return ret;
}
+int
+get_iface_index(const char *ifname)
+{
+ struct ifreq ir;
+ int sock;
+
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock < 0)
+ return 0;
+
+ memset(&ir, 0, sizeof(struct ifreq));
+
+ strncpy(ir.ifr_name, ifname, sizeof(ir.ifr_name));
+
+ if (ioctl(sock, SIOCGIFINDEX, &ir) < 0)
+ return 0;
+
+ close(sock);
+
+ return ir.ifr_ifindex;
+}
+
char*
get_hostname(void)
{
uint8_t ttl = 255;
int yes = 1;
int no = 0;
- struct sockaddr_in sa;
+ struct sockaddr_in sa = { 0 };
+ struct in_addr in;
+
+ inet_aton(iface_ip, &in);
sa.sin_family = AF_INET;
sa.sin_port = htons(MCAST_PORT);
inet_pton(AF_INET, MCAST_ADDR, &sa.sin_addr);
memset(&mreq, 0, sizeof(mreq));
- mreq.imr_address.s_addr = htonl(INADDR_ANY);
+ mreq.imr_address.s_addr = in.s_addr;
mreq.imr_multiaddr = sa.sin_addr;
+ mreq.imr_ifindex = iface_index;
if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
fprintf(stderr, "ioctl failed: IP_MULTICAST_TTL\n");
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
+ /* Some network drivers have issues with dropping membership of
+ * mcast groups when the iface is down, but don't allow rejoining
+ * when it comes back up. This is an ugly workaround
+ * -- this was copied from avahi --
+ */
+ setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
+
if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
close(fd);
}
void*
-memdup(void *d, int l)
+memdup(const void *d, int l)
{
void *r = malloc(l);
if (!r)