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Hi all,
using sctplib-1.0.9 I found that it is not possible to register two sctp instances using the same port number, but different ip addresses.
This violates the SCTP specification, and so I fixed it modifying the file disribution.c.
I implemented a quick&dirt solution in order to go ahead with my tests.
NOTE: my solution is not really correct because I have removed any check about seizedPorts, while I should check for unique <port/ip> pairs.
Nevertheless, below is the output of 'diff distribution.c distribuion.c-fixed'

269c269
< static unsigned char portsSeized[0x10000];
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> static char portsSeized[0x10000]; //Amedeo: see comment at allocatePort()
626,631c626,631
< if(portsSeized[port] == 0) {
< portsSeized[port] = 1;
< numberOfSeizedPorts++;
< return(port);
< }
< return(0);
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> //Amedeo - Fix in order to allow to register two sctp instances using different IPs, but same port.
> // This fix is error-prone because it never checks if a port is avaiable or
> // not. A more complete fix must handle unique <ip/port> pairs.
> portsSeized[port]++;
> numberOfSeizedPorts++;
> return(port);
654c654
< portsSeized[seizePort] = 1;
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> portsSeized[seizePort]++; //Amedeo: see comment at allocatePort()
672c672,676
< portsSeized[portSeized] = 0;
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> if ( portsSeized[portSeized] < 0 ) //Amedeo: see comment at allocatePort()
> {
> portsSeized[portSeized] = 0;
> error_log(ERROR_MINOR, "Warning: releasePort - reset to 0");
> }


Kind regards,
Amedeo

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• [SCTP-Discussion] problems registering sctp instances using the same port, Amedeo Bonfiglio, 01/18/2010
  • Re: [SCTP-Discussion] problems registering sctp instances using the same port, Michael Tüxen, 01/21/2010

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