WARNING: latest handshake: never

Return WARNING if some peer never handshake yet.

README.md

@@ -49,6 +49,10 @@ CRITICAL: latest handshake is outside of CRITICAL threshold
 peer: 10.0.0.4/32
 latest handshake: 188016s ago
 threshold: 180000s | 'latest handshake'=188016s;300;180000;;
+
+$ check_wg handshake wg show wg0 dump
+WARNING: latest handshake: never
+peer: 10.0.0.4/32
 ```
 
 ```

cmd/handshake.go

@@ -41,6 +41,8 @@ func handshakeResponse(dump *wg.Dump, resp *monitoringplugin.Response) error {
 	peer := dump.OldestHandshake()
 	if peer == nil {
 		return errors.New("no valid peer found")
+	} else if checkNeverHandshake(peer, resp) {
+		return nil
 	}
 
 	d := time.Since(peer.LatestHandshake).Truncate(time.Second)
@@ -68,3 +70,13 @@ func handshakeResponse(dump *wg.Dump, resp *monitoringplugin.Response) error {
 	}
 	return nil
 }
+
+func checkNeverHandshake(peer *wg.DumpPeer, resp *monitoringplugin.Response,
+) bool {
+	if !peer.LatestHandshake.IsZero() {
+		return false
+	}
+	resp.UpdateStatus(monitoringplugin.WARNING, "latest handshake: never")
+	resp.UpdateStatus(monitoringplugin.WARNING, "peer="+peer.Name())
+	return true
+}