websocket.py: generic code from wsproxy and wstest.
This commit is contained in:
Joel Martin
+22
-111
@@ -9,24 +9,11 @@ as taken from http://docs.python.org/dev/library/ssl.html#certificates
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'''
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import sys, os, socket, ssl, time, traceback, re
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from base64 import b64encode, b64decode
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import sys, socket, ssl
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from select import select
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from websocket import *
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buffer_size = 65536
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send_seq = 0
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client_settings = {}
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server_handshake = """HTTP/1.1 101 Web Socket Protocol Handshake\r
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Upgrade: WebSocket\r
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Connection: Upgrade\r
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WebSocket-Origin: %s\r
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WebSocket-Location: %s://%s%s\r
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WebSocket-Protocol: sample\r
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\r
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"""
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policy_response = """<cross-domain-policy><allow-access-from domain="*" to-ports="*" /></cross-domain-policy>\n"""
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traffic_legend = """
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Traffic Legend:
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@@ -40,22 +27,8 @@ Traffic Legend:
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<. - Client send partial
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"""
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def traffic(token="."):
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sys.stdout.write(token)
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sys.stdout.flush()
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def decode(buf):
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""" Parse out WebSocket packets. """
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if buf.count('\xff') > 1:
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traffic(str(buf.count('\xff')))
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return [b64decode(d[1:]) for d in buf.split('\xff')]
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else:
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return [b64decode(buf[1:-1])]
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def proxy(client, target):
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def do_proxy(client, target):
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""" Proxy WebSocket to normal socket. """
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global send_seq
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cqueue = []
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cpartial = ""
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tqueue = []
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@@ -66,15 +39,14 @@ def proxy(client, target):
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if excepts: raise Exception("Socket exception")
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if tqueue and target in outs:
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#print "Target send: %s" % repr(tqueue[0])
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##log.write("Target send: %s\n" % map(ord, tqueue[0]))
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dat = tqueue.pop(0)
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sent = target.send(dat)
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if sent == len(dat):
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traffic(">")
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else:
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tqueue.insert(0, dat[sent:])
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traffic(">.")
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traffic(".>")
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##log.write("Target send: %s\n" % map(ord, dat))
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if cqueue and client in outs:
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dat = cqueue.pop(0)
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@@ -92,24 +64,17 @@ def proxy(client, target):
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buf = target.recv(buffer_size)
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if len(buf) == 0: raise Exception("Target closed")
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##log.write("Target recv (%d): %s\n" % (len(buf), map(ord, buf)))
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if client_settings.get("b64encode"):
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buf = b64encode(buf)
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if client_settings.get("seq_num"):
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cqueue.append("\x00%d:%s\xff" % (send_seq, buf))
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send_seq += 1
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else:
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cqueue.append("\x00%s\xff" % buf)
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cqueue.append(encode(buf))
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traffic("{")
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##log.write("Target recv (%d): %s\n" % (len(buf), map(ord, buf)))
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if client in ins:
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buf = client.recv(buffer_size)
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if len(buf) == 0: raise Exception("Client closed")
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if buf[-1] == "\xff":
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if buf[-1] == '\xff':
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if buf.count('\xff') > 1:
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traffic(str(buf.count('\xff')))
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traffic("}")
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##log.write("Client recv (%d): %s\n" % (len(buf), repr(buf)))
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if cpartial:
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@@ -118,78 +83,24 @@ def proxy(client, target):
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else:
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tqueue.extend(decode(buf))
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else:
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traffic("}.")
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traffic(".}")
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##log.write("Client recv partial (%d): %s\n" % (len(buf), repr(buf)))
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cpartial = cpartial + buf
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def proxy_handler(client):
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global target_host, target_port
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def do_handshake(sock):
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global client_settings
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# Peek, but don't read the data
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handshake = sock.recv(1024, socket.MSG_PEEK)
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#print "Handshake [%s]" % repr(handshake)
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if handshake.startswith("<policy-file-request/>"):
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handshake = sock.recv(1024)
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print "Sending flash policy response"
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sock.send(policy_response)
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sock.close()
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return False
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elif handshake.startswith("\x16"):
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retsock = ssl.wrap_socket(
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sock,
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server_side=True,
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certfile='self.pem',
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ssl_version=ssl.PROTOCOL_TLSv1)
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scheme = "wss"
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print "Using SSL/TLS"
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else:
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retsock = sock
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scheme = "ws"
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print "Using plain (not SSL) socket"
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handshake = retsock.recv(4096)
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req_lines = handshake.split("\r\n")
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_, path, _ = req_lines[0].split(" ")
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_, origin = req_lines[4].split(" ")
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_, host = req_lines[3].split(" ")
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print "Connecting to: %s:%s" % (target_host, target_port)
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tsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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tsock.connect((target_host, target_port))
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# Parse settings from the path
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cvars = path.partition('?')[2].partition('#')[0].split('&')
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for cvar in [c for c in cvars if c]:
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name, _, value = cvar.partition('=')
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client_settings[name] = value and value or True
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print "client_settings:", client_settings
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retsock.send(server_handshake % (origin, scheme, host, path))
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return retsock
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def start_server(listen_port, target_host, target_port):
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global send_seq
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lsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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lsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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lsock.bind(('', listen_port))
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lsock.listen(100)
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print traffic_legend
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while True:
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try:
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csock = tsock = None
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print 'waiting for connection on port %s' % listen_port
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startsock, address = lsock.accept()
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print 'Got client connection from %s' % address[0]
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csock = do_handshake(startsock)
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if not csock: continue
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print "Connecting to: %s:%s" % (target_host, target_port)
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tsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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tsock.connect((target_host, target_port))
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send_seq = 0
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proxy(csock, tsock)
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except Exception:
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print "Ignoring exception:"
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print traceback.format_exc()
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if csock: csock.close()
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if tsock: tsock.close()
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try:
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do_proxy(client, tsock)
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except:
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if tsock: tsock.close()
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raise
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if __name__ == '__main__':
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##log = open("ws.log", 'w')
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@@ -201,4 +112,4 @@ if __name__ == '__main__':
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except:
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print "Usage: <listen_port> <target_host> <target_port>"
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sys.exit(1)
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start_server(listen_port, target_host, target_port)
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start_server(listen_port, proxy_handler)
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