Health probes (probe_health/refresh_health) are type-aware: WireGuard
checks the last WG handshake timestamp, OpenVPN checks the tun/tap
interface, Tor checks the control-port GETINFO, and sshuttle/proxy
types do a TCP reachability probe to the remote endpoint. Results are
persisted via set_connection_status and wired into the health_monitor_loop
so the UI always has a current health snapshot without polling.
Per-peer fail-open semantics: VPN, SSH, and proxy connections default to
fail-closed (kill-switch stays active even when the tunnel is down).
Tor defaults to fail-open. The default can be overridden per-peer via
set_peer_failopen/effective_failopen. apply_routes skips the fwmark and
kill-switch rules for any fail-open peer whose connection health is not
"working", letting traffic fall back to direct routing transparently.
New generic admin-only connection CRUD endpoints (GET/POST/PUT/DELETE
/api/connectivity/connections, GET /<id>/health, PUT
/api/connectivity/peers/<peer>/failopen) are guarded by the existing
admin role check. connection.create, connection.update, connection.delete,
and peer.failopen are all registered in ROUTE_ACTION_MAP for the audit
hook so every change is recorded in the owner-visible change log.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
