[Bug 33798] New: Multicast issue. Fail to receive packets from a multicast.

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=33798

             Bug #: 33798
           Summary: Multicast issue. Fail to receive packets from a
                    multicast.
           Product: Wine
           Version: 1.6-rc1
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: winsock
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: MaximeSedDev at gmail.com
    Classification: Unclassified


I have an error while receiving packets from a multicast. I think it is due to
the binding differences between POSIX and Windows.

On POSIX platforms, bind() acts like a filter. So when you specify a local
interface (say 192.168.0.1) it only receive packets specifically addressed to
there.

Since the multicast are addressed to a different interface (say 239.192.1.1),
bind() 192.168.0.1 means it won't receive any of them. However it works on
Windows and it means that you only want to receive packets from the local
interface 192.168.0.1. On POSIX, you should bind() 239.192.1.1 or INADDR_ANY
instead to receive the packets.

It seems that these differences are not handle in WINE(I checked on 1.4, 1.5
and 1.6).

A simple way to try this issue is with the msdn multicast sample: 
  RX:   http://msdn.microsoft.com/en-us/library/aa454098.aspx
  TX:   http://msdn.microsoft.com/en-us/library/aa454073.aspx
This will work on both Windows and Wine since it use "INADDR_ANY" but if you
specify the interfaces it will fail to receive the datagram on WINE.

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