Restructure code

* Make compatible with setuptools.
* Load modules via ssh into separate modules, not the one name space.

MANIFEST.in

@@ -0,0 +1,5 @@
+include *.txt
+include *.rst
+include *.py
+include MANIFEST.in
+recursive-include sshuttle *.py

README.rst

@@ -1,28 +1,3 @@
-
-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.
-
-Required Software
-=================
-
- - You need PyXAPI, available here:
-   http://www.pps.univ-paris-diderot.fr/~ylg/PyXAPI/
- - Python 2.x, both locally and the remote system
-
-
-Additional Suggested Software
------------------------------
-
- - You may want to need autossh, available in various package management
-   systems
-
-
 sshuttle: where transparent proxy meets VPN meets ssh
 =====================================================
 
@@ -70,38 +45,57 @@ Prerequisites
    available. (The server doesn't need to be MacOS or BSD.)
 
 
+ - Python 2.x, both locally and the remote system. Python 3.x is not yet supported.
+
+*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.
+
+
+Additional Suggested Software
+-----------------------------
+
+ - You may want to need autossh, available in various package management
+   systems
+
+ - For Linux only tproxy support, you need PyXAPI, available here:
+   http://www.pps.univ-paris-diderot.fr/~ylg/PyXAPI/
+
+
 Obtaining sshuttle
 ------------------
 
- - First, go get PyXAPI from the link above
+ - Clone::
 
- - Clone: `git clone https://github.com/sshuttle/sshuttle.git`
+       git clone https://github.com/sshuttle/sshuttle.git
+       ./setup.py install
+
+ - From PyPI::
+
+       pip install sshuttle
 
 
-Usage on (Ubuntu) Linux
+Usage
------------------------
+-----
 
- - `cd packaging; ./make_deb`
+ - Forward all traffic::
 
- - `sudo dpkg -i ./sshuttle-VERSION.deb`
+       sshuttle -r username@sshserver 0.0.0.0/0 -vv
-
- - Check out the files in `/etc/sshuttle`; configure them so your tunnel works
-
- - `sudo service sshuttle start`
-
-
-Usage on other Linuxes and OSes
--------------------------------
-
-  <tt>src/sshuttle -r username@sshserver 0.0.0.0/0 -vv</tt>
 
  - There is a shortcut for 0.0.0.0/0 for those that value
-   their wrists
+   their wrists::
-   <tt>src/sshuttle -r username@sshserver 0/0 -vv</tt>
+
+       sshuttle -r username@sshserver 0/0 -vv
 
  - If you would also like your DNS queries to be proxied
-   through the DNS server of the server you are connect to:
+   through the DNS server of the server you are connect to::
-   <tt>src/sshuttle --dns -vvr username@sshserver 0/0</tt>
+
+       sshuttle --dns -vvr username@sshserver 0/0
 
    The above is probably what you want to use to prevent
    local network attacks such as Firesheep and friends.
@@ -112,6 +106,7 @@ 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
 -----------
 
@@ -127,7 +122,7 @@ 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
+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
@@ -139,6 +134,19 @@ Fun, right?  A poor man's instant VPN, and you don't even have to have
 admin access on the server.
 
 
+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
+
+
 Theory of Operation
 -------------------
 
@@ -155,8 +163,7 @@ 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
+You could compare sshuttle to something like the old `Slirp <http://en.wikipedia.org/wiki/Slirp>`_ program, which was 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
@@ -164,9 +171,9 @@ 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
+*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 <i>never</i>
+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
@@ -181,8 +188,7 @@ safe.
 Useless Trivia
 --------------
 
-Back in 1998 (12 years ago!  Yikes!), I released the first version of <a
+Back in 1998 (12 years ago!  Yikes!), I released the first version of `Tunnel Vision <http://alumnit.ca/wiki/?TunnelVisionReadMe>`_, 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
@@ -197,8 +203,7 @@ 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
+would eventually become `Slipstream Internet Acceleration <http://www.slipstream.com/>`_.  He asked me to do a contract for him to build an
-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
@@ -215,7 +220,3 @@ 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

