+ // Parse the TTL. The same value is used for unicast and multicast.
+ map<string, string>::const_iterator ttl_it = line.parameters.find("ttl");
+ if (ttl_it == line.parameters.end()) {
+ udpstream.ttl = -1;
+ } else {
+ udpstream.ttl = atoi(ttl_it->second.c_str());
+ }
+
+ // Parse the multicast interface index.
+ map<string, string>::const_iterator multicast_iface_it = line.parameters.find("multicast_output_interface");
+ if (multicast_iface_it == line.parameters.end()) {
+ udpstream.multicast_iface_index = -1;
+ } else {
+ udpstream.multicast_iface_index = if_nametoindex(multicast_iface_it->second.c_str());
+ if (udpstream.multicast_iface_index == 0) {
+ log(ERROR, "Interface '%s' does not exist", multicast_iface_it->second.c_str());
+ return false;
+ }
+ }
+