disappear if our controlling terminal or stdout/stderr
+    # disappears; we still have to clean up.
+    signal.signal(signal.SIGHUP, signal.SIG_IGN)
+    signal.signal(signal.SIGPIPE, signal.SIG_IGN)
+    signal.signal(signal.SIGTERM, signal.SIG_IGN)
+    signal.signal(signal.SIGINT, signal.SIG_IGN)
+
+    # ctrl-c shouldn't be passed along to me.  When the main sshuttle dies,
+    # I'll die automatically.
+    os.setsid()
+
+    # because of limitations of the 'su' command, the *real* stdin/stdout
+    # are both attached to stdout initially.  Clone stdout into stdin so we
+    # can read from it.
+    os.dup2(1, 0)
+
+    return sys.stdin, sys.stdout
+
+
+# This is some voodoo for setting up the kernel's transparent
+# proxying stuff.  If subnets is empty, we just delete our sshuttle rules;
+# otherwise we delete it, then make them from scratch.
+#
+# This code is supposed to clean up after itself by deleting its rules on
+# exit.  In case that fails, it's not the end of the world; future runs will
+# supercede it in the transproxy list, at least, so the leftover rules
+# are hopefully harmless.
+def main(method_name, syslog):
+    stdin, stdout = setup_daemon()
+    hostmap = {}
+
+    debug1('firewall manager: Starting firewall with Python version %s\n'
+           % platform.python_version())
+
+    if method_name == "auto":
+        method = get_auto_method()
+    else:
+        method = get_method(method_name)
+
+    if syslog:
+        ssyslog.start_syslog()
+        ssyslog.stderr_to_syslog()
+
+    debug1('firewall manager: ready method name %s.\n' % method.name)
+    stdout.write('READY %s\n' % method.name)
+    stdout.flush()
+
+    # we wait until we get some input before creating the rules.  That way,
+    # sshuttle can launch us as early as possible (and get sudo password
+    # authentication as early in the startup process as possible).
+    line = stdin.readline(128)
+    if not line:
+        return  # parent died; nothing to do
+
+    subnets = []
+    if line != 'ROUTES\n':
+        raise Fatal('firewall: expected ROUTES but got %r' % line)
+    while 1:
+        line = stdin.readline(128)
+        if not line:
+            raise Fatal('firewall: expected route but got %r' % line)
+        elif line.startswith("NSLIST\n"):
+            break
+        try:
+            (family, width, exclude, ip) = line.strip().split(',', 3)
+        except:
+            raise Fatal('firewall: expected route or NSLIST but got %r' % line)
+        subnets.append((int(family), int(width), bool(int(exclude)), ip))
+    debug2('firewall manager: Got subnets: %r\n' % subnets)
+
+    nslist = []
+    if line != 'NSLIST\n':
+        raise Fatal('firewall: expected NSLIST but got %r' % line)
+    while 1:
+        line = stdin.readline(128)
+        if not line:
+            raise Fatal('firewall: expected nslist but got %r' % line)
+        elif line.startswith("PORTS "):
+            break
+        try:
+            (family, ip) = line.strip().split(',', 1)
+        except:
+            raise Fatal('firewall: expected nslist or PORTS but got %r' % line)
+        nslist.append((int(family), ip))
+        debug2('firewall manager: Got partial nslist: %r\n' % nslist)
+    debug2('firewall manager: Got nslist: %r\n' % nslist)
+
+    if not line.startswith('PORTS '):
+        raise Fatal('firewall: expected PORTS but got %r' % line)
+    _, _, ports = line.partition(" ")
+    ports = ports.split(",")
+    if len(ports) != 4:
+        raise Fatal('firewall: expected 4 ports but got %n' % len(ports))
+    port_v6 = int(ports[0])
+    port_v4 = int(ports[1])
+    dnsport_v6 = int(ports[2])
+    dnsport_v4 = int(ports[3])
+
+    assert(port_v6 >= 0)
+    assert(port_v6 <= 65535)
+    assert(port_v4 >= 0)
+    assert(port_v4 <= 65535)
+    assert(dnsport_v6 >= 0)
+    assert(dnsport_v6 <= 65535)
+    assert(dnsport_v4 >= 0)
+    assert(dnsport_v4 <= 65535)
+
+    debug2('firewall manager: Got ports: %d,%d,%d,%d\n'
+           % (port_v6, port_v4, dnsport_v6, dnsport_v4))
+
+    line = stdin.readline(128)
+    if not line:
+        raise Fatal('firewall: expected GO but got %r' % line)
+    elif not line.startswith("GO "):
+        raise Fatal('firewall: expected GO but got %r' % line)
+
+    _, _, udp = line.partition(" ")
+    udp = bool(int(udp))
+    debug2('firewall manager: Got udp: %r\n' % udp)
+
+    subnets_v6 = [i for i in subnets if i[0] == socket.AF_INET6]
+    nslist_v6 = [i for i in nslist if i[0] == socket.AF_INET6]
+    subnets_v4 = [i for i in subnets if i[0] == socket.AF_INET]
+    nslist_v4 = [i for i in nslist if i[0] == socket.AF_INET]
+
+    try:
+        debug1('firewall manager: setting up.\n')
+
+        if len(subnets_v6) > 0 or len(nslist_v6) > 0:
+            debug2('firewall manager: setting up IPv6.\n')
+            method.setup_firewall(
+                port_v6, dnsport_v6, nslist_v6,
+                socket.AF_INET6, subnets_v6, udp)
+
+        if len(subnets_v4) > 0 or len(nslist_v4) > 0:
+            debug2('firewall manager: setting up IPv4.\n')
+            method.setup_firewall(
+                port_v4, dnsport_v4, nslist_v4,
+                socket.AF_INET, subnets_v4, udp)
+
+        stdout.write('STARTED\n')
+
+        try:
+            stdout.flush()
+        except IOError:
+            # the parent process died for some reason; he's surely been loud
+            # enough, so no reason to report another error
+            return
+
+        # Now we wait until EOF or any other kind of exception.  We need
+        # to stay running so that we don't need a *second* password
+        # authentication at shutdown time - that cleanup is important!
+        while 1:
+            line = stdin.readline(128)
+            if line.startswith('HOST '):
+                (name, ip) = line[5:].strip().split(',', 1)
+                hostmap[name] = ip
+                debug2('firewall manager: setting up /etc/hosts.\n')
+                rewrite_etc_hosts(hostmap, port_v6 or port_v4)
+            elif line:
+                if not method.firewall_command(line):
+                    raise Fatal('firewall: expected command, got %r' % line)
+            else:
+                break
+    finally:
+        try:
+            debug1('firewall manager: undoing changes.\n')
+        except:
+            pass
+
+        try:
+            if len(subnets_v6) > 0 or len(nslist_v6) > 0:
+                debug2('firewall manager: undoing IPv6 changes.\n')
+                method.restore_firewall(port_v6, socket.AF_INET6, udp)
+        except:
+            try:
+                debug1("firewall manager: "
+                       "Error trying to undo IPv6 firewall.\n")
+                for line in traceback.format_exc().splitlines():
+                    debug1("---> %s\n" % line)
+            except:
+                pass
+
+        try:
+            if len(subnets_v4) > 0 or len(nslist_v4) > 0:
+                debug2('firewall manager: undoing IPv4 changes.\n')
+                method.restore_firewall(port_v4, socket.AF_INET, udp)
+        except:
+            try:
+                debug1("firewall manager: "
+                       "Error trying to undo IPv4 firewall.\n")
+                for line in traceback.format_exc().splitlines():
+                    debug1("firewall manager: ---> %s\n" % line)
+            except:
+                pass
+
+        try:
+            debug2('firewall manager: undoing /etc/hosts changes.\n')
+            restore_etc_hosts(port_v6 or port_v4)
+        except:
+            try:
+                debug1("firewall manager: "
+                       "Error trying to undo /etc/hosts changes.\n")
+                for line in traceback.format_exc().splitlines():
+                    debug1("firewall manager: ---> %s\n" % line)
+            except:
+                pass

sshuttle/helpers.py

@@ -1,26 +1,40 @@
-import sys, os, socket
+import sys
+import socket
+import errno
 
 logprefix = ''
 verbose = 0
 
+
 def log(s):
+    global logprefix
     try:
         sys.stdout.flush()
-        sys.stderr.write(logprefix + s)
+        if s.find("\n") != -1:
+            prefix = logprefix
+            s = s.rstrip("\n")
+            for line in s.split("\n"):
+                sys.stderr.write(prefix + line + "\n")
+                prefix = "---> "
+        else:
+            sys.stderr.write(logprefix + s)
         sys.stderr.flush()
     except IOError:
         # this could happen if stderr gets forcibly disconnected, eg. because
         # our tty closes.  That sucks, but it's no reason to abort the program.
         pass
 
+
 def debug1(s):
     if verbose >= 1:
         log(s)
 
+
 def debug2(s):
     if verbose >= 2:
         log(s)
 
+
 def debug3(s):
     if verbose >= 3:
         log(s)
@@ -30,19 +44,12 @@ class Fatal(Exception):
     pass
 
 
-def list_contains_any(l, sub):
-    for i in sub:
-        if i in l:
-            return True
-    return False
-
-
 def resolvconf_nameservers():
     l = []
     for line in open('/etc/resolv.conf'):
         words = line.lower().split()
         if len(words) >= 2 and words[0] == 'nameserver':
-            l.append(words[1])
+            l.append(family_ip_tuple(words[1]))
     return l
 
 
@@ -55,15 +62,15 @@ def resolvconf_random_nameserver():
             random.shuffle(l)
         return l[0]
     else:
-        return '127.0.0.1'
-    
+        return (socket.AF_INET, '127.0.0.1')
 
-def islocal(ip):
-    sock = socket.socket()
+
+def islocal(ip, family):
+    sock = socket.socket(family)
     try:
         try:
             sock.bind((ip, 0))
-        except socket.error, e:
+        except socket.error as e:
             if e.args[0] == errno.EADDRNOTAVAIL:
                 return False  # not a local IP
             else:
@@ -73,3 +80,17 @@ def islocal(ip):
     return True  # it's a local IP, or there would have been an error
 
 
+def family_ip_tuple(ip):
+    if ':' in ip:
+        return (socket.AF_INET6, ip)
+    else:
+        return (socket.AF_INET, ip)
+
+
+def family_to_string(family):
+    if family == socket.AF_INET6:
+        return "AF_INET6"
+    elif family == socket.AF_INET:
+        return "AF_INET"
+    else:
+        return str(family)

sshuttle/hostwatch.py

@@ -1,12 +1,19 @@
-import time, socket, re, select, errno
-if not globals().get('skip_imports'):
-    import compat.ssubprocess as ssubprocess
-    import helpers
-    from helpers import *
+import time
+import socket
+import re
+import select
+import errno
+import os
+import sys
+import platform
 
-POLL_TIME = 60*15
+import subprocess as ssubprocess
+import sshuttle.helpers as helpers
+from sshuttle.helpers import log, debug1, debug2, debug3
+
+POLL_TIME = 60 * 15
 NETSTAT_POLL_TIME = 30
-CACHEFILE=os.path.expanduser('~/.sshuttle.hosts')
+CACHEFILE = os.path.expanduser('~/.sshuttle.hosts')
 
 
 _nmb_ok = True
@@ -15,7 +22,7 @@ hostnames = {}
 queue = {}
 try:
     null = open('/dev/null', 'wb')
-except IOError, e:
+except IOError as e:
     log('warning: %s\n' % e)
     null = os.popen("sh -c 'while read x; do :; done'", 'wb', 4096)
 
@@ -28,9 +35,10 @@ def write_host_cache():
     tmpname = '%s.%d.tmp' % (CACHEFILE, os.getpid())
     try:
         f = open(tmpname, 'wb')
-        for name,ip in sorted(hostnames.items()):
-            f.write('%s,%s\n' % (name, ip))
+        for name, ip in sorted(hostnames.items()):
+            f.write(('%s,%s\n' % (name, ip)).encode("ASCII"))
         f.close()
+        os.chmod(tmpname, 0o600)
         os.rename(tmpname, CACHEFILE)
     finally:
         try:
@@ -42,7 +50,7 @@ def write_host_cache():
 def read_host_cache():
     try:
         f = open(CACHEFILE)
-    except IOError, e:
+    except IOError as e:
         if e.errno == errno.ENOENT:
             return
         else:
@@ -50,18 +58,18 @@ def read_host_cache():
     for line in f:
         words = line.strip().split(',')
         if len(words) == 2:
-            (name,ip) = words
+            (name, ip) = words
             name = re.sub(r'[^-\w]', '-', name).strip()
             ip = re.sub(r'[^0-9.]', '', ip).strip()
             if name and ip:
                 found_host(name, ip)
-                
+
 
 def found_host(hostname, ip):
     hostname = re.sub(r'\..*', '', hostname)
     hostname = re.sub(r'[^-\w]', '_', hostname)
-    if (ip.startswith('127.') or ip.startswith('255.') 
-        or hostname == 'localhost'):
+    if (ip.startswith('127.') or ip.startswith('255.')
+            or hostname == 'localhost'):
         return
     oldip = hostnames.get(hostname)
     if oldip != ip:
@@ -94,7 +102,7 @@ def _check_revdns(ip):
         debug3('<    %s\n' % r[0])
         check_host(r[0])
         found_host(r[0], ip)
-    except socket.herror, e:
+    except socket.herror:
         pass
 
 
@@ -105,7 +113,7 @@ def _check_dns(hostname):
         debug3('<    %s\n' % ip)
         check_host(ip)
         found_host(hostname, ip)
-    except socket.gaierror, e:
+    except socket.gaierror:
         pass
 
 
@@ -114,16 +122,16 @@ def _check_netstat():
     argv = ['netstat', '-n']
     try:
         p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, stderr=null)
-        content = p.stdout.read()
+        content = p.stdout.read().decode("ASCII")
         p.wait()
-    except OSError, e:
+    except OSError as e:
         log('%r failed: %r\n' % (argv, e))
         return
 
     for ip in re.findall(r'\d+\.\d+\.\d+\.\d+', content):
         debug3('<    %s\n' % ip)
         check_host(ip)
-        
+
 
 def _check_smb(hostname):
     return
@@ -136,7 +144,7 @@ def _check_smb(hostname):
         p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, stderr=null)
         lines = p.stdout.readlines()
         p.wait()
-    except OSError, e:
+    except OSError as e:
         log('%r failed: %r\n' % (argv, e))
         _smb_ok = False
         return
@@ -187,13 +195,13 @@ def _check_nmb(hostname, is_workgroup, is_master):
     global _nmb_ok
     if not _nmb_ok:
         return
-    argv = ['nmblookup'] + ['-M']*is_master + ['--', hostname]
+    argv = ['nmblookup'] + ['-M'] * is_master + ['--', hostname]
     debug2(' > n%d%d: %s\n' % (is_workgroup, is_master, hostname))
     try:
         p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, stderr=null)
         lines = p.stdout.readlines()
         rv = p.wait()
-    except OSError, e:
+    except OSError as e:
         log('%r failed: %r\n' % (argv, e))
         _nmb_ok = False
         return
@@ -228,13 +236,13 @@ def check_workgroup(hostname):
 
 
 def _enqueue(op, *args):
-    t = (op,args)
-    if queue.get(t) == None:
+    t = (op, args)
+    if queue.get(t) is None:
         queue[t] = 0
 
 
 def _stdin_still_ok(timeout):
-    r,w,x = select.select([sys.stdin.fileno()], [], [], timeout)
+    r, w, x = select.select([sys.stdin.fileno()], [], [], timeout)
     if r:
         b = os.read(sys.stdin.fileno(), 4096)
         if not b:
@@ -248,8 +256,11 @@ def hw_main(seed_hosts):
     else:
         helpers.logprefix = 'hostwatch: '
 
+    debug1('Starting hostwatch with Python version %s\n'
+           % platform.python_version())
+
     read_host_cache()
-        
+
     _enqueue(_check_etc_hosts)
     _enqueue(_check_netstat)
     check_host('localhost')
@@ -261,8 +272,8 @@ def hw_main(seed_hosts):
 
     while 1:
         now = time.time()
-        for t,last_polled in queue.items():
-            (op,args) = t
+        for t, last_polled in list(queue.items()):
+            (op, args) = t
             if not _stdin_still_ok(0):
                 break
             maxtime = POLL_TIME
@@ -275,7 +286,7 @@ def hw_main(seed_hosts):
                 sys.stdout.flush()
             except IOError:
                 break
-                
+
         # FIXME: use a smarter timeout based on oldest last_polled
         if not _stdin_still_ok(1):
             break

sshuttle/linux.py

@@ -0,0 +1,62 @@
+import socket
+import subprocess as ssubprocess
+from sshuttle.helpers import log, debug1, Fatal, family_to_string
+
+
+def nonfatal(func, *args):
+    try:
+        func(*args)
+    except Fatal as e:
+        log('error: %s\n' % e)
+
+
+def ipt_chain_exists(family, table, name):
+    if family == socket.AF_INET6:
+        cmd = 'ip6tables'
+    elif family == socket.AF_INET:
+        cmd = 'iptables'
+    else:
+        raise Exception('Unsupported family "%s"' % family_to_string(family))
+    argv = [cmd, '-t', table, '-nL']
+    p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE)
+    for line in p.stdout:
+        if line.startswith(b'Chain %s ' % name.encode("ASCII")):
+            return True
+    rv = p.wait()
+    if rv:
+        raise Fatal('%r returned %d' % (argv, rv))
+
+
+def ipt(family, table, *args):
+    if family == socket.AF_INET6:
+        argv = ['ip6tables', '-t', table] + list(args)
+    elif family == socket.AF_INET:
+        argv = ['iptables', '-t', table] + list(args)
+    else:
+        raise Exception('Unsupported family "%s"' % family_to_string(family))
+    debug1('>> %s\n' % ' '.join(argv))
+    rv = ssubprocess.call(argv)
+    if rv:
+        raise Fatal('%r returned %d' % (argv, rv))
+
+
+_no_ttl_module = False
+
+
+def ipt_ttl(family, *args):
+    global _no_ttl_module
+    if not _no_ttl_module:
+        # we avoid infinite loops by generating server-side connections
+        # with ttl 42.  This makes the client side not recapture those
+        # connections, in case client == server.
+        try:
+            argsplus = list(args) + ['-m', 'ttl', '!', '--ttl', '42']
+            ipt(family, *argsplus)
+        except Fatal:
+            ipt(family, *args)
+            # we only get here if the non-ttl attempt succeeds
+            log('sshuttle: warning: your iptables is missing '
+                'the ttl module.\n')
+            _no_ttl_module = True
+    else:
+        ipt(family, *args)

sshuttle/methods/__init__.py

@@ -0,0 +1,105 @@
+import os
+import importlib
+import socket
+import struct
+import errno
+from sshuttle.helpers import Fatal, debug3
+
+
+def original_dst(sock):
+    try:
+        SO_ORIGINAL_DST = 80
+        SOCKADDR_MIN = 16
+        sockaddr_in = sock.getsockopt(socket.SOL_IP,
+                                      SO_ORIGINAL_DST, SOCKADDR_MIN)
+        (proto, port, a, b, c, d) = struct.unpack('!HHBBBB', sockaddr_in[:8])
+        # FIXME: decoding is IPv4 only.
+        assert(socket.htons(proto) == socket.AF_INET)
+        ip = '%d.%d.%d.%d' % (a, b, c, d)
+        return (ip, port)
+    except socket.error as e:
+        if e.args[0] == errno.ENOPROTOOPT:
+            return sock.getsockname()
+        raise
+
+
+class Features(object):
+    pass
+
+
+class BaseMethod(object):
+    def __init__(self, name):
+        self.firewall = None
+        self.name = name
+
+    def set_firewall(self, firewall):
+        self.firewall = firewall
+
+    def get_supported_features(self):
+        result = Features()
+        result.ipv6 = False
+        result.udp = False
+        result.dns = True
+        return result
+
+    def get_tcp_dstip(self, sock):
+        return original_dst(sock)
+
+    def recv_udp(self, udp_listener, bufsize):
+        debug3('Accept UDP using recvfrom.\n')
+        data, srcip = udp_listener.recvfrom(bufsize)
+        return (srcip, None, data)
+
+    def send_udp(self, sock, srcip, dstip, data):
+        if srcip is not None:
+            Fatal("Method %s send_udp does not support setting srcip to %r"
+                  % (self.name, srcip))
+        sock.sendto(data, dstip)
+
+    def setup_tcp_listener(self, tcp_listener):
+        pass
+
+    def setup_udp_listener(self, udp_listener):
+        pass
+
+    def assert_features(self, features):
+        avail = self.get_supported_features()
+        for key in ["udp", "dns", "ipv6"]:
+            if getattr(features, key) and not getattr(avail, key):
+                raise Fatal(
+                    "Feature %s not supported with method %s.\n" %
+                    (key, self.name))
+
+    def setup_firewall(self, port, dnsport, nslist, family, subnets, udp):
+        raise NotImplementedError()
+
+    def restore_firewall(self, port, family, udp):
+        raise NotImplementedError()
+
+    def firewall_command(self, line):
+        return False
+
+
+def _program_exists(name):
+    paths = (os.getenv('PATH') or os.defpath).split(os.pathsep)
+    for p in paths:
+        fn = '%s/%s' % (p, name)
+        if os.path.exists(fn):
+            return not os.path.isdir(fn) and os.access(fn, os.X_OK)
+
+
+def get_method(method_name):
+    module = importlib.import_module("sshuttle.methods.%s" % method_name)
+    return module.Method(method_name)
+
+
+def get_auto_method():
+    if _program_exists('iptables'):
+        method_name = "nat"
+    elif _program_exists('pfctl'):
+        method_name = "pf"
+    else:
+        raise Fatal(
+            "can't find either iptables or pfctl; check your PATH")
+
+    return get_method(method_name)

