[Ns-bugs] [Bug 828] New: PacketSocket::Close does not unregister protocol handler

[code@nsnam.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=828

           Summary: PacketSocket::Close does not unregister protocol
                    handler
           Product: ns-3
           Version: ns-3.7
          Platform: All
               URL: http://groups.google.com.au/group/ns-3-users/browse_fr
                    m/thread/835f6d32208b841f
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: node module
        AssignedTo: ns-bugs at isi.edu
        ReportedBy: quincy.tse at gmail.com
   Estimated Hours: 0.0


It seems that PacketSocket::Close doesn't work properly for me - I 
kept getting segfaults when packets are attempted to be forwarded 
through closed sockets that had already had the memory deallocated.

During a typical lifetime of a PacketSocket, the protocal handler is registered
in the function PacketSocket::DoBind, executed on transiting from STATE_OPEN to
STATE_BOUND. When transiting from STATE_BOUND to STATE_CONNECTED, the protocol
remains registered. In order to clean up properly, the PacketSocket should
unregister the protocol handler on close for the transitions
STATE_BOUND->STATE_CLOSED and STATE_CONNECTED->STATE_CLOSED.

Platform and version: NS-3.7 on Linux 2.6.31-14 (amd64), gcc 4.4.1

Have not developed test code to reproduce the segfault.

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