[sr-dev] [kamailio] evapi event_route segfault crash when using $sel() to access custom options in cfg (#287)

[zxcpoiu]

=== Description ===
use $sel() in event_route from evapi module will cause segfault and kamailio crash.




=== How to re-produce ===

--- Step 1. kamailio.cfg: ---

# --- evapi params --- #
loadmodule "evapi.so"
modparam("evapi", "bind_addr", "127.0.0.1:8448")
modparam("evapi", "netstring_format", 1)
modparam("evapi", "workers", 4)


# --- set a custom options outside any route block
self.MYIP = "1.2.3.4"

# --- set event_route for evapi and invoke $sel;  both route will segfault and crash

event_route[evapi:connection-new] {
    xlog("L_NOTICE", "[ROUTEDEBUG][evapi:connection-new] new connection from $evapi(srcaddr):$evapi(srcport)");
    xlog("L_NOTICE", "[ROUTEDEBUG][evapi:connection-new] TEST sel: $sel(cfg_get.self.MYIP)");
}
event_route[evapi:message-received] {
    xlog("L_NOTICE", "[ROUTEDEBUG][evapi:message-received] test sel: $sel(cfg_get.self.MYIP)");
}

--- 2. try connect to evapi ---

You can use any client to try to connect or send message.
in bash, you can just use the following command to connect to and send a message:

exec 3<>/dev/tcp/127.0.0.1/5014; printf "5:Hello," >&3;


=== Debug level 3 error log at event_route[evapi:connection-new]  ===

Aug 12 16:35:07 SIP /home/pkg/kamailio/sbin/kamailio[47034]: NOTICE: <script>: [ROUTEDEBUG][evapi:connection-new] new connection from 127.0.0.1:27088
Aug 12 16:35:07 SIP /home/pkg/kamailio/sbin/kamailio[46977]: ALERT: <core> [main.c:728]: handle_sigs(): child process 47034 exited by a signal 11
Aug 12 16:35:07 SIP /home/pkg/kamailio/sbin/kamailio[46977]: ALERT: <core> [main.c:731]: handle_sigs(): core was not generated
Aug 12 16:35:07 SIP /home/pkg/kamailio/sbin/kamailio[46977]: INFO: <core> [main.c:743]: handle_sigs(): terminating due to SIGCHLD
Aug 12 16:35:07 SIP kernel: [28325875.619264] kamailio[47034]: segfault at 10 ip 00007f062cd91470 sp 00007fff5518e068 error 4 in libc-2.13.so[7f062cc6e000+182000]
Aug 12 16:35:07 SIP /home/pkg/kamailio/sbin/kamailio[47056]: INFO: <core> [main.c:794]: sig_usr(): signal 15 received
Aug 12 16:35:07 SIP /home/pkg/kamailio/sbin/kamailio[47057]: INFO: <core> [main.c:794]: sig_usr(): signal 15 received





---
Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/287
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