[SR-Users] [DKIM Failure] Re: SDP c= address as a key for a key-value lookup?
THegner at trilliumit.com
Tue Feb 19 17:15:08 CET 2013
Indeed, after sending my original message I noticed the avpops->avp_subst() function. I could use a combination of sdp_get() and avp_subst() to get what I need.
Perhaps a helpful set of functions for anyone would be a way to run a regex search against the message or sdp, and store any back-reference values directly to a set of AVPs.
Thanks for the tips you've all been most helpful,
From: sr-users-bounces at lists.sip-router.org [mailto:sr-users-bounces at lists.sip-router.org] On Behalf Of Carsten Bock
Sent: Tuesday, February 19, 2013 11:04 AM
To: SIP Router - Kamailio (OpenSER) and SIP Express Router (SER) - Users Mailing List
Subject: [DKIM Failure] Re: [SR-Users] SDP c= address as a key for a key-value lookup?
you could simply retrieve the SDP-Body using the function from SDPOps Module:
And then search the according C-Line with a regular expression.
Or you could use the internal API, see print_sdp_session.
2013/2/19 Hegner, Travis <THegner at trilliumit.com>:
> Hi All,
> I am working on a kamailio proxy with a very specific goal I need to
> What I would like to do is a key-value lookup, utilizing the SDP's
> media contact (c= line) IP as a key, and have a function return a
> value for that key. It appears that I can possibly accomplish this
> with the AVPops module, combined with DB_TEXT (maybe DB_MYSQL in the
> future) and a custom table with a custom query. The only thing I seem
> to be missing is the ability to extract the c= IP from the SDP, and
> store it as some kind of variable with which to do the lookup.
> I've looked into the iptrtpproxy module as it seems to have a select:
> @iptrtpproxy.sdp_ip that could work, but that module is extreme
> overkill for my purposes, and I am running into some issues getting it
> built for my platform (Ubuntu server 12.04). Also the documentation
> for that select
> states: "Return first rewritten IP provided at SDP c= line." However,
> I'm looking for the original sdp_ip, and have some concern that this
> won't return an IP that has not yet been re-written.
> My environment has a very specific 1:1 ratio of private network, to
> static public IP mappings. I currently have a successful OpenSER
> (1.3.2) deployment within this environment (running 5 years), which
> uses a hacked version of the old "mangler" module, with the function sdp_mangle_ip(<network>, <ip>).
> I could do something similar using textops->search_body() and
> nathelper->fix_nated_sdp(), but the risk of a typo or syntax error in
> config file every time I have to make a change or add a network is
> fairly high. Less importantly, there is some extra overhead as the
> proxy will have to test for every network on every SDP looking for a
> match (this is what the current deployment does). Eventually I'd like
> to add a simple frontend to add/edit networks on the fly, so that no one is ever touching the config.
> What would you folks recommend for this? Should I look at building a
> custom module which only grabs the c= IP and stores it into an AVP? Am
> I not seeing another module that will expose that information for me
> already? Would it simply be easier to work on getting iptrtpproxy
> built, and utilizing it only for the purpose of extracting the information I need from the SDP?
> Any insight would be most greatly appreciated.
> Travis Hegner
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