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#!/usr/bin/python
#
# tcprelay.py - TCP connection relay for usbmuxd
#
# Copyright (C) 2009 Hector Martin "marcan" <hector@marcansoft.com>
#
# 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 or version 3.
#
# 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 General Public License for more details.
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import usbmux
import SocketServer
import select
from optparse import OptionParser
import sys
import threading
class SocketRelay(object):
def __init__(self, a, b, maxbuf=65535):
self.a = a
self.b = b
self.atob = ""
self.btoa = ""
self.maxbuf = maxbuf
def handle(self):
while True:
rlist = []
wlist = []
xlist = [self.a, self.b]
if self.atob:
wlist.append(self.b)
if self.btoa:
wlist.append(self.a)
if len(self.atob) < self.maxbuf:
rlist.append(self.a)
if len(self.btoa) < self.maxbuf:
rlist.append(self.b)
rlo, wlo, xlo = select.select(rlist, wlist, xlist)
if xlo:
return
if self.a in wlo:
n = self.a.send(self.btoa)
self.btoa = self.btoa[n:]
if self.b in wlo:
n = self.b.send(self.atob)
self.atob = self.atob[n:]
if self.a in rlo:
s = self.a.recv(self.maxbuf - len(self.atob))
if not s:
return
self.atob += s
if self.b in rlo:
s = self.b.recv(self.maxbuf - len(self.btoa))
if not s:
return
self.btoa += s
#print "Relay iter: %8d atob, %8d btoa, lists: %r %r %r"%(len(self.atob), len(self.btoa), rlo, wlo, xlo)
class TCPRelay(SocketServer.BaseRequestHandler):
def handle(self):
print "Incoming connection to %d"%self.server.server_address[1]
mux = usbmux.USBMux("/tmp/usbmuxd")
print "Waiting for devices..."
if not mux.devices:
mux.process(1.0)
if not mux.devices:
print "No device found"
self.request.close()
return
dev = mux.devices[0]
print "Connecting to device %s"%str(dev)
dsock = mux.connect(dev, self.server.rport)
lsock = self.request
print "Connection established, relaying data"
try:
fwd = SocketRelay(dsock, lsock, self.server.bufsize * 1024)
fwd.handle()
finally:
dsock.close()
lsock.close()
print "Connection closed"
class TCPServer(SocketServer.TCPServer):
allow_reuse_address = True
class ThreadedTCPServer(SocketServer.ThreadingMixIn, TCPServer):
pass
HOST = "localhost"
parser = OptionParser(usage="usage: %prog [OPTIONS] RemotePort[:LocalPort] [RemotePort[:LocalPort]]...")
parser.add_option("-t", "--threaded", dest='threaded', action='store_true', default=False, help="use threading to handle multiple connections at once")
parser.add_option("-b", "--bufsize", dest='bufsize', action='store', metavar='KILOBYTES', type='int', default=128, help="specify buffer size for socket forwarding")
options, args = parser.parse_args()
serverclass = TCPServer
if options.threaded:
serverclass = ThreadedTCPServer
if len(args) == 0:
parser.print_help()
sys.exit(1)
ports = []
for arg in args:
try:
if ':' in arg:
rport, lport = arg.split(":")
rport = int(rport)
lport = int(lport)
ports.append((rport, lport))
else:
ports.append((int(arg), int(arg)))
except:
parser.print_help()
sys.exit(1)
servers=[]
for rport, lport in ports:
print "Forwarding local port %d to remote port %d"%(lport, rport)
server = serverclass((HOST, lport), TCPRelay)
server.rport = rport
server.bufsize = options.bufsize
servers.append(server)
alive = True
while alive:
try:
rl, wl, xl = select.select(servers, [], [])
for server in rl:
server.handle_request()
except:
alive = False
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