sshuttle/methods/nat.py

@@ -0,0 +1,89 @@
+import socket
+from sshuttle.helpers import family_to_string
+from sshuttle.linux import ipt, ipt_ttl, ipt_chain_exists, nonfatal
+from sshuttle.methods import BaseMethod
+
+
+class Method(BaseMethod):
+
+    # We name the chain based on the transproxy port number so that it's
+    # possible to run multiple copies of sshuttle at the same time.  Of course,
+    # the multiple copies shouldn't have overlapping subnets, or only the most-
+    # recently-started one will win (because we use "-I OUTPUT 1" instead of
+    # "-A OUTPUT").
+    def setup_firewall(self, port, dnsport, nslist, family, subnets, udp):
+        # only ipv4 supported with NAT
+        if family != socket.AF_INET:
+            raise Exception(
+                'Address family "%s" unsupported by nat method_name'
+                % family_to_string(family))
+        if udp:
+            raise Exception("UDP not supported by nat method_name")
+
+        table = "nat"
+
+        def _ipt(*args):
+            return ipt(family, table, *args)
+
+        def _ipt_ttl(*args):
+            return ipt_ttl(family, table, *args)
+
+        chain = 'sshuttle-%s' % port
+
+        # basic cleanup/setup of chains
+        self.restore_firewall(port, family, udp)
+
+        _ipt('-N', chain)
+        _ipt('-F', chain)
+        _ipt('-I', 'OUTPUT', '1', '-j', chain)
+        _ipt('-I', 'PREROUTING', '1', '-j', chain)
+
+        # create new subnet entries.  Note that we're sorting in a very
+        # particular order: we need to go from most-specific (largest
+        # swidth) to least-specific, and at any given level of specificity,
+        # we want excludes to come first.  That's why the columns are in
+        # such a non- intuitive order.
+        for f, swidth, sexclude, snet \
+                in sorted(subnets, key=lambda s: s[1], reverse=True):
+            if sexclude:
+                _ipt('-A', chain, '-j', 'RETURN',
+                     '--dest', '%s/%s' % (snet, swidth),
+                     '-p', 'tcp')
+            else:
+                _ipt_ttl('-A', chain, '-j', 'REDIRECT',
+                         '--dest', '%s/%s' % (snet, swidth),
+                         '-p', 'tcp',
+                         '--to-ports', str(port))
+
+        for f, ip in [i for i in nslist if i[0] == family]:
+            _ipt_ttl('-A', chain, '-j', 'REDIRECT',
+                     '--dest', '%s/32' % ip,
+                     '-p', 'udp',
+                     '--dport', '53',
+                     '--to-ports', str(dnsport))
+
+    def restore_firewall(self, port, family, udp):
+        # only ipv4 supported with NAT
+        if family != socket.AF_INET:
+            raise Exception(
+                'Address family "%s" unsupported by nat method_name'
+                % family_to_string(family))
+        if udp:
+            raise Exception("UDP not supported by nat method_name")
+
+        table = "nat"
+
+        def _ipt(*args):
+            return ipt(family, table, *args)
+
+        def _ipt_ttl(*args):
+            return ipt_ttl(family, table, *args)
+
+        chain = 'sshuttle-%s' % port
+
+        # basic cleanup/setup of chains
+        if ipt_chain_exists(family, table, chain):
+            nonfatal(_ipt, '-D', 'OUTPUT', '-j', chain)
+            nonfatal(_ipt, '-D', 'PREROUTING', '-j', chain)
+            nonfatal(_ipt, '-F', chain)
+            _ipt('-X', chain)

sshuttle/methods/pf.py

@@ -0,0 +1,420 @@
+import os
+import sys
+import re
+import socket
+import struct
+import subprocess as ssubprocess
+from fcntl import ioctl
+from ctypes import c_char, c_uint8, c_uint16, c_uint32, Union, Structure, \
+    sizeof, addressof, memmove
+from sshuttle.helpers import debug1, debug2, debug3, Fatal, family_to_string
+from sshuttle.methods import BaseMethod
+
+
+_pf_context = {'started_by_sshuttle': False, 'Xtoken': None}
+_pf_fd = None
+
+
+class Generic(object):
+    MAXPATHLEN = 1024
+    PF_CHANGE_ADD_TAIL = 2
+    PF_CHANGE_GET_TICKET = 6
+    PF_PASS = 0
+    PF_RDR = 8
+    PF_OUT = 2
+    ACTION_OFFSET = 0
+    POOL_TICKET_OFFSET = 8
+    ANCHOR_CALL_OFFSET = 1040
+
+    class pf_addr(Structure):
+        class _pfa(Union):
+             _fields_ = [("v4", c_uint32),     # struct in_addr
+                        ("v6", c_uint32 * 4),  # struct in6_addr
+                        ("addr8", c_uint8 * 16),
+                        ("addr16", c_uint16 * 8),
+                        ("addr32", c_uint32 * 4)]
+
+        _fields_ = [("pfa", _pfa)]
+        _anonymous_ = ("pfa",)
+
+    def __init__(self):
+        self.status = b''
+        self.pfioc_pooladdr = c_char * 1136
+
+        self.DIOCNATLOOK = (
+            (0x40000000 | 0x80000000) |
+            ((sizeof(self.pfioc_natlook) & 0x1fff) << 16) |
+            ((ord('D')) << 8) | (23))
+        self.DIOCCHANGERULE = (
+            (0x40000000 | 0x80000000) |
+            ((sizeof(self.pfioc_rule) & 0x1fff) << 16) |
+            ((ord('D')) << 8) | (26))
+        self.DIOCBEGINADDRS = (
+            (0x40000000 | 0x80000000) |
+            ((sizeof(self.pfioc_pooladdr) & 0x1fff) << 16) |
+            ((ord('D')) << 8) | (51))
+
+    def enable(self):
+        if b'INFO:\nStatus: Disabled' in self.status:
+            pfctl('-e')
+            _pf_context['started_by_sshuttle'] = True
+
+    def disable(self):
+        if _pf_context['started_by_sshuttle']:
+            pfctl('-d')
+
+    def query_nat(self, family, proto, src_ip, src_port, dst_ip, dst_port):
+        [proto, family, src_port, dst_port] = [
+            int(v) for v in [proto, family, src_port, dst_port]]
+
+        packed_src_ip = socket.inet_pton(family, src_ip)
+        packed_dst_ip = socket.inet_pton(family, dst_ip)
+
+        assert len(packed_src_ip) == len(packed_dst_ip)
+        length = len(packed_src_ip)
+
+        pnl = self.pfioc_natlook()
+        pnl.proto = proto
+        pnl.direction = self.PF_OUT
+        pnl.af = family
+        memmove(addressof(pnl.saddr), packed_src_ip, length)
+        memmove(addressof(pnl.daddr), packed_dst_ip, length)
+        self._add_natlook_ports(pnl, src_port, dst_port)
+
+        ioctl(pf_get_dev(), self.DIOCNATLOOK,
+              (c_char * sizeof(pnl)).from_address(addressof(pnl)))
+
+        ip = socket.inet_ntop(
+            pnl.af, (c_char * length).from_address(addressof(pnl.rdaddr)).raw)
+        port = socket.ntohs(self._get_natlook_port(pnl.rdxport))
+        return (ip, port)
+
+    def _add_natlook_ports(self, pnl, src_port, dst_port):
+        pnl.sxport = socket.htons(src_port)
+        pnl.dxport = socket.htons(dst_port)
+
+    def _get_natlook_port(self, xport):
+        return xport
+
+    def add_anchors(self, status=None):
+        if status is None:
+            status = pfctl('-s all')[0]
+        self.status = status
+        if b'\nanchor "sshuttle"' not in status:
+            self._add_anchor_rule(self.PF_PASS, b"sshuttle")
+
+    def _add_anchor_rule(self, type, name, pr=None):
+        if pr is None:
+            pr = self.pfioc_rule()
+
+        memmove(addressof(pr) + self.ANCHOR_CALL_OFFSET, name,
+                min(self.MAXPATHLEN, len(name)))  # anchor_call = name
+        memmove(addressof(pr) + self.RULE_ACTION_OFFSET,
+                struct.pack('I', type), 4)  # rule.action = type
+
+        memmove(addressof(pr) + self.ACTION_OFFSET, struct.pack(
+            'I', self.PF_CHANGE_GET_TICKET), 4)  # action = PF_CHANGE_GET_TICKET
+        ioctl(pf_get_dev(), pf.DIOCCHANGERULE, pr)
+
+        memmove(addressof(pr) + self.ACTION_OFFSET, struct.pack(
+            'I', self.PF_CHANGE_ADD_TAIL), 4)  # action = PF_CHANGE_ADD_TAIL
+        ioctl(pf_get_dev(), pf.DIOCCHANGERULE, pr)
+
+    def add_rules(self, rules):
+        assert isinstance(rules, bytes)
+        debug3("rules:\n" + rules.decode("ASCII"))
+        pfctl('-a sshuttle -f /dev/stdin', rules)
+
+
+class FreeBsd(Generic):
+    RULE_ACTION_OFFSET = 2968
+
+    def __new__(cls):
+        class pfioc_natlook(Structure):
+            pf_addr = Generic.pf_addr
+            _fields_ = [("saddr", pf_addr),
+                        ("daddr", pf_addr),
+                        ("rsaddr", pf_addr),
+                        ("rdaddr", pf_addr),
+                        ("sxport", c_uint16),
+                        ("dxport", c_uint16),
+                        ("rsxport", c_uint16),
+                        ("rdxport", c_uint16),
+                        ("af", c_uint8),                      # sa_family_t
+                        ("proto", c_uint8),
+                        ("proto_variant", c_uint8),
+                        ("direction", c_uint8)]
+
+        freebsd = Generic.__new__(cls)
+        freebsd.pfioc_rule = c_char * 3040
+        freebsd.pfioc_natlook = pfioc_natlook
+        return freebsd
+
+    def __init__(self):
+        super(FreeBsd, self).__init__()
+
+    def add_anchors(self):
+        status = pfctl('-s all')[0]
+        if b'\nrdr-anchor "sshuttle"' not in status:
+            self._add_anchor_rule(self.PF_RDR, b'sshuttle')
+        super(FreeBsd, self).add_anchors(status=status)
+
+    def _add_anchor_rule(self, type, name):
+        pr = self.pfioc_rule()
+        ppa = self.pfioc_pooladdr()
+
+        ioctl(pf_get_dev(), self.DIOCBEGINADDRS, ppa)
+        # pool ticket
+        memmove(addressof(pr) + self.POOL_TICKET_OFFSET, ppa[4:8], 4)
+        super(FreeBsd, self)._add_anchor_rule(type, name, pr=pr)
+
+    def add_rules(self, includes, port, dnsport, nslist):
+        tables = [
+            b'table <forward_subnets> {%s}' % b','.join(includes)
+        ]
+        translating_rules = [
+            b'rdr pass on lo0 proto tcp '
+            b'to <forward_subnets> -> 127.0.0.1 port %r' % port
+        ]
+        filtering_rules = [
+            b'pass out route-to lo0 inet proto tcp '
+            b'to <forward_subnets> keep state'
+        ]
+
+        if len(nslist) > 0:
+            tables.append(
+                b'table <dns_servers> {%s}' %
+                b','.join([ns[1].encode("ASCII") for ns in nslist]))
+            translating_rules.append(
+                b'rdr pass on lo0 proto udp to '
+                b'<dns_servers> port 53 -> 127.0.0.1 port %r' % dnsport)
+            filtering_rules.append(
+                b'pass out route-to lo0 inet proto udp to '
+                b'<dns_servers> port 53 keep state')
+
+        rules = b'\n'.join(tables + translating_rules + filtering_rules) \
+                + b'\n'
+
+        super(FreeBsd, self).add_rules(rules)
+
+
+class OpenBsd(Generic):
+    POOL_TICKET_OFFSET = 4
+    RULE_ACTION_OFFSET = 3324
+    ANCHOR_CALL_OFFSET = 1036
+
+    def __init__(self):
+        class pfioc_natlook(Structure):
+            pf_addr = Generic.pf_addr
+            _fields_ = [("saddr", pf_addr),
+                        ("daddr", pf_addr),
+                        ("rsaddr", pf_addr),
+                        ("rdaddr", pf_addr),
+                        ("rdomain", c_uint16),
+                        ("rrdomain", c_uint16),
+                        ("sxport", c_uint16),
+                        ("dxport", c_uint16),
+                        ("rsxport", c_uint16),
+                        ("rdxport", c_uint16),
+                        ("af", c_uint8),                      # sa_family_t
+                        ("proto", c_uint8),
+                        ("proto_variant", c_uint8),
+                        ("direction", c_uint8)]
+
+        self.pfioc_rule = c_char * 3400
+        self.pfioc_natlook = pfioc_natlook
+        super(OpenBsd, self).__init__()
+
+    def add_anchors(self):
+        # before adding anchors and rules we must override the skip lo
+        # that comes by default in openbsd pf.conf so the rules we will add,
+        # which rely on translating/filtering  packets on lo, can work
+        pfctl('-f /dev/stdin', b'match on lo\n')
+        super(OpenBsd, self).add_anchors()
+
+    def add_rules(self, includes, port, dnsport, nslist):
+        tables = [
+            b'table <forward_subnets> {%s}' % b','.join(includes)
+        ]
+        translating_rules = [
+            b'pass in on lo0 inet proto tcp '
+            b'divert-to 127.0.0.1 port %r' % port
+        ]
+        filtering_rules = [
+            b'pass out inet proto tcp '
+            b'to <forward_subnets> route-to lo0 keep state'
+        ]
+
+        if len(nslist) > 0:
+            tables.append(
+                b'table <dns_servers> {%s}' %
+                b','.join([ns[1].encode("ASCII") for ns in nslist]))
+            translating_rules.append(
+                b'pass in on lo0 inet proto udp to <dns_servers>'
+                b'port 53 rdr-to 127.0.0.1 port %r' % dnsport)
+            filtering_rules.append(
+                b'pass out inet proto udp to '
+                b'<dns_servers> port 53 route-to lo0 keep state')
+
+        rules = b'\n'.join(tables + translating_rules + filtering_rules) \
+                + b'\n'
+
+        super(OpenBsd, self).add_rules(rules)
+
+
+class Darwin(FreeBsd):
+    RULE_ACTION_OFFSET = 3068
+
+    def __init__(self):
+        class pf_state_xport(Union):
+            _fields_ = [("port", c_uint16),
+                        ("call_id", c_uint16),
+                        ("spi", c_uint32)]
+
+        class pfioc_natlook(Structure):
+            pf_addr = Generic.pf_addr
+            _fields_ = [("saddr", pf_addr),
+                        ("daddr", pf_addr),
+                        ("rsaddr", pf_addr),
+                        ("rdaddr", pf_addr),
+                        ("sxport", pf_state_xport),
+                        ("dxport", pf_state_xport),
+                        ("rsxport", pf_state_xport),
+                        ("rdxport", pf_state_xport),
+                        ("af", c_uint8),                      # sa_family_t
+                        ("proto", c_uint8),
+                        ("proto_variant", c_uint8),
+                        ("direction", c_uint8)]
+
+        self.pfioc_rule = c_char * 3104
+        self.pfioc_natlook = pfioc_natlook
+        super(Darwin, self).__init__()
+
+    def enable(self):
+        o = pfctl('-E')
+        _pf_context['Xtoken'] = \
+            re.search(b'Token : (.+)', o[1]).group(1)
+
+    def disable(self):
+        if _pf_context['Xtoken'] is not None:
+            pfctl('-X %s' % _pf_context['Xtoken'].decode("ASCII"))
+
+    def add_anchors(self):
+        # before adding anchors and rules we must override the skip lo
+        # that in some cases ends up in the chain so the rules we will add,
+        # which rely on translating/filtering  packets on lo, can work
+        pfctl('-f /dev/stdin', b'pass on lo\n')
+        super(Darwin, self).add_anchors()
+
+    def _add_natlook_ports(self, pnl, src_port, dst_port):
+        pnl.sxport.port = socket.htons(src_port)
+        pnl.dxport.port = socket.htons(dst_port)
+
+    def _get_natlook_port(self, xport):
+        return xport.port
+
+
+if sys.platform == 'darwin':
+    pf = Darwin()
+elif sys.platform.startswith('openbsd'):
+    pf = OpenBsd()
+else:
+    pf = FreeBsd()
+
+
+def pfctl(args, stdin=None):
+    argv = ['pfctl'] + list(args.split(" "))
+    debug1('>> %s\n' % ' '.join(argv))
+
+    p = ssubprocess.Popen(argv, stdin=ssubprocess.PIPE,
+                          stdout=ssubprocess.PIPE,
+                          stderr=ssubprocess.PIPE)
+    o = p.communicate(stdin)
+    if p.returncode:
+        raise Fatal('%r returned %d' % (argv, p.returncode))
+
+    return o
+
+
+def pf_get_dev():
+    global _pf_fd
+    if _pf_fd is None:
+        _pf_fd = os.open('/dev/pf', os.O_RDWR)
+
+    return _pf_fd
+
+
+
+class Method(BaseMethod):
+
+    def get_tcp_dstip(self, sock):
+        pfile = self.firewall.pfile
+
+        peer = sock.getpeername()
+        proxy = sock.getsockname()
+
+        argv = (sock.family, socket.IPPROTO_TCP,
+                peer[0].encode("ASCII"), peer[1],
+                proxy[0].encode("ASCII"), proxy[1])
+        out_line = b"QUERY_PF_NAT %d,%d,%s,%d,%s,%d\n" % argv
+        pfile.write(out_line)
+        pfile.flush()
+        in_line = pfile.readline()
+        debug2(out_line.decode("ASCII") + ' > ' + in_line.decode("ASCII"))
+        if in_line.startswith(b'QUERY_PF_NAT_SUCCESS '):
+            (ip, port) = in_line[21:].split(b',')
+            return (ip.decode("ASCII"), int(port))
+
+        return sock.getsockname()
+
+    def setup_firewall(self, port, dnsport, nslist, family, subnets, udp):
+        tables = []
+        translating_rules = []
+        filtering_rules = []
+
+        if family != socket.AF_INET:
+            raise Exception(
+                'Address family "%s" unsupported by pf method_name'
+                % family_to_string(family))
+        if udp:
+            raise Exception("UDP not supported by pf method_name")
+
+        if len(subnets) > 0:
+            includes = []
+            # If a given subnet is both included and excluded, list the
+            # exclusion first; the table will ignore the second, opposite
+            # definition
+            for f, swidth, sexclude, snet in sorted(
+                    subnets, key=lambda s: (s[1], s[2]), reverse=True):
+                includes.append(b"%s%s/%d" %
+                                (b"!" if sexclude else b"",
+                                    snet.encode("ASCII"),
+                                    swidth))
+
+        pf.add_anchors()
+        pf.add_rules(includes, port, dnsport, nslist)
+        pf.enable()
+
+    def restore_firewall(self, port, family, udp):
+        if family != socket.AF_INET:
+            raise Exception(
+                'Address family "%s" unsupported by pf method_name'
+                % family_to_string(family))
+        if udp:
+            raise Exception("UDP not supported by pf method_name")
+
+        pfctl('-a sshuttle -F all')
+        pf.disable()
+
+    def firewall_command(self, line):
+        if line.startswith('QUERY_PF_NAT '):
+            try:
+                dst = pf.query_nat(*(line[13:].split(',')))
+                sys.stdout.write('QUERY_PF_NAT_SUCCESS %s,%r\n' % dst)
+            except IOError as e:
+                sys.stdout.write('QUERY_PF_NAT_FAILURE %s\n' % e)
+
+            sys.stdout.flush()
+            return True
+        else:
+            return False

