[En-Nut-Discussion] Getting remote ip address

[Harald Kipp]

Hi Georg,

Sorry it took some time to pull your post from
a large queue after the list server crash.

If you subribe at
http://www.egnite.de/mailman/listinfo.cgi/en-nut-discussion
your posts will appear in the list without approval.

Regarding your _real_ problem:
With TCP, you don't worry about the remote IP. You simply
send data back on the same socket (same connection).
See the tcps sample.

For UDP, you'll get the remote address (and port) from
NutUdpReceiveFrom(). Here's a simple snippet to give you
an idea:

     u_long raddr; <--- Remote's IP
     u_short rport; <--- Remote's port

     for (;;) {
         if ((got = NutUdpReceiveFrom(sock, &raddr, &rport, buff, 
sizeof(buff), 1000)) <= 0) {
             printf("Recv failed\n");
         }
         else {
             //printf("R%d-%s:%u\n", got, inet_ntoa(raddr), rport);
             if (NutUdpSendTo(sock, raddr, LOCALPORT, buff, got)) {
                 printf("Send failed\n");
             }
             else {
                 putchar('S');
             }
         }
     }

Harald