public RelayCell receiveRelayResponse(int expectedCommand, Router extendTarget) {
final RelayCell cell = circuit.receiveRelayCell();
if (cell == null) {
throw new TorException("Timeout building circuit");
}
final int command = cell.getRelayCommand();
if (command == RelayCell.RELAY_TRUNCATED) {
final int code = cell.getByte() & 0xFF;
final String msg = CellImpl.errorToDescription(code);
final String source = nodeToName(cell.getCircuitNode());
if (code == Cell.ERROR_PROTOCOL) {
logProtocolViolation(source, extendTarget);
}
throw new TorException(
"Error from ("
+ source
+ ") while extending to ("
+ extendTarget.getNickname()
+ "): "
+ msg);
} else if (command != expectedCommand) {
final String expected = RelayCellImpl.commandToDescription(expectedCommand);
final String received = RelayCellImpl.commandToDescription(command);
throw new TorException(
"Received incorrect extend response, expecting "
+ expected
+ " but received "
+ received);
} else {
return cell;
}
}
private void sendCreateFastCell(TorCreateFastKeyAgreement kex) {
final Cell cell = CellImpl.createCell(circuit.getCircuitId(), Cell.CREATE_FAST);
cell.putByteArray(kex.createOnionSkin());
circuit.sendCell(cell);
}