sshuttle/methods/tproxy.py

@@ -0,0 +1,268 @@
+import struct
+from sshuttle.helpers import family_to_string
+from sshuttle.linux import ipt, ipt_ttl, ipt_chain_exists
+from sshuttle.methods import BaseMethod
+from sshuttle.helpers import debug1, debug3, Fatal
+
+recvmsg = None
+try:
+    # try getting recvmsg from python
+    import socket as pythonsocket
+    getattr(pythonsocket.socket, "recvmsg")
+    socket = pythonsocket
+    recvmsg = "python"
+except AttributeError:
+    # try getting recvmsg from socket_ext library
+    try:
+        import socket_ext
+        getattr(socket_ext.socket, "recvmsg")
+        socket = socket_ext
+        recvmsg = "socket_ext"
+    except ImportError:
+        import socket
+
+
+IP_TRANSPARENT = 19
+IP_ORIGDSTADDR = 20
+IP_RECVORIGDSTADDR = IP_ORIGDSTADDR
+SOL_IPV6 = 41
+IPV6_ORIGDSTADDR = 74
+IPV6_RECVORIGDSTADDR = IPV6_ORIGDSTADDR
+
+if recvmsg == "python":
+    def recv_udp(listener, bufsize):
+        debug3('Accept UDP python using recvmsg.\n')
+        data, ancdata, msg_flags, srcip = listener.recvmsg(
+            4096, socket.CMSG_SPACE(24))
+        dstip = None
+        family = None
+        for cmsg_level, cmsg_type, cmsg_data in ancdata:
+            if cmsg_level == socket.SOL_IP and cmsg_type == IP_ORIGDSTADDR:
+                family, port = struct.unpack('=HH', cmsg_data[0:4])
+                port = socket.htons(port)
+                if family == socket.AF_INET:
+                    start = 4
+                    length = 4
+                else:
+                    raise Fatal("Unsupported socket type '%s'" % family)
+                ip = socket.inet_ntop(family, cmsg_data[start:start + length])
+                dstip = (ip, port)
+                break
+            elif cmsg_level == SOL_IPV6 and cmsg_type == IPV6_ORIGDSTADDR:
+                family, port = struct.unpack('=HH', cmsg_data[0:4])
+                port = socket.htons(port)
+                if family == socket.AF_INET6:
+                    start = 8
+                    length = 16
+                else:
+                    raise Fatal("Unsupported socket type '%s'" % family)
+                ip = socket.inet_ntop(family, cmsg_data[start:start + length])
+                dstip = (ip, port)
+                break
+        return (srcip, dstip, data)
+elif recvmsg == "socket_ext":
+    def recv_udp(listener, bufsize):
+        debug3('Accept UDP using socket_ext recvmsg.\n')
+        srcip, data, adata, flags = listener.recvmsg(
+            (bufsize,), socket.CMSG_SPACE(24))
+        dstip = None
+        family = None
+        for a in adata:
+            if a.cmsg_level == socket.SOL_IP and a.cmsg_type == IP_ORIGDSTADDR:
+                family, port = struct.unpack('=HH', a.cmsg_data[0:4])
+                port = socket.htons(port)
+                if family == socket.AF_INET:
+                    start = 4
+                    length = 4
+                else:
+                    raise Fatal("Unsupported socket type '%s'" % family)
+                ip = socket.inet_ntop(
+                    family, a.cmsg_data[start:start + length])
+                dstip = (ip, port)
+                break
+            elif a.cmsg_level == SOL_IPV6 and a.cmsg_type == IPV6_ORIGDSTADDR:
+                family, port = struct.unpack('=HH', a.cmsg_data[0:4])
+                port = socket.htons(port)
+                if family == socket.AF_INET6:
+                    start = 8
+                    length = 16
+                else:
+                    raise Fatal("Unsupported socket type '%s'" % family)
+                ip = socket.inet_ntop(
+                    family, a.cmsg_data[start:start + length])
+                dstip = (ip, port)
+                break
+        return (srcip, dstip, data[0])
+else:
+    def recv_udp(listener, bufsize):
+        debug3('Accept UDP using recvfrom.\n')
+        data, srcip = listener.recvfrom(bufsize)
+        return (srcip, None, data)
+
+
+class Method(BaseMethod):
+
+    def get_supported_features(self):
+        result = super(Method, self).get_supported_features()
+        result.ipv6 = True
+        if recvmsg is None:
+            result.udp = False
+            result.dns = False
+        else:
+            result.udp = True
+            result.dns = True
+        return result
+
+    def get_tcp_dstip(self, sock):
+        return sock.getsockname()
+
+    def recv_udp(self, udp_listener, bufsize):
+        srcip, dstip, data = recv_udp(udp_listener, bufsize)
+        if not dstip:
+            debug1(
+                "-- ignored UDP from %r: "
+                "couldn't determine destination IP address\n" % (srcip,))
+            return None
+        return srcip, dstip, data
+
+    def send_udp(self, sock, srcip, dstip, data):
+        if not srcip:
+            debug1(
+                "-- ignored UDP to %r: "
+                "couldn't determine source IP address\n" % (dstip,))
+            return
+        sender = socket.socket(sock.family, socket.SOCK_DGRAM)
+        sender.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        sender.setsockopt(socket.SOL_IP, IP_TRANSPARENT, 1)
+        sender.bind(srcip)
+        sender.sendto(data, dstip)
+        sender.close()
+
+    def setup_tcp_listener(self, tcp_listener):
+        tcp_listener.setsockopt(socket.SOL_IP, IP_TRANSPARENT, 1)
+
+    def setup_udp_listener(self, udp_listener):
+        udp_listener.setsockopt(socket.SOL_IP, IP_TRANSPARENT, 1)
+        if udp_listener.v4 is not None:
+            udp_listener.v4.setsockopt(
+                socket.SOL_IP, IP_RECVORIGDSTADDR, 1)
+        if udp_listener.v6 is not None:
+            udp_listener.v6.setsockopt(SOL_IPV6, IPV6_RECVORIGDSTADDR, 1)
+
+    def setup_firewall(self, port, dnsport, nslist, family, subnets, udp):
+        if family not in [socket.AF_INET, socket.AF_INET6]:
+            raise Exception(
+                'Address family "%s" unsupported by tproxy method'
+                % family_to_string(family))
+
+        table = "mangle"
+
+        def _ipt(*args):
+            return ipt(family, table, *args)
+
+        def _ipt_ttl(*args):
+            return ipt_ttl(family, table, *args)
+
+        mark_chain = 'sshuttle-m-%s' % port
+        tproxy_chain = 'sshuttle-t-%s' % port
+        divert_chain = 'sshuttle-d-%s' % port
+
+        # basic cleanup/setup of chains
+        self.restore_firewall(port, family, udp)
+
+        _ipt('-N', mark_chain)
+        _ipt('-F', mark_chain)
+        _ipt('-N', divert_chain)
+        _ipt('-F', divert_chain)
+        _ipt('-N', tproxy_chain)
+        _ipt('-F', tproxy_chain)
+        _ipt('-I', 'OUTPUT', '1', '-j', mark_chain)
+        _ipt('-I', 'PREROUTING', '1', '-j', tproxy_chain)
+        _ipt('-A', divert_chain, '-j', 'MARK', '--set-mark', '1')
+        _ipt('-A', divert_chain, '-j', 'ACCEPT')
+        _ipt('-A', tproxy_chain, '-m', 'socket', '-j', divert_chain,
+             '-m', 'tcp', '-p', 'tcp')
+
+        if udp:
+            _ipt('-A', tproxy_chain, '-m', 'socket', '-j', divert_chain,
+                 '-m', 'udp', '-p', 'udp')
+
+        for f, ip in [i for i in nslist if i[0] == family]:
+            _ipt('-A', mark_chain, '-j', 'MARK', '--set-mark', '1',
+                 '--dest', '%s/32' % ip,
+                 '-m', 'udp', '-p', 'udp', '--dport', '53')
+            _ipt('-A', tproxy_chain, '-j', 'TPROXY',
+                 '--tproxy-mark', '0x1/0x1',
+                 '--dest', '%s/32' % ip,
+                 '-m', 'udp', '-p', 'udp', '--dport', '53',
+                 '--on-port', str(dnsport))
+
+        for f, swidth, sexclude, snet \
+                in sorted(subnets, key=lambda s: s[1], reverse=True):
+            if sexclude:
+                _ipt('-A', mark_chain, '-j', 'RETURN',
+                     '--dest', '%s/%s' % (snet, swidth),
+                     '-m', 'tcp', '-p', 'tcp')
+                _ipt('-A', tproxy_chain, '-j', 'RETURN',
+                     '--dest', '%s/%s' % (snet, swidth),
+                     '-m', 'tcp', '-p', 'tcp')
+            else:
+                _ipt('-A', mark_chain, '-j', 'MARK', '--set-mark', '1',
+                     '--dest', '%s/%s' % (snet, swidth),
+                     '-m', 'tcp', '-p', 'tcp')
+                _ipt('-A', tproxy_chain, '-j', 'TPROXY',
+                     '--tproxy-mark', '0x1/0x1',
+                     '--dest', '%s/%s' % (snet, swidth),
+                     '-m', 'tcp', '-p', 'tcp',
+                     '--on-port', str(port))
+
+            if udp:
+                if sexclude:
+                    _ipt('-A', mark_chain, '-j', 'RETURN',
+                         '--dest', '%s/%s' % (snet, swidth),
+                         '-m', 'udp', '-p', 'udp')
+                    _ipt('-A', tproxy_chain, '-j', 'RETURN',
+                         '--dest', '%s/%s' % (snet, swidth),
+                         '-m', 'udp', '-p', 'udp')
+                else:
+                    _ipt('-A', mark_chain, '-j', 'MARK', '--set-mark', '1',
+                         '--dest', '%s/%s' % (snet, swidth),
+                         '-m', 'udp', '-p', 'udp')
+                    _ipt('-A', tproxy_chain, '-j', 'TPROXY',
+                         '--tproxy-mark', '0x1/0x1',
+                         '--dest', '%s/%s' % (snet, swidth),
+                         '-m', 'udp', '-p', 'udp',
+                         '--on-port', str(port))
+
+    def restore_firewall(self, port, family, udp):
+        if family not in [socket.AF_INET, socket.AF_INET6]:
+            raise Exception(
+                'Address family "%s" unsupported by tproxy method'
+                % family_to_string(family))
+
+        table = "mangle"
+
+        def _ipt(*args):
+            return ipt(family, table, *args)
+
+        def _ipt_ttl(*args):
+            return ipt_ttl(family, table, *args)
+
+        mark_chain = 'sshuttle-m-%s' % port
+        tproxy_chain = 'sshuttle-t-%s' % port
+        divert_chain = 'sshuttle-d-%s' % port
+
+        # basic cleanup/setup of chains
+        if ipt_chain_exists(family, table, mark_chain):
+            _ipt('-D', 'OUTPUT', '-j', mark_chain)
+            _ipt('-F', mark_chain)
+            _ipt('-X', mark_chain)
+
+        if ipt_chain_exists(family, table, tproxy_chain):
+            _ipt('-D', 'PREROUTING', '-j', tproxy_chain)
+            _ipt('-F', tproxy_chain)
+            _ipt('-X', tproxy_chain)
+
+        if ipt_chain_exists(family, table, divert_chain):
+            _ipt('-F', divert_chain)
+            _ipt('-X', divert_chain)

sshuttle/options.py

@@ -1,9 +1,16 @@
 """Command-line options parser.
 With the help of an options spec string, easily parse command-line options.
 """
-import sys, os, textwrap, getopt, re, struct
+import sys
+import os
+import textwrap
+import getopt
+import re
+import struct
+
 
 class OptDict:
+
     def __init__(self):
         self._opts = {}
 
@@ -46,24 +53,29 @@ def _atoi(v):
 def _remove_negative_kv(k, v):
     if k.startswith('no-') or k.startswith('no_'):
         return k[3:], not v
-    return k,v
+    return k, v
+
 
 def _remove_negative_k(k):
     return _remove_negative_kv(k, None)[0]
 
 
 def _tty_width():
+    if not hasattr(sys.stderr, "fileno"):
+        return _atoi(os.environ.get('WIDTH')) or 70
     s = struct.pack("HHHH", 0, 0, 0, 0)
     try:
-        import fcntl, termios
+        import fcntl
+        import termios
         s = fcntl.ioctl(sys.stderr.fileno(), termios.TIOCGWINSZ, s)
     except (IOError, ImportError):
         return _atoi(os.environ.get('WIDTH')) or 70
-    (ysize,xsize,ypix,xpix) = struct.unpack('HHHH', s)
+    (ysize, xsize, ypix, xpix) = struct.unpack('HHHH', s)
     return xsize or 70
 
 
 class Options:
+
     """Option parser.
     When constructed, two strings are mandatory. The first one is the command
     name showed before error messages. The second one is a string called an
@@ -76,6 +88,7 @@ class Options:
     By default, the parser function is getopt.gnu_getopt, and the abort
     behaviour is to exit the program.
     """
+
     def __init__(self, optspec, optfunc=getopt.gnu_getopt,
                  onabort=_default_onabort):
         self.optspec = optspec
@@ -95,7 +108,8 @@ class Options:
         first_syn = True
         while lines:
             l = lines.pop()
-            if l == '--': break
+            if l == '--':
+                break
             out.append('%s: %s\n' % (first_syn and 'usage' or '   or', l))
             first_syn = False
         out.append('\n')
@@ -122,7 +136,7 @@ class Options:
                 flagl = flags.split(',')
                 flagl_nice = []
                 for _f in flagl:
-                    f,dvi = _remove_negative_kv(_f, _intify(defval))
+                    f, dvi = _remove_negative_kv(_f, _intify(defval))
                     self._aliases[f] = _remove_negative_k(flagl[0])
                     self._hasparms[f] = has_parm
                     self._defaults[f] = dvi
@@ -140,8 +154,8 @@ class Options:
                     flags_nice += ' ...'
                 prefix = '    %-20s  ' % flags_nice
                 argtext = '\n'.join(textwrap.wrap(extra, width=_tty_width(),
-                                                initial_indent=prefix,
-                                                subsequent_indent=' '*28))
+                                                  initial_indent=prefix,
+                                                  subsequent_indent=' ' * 28))
                 out.append(argtext + '\n')
                 last_was_option = True
             else:
@@ -170,17 +184,18 @@ class Options:
         and "extra" is a list of positional arguments.
         """
         try:
-            (flags,extra) = self.optfunc(args, self._shortopts, self._longopts)
-        except getopt.GetoptError, e:
+            (flags, extra) = self.optfunc(
+                args, self._shortopts, self._longopts)
+        except getopt.GetoptError as e:
             self.fatal(e)
 
         opt = OptDict()
 
-        for k,v in self._defaults.iteritems():
+        for k, v in self._defaults.items():
             k = self._aliases[k]
             opt[k] = v
 
-        for (k,v) in flags:
+        for (k, v) in flags:
             k = k.lstrip('-')
             if k in ('h', '?', 'help'):
                 self.usage()
@@ -195,6 +210,6 @@ class Options:
                 else:
                     v = _intify(v)
             opt[k] = v
-        for (f1,f2) in self._aliases.iteritems():
+        for (f1, f2) in self._aliases.items():
             opt[f1] = opt._opts.get(f2)
-        return (opt,flags,extra)
+        return (opt, flags, extra)

sshuttle/server.py

@@ -0,0 +1,349 @@
+import re
+import struct
+import socket
+import traceback
+import time
+import sys
+import os
+import platform
+
+import sshuttle.ssnet as ssnet
+import sshuttle.helpers as helpers
+import sshuttle.hostwatch as hostwatch
+import subprocess as ssubprocess
+from sshuttle.ssnet import Handler, Proxy, Mux, MuxWrapper
+from sshuttle.helpers import log, debug1, debug2, debug3, Fatal, \
+    resolvconf_random_nameserver
+
+
+def _ipmatch(ipstr):
+    if ipstr == b'default':
+        ipstr = b'0.0.0.0/0'
+    m = re.match(b'^(\d+(\.\d+(\.\d+(\.\d+)?)?)?)(?:/(\d+))?$', ipstr)
+    if m:
+        g = m.groups()
+        ips = g[0]
+        width = int(g[4] or 32)
+        if g[1] is None:
+            ips += b'.0.0.0'
+            width = min(width, 8)
+        elif g[2] is None:
+            ips += b'.0.0'
+            width = min(width, 16)
+        elif g[3] is None:
+            ips += b'.0'
+            width = min(width, 24)
+        ips = ips.decode("ASCII")
+        return (struct.unpack('!I', socket.inet_aton(ips))[0], width)
+
+
+def _ipstr(ip, width):
+    if width >= 32:
+        return ip
+    else:
+        return "%s/%d" % (ip, width)
+
+
+def _maskbits(netmask):
+    if not netmask:
+        return 32
+    for i in range(32):
+        if netmask[0] & _shl(1, i):
+            return 32 - i
+    return 0
+
+
+def _shl(n, bits):
+    return n * int(2 ** bits)
+
+
+def _list_routes():
+    # FIXME: IPv4 only
+    argv = ['netstat', '-rn']
+    p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE)
+    routes = []
+    for line in p.stdout:
+        cols = re.split(b'\s+', line)
+        ipw = _ipmatch(cols[0])
+        if not ipw:
+            continue  # some lines won't be parseable; never mind
+        maskw = _ipmatch(cols[2])  # linux only
+        mask = _maskbits(maskw)   # returns 32 if maskw is null
+        width = min(ipw[1], mask)
+        ip = ipw[0] & _shl(_shl(1, width) - 1, 32 - width)
+        routes.append(
+            (socket.AF_INET, socket.inet_ntoa(struct.pack('!I', ip)), width))
+    rv = p.wait()
+    if rv != 0:
+        log('WARNING: %r returned %d\n' % (argv, rv))
+        log('WARNING: That prevents --auto-nets from working.\n')
+    return routes
+
+
+def list_routes():
+    for (family, ip, width) in _list_routes():
+        if not ip.startswith('0.') and not ip.startswith('127.'):
+            yield (family, ip, width)
+
+
+def _exc_dump():
+    exc_info = sys.exc_info()
+    return ''.join(traceback.format_exception(*exc_info))
+
+
+def start_hostwatch(seed_hosts):
+    s1, s2 = socket.socketpair()
+    pid = os.fork()
+    if not pid:
+        # child
+        rv = 99
+        try:
+            try:
+                s2.close()
+                os.dup2(s1.fileno(), 1)
+                os.dup2(s1.fileno(), 0)
+                s1.close()
+                rv = hostwatch.hw_main(seed_hosts) or 0
+            except Exception:
+                log('%s\n' % _exc_dump())
+                rv = 98
+        finally:
+            os._exit(rv)
+    s1.close()
+    return pid, s2
+
+
+class Hostwatch:
+
+    def __init__(self):
+        self.pid = 0
+        self.sock = None
+
+
+class DnsProxy(Handler):
+
+    def __init__(self, mux, chan, request):
+        Handler.__init__(self, [])
+        self.timeout = time.time() + 30
+        self.mux = mux
+        self.chan = chan
+        self.tries = 0
+        self.request = request
+        self.peers = {}
+        self.try_send()
+
+    def try_send(self):
+        if self.tries >= 3:
+            return
+        self.tries += 1
+
+        family, peer = resolvconf_random_nameserver()
+
+        sock = socket.socket(family, socket.SOCK_DGRAM)
+        sock.setsockopt(socket.SOL_IP, socket.IP_TTL, 42)
+        sock.connect((peer, 53))
+
+        self.peers[sock] = peer
+
+        debug2('DNS: sending to %r (try %d)\n' % (peer, self.tries))
+        try:
+            sock.send(self.request)
+            self.socks.append(sock)
+        except socket.error as e:
+            if e.args[0] in ssnet.NET_ERRS:
+                # might have been spurious; try again.
+                # Note: these errors sometimes are reported by recv(),
+                # and sometimes by send().  We have to catch both.
+                debug2('DNS send to %r: %s\n' % (peer, e))
+                self.try_send()
+                return
+            else:
+                log('DNS send to %r: %s\n' % (peer, e))
+                return
+
+    def callback(self, sock):
+        peer = self.peers[sock]
+
+        try:
+            data = sock.recv(4096)
+        except socket.error as e:
+            self.socks.remove(sock)
+            del self.peers[sock]
+
+            if e.args[0] in ssnet.NET_ERRS:
+                # might have been spurious; try again.
+                # Note: these errors sometimes are reported by recv(),
+                # and sometimes by send().  We have to catch both.
+                debug2('DNS recv from %r: %s\n' % (peer, e))
+                self.try_send()
+                return
+            else:
+                log('DNS recv from %r: %s\n' % (peer, e))
+                return
+        debug2('DNS response: %d bytes\n' % len(data))
+        self.mux.send(self.chan, ssnet.CMD_DNS_RESPONSE, data)
+        self.ok = False
+
+
+class UdpProxy(Handler):
+
+    def __init__(self, mux, chan, family):
+        sock = socket.socket(family, socket.SOCK_DGRAM)
+        Handler.__init__(self, [sock])
+        self.timeout = time.time() + 30
+        self.mux = mux
+        self.chan = chan
+        self.sock = sock
+        if family == socket.AF_INET:
+            self.sock.setsockopt(socket.SOL_IP, socket.IP_TTL, 42)
+
+    def send(self, dstip, data):
+        debug2('UDP: sending to %r port %d\n' % dstip)
+        try:
+            self.sock.sendto(data, dstip)
+        except socket.error as e:
+            log('UDP send to %r port %d: %s\n' % (dstip[0], dstip[1], e))
+            return
+
+    def callback(self, sock):
+        try:
+            data, peer = sock.recvfrom(4096)
+        except socket.error as e:
+            log('UDP recv from %r port %d: %s\n' % (peer[0], peer[1], e))
+            return
+        debug2('UDP response: %d bytes\n' % len(data))
+        hdr = "%s,%r," % (peer[0], peer[1])
+        self.mux.send(self.chan, ssnet.CMD_UDP_DATA, hdr + data)
+
+
+def main(latency_control):
+    debug1('Starting server with Python version %s\n'
+           % platform.python_version())
+
+    if helpers.verbose >= 1:
+        helpers.logprefix = ' s: '
+    else:
+        helpers.logprefix = 'server: '
+    debug1('latency control setting = %r\n' % latency_control)
+
+    routes = list(list_routes())
+    debug1('available routes:\n')
+    for r in routes:
+        debug1('  %d/%s/%d\n' % r)
+
+    # synchronization header
+    sys.stdout.write('\0\0SSHUTTLE0001')
+    sys.stdout.flush()
+
+    handlers = []
+    mux = Mux(socket.fromfd(sys.stdin.fileno(),
+                            socket.AF_INET, socket.SOCK_STREAM),
+              socket.fromfd(sys.stdout.fileno(),
+                            socket.AF_INET, socket.SOCK_STREAM))
+    handlers.append(mux)
+    routepkt = b''
+    for r in routes:
+        routepkt += b'%d,%s,%d\n' % (r[0], r[1].encode("ASCII"), r[2])
+    mux.send(0, ssnet.CMD_ROUTES, routepkt)
+
+    hw = Hostwatch()
+    hw.leftover = b''
+
+    def hostwatch_ready(sock):
+        assert(hw.pid)
+        content = hw.sock.recv(4096)
+        if content:
+            lines = (hw.leftover + content).split(b'\n')
+            if lines[-1]:
+                # no terminating newline: entry isn't complete yet!
+                hw.leftover = lines.pop()
+                lines.append(b'')
+            else:
+                hw.leftover = b''
+            mux.send(0, ssnet.CMD_HOST_LIST, b'\n'.join(lines))
+        else:
+            raise Fatal('hostwatch process died')
+
+    def got_host_req(data):
+        if not hw.pid:
+            (hw.pid, hw.sock) = start_hostwatch(data.strip().split())
+            handlers.append(Handler(socks=[hw.sock],
+                                    callback=hostwatch_ready))
+    mux.got_host_req = got_host_req
+
+    def new_channel(channel, data):
+        (family, dstip, dstport) = data.split(b',', 2)
+        family = int(family)
+        dstport = int(dstport)
+        outwrap = ssnet.connect_dst(family, dstip, dstport)
+        handlers.append(Proxy(MuxWrapper(mux, channel), outwrap))
+    mux.new_channel = new_channel
+
+    dnshandlers = {}
+
+    def dns_req(channel, data):
+        debug2('Incoming DNS request channel=%d.\n' % channel)
+        h = DnsProxy(mux, channel, data)
+        handlers.append(h)
+        dnshandlers[channel] = h
+    mux.got_dns_req = dns_req
+
+    udphandlers = {}
+
+    def udp_req(channel, cmd, data):
+        debug2('Incoming UDP request channel=%d, cmd=%d\n' % (channel, cmd))
+        if cmd == ssnet.CMD_UDP_DATA:
+            (dstip, dstport, data) = data.split(",", 2)
+            dstport = int(dstport)
+            debug2('is incoming UDP data. %r %d.\n' % (dstip, dstport))
+            h = udphandlers[channel]
+            h.send((dstip, dstport), data)
+        elif cmd == ssnet.CMD_UDP_CLOSE:
+            debug2('is incoming UDP close\n')
+            h = udphandlers[channel]
+            h.ok = False
+            del mux.channels[channel]
+
+    def udp_open(channel, data):
+        debug2('Incoming UDP open.\n')
+        family = int(data)
+        mux.channels[channel] = lambda cmd, data: udp_req(channel, cmd, data)
+        if channel in udphandlers:
+            raise Fatal('UDP connection channel %d already open' % channel)
+        else:
+            h = UdpProxy(mux, channel, family)
+            handlers.append(h)
+            udphandlers[channel] = h
+    mux.got_udp_open = udp_open
+
+    while mux.ok:
+        if hw.pid:
+            assert(hw.pid > 0)
+            (rpid, rv) = os.waitpid(hw.pid, os.WNOHANG)
+            if rpid:
+                raise Fatal(
+                    'hostwatch exited unexpectedly: code 0x%04x\n' % rv)
+
+        ssnet.runonce(handlers, mux)
+        if latency_control:
+            mux.check_fullness()
+
+        if dnshandlers:
+            now = time.time()
+            remove = []
+            for channel, h in dnshandlers.items():
+                if h.timeout < now or not h.ok:
+                    debug3('expiring dnsreqs channel=%d\n' % channel)
+                    remove.append(channel)
+                    h.ok = False
+            for channel in remove:
+                del dnshandlers[channel]
+        if udphandlers:
+            remove = []
+            for channel, h in udphandlers.items():
+                if not h.ok:
+                    debug3('expiring UDP channel=%d\n' % channel)
+                    remove.append(channel)
+                    h.ok = False
+            for channel in remove:
+                del udphandlers[channel]

