/**
   * Send a message to a specified receiver address.
   *
   * @param msg string to send.
   * @param peerAddress Address of the place to send it to.
   * @param peerPort the port to send it to.
   * @throws IOException If there is trouble sending this message.
   */
  protected void sendMessage(byte[] msg, InetAddress peerAddress, int peerPort, boolean reConnect)
      throws IOException {
    // Via is not included in the request so silently drop the reply.
    if (sipStack.isLoggingEnabled() && this.sipStack.logStackTraceOnMessageSend) {
      this.sipStack.logWriter.logStackTrace(LogWriter.TRACE_MESSAGES);
    }
    if (peerPort == -1) {
      if (sipStack.isLoggingEnabled()) {
        this.sipStack.logWriter.logDebug(getClass().getName() + ":sendMessage: Dropping reply!");
      }
      throw new IOException("Receiver port not set ");
    } else {
      if (sipStack.isLoggingEnabled()) {
        this.sipStack.logWriter.logDebug(
            getClass().getName()
                + ":sendMessage "
                + peerAddress.getHostAddress()
                + "/"
                + peerPort
                + "\n"
                + new String(msg));
        this.sipStack.logWriter.logDebug("*******************\n");
      }
    }
    DatagramPacket reply = new DatagramPacket(msg, msg.length, peerAddress, peerPort);
    try {
      DatagramSocket sock;
      boolean created = false;

      if (sipStack.udpFlag) {
        // Use the socket from the message processor (for firewall
        // support use the same socket as the message processor
        // socket -- feature request # 18 from java.net). This also
        // makes the whole thing run faster!
        sock = ((UDPMessageProcessor) messageProcessor).sock;

        // Bind the socket to the stack address in case there
        // are multiple interfaces on the machine (feature reqeust
        // by Will Scullin) 0 binds to an ephemeral port.
        // sock = new DatagramSocket(0,sipStack.stackInetAddress);
      } else {
        // bind to any interface and port.
        sock = new DatagramSocket();
        created = true;
      }
      sock.send(reply);
      if (created) sock.close();
    } catch (IOException ex) {
      throw ex;
    } catch (Exception ex) {
      InternalErrorHandler.handleException(ex);
    }
  }
 /**
  * Constructor. We create one of these when we send out a message.
  *
  * @param targetAddr INET address of the place where we want to send messages.
  * @param port target port (where we want to send the message).
  * @param sipStack our SIP Stack.
  */
 protected UDPMessageChannel(
     InetAddress targetAddr,
     int port,
     SIPTransactionStack sipStack,
     UDPMessageProcessor messageProcessor) {
   peerAddress = targetAddr;
   peerPort = port;
   peerProtocol = "UDP";
   super.messageProcessor = messageProcessor;
   this.myAddress = messageProcessor.getIpAddress().getHostAddress();
   this.myPort = messageProcessor.getPort();
   this.sipStack = sipStack;
   if (sipStack.isLoggingEnabled()) {
     this.sipStack.logWriter.logDebug(
         "Creating message channel " + targetAddr.getHostAddress() + "/" + port);
   }
 }
  /**
   * Return a reply from a pre-constructed reply. This sends the message back to the entity who
   * caused us to create this channel in the first place.
   *
   * @param sipMessage Message string to send.
   * @throws IOException If there is a problem with sending the message.
   */
  public void sendMessage(SIPMessage sipMessage) throws IOException {
    if (sipStack.isLoggingEnabled() && this.sipStack.logStackTraceOnMessageSend) {
      if (sipMessage instanceof SIPRequest && ((SIPRequest) sipMessage).getRequestLine() != null) {
        /*
         * We dont want to log empty trace messages.
         */
        this.sipStack.logWriter.logStackTrace(LogWriter.TRACE_MESSAGES);
      } else {
        this.sipStack.logWriter.logStackTrace(LogWriter.TRACE_MESSAGES);
      }
    }

