[SR-Users] libosip2 parse body error

Wed Oct 27 18:35:55 CEST 2010

What is interesting in this particular 200ok, is the fact that only
the IP was fixed:
 - the private IP was substituted with the public IP:
   - 192.168.254.1 -> 66.49.235.129
 - the length of both IPs is the same
 - the port was _not_ touched
  - 5022 was provided and 5022 was sent back

I don't know what kind of media proxy module is used by iptel.org, but
both mediaproxy and nathelper modules are changing the port number
too.  Don't know about iptrtpproxy.

Regards,
Ovidiu Sas

On Wed, Oct 27, 2010 at 12:10 PM, Jan Janak <jan at ryngle.com> wrote:
> The hex output Tony sent is actually much more useful than plain-text
> ngrep output you're asking for because it allows you to see the
> problem--you can easily count the number of bytes in the payload.
>
> The hex output may not be for humans to read, but it is for humans to count.
>
> And it appears that he is right. I counted 200 bytes (2 + 12*16 + 6)
> in the payload while the Content-Length header says 201.
>
> -Jan
>
> On Wed, Oct 27, 2010 at 6:27 AM, Daniel-Constantin Mierla
> <miconda at gmail.com> wrote:
>> Never ever send private emails - they will be discarded, keep the mailing
>> list cc-ed.
>>
>> Iptel org is running SIP Express Router 3.1. Take a ngrep of the traffic and
>> send it here, the hexa codes you send are not for humans to read, like we
>> are here on mailing lists. Otherwise make a tar.gz of pcap file. SER changes
>> content length only if it is an update to sdp (for nat traversal), otherwise
>> is the one set by the other phone.
>>
>> Daniel
>>
>> On 10/27/10 12:21 PM, t wrote:
>>
>> Thanks Daniel,
>>
>> fyi, the Content-Length doesn't match the actual length in the  invite ok
>> returned from iptel.org (213.192.59.75), and the same situation also occurs
>> from ekiga.net.
>>
>> libosip2 interprets the rfc as saying that this 'should' be correct. (and I
>> buy this!).
>>
>> it looks like an openser (opensips?) quirk.
>>
>> anyway, I have put in code locally to fixup the Content-Length.
>>
>> Thanks,
>> Tony.
>>
>>   73 75 62 0d 0a 43 6f 6e 74 65 6e 74 2d 4c 65 6e sub..Content-Len
>>   67 74 68 3a 20 20 20 32 30 31 0d 0a 0d 0a 76 3d gth:   201....v=
>>   30 0d 0a 6f 3d 74 77 69 6e 6b 6c 65 20 31 33 33 0..o=twinkle 133
>>   33 37 30 37 32 38 39 20 38 30 39 37 35 37 36 37 3707289 80975767
>>   33 20 49 4e 20 49 50 34 20 31 39 32 2e 31 36 38 3 IN IP4 192.168
>>   2e 32 35 34 2e 31 0d 0a 73 3d 2d 0d 0a 63 3d 49 .254.1..s=-..c=I
>>   4e 20 49 50 34 20 31 39 32 2e 31 36 38 2e 32 35 N IP4 192.168.25
>>   34 2e 31 0d 0a 74 3d 30 20 30 0d 0a 6d 3d 61 75 4.1..t=0 0..m=au
>>   64 69 6f 20 35 30 32 32 20 52 54 50 2f 41 56 50 dio 5022 RTP/AVP
>>   20 39 38 20 31 30 31 0d 0a 61 3d 72 74 70 6d 61  98 101..a=rtpma
>>   70 3a 39 38 20 73 70 65 65 78 2f 31 36 30 30 30 p:98 speex/16000
>>   0d 0a 61 3d 72 74 70 6d 61 70 3a 31 30 31 20 74 ..a=rtpmap:101 t
>>   65 6c 65 70 68 6f 6e 65 2d 65 76 65 6e 74 2f 38 elephone-event/8
>>   30 30 30 0d 0a 61 3d 66 6d 74 70 3a 31 30 31 20 000..a=fmtp:101
>>   30 2d 31 35 0d 0a                               0-15..
>>
>> On Wed, Oct 27, 2010 at 5:40 AM, Daniel-Constantin Mierla
>> <miconda at gmail.com> wrote:
>>>
>>> Hello,
>>>
>>> you claim that contact header is malformed or libosip2 has issues in
>>> parsing a good content header?
>>>
>>> In case of first option, can you tell what it believes is wrong. Your
>>> message is hard to follow since is not clear text, next time send only the
>>> text part.
>>>
>>> For the second option, you have to approach libosip2 support forums.
>>>
>>> Cheers,
>>> Daniel
>>>
>>> On 10/25/10 10:44 PM, t wrote:
>>>
>>> Hi,
>>>
>>> Not sure how to provide this info (or even if anybody cares), but libosip2
>>> parser objects to incorrect (short) Content-Length from iptel.org.
>>>
>>> Regards,
>>> Tony.
>>>
>>> _______________________________________________
>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>>> sr-users at lists.sip-router.org
>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>>
>>> --
>>> Daniel-Constantin Mierla
>>> http://www.asipto.com
>>
>> --
>> Daniel-Constantin Mierla
>> http://www.asipto.com
>>
>> _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>> sr-users at lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>
>>
>
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