On Sat, Jun 16, 2007 at 05:34:08PM -0700, Ravi Kondamuru wrote:
> I am implementing a tcp based custom protocol dissector. Each tcp
> conversation starts with a http request-response followed by a series
> of custom protocol data exchanges. I have been able to implement
> dissecting the custom protocol, however for the initial request/
> response, I am not able to figure out how to call the tcp
> sub-dissectors to take care of dissecting it. I have some rudimentary
> mechanism to identify if it is a http packet or a custom data packet.
Try looking at the http_payload_subdissector function in
epan/dissectors/packet-http.c to see how it calls the tcp sub-dissectors
based on the destination port number of a "CONNECT <hostname>:<port>"
request seen in the HTTP part of the conversation. Specifically look at
this call:
dissect_tcp_payload(next_tvb, pinfo, 0, tcpinfo->seq, /* 0 = offset */
tcpinfo->nxtseq, dissect_as,
pinfo->destport, tree, tree, tcpd);
Let us know if you need further assistance.
Steve
