optionally pass auth client to dbus client

[jbbjarnason]

Now I am able to connect to remote dbus sessions and authenticating with the default EXTERNAL method.

example:

Future<DBusClient> connectRemoteSystemBus({
  required String remoteHost,
  required String sshUser,
  required String sshPassword,
  int remotePort = 22,
  int localPort = 7272,
}) async {
  // 1) Start the TCP server that will accept a D-Bus client connection
  final server = await ServerSocket.bind('127.0.0.1', localPort);
  print('Listening locally on ${server.address.address}:${server.port}');

  // 2) Set up the SSH session to run systemd-stdio-bridge on the remote
  final sshSocket = await SSHSocket.connect(remoteHost, remotePort);
  final client = SSHClient(
    sshSocket,
    username: sshUser,
    onPasswordRequest: () => sshPassword,
    onVerifyHostKey: (host, key) => true, // WARNING: verify in production!
  );

  // Start an SSH session that runs "systemd-stdio-bridge"
  final uidSession = await client.execute('id -u');
  final uid = String.fromCharCodes(await uidSession.stdout.first).trim();
  final session = await client.execute('systemd-stdio-bridge');
  print('SSH session started: systemd-stdio-bridge on $remoteHost');

  // 3) Create the DBusClient first
  final dbusAddress = DBusAddress.tcp('127.0.0.1', port: localPort);
  final dbusAuth = DBusAuthClient(uid: uid);
  final dbusClient = DBusClient(dbusAddress, authClient: dbusAuth);
  print(
      'DBusClient created. Will connect to tcp:host=127.0.0.1,port=$localPort');

  // 4) Set up a future for the client connection
  final serverSideSocketFuture = server.first;

  // 5) Make the D-Bus call which will trigger the connection
  print('Attempting D-Bus call: ListNames on org.freedesktop.DBus...');
  final dbusCallFuture = dbusClient.callMethod(
    destination: 'org.freedesktop.DBus',
    path: DBusObjectPath('/org/freedesktop/DBus'),
    interface: 'org.freedesktop.DBus',
    name: 'ListNames',
    replySignature: DBusSignature('as'),
  );

  // 6) Wait for the client to connect
  print('Waiting for client socket connection...');
  final serverSideSocket = await serverSideSocketFuture;
  print('Client connected to local port ${serverSideSocket.port}');

  // 7) Set up the pipes between local socket and SSH session
  serverSideSocket.pipe(session.stdin);
  session.stdout.cast<List<int>>().pipe(serverSideSocket);

  // 8) Now wait for the D-Bus call to complete
  await dbusCallFuture;
  print('D-Bus connection established successfully');

  return dbusClient;
}

[github-actions]

Hey! jbbjarnason has not signed the Canonical CLA which is required to get this contribution merged on this project.

Please head over to https://ubuntu.com/legal/contributors to read more about it.

[jbbjarnason]

not sure why I still get the cla error, i have already signed the form

[robert-ancell]

not sure why I still get the cla error, i have already signed the form

Thanks for that, there must be some issue with the data flowing through to the checker.

[robert-ancell]

Looks good, thanks!

[jbbjarnason]

Thanks for the quick review and release!