From hw@gilawa.com Tue Mar 19 10:31:09 2024
From: Henning Westerholt <hw@gilawa.com>
To: sr-users@lists.kamailio.org
Subject: [SR-Users] Re: http_async_query on carrierfailureroute changes rd
 back to carrieroute primary
Date: Tue, 19 Mar 2024 10:30:51 +0000
Message-ID: <VI1PR07MB5216439B6688E267EDBEEF65BF2C2@VI1PR07MB5216.eurprd07.prod.outlook.com>
In-Reply-To:
 <CAHkGiEeBn42RgrRZvb4AyqXF=V-e07YA32zgEB0_XhmWjUvz=A@mail.gmail.com>
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Hello,

Using http_async_query can change some script behaviour due to some side effe=
cts, I noticed this also e.g. on rtpengine functions.

I did not looked into your cfg in details, but one easy option from your side=
 would be to try a maintained Kamailio version (e.g. 5.7.x) and see if the pr=
oblem also is observable there.

Cheers,

Henning

From: Maharaja Azhagiah via sr-users <sr-users(a)lists.kamailio.org>
Sent: Montag, 18. M=C3=A4rz 2024 22:21
To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>
Cc: Maharaja Azhagiah <er.maharaja(a)gmail.com>
Subject: [SR-Users] http_async_query on carrierfailureroute changes rd back t=
o carrieroute primary

Hi

I am running kamailio 5.4 on debian

I have carrierfailureroute configured incase of primary service provider fail=
s. I also have Stirshaken configured to add Identity header on outbound calls=
. Issue is when call fail overs to carrierfailureroute, http_async_query chan=
ges $ru to the primary carrier

From the debug logs, when primary carrier sends a 488 (primary carrier expect=
s SIP TLS but my call is UDP - to test the failover scenario)

39(285) DEBUG: {1 18398 INVITE 8EmmsLqNuMRYBduMqFgX3w4JHAn4C2xn} tmx [t_var.c=
:561]: pv_get_tm_reply_code(): reply code is <488>
39(285) DEBUG: {1 18398 INVITE 8EmmsLqNuMRYBduMqFgX3w4JHAn4C2xn} carrierroute=
 [cr_func.c:178]: set_next_domain_on_rule(): searching for matching routing r=
ules39(285) INFO: {1 18398 INVITE 8EmmsLqNuMRYBduMqFgX3w4JHAn4C2xn} carrierro=
ute [cr_func.c:197]: set_next_domain_on_rule(): next_domain is 47987

Carrier route rewrites the failover carrier

39(285) INFO: {1 18398 INVITE 8EmmsLqNuMRYBduMqFgX3w4JHAn4C2xn} carrierroute =
[cr_func.c:706]: cr_do_route(): uri 14371234567 was rewritten to sip:14371234=
567(a)sip.primaryprovider.com<mailto:sip%3A14371234567(a)sip.primaryprovider.=
com>, carrier 1, domain 47987

Before http_async_query rd and ru are still the failover carrier

39(285) INFO: {1 18398 INVITE 8EmmsLqNuMRYBduMqFgX3w4JHAn4C2xn} <script>: [ca=
llid: 8EmmsLqNuMRYBduMqFgX3w4JHAn4C2xn] - [cfg:2976] - Debug testing ----- rd=
 is sip.primaryprovider.com<http://sip.primaryprovider.com> ----- ru is sip:1=
4371234567(a)sip.primaryprovider.com<mailto:sip%3A14371234567(a)sip.primarypr=
ovider.com>
39(285) DEBUG: {1 18398 INVITE 8EmmsLqNuMRYBduMqFgX3w4JHAn4C2xn} http_async_c=
lient [async_http.c:469]: async_send_query(): transaction suspended [5261:183=
0449764]
39(285) DEBUG: {1 18398 INVITE 8EmmsLqNuMRYBduMqFgX3w4JHAn4C2xn} http_async_c=
lient [async_http.c:625]: async_push_query(): query sent [https://authn-uat.c=
cid.neustar.biz/ccid/authn/v2/identity?apiKey=3Drandomkey] (0x7fdcad097e60) t=
o worker 1

However, when the route is being called after the http_async_query it changes=
 to the primary one:

26(272) DEBUG: tm [t_lookup.c:1612]: t_lookup_ident_filter(): transaction fou=
nd
26(272) DEBUG: http_async_client [async_http.c:235]: async_http_cb(): resumin=
g transaction (5261:1830449764)
26(272) DEBUG: tm [t_lookup.c:1612]: t_lookup_ident_filter(): transaction fou=
nd
26(272) INFO: <script>: [callid: 8EmmsLqNuMRYBduMqFgX3w4JHAn4C2xn] - [cfg:299=
5] - Debug testing ----- rd is 1.2.3.4 ----- ru is sip:14371234567(a)1.2.3.4:=
5061;transport=3DTLS

Due to this, call keeps going to the primary and it fails

if ( http_async_query(STIRSHAKEN_AS_URL, "AS_RESPONSE") =3D=3D -1 ) {
xlog("L_ERR ", "[cfg:$cfg(line)] Failed to connect AS service for token $fu -=
> $tu \n");
return;
}

route[AS_RESPONSE] {
xlog("L_INFO", "[callid: $ci] - [cfg:$cfg(line)] - Debug testing ----- rd is =
$rd ----- ru is $ru\n");
if ($http_ok) {
xlog("L_INFO", "[cfg:$cfg(line)] Resuming outbound call transaction for $fu -=
> $tu Received - $http_rb \n");
# Add identity and Date headers
if (jansson_get("identity", $http_rb, "$var(identity)")) {
insert_hf("Identity: $var(identity)\n", "Content-Length");
}
if (jansson_get("date", $http_rb, "$var(date)")) {
if ($hdr(Date) !=3D $null){
remove_hf("Date");
}
insert_hf("Date: $var(date)\n", "Identity");
}
} else {
xlog("L_ERR", "[cfg:$cfg(line)] Resuming outbound call transaction. Error -  =
$http_err)\n");
}

    route(RELAY);
exit;
}

Please help to understand why rd / ru changes to primary carrier.

Regards,
Maharaja Azhagiah



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--===============0567294816==--