[ENet-discuss] UDP proxy question

[Brad Monahan]

Hi. I'm trying to create a UDP Proxy program but I'm having troubles 
understanding some things about UDP. I know this mailing list is for enet, 
but I figured someone here has to be able to help me with this, and it's the 
only place I could think of to turn for help (after searching for hours and 
hours) since enet uses UDP. Here's the situation. There is a game server 
that sends out client updates to all it's clients on a constant port of 
4949. I have no access to the server, and am not able to alter anything with 
it. The client creates the UDP socket for the updates and binds the socket 
to it's local address on port 0 (allowing a free port to be chosen) and 
recieves the updates from the server. I also have no access to the client 
code, and am not able to alter anything with it. What I'm trying todo is 
create a simple proxy server the client and server will send packets through 
so the proxy can record data coming from the server in an attempt to make a 
program to playback the recorded game later. Right now for the proxy I have 
one socket setup for UDP that binds to it's local address on port 4949 and 
recieves the packets from the server and attempts to send them to the client 
(which is on the same computer/address). This is where the problem comes in. 
I don't know which port the client has binded to because the application 
picks it and it's new every time it starts, so I can't "forward" the packet 
to the client from the proxy because I don't know the client's port. I don't 
understand how the game server knows this port either. I know this is 
definently possible, I just don't have alot of experience with datagram 
sockets. If anyone that understands what I'm trying todo please shed some 
light on the answer! :)

  -Brad

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