[Serusers] Arbitrarily altering the "Contact:" field

[reticent]

Thanks for the cfg, it could be useful

I'm still having my original problem though, unless i'm really 
mis-understanding what subst(///) does (Substitute..)

Looking at the messages as they hit the wire shows that my subst rules 
(even Klaus' copied verbatim) only end up prepending the string that its 
supposed to be substituting.

I just compiled SER from the latest CVS to make sure and the problem 
still occurs (i havn't tested this on any of the stable releases)

Have you come across this Klaus?

Klaus Darilion wrote:

> Hi Tavis!
>
> I did similar things when a patched ser to work as outbound proxy 
> (e.g. like a jasomi peer point). It's a bad hack but it works fine 
> with me. The regexps are attached (to avoid line breaks in the email).
>
> These regexp works following:
> user at domain ==> user_domain at proxyIPaddress
>
> in the reply_route, it works the other way round
> user_domain at proxyIPaddress ==> user at domain
>
> To use it as outbound proxy, I also had to modify the save() function 
> to use user_domain at proxyIPaddress as AOR instead of the real AOR.
>
> regards,
> klaus
>
>
>
> reticent wrote:
>
>> I've got a situation where i need to replicate registrations to an 
>> outside proxy, a simple replicate wont work because i need the 
>> registration on the outside proxy to reference the SER proxy and not 
>> the client directly.
>>
>> The one requirement is that i know (in a scripting context) what the 
>> username of the registration is so i can construct a Contact that 
>> contains it.
>>
>> The only function i've found that could do this is the subst(///) 
>> function in the textops.so module, however its acting very strangely.
>>
>> Ex.
>>
>> subst('/^Contact:.*sip:([0-9]+)@.*$/Contact: 
>> <sip:\1@!OUTSIDE_PROXY!>/');
>>
>> Seems to match properly, but inspecting the packet as its routed out 
>> (using ngrep) shows the following contact field
>>
>> "<sip:200010001000@!OUTSIDE_PROXY!>sip:200010001000@!ORIGINAL_IP!:5070."
>>
>> My understanding is that "sip:200010001000@!ORIGINAL_IP!:5070" should 
>> have been replaced with <sip:200010001000@!OUTSIDE_PROXY!> instead of 
>> being prepended.
>>
>> Perhaps there is a module that provides a function that would allow 
>> me to manipulate the contact more easily (i'm aware that the regex in 
>> the subst in inadequate and would not match the full range of RFC3261 
>> valid Contact strings, i'm just testing right now)
>>
>> Would anyone be able to offer any advice?
>>
>> tavis
>>
>> _______________________________________________
>> Serusers mailing list
>> serusers at lists.iptel.org
>> http://lists.iptel.org/mailman/listinfo/serusers
>>
>>
>
>------------------------------------------------------------------------
>
>route[3]
>{
>        log(1, "Entering route[3]...");
>        fix_nated_register();
>
>        save_noreply("location");
>        #save("location");
>
>        # snom 200: Contact: <sip:klaus at 192.168.2.22:5060;transport=udp;line=50b9439q>;q=1.0
>        #                      \1        \2       \3    \4   \5
>        if ( subst('/^Contact:(.*)<sip:([^@]+)@([^;]*);(.*)>(.*)$/Contact:\1<sip:\2_\3 at 83.136.32.80;\4>\5/ig') ) {
>                log(1, "Contact in REGISTER rewritten - SNOM style\n");
>        }
>
>        #                      \1        \2       \3    \4
>        if ( subst('/^Contact:(.*)<sip:([^@]+)@([^;]*)>(.*)$/Contact:\1<sip:\2_\3 at 83.136.32.80>\4/ig') ) {
>                log(1, "Contact in REGISTER rewritten - SIPURA style\n");
>        }
>
>        #Contact: <sip:84.20.178.249:10247>;methods="INVITE, MESSAGE, INFO, OPTIONS, BYE, CANCEL, ACK, REFER"
>        #                      \1       \2   \3
>        if ( subst('/^Contact:(.*)<sip:([^@]+)>(.*)$/Contact:\1<sip:_\2 at 83.136.32.80>\3/ig') ) {   #Messenger style contact without username
>                log(1, "Contact in REGISTER rewritten - RTC API style\n");
>        }
>
>        t_on_reply("3");
>        t_relay();
>        log(1, "... leaving route[3]");
>        break;
>}
>
>onreply_route[3]
>{
>        log(1, "Entering onreply_route[3]...\n");
>
>        #                      \1         \2   \3   \4
>        if ( subst('/^Contact:(.*)<sip:_(.*?)@(.*)>(.*)$/Contact:\1<sip:\2>\4/ig') ) { #Messenger style contact without username
>                log(1, "Contact in REGISTER response rewritten - RTC API style\n");
>        }
>
>        #                      \1        \2      \3    \4     \5   \6
>        if ( subst('/^Contact:(.*)<sip:([^@]+)_(.*?)@([^;]*);(.*)>(.*)$/Contact:\1<sip:\2@\3;\5>\6/ig') ) {
>                log(1, "Contact in REGISTER respone rewritten - SNOM style\n");
>        };
>
>        #                      \1        \2      \3   \4   \5
>        if ( subst('/^Contact:(.*)<sip:([^@]+)_(.*?)@([^;]*)>(.*)$/Contact:\1<sip:\2@\3>\5/ig') ) {
>                log(1, "Contact in REGISTER respone rewritten - SIPURA style\n");
>        };
>
>        log(1, "leaving onreply_route(3)\n");
>}
>  
>