Really basic transproxying on localhost.

When regenerating outgoing connections, we set TTL=42 to prevent re-proxying
of requests.  That's a little hacky, but at least it avoids infinite loops.

main.py

@@ -1,2 +1,29 @@
 #!/usr/bin/env python
-import ssh, options
+import sys
+import options, client
+
+optspec = """
+sshuttle [-l [ip:]port] [-r [username@]sshserver] <subnets...>
+--
+l,listen=  transproxy to this ip address and port number [default=0]
+r,remote=  ssh hostname (and optional username) of remote sshuttle server
+server     [internal use only]
+iptables   [internal use only]
+"""
+o = options.Options('sshuttle', optspec)
+(opt, flags, extra) = o.parse(sys.argv[1:])
+
+if opt.server:
+    o.fatal('server mode not implemented yet')
+    sys.exit(1)
+elif opt.iptables:
+    o.fatal('iptables mode not implemented yet')
+    sys.exit(1)
+else:
+    if len(extra) < 1:
+        o.fatal('at least one argument expected')
+    remotename = extra[0]
+    if remotename == '' or remotename == '-':
+        remotename = None
+    subnets = extra[1:]
+    sys.exit(client.main(remotename, subnets))