Question

I cant seem to figure out how to do the next step for my UDP server. So far one client connects and then it sends data back and forth but when another client connects the server will take data from the new client and send it to the other.

I was going to check if the message that has been received is from a new client or not, if it is then give that client an identifier that the server uses to do some processing. Is that the correct way to do it? If so how do you do it? I know that recvfrom has “sockaddr *from” field which I assume fills that field with the data of the client but how do I use that data?

Thanks

Answer 1

sockaddr_in saddr;
int length = sizeof(saddr);
int read = recvfrom(your_socket, buff, 4096, 0, (sockaddr*)&saddr, &length);
if(read != -1) {
   // now saddr contains the address of the client
   // the g_addr is a previously captured client address
   if(saddr.sin_addr.S_un.S_addr = g_addr.sin_addr.S_un.S_addr) {
      // returning client?
   } else {
      // not yet seen client, so store address
   }
}