VERSION.txt

@@ -0,0 +1 @@
+0.72

run

@@ -0,0 +1,6 @@
+#!/bin/sh
+if python2 -V 2>/dev/null; then
+	exec python2 -m "sshuttle" "$@"
+else
+	exec python -m "sshuttle" "$@"
+fi

setup.py

@@ -0,0 +1,51 @@
+#!/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
+
+with open('VERSION.txt', 'r') as f:
+    version = f.readline().strip()
+
+setup(
+    name="sshuttle",
+    version=version,
+    url='https://github.com/sshuttle/sshuttle',
+    author='Brian May',
+    author_email='brian@linuxpenguins.xyz',
+    description='Transparent proxy server that works as a poor man\'s VPN.',
+    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",
+        "Topic :: System :: Networking",
+    ],
+    entry_points={
+        'console_scripts': [
+            'sshuttle = sshuttle.__main__',
+        ],
+    },
+    keywords="ssh vpn",
+)

src/Makefile

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

src/do

@@ -1,175 +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}
-}
-
-dirname()
-(
-	_dirsplit "$1"
-	dir=${dir%/}
-	echo "${dir:-.}"
-)
-
-_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()
-{
-	local prefix=
-	while :; do
-		_find_dofile_pwd "$1"
-		[ -e "$dofile" ] && break
-		[ "$PWD" = "/" ] && break
-		target=${PWD##*/}/$target
-		tmp=${PWD##*/}/$tmp
-		prefix=${PWD##*/}/$prefix
-		cd ..
-	done
-	base=$prefix$base
-}
-
-
-_run_dofile()
-{
-	export DO_DEPTH="$DO_DEPTH  "
-	export REDO_TARGET=$PWD/$target
-	local line1
-	set -e
-	read line1 <"$PWD/$dofile"
-	cmd=${line1#"#!/"}
-	if [ "$cmd" != "$line1" ]; then
-		/$cmd "$PWD/$dofile" "$@" >"$tmp.tmp2"
-	else
-		:; . "$PWD/$dofile" >"$tmp.tmp2"
-	fi
-}
-
-
-_do()
-{
-	local dir=$1 target=$2 tmp=$3
-	if [ ! -e "$target" ] || [ -d "$target" -a ! -e "$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_BUILT" ] || [ ! -d "$(dirname "$target")" ] ||
-		: >>"$target.did"
-		( _run_dofile "$target" "$base" "$tmp.tmp" )
-		rv=$?
-		if [ $rv != 0 ]; then
-			printf "do: %s%s\n" "$DO_DEPTH" \
-				"$dir$target: got exit code $rv" >&2
-			rm -f "$tmp.tmp" "$tmp.tmp2"
-			return $rv
-		fi
-		mv "$tmp.tmp" "$target" 2>/dev/null ||
-		! test -s "$tmp.tmp2" ||
-		mv "$tmp.tmp2" "$target" 2>/dev/null
-		rm -f "$tmp.tmp2"
-	else
-		echo "do  $DO_DEPTH$target exists." >&2
-	fi
-}
-
-
-# Make corrections for directories that don't actually exist yet.
-_dir_shovel()
-{
-	local dir base
-	xdir=$1 xbase=$2 xbasetmp=$2
-	while [ ! -d "$xdir" -a -n "$xdir" ]; do
-		_dirsplit "${xdir%/}"
-		xbasetmp=${base}__$xbase
-		xdir=$dir xbase=$base/$xbase
-		echo "xbasetmp='$xbasetmp'" >&2
-	done
-}
-
-
-redo()
-{
-	for i in "$@"; do
-		_dirsplit "$i"
-		_dir_shovel "$dir" "$base"
-		dir=$xdir base=$xbase basetmp=$xbasetmp
-		( cd "$dir" && _do "$dir" "$base" "$basetmp" ) || return 1
-	done
-}
-
-
-set -e
-redo "$@"
-
-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

