- /* Presumably just broadcasting */
- if(setsockopt(bfd, SOL_SOCKET, SO_BROADCAST, &one, sizeof one) < 0)
- fatal(errno, "error setting SO_BROADCAST on broadcast socket");
+ struct ifreq *ifs;
+ int nifs;
+
+ /* See if the address matches the broadcast address of some interface */
+ ifreq_list(bfd, &ifs, &nifs);
+ for(n = 0; n < nifs; ++n) {
+ if(ioctl(bfd, SIOCGIFBRDADDR, &ifs[n]) < 0)
+ fatal(errno, "error calling ioctl SIOCGIFBRDADDR");
+ if(sockaddr_equal(&ifs[n].ifr_broadaddr, res->ai_addr))
+ break;
+ }
+ if(n < nifs) {
+ if(setsockopt(bfd, SOL_SOCKET, SO_BROADCAST, &one, sizeof one) < 0)
+ fatal(errno, "error setting SO_BROADCAST on broadcast socket");
+ info("broadcasting on %s (%s)", sockname, ifs[n].ifr_name);
+ } else
+ info("unicasting on %s", sockname);