sshuttle/ssh.py

@@ -0,0 +1,130 @@
+import sys
+import os
+import re
+import socket
+import zlib
+import imp
+import subprocess as ssubprocess
+import sshuttle.helpers as helpers
+from sshuttle.helpers import debug2
+
+
+def readfile(name):
+    tokens = name.split(".")
+    f = None
+
+    token = tokens[0]
+    token_name = [token]
+    token_str = ".".join(token_name)
+
+    try:
+        f, pathname, description = imp.find_module(token_str)
+
+        for token in tokens[1:]:
+            module = imp.load_module(token_str, f, pathname, description)
+            if f is not None:
+                f.close()
+
+            token_name.append(token)
+            token_str = ".".join(token_name)
+
+            f, pathname, description = imp.find_module(
+                token, module.__path__)
+
+        if f is not None:
+            contents = f.read()
+        else:
+            contents = ""
+
+    finally:
+        if f is not None:
+            f.close()
+
+    return contents.encode("UTF8")
+
+
+def empackage(z, name, data=None):
+    if not data:
+        data = readfile(name)
+    content = z.compress(data)
+    content += z.flush(zlib.Z_SYNC_FLUSH)
+
+    return b'%s\n%d\n%s' % (name.encode("ASCII"), len(content), content)
+
+
+def connect(ssh_cmd, rhostport, python, stderr, options):
+    portl = []
+
+    if (rhostport or '').count(':') > 1:
+        if rhostport.count(']') or rhostport.count('['):
+            result = rhostport.split(']')
+            rhost = result[0].strip('[')
+            if len(result) > 1:
+                result[1] = result[1].strip(':')
+                if result[1] is not '':
+                    portl = ['-p', str(int(result[1]))]
+        # can't disambiguate IPv6 colons and a port number. pass the hostname
+        # through.
+        else:
+            rhost = rhostport
+    else:  # IPv4
+        l = (rhostport or '').split(':', 1)
+        rhost = l[0]
+        if len(l) > 1:
+            portl = ['-p', str(int(l[1]))]
+
+    if rhost == '-':
+        rhost = None
+
+    z = zlib.compressobj(1)
+    content = readfile('sshuttle.assembler')
+    optdata = ''.join("%s=%r\n" % (k, v) for (k, v) in list(options.items()))
+    optdata = optdata.encode("UTF8")
+    content2 = (empackage(z, 'sshuttle') +
+                empackage(z, 'sshuttle.cmdline_options', optdata) +
+                empackage(z, 'sshuttle.helpers') +
+                empackage(z, 'sshuttle.ssnet') +
+                empackage(z, 'sshuttle.hostwatch') +
+                empackage(z, 'sshuttle.server') +
+                b"\n")
+
+    pyscript = r"""
+                import sys;
+                verbosity=%d;
+                stdin=getattr(sys.stdin,"buffer",sys.stdin);
+                exec(compile(stdin.read(%d), "assembler.py", "exec"))
+                """ % (helpers.verbose or 0, len(content))
+    pyscript = re.sub(r'\s+', ' ', pyscript.strip())
+
+    if not rhost:
+        # ignore the --python argument when running locally; we already know
+        # which python version works.
+        argv = [sys.argv[1], '-c', pyscript]
+    else:
+        if ssh_cmd:
+            sshl = ssh_cmd.split(' ')
+        else:
+            sshl = ['ssh']
+        if python:
+            pycmd = "'%s' -c '%s'" % (python, pyscript)
+        else:
+            pycmd = ("P=python3.5; $P -V 2>/dev/null || P=python; "
+                     "exec \"$P\" -c '%s'") % pyscript
+        argv = (sshl +
+                portl +
+                [rhost, '--', pycmd])
+    (s1, s2) = socket.socketpair()
+
+    def setup():
+        # runs in the child process
+        s2.close()
+    s1a, s1b = os.dup(s1.fileno()), os.dup(s1.fileno())
+    s1.close()
+    debug2('executing: %r\n' % argv)
+    p = ssubprocess.Popen(argv, stdin=s1a, stdout=s1b, preexec_fn=setup,
+                          close_fds=True, stderr=stderr)
+    os.close(s1a)
+    os.close(s1b)
+    s2.sendall(content)
+    s2.sendall(content2)
+    return p, s2

sshuttle/ssnet.py

@@ -1,9 +1,12 @@
-import struct, socket, errno, select
-if not globals().get('skip_imports'):
-    from helpers import *
+import struct
+import socket
+import errno
+import select
+import os
+from sshuttle.helpers import log, debug1, debug2, debug3, Fatal
 
 MAX_CHANNEL = 65535
-    
+
 # these don't exist in the socket module in python 2.3!
 SHUT_RD = 0
 SHUT_WR = 1
@@ -16,35 +19,45 @@ HDR_LEN = 8
 CMD_EXIT = 0x4200
 CMD_PING = 0x4201
 CMD_PONG = 0x4202
-CMD_CONNECT = 0x4203
-CMD_STOP_SENDING = 0x4204
-CMD_EOF = 0x4205
-CMD_DATA = 0x4206
+CMD_TCP_CONNECT = 0x4203
+CMD_TCP_STOP_SENDING = 0x4204
+CMD_TCP_EOF = 0x4205
+CMD_TCP_DATA = 0x4206
 CMD_ROUTES = 0x4207
 CMD_HOST_REQ = 0x4208
 CMD_HOST_LIST = 0x4209
 CMD_DNS_REQ = 0x420a
 CMD_DNS_RESPONSE = 0x420b
+CMD_UDP_OPEN = 0x420c
+CMD_UDP_DATA = 0x420d
+CMD_UDP_CLOSE = 0x420e
 
 cmd_to_name = {
     CMD_EXIT: 'EXIT',
     CMD_PING: 'PING',
     CMD_PONG: 'PONG',
-    CMD_CONNECT: 'CONNECT',
-    CMD_STOP_SENDING: 'STOP_SENDING',
-    CMD_EOF: 'EOF',
-    CMD_DATA: 'DATA',
+    CMD_TCP_CONNECT: 'TCP_CONNECT',
+    CMD_TCP_STOP_SENDING: 'TCP_STOP_SENDING',
+    CMD_TCP_EOF: 'TCP_EOF',
+    CMD_TCP_DATA: 'TCP_DATA',
     CMD_ROUTES: 'ROUTES',
     CMD_HOST_REQ: 'HOST_REQ',
     CMD_HOST_LIST: 'HOST_LIST',
     CMD_DNS_REQ: 'DNS_REQ',
     CMD_DNS_RESPONSE: 'DNS_RESPONSE',
+    CMD_UDP_OPEN: 'UDP_OPEN',
+    CMD_UDP_DATA: 'UDP_DATA',
+    CMD_UDP_CLOSE: 'UDP_CLOSE',
 }
-    
+
+
+NET_ERRS = [errno.ECONNREFUSED, errno.ETIMEDOUT,
+            errno.EHOSTUNREACH, errno.ENETUNREACH,
+            errno.EHOSTDOWN, errno.ENETDOWN]
 
 
 def _add(l, elem):
-    if not elem in l:
+    if elem not in l:
         l.append(elem)
 
 
@@ -62,7 +75,7 @@ def _fds(l):
 def _nb_clean(func, *args):
     try:
         return func(*args)
-    except OSError, e:
+    except OSError as e:
         if e.errno not in (errno.EWOULDBLOCK, errno.EAGAIN):
             raise
         else:
@@ -75,14 +88,17 @@ def _try_peername(sock):
         pn = sock.getpeername()
         if pn:
             return '%s:%s' % (pn[0], pn[1])
-    except socket.error, e:
+    except socket.error as e:
         if e.args[0] not in (errno.ENOTCONN, errno.ENOTSOCK):
             raise
     return 'unknown'
 
 
 _swcount = 0
+
+
 class SockWrapper:
+
     def __init__(self, rsock, wsock, connect_to=None, peername=None):
         global _swcount
         _swcount += 1
@@ -128,7 +144,7 @@ class SockWrapper:
             self.rsock.connect(self.connect_to)
             # connected successfully (Linux)
             self.connect_to = None
-        except socket.error, e:
+        except socket.error as e:
             debug3('%r: connect result: %s\n' % (self, e))
             if e.args[0] == errno.EINVAL:
                 # this is what happens when you call connect() on a socket
@@ -142,12 +158,21 @@ class SockWrapper:
                 debug3('%r: fixed connect result: %s\n' % (self, e))
             if e.args[0] in [errno.EINPROGRESS, errno.EALREADY]:
                 pass  # not connected yet
+            elif e.args[0] == 0:
+                # connected successfully (weird Linux bug?)
+                # Sometimes Linux seems to return EINVAL when it isn't
+                # invalid.  This *may* be caused by a race condition
+                # between connect() and getsockopt(SO_ERROR) (ie. it
+                # finishes connecting in between the two, so there is no
+                # longer an error).  However, I'm not sure of that.
+                #
+                # I did get at least one report that the problem went away
+                # when we added this, however.
+                self.connect_to = None
             elif e.args[0] == errno.EISCONN:
                 # connected successfully (BSD)
                 self.connect_to = None
-            elif e.args[0] in [errno.ECONNREFUSED, errno.ETIMEDOUT,
-                               errno.EHOSTUNREACH, errno.ENETUNREACH,
-                               errno.EACCES, errno.EPERM]:
+            elif e.args[0] in NET_ERRS + [errno.EACCES, errno.EPERM]:
                 # a "normal" kind of error
                 self.connect_to = None
                 self.seterr(e)
@@ -158,15 +183,15 @@ class SockWrapper:
         if not self.shut_read:
             debug2('%r: done reading\n' % self)
             self.shut_read = True
-            #self.rsock.shutdown(SHUT_RD)  # doesn't do anything anyway
-        
+            # self.rsock.shutdown(SHUT_RD)  # doesn't do anything anyway
+
     def nowrite(self):
         if not self.shut_write:
             debug2('%r: done writing\n' % self)
             self.shut_write = True
             try:
                 self.wsock.shutdown(SHUT_WR)
-            except socket.error, e:
+            except socket.error as e:
                 self.seterr('nowrite: %s' % e)
 
     def too_full(self):
@@ -178,7 +203,7 @@ class SockWrapper:
         self.wsock.setblocking(False)
         try:
             return _nb_clean(os.write, self.wsock.fileno(), buf)
-        except OSError, e:
+        except OSError as e:
             if e.errno == errno.EPIPE:
                 debug1('%r: uwrite: got EPIPE\n' % self)
                 self.nowrite()
@@ -187,7 +212,7 @@ class SockWrapper:
                 # unexpected error... stream is dead
                 self.seterr('uwrite: %s' % e)
                 return 0
-        
+
     def write(self, buf):
         assert(buf)
         return self.uwrite(buf)
@@ -200,9 +225,9 @@ class SockWrapper:
         self.rsock.setblocking(False)
         try:
             return _nb_clean(os.read, self.rsock.fileno(), 65536)
-        except OSError, e:
+        except OSError as e:
             self.seterr('uread: %s' % e)
-            return '' # unexpected error... we'll call it EOF
+            return b''  # unexpected error... we'll call it EOF
 
     def fill(self):
         if self.buf:
@@ -210,7 +235,7 @@ class SockWrapper:
         rb = self.uread()
         if rb:
             self.buf.append(rb)
-        if rb == '':  # empty string means EOF; None means temporarily empty
+        if rb == b'':  # empty string means EOF; None means temporarily empty
             self.noread()
 
     def copy_to(self, outwrap):
@@ -224,7 +249,8 @@ class SockWrapper:
 
 
 class Handler:
-    def __init__(self, socks = None, callback = None):
+
+    def __init__(self, socks=None, callback=None):
         self.ok = True
         self.socks = socks or []
         if callback:
@@ -234,9 +260,9 @@ class Handler:
         for i in self.socks:
             _add(r, i)
 
-    def callback(self):
+    def callback(self, sock):
         log('--no callback defined-- %r\n' % self)
-        (r,w,x) = select.select(self.socks, [], [], 0)
+        (r, w, x) = select.select(self.socks, [], [], 0)
         for s in r:
             v = s.recv(4096)
             if not v:
@@ -246,6 +272,7 @@ class Handler:
 
 
 class Proxy(Handler):
+
     def __init__(self, wrap1, wrap2):
         Handler.__init__(self, [wrap1.rsock, wrap1.wsock,
                                 wrap2.rsock, wrap2.wsock])
@@ -253,9 +280,11 @@ class Proxy(Handler):
         self.wrap2 = wrap2
 
     def pre_select(self, r, w, x):
-        if self.wrap1.shut_write: self.wrap2.noread()
-        if self.wrap2.shut_write: self.wrap1.noread()
-        
+        if self.wrap1.shut_write:
+            self.wrap2.noread()
+        if self.wrap2.shut_write:
+            self.wrap1.noread()
+
         if self.wrap1.connect_to:
             _add(w, self.wrap1.rsock)
         elif self.wrap1.buf:
@@ -272,7 +301,7 @@ class Proxy(Handler):
         elif not self.wrap2.shut_read:
             _add(r, self.wrap2.rsock)
 
-    def callback(self):
+    def callback(self, sock):
         self.wrap1.try_connect()
         self.wrap2.try_connect()
         self.wrap1.fill()
@@ -286,31 +315,33 @@ class Proxy(Handler):
             self.wrap2.buf = []
             self.wrap2.noread()
         if (self.wrap1.shut_read and self.wrap2.shut_read and
-            not self.wrap1.buf and not self.wrap2.buf):
+                not self.wrap1.buf and not self.wrap2.buf):
             self.ok = False
             self.wrap1.nowrite()
             self.wrap2.nowrite()
 
 
 class Mux(Handler):
+
     def __init__(self, rsock, wsock):
         Handler.__init__(self, [rsock, wsock])
         self.rsock = rsock
         self.wsock = wsock
         self.new_channel = self.got_dns_req = self.got_routes = None
+        self.got_udp_open = self.got_udp_data = self.got_udp_close = None
         self.got_host_req = self.got_host_list = None
         self.channels = {}
         self.chani = 0
         self.want = 0
-        self.inbuf = ''
+        self.inbuf = b''
         self.outbuf = []
         self.fullness = 0
         self.too_full = False
-        self.send(0, CMD_PING, 'chicken')
+        self.send(0, CMD_PING, b'chicken')
 
     def next_channel(self):
         # channel 0 is special, so we never allocate it
-        for timeout in xrange(1024):
+        for timeout in range(1024):
             self.chani += 1
             if self.chani > MAX_CHANNEL:
                 self.chani = 1
@@ -322,31 +353,31 @@ class Mux(Handler):
         for b in self.outbuf:
             total += len(b)
         return total
-            
+
     def check_fullness(self):
         if self.fullness > 32768:
             if not self.too_full:
-                self.send(0, CMD_PING, 'rttest')
+                self.send(0, CMD_PING, b'rttest')
             self.too_full = True
-        #ob = []
-        #for b in self.outbuf:
+        # ob = []
+        # for b in self.outbuf:
         #    (s1,s2,c) = struct.unpack('!ccH', b[:4])
         #    ob.append(c)
-        #log('outbuf: %d %r\n' % (self.amount_queued(), ob))
-        
+        # log('outbuf: %d %r\n' % (self.amount_queued(), ob))
+
     def send(self, channel, cmd, data):
-        data = str(data)
-        assert(len(data) <= 65535)
-        p = struct.pack('!ccHHH', 'S', 'S', channel, cmd, len(data)) + data
+        assert isinstance(data, bytes)
+        assert len(data) <= 65535
+        p = struct.pack('!ccHHH', b'S', b'S', channel, cmd, len(data)) + data
         self.outbuf.append(p)
         debug2(' > channel=%d cmd=%s len=%d (fullness=%d)\n'
-               % (channel, cmd_to_name.get(cmd,hex(cmd)),
+               % (channel, cmd_to_name.get(cmd, hex(cmd)),
                   len(data), self.fullness))
         self.fullness += len(data)
 
     def got_packet(self, channel, cmd, data):
-        debug2('<  channel=%d cmd=%s len=%d\n' 
-               % (channel, cmd_to_name.get(cmd,hex(cmd)), len(data)))
+        debug2('<  channel=%d cmd=%s len=%d\n'
+               % (channel, cmd_to_name.get(cmd, hex(cmd)), len(data)))
         if cmd == CMD_PING:
             self.send(0, CMD_PONG, data)
         elif cmd == CMD_PONG:
@@ -355,7 +386,7 @@ class Mux(Handler):
             self.fullness = 0
         elif cmd == CMD_EXIT:
             self.ok = False
-        elif cmd == CMD_CONNECT:
+        elif cmd == CMD_TCP_CONNECT:
             assert(not self.channels.get(channel))
             if self.new_channel:
                 self.new_channel(channel, data)
@@ -363,6 +394,10 @@ class Mux(Handler):
             assert(not self.channels.get(channel))
             if self.got_dns_req:
                 self.got_dns_req(channel, data)
+        elif cmd == CMD_UDP_OPEN:
+            assert(not self.channels.get(channel))
+            if self.got_udp_open:
+                self.got_udp_open(channel, data)
         elif cmd == CMD_ROUTES:
             if self.got_routes:
                 self.got_routes(data)
@@ -381,8 +416,8 @@ class Mux(Handler):
         else:
             callback = self.channels.get(channel)
             if not callback:
-                log('warning: closed channel %d got cmd=%s len=%d\n' 
-                       % (channel, cmd_to_name.get(cmd,hex(cmd)), len(data)))
+                log('warning: closed channel %d got cmd=%s len=%d\n'
+                    % (channel, cmd_to_name.get(cmd, hex(cmd)), len(data)))
             else:
                 callback(cmd, data)
 
