Re: [SR-Users] Executing a C function from the Kamailio Script

[Alex Balashov]

On 12/04/2015 12:25 PM, Mack Hendricks wrote:


Thanks…that what I was thinking, but the customer has the logic in a
C function already and he would like to reuse it.


Fair enough. So, why can't you take this C function and wrap it in a 
Kamailio module?


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Re: [SR-Users] Executing a C function from the Kamailio Script

[Mack Hendricks]

Hey Alex,

Thanks…that what I was thinking, but the customer has the logic in a C function 
already and he would like to reuse it.  

> On Dec 4, 2015, at 12:22 PM, Alex Balashov  wrote:
> 
> Mack,
> 
> The language modules take advantage of the fact that those other languages 
> (e.g. Lua, Python) are higher-level, _interpreted_ languages, and that their 
> interpreters provide an API for embedding them into C programs. One cannot 
> easily embed an on-the-fly C compiler into a C program.
> 
> Writing a Kamailio module is certainly the easiest way to call a custom C 
> function from route script, and it's not terribly hard to get started. If 
> your needs are very simple, you don't have to make extensive study of the 
> module API. Just follow/modify this example module:
> 
> https://github.com/kamailio/kamailio/tree/master/modules/print
> 
> 'print' is a stub that doesn't do anything, but provides a skeleton from 
> which you can build your own module.
> 
> I suppose you could also embed your C function into a library that can be 
> called from an interpreted language supported by Kamailio (Lua, Python, Perl, 
> etc.), but that seems like it would be vastly more complicated than writing a 
> Kamailio module.
> 
> Finally, are you one hundred percent sure that the functionality you need 
> cannot be achieved any other way?
> 
> -- Alex
> 
> -- 
> Alex Balashov | Principal | Evariste Systems LLC
> 303 Perimeter Center North, Suite 300
> Atlanta, GA 30346
> United States
> 
> Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> 
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Re: [SR-Users] Executing a C function from the Kamailio Script

[Alex Balashov]

Mack,

The language modules take advantage of the fact that those other 
languages (e.g. Lua, Python) are higher-level, _interpreted_ languages, 
and that their interpreters provide an API for embedding them into C 
programs. One cannot easily embed an on-the-fly C compiler into a C program.


Writing a Kamailio module is certainly the easiest way to call a custom 
C function from route script, and it's not terribly hard to get started. 
If your needs are very simple, you don't have to make extensive study of 
the module API. Just follow/modify this example module:


https://github.com/kamailio/kamailio/tree/master/modules/print

'print' is a stub that doesn't do anything, but provides a skeleton from 
which you can build your own module.


I suppose you could also embed your C function into a library that can 
be called from an interpreted language supported by Kamailio (Lua, 
Python, Perl, etc.), but that seems like it would be vastly more 
complicated than writing a Kamailio module.


Finally, are you one hundred percent sure that the functionality you 
need cannot be achieved any other way?


-- Alex

--
Alex Balashov | Principal | Evariste Systems LLC
303 Perimeter Center North, Suite 300
Atlanta, GA 30346
United States

Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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[SR-Users] Executing a C function from the Kamailio Script

[Mack Hendricks]

We have some logic in a C function that we would like to execute from the 
Kamailio script.  I see there are modules for calling functions in other 
languages.  But, I don’t see anything for C.  Is creating a module the only way 
to leverage this C function?

Thanks,

-Mack
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