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POPython TCP & UDP proxy/relay
 

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    <p>OS: CentOS<br> Python: 2.4 and 2.7</p> <p>I'm trying to build a relay or proxy for both TCP and UDP traffic for my applications.<br> My setup is app1 verifies app2 is online by constantly sending UDP packets.<br> Once app1 verifies that app2 is online, it will then send app2 data packets via TCP protocol.</p> <p>This is my code so far:</p> <pre><code>#------------------------------------- #SOCK_DGRAM --UDP u_localPort = 20006 u_remotePort = 20006 u_remoteHost = "x.x.x.x" u_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) u_sock.bind(('', u_localPort)) u_knownClient = None u_knownServer = (u_remoteHost, u_remotePort) #------------------------------------- #------------------------------------- #SOCK_STREAM --TCP t_localPort = 10006 t_remotePort = 10006 t_remoteHost = "x.x.x.x" #client c_tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM) c_tcp.connect((t_remoteHost, t_remotePort)) #server s_tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s_tcp.bind(('', u_localPort)) s_tcp.listen(1) conn, addr = s_tcp.accept() #------------------------------------- while True: u_data, u_addr = u_sock.recvfrom(4096) if u_knownClient is None: u_knownClient = u_addr if u_addr == u_knownClient: u_sock.sendto(u_data, u_knownServer) else: u_sock.sendto(u_data, u_knownClient) data = conn.recv(1024) if not data: break print "received data:", data c_tcp.send(data) # echo </code></pre> <p>With this code the UDP data seems to be relaying properly. But the TCP isn't. What could be wrong?</p>
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    1. COWhy probe with UDP before sending via TCP? Why not just use TCP from the beginning, and assume no connection means not available?
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