@@ -400,24 +435,24 @@ class Mux(Handler):
         self.rsock.setblocking(False)
         try:
             b = _nb_clean(os.read, self.rsock.fileno(), 32768)
-        except OSError, e:
+        except OSError as e:
             raise Fatal('other end: %r' % e)
-        #log('<<< %r\n' % b)
-        if b == '': # EOF
+        # log('<<< %r\n' % b)
+        if b == b'':  # EOF
             self.ok = False
         if b:
             self.inbuf += b
 
     def handle(self):
         self.fill()
-        #log('inbuf is: (%d,%d) %r\n'
+        # log('inbuf is: (%d,%d) %r\n'
         #     % (self.want, len(self.inbuf), self.inbuf))
         while 1:
             if len(self.inbuf) >= (self.want or HDR_LEN):
-                (s1,s2,channel,cmd,datalen) = \
+                (s1, s2, channel, cmd, datalen) = \
                     struct.unpack('!ccHHH', self.inbuf[:HDR_LEN])
-                assert(s1 == 'S')
-                assert(s2 == 'S')
+                assert(s1 == b'S')
+                assert(s2 == b'S')
                 self.want = datalen + HDR_LEN
             if self.want and len(self.inbuf) >= self.want:
                 data = self.inbuf[HDR_LEN:self.want]
@@ -432,8 +467,8 @@ class Mux(Handler):
         if self.outbuf:
             _add(w, self.wsock)
 
-    def callback(self):
-        (r,w,x) = select.select([self.rsock], [self.wsock], [], 0)
+    def callback(self, sock):
+        (r, w, x) = select.select([self.rsock], [self.wsock], [], 0)
         if self.rsock in r:
             self.handle()
         if self.outbuf and self.wsock in w:
@@ -441,6 +476,7 @@ class Mux(Handler):
 
 
 class MuxWrapper(SockWrapper):
+
     def __init__(self, mux, channel):
         SockWrapper.__init__(self, mux.rsock, mux.wsock)
         self.mux = mux
@@ -454,22 +490,25 @@ class MuxWrapper(SockWrapper):
         SockWrapper.__del__(self)
 
     def __repr__(self):
-        return 'SW%r:Mux#%d' % (self.peername,self.channel)
+        return 'SW%r:Mux#%d' % (self.peername, self.channel)
 
     def noread(self):
         if not self.shut_read:
+            debug2('%r: done reading\n' % self)
             self.shut_read = True
-            self.mux.send(self.channel, CMD_STOP_SENDING, '')
+            self.mux.send(self.channel, CMD_TCP_STOP_SENDING, b'')
             self.maybe_close()
 
     def nowrite(self):
         if not self.shut_write:
+            debug2('%r: done writing\n' % self)
             self.shut_write = True
-            self.mux.send(self.channel, CMD_EOF, '')
+            self.mux.send(self.channel, CMD_TCP_EOF, b'')
             self.maybe_close()
 
     def maybe_close(self):
         if self.shut_read and self.shut_write:
+            debug2('%r: closing connection\n' % self)
             # remove the mux's reference to us.  The python garbage collector
             # will then be able to reap our object.
             self.mux.channels[self.channel] = None
@@ -482,59 +521,59 @@ class MuxWrapper(SockWrapper):
             return 0  # too much already enqueued
         if len(buf) > 2048:
             buf = buf[:2048]
-        self.mux.send(self.channel, CMD_DATA, buf)
+        self.mux.send(self.channel, CMD_TCP_DATA, buf)
         return len(buf)
 
     def uread(self):
         if self.shut_read:
-            return '' # EOF
+            return b''  # EOF
         else:
             return None  # no data available right now
 
     def got_packet(self, cmd, data):
-        if cmd == CMD_EOF:
+        if cmd == CMD_TCP_EOF:
             self.noread()
-        elif cmd == CMD_STOP_SENDING:
+        elif cmd == CMD_TCP_STOP_SENDING:
             self.nowrite()
-        elif cmd == CMD_DATA:
+        elif cmd == CMD_TCP_DATA:
             self.buf.append(data)
         else:
-            raise Exception('unknown command %d (%d bytes)' 
+            raise Exception('unknown command %d (%d bytes)'
                             % (cmd, len(data)))
 
 
-def connect_dst(ip, port):
+def connect_dst(family, ip, port):
     debug2('Connecting to %s:%d\n' % (ip, port))
-    outsock = socket.socket()
+    outsock = socket.socket(family)
     outsock.setsockopt(socket.SOL_IP, socket.IP_TTL, 42)
     return SockWrapper(outsock, outsock,
-                       connect_to = (ip,port),
-                       peername = '%s:%d' % (ip,port))
+                       connect_to=(ip, port),
+                       peername = '%s:%d' % (ip, port))
 
 
 def runonce(handlers, mux):
     r = []
     w = []
     x = []
-    to_remove = filter(lambda s: not s.ok, handlers)
+    to_remove = [s for s in handlers if not s.ok]
     for h in to_remove:
         handlers.remove(h)
 
     for s in handlers:
-        s.pre_select(r,w,x)
-    debug2('Waiting: %d r=%r w=%r x=%r (fullness=%d/%d)\n' 
-            % (len(handlers), _fds(r), _fds(w), _fds(x),
+        s.pre_select(r, w, x)
+    debug2('Waiting: %d r=%r w=%r x=%r (fullness=%d/%d)\n'
+           % (len(handlers), _fds(r), _fds(w), _fds(x),
                mux.fullness, mux.too_full))
-    (r,w,x) = select.select(r,w,x)
-    debug2('  Ready: %d r=%r w=%r x=%r\n' 
-        % (len(handlers), _fds(r), _fds(w), _fds(x)))
-    ready = r+w+x
+    (r, w, x) = select.select(r, w, x)
+    debug2('  Ready: %d r=%r w=%r x=%r\n'
+           % (len(handlers), _fds(r), _fds(w), _fds(x)))
+    ready = r + w + x
     did = {}
     for h in handlers:
         for s in h.socks:
             if s in ready:
-                h.callback()
+                h.callback(s)
                 did[s] = 1
     for s in ready:
-        if not s in did:
+        if s not in did:
             raise Fatal('socket %r was not used by any handler' % s)

sshuttle/ssyslog.py

@@ -1,8 +1,11 @@
-import sys, os
-from compat import ssubprocess
+import sys
+import os
+import subprocess as ssubprocess
 
 
 _p = None
+
+
 def start_syslog():
     global _p
     _p = ssubprocess.Popen(['logger',

sshuttle/stresstest.py

@@ -1,5 +1,8 @@
 #!/usr/bin/env python
-import sys, os, socket, select, struct, time
+import socket
+import select
+import struct
+import time
 
 listener = socket.socket()
 listener.bind(('127.0.0.1', 0))
@@ -22,63 +25,63 @@ while 1:
         count += 1
         if count >= 16384:
             count = 1
-        print 'cli CREATING %d' % count
-        b = struct.pack('I', count) + 'x'*count
+        print('cli CREATING %d' % count)
+        b = struct.pack('I', count) + 'x' * count
         remain[c] = count
-        print 'cli  >> %r' % len(b)
+        print('cli  >> %r' % len(b))
         c.send(b)
         c.shutdown(socket.SHUT_WR)
         clients.append(c)
         r = [listener]
         time.sleep(0.1)
     else:
-        r = [listener]+servers+clients
-    print 'select(%d)' % len(r)
-    r,w,x = select.select(r, [], [], 5)
+        r = [listener] + servers + clients
+    print('select(%d)' % len(r))
+    r, w, x = select.select(r, [], [], 5)
     assert(r)
     for i in r:
         if i == listener:
-            s,addr = listener.accept()
+            s, addr = listener.accept()
             servers.append(s)
         elif i in servers:
             b = i.recv(4096)
-            print 'srv <<  %r' % len(b)
-            if not i in remain:
+            print('srv <<  %r' % len(b))
+            if i not in remain:
                 assert(len(b) >= 4)
                 want = struct.unpack('I', b[:4])[0]
                 b = b[4:]
-                #i.send('y'*want)
+                # i.send('y'*want)
             else:
                 want = remain[i]
             if want < len(b):
-                print 'weird wanted %d bytes, got %d: %r' % (want, len(b), b)
+                print('weird wanted %d bytes, got %d: %r' % (want, len(b), b))
                 assert(want >= len(b))
             want -= len(b)
             remain[i] = want
             if not b:  # EOF
                 if want:
-                    print 'weird: eof but wanted %d more' % want
+                    print('weird: eof but wanted %d more' % want)
                     assert(want == 0)
                 i.close()
                 servers.remove(i)
                 del remain[i]
             else:
-                print 'srv  >> %r' % len(b)
-                i.send('y'*len(b))
+                print('srv  >> %r' % len(b))
+                i.send('y' * len(b))
                 if not want:
                     i.shutdown(socket.SHUT_WR)
         elif i in clients:
             b = i.recv(4096)
-            print 'cli <<  %r' % len(b)
+            print('cli <<  %r' % len(b))
             want = remain[i]
             if want < len(b):
-                print 'weird wanted %d bytes, got %d: %r' % (want, len(b), b)
+                print('weird wanted %d bytes, got %d: %r' % (want, len(b), b))
                 assert(want >= len(b))
             want -= len(b)
             remain[i] = want
             if not b:  # EOF
                 if want:
-                    print 'weird: eof but wanted %d more' % want
+                    print('weird: eof but wanted %d more' % want)
                     assert(want == 0)
                 i.close()
                 clients.remove(i)

sshuttle/tests/test_firewall.py

@@ -0,0 +1,102 @@
+from mock import Mock, patch, call
+import io
+
+import sshuttle.firewall
+
+
+def setup_daemon():
+    stdin = io.StringIO(u"""ROUTES
+2,24,0,1.2.3.0
+2,32,1,1.2.3.66
+10,64,0,2404:6800:4004:80c::
+10,128,1,2404:6800:4004:80c::101f
+NSLIST
+2,1.2.3.33
+10,2404:6800:4004:80c::33
+PORTS 1024,1025,1026,1027
+GO 1
+HOST 1.2.3.3,existing
+""")
+    stdout = Mock()
+    return stdin, stdout
+
+
+def test_rewrite_etc_hosts(tmpdir):
+    orig_hosts = tmpdir.join("hosts.orig")
+    orig_hosts.write("1.2.3.3 existing\n")
+
+    new_hosts = tmpdir.join("hosts")
+    orig_hosts.copy(new_hosts)
+
+    hostmap = {
+        'myhost': '1.2.3.4',
+        'myotherhost': '1.2.3.5',
+    }
+    with patch('sshuttle.firewall.HOSTSFILE', new=str(new_hosts)):
+        sshuttle.firewall.rewrite_etc_hosts(hostmap, 10)
+
+    with new_hosts.open() as f:
+        line = f.readline()
+        s = line.split()
+        assert s == ['1.2.3.3', 'existing']
+
+        line = f.readline()
+        s = line.split()
+        assert s == ['1.2.3.4', 'myhost',
+                     '#', 'sshuttle-firewall-10', 'AUTOCREATED']
+
+        line = f.readline()
+        s = line.split()
+        assert s == ['1.2.3.5', 'myotherhost',
+                     '#', 'sshuttle-firewall-10', 'AUTOCREATED']
+
+        line = f.readline()
+        assert line == ""
+
+    with patch('sshuttle.firewall.HOSTSFILE', new=str(new_hosts)):
+        sshuttle.firewall.restore_etc_hosts(10)
+    assert orig_hosts.computehash() == new_hosts.computehash()
+
+
+@patch('sshuttle.firewall.rewrite_etc_hosts')
+@patch('sshuttle.firewall.setup_daemon')
+@patch('sshuttle.firewall.get_method')
+def test_main(mock_get_method, mock_setup_daemon, mock_rewrite_etc_hosts):
+    stdin, stdout = setup_daemon()
+    mock_setup_daemon.return_value = stdin, stdout
+
+    mock_get_method("not_auto").name = "test"
+    mock_get_method.reset_mock()
+
+    sshuttle.firewall.main("not_auto", False)
+
+    assert mock_rewrite_etc_hosts.mock_calls == [
+        call({'1.2.3.3': 'existing'}, 1024),
+        call({}, 1024),
+    ]
+
+    assert stdout.mock_calls == [
+        call.write('READY test\n'),
+        call.flush(),
+        call.write('STARTED\n'),
+        call.flush()
+    ]
+    assert mock_setup_daemon.mock_calls == [call()]
+    assert mock_get_method.mock_calls == [
+        call('not_auto'),
+        call().setup_firewall(
+            1024, 1026,
+            [(10, u'2404:6800:4004:80c::33')],
+            10,
+            [(10, 64, False, u'2404:6800:4004:80c::'),
+                (10, 128, True, u'2404:6800:4004:80c::101f')],
+            True),
+        call().setup_firewall(
+            1025, 1027,
+            [(2, u'1.2.3.33')],
+            2,
+            [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+            True),
+        call().restore_firewall(1024, 10, True),
+        call().restore_firewall(1025, 2, True),
+    ]

sshuttle/tests/test_helpers.py

@@ -0,0 +1,191 @@
+from mock import patch, call
+import sys
+import io
+import socket
+
+import sshuttle.helpers
+
+
+@patch('sshuttle.helpers.logprefix', new='prefix: ')
+@patch('sshuttle.helpers.sys.stdout')
+@patch('sshuttle.helpers.sys.stderr')
+def test_log(mock_stderr, mock_stdout):
+    sshuttle.helpers.log("message")
+    sshuttle.helpers.log("abc")
+    sshuttle.helpers.log("message 1\n")
+    sshuttle.helpers.log("message 2\nline2\nline3\n")
+    sshuttle.helpers.log("message 3\nline2\nline3")
+    assert mock_stdout.mock_calls == [
+        call.flush(),
+        call.flush(),
+        call.flush(),
+        call.flush(),
+        call.flush(),
+    ]
+    assert mock_stderr.mock_calls == [
+        call.write('prefix: message'),
+        call.flush(),
+        call.write('prefix: abc'),
+        call.flush(),
+        call.write('prefix: message 1\n'),
+        call.flush(),
+        call.write('prefix: message 2\n'),
+        call.write('---> line2\n'),
+        call.write('---> line3\n'),
+        call.flush(),
+        call.write('prefix: message 3\n'),
+        call.write('---> line2\n'),
+        call.write('---> line3\n'),
+        call.flush(),
+    ]
+
+
+@patch('sshuttle.helpers.logprefix', new='prefix: ')
+@patch('sshuttle.helpers.verbose', new=1)
+@patch('sshuttle.helpers.sys.stdout')
+@patch('sshuttle.helpers.sys.stderr')
+def test_debug1(mock_stderr, mock_stdout):
+    sshuttle.helpers.debug1("message")
+    assert mock_stdout.mock_calls == [
+        call.flush(),
+    ]
+    assert mock_stderr.mock_calls == [
+        call.write('prefix: message'),
+        call.flush(),
+    ]
+
+
+@patch('sshuttle.helpers.logprefix', new='prefix: ')
+@patch('sshuttle.helpers.verbose', new=0)
+@patch('sshuttle.helpers.sys.stdout')
+@patch('sshuttle.helpers.sys.stderr')
+def test_debug1_nop(mock_stderr, mock_stdout):
+    sshuttle.helpers.debug1("message")
+    assert mock_stdout.mock_calls == []
+    assert mock_stderr.mock_calls == []
+
+
+@patch('sshuttle.helpers.logprefix', new='prefix: ')
+@patch('sshuttle.helpers.verbose', new=2)
+@patch('sshuttle.helpers.sys.stdout')
+@patch('sshuttle.helpers.sys.stderr')
+def test_debug2(mock_stderr, mock_stdout):
+    sshuttle.helpers.debug2("message")
+    assert mock_stdout.mock_calls == [
+        call.flush(),
+    ]
+    assert mock_stderr.mock_calls == [
+        call.write('prefix: message'),
+        call.flush(),
+    ]
+
+
+@patch('sshuttle.helpers.logprefix', new='prefix: ')
+@patch('sshuttle.helpers.verbose', new=1)
+@patch('sshuttle.helpers.sys.stdout')
+@patch('sshuttle.helpers.sys.stderr')
+def test_debug2_nop(mock_stderr, mock_stdout):
+    sshuttle.helpers.debug2("message")
+    assert mock_stdout.mock_calls == []
+    assert mock_stderr.mock_calls == []
+
+
+@patch('sshuttle.helpers.logprefix', new='prefix: ')
+@patch('sshuttle.helpers.verbose', new=3)
+@patch('sshuttle.helpers.sys.stdout')
+@patch('sshuttle.helpers.sys.stderr')
+def test_debug3(mock_stderr, mock_stdout):
+    sshuttle.helpers.debug3("message")
+    assert mock_stdout.mock_calls == [
+        call.flush(),
+    ]
+    assert mock_stderr.mock_calls == [
+        call.write('prefix: message'),
+        call.flush(),
+    ]
+
+
+@patch('sshuttle.helpers.logprefix', new='prefix: ')
+@patch('sshuttle.helpers.verbose', new=2)
+@patch('sshuttle.helpers.sys.stdout')
+@patch('sshuttle.helpers.sys.stderr')
+def test_debug3_nop(mock_stderr, mock_stdout):
+    sshuttle.helpers.debug3("message")
+    assert mock_stdout.mock_calls == []
+    assert mock_stderr.mock_calls == []
+
+
+@patch('sshuttle.helpers.open', create=True)
+def test_resolvconf_nameservers(mock_open):
+    mock_open.return_value = io.StringIO(u"""
+# Generated by NetworkManager
+search pri
+nameserver 192.168.1.1
+nameserver 192.168.2.1
+nameserver 192.168.3.1
+nameserver 192.168.4.1
+nameserver 2404:6800:4004:80c::1
+nameserver 2404:6800:4004:80c::2
+nameserver 2404:6800:4004:80c::3
+nameserver 2404:6800:4004:80c::4
+""")
+
+    ns = sshuttle.helpers.resolvconf_nameservers()
+    assert ns == [
+        (2, u'192.168.1.1'), (2, u'192.168.2.1'),
+        (2, u'192.168.3.1'), (2, u'192.168.4.1'),
+        (10, u'2404:6800:4004:80c::1'), (10, u'2404:6800:4004:80c::2'),
+        (10, u'2404:6800:4004:80c::3'), (10, u'2404:6800:4004:80c::4')
+    ]
+
+
+@patch('sshuttle.helpers.open', create=True)
+def test_resolvconf_random_nameserver(mock_open):
+    mock_open.return_value = io.StringIO(u"""
+# Generated by NetworkManager
+search pri
+nameserver 192.168.1.1
+nameserver 192.168.2.1
+nameserver 192.168.3.1
+nameserver 192.168.4.1
+nameserver 2404:6800:4004:80c::1
+nameserver 2404:6800:4004:80c::2
+nameserver 2404:6800:4004:80c::3
+nameserver 2404:6800:4004:80c::4
+""")
+    ns = sshuttle.helpers.resolvconf_random_nameserver()
+    assert ns in [
+        (2, u'192.168.1.1'), (2, u'192.168.2.1'),
+        (2, u'192.168.3.1'), (2, u'192.168.4.1'),
+        (10, u'2404:6800:4004:80c::1'), (10, u'2404:6800:4004:80c::2'),
+        (10, u'2404:6800:4004:80c::3'), (10, u'2404:6800:4004:80c::4')
+    ]
+
+
+def test_islocal():
+    assert sshuttle.helpers.islocal("127.0.0.1", socket.AF_INET)
+    assert not sshuttle.helpers.islocal("192.0.2.1", socket.AF_INET)
+    assert sshuttle.helpers.islocal("::1", socket.AF_INET6)
+    assert not sshuttle.helpers.islocal("2001:db8::1", socket.AF_INET6)
+
+
+def test_family_ip_tuple():
+    assert sshuttle.helpers.family_ip_tuple("127.0.0.1") \
+        == (socket.AF_INET, "127.0.0.1")
+    assert sshuttle.helpers.family_ip_tuple("192.168.2.6") \
+        == (socket.AF_INET, "192.168.2.6")
+    assert sshuttle.helpers.family_ip_tuple("::1") \
+        == (socket.AF_INET6, "::1")
+    assert sshuttle.helpers.family_ip_tuple("2404:6800:4004:80c::1") \
+        == (socket.AF_INET6, "2404:6800:4004:80c::1")
+
+
+def test_family_to_string():
+    assert sshuttle.helpers.family_to_string(socket.AF_INET) == "AF_INET"
+    assert sshuttle.helpers.family_to_string(socket.AF_INET6) == "AF_INET6"
+    if sys.version_info < (3, 0):
+        expected = "1"
+        assert sshuttle.helpers.family_to_string(socket.AF_UNIX) == "1"
+    else:
+        expected = 'AddressFamily.AF_UNIX'
+    assert sshuttle.helpers.family_to_string(socket.AF_UNIX) == expected

