PiBox » Iron Man » Monitor

It seems to me that specifying INADDR_ANY for the interface to add to the multicast group will tell the kernel to "pick" an interface as opposed to "pick all" interfaces. In order to add all interfaces (or at least the ones we want here) we need to

• call getifaddr to get a list of interfaces
• iterate through the list of interfaces
  • If type is INET and entry->ifa_name != "lo0" and entry->ifa_addr != NULL
    • struct sockaddr *foo = entry->ifa_addr
    • in_addr ip_addr = ((sockaddr_in)foo).sin_addr;

Then

    mreq.imr_multiaddr.s_addr=inet_addr(MULTICAST_IP);
    mreq.imr_interface.s_addr=htonl(ip_addr);
    if (setsockopt(sd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mreq,sizeof(mreq)) < 0)
    ...

This way each interface is specifically added to the group.

Implemented and tested on hardware. This fixes the problem of the monitor's piboxd not seeing the node's multicast request. Now it sees it.

Changes committed and pushed.

Closing issue.