src/sshuttle

@@ -1,12 +0,0 @@
-#!/bin/sh
-EXE=$0
-for i in 1 2 3 4 5 6 7 8 9 10; do
-	[ -L "$EXE" ] || break
-	EXE=$(readlink "$EXE")
-done
-DIR=$(dirname "$EXE")
-if python2 -V 2>/dev/null; then
-	exec python2 "$DIR/main.py" python2 "$@"
-else
-	exec python "$DIR/main.py" python "$@"
-fi

sshuttle/__main__.py

@@ -3,11 +3,11 @@ import re
 import socket
 import helpers
 import options
-import client
+import sshuttle.client as client
-import server
+import sshuttle.server as server
-import firewall
+import sshuttle.firewall as firewall
-import hostwatch
+import sshuttle.hostwatch as hostwatch
-from helpers import family_ip_tuple, log, Fatal
+from sshuttle.helpers import family_ip_tuple, log, Fatal
 
 
 # 1.2.3.4/5 or just 1.2.3.4
@@ -139,7 +139,7 @@ firewall   (internal use only)
 hostwatch  (internal use only)
 """
 o = options.Options(optspec)
-(opt, flags, extra) = o.parse(sys.argv[2:])
+(opt, flags, extra) = o.parse(sys.argv[1:])
 
 if opt.daemon:
     opt.syslog = 1

sshuttle/assembler.py

@@ -1,8 +1,8 @@
 import sys
 import zlib
+import imp
 
 z = zlib.decompressobj()
-mainmod = sys.modules[__name__]
 while 1:
     name = sys.stdin.readline().strip()
     if name:
@@ -11,17 +11,23 @@ while 1:
             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,
+        module = imp.new_module(name)
-        # then makes each of the module names point at this one. Gross.
+        parent, _, parent_name = name.rpartition(".")
-        assert(name.endswith('.py'))
+        if parent != "":
-        modname = name[:-3]
+            setattr(sys.modules[parent], parent_name, module)
-        mainmod.__dict__[modname] = mainmod
+
+        code = compile(content, name, "exec")
+        exec code in module.__dict__
+        sys.modules[name] = module
     else:
         break
 
-verbose = verbosity
 sys.stderr.flush()
 sys.stdout.flush()
+
+import sshuttle.helpers
+sshuttle.helpers.verbose = verbosity
+
+from sshuttle.server import main
 main()

sshuttle/client.py

@@ -3,15 +3,15 @@ import errno
 import re
 import signal
 import time
-import compat.ssubprocess as ssubprocess
+import sshuttle.compat.ssubprocess as ssubprocess
 import helpers
 import os
-import ssnet
+import sshuttle.ssnet as ssnet
-import ssh
+import sshuttle.ssh as ssh
 import ssyslog
 import sys
-from ssnet import SockWrapper, Handler, Proxy, Mux, MuxWrapper
+from sshuttle.ssnet import SockWrapper, Handler, Proxy, Mux, MuxWrapper
-from helpers import log, debug1, debug2, debug3, Fatal, islocal, \
+from sshuttle.helpers import log, debug1, debug2, debug3, Fatal, islocal, \
         resolvconf_nameservers
 
 recvmsg = None
@@ -282,7 +282,9 @@ class FirewallClient:
         self.auto_nets = []
         self.subnets_include = subnets_include
         self.subnets_exclude = subnets_exclude
-        argvbase = ([sys.argv[1], sys.argv[0], sys.argv[1]] +
+        python_path = os.path.dirname(os.path.dirname(__file__))
+        argvbase = (["PYTHONPATH=%s" % python_path] +
+                    [sys.executable, sys.argv[0]] +
                     ['-v'] * (helpers.verbose or 0) +
                     ['--firewall', str(port_v6), str(port_v4),
                      str(dnsport_v6), str(dnsport_v4),

sshuttle/firewall.py

@@ -8,7 +8,7 @@ import ssyslog
 import sys
 import os
 import re
-from helpers import log, debug1, debug3, islocal, Fatal, family_to_string, \
+from sshuttle.helpers import log, debug1, debug3, islocal, Fatal, family_to_string, \
     resolvconf_nameservers
 from fcntl import ioctl
 from ctypes import c_char, c_uint8, c_uint16, c_uint32, Union, Structure, \

sshuttle/hostwatch.py

@@ -5,10 +5,10 @@ import select
 import errno
 import os
 import sys
-if not globals().get('skip_imports'):
+
-    import compat.ssubprocess as ssubprocess
+import sshuttle.compat.ssubprocess as ssubprocess
-    import helpers
+import sshuttle.helpers as helpers
-    from helpers import log, debug1, debug2, debug3
+from sshuttle.helpers import log, debug1, debug2, debug3
 
