Hello,
I am considering to release Kamailio v5.7.7 (out of branch 5.7) on
Wednesday, May 21, 2025, as the last one from the 5.7.x series, to mark
the end of support for it. Currently 5.8.x and 6.0.x are the latest two
maintained branches.
Cheers,
Daniel
--
Daniel-Constantin Mierla (@ asipto.com)
twitter.com/miconda -- linkedin.com/in/miconda
Kamailio Consultancy, Training and Development Services -- asipto.com
amnapa created an issue (kamailio/kamailio#4205)
### Description
Using sCSCF sample found [here](https://github.com/kamailio/kamailio/blob/master/misc/examples/ims/sc…, after calling ims_www_challenge in REGISTER route block and sending a Diameter MAR request, the control is never passed to REG_MAR_REPLY route block and debug messages within REG_MAR_REPLY are not logged. This is not the case with REG_SAR_REPLY and PRE_REG_SAR_REPLY, those blocks are executed as expected.
```
######################################################################
# Route for handling Registrations:
######################################################################
route[REGISTER] {
xlog("ALGORITHM IS [$aa] and User-Agent is [$ua]\n");
$var(alg) = $aa;
if ($aa == $null) {
$var(alg) = "MD5"; #force to MD5 for zoiper.... non-ims
}
#!ifdef WITH_AUTH
if (!ims_www_authenticate("$td")) {
#!else
if (($var(alg) == "MD5") && (!ims_www_authenticate("$td"))) {
#!endif
if ($? == -2) {
send_reply("403", "Authentication Failed");
exit;
} else if ($? == -3) {
send_reply("400", "Bad Request");
exit;
} else if ($? == -9) {
xlog("L_DBG", "Authentication re-sync requested\n");
ims_www_resync_auth("REG_RESYNC_REPLY", "$td");
exit;
} else {
#user has not been authenticated. Lets send a challenge via 401 Unauthorized
xlog("L_DBG", "About to challenge! auth_ims\n");
ims_www_challenge("REG_MAR_REPLY", "$td", "$var(alg)");
exit;
}
} else {
xlog("L_DBG", "Auth succeeded\n");
# We need to check if this user is registered or not
if (!impu_registered("location")) {
xlog("L_ERR", "Not REGISTERED\n");
save("PRE_REG_SAR_REPLY", "location");
exit;
} else {
isc_match_filter_reg("1", "location");
save("REG_SAR_REPLY", "location");
exit;
}
}
}
route[REG_MAR_REPLY]
{
#this is async so to know status we have to check the reply avp
xlog("L_DBG", "maa_return code is $avp(s:maa_return_code)\n");
switch ($avp(s:maa_return_code)){
case 1: #success
xlog("L_DBG", "MAR success - 401/407 response sent from module\n");
break;
case -1: #failure
xlog("L_ERR", "MAR failure - error response sent from module\n");
break;
case -2: #error
xlog("L_ERR", "MAR error - sending error response now\n");
send_reply("500", "MAR failed");
break;
default:
xlog("L_ERR", "Unknown return code from MAR, value is [$avp(s:maa_return_code)]\n");
send_reply("500", "Unknown response code from MAR");
break;
}
exit;
}
```
### Troubleshooting
#### Reproduction
<!--
If the issue can be reproduced, describe how it can be done.
-->
#### Debugging Data
```
(paste your debugging data here)
```
#### Log Messages
```
ERROR: *** cfgtrace:request_route=[REGISTER] c=[/usr/local/etc/kamailio/kamailio.cfg] l=712 a=27 n=ims_www_challenge
DEBUG: ims_auth [authorize.c:290]: challenge(): Looking for route block [REG_MAR_REPLY]
INFO: ims_auth [cxdx_mar.c:76]: create_return_code(): created AVP successfully : [maa_return_code] - [-2]
DEBUG: ims_auth [authorize.c:314]: challenge(): Need to challenge for realm [ims.mnc072.mcc432.3gppnetwork.org]
DEBUG: ims_auth [authorize.c:321]: challenge(): Checking if REGISTER is authorized for realm [ims.mnc072.mcc432.3gppnetwork.org]...
