Description

With the latest master, I am trying to register UE in the IMS core. In the S-CSCF Diameter MAR message Authentication scheme is sent as 'unknown".
With Kamailio 5.5.1 works fine.
What I see the problem appears because of the following commits:
6eb67ea pv: handle case when var value ha flag str but null pointer
ffe3119 pv: fix condition in detecting the null string value when setting $var(...) - issue introduced in previous commit

Check the log messages below for detailed debug data.
pv $aa is empty but after line 711 $var(alg) is with len=1 and printed value '0'.

Reproduction

Try to Register UE to the IMS core with the latest master. Check MAR message AVP 612->avp 608 3GPP-SIP-Authentication-Scheme: unknown

Log Messages

In s-cscf kamailio.cfg route[REGISTER] I have the following code:
709 route[REGISTER] {
710 xlog("ALGORITHM IS [$aa] and User-Agent is [$ua]\n");
711 $var(alg) = $aa;
712 xlog("ALGORITHM IS [$var(alg)] and User-Agent is [$ua]\n");

733 #user has not been authenticated. Lets send a challenge via 401 Unauthorized
734 xlog("L_DBG","About to challenge! auth_ims\n");
735 ims_www_challenge("REG_MAR_REPLY", "$td", "$var(alg)");
736 exit;

LOG from master branch:
Log output for lines 710 and 712:
Nov 11 14:50:30 kamailio_scscf[31798]: 1(31851) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=710 a=25 n=xlog
Nov 11 14:50:30 kamailio_scscf[31798]: 1(31851) ERROR: <script>: ALGORITHM IS [] and User-Agent is [EE VOLTE]
Nov 11 14:50:30 kamailio_scscf[31798]: 1(31851) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=711 a=63 n=assign
Nov 11 14:50:30 kamailio_scscf[31798]: 1(31851) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=712 a=25 n=xlog
Nov 11 14:50:30 kamailio_scscf[31798]: 1(31851) ERROR: <script>: ALGORITHM IS [0] and User-Agent is [EE VOLTE]

Added and debug log into authorize.c:356 file:
...
LM_DBG(" #################### Sending MAR - 0, algo.len=%d algo[%.*s]\n", algo.len, algo.len, algo.s);
....
Log output:
Nov 11 14:50:30 kamailio_scscf[31798]: 1(31851) DEBUG: ims_auth [authorize.c:356]: challenge(): #################### Sending MAR - 0, algo.len=1 algo[0]

LOG from Kamailio 5.5.1:
117528 Nov 11 14:43:53 kamailio_scscf[19016]: 1(19060) ERROR: <script>: ALGORITHM IS [] and User-Agent is [EE VOLTE]
117529 Nov 11 14:43:53 kamailio_scscf[19016]: 1(19060) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=711 a=63 n=assign
117530 Nov 11 14:43:53 kamailio_scscf[19016]: 1(19060) ERROR: *** cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg] l=712 a=25 n=xlog
117531 Nov 11 14:43:53 kamailio_scscf[19016]: 1(19060) ERROR: <script>: ALGORITHM IS [] and User-Agent is [EE VOLTE]

Nov 11 14:43:53 mnc234 kamailio_scscf[19016]: 1(19060) DEBUG: ims_auth [authorize.c:356]: challenge(): #################### Sending MAR - 0, algo.len=0 algo[]]

SIP Traffic

Possible Solutions

Additional Information

version: kamailio 5.6.0-dev2 (x86_64/linux) ffe311-dirty
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, 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_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: ffe311 -dirty
compiled on 14:44:53 Nov 11 2021 with gcc 7.4.0

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.2 LTS"

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