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UDP Hole Punching (C ++ / winsock)

Stackoverflow users!

I have an application that needs to deal with p2p, and this is how I get to UDP Hole punching. But I ran into implementation issues. Hope you can give me some advice.

I have a server that works fine and injects clients into eachother, but the clients cannot connect, probably due to my little experience with sockets. So, the client algorithm:

  • Create an udp socket (socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP) )
  • Send a message to the server through the sendto function
  • Use the recvfrom function to lock to get a response from the server

After these three steps, I get the endpoint with peers. Then I tried to connect clients in two ways:

Way1

  • Use the same socket to send peer-to-peer data through the sendto function , but passing another sockaddr
  • Listen with the recvfrom locker function (and at that moment I get the message WSAECONNRESET )

Way2

  • Create new socket
  • Tie him
  • Use it to send data to peer
  • Listen

Thus, one client fails while binding, and the other fails when listening with WSAEADDRINUSE and WSAECONNRESET errors . I obviously am doing something wrong and your help would be greatly appreciated. Thanks in advance.

P.S. UDP Hole Punching, , : http://www.brynosaurus.com/pub/net/p2pnat/

+1
1

recvfrom(), :

WSAECONNRESET

reset , . ; . UDP- , ICMP Port Unreachable.

, sendto() . , . ( ), , (), -. , "-" "-". , . , ?

+2

Source: https://habr.com/ru/post/1739815/

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