sshuttle/tests/test_methods_nat.py

@@ -0,0 +1,155 @@
+import pytest
+from mock import Mock, patch, call
+import socket
+import struct
+
+from sshuttle.helpers import Fatal
+from sshuttle.methods import get_method
+
+
+def test_get_supported_features():
+    method = get_method('nat')
+    features = method.get_supported_features()
+    assert not features.ipv6
+    assert not features.udp
+    assert features.dns
+
+
+def test_get_tcp_dstip():
+    sock = Mock()
+    sock.getsockopt.return_value = struct.pack(
+        '!HHBBBB', socket.ntohs(socket.AF_INET), 1024, 127, 0, 0, 1)
+    method = get_method('nat')
+    assert method.get_tcp_dstip(sock) == ('127.0.0.1', 1024)
+    assert sock.mock_calls == [call.getsockopt(0, 80, 16)]
+
+
+def test_recv_udp():
+    sock = Mock()
+    sock.recvfrom.return_value = "11111", "127.0.0.1"
+    method = get_method('nat')
+    result = method.recv_udp(sock, 1024)
+    assert sock.mock_calls == [call.recvfrom(1024)]
+    assert result == ("127.0.0.1", None, "11111")
+
+
+def test_send_udp():
+    sock = Mock()
+    method = get_method('nat')
+    method.send_udp(sock, None, "127.0.0.1", "22222")
+    assert sock.mock_calls == [call.sendto("22222", "127.0.0.1")]
+
+
+def test_setup_tcp_listener():
+    listener = Mock()
+    method = get_method('nat')
+    method.setup_tcp_listener(listener)
+    assert listener.mock_calls == []
+
+
+def test_setup_udp_listener():
+    listener = Mock()
+    method = get_method('nat')
+    method.setup_udp_listener(listener)
+    assert listener.mock_calls == []
+
+
+def test_assert_features():
+    method = get_method('nat')
+    features = method.get_supported_features()
+    method.assert_features(features)
+
+    features.udp = True
+    with pytest.raises(Fatal):
+        method.assert_features(features)
+
+    features.ipv6 = True
+    with pytest.raises(Fatal):
+        method.assert_features(features)
+
+
+def test_firewall_command():
+    method = get_method('nat')
+    assert not method.firewall_command("somthing")
+
+
+@patch('sshuttle.methods.nat.ipt')
+@patch('sshuttle.methods.nat.ipt_ttl')
+@patch('sshuttle.methods.nat.ipt_chain_exists')
+def test_setup_firewall(mock_ipt_chain_exists, mock_ipt_ttl, mock_ipt):
+    mock_ipt_chain_exists.return_value = True
+    method = get_method('nat')
+    assert method.name == 'nat'
+
+    with pytest.raises(Exception) as excinfo:
+        method.setup_firewall(
+            1024, 1026,
+            [(10, u'2404:6800:4004:80c::33')],
+            10,
+            [(10, 64, False, u'2404:6800:4004:80c::'),
+                (10, 128, True, u'2404:6800:4004:80c::101f')],
+            True)
+    assert str(excinfo.value) \
+        == 'Address family "AF_INET6" unsupported by nat method_name'
+    assert mock_ipt_chain_exists.mock_calls == []
+    assert mock_ipt_ttl.mock_calls == []
+    assert mock_ipt.mock_calls == []
+
+    with pytest.raises(Exception) as excinfo:
+        method.setup_firewall(
+            1025, 1027,
+            [(2, u'1.2.3.33')],
+            2,
+            [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+            True)
+    assert str(excinfo.value) == 'UDP not supported by nat method_name'
+    assert mock_ipt_chain_exists.mock_calls == []
+    assert mock_ipt_ttl.mock_calls == []
+    assert mock_ipt.mock_calls == []
+
+    method.setup_firewall(
+        1025, 1027,
+        [(2, u'1.2.3.33')],
+        2,
+        [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+        False)
+    assert mock_ipt_chain_exists.mock_calls == [
+        call(2, 'nat', 'sshuttle-1025')
+    ]
+    assert mock_ipt_ttl.mock_calls == [
+        call(2, 'nat', '-A', 'sshuttle-1025', '-j', 'REDIRECT',
+             '--dest', u'1.2.3.0/24', '-p', 'tcp', '--to-ports', '1025'),
+        call(2, 'nat', '-A', 'sshuttle-1025', '-j', 'REDIRECT',
+             '--dest', u'1.2.3.33/32', '-p', 'udp',
+             '--dport', '53', '--to-ports', '1027')
+    ]
+    assert mock_ipt.mock_calls == [
+        call(2, 'nat', '-D', 'OUTPUT', '-j', 'sshuttle-1025'),
+        call(2, 'nat', '-D', 'PREROUTING', '-j', 'sshuttle-1025'),
+        call(2, 'nat', '-F', 'sshuttle-1025'),
+        call(2, 'nat', '-X', 'sshuttle-1025'),
+        call(2, 'nat', '-N', 'sshuttle-1025'),
+        call(2, 'nat', '-F', 'sshuttle-1025'),
+        call(2, 'nat', '-I', 'OUTPUT', '1', '-j', 'sshuttle-1025'),
+        call(2, 'nat', '-I', 'PREROUTING', '1', '-j', 'sshuttle-1025'),
+        call(2, 'nat', '-A', 'sshuttle-1025', '-j', 'RETURN',
+             '--dest', u'1.2.3.66/32', '-p', 'tcp')
+    ]
+    mock_ipt_chain_exists.reset_mock()
+    mock_ipt_ttl.reset_mock()
+    mock_ipt.reset_mock()
+
+    method.restore_firewall(1025, 2, False)
+    assert mock_ipt_chain_exists.mock_calls == [
+        call(2, 'nat', 'sshuttle-1025')
+    ]
+    assert mock_ipt_ttl.mock_calls == []
+    assert mock_ipt.mock_calls == [
+        call(2, 'nat', '-D', 'OUTPUT', '-j', 'sshuttle-1025'),
+        call(2, 'nat', '-D', 'PREROUTING', '-j', 'sshuttle-1025'),
+        call(2, 'nat', '-F', 'sshuttle-1025'),
+        call(2, 'nat', '-X', 'sshuttle-1025')
+    ]
+    mock_ipt_chain_exists.reset_mock()
+    mock_ipt_ttl.reset_mock()
+    mock_ipt.reset_mock()

sshuttle/tests/test_methods_pf.py

@@ -0,0 +1,403 @@
+import pytest
+from mock import Mock, patch, call, ANY
+import socket
+
+from sshuttle.methods import get_method
+from sshuttle.helpers import Fatal
+from sshuttle.methods.pf import FreeBsd, Darwin, OpenBsd
+
+
+def test_get_supported_features():
+    method = get_method('pf')
+    features = method.get_supported_features()
+    assert not features.ipv6
+    assert not features.udp
+    assert features.dns
+
+
+@patch('sshuttle.helpers.verbose', new=3)
+def test_get_tcp_dstip():
+    sock = Mock()
+    sock.getpeername.return_value = ("127.0.0.1", 1024)
+    sock.getsockname.return_value = ("127.0.0.2", 1025)
+    sock.family = socket.AF_INET
+
+    firewall = Mock()
+    firewall.pfile.readline.return_value = \
+        b"QUERY_PF_NAT_SUCCESS 127.0.0.3,1026\n"
+
+    method = get_method('pf')
+    method.set_firewall(firewall)
+    assert method.get_tcp_dstip(sock) == ('127.0.0.3', 1026)
+
+    assert sock.mock_calls == [
+        call.getpeername(),
+        call.getsockname(),
+    ]
+    assert firewall.mock_calls == [
+        call.pfile.write(b'QUERY_PF_NAT 2,6,127.0.0.1,1024,127.0.0.2,1025\n'),
+        call.pfile.flush(),
+        call.pfile.readline()
+    ]
+
+
+def test_recv_udp():
+    sock = Mock()
+    sock.recvfrom.return_value = "11111", "127.0.0.1"
+    method = get_method('pf')
+    result = method.recv_udp(sock, 1024)
+    assert sock.mock_calls == [call.recvfrom(1024)]
+    assert result == ("127.0.0.1", None, "11111")
+
+
+def test_send_udp():
+    sock = Mock()
+    method = get_method('pf')
+    method.send_udp(sock, None, "127.0.0.1", "22222")
+    assert sock.mock_calls == [call.sendto("22222", "127.0.0.1")]
+
+
+def test_setup_tcp_listener():
+    listener = Mock()
+    method = get_method('pf')
+    method.setup_tcp_listener(listener)
+    assert listener.mock_calls == []
+
+
+def test_setup_udp_listener():
+    listener = Mock()
+    method = get_method('pf')
+    method.setup_udp_listener(listener)
+    assert listener.mock_calls == []
+
+
+def test_assert_features():
+    method = get_method('pf')
+    features = method.get_supported_features()
+    method.assert_features(features)
+
+    features.udp = True
+    with pytest.raises(Fatal):
+        method.assert_features(features)
+
+    features.ipv6 = True
+    with pytest.raises(Fatal):
+        method.assert_features(features)
+
+
+@patch('sshuttle.methods.pf.pf', Darwin())
+@patch('sshuttle.methods.pf.sys.stdout')
+@patch('sshuttle.methods.pf.ioctl')
+@patch('sshuttle.methods.pf.pf_get_dev')
+def test_firewall_command_darwin(mock_pf_get_dev, mock_ioctl, mock_stdout):
+    method = get_method('pf')
+    assert not method.firewall_command("somthing")
+
+    command = "QUERY_PF_NAT %d,%d,%s,%d,%s,%d\n" % (
+        socket.AF_INET, socket.IPPROTO_TCP,
+        "127.0.0.1", 1025, "127.0.0.2", 1024)
+    assert method.firewall_command(command)
+
+    assert mock_pf_get_dev.mock_calls == [call()]
+    assert mock_ioctl.mock_calls == [
+        call(mock_pf_get_dev(), 0xc0544417, ANY),
+    ]
+    assert mock_stdout.mock_calls == [
+        call.write('QUERY_PF_NAT_SUCCESS 0.0.0.0,0\n'),
+        call.flush(),
+    ]
+
+
+@patch('sshuttle.methods.pf.pf', FreeBsd())
+@patch('sshuttle.methods.pf.sys.stdout')
+@patch('sshuttle.methods.pf.ioctl')
+@patch('sshuttle.methods.pf.pf_get_dev')
+def test_firewall_command_freebsd(mock_pf_get_dev, mock_ioctl, mock_stdout):
+    method = get_method('pf')
+    assert not method.firewall_command("somthing")
+
+    command = "QUERY_PF_NAT %d,%d,%s,%d,%s,%d\n" % (
+        socket.AF_INET, socket.IPPROTO_TCP,
+        "127.0.0.1", 1025, "127.0.0.2", 1024)
+    assert method.firewall_command(command)
+
+    assert mock_pf_get_dev.mock_calls == [call()]
+    assert mock_ioctl.mock_calls == [
+        call(mock_pf_get_dev(), 0xc04c4417, ANY),
+    ]
+    assert mock_stdout.mock_calls == [
+        call.write('QUERY_PF_NAT_SUCCESS 0.0.0.0,0\n'),
+        call.flush(),
+    ]
+
+
+@patch('sshuttle.methods.pf.pf', OpenBsd())
+@patch('sshuttle.methods.pf.sys.stdout')
+@patch('sshuttle.methods.pf.ioctl')
+@patch('sshuttle.methods.pf.pf_get_dev')
+def test_firewall_command_openbsd(mock_pf_get_dev, mock_ioctl, mock_stdout):
+    method = get_method('pf')
+    assert not method.firewall_command("somthing")
+
+    command = "QUERY_PF_NAT %d,%d,%s,%d,%s,%d\n" % (
+        socket.AF_INET, socket.IPPROTO_TCP,
+        "127.0.0.1", 1025, "127.0.0.2", 1024)
+    assert method.firewall_command(command)
+
+    assert mock_pf_get_dev.mock_calls == [call()]
+    assert mock_ioctl.mock_calls == [
+        call(mock_pf_get_dev(), 0xc0504417, ANY),
+    ]
+    assert mock_stdout.mock_calls == [
+        call.write('QUERY_PF_NAT_SUCCESS 0.0.0.0,0\n'),
+        call.flush(),
+    ]
+
+
+def pfctl(args, stdin=None):
+    if args == '-s all':
+        return (b'INFO:\nStatus: Disabled\nanother mary had a little lamb\n',
+                b'little lamb\n')
+    if args == '-E':
+        return (b'\n', b'Token : abcdefg\n')
+    return None
+
+
+@patch('sshuttle.helpers.verbose', new=3)
+@patch('sshuttle.methods.pf.pf', Darwin())
+@patch('sshuttle.methods.pf.pfctl')
+@patch('sshuttle.methods.pf.ioctl')
+@patch('sshuttle.methods.pf.pf_get_dev')
+def test_setup_firewall_darwin(mock_pf_get_dev, mock_ioctl, mock_pfctl):
+    mock_pfctl.side_effect = pfctl
+
+    method = get_method('pf')
+    assert method.name == 'pf'
+
+    with pytest.raises(Exception) as excinfo:
+        method.setup_firewall(
+            1024, 1026,
+            [(10, u'2404:6800:4004:80c::33')],
+            10,
+            [(10, 64, False, u'2404:6800:4004:80c::'),
+                (10, 128, True, u'2404:6800:4004:80c::101f')],
+            True)
+    assert str(excinfo.value) \
+        == 'Address family "AF_INET6" unsupported by pf method_name'
+    assert mock_pf_get_dev.mock_calls == []
+    assert mock_ioctl.mock_calls == []
+    assert mock_pfctl.mock_calls == []
+
+    with pytest.raises(Exception) as excinfo:
+        method.setup_firewall(
+            1025, 1027,
+            [(2, u'1.2.3.33')],
+            2,
+            [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+            True)
+    assert str(excinfo.value) == 'UDP not supported by pf method_name'
+    assert mock_pf_get_dev.mock_calls == []
+    assert mock_ioctl.mock_calls == []
+    assert mock_pfctl.mock_calls == []
+
+    method.setup_firewall(
+        1025, 1027,
+        [(2, u'1.2.3.33')],
+        2,
+        [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+        False)
+    assert mock_ioctl.mock_calls == [
+        call(mock_pf_get_dev(), 0xC4704433, ANY),
+        call(mock_pf_get_dev(), 0xCC20441A, ANY),
+        call(mock_pf_get_dev(), 0xCC20441A, ANY),
+        call(mock_pf_get_dev(), 0xC4704433, ANY),
+        call(mock_pf_get_dev(), 0xCC20441A, ANY),
+        call(mock_pf_get_dev(), 0xCC20441A, ANY),
+    ]
+    assert mock_pfctl.mock_calls == [
+        call('-f /dev/stdin', b'pass on lo\n'),
+        call('-s all'),
+        call('-a sshuttle -f /dev/stdin',
+             b'table <forward_subnets> {!1.2.3.66/32,1.2.3.0/24}\n'
+             b'table <dns_servers> {1.2.3.33}\n'
+             b'rdr pass on lo0 proto tcp '
+             b'to <forward_subnets> -> 127.0.0.1 port 1025\n'
+             b'rdr pass on lo0 proto udp '
+             b'to <dns_servers> port 53 -> 127.0.0.1 port 1027\n'
+             b'pass out route-to lo0 inet proto tcp '
+             b'to <forward_subnets> keep state\n'
+             b'pass out route-to lo0 inet proto udp '
+             b'to <dns_servers> port 53 keep state\n'),
+        call('-E'),
+    ]
+    mock_pf_get_dev.reset_mock()
+    mock_ioctl.reset_mock()
+    mock_pfctl.reset_mock()
+
+    method.restore_firewall(1025, 2, False)
+    assert mock_ioctl.mock_calls == []
+    assert mock_pfctl.mock_calls == [
+        call('-a sshuttle -F all'),
+        call("-X abcdefg"),
+    ]
+    mock_pf_get_dev.reset_mock()
+    mock_pfctl.reset_mock()
+    mock_ioctl.reset_mock()
+
+
+@patch('sshuttle.helpers.verbose', new=3)
+@patch('sshuttle.methods.pf.pf', FreeBsd())
+@patch('sshuttle.methods.pf.pfctl')
+@patch('sshuttle.methods.pf.ioctl')
+@patch('sshuttle.methods.pf.pf_get_dev')
+def test_setup_firewall_freebsd(mock_pf_get_dev, mock_ioctl, mock_pfctl):
+    mock_pfctl.side_effect = pfctl
+
+    method = get_method('pf')
+    assert method.name == 'pf'
+
+    with pytest.raises(Exception) as excinfo:
+        method.setup_firewall(
+            1024, 1026,
+            [(10, u'2404:6800:4004:80c::33')],
+            10,
+            [(10, 64, False, u'2404:6800:4004:80c::'),
+                (10, 128, True, u'2404:6800:4004:80c::101f')],
+            True)
+    assert str(excinfo.value) \
+        == 'Address family "AF_INET6" unsupported by pf method_name'
+    assert mock_pf_get_dev.mock_calls == []
+    assert mock_ioctl.mock_calls == []
+    assert mock_pfctl.mock_calls == []
+
+    with pytest.raises(Exception) as excinfo:
+        method.setup_firewall(
+            1025, 1027,
+            [(2, u'1.2.3.33')],
+            2,
+            [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+            True)
+    assert str(excinfo.value) == 'UDP not supported by pf method_name'
+    assert mock_pf_get_dev.mock_calls == []
+    assert mock_ioctl.mock_calls == []
+    assert mock_pfctl.mock_calls == []
+
+    method.setup_firewall(
+        1025, 1027,
+        [(2, u'1.2.3.33')],
+        2,
+        [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+        False)
+    assert mock_ioctl.mock_calls == [
+        call(mock_pf_get_dev(), 0xC4704433, ANY),
+        call(mock_pf_get_dev(), 0xCBE0441A, ANY),
+        call(mock_pf_get_dev(), 0xCBE0441A, ANY),
+        call(mock_pf_get_dev(), 0xC4704433, ANY),
+        call(mock_pf_get_dev(), 0xCBE0441A, ANY),
+        call(mock_pf_get_dev(), 0xCBE0441A, ANY),
+    ]
+    assert mock_pfctl.mock_calls == [
+        call('-s all'),
+        call('-a sshuttle -f /dev/stdin',
+             b'table <forward_subnets> {!1.2.3.66/32,1.2.3.0/24}\n'
+             b'table <dns_servers> {1.2.3.33}\n'
+             b'rdr pass on lo0 proto tcp '
+             b'to <forward_subnets> -> 127.0.0.1 port 1025\n'
+             b'rdr pass on lo0 proto udp '
+             b'to <dns_servers> port 53 -> 127.0.0.1 port 1027\n'
+             b'pass out route-to lo0 inet proto tcp '
+             b'to <forward_subnets> keep state\n'
+             b'pass out route-to lo0 inet proto udp '
+             b'to <dns_servers> port 53 keep state\n'),
+        call('-e'),
+    ]
+    mock_pf_get_dev.reset_mock()
+    mock_ioctl.reset_mock()
+    mock_pfctl.reset_mock()
+
+    method.restore_firewall(1025, 2, False)
+    assert mock_ioctl.mock_calls == []
+    assert mock_pfctl.mock_calls == [
+        call('-a sshuttle -F all'),
+        call("-d"),
+    ]
+    mock_pf_get_dev.reset_mock()
+    mock_pfctl.reset_mock()
+    mock_ioctl.reset_mock()
+
+
+@patch('sshuttle.helpers.verbose', new=3)
+@patch('sshuttle.methods.pf.pf', OpenBsd())
+@patch('sshuttle.methods.pf.pfctl')
+@patch('sshuttle.methods.pf.ioctl')
+@patch('sshuttle.methods.pf.pf_get_dev')
+def test_setup_firewall_openbsd(mock_pf_get_dev, mock_ioctl, mock_pfctl):
+    mock_pfctl.side_effect = pfctl
+
+    method = get_method('pf')
+    assert method.name == 'pf'
+
+    with pytest.raises(Exception) as excinfo:
+        method.setup_firewall(
+            1024, 1026,
+            [(10, u'2404:6800:4004:80c::33')],
+            10,
+            [(10, 64, False, u'2404:6800:4004:80c::'),
+                (10, 128, True, u'2404:6800:4004:80c::101f')],
+            True)
+    assert str(excinfo.value) \
+        == 'Address family "AF_INET6" unsupported by pf method_name'
+    assert mock_pf_get_dev.mock_calls == []
+    assert mock_ioctl.mock_calls == []
+    assert mock_pfctl.mock_calls == []
+
+    with pytest.raises(Exception) as excinfo:
+        method.setup_firewall(
+            1025, 1027,
+            [(2, u'1.2.3.33')],
+            2,
+            [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+            True)
+    assert str(excinfo.value) == 'UDP not supported by pf method_name'
+    assert mock_pf_get_dev.mock_calls == []
+    assert mock_ioctl.mock_calls == []
+    assert mock_pfctl.mock_calls == []
+
+    method.setup_firewall(
+        1025, 1027,
+        [(2, u'1.2.3.33')],
+        2,
+        [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+        False)
+    assert mock_ioctl.mock_calls == [
+        call(mock_pf_get_dev(), 0xcd48441a, ANY),
+        call(mock_pf_get_dev(), 0xcd48441a, ANY),
+    ]
+    assert mock_pfctl.mock_calls == [
+        call('-f /dev/stdin', b'match on lo\n'),
+        call('-s all'),
+        call('-a sshuttle -f /dev/stdin',
+             b'table <forward_subnets> {!1.2.3.66/32,1.2.3.0/24}\n'
+             b'table <dns_servers> {1.2.3.33}\n'
+             b'pass in on lo0 inet proto tcp divert-to 127.0.0.1 port 1025\n'
+             b'pass in on lo0 inet proto udp to '
+             b'<dns_servers>port 53 rdr-to 127.0.0.1 port 1027\n'
+             b'pass out inet proto tcp to '
+             b'<forward_subnets> route-to lo0 keep state\n'
+             b'pass out inet proto udp to '
+             b'<dns_servers> port 53 route-to lo0 keep state\n'),
+        call('-e'),
+    ]
+    mock_pf_get_dev.reset_mock()
+    mock_ioctl.reset_mock()
+    mock_pfctl.reset_mock()
+
+    method.restore_firewall(1025, 2, False)
+    assert mock_ioctl.mock_calls == []
+    assert mock_pfctl.mock_calls == [
+        call('-a sshuttle -F all'),
+        call("-d"),
+    ]
+    mock_pf_get_dev.reset_mock()
+    mock_pfctl.reset_mock()
+    mock_ioctl.reset_mock()

