X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=udpstream.cpp;h=77476499a69a2e13b61d1708ef366f222359424d;hp=74d6ef03ce7853658e8836bbb4a07256e32c9e5c;hb=6544fa0ec3f3a501bcb89ea977756911bd7f3ebd;hpb=b08dc2a81825a298a03f2dee2ae7dd7045e72739

diff --git a/udpstream.cpp b/udpstream.cpp
index 74d6ef0..7747649 100644
--- a/udpstream.cpp
+++ b/udpstream.cpp
@@ -1,3 +1,4 @@
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 
@@ -9,7 +10,7 @@
 #define SO_MAX_PACING_RATE 47
 #endif
 
-UDPStream::UDPStream(const sockaddr_in6 &dst, uint32_t pacing_rate, int ttl)
+UDPStream::UDPStream(const sockaddr_in6 &dst, uint32_t pacing_rate, int ttl, int multicast_iface_index)
 	: dst(dst)
 {
 	sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
@@ -41,6 +42,18 @@ UDPStream::UDPStream(const sockaddr_in6 &dst, uint32_t pacing_rate, int ttl)
 			log_perror("setsockopt(IPV6_MULTICAST_HOPS)");
 		}
 	}
+
+	if (multicast_iface_index != -1) {
+		ip_mreqn mr;
+		memset(&mr, 0, sizeof(mr));
+		mr.imr_ifindex = multicast_iface_index;
+		if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, &mr, sizeof(mr)) == -1) {
+			log_perror("setsockopt(IP_MULTICAST_IF)");
+		}
+		if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_IF, &multicast_iface_index, sizeof(multicast_iface_index)) == -1) {
+			log_perror("setsockopt(IPV6_MULTICAST_IF)");
+		}
+	}
 }
 
 UDPStream::~UDPStream()