[sr-dev] [kamailio/kamailio] Siptrace (#1912)

Ionut Ionita notifications at github.com
Thu Mar 28 12:57:47 CET 2019

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#### Type Of Change
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- [ ] Breaking change (fix or feature that would change existing functionality)

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- [ ] PR should be backported to stable branches
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#### Description
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Siptrace module has two different tracing concepts which do mostly the same thing. It has sip_trace function and it has trace_flag parameter which traces messages in a transaction. This pull request aims to have a single point of trace activation, that is when the user calls sip_trace() function from the script. Moreover, it adds 3 levels of tracing: message, transaction and dialog level tracing. This option is added as a parameter to sip_trace(), therefore the user can now summon sip_trace(duri, correlation_id, "m/t/d") where "m" stands for message, "t" for transaction and "d" for dialog.

The patch has been tested both locally and in our company's test system. Locally I've tested it using a few scenarios generated using sipp: successful call, negative reply(491 answer - hop-by-hop ACK), UAC CANCEL and dual bye scenario generated by Kamailio(dialog timeout). The only issue with current patch is it doesn't trace internally generated BYEs that is because they are only a buffer in Kamailio, not a parsed SIP message, therefore, after a few days of searching for solutions I didn't find any valid one. Parsing a SIP message for tracing didn't seem worth the processing time to me, but of course it can be added in the future.

Looking forward to your opinion or suggestions regarding the current patch.
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-- Commit Summary --

  * siptrace: add basic transaction and dialog level tracing
  * siptrace: trace negative ACKs
  * siptrace: check if a request is set to avoid local transaction crash
  * siptrace: Add code to trace incoming CANCEL transcations
  * siptrace: Minor code fixes; remove useless error logs
  * siptrace: store sip_trace destination parameter for the entire dialog
  * siptrace: remove unused trace flag
  * siptrace: update README

-- File Changes --

    M src/core/parser/msg_parser.h (1)
    M src/modules/siptrace/README (562)
    M src/modules/siptrace/doc/siptrace_admin.xml (33)
    M src/modules/siptrace/siptrace.c (864)
    M src/modules/siptrace/siptrace_data.h (14)

-- Patch Links --


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