sshuttle/tests/test_methods_tproxy.py

@@ -0,0 +1,283 @@
+from mock import Mock, patch, call
+
+from sshuttle.methods import get_method
+
+
+@patch("sshuttle.methods.tproxy.recvmsg")
+def test_get_supported_features_recvmsg(mock_recvmsg):
+    method = get_method('tproxy')
+    features = method.get_supported_features()
+    assert features.ipv6
+    assert features.udp
+    assert features.dns
+
+
+@patch("sshuttle.methods.tproxy.recvmsg", None)
+def test_get_supported_features_norecvmsg():
+    method = get_method('tproxy')
+    features = method.get_supported_features()
+    assert features.ipv6
+    assert not features.udp
+    assert not features.dns
+
+
+def test_get_tcp_dstip():
+    sock = Mock()
+    sock.getsockname.return_value = ('127.0.0.1', 1024)
+    method = get_method('tproxy')
+    assert method.get_tcp_dstip(sock) == ('127.0.0.1', 1024)
+    assert sock.mock_calls == [call.getsockname()]
+
+
+@patch("sshuttle.methods.tproxy.recv_udp")
+def test_recv_udp(mock_recv_udp):
+    mock_recv_udp.return_value = ("127.0.0.1", "127.0.0.2", "11111")
+
+    sock = Mock()
+    method = get_method('tproxy')
+    result = method.recv_udp(sock, 1024)
+    assert sock.mock_calls == []
+    assert mock_recv_udp.mock_calls == [call(sock, 1024)]
+    assert result == ("127.0.0.1", "127.0.0.2", "11111")
+
+
+@patch("sshuttle.methods.socket.socket")
+def test_send_udp(mock_socket):
+    sock = Mock()
+    method = get_method('tproxy')
+    method.send_udp(sock, "127.0.0.2", "127.0.0.1", "2222222")
+    assert sock.mock_calls == []
+    assert mock_socket.mock_calls == [
+        call(sock.family, 2),
+        call().setsockopt(1, 2, 1),
+        call().setsockopt(0, 19, 1),
+        call().bind('127.0.0.2'),
+        call().sendto("2222222", '127.0.0.1'),
+        call().close()
+    ]
+
+
+def test_setup_tcp_listener():
+    listener = Mock()
+    method = get_method('tproxy')
+    method.setup_tcp_listener(listener)
+    assert listener.mock_calls == [
+        call.setsockopt(0, 19, 1)
+    ]
+
+
+def test_setup_udp_listener():
+    listener = Mock()
+    method = get_method('tproxy')
+    method.setup_udp_listener(listener)
+    assert listener.mock_calls == [
+        call.setsockopt(0, 19, 1),
+        call.v4.setsockopt(0, 20, 1),
+        call.v6.setsockopt(41, 74, 1)
+    ]
+
+
+def test_assert_features():
+    method = get_method('tproxy')
+    features = method.get_supported_features()
+    method.assert_features(features)
+
+
+def test_firewall_command():
+    method = get_method('tproxy')
+    assert not method.firewall_command("somthing")
+
+
+@patch('sshuttle.methods.tproxy.ipt')
+@patch('sshuttle.methods.tproxy.ipt_ttl')
+@patch('sshuttle.methods.tproxy.ipt_chain_exists')
+def test_setup_firewall(mock_ipt_chain_exists, mock_ipt_ttl, mock_ipt):
+    mock_ipt_chain_exists.return_value = True
+    method = get_method('tproxy')
+    assert method.name == 'tproxy'
+
+    # IPV6
+
+    method.setup_firewall(
+        1024, 1026,
+        [(10, u'2404:6800:4004:80c::33')],
+        10,
+        [(10, 64, False, u'2404:6800:4004:80c::'),
+            (10, 128, True, u'2404:6800:4004:80c::101f')],
+        True)
+    assert mock_ipt_chain_exists.mock_calls == [
+        call(10, 'mangle', 'sshuttle-m-1024'),
+        call(10, 'mangle', 'sshuttle-t-1024'),
+        call(10, 'mangle', 'sshuttle-d-1024')
+    ]
+    assert mock_ipt_ttl.mock_calls == []
+    assert mock_ipt.mock_calls == [
+        call(10, 'mangle', '-D', 'OUTPUT', '-j', 'sshuttle-m-1024'),
+        call(10, 'mangle', '-F', 'sshuttle-m-1024'),
+        call(10, 'mangle', '-X', 'sshuttle-m-1024'),
+        call(10, 'mangle', '-D', 'PREROUTING', '-j', 'sshuttle-t-1024'),
+        call(10, 'mangle', '-F', 'sshuttle-t-1024'),
+        call(10, 'mangle', '-X', 'sshuttle-t-1024'),
+        call(10, 'mangle', '-F', 'sshuttle-d-1024'),
+        call(10, 'mangle', '-X', 'sshuttle-d-1024'),
+        call(10, 'mangle', '-N', 'sshuttle-m-1024'),
+        call(10, 'mangle', '-F', 'sshuttle-m-1024'),
+        call(10, 'mangle', '-N', 'sshuttle-d-1024'),
+        call(10, 'mangle', '-F', 'sshuttle-d-1024'),
+        call(10, 'mangle', '-N', 'sshuttle-t-1024'),
+        call(10, 'mangle', '-F', 'sshuttle-t-1024'),
+        call(10, 'mangle', '-I', 'OUTPUT', '1', '-j', 'sshuttle-m-1024'),
+        call(10, 'mangle', '-I', 'PREROUTING', '1', '-j', 'sshuttle-t-1024'),
+        call(10, 'mangle', '-A', 'sshuttle-d-1024', '-j', 'MARK',
+             '--set-mark', '1'),
+        call(10, 'mangle', '-A', 'sshuttle-d-1024', '-j', 'ACCEPT'),
+        call(10, 'mangle', '-A', 'sshuttle-t-1024', '-m', 'socket',
+             '-j', 'sshuttle-d-1024', '-m', 'tcp', '-p', 'tcp'),
+        call(10, 'mangle', '-A', 'sshuttle-t-1024', '-m', 'socket',
+             '-j', 'sshuttle-d-1024', '-m', 'udp', '-p', 'udp'),
+        call(10, 'mangle', '-A', 'sshuttle-m-1024', '-j', 'MARK',
+             '--set-mark', '1', '--dest', u'2404:6800:4004:80c::33/32',
+             '-m', 'udp', '-p', 'udp', '--dport', '53'),
+        call(10, 'mangle', '-A', 'sshuttle-t-1024', '-j', 'TPROXY',
+             '--tproxy-mark', '0x1/0x1',
+             '--dest', u'2404:6800:4004:80c::33/32',
+             '-m', 'udp', '-p', 'udp', '--dport', '53', '--on-port', '1026'),
+        call(10, 'mangle', '-A', 'sshuttle-m-1024', '-j', 'RETURN',
+             '--dest', u'2404:6800:4004:80c::101f/128',
+             '-m', 'tcp', '-p', 'tcp'),
+        call(10, 'mangle', '-A', 'sshuttle-t-1024', '-j', 'RETURN',
+             '--dest', u'2404:6800:4004:80c::101f/128',
+             '-m', 'tcp', '-p', 'tcp'),
+        call(10, 'mangle', '-A', 'sshuttle-m-1024', '-j', 'RETURN',
+             '--dest', u'2404:6800:4004:80c::101f/128',
+             '-m', 'udp', '-p', 'udp'),
+        call(10, 'mangle', '-A', 'sshuttle-t-1024', '-j', 'RETURN',
+             '--dest', u'2404:6800:4004:80c::101f/128',
+             '-m', 'udp', '-p', 'udp'),
+        call(10, 'mangle', '-A', 'sshuttle-m-1024', '-j', 'MARK',
+             '--set-mark', '1', '--dest', u'2404:6800:4004:80c::/64',
+             '-m', 'tcp', '-p', 'tcp'),
+        call(10, 'mangle', '-A', 'sshuttle-t-1024', '-j', 'TPROXY',
+             '--tproxy-mark', '0x1/0x1', '--dest', u'2404:6800:4004:80c::/64',
+             '-m', 'tcp', '-p', 'tcp', '--on-port', '1024'),
+        call(10, 'mangle', '-A', 'sshuttle-m-1024', '-j', 'MARK',
+             '--set-mark', '1', '--dest', u'2404:6800:4004:80c::/64',
+             '-m', 'udp', '-p', 'udp'),
+        call(10, 'mangle', '-A', 'sshuttle-t-1024', '-j', 'TPROXY',
+             '--tproxy-mark', '0x1/0x1', '--dest', u'2404:6800:4004:80c::/64',
+             '-m', 'udp', '-p', 'udp', '--on-port', '1024')
+    ]
+    mock_ipt_chain_exists.reset_mock()
+    mock_ipt_ttl.reset_mock()
+    mock_ipt.reset_mock()
+
+    method.restore_firewall(1025, 10, True)
+    assert mock_ipt_chain_exists.mock_calls == [
+        call(10, 'mangle', 'sshuttle-m-1025'),
+        call(10, 'mangle', 'sshuttle-t-1025'),
+        call(10, 'mangle', 'sshuttle-d-1025')
+    ]
+    assert mock_ipt_ttl.mock_calls == []
+    assert mock_ipt.mock_calls == [
+        call(10, 'mangle', '-D', 'OUTPUT', '-j', 'sshuttle-m-1025'),
+        call(10, 'mangle', '-F', 'sshuttle-m-1025'),
+        call(10, 'mangle', '-X', 'sshuttle-m-1025'),
+        call(10, 'mangle', '-D', 'PREROUTING', '-j', 'sshuttle-t-1025'),
+        call(10, 'mangle', '-F', 'sshuttle-t-1025'),
+        call(10, 'mangle', '-X', 'sshuttle-t-1025'),
+        call(10, 'mangle', '-F', 'sshuttle-d-1025'),
+        call(10, 'mangle', '-X', 'sshuttle-d-1025')
+    ]
+    mock_ipt_chain_exists.reset_mock()
+    mock_ipt_ttl.reset_mock()
+    mock_ipt.reset_mock()
+
+    # IPV4
+
+    method.setup_firewall(
+        1025, 1027,
+        [(2, u'1.2.3.33')],
+        2,
+        [(2, 24, False, u'1.2.3.0'), (2, 32, True, u'1.2.3.66')],
+        True)
+    assert mock_ipt_chain_exists.mock_calls == [
+        call(2, 'mangle', 'sshuttle-m-1025'),
+        call(2, 'mangle', 'sshuttle-t-1025'),
+        call(2, 'mangle', 'sshuttle-d-1025')
+    ]
+    assert mock_ipt_ttl.mock_calls == []
+    assert mock_ipt.mock_calls == [
+        call(2, 'mangle', '-D', 'OUTPUT', '-j', 'sshuttle-m-1025'),
+        call(2, 'mangle', '-F', 'sshuttle-m-1025'),
+        call(2, 'mangle', '-X', 'sshuttle-m-1025'),
+        call(2, 'mangle', '-D', 'PREROUTING', '-j', 'sshuttle-t-1025'),
+        call(2, 'mangle', '-F', 'sshuttle-t-1025'),
+        call(2, 'mangle', '-X', 'sshuttle-t-1025'),
+        call(2, 'mangle', '-F', 'sshuttle-d-1025'),
+        call(2, 'mangle', '-X', 'sshuttle-d-1025'),
+        call(2, 'mangle', '-N', 'sshuttle-m-1025'),
+        call(2, 'mangle', '-F', 'sshuttle-m-1025'),
+        call(2, 'mangle', '-N', 'sshuttle-d-1025'),
+        call(2, 'mangle', '-F', 'sshuttle-d-1025'),
+        call(2, 'mangle', '-N', 'sshuttle-t-1025'),
+        call(2, 'mangle', '-F', 'sshuttle-t-1025'),
+        call(2, 'mangle', '-I', 'OUTPUT', '1', '-j', 'sshuttle-m-1025'),
+        call(2, 'mangle', '-I', 'PREROUTING', '1', '-j', 'sshuttle-t-1025'),
+        call(2, 'mangle', '-A', 'sshuttle-d-1025',
+             '-j', 'MARK', '--set-mark', '1'),
+        call(2, 'mangle', '-A', 'sshuttle-d-1025', '-j', 'ACCEPT'),
+        call(2, 'mangle', '-A', 'sshuttle-t-1025', '-m', 'socket',
+             '-j', 'sshuttle-d-1025', '-m', 'tcp', '-p', 'tcp'),
+        call(2, 'mangle', '-A', 'sshuttle-t-1025', '-m', 'socket',
+             '-j', 'sshuttle-d-1025', '-m', 'udp', '-p', 'udp'),
+        call(2, 'mangle', '-A', 'sshuttle-m-1025', '-j', 'MARK',
+             '--set-mark', '1', '--dest', u'1.2.3.33/32',
+             '-m', 'udp', '-p', 'udp', '--dport', '53'),
+        call(2, 'mangle', '-A', 'sshuttle-t-1025', '-j', 'TPROXY',
+             '--tproxy-mark', '0x1/0x1', '--dest', u'1.2.3.33/32',
+             '-m', 'udp', '-p', 'udp', '--dport', '53', '--on-port', '1027'),
+        call(2, 'mangle', '-A', 'sshuttle-m-1025', '-j', 'RETURN',
+             '--dest', u'1.2.3.66/32', '-m', 'tcp', '-p', 'tcp'),
+        call(2, 'mangle', '-A', 'sshuttle-t-1025', '-j', 'RETURN',
+             '--dest', u'1.2.3.66/32', '-m', 'tcp', '-p', 'tcp'),
+        call(2, 'mangle', '-A', 'sshuttle-m-1025', '-j', 'RETURN',
+             '--dest', u'1.2.3.66/32', '-m', 'udp', '-p', 'udp'),
+        call(2, 'mangle', '-A', 'sshuttle-t-1025', '-j', 'RETURN',
+             '--dest', u'1.2.3.66/32', '-m', 'udp', '-p', 'udp'),
+        call(2, 'mangle', '-A', 'sshuttle-m-1025', '-j', 'MARK',
+             '--set-mark', '1', '--dest', u'1.2.3.0/24',
+             '-m', 'tcp', '-p', 'tcp'),
+        call(2, 'mangle', '-A', 'sshuttle-t-1025', '-j', 'TPROXY',
+             '--tproxy-mark', '0x1/0x1', '--dest', u'1.2.3.0/24',
+             '-m', 'tcp', '-p', 'tcp', '--on-port', '1025'),
+        call(2, 'mangle', '-A', 'sshuttle-m-1025', '-j', 'MARK',
+             '--set-mark', '1', '--dest', u'1.2.3.0/24',
+             '-m', 'udp', '-p', 'udp'),
+        call(2, 'mangle', '-A', 'sshuttle-t-1025', '-j', 'TPROXY',
+             '--tproxy-mark', '0x1/0x1', '--dest', u'1.2.3.0/24',
+             '-m', 'udp', '-p', 'udp', '--on-port', '1025')
+    ]
+    mock_ipt_chain_exists.reset_mock()
+    mock_ipt_ttl.reset_mock()
+    mock_ipt.reset_mock()
+
+    method.restore_firewall(1025, 2, True)
+    assert mock_ipt_chain_exists.mock_calls == [
+        call(2, 'mangle', 'sshuttle-m-1025'),
+        call(2, 'mangle', 'sshuttle-t-1025'),
+        call(2, 'mangle', 'sshuttle-d-1025')
+    ]
+    assert mock_ipt_ttl.mock_calls == []
+    assert mock_ipt.mock_calls == [
+        call(2, 'mangle', '-D', 'OUTPUT', '-j', 'sshuttle-m-1025'),
+        call(2, 'mangle', '-F', 'sshuttle-m-1025'),
+        call(2, 'mangle', '-X', 'sshuttle-m-1025'),
+        call(2, 'mangle', '-D', 'PREROUTING', '-j', 'sshuttle-t-1025'),
+        call(2, 'mangle', '-F', 'sshuttle-t-1025'),
+        call(2, 'mangle', '-X', 'sshuttle-t-1025'),
+        call(2, 'mangle', '-F', 'sshuttle-d-1025'),
+        call(2, 'mangle', '-X', 'sshuttle-d-1025')
+    ]
+    mock_ipt_chain_exists.reset_mock()
+    mock_ipt_ttl.reset_mock()
+    mock_ipt.reset_mock()

tox.ini

@@ -0,0 +1,16 @@
+[tox]
+downloadcache = {toxworkdir}/cache/
+envlist =
+    py27,
+    py35,
+
+[testenv]
+basepython =
+    py27: python2.7
+    py35: python3.5
+commands =
+    py.test
+deps =
+    pytest
+    mock
+    setuptools>=17.1

ui-macos/.gitignore

@@ -1,8 +0,0 @@
-*.pyc
-*~
-/*.nib
-/debug.app
-/sources.list
-/Sshuttle VPN.app
-/*.tar.gz
-/*.zip

ui-macos/Info.plist

@@ -1,40 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>English</string>
-	<key>CFBundleDisplayName</key>
-	<string>Sshuttle VPN</string>
-	<key>CFBundleExecutable</key>
-	<string>Sshuttle</string>
-	<key>CFBundleIconFile</key>
-	<string>app.icns</string>
-	<key>CFBundleIdentifier</key>
-	<string>ca.apenwarr.Sshuttle</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>Sshuttle VPN</string>
-	<key>CFBundlePackageType</key>
-	<string>APPL</string>
-	<key>CFBundleShortVersionString</key>
-	<string>0.0.0</string>
-	<key>CFBundleSignature</key>
-	<string>????</string>
-	<key>CFBundleVersion</key>
-	<string>0.0.0</string>
-	<key>LSUIElement</key>
-	<string>1</string>
-	<key>LSHasLocalizedDisplayName</key>
-	<false/>
-	<key>NSAppleScriptEnabled</key>
-	<false/>
-	<key>NSHumanReadableCopyright</key>
-	<string>GNU LGPL Version 2</string>
-	<key>NSMainNibFile</key>
-	<string>MainMenu</string>
-	<key>NSPrincipalClass</key>
-	<string>NSApplication</string>
-</dict>
-</plist>

ui-macos/UserDefaults.plist

@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>startAtLogin</key>
-	<false/>
-	<key>autoReconnect</key>
-	<true/>
-</dict>
-</plist>

ui-macos/all.do

@@ -1 +0,0 @@
-redo-ifchange debug.app dist

ui-macos/askpass.py

@@ -1,28 +0,0 @@
-import sys, os, re, subprocess
-
-def askpass(prompt):
-    prompt = prompt.replace('"', "'")
-
-    if 'yes/no' in prompt:
-        return "yes"
-
-    script="""
-        tell application "Finder"
-            activate
-            display dialog "%s" \
-              with title "Sshuttle SSH Connection" \
-              default answer "" \
-              with icon caution \
-              with hidden answer
-        end tell
-    """ % prompt
-
-    p = subprocess.Popen(['osascript', '-e', script], stdout=subprocess.PIPE)
-    out = p.stdout.read()
-    rv = p.wait()
-    if rv:
-        return None
-    g = re.match("text returned:(.*), button returned:.*", out)
-    if not g:
-        return None
-    return g.group(1)

ui-macos/bits/.gitignore

@@ -1 +0,0 @@
-/runpython

ui-macos/bits/PkgInfo

@@ -1 +0,0 @@
-APPL????

