feat(vpn): VPN_UP_COMMAND and VPN_DOWN_COMMAND options

internal/vpn/cleanup.go

@@ -3,9 +3,22 @@ package vpn
 import (
 	"context"
 	"errors"
+	"strings"
+
+	"github.com/qdm12/gluetun/internal/configuration/settings"
+	"github.com/qdm12/gluetun/internal/constants/vpn"
 )
 
 func (l *Loop) cleanup() {
+	settings := l.GetSettings()
+
+	var err error
+	commandString := strings.ReplaceAll(*settings.DownCommand, "{{VPN_INTERFACE}}", getVPNInterface(settings))
+	err = l.cmder.RunAndLog(context.Background(), commandString, l.logger)
+	if err != nil {
+		l.logger.Error("failed to run VPN down command: " + err.Error())
+	}
+
 	for _, vpnPort := range l.vpnInputPorts {
 		err := l.fw.RemoveAllowedPort(context.Background(), vpnPort)
 		if err != nil {
@@ -13,7 +26,7 @@ func (l *Loop) cleanup() {
 		}
 	}
 
-	err := l.publicip.ClearData()
+	err = l.publicip.ClearData()
 	if err != nil {
 		l.logger.Error("clearing public IP data: " + err.Error())
 	}
@@ -31,3 +44,14 @@ func (l *Loop) cleanup() {
 		l.logger.Error("stopping boring poll: " + err.Error())
 	}
 }
+
+func getVPNInterface(settings settings.VPN) string {
+	switch settings.Type {
+	case vpn.OpenVPN:
+		return settings.OpenVPN.Interface
+	case vpn.Wireguard:
+		return settings.Wireguard.Interface
+	default:
+		panic("invalid VPN type: " + settings.Type)
+	}
+}