fix(ns-plug): restarting ns-plug indefinetly

[Tbaile]

In case of something breaking (loss of connection or upstream server not available), restart ns-plug every 5 minutes to try and revive the process.

This needs to be tested even before merging for the following:

• Firewall connection loss
• Controller offline / not available
• Turn on/off ns-plug service (by removing the controller assignation and adding it back again)

Ref:

• ns-plug bootloops when restarted #1084

[gsanchietti]

The feature does not work as expected.

If the VPN connection is terminated because the controller is not reachable, the client enters in a loop state:

Mar  5 13:23:54 NethSec ns-plug[11742]: 2025-03-05 13:23:54 NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
Mar  5 13:23:54 NethSec ns-plug[11742]: 2025-03-05 13:23:54 TCP/UDP: Preserving recently used remote address: [AF_INET]206.189.3.76:20001
Mar  5 13:23:54 NethSec ns-plug[11742]: 2025-03-05 13:23:54 Socket Buffers: R=[212992->212992] S=[212992->212992]
Mar  5 13:23:54 NethSec ns-plug[11742]: 2025-03-05 13:23:54 UDPv4 link local: (not bound)
Mar  5 13:23:54 NethSec ns-plug[11742]: 2025-03-05 13:23:54 UDPv4 link remote: [AF_INET]206.189.3.76:20001
Mar  5 13:23:54 NethSec ns-plug[11742]: 2025-03-05 13:23:54 read UDPv4 [ECONNREFUSED]: Connection refused (fd=3,code=111)
Mar  5 13:23:57 NethSec ns-plug[11742]: 2025-03-05 13:23:57 read UDPv4 [ECONNREFUSED]: Connection refused (fd=3,code=111)
Mar  5 13:23:59 NethSec ns-plug[11742]: 2025-03-05 13:23:59 Server poll timeout, restarting
Mar  5 13:23:59 NethSec ns-plug[11742]: 2025-03-05 13:23:59 SIGUSR1[soft,server_poll] received, process restarting
Mar  5 13:23:59 NethSec ns-plug[11742]: 2025-03-05 13:23:59 WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.
Mar  5 13:23:59 NethSec ns-plug[11742]: 2025-03-05 13:23:59 NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
Mar  5 13:23:59 NethSec ns-plug[11742]: 2025-03-05 13:23:59 TCP/UDP: Preserving recently used remote address: [AF_INET]206.189.3.76:20001
Mar  5 13:23:59 NethSec ns-plug[11742]: 2025-03-05 13:23:59 Socket Buffers: R=[212992->212992] S=[212992->212992]
Mar  5 13:23:59 NethSec ns-plug[11742]: 2025-03-05 13:23:59 UDPv4 link local: (not bound)
Mar  5 13:23:59 NethSec ns-plug[11742]: 2025-03-05 13:23:59 UDPv4 link remote: [AF_INET]206.189.3.76:20001
Mar  5 13:23:59 NethSec ns-plug[11742]: 2025-03-05 13:23:59 read UDPv4 [ECONNREFUSED]: Connection refused (fd=3,code=111)
Mar  5 13:24:01 NethSec ns-plug[11742]: 2025-03-05 13:24:01 read UDPv4 [ECONNREFUSED]: Connection refused (fd=3,code=111)

If the VPN is not connected and controller it's not reachable, the ns-plug exists with 5 and procd does not restart it.

[Tbaile]

restart -> respawn

My bad.