 POLL_TIME = 60 * 15
 NETSTAT_POLL_TIME = 30

sshuttle/server.py

@@ -5,14 +5,14 @@ import traceback
 import time
 import sys
 import os
-if not globals().get('skip_imports'):
+
-    import ssnet
+import sshuttle.ssnet as ssnet
-    import helpers
+import sshuttle.helpers as helpers
-    import hostwatch
+import sshuttle.hostwatch as hostwatch
-    import compat.ssubprocess as ssubprocess
+import sshuttle.compat.ssubprocess as ssubprocess
-    from ssnet import Handler, Proxy, Mux, MuxWrapper
+from sshuttle.ssnet import Handler, Proxy, Mux, MuxWrapper
-    from helpers import log, debug1, debug2, debug3, Fatal, \
+from sshuttle.helpers import log, debug1, debug2, debug3, Fatal, \
-        resolvconf_random_nameserver
+    resolvconf_random_nameserver
 
 
 if not globals().get('latency_control'):

sshuttle/ssh.py

@@ -3,28 +3,51 @@ import os
 import re
 import socket
 import zlib
-import compat.ssubprocess as ssubprocess
+import imp
-import helpers
+import sshuttle.compat.ssubprocess as ssubprocess
-from helpers import debug2
+import sshuttle.helpers as helpers
+from sshuttle.helpers import debug2
 
 
 def readfile(name):
-    basedir = os.path.dirname(os.path.abspath(sys.argv[0]))
+    tokens = name.split(".")
-    path = [basedir] + sys.path
+    f = None
-    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))
 
+    token = tokens[0]
+    token_name = [token]
+    token_str = ".".join(token_name)
 
-def empackage(z, filename, data=None):
+    try:
-    (path, basename) = os.path.split(filename)
+        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
+
+def empackage(z, name, data=None):
     if not data:
-        data = readfile(filename)
+        data = readfile(name)
     content = z.compress(data)
     content += z.flush(zlib.Z_SYNC_FLUSH)
-    return '%s\n%d\n%s' % (basename, len(content), content)
+    return '%s\n%d\n%s' % (name, len(content), content)
 
 
 def connect(ssh_cmd, rhostport, python, stderr, options):
@@ -52,19 +75,20 @@ def connect(ssh_cmd, rhostport, python, stderr, options):
         rhost = None
 
     z = zlib.compressobj(1)
-    content = readfile('assembler.py')
+    content = readfile('sshuttle.assembler')
     optdata = ''.join("%s=%r\n" % (k, v) for (k, v) in options.items())
-    content2 = (empackage(z, 'cmdline_options.py', optdata) +
+    content2 = (empackage(z, 'sshuttle') +
-                empackage(z, 'helpers.py') +
+                empackage(z, 'sshuttle.cmdline_options', optdata) +
-                empackage(z, 'compat/ssubprocess.py') +
+                empackage(z, 'sshuttle.helpers') +
-                empackage(z, 'ssnet.py') +
+                empackage(z, 'sshuttle.compat') +
-                empackage(z, 'hostwatch.py') +
+                empackage(z, 'sshuttle.compat.ssubprocess') +
-                empackage(z, 'server.py') +
+                empackage(z, 'sshuttle.ssnet') +
+                empackage(z, 'sshuttle.hostwatch') +
+                empackage(z, 'sshuttle.server') +
                 "\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))

sshuttle/ssnet.py

@@ -3,8 +3,7 @@ import socket
 import errno
 import select
 import os
-if not globals().get('skip_imports'):
+from sshuttle.helpers import log, debug1, debug2, debug3, Fatal
-    from helpers import log, debug1, debug2, debug3, Fatal
 
 MAX_CHANNEL = 65535