tor+healthcheck: fix healthcheck for multiple services

Fixes #6013.
This commit fixes the Tor healthcheck that would previously fail if
there were multiple hidden service registered.
In the controller, we only need to know that our service is contained in
the list of active services. But we can't do a string equality check
since there might be multiple services, comma separated.

docs/release-notes/release-notes-0.14.1.md

@@ -2,10 +2,18 @@
 
 ## Bug Fixes
 
-* [Fixed an inaccurate log message during a compaction failure](https://github.com/lightningnetwork/lnd/issues/5937)
-* [A bug has been fixed in channeldb that uses the return value without checking error](https://github.com/lightningnetwork/lnd/pull/6012)
+* [Fixed an inaccurate log message during a compaction
+  failure](https://github.com/lightningnetwork/lnd/pull/5961).
+
+* [Fixed a bug in the Tor controller that would cause the health check to fail
+  if there was more than one hidden service
+  configured](https://github.com/lightningnetwork/lnd/pull/6016).
+
+* [A bug has been fixed in channeldb that uses the return value without checking
+  the returned error first](https://github.com/lightningnetwork/lnd/pull/6012).
 
 # Contributors (Alphabetical Order)
 
 * Jamie Turley
-* nayuta-ueno
+* nayuta-ueno
+* Oliver Gugger

healthcheck/tor_connection.go

@@ -48,7 +48,7 @@ func CheckTorServiceStatus(tc *tor.Controller,
 		return restartTorController(tc, createService)
 
 	// If this is not a connection layer error, such as
-	// ErrServiceNotCreated or ErrServiceIDUnmatch, there's little we can
+	// ErrServiceNotCreated or ErrServiceIDMismatch, there's little we can
 	// do but to report the error to the user.
 	default:
 		return err

tor/cmd_info.go

@@ -3,16 +3,17 @@ package tor
 import (
 	"errors"
 	"fmt"
+	"strings"
 )
 
 var (
 	// ErrServiceNotCreated is used when we want to query info on an onion
 	// service while it's not been created yet.
 	ErrServiceNotCreated = errors.New("onion service hasn't been created")
 
-	// ErrServiceIDUnmatch is used when the serviceID the controller has
+	// ErrServiceIDMismatch is used when the serviceID the controller has
 	// doesn't match the serviceID the Tor daemon has.
-	ErrServiceIDUnmatch = errors.New("onion serviceIDs not match")
+	ErrServiceIDMismatch = errors.New("onion serviceIDs don't match")
 
 	// ErrNoServiceFound is used when the Tor daemon replies no active
 	// onion services found for the current control connection while we
@@ -62,10 +63,14 @@ func (c *Controller) CheckOnionService() error {
 	}
 
 	// Check that our active service is indeed the service acknowledged by
-	// Tor daemon.
-	if c.activeServiceID != serviceID {
+	// Tor daemon. The controller is only aware of a single service but the
+	// Tor daemon might have multiple services registered (for example for
+	// the watchtower as well as the node p2p connections). So we just want
+	// to check that our current controller's ID is contained in the list of
+	// registered services.
+	if !strings.Contains(serviceID, c.activeServiceID) {
 		return fmt.Errorf("%w: controller has: %v, Tor daemon has: %v",
-			ErrServiceIDUnmatch, c.activeServiceID, serviceID)
+			ErrServiceIDMismatch, c.activeServiceID, serviceID)
 	}
 
 	return nil

tor/cmd_info_test.go

@@ -61,7 +61,30 @@ func TestCheckOnionServiceFailOnServiceIDNotMatch(t *testing.T) {
 	require.NoError(t, err, "server failed to write")
 
 	// Check the error returned from GetServiceInfo is expected.
-	require.ErrorIs(t, c.CheckOnionService(), ErrServiceIDUnmatch)
+	require.ErrorIs(t, c.CheckOnionService(), ErrServiceIDMismatch)
+}
+
+func TestCheckOnionServiceSucceedOnMultipleServices(t *testing.T) {
+	t.Parallel()
+
+	// Create mock server and client connection.
+	proxy := createTestProxy(t)
+	defer proxy.cleanUp()
+	server := proxy.serverConn
+
+	// Assign a fake service ID to the controller.
+	c := &Controller{conn: proxy.clientConn, activeServiceID: "fakeID"}
+
+	// Mock a response with a different serviceID.
+	serverResp := "250-onions/current=service1,fakeID,service2\n250 OK\n"
+
+	// Let the server mocks a given response.
+	_, err := server.Write([]byte(serverResp))
+	require.NoError(t, err, "server failed to write")
+
+	// No error is expected, the controller's ID is contained within the
+	// list of active services.
+	require.NoError(t, c.CheckOnionService())
 }
 
 func TestCheckOnionServiceFailOnClosedConnection(t *testing.T) {