DEBUG: ims_auth [authorize.c:1446]: get_auth_userdata(): Searching auth_userdata for IMPU sip:bob@ims.mnc072.mcc432.3gppnetwork.org (Hash 295)
DEBUG: ims_auth [authorize.c:1455]: get_auth_userdata(): Found auth_userdata
DEBUG: ims_auth [authorize.c:1061]: get_auth_vector(): looping through AV status is 3 and were looking for 0
DEBUG: tm [t_lookup.c:1343]: t_newtran(): msg (0x7f8d3f410cb0) id=1/11 global id=1/11 T start=(nil)
DEBUG: tm [t_lookup.c:498]: t_lookup_request(): start searching: hash=21555, isACK=0
DEBUG: tm [t_lookup.c:456]: matching_3261(): RFC3261 transaction matching failed - via branch [z9hG4bK3345.d6f2aff0d9192c2647aca3baea62cf94.1]
DEBUG: tm [t_lookup.c:681]: t_lookup_request(): no transaction found
DEBUG: tm [t_hooks.c:337]: run_reqin_callbacks_internal(): trans=0x7f8d2bff4520, callback type 1, id 0 entered
DEBUG: ims_auth [authorize.c:457]: challenge(): Suspending SIP TM transaction
DEBUG: ims_auth [authorize.c:1526]: multimedia_auth_request(): Sending MAR
DEBUG: ims_auth [cxdx_mar.c:572]: cxdx_send_mar(): Successfully sent async diameter
DEBUG: tm [t_lookup.c:1628]: t_lookup_ident_filter(): transaction found
INFO: ims_auth [cxdx_avp.c:134]: cxdx_get_avp(): cxdx_get_experimental_result_code: Failed finding avp (avp_code = 297, vendor_id = 0)
DEBUG: ims_auth [authorize.c:1557]: pack_challenge(): setting QOP str used is [, qop="auth"]
DEBUG: ims_auth [authorize.c:1559]: pack_challenge(): QOP str used is [, qop="auth"]
DEBUG: tm [t_reply.c:1660]: cleanup_uac_timers(): RETR/FR timers reset
DEBUG: tm [t_reply.c:595]: _reply_light(): reply sent out. buf=0x7f8d3f4120b8: SIP/2.0 401 Unauthor..., shmem=0x7f8d2bff9288: SIP/2.0 401 Unauthor
DEBUG: tm [t_reply.c:606]: _reply_light(): finished
DEBUG: ims_auth [authorize.c:1446]: get_auth_userdata(): Searching auth_userdata for IMPU sip:bob@ims.mnc072.mcc432.3gppnetwork.org (Hash 295)
DEBUG: ims_auth [authorize.c:1455]: get_auth_userdata(): Found auth_userdata
DEBUG: ims_auth [authorize.c:1679]: add_auth_vector(): Adding auth_vector (status 1) for IMPU sip:bob@ims.mnc072.mcc432.3gppnetwork.org / IMPI bob(a)ims.mnc072.mcc432.3gppnetwork.org (Hash 295)
DEBUG: ims_auth [cxdx_mar.c:483]: async_cdp_callback(): DBG:UAR Async CDP callback: ... Done resuming transaction
INFO: ims_auth [cxdx_mar.c:76]: create_return_code(): created AVP successfully : [maa_return_code] - [1]
DEBUG: ims_auth [cxdx_mar.c:495]: async_cdp_callback(): Destroying current transaction prevented!
DEBUG: tm [t_lookup.c:1620]: t_lookup_ident_filter(): transaction in terminated phase - skipping
ERROR: tm [t_suspend.c:196]: t_continue_helper(): active transaction not found
DEBUG: ims_auth [cxdx_mar.c:84]: free_saved_transaction_data(): Freeing saved transaction data: async
```
#### SIP Traffic
```
(paste your sip traffic here)
```
### Possible Solutions
The issue is related to ims_auth module, in [cxdx_mar.c ](https://github.com/kamailio/kamailio/blob/master/src/modules/ims_auth/cxdx_mar.c). within async_cdp_callback function, if I replace:
```
tmb.t_continue(data->tindex, data->tlabel, data->act);
````
with the following:
```
tmb.t_continue_skip_timer(data->tindex, data->tlabel, data->act);
```
the issue will be fixed and the control will be passed to REG_MAR_REPLY route block. In fact, in ims_registrar_scscf module, in [cxdx_sar.c ](https://github.com/kamailio/kamailio/blob/master/src/modules/ims_registrar_scscf/cxdx_sar.c) file, the t_continue_skip_timer is called instead of t_continue, if I replace it with t_continue the same issue happens for SAR callbacks.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 6.1.0-dev0 (x86_64/linux) c858ce-dirty
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: c858ce -dirty
compiled on 10:33:37 Apr 5 2025 with gcc 11.4.0
```
* **Operating System**:
```
Distributor ID: Ubuntu
Description: Ubuntu 22.04.5 LTS
Release: 22.04
Codename: jammy
Linux kuber-worker 5.15.0-133-generic #144-Ubuntu SMP Fri Feb 7 20:47:38 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
```
--
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