[sr-dev] Various fixes for Kamailio's IMS code

Wed Jan 8 13:08:34 CET 2014

Hi Hugh,

We have been pretty slack in managing back-porting for 2 reasons:

1. we have been focusing on master
2. neither myself nor Richard have experience with the git cherrypick
commands nor how far back to port patches

Going forward however we will make sure all bug fixes are back-ported. How
far back are we supposed to port the fixes?

Cheers
Jason

Cheers
Jason

On Wed, Jan 8, 2014 at 1:58 PM, Hugh Waite <hugh.waite at crocodile-rcs.com>wrote:

>  Hi,
> Marek Bazler posted a patch to implement SIP Digest authentication and
> Carsten said on Sunday he was looking at it. I expect they are the same
> though.
>
> There were a few IMS fixes in December, I was thinking about
> cherry-picking them to 4.1 ready for the 4.1.1 release on Thursday, but I
> don't want to get in the way of someone else (e.g. the developer that wrote
> it) doing the same thing!
>
> Hugh
>
>
> On 08/01/2014 11:45, Richard Good wrote:
>
>    Hi Rob
>
>  Thanks for the fixes, I hope you have everything working now.
>
>  sem_post issue:  we have had the same issue on Ubuntu and have added
> -lpthread to the Makefiles.  We didn't commit as we are not 100% sure of
> the impact on other OS'.  Does anyone have any objections to adding
> -lpthread to the Makefile of cdp, ims_qos and ims_registrar_pcscf?
>
>  seg_fault and memory management:  The seg fault has been fixed in the
> master branch.  Please feel free to commit the fix to 4.0.  The memory
> management does seem odd, this code comes from the OpenIMSCore project,
> will have a look and see if I can figure it out.
>
>  SIP digest: This was accidentally left off as we do not use it - please
> feel free to commit.
>
>  Config file: You are correct these are out of date in 4.0 - Please feel
> free to commit the fix to 4.0.  The master branch config files are up to
> date.
>
>  I recommend using the master branch for the time being as there are still
> quite a few changes coming through.
>
> Regards
> Richard.
>
>
>
>
>
>
>
> On 28 December 2013 23:04, Rob Day <rkd at rkd.me.uk> wrote:
>
>>  Hi,
>>
>> I've been trying to set up Kamailio 4.0.5 as a P-CSCF, I-CSCF and S-CSCF
>> today, and hit a few issues which I've fixed.
>> http://sip-router.org/contribute/ suggests that patches should be
>> submitted to this list, so here I am.
>>
>> The first issue I hit was the sem_post issue that has been reported from
>> time to time (
>> http://lists.kamailio.org/pipermail/sr-users/2013-January/076554.html) -
>> it looks as though sem_post is only included in -lpthread on Ubuntu 12.04,
>> not -lrt (https://bugs.launchpad.net/ubuntu/+source/manpages/+bug/874418),
>> so I've updated some Makefiles to reflect that.
>>
>> I subsequently hit a segfault when calling pcscf_save: I've tracked this
>> down to a while loop that was missing curly braces, and so tried to
>> dereference a null pointer. I think there's another bug in this piece of
>> code - because h is NULL at the end of the first while loop, we never go
>> round the second loop, and so never call free_rr. It looks like even if we
>> did, h->parsed has been set to 0 before we try and free it, so nothing
>> would happen. I wasn't sure how the memory management here works, though,
>> and so haven't tried to change this.
>>
>> I also found that the ims_auth module didn't handle standard SIP Digest
>> authentication on the MAR interface, only AKA and Digest-MD5 (which seems
>> to be specific to OpenIMSCore HSS, and not mentioned in the IMS specs).
>> Most of the code to allow SIP Digest authentication was already there, so I
>> just hooked the last piece in to get it to work. I'm not sure whether this
>> counts as a new feature or a bugfix - it's not clear whether this was meant
>> to be supported but just missing a piece, or not meant to be supported but
>> very easy to add in.
>>
>> Finally, I was working from the 4.0 nightlies Debian repository, and the
>> examples/scsf/kamailio.cfg file for 4.0.x seems to skip authentication. It
>> looks like this section has been reworked heavily in 4.1.0, so this may be
>> less important - but I put together a different kamailio.cfg based on a
>> mailing list post (
>> http://lists.sip-router.org/pipermail/sr-users/2013-March/077142.html),
>> and it might make sense to use that as the default file for 4.0.x.
>>
>> The attached patches are against the 4.0 branch in Git (specifically,
>> commit 1b98961522fd8a7eb73ecc7d1772541f8b81aabc). I'm happy to apply any
>> feedback which more knowledgeable contributors have.
>>
>> Best regards,
>> Rob
>>
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>>
>>
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>
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>
>
> --
> Hugh Waite
> Principal Design Engineer
> Crocodile RCS Ltd.
>
>
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