[self-solved] Can't listen to multicast group on multiply interfaces

[mailgate_user]

Hi!

Can somebody help me to make this idea work?

@
QUdpSocket udp;
udp.bind(12345);

QList<QNetworkInterface> if_list = QNetworkInterface::allInterfaces();
for(int i = 0 ; i < if_list.size(); ++i) {
   QNetworkInterface this_iface = if_list.at(i);
    QNetworkInterface::InterfaceFlags if_flags = this_iface.flags();

    // skip internal and down ifaces
    if(if_flags & QNetworkInterface::IsLoopBack || if_flags & QNetworkInterface::IsPointToPoint ||
            !(if_flags & QNetworkInterface::IsUp) || !(if_flags & QNetworkInterface::IsRunning)) continue;

    // skip not configured... for sure...
    QList<QNetworkAddressEntry> if_ips = this_iface.addressEntries();
    if(if_ips.size() == 0) continue;

    udp.joinMulticastGroup(QHostAddress("224.0.0.37"), this_iface);
 }

@

as for now, only the last iface, passing loop checks, is bound to the socket....

@
mac:~ user$ netstat -gs
...

en0:
inet 192.168.2.35
igmpv3 flags=0<> rv 2 qi 125 qri 10 uri 3
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::ca2a:14ff:fe26:a158
mldv2 flags=2<> rv 2 qi 125 qri 10 uri 3
group ff01::1%en0 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::2:8b1e:3eb2%en0 mode exclude
mcast-macaddr 33:33:8b:1e:3e:b2
group ff02::1%en0 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1:ff26:a158%en0 mode exclude
mcast-macaddr 33:33:ff:26:a1:58
group ff02::fb%en0 mode exclude
mcast-macaddr 33:33:00:00:00:fb
inet 192.168.2.35
igmpv3 flags=0<> rv 2 qi 125 qri 10 uri 3
group 224.0.0.251 mode exclude
mcast-macaddr 01:00:5e:00:00:fb
en1:
inet 192.168.1.35
igmpv2 flags=0<>
group 224.0.0.37 mode exclude
mcast-macaddr 01:00:5e:00:00:25
inet6 fe80::e6ce:8fff:fe05:45fe
mldv2 flags=2<> rv 2 qi 125 qri 10 uri 3
group ff02::fb%en1 mode exclude
mcast-macaddr 33:33:00:00:00:fb
inet 192.168.1.35
igmpv2 flags=0<>
group 224.0.0.251 mode exclude
mcast-macaddr 01:00:5e:00:00:fb
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::e6ce:8fff:fe05:45fe
mldv2 flags=2<> rv 2 qi 125 qri 10 uri 3
group ff01::1%en1 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::2:8b1e:3eb2%en1 mode exclude
mcast-macaddr 33:33:8b:1e:3e:b2
group ff02::1%en1 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1:ff05:45fe%en1 mode exclude
mcast-macaddr 33:33:ff:05:45:fe
@

[mailgate_user]

Bad luck, folks.... :(

the only possible (found by now) solution is a dirty glue in lib source:
@

bash-3.2$ pwd
/Volumes/data/qt-everywhere-opensource-src-4.8.2/src/network/socket
bash-3.2$ diff qnativesocketengine_unix.cpp.orig qnativesocketengine_unix.cpp
639a640,647

     for(int i = 0 ; i < addressEntries.size() ; ++i) {
         if (addressEntries.at(i).ip().protocol() == QAbstractSocket::IPv4Protocol) {
      firstIP = addressEntries.at(i).ip();
      break;
         } else continue;
     }

bash-3.2$
@

sad... sad, story....