int getifaddrs_test(void)
{
struct ifaddrs *ifs = NULL;
struct ifaddrs *ifs_head = NULL;
int ret;
ret = getifaddrs(&ifs);
ifs_head = ifs;
if (ret != 0) {
fprintf(stderr, "getifaddrs() failed: %s\n", strerror(errno));
return 1;
}
while (ifs) {
printf("%-10s ", ifs->ifa_name);
if (ifs->ifa_addr != NULL) {
char addrstring[INET6_ADDRSTRLEN];
const char *result;
result = format_sockaddr(ifs->ifa_addr,
addrstring,
sizeof(addrstring));
if (result != NULL) {
printf("IP=%s ", addrstring);
}
if (ifs->ifa_netmask != NULL) {
result = format_sockaddr(ifs->ifa_netmask,
addrstring,
sizeof(addrstring));
if (result != NULL) {
printf("NETMASK=%s", addrstring);
}
} else {
printf("AF=%d ", ifs->ifa_addr->sa_family);
}
} else {
printf("<no address>");
}
printf("\n");
ifs = ifs->ifa_next;
}
freeifaddrs(ifs_head);
return 0;
}
/*
* Open a UDP socket for receiving messages.
*
* This is only left here for you to look at
*/
int udp_open(int local_port)
{
int fd;
struct sockaddr_in sin;
char buffer[32];
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0)
die0("Error creating UDP socket");
/* Bind the local socket to listen at the local_port. */
printf ("Binding locally to port %d\n", local_port);
memset((char *)&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(local_port);
if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0)
die0("Bind failed");
printf("UDP socket at %s configured\n",
format_sockaddr((struct sockaddr *)&sin, buffer));
return (fd);
}