ui-macos/bits/runpython.c

@@ -1,23 +0,0 @@
-/*
- * This rather pointless program acts like the python interpreter, except
- * it's intended to sit inside a MacOS .app package, so that its argv[0]
- * will point inside the package.
- *
- * NSApplicationMain() looks for Info.plist using the path in argv[0], which
- * goes wrong if your interpreter is /usr/bin/python.
- */
-#include <Python.h>
-#include <string.h>
-#include <unistd.h>
-
-int main(int argc, char **argv)
-{
-    char *path = strdup(argv[0]), *cptr;
-    char *args[] = {argv[0], "../Resources/main.py", NULL};
-    cptr = strrchr(path, '/');
-    if (cptr)
-	*cptr = 0;
-    chdir(path);
-    free(path);
-    return Py_Main(2, args);
-}

ui-macos/bits/runpython.do

@@ -1,5 +0,0 @@
-exec >&2
-redo-ifchange runpython.c
-gcc -Wall -o $3 runpython.c \
-	-I/usr/include/python2.5 \
-	-lpython2.5

ui-macos/clean.do

@@ -1,4 +0,0 @@
-exec >&2
-find . -name '*~' | xargs rm -f
-rm -rf *.app *.zip *.tar.gz
-rm -f bits/runpython *.nib sources.list

ui-macos/debug.app.do

@@ -1,15 +0,0 @@
-redo-ifchange bits/runpython MainMenu.nib
-rm -rf debug.app
-mkdir debug.app debug.app/Contents
-cd debug.app/Contents
-ln -s ../.. Resources
-ln -s ../.. English.lproj
-ln -s ../../Info.plist .
-ln -s ../../app.icns .
-
-mkdir MacOS
-cd MacOS
-ln -s ../../../bits/runpython Sshuttle
-
-cd ../../..
-redo-ifchange $(find debug.app -type f)

ui-macos/default.app.do

@@ -1,28 +0,0 @@
-TOP=$PWD
-redo-ifchange sources.list
-redo-ifchange Info.plist bits/runpython \
-	$(while read name newname; do echo "$name"; done <sources.list)
-
-rm -rf "$1.app"
-mkdir "$1.app" "$1.app/Contents"
-cd "$1.app/Contents"
-
-cp "$TOP/Info.plist" .
-
-mkdir MacOS
-cp "$TOP/bits/runpython" MacOS/Sshuttle
-
-mkdir Resources
-
-cd "$TOP"
-while read name newname; do
-	[ -z "$name" ] && continue
-	: "${newname:=$name}"
-	outname=$1.app/Contents/Resources/$newname
-	outdir=$(dirname "$outname")
-	[ -d "$outdir" ] || mkdir "$outdir"
-	cp "${name-$newname}" "$outname"
-done <sources.list
-
-cd "$1.app"
-redo-ifchange $(find . -type f)

ui-macos/default.app.tar.gz.do

@@ -1,5 +0,0 @@
-exec >&2
-IFS="
-"
-redo-ifchange $1.app
-tar -czf $3 $1.app/

ui-macos/default.app.zip.do

@@ -1,5 +0,0 @@
-exec >&2
-IFS="
-"
-redo-ifchange $1.app
-zip -q -r $3 $1.app/

ui-macos/default.nib.do

@@ -1,2 +0,0 @@
-redo-ifchange $1.xib
-ibtool --compile $3 $1.xib

ui-macos/dist.do

@@ -1 +0,0 @@
-redo-ifchange "Sshuttle VPN.app.zip" "Sshuttle VPN.app.tar.gz"

ui-macos/git-export.do

@@ -1,19 +0,0 @@
-# update a local branch with pregenerated output files, so people can download
-# the completed tarballs from github.  Since we don't have any real binaries,
-# our final distribution package contains mostly blobs from the source code,
-# so this doesn't cost us much extra space in the repo.
-BRANCH=dist/macos
-redo-ifchange 'Sshuttle VPN.app'
-git update-ref refs/heads/$BRANCH origin/$BRANCH '' 2>/dev/null || true
-
-export GIT_INDEX_FILE=$PWD/gitindex.tmp
-rm -f "$GIT_INDEX_FILE"
-git add -f 'Sshuttle VPN.app'
-
-MSG="MacOS precompiled app package for $(git describe)"
-TREE=$(git write-tree --prefix=ui-macos)
-git show-ref refs/heads/$BRANCH >/dev/null && PARENT="-p refs/heads/$BRANCH"
-COMMITID=$(echo "$MSG" | git commit-tree $TREE $PARENT)
-
-git update-ref refs/heads/$BRANCH $COMMITID
-rm -f "$GIT_INDEX_FILE"

ui-macos/main.py

@@ -1,367 +0,0 @@
-import sys, os, pty
-from AppKit import *
-import my, models, askpass
-
-def sshuttle_args(host, auto_nets, auto_hosts, dns, nets, debug,
-                  no_latency_control):
-    argv = [my.bundle_path('sshuttle/sshuttle', ''), '-r', host]
-    assert(argv[0])
-    if debug:
-        argv.append('-v')
-    if auto_nets:
-        argv.append('--auto-nets')
-    if auto_hosts:
-        argv.append('--auto-hosts')
-    if dns:
-        argv.append('--dns')
-    if no_latency_control:
-        argv.append('--no-latency-control')
-    argv += nets
-    return argv
-
-
-class _Callback(NSObject):
-    def initWithFunc_(self, func):
-        self = super(_Callback, self).init()
-        self.func = func
-        return self
-    def func_(self, obj):
-        return self.func(obj)
-
-
-class Callback:
-    def __init__(self, func):
-        self.obj = _Callback.alloc().initWithFunc_(func)
-        self.sel = self.obj.func_
-
-
-class Runner:
-    def __init__(self, argv, logfunc, promptfunc, serverobj):
-        print 'in __init__'
-        self.id = argv
-        self.rv = None
-        self.pid = None
-        self.fd = None
-        self.logfunc = logfunc
-        self.promptfunc = promptfunc
-        self.serverobj = serverobj
-        self.buf = ''
-        self.logfunc('\nConnecting to %s.\n' % self.serverobj.host())
-        print 'will run: %r' % argv
-        self.serverobj.setConnected_(False)
-        pid,fd = pty.fork()
-        if pid == 0:
-            # child
-            try:
-                os.execvp(argv[0], argv)
-            except Exception, e:
-                sys.stderr.write('failed to start: %r\n' % e)
-                raise
-            finally:
-                os._exit(42)
-        # parent
-        self.pid = pid
-        self.file = NSFileHandle.alloc()\
-               .initWithFileDescriptor_closeOnDealloc_(fd, True)
-        self.cb = Callback(self.gotdata)
-        NSNotificationCenter.defaultCenter()\
-            .addObserver_selector_name_object_(self.cb.obj, self.cb.sel,
-                        NSFileHandleDataAvailableNotification, self.file)
-        self.file.waitForDataInBackgroundAndNotify()
-
-    def __del__(self):
-        self.wait()
-
-    def _try_wait(self, options):
-        if self.rv == None and self.pid > 0:
-            pid,code = os.waitpid(self.pid, options)
-            if pid == self.pid:
-                if os.WIFEXITED(code):
-                    self.rv = os.WEXITSTATUS(code)
-                else:
-                    self.rv = -os.WSTOPSIG(code)
-                self.serverobj.setConnected_(False)
-                self.serverobj.setError_('VPN process died')
-                self.logfunc('Disconnected.\n')
-        print 'wait_result: %r' % self.rv
-        return self.rv
-
-    def wait(self):
-        return self._try_wait(0)
-        
-    def poll(self):
-        return self._try_wait(os.WNOHANG)
-
-    def kill(self):
-        assert(self.pid > 0)
-        print 'killing: pid=%r rv=%r' % (self.pid, self.rv)
-        if self.rv == None:
-            self.logfunc('Disconnecting from %s.\n' % self.serverobj.host())
-            os.kill(self.pid, 15)
-            self.wait()
-
-    def gotdata(self, notification):
-        print 'gotdata!'
-        d = str(self.file.availableData())
-        if d:
-            self.logfunc(d)
-            self.buf = self.buf + d
-            if 'Connected.\r\n' in self.buf:
-                self.serverobj.setConnected_(True)
-            self.buf = self.buf[-4096:]
-            if self.buf.strip().endswith(':'):
-                lastline = self.buf.rstrip().split('\n')[-1]
-                resp = self.promptfunc(lastline)
-                add = ' (response)\n'
-                self.buf += add
-                self.logfunc(add)
-                self.file.writeData_(my.Data(resp + '\n'))
-            self.file.waitForDataInBackgroundAndNotify()
-        self.poll()
-        #print 'gotdata done!'
-
-
-class SshuttleApp(NSObject):
-    def initialize(self):
-        d = my.PList('UserDefaults') 
-        my.Defaults().registerDefaults_(d)
-
-
-class SshuttleController(NSObject):
-    # Interface builder outlets
-    startAtLoginField = objc.IBOutlet()
-    autoReconnectField = objc.IBOutlet()
-    debugField = objc.IBOutlet()
-    routingField = objc.IBOutlet()
-    prefsWindow = objc.IBOutlet()
-    serversController = objc.IBOutlet()
-    logField = objc.IBOutlet()
-    latencyControlField = objc.IBOutlet()
-    
-    servers = []
-    conns = {}
-
-    def _connect(self, server):
-        host = server.host()
-        print 'connecting %r' % host
-        self.fill_menu()
-        def logfunc(msg):
-            print 'log! (%d bytes)' % len(msg)
-            self.logField.textStorage()\
-                .appendAttributedString_(NSAttributedString.alloc()\
-                                         .initWithString_(msg))
-            self.logField.didChangeText()
-        def promptfunc(prompt):
-            print 'prompt! %r' % prompt
-            return askpass.askpass(prompt)
-        nets_mode = server.autoNets()
-        if nets_mode == models.NET_MANUAL:
-            manual_nets = ["%s/%d" % (i.subnet(), i.width())
-                           for i in server.nets()]
-        elif nets_mode == models.NET_ALL:
-            manual_nets = ['0/0']
-        else:
-            manual_nets = []
-        noLatencyControl = (server.latencyControl() != models.LAT_INTERACTIVE)
-        conn = Runner(sshuttle_args(host,
-                                    auto_nets = nets_mode == models.NET_AUTO,
-                                    auto_hosts = server.autoHosts(),
-                                    dns = server.useDns(),
-                                    nets = manual_nets,
-                                    debug = self.debugField.state(),
-                                    no_latency_control = noLatencyControl),
-                      logfunc=logfunc, promptfunc=promptfunc,
-                      serverobj=server)
-        self.conns[host] = conn
-
-    def _disconnect(self, server):
-        host = server.host()
-        print 'disconnecting %r' % host
-        conn = self.conns.get(host)
-        if conn:
-            conn.kill()
-        self.fill_menu()
-        self.logField.textStorage().setAttributedString_(
-                        NSAttributedString.alloc().initWithString_(''))
-    
-    @objc.IBAction
-    def cmd_connect(self, sender):
-        server = sender.representedObject()
-        server.setWantConnect_(True)
-
-    @objc.IBAction
-    def cmd_disconnect(self, sender):
-        server = sender.representedObject()
-        server.setWantConnect_(False)
-
-    @objc.IBAction
-    def cmd_show(self, sender):
-        self.prefsWindow.makeKeyAndOrderFront_(self)
-        NSApp.activateIgnoringOtherApps_(True)
-
-    @objc.IBAction
-    def cmd_quit(self, sender):
-        NSApp.performSelector_withObject_afterDelay_(NSApp.terminate_,
-                                                     None, 0.0)
-
-    def fill_menu(self):
-        menu = self.menu
-        menu.removeAllItems()
-
-        def additem(name, func, obj):
-            it = menu.addItemWithTitle_action_keyEquivalent_(name, None, "")
-            it.setRepresentedObject_(obj)
-            it.setTarget_(self)
-            it.setAction_(func)
-        def addnote(name):
-            additem(name, None, None)
-
-        any_inprogress = None
-        any_conn = None
-        any_err = None
-        if len(self.servers):
-            for i in self.servers:
-                host = i.host()
-                title = i.title()
-                want = i.wantConnect()
-                connected = i.connected()
-                numnets = len(list(i.nets()))
-                if not host:
-                    additem('Connect Untitled', None, i)
-                elif i.autoNets() == models.NET_MANUAL and not numnets:
-                    additem('Connect %s (no routes)' % host, None, i)
-                elif want:
-                    any_conn = i
-                    additem('Disconnect %s' % title, self.cmd_disconnect, i)
-                else:
-                    additem('Connect %s' % title, self.cmd_connect, i)
-                if not want:
-                    msg = 'Off'
-                elif i.error():
-                    msg = 'ERROR - try reconnecting'
-                    any_err = i
-                elif connected:
-                    msg = 'Connected'
-                else:
-                    msg = 'Connecting...'
-                    any_inprogress = i
-                addnote('   State: %s' % msg)
-        else:
-            addnote('No servers defined yet')
-
-        menu.addItem_(NSMenuItem.separatorItem())
-        additem('Preferences...', self.cmd_show, None)
-        additem('Quit Sshuttle VPN', self.cmd_quit, None)
-
-        if any_err:
-            self.statusitem.setImage_(self.img_err)
-            self.statusitem.setTitle_('Error!')
-        elif any_conn:
-            self.statusitem.setImage_(self.img_running)
-            if any_inprogress:
-                self.statusitem.setTitle_('Connecting...')
-            else:
-                self.statusitem.setTitle_('')
-        else:
-            self.statusitem.setImage_(self.img_idle)
-            self.statusitem.setTitle_('')
-
-    def load_servers(self):
-        l = my.Defaults().arrayForKey_('servers') or []
-        sl = []
-        for s in l:
-            host = s.get('host', None)
-            if not host: continue
-            
-            nets = s.get('nets', [])
-            nl = []
-            for n in nets:
-                subnet = n[0]
-                width = n[1]
-                net = models.SshuttleNet.alloc().init()
-                net.setSubnet_(subnet)
-                net.setWidth_(width)
-                nl.append(net)
-            
-            autoNets = s.get('autoNets', models.NET_AUTO)
-            autoHosts = s.get('autoHosts', True)
-            useDns = s.get('useDns', autoNets == models.NET_ALL)
-            latencyControl = s.get('latencyControl', models.LAT_INTERACTIVE)
-            srv = models.SshuttleServer.alloc().init()
-            srv.setHost_(host)
-            srv.setAutoNets_(autoNets)
-            srv.setAutoHosts_(autoHosts)
-            srv.setNets_(nl)
-            srv.setUseDns_(useDns)
-            srv.setLatencyControl_(latencyControl)
-            sl.append(srv)
-        self.serversController.addObjects_(sl)
-        self.serversController.setSelectionIndex_(0)
-
-    def save_servers(self):
-        l = []
-        for s in self.servers:
-            host = s.host()
-            if not host: continue
-            nets = []
-            for n in s.nets():
-                subnet = n.subnet()
-                if not subnet: continue
-                nets.append((subnet, n.width()))
-            d = dict(host=s.host(),
-                     nets=nets,
-                     autoNets=s.autoNets(),
-                     autoHosts=s.autoHosts(),
-                     useDns=s.useDns(),
-                     latencyControl=s.latencyControl())
-            l.append(d)
-        my.Defaults().setObject_forKey_(l, 'servers')
-        self.fill_menu()
-
-    def awakeFromNib(self):
-        self.routingField.removeAllItems()
-        tf = self.routingField.addItemWithTitle_
-        tf('Send all traffic through this server')
-        tf('Determine automatically')
-        tf('Custom...')
-
-        self.latencyControlField.removeAllItems()
-        tf = self.latencyControlField.addItemWithTitle_
-        tf('Fast transfer')
-        tf('Low latency')
-
-        # Hmm, even when I mark this as !enabled in the .nib, it still comes
-        # through as enabled.  So let's just disable it here (since we don't
-        # support this feature yet).
-        self.startAtLoginField.setEnabled_(False)
-        self.startAtLoginField.setState_(False)
-        self.autoReconnectField.setEnabled_(False)
-        self.autoReconnectField.setState_(False)
-
-        self.load_servers()
-
-        # Initialize our menu item
-        self.menu = NSMenu.alloc().initWithTitle_('Sshuttle')
-        bar = NSStatusBar.systemStatusBar()
-        statusitem = bar.statusItemWithLength_(NSVariableStatusItemLength)
-        self.statusitem = statusitem
-        self.img_idle = my.Image('chicken-tiny-bw', 'png')
-        self.img_running = my.Image('chicken-tiny', 'png')
-        self.img_err = my.Image('chicken-tiny-err', 'png')
-        statusitem.setImage_(self.img_idle)
-        statusitem.setHighlightMode_(True)
-        statusitem.setMenu_(self.menu)
-        self.fill_menu()
-        
-        models.configchange_callback = my.DelayedCallback(self.save_servers)
-        
-        def sc(server):
-            if server.wantConnect():
-                self._connect(server)
-            else:
-                self._disconnect(server)
-        models.setconnect_callback = sc
-
-
-# Note: NSApplicationMain calls sys.exit(), so this never returns.
-NSApplicationMain(sys.argv)

ui-macos/models.py

@@ -1,166 +0,0 @@
-from AppKit import *
-import my
-
-
-configchange_callback = setconnect_callback = None
-
-
-def config_changed():
-    if configchange_callback:
-        configchange_callback()
-
-
-def _validate_ip(v):
-    parts = v.split('.')[:4]
-    if len(parts) < 4:
-        parts += ['0'] * (4 - len(parts))
-    for i in range(4):
-        n = my.atoi(parts[i])
-        if n < 0:
-            n = 0
-        elif n > 255:
-            n = 255
-        parts[i] = str(n)
-    return '.'.join(parts)
-
-
-def _validate_width(v):
-    n = my.atoi(v)
-    if n < 0:
-        n = 0
-    elif n > 32:
-        n = 32
-    return n
-
-
-class SshuttleNet(NSObject):
-    def subnet(self):
-        return getattr(self, '_k_subnet', None)
-    def setSubnet_(self, v):
-        self._k_subnet = v
-        config_changed()
-    @objc.accessor
-    def validateSubnet_error_(self, value, error):
-        #print 'validateSubnet!'
-        return True, _validate_ip(value), error
-
-    def width(self):
-        return getattr(self, '_k_width', 24)
-    def setWidth_(self, v):
-        self._k_width = v
-        config_changed()
-    @objc.accessor
-    def validateWidth_error_(self, value, error):
-        #print 'validateWidth!'
-        return True, _validate_width(value), error
-
-NET_ALL = 0
-NET_AUTO = 1
-NET_MANUAL = 2
-
-LAT_BANDWIDTH = 0
-LAT_INTERACTIVE = 1
-
-class SshuttleServer(NSObject):
-    def init(self):
-        self = super(SshuttleServer, self).init()
-        config_changed()
-        return self
-    
-    def wantConnect(self):
-        return getattr(self, '_k_wantconnect', False)
-    def setWantConnect_(self, v):
-        self._k_wantconnect = v
-        self.setError_(None)
-        config_changed()
-        if setconnect_callback: setconnect_callback(self)
-
-    def connected(self):
-        return getattr(self, '_k_connected', False)
-    def setConnected_(self, v):
-        print 'setConnected of %r to %r' % (self, v)
-        self._k_connected = v
-        if v: self.setError_(None)  # connected ok, so no error
-        config_changed()
-
-    def error(self):
-        return getattr(self, '_k_error', None)
-    def setError_(self, v):
-        self._k_error = v
-        config_changed()
-
-    def isValid(self):
-        if not self.host():
-            return False
-        if self.autoNets() == NET_MANUAL and not len(list(self.nets())):
-            return False
-        return True
-
-    def title(self):
-        host = self.host()
-        if not host:
-            return host
-        an = self.autoNets()
-        suffix = ""
-        if an == NET_ALL:
-            suffix = " (all traffic)"
-        elif an == NET_MANUAL:
-            n = self.nets()
-            suffix = ' (%d subnet%s)' % (len(n), len(n)!=1 and 's' or '')
-        return self.host() + suffix
-    def setTitle_(self, v):
-        # title is always auto-generated
-        config_changed()
-    
-    def host(self):
-        return getattr(self, '_k_host', None)
-    def setHost_(self, v):
-        self._k_host = v
-        self.setTitle_(None)
-        config_changed()
-    @objc.accessor
-    def validateHost_error_(self, value, error):
-        #print 'validatehost! %r %r %r' % (self, value, error)
-        while value.startswith('-'):
-            value = value[1:]
-        return True, value, error
-
-    def nets(self):
-        return getattr(self, '_k_nets', [])
-    def setNets_(self, v):
-        self._k_nets = v
-        self.setTitle_(None)
-        config_changed()
-    def netsHidden(self):
-        #print 'checking netsHidden'
-        return self.autoNets() != NET_MANUAL
-    def setNetsHidden_(self, v):
-        config_changed()
-        #print 'setting netsHidden to %r' % v
-        
-    def autoNets(self):
-        return getattr(self, '_k_autoNets', NET_AUTO)
-    def setAutoNets_(self, v):
-        self._k_autoNets = v
-        self.setNetsHidden_(-1)
-        self.setUseDns_(v == NET_ALL)
-        self.setTitle_(None)
-        config_changed()
-
-    def autoHosts(self):
-        return getattr(self, '_k_autoHosts', True)
-    def setAutoHosts_(self, v):
-        self._k_autoHosts = v
-        config_changed()
-
-    def useDns(self):
-        return getattr(self, '_k_useDns', False)
-    def setUseDns_(self, v):
-        self._k_useDns = v
-        config_changed()
-
-    def latencyControl(self):
-        return getattr(self, '_k_latencyControl', LAT_INTERACTIVE)
-    def setLatencyControl_(self, v):
-        self._k_latencyControl = v
-        config_changed()

ui-macos/my.py

@@ -1,62 +0,0 @@
-import sys, os
-from AppKit import *
-import PyObjCTools.AppHelper
-
-
-def bundle_path(name, typ):
-    if typ:
-        return NSBundle.mainBundle().pathForResource_ofType_(name, typ)
-    else:
-        return os.path.join(NSBundle.mainBundle().resourcePath(), name)
-
-
-# Load an NSData using a python string
-def Data(s):
-    return NSData.alloc().initWithBytes_length_(s, len(s))
-
-
-# Load a property list from a file in the application bundle.
-def PList(name):
-    path = bundle_path(name, 'plist')
-    return NSDictionary.dictionaryWithContentsOfFile_(path)
-
-
-# Load an NSImage from a file in the application bundle.
-def Image(name, ext):
-    bytes = open(bundle_path(name, ext)).read()
-    img = NSImage.alloc().initWithData_(Data(bytes))
-    return img
-
-
-# Return the NSUserDefaults shared object.
-def Defaults():
-    return NSUserDefaults.standardUserDefaults()
-
-
-# Usage:
-#   f = DelayedCallback(func, args...)
-# later:
-#   f()
-#
-# When you call f(), it will schedule a call to func() next time the
-# ObjC event loop iterates.  Multiple calls to f() in a single iteration
-# will only result in one call to func().
-#
-def DelayedCallback(func, *args, **kwargs):
-    flag = [0]
-    def _go():
-        if flag[0]:
-            print 'running %r (flag=%r)' % (func, flag)
-            flag[0] = 0
-            func(*args, **kwargs)
-    def call():
-        flag[0] += 1
-        PyObjCTools.AppHelper.callAfter(_go)
-    return call
-
-
-def atoi(s):
-    try:
-        return int(s)
-    except ValueError:
-        return 0

ui-macos/run.do

@@ -1,4 +0,0 @@
-redo-ifchange debug.app
-exec >&2
-./debug.app/Contents/MacOS/Sshuttle
-

ui-macos/sources.list.do

@@ -1,14 +0,0 @@
-redo-always
-exec >$3
-cat <<-EOF
-	app.icns
-	MainMenu.nib English.lproj/MainMenu.nib
-	UserDefaults.plist
-	chicken-tiny.png
-	chicken-tiny-bw.png
-	chicken-tiny-err.png
-EOF
-for d in *.py sshuttle/*.py sshuttle/sshuttle sshuttle/compat/*.py; do
-	echo $d
-done
-redo-stamp <$3

ui-macos/sshuttle

@@ -1 +0,0 @@
-..