handshake method

Future<bool> handshake()

Socks handshake.

Implementation

Future<bool> handshake() async {
  if (state != SocksConnectionState.initial) {
    throw StateError(
      'Handshake cannot be called after initial negotiations is done.',
    );
  }

  state = SocksConnectionState.handshaking;
  await _checkSocksVersion();

  int authenticationMethodsCount;
  authenticationMethodsCount = await readUint8();

  List<int> authenticationMethods;
  authenticationMethods = await readBytes(authenticationMethodsCount);

  if (authHandler != null) {
    if (!authenticationMethods.contains(AuthenticationMethod.password.byte)) {
      // No available authentication methods
      add([
        0x05, // Socks version
        AuthenticationMethod.invalid.byte,
      ]);

      return false;
    } else {
      await _passwordAuth();
    }
  } else {
    // No auth
    await _noAuth();
  }

  return true;
}