[asterisk-bugs] [JIRA] (ASTERISK-26069) Asterisk truncates To: header, dropping the closing '>'

[Vasil Kolev (JIRA)]

Vasil Kolev created ASTERISK-26069:
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             Summary: Asterisk truncates To: header, dropping the closing '>'
                 Key: ASTERISK-26069
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26069
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
    Affects Versions: 13.9.1
         Environment: Ubuntu 14.04 ia32
            Reporter: Vasil Kolev


As part of the development of push notifications for Windows phone for the Zoiper softphone, we've discovered that after some version (this AFAIK worked with 1.4), Asterisk starts truncating the To: header if it finds it too large. This leads to nasty issues, for example broken SIP packets in some cases.

Asterisk 11.9 didn't give a very useful message:

failed to extend from 256 to 427

Asterisk 13.9.1 gives the following:

[May 27 16:02:21] ERROR[25411][C-0000001b]: chan_sip.c:14348 initreqprep: The To header was truncated in call '25b40e7f1e385c1e498e17d35ef28515 at 10.8.1.11:5060'. This call setup will fail.

which is a bit more useful, but doesn't help with the problem itself. I'll attach a packet capture with the problem, where it's visible that asterisk sends an invite with a To: header that looks like this:

To: <sip:push1 at 10.8.3.92:50068;transport=TCP;rinstance=4015b61ba94093b5;X-PUSH-URI=http://e.notify.live.net/u/1/db5/H2QAAABZevVMbUI_okG-i5MjqfgHM8pKQ4-e3m7bKOGXxA9bBxPEXLj0gYK50BliT1FrnU8xtXJzYYPmTvQ1DIXqNfHK-MtAo3b9ppbBsGz6GjYHA-p-yAZ6R2r2xql6ViL727I/d2luZG9

(e.g. the closing '>' is missing). The contact is also truncated (there are some more bytes to it).

AFAIK in the code there are some static arrays to hold these headers, which creates the issue.

The RFCs don't have any limitation on these headers, and there are also drafts that use these fields extensively (see for example https://datatracker.ietf.org/doc/draft-ivanov-sipcore-pnsip/ ). This also seems to be a regression from previous versions, and not something we've found as an issue with other SIP gateways.




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