Fix argument splitting for multi-word arguments

By just splitting at spaces, multi-word arguments are torn apart even if
quoted. In case of custom ssh-cmd, this makes it practically impossible
to set certian options through `ssh -o`.
shlex splits arguments like a shell and e.g. respects quotes.

sshuttle/methods/pf.py

@@ -4,6 +4,7 @@
 import socket
 import struct
 import subprocess as ssubprocess
+import shlex
 from fcntl import ioctl
 from ctypes import c_char, c_uint8, c_uint16, c_uint32, Union, Structure, \
     sizeof, addressof, memmove
@@ -342,7 +343,7 @@ def _get_natlook_port(self, xport):
 
 
 def pfctl(args, stdin=None):
-    argv = ['pfctl'] + list(args.split(" "))
+    argv = ['pfctl'] + shlex.split(args)
     debug1('>> %s\n' % ' '.join(argv))
 
     env = {

sshuttle/ssh.py

@@ -5,6 +5,7 @@
 import zlib
 import imp
 import subprocess as ssubprocess
+import shlex
 import sshuttle.helpers as helpers
 from sshuttle.helpers import debug2
 
@@ -109,7 +110,7 @@ def connect(ssh_cmd, rhostport, python, stderr, options):
         argv = [sys.executable, '-c', pyscript]
     else:
         if ssh_cmd:
-            sshl = ssh_cmd.split(' ')
+            sshl = shlex.split(ssh_cmd)
         else:
             sshl = ['ssh']
         if python: