Add strongswan IPsec extend script#622
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Companion agent script for the LibreNMS 'strongswan' application. Emits the JSON SNMP extend payload (per-connection IPsec state, in/out traffic, child SAs, re-establishments + global rekey/error counters) by parsing 'swanctl --list-sas' and 'swanctl --counters'. Per-SA counters reset on rekey, so it keeps a small state file and emits monotonic cumulative counters for clean DERIVE rates. Works on OPNsense (legacy con<N> and new UUID 'Connections' model) and plain Linux strongSwan. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Add
strongswanIPsec extend scriptCompanion agent script for the new strongSwan / IPsec application proposed in
librenms/librenms#19858.
It outputs the LibreNMS JSON SNMP extend
payload describing every IPsec connection on a strongSwan host:
re-establishment count
invalid/invalid SPIerrors)It works by parsing
swanctl --list-sasandswanctl --counters. The raw per-SA byte/packetcounters reset on every rekey, so the script keeps a small state file
(
/var/lib/librenms-strongswan-state.json) and emits monotonic cumulative counters, givingLibreNMS clean DERIVE rates instead of spikes at each rekey.
Connection labels come from the OPNsense
config.xmlwhen present (covers both the legacy"Tunnel Settings"
con<N>model and the new "Connections" UUID model); on plain Linux strongSwanthe raw connection name is used.
Install
Tested on OPNsense 21.1 / 22.7 / 23.7 and Linux strongSwan, polled by LibreNMS 26.5.
swanctlis auto-detected viaPATHand the usual locations. Python 3, stdlib only.