[sr-dev] Change SIP message within module

[Cockhootec Yahrabee]

Thank you, Mikko,

I need to perform this actions inside my module (I don't want to use config
files and config functions to perform this actions) because the module
performs more actions than that ;-)
Also this means that it is not possible for me to just work on top of the
sdpops.

But thanks I will look at data lumps. It's shame that all useful functions
such as `msg_apply_changes()` (
https://github.com/kamailio/kamailio/blob/fcdf5f9cfff634ebfa736d7084d5e5483a36355b/modules/textopsx/textopsx.c#L149)
are static so it means that I need to copy&paste them when I want to use
them within module.

Also it is even possible to add SDP attribute by adding new data_lump?
Isn't data_lumps dedicated to manage SIP message headers?

I just need a solid answer for question: "Is the adding attribute to SDP
body implemented in Kamailio? If yes where can I find it and how can I use
it?"
If it is not implemented yet how can I contribute? It is easy as modifying
`buf` of `sip_msg`?

I am sorry maybe the subject of this email is not clear enough. I mentioned
changing SIP message but not SDP body.




On Wed, Apr 29, 2015 at 9:00 AM, Mikko Lehto <mslehto at iki.fi> wrote:

> Cockhootec Yahrabee <cockootec at gmail.com>:
>
> > I have function where I cast `sip_msg`'s `body` to `sdp_info` structure
> and
> > within this function I am changing some fields in `sessions` and
> `streams`
> > list.
> >
> > I am able to see changes when I am printing them after message leaves the
> > function but Kamailio sends the original message not the changed one. Do
> I
> > need somehow let the Kamailio know that the message was changed and it
> > should rebuild `buf` field? Or I need to change directly `buf` field
> within
> > `sip_msg`?
>
> You need to handle message modifications as data lumps.
> Have a look at Kamailio development guide:
> http://www.asipto.com/pub/kamailio-devel-guide/#c14datalump
>
> Also, look if you can extend sdpops module instead of baking new one:
> http://kamailio.org/docs/modules/devel/modules/sdpops.html
>
> Hope this helps :)
>
> --
> Mikko Lehto
>
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>
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