openstack/deb-novnc
Code Issues Proposed changes

Some wsproxy simplifications.

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This commit is contained in:
Joel Martin 2010-03-31 19:37:49 -05:00
parent 3292c4a995
commit ce0e28c7d9
1 changed files with 57 additions and 61 deletions
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118
wsproxy.py
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@ -1,6 +1,6 @@
#!/usr/bin/python
import sys, os, socket, time
import sys, os, socket, time, traceback
from select import select
server_handshake = """HTTP/1.1 101 Web Socket Protocol Handshake\r
@ -12,73 +12,69 @@ WebSocket-Protocol: sample\r
\r
"""
cqueue = []
tqueue = []
def start_proxy(listen_port, target_host, target_port):
lsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
lsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
lsock.bind(('', listen_port))
lsock.listen(100)
while True:
try:
print 'listening on port %s' % listen_port
csock, address = lsock.accept()
print 'Got client connection'
handshake(csock)
print "Handshake complete"
print "Connecting to: %s:%s" % (target_host, target_port)
tsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
tsock.connect((target_host, target_port))
socks = [csock, tsock]
while True:
ins, outs, excepts = select(socks, socks, socks, 1)
if excepts: raise Exception("Socket exception")
if csock in ins:
buf = csock.recv(1024)
if len(buf) == 0:
csock.close()
tsock.close()
raise Exception("Client closed")
tqueue.append(buf[1:-1])
print "Client recv: %s (%d)" % (buf[1:-1], len(buf))
if tsock in ins:
buf = tsock.recv(1024)
if len(buf) == 0:
csock.close()
tsock.close()
raise Exception("Target closed")
cqueue.append(buf)
print "Target recv: %s (%d)" % (buf[1:-1], len(buf))
if cqueue and csock in outs:
while cqueue:
print "Client send: %s" % "\x00" + cqueue[0] + "\xff"
csock.send("\x00" + cqueue.pop(0) + "\xff")
if tqueue and tsock in outs:
while tqueue:
print "Target send: %s" % tqueue[0]
tsock.send(tqueue.pop(0))
except Exception, e:
csock = tsock = None
print "Ignoring exception:", e
def handshake(client):
handshake = client.recv(255)
req_lines = handshake.split("\r\n")
_, path, _ = req_lines[0].split(" ")
_, origin = req_lines[4].split(" ")
_, host = req_lines[3].split(" ")
#print "*** got handshake:\n%s" % handshake
print "*** client origin: %s, location: ws://%s%s" % (origin, host, path)
client.send(server_handshake % (origin, host, path))
def proxy(client, target):
cqueue = []
tqueue = []
socks = [client, target]
while True:
ins, outs, excepts = select(socks, socks, socks, 1)
if excepts: raise Exception("Socket exception")
if client in ins:
buf = client.recv(1024)
if len(buf) == 0: raise Exception("Client closed")
tqueue.append(buf[1:-1])
print "Client recv: %s (%d)" % (buf[1:-1], len(buf))
if target in ins:
buf = target.recv(1024)
if len(buf) == 0: raise Exception("Target closed")
cqueue.append("\x00" + buf + "\xff")
print "Target recv: %s (%d)" % (buf, len(buf))
if cqueue and client in outs:
while cqueue:
print "Client send: %s" % cqueue[0]
client.send(cqueue.pop(0))
if tqueue and target in outs:
while tqueue:
print "Target send: %s" % tqueue[0]
target.send(tqueue.pop(0))
def start_server(listen_port, target_host, target_port):
lsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
lsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
lsock.bind(('', listen_port))
lsock.listen(100)
while True:
try:
csock = tsock = None
print 'listening on port %s' % listen_port
csock, address = lsock.accept()
print 'Got client connection from %s' % address[0]
handshake(csock)
print "Connecting to: %s:%s" % (target_host, target_port)
tsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
tsock.connect((target_host, target_port))
proxy(csock, tsock)
except Exception:
print "Ignoring exception:"
print traceback.format_exc()
if csock: csock.close()
if tsock: tsock.close()
if __name__ == '__main__':
try:
if len(sys.argv) != 4: raise
@ -88,4 +84,4 @@ if __name__ == '__main__':
except:
print "Usage: <listen_port> <target_host> <target_port>"
sys.exit(1)
start_proxy(listen_port, target_host, target_port)
start_server(listen_port, target_host, target_port)