    // Test and see where we are going to send the messsage. If the message
    // is sent back to oursleves, just
    // shortcircuit processing.
    long time = System.currentTimeMillis();
    try {
      for (MessageProcessor messageProcessor : sipStack.getMessageProcessors()) {
        if (messageProcessor.getIpAddress().equals(this.peerAddress)
            && messageProcessor.getPort() == this.peerPort
            && messageProcessor.getTransport().equals(this.peerProtocol)) {
          MessageChannel messageChannel =
              messageProcessor.createMessageChannel(this.peerAddress, this.peerPort);
          if (messageChannel instanceof RawMessageChannel) {
            ((RawMessageChannel) messageChannel).processMessage(sipMessage);
            sipStack.logWriter.logDebug("Self routing message");
            return;
          }
        }
      }

      byte[] msg = sipMessage.encodeAsBytes(this.getTransport());

      sendMessage(msg, peerAddress, peerPort, peerProtocol, sipMessage instanceof SIPRequest);

    } catch (IOException ex) {
      throw ex;
    } catch (Exception ex) {
      sipStack.logWriter.logError("An exception occured while sending message", ex);
      throw new IOException("An exception occured while sending message");
    } finally {
      if (sipStack.logWriter.isLoggingEnabled(ServerLog.TRACE_MESSAGES))
        logMessage(sipMessage, peerAddress, peerPort, time);
    }
  }
 /**
  * Implementation of the ParseExceptionListener interface.
  *
  * @param ex Exception that is given to us by the parser.
  * @throws ParseException If we choose to reject the header or message.
  */
 public void handleException(
     ParseException ex, SIPMessage sipMessage, Class hdrClass, String header, String message)
     throws ParseException {
   if (sipStack.isLoggingEnabled()) this.sipStack.logWriter.logException(ex);
   // Log the bad message for later reference.
   if ((hdrClass != null)
       && (hdrClass.equals(From.class)
           || hdrClass.equals(To.class)
           || hdrClass.equals(CSeq.class)
           || hdrClass.equals(Via.class)
           || hdrClass.equals(CallID.class)
           || hdrClass.equals(RequestLine.class)
           || hdrClass.equals(StatusLine.class))) {
     sipStack.logWriter.logError("BAD MESSAGE!");
     sipStack.logWriter.logError(message);
     throw ex;
   } else {
     sipMessage.addUnparsed(header);
   }
 }
  /**
   * Send a message to a specified receiver address.
   *
   * @param msg message string to send.
   * @param peerAddress Address of the place to send it to.
   * @param peerPort the port to send it to.
   * @param peerProtocol protocol to use to send.
   * @throws IOException If there is trouble sending this message.
   */
  protected void sendMessage(
      byte[] msg, InetAddress peerAddress, int peerPort, String peerProtocol, boolean retry)
      throws IOException {
    // Via is not included in the request so silently drop the reply.
    if (peerPort == -1) {
      if (sipStack.isLoggingEnabled()) {
        this.sipStack.logWriter.logDebug(getClass().getName() + ":sendMessage: Dropping reply!");
      }
      throw new IOException("Receiver port not set ");
    } else {
      if (sipStack.isLoggingEnabled()) {
        this.sipStack.logWriter.logDebug(
            getClass().getName()
                + ":sendMessage "
                + peerAddress.getHostAddress()
                + "/"
                + peerPort
                + "\n"
                + new String(msg));
        this.sipStack.logWriter.logDebug("*******************\n");
      }
    }
    if (peerProtocol.compareToIgnoreCase("UDP") == 0) {
      DatagramPacket reply = new DatagramPacket(msg, msg.length, peerAddress, peerPort);

      try {
        DatagramSocket sock;
        if (sipStack.udpFlag) {
          sock = ((UDPMessageProcessor) messageProcessor).sock;

        } else {
          // bind to any interface and port.
          sock = sipStack.getNetworkLayer().createDatagramSocket();
        }
        if (sipStack.isLoggingEnabled()) {
          this.sipStack.logWriter.logDebug(
              "sendMessage "
                  + peerAddress.getHostAddress()
                  + "/"
                  + peerPort
                  + "\n"
                  + new String(msg));
        }
        sock.send(reply);
        if (!sipStack.udpFlag) sock.close();
      } catch (IOException ex) {
        throw ex;
      } catch (Exception ex) {
        InternalErrorHandler.handleException(ex);
      }

