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Re: [SCTP-Discussion] UDP style problem


Chronological Thread 
  • From: Thomas Dreibholz <dreibh AT exp-math.uni-essen.de>
  • To: discussion AT sctp.de, Torbjörn Andersson <torbjorn.andersson AT kau.se>
  • Subject: Re: [SCTP-Discussion] UDP style problem
  • Date: Mon Jun 17 13:12:01 2002
  • List-id: SCTP Discussions <discussion.sctp.de>
  • Organization: University of Essen, Institute for Experimental Mathematics

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Am Freitag, 14. Juni 2002 13:53 schrieb Torbjörn Andersson:
> First I like to appologize for my errors in the first mail. I never use the
> ext_send(...) function at any time.
>
> The software I want to build is supposed to do this:
>
> The client starts with an argument of the IP address of the server and port
> number.
> The client then starts with doing a connect to the server, using the
> ext_connect(...) function.
> The server accepts the new connection and starts sending back data on
> several streams.
> When the server is done it closes the connection using ext_close(...) and a
> notification should then sent to the client when it has received all data.


1. In sctpsocketwrapper.cc, about line 1720, replace
if(tdSocket->Socket.SCTPSocketDesc.SCTPAssociationPtr != NULL)) {
by
if((tdSocket->Socket.SCTPSocketDesc.SCTPAssociationPtr != NULL) &&
(tdSocket->Socket.SCTPSocketDesc.ConnectionOriented)) {
This will fix the problem with the blocking recvmsg() call.

2. You program does not access the sctp_sndrcvinfo structure correctly,
therefore it does not print the received stream number correctly. Use
following code:
else{
// struct sctp_sndrcvinfo *sri = (struct sctp_sndrcvinfo
*)CMSG_FIRSTHDR(msg);
struct sctp_sndrcvinfo *sri = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
printf("%d bytes received at stream %d\n",nr,sri->sinfo_stream);
}

I have successfully tested the code with the new version of the socket API
which will be released about end of the week. Please mail whether the bugfix
works or produces more problems.


Best regards
- --
=======================================================================
Dipl.-Inform. Thomas Dreibholz

University of Essen, Room ES210
Inst. for Experimental Mathematics Ellernstraße 29
Computer Networking Technology Group D-45326 Essen/Germany
- -----------------------------------------------------------------------
E-Mail:
dreibh AT exp-math.uni-essen.de
Homepage: http://www.exp-math.uni-essen.de/~dreibh
=======================================================================

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