### Description

After installing kamailio on Ubuntu (20.04 and 22.04) using normal kamailio.org instructions, things work fine. However, a developer is working on a large project as root, and occasionally restarts kamailio with the command "kamctl <start|stop|restart>", rather than the OS command "systemctl <stop|start|restart> kamailio". After that, any attempt to restart or check status using systmectl fails, and rebooting the server occasionally fails to restart kamailio.

### Troubleshooting

#### Reproduction

Install ubuntu 22.04 or 20.04. When up and running, try this: `systemctl status kamailio` (everything looks good) `ps -C kamailio -o comm,uid,euid,pid,ppid` (all happy, Kamailio running as user kamailio) `kamctl restart` `ps -C kamailio -o comm,uid,euid,pid,ppid` (Yes it's running, but as root, not kamailio) `systemctl status kamailio` (FAILS, 20.04 reports "Failed to start", 22.04 reports "kamailio.service: Deactivated successfully") `systemctl restart kamailio` (FAILS - same reports as preceding "status" command)

#### Debugging Data

<!-- If you got a core dump, use gdb to extract troubleshooting data - full backtrace, local variables and the list of the code at the issue location.

gdb /path/to/kamailio /path/to/corefile bt full info locals list

If you are familiar with gdb, feel free to attach more of what you consider to be relevant. -->

#### Log Messages

<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). --> After command systemctl restart kamailio: ``` Feb 9 18:30:02 usdc2-lab-drproxy02 kamailio: INFO: <core> [core/sctp_core.c:74]: sctp_core_check_support(): SCTP API not enabled - if you want to use it, load sctp module Feb 9 18:30:02 usdc2-lab-drproxy02 kamailio: INFO: <core> [core/tcp_main.c:5042]: init_tcp(): using epoll_lt as the io watch method (auto detected) Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: INFO: rr [../outbound/api.h:52]: ob_load_api(): unable to import bind_ob - maybe module is not loaded Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: INFO: rr [rr_mod.c:177]: mod_init(): outbound module not available Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: INFO: auth [auth_mod.c:345]: mod_init(): qop set, but nonce-count (nc_enabled) support disabled Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: INFO: <core> [main.c:2779]: main(): processes (at least): 32 - shm size: 67108864 - pkg size: 8388608 Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: INFO: <core> [core/udp_server.c:154]: probe_max_receive_buffer(): SO_RCVBUF is initially 212992 Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: INFO: <core> [core/udp_server.c:206]: probe_max_receive_buffer(): SO_RCVBUF is finally 425984 Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: INFO: <core> [core/udp_server.c:154]: probe_max_receive_buffer(): SO_RCVBUF is initially 212992 Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: INFO: <core> [core/udp_server.c:206]: probe_max_receive_buffer(): SO_RCVBUF is finally 425984 Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: ERROR: <core> [core/tcp_main.c:3162]: tcp_init(): bind(c, 0x7f49b0475c74, 16) on 127.0.0.1:5060 : Address already in use Feb 9 18:30:02 usdc2-lab-drproxy02 /usr/sbin/kamailio[2388]: INFO: <core> [core/sctp_core.c:53]: sctp_core_destroy(): SCTP API not initialized ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your sip traffic here) ```

### Possible Solutions

Modify kamctl et. al. to call systemctl for start, stop, restart commands. Alternatively have kamctl call setuid() before start, restart, stop commands.

### Additional Information

* **Kamailio Version** - output of `kamailio -v` On ubuntu 20.04: ``` version: kamailio 5.3.2 (x86_64/linux) 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_BLACKLIST, 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: unknown compiled with gcc 9.2.1 ``` For ubuntu 22.04: ``` version: kamailio 5.6.5 (x86_64/linux) 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: unknown compiled with gcc 11.4.0 ```

* **Operating System**:

For ubuntu 22.04: ``` root@my_22.04_ubuntu:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 22.04.3 LTS Release: 22.04 Codename: jammy root@my_22.04_ubuntu:~# uname -a Linux my_22.04_ubuntu 5.15.0-94-generic #104-Ubuntu SMP Tue Jan 9 15:25:40 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux root@my_22.04_ubuntu:~# ``` For ubuntu 20.04 ``` root@my_20.04_ubuntu:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.6 LTS Release: 20.04 Codename: focal root@my_20.04_ubuntu:~# uname -a Linux my_20.04_ubuntu 5.4.0-171-generic #189-Ubuntu SMP Fri Jan 5 14:23:02 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux root@my_20.04_ubuntu:~# ```