    } else {
      // Use TCP to talk back to the sender.
      Socket outputSocket =
          sipStack.ioHandler.sendBytes(
              this.messageProcessor.getIpAddress(), peerAddress, peerPort, "tcp", msg, retry);
      OutputStream myOutputStream = outputSocket.getOutputStream();
      myOutputStream.write(msg, 0, msg.length);
      myOutputStream.flush();
      // The socket is cached (dont close it!);
    }
  }
  /**
   * Actually proces the parsed message.
   *
   * @param sipMessage
   */
  public void processMessage(SIPMessage sipMessage) {

    if (sipMessage instanceof SIPRequest) {
      SIPRequest sipRequest = (SIPRequest) sipMessage;

      // This is a request - process it.
      // So far so good -- we will commit this message if
      // all processing is OK.
      if (sipStack.logWriter.isLoggingEnabled(ServerLog.TRACE_MESSAGES)) {

        this.sipStack.serverLog.logMessage(
            sipMessage,
            this.getPeerHostPort().toString(),
            this.getHost() + ":" + this.myPort,
            false,
            receptionTime);
      }
      ServerRequestInterface sipServerRequest = sipStack.newSIPServerRequest(sipRequest, this);
      // Drop it if there is no request returned
      if (sipServerRequest == null) {
        if (sipStack.isLoggingEnabled()) {
          this.sipStack.logWriter.logWarning("Null request interface returned -- dropping request");
        }

        return;
      }
      if (sipStack.isLoggingEnabled())
        this.sipStack.logWriter.logDebug(
            "About to process " + sipRequest.getFirstLine() + "/" + sipServerRequest);
      try {
        sipServerRequest.processRequest(sipRequest, this);
      } finally {
        if (sipServerRequest instanceof SIPTransaction) {
          SIPServerTransaction sipServerTx = (SIPServerTransaction) sipServerRequest;
          if (!sipServerTx.passToListener()) {
            ((SIPTransaction) sipServerRequest).releaseSem();
          }
        }
      }
      if (sipStack.isLoggingEnabled())
        this.sipStack.logWriter.logDebug(
            "Done processing " + sipRequest.getFirstLine() + "/" + sipServerRequest);

      // So far so good -- we will commit this message if
      // all processing is OK.

    } else {
      // Handle a SIP Reply message.
      SIPResponse sipResponse = (SIPResponse) sipMessage;
      try {
        sipResponse.checkHeaders();
      } catch (ParseException ex) {
        if (sipStack.isLoggingEnabled())
          sipStack.logWriter.logError(
              "Dropping Badly formatted response message >>> " + sipResponse);
        return;
      }
      ServerResponseInterface sipServerResponse = sipStack.newSIPServerResponse(sipResponse, this);
      if (sipServerResponse != null) {
        try {
          if (sipServerResponse instanceof SIPClientTransaction
              && !((SIPClientTransaction) sipServerResponse).checkFromTag(sipResponse)) {
            if (sipStack.isLoggingEnabled())
              sipStack.logWriter.logError(
                  "Dropping response message with invalid tag >>> " + sipResponse);
            return;
          }

          sipServerResponse.processResponse(sipResponse, this);
        } finally {
          if (sipServerResponse instanceof SIPTransaction
              && !((SIPTransaction) sipServerResponse).passToListener())
            ((SIPTransaction) sipServerResponse).releaseSem();
        }

        // Normal processing of message.
      } else {
        if (sipStack.isLoggingEnabled()) {
          this.sipStack.logWriter.logDebug("null sipServerResponse!");
        }
      }
    }
  }
  /**
   * Process an incoming datagram
   *
   * @param packet is the incoming datagram packet.
   */
  private void processIncomingDataPacket(DatagramPacket packet) throws Exception {
    this.peerAddress = packet.getAddress();
    int packetLength = packet.getLength();
    // Read bytes and put it in a eueue.
    byte[] bytes = packet.getData();
    byte[] msgBytes = new byte[packetLength];
    System.arraycopy(bytes, 0, msgBytes, 0, packetLength);

    // Do debug logging.
    if (sipStack.isLoggingEnabled()) {
      this.sipStack.logWriter.logDebug(
          "UDPMessageChannel: processIncomingDataPacket : peerAddress = "
              + peerAddress.getHostAddress()
              + "/"
              + packet.getPort()
              + " Length = "
              + packetLength);
    }

    SIPMessage sipMessage = null;
    try {
      this.receptionTime = System.currentTimeMillis();
      sipMessage = myParser.parseSIPMessage(msgBytes);
      myParser = null;
    } catch (ParseException ex) {
      myParser = null; // let go of the parser reference.
      if (sipStack.isLoggingEnabled()) {
        this.sipStack.logWriter.logDebug("Rejecting message !  " + new String(msgBytes));
        this.sipStack.logWriter.logDebug("error message " + ex.getMessage());
        this.sipStack.logWriter.logException(ex);
      }

      // JvB: send a 400 response for requests (except ACK)
      // Currently only UDP, @todo also other transports
      String msgString = new String(msgBytes, 0, packetLength);
      if (!msgString.startsWith("SIP/") && !msgString.startsWith("ACK ")) {

        String badReqRes = createBadReqRes(msgString, ex);
        if (badReqRes != null) {
          if (sipStack.isLoggingEnabled()) {
            sipStack.getLogWriter().logDebug("Sending automatic 400 Bad Request:");
            sipStack.getLogWriter().logDebug(badReqRes);
          }
          try {
            this.sendMessage(badReqRes.getBytes(), peerAddress, packet.getPort(), "UDP", false);
          } catch (IOException e) {
            this.sipStack.logWriter.logException(e);
          }
        } else {
          if (sipStack.isLoggingEnabled()) {
            sipStack.getLogWriter().logDebug("Could not formulate automatic 400 Bad Request");
          }
        }
      }

      return;
    }
    // No parse exception but null message - reject it and
    // march on (or return).
    // exit this message processor if the message did not parse.

    if (sipMessage == null) {
      if (sipStack.isLoggingEnabled()) {
        this.sipStack.logWriter.logDebug("Rejecting message !  + Null message parsed.");
      }
      return;
    }
    ViaList viaList = sipMessage.getViaHeaders();
    // Check for the required headers.
    if (sipMessage.getFrom() == null
        || sipMessage.getTo() == null
        || sipMessage.getCallId() == null
        || sipMessage.getCSeq() == null
        || sipMessage.getViaHeaders() == null) {
      String badmsg = new String(msgBytes);
      if (sipStack.isLoggingEnabled()) {
        this.sipStack.logWriter.logError("bad message " + badmsg);
        this.sipStack.logWriter.logError(
            ">>> Dropped Bad Msg "
                + "From = "
                + sipMessage.getFrom()
                + "To = "
                + sipMessage.getTo()
                + "CallId = "
                + sipMessage.getCallId()
                + "CSeq = "
                + sipMessage.getCSeq()
                + "Via = "
                + sipMessage.getViaHeaders());
      }

      sipStack.logWriter.logError("BAD MESSAGE!");

      return;
    }
    // For a request first via header tells where the message
    // is coming from.
    // For response, just get the port from the packet.
    if (sipMessage instanceof SIPRequest) {
      Via v = (Via) viaList.getFirst();
      Hop hop = sipStack.addressResolver.resolveAddress(v.getHop());
      this.peerPort = hop.getPort();
      this.peerProtocol = v.getTransport();

      this.peerPacketSourceAddress = packet.getAddress();
      this.peerPacketSourcePort = packet.getPort();
      try {
        this.peerAddress = packet.getAddress();
        // Check to see if the received parameter matches
        // the peer address and tag it appropriately.

        boolean hasRPort = v.hasParameter(Via.RPORT);
        if (hasRPort || !hop.getHost().equals(this.peerAddress.getHostAddress())) {
          v.setParameter(Via.RECEIVED, this.peerAddress.getHostAddress());
        }

        if (hasRPort) {
          v.setParameter(Via.RPORT, Integer.toString(this.peerPacketSourcePort));
        }
      } catch (java.text.ParseException ex1) {
        InternalErrorHandler.handleException(ex1);
      }

    } else {

      this.peerPacketSourceAddress = packet.getAddress();
      this.peerPacketSourcePort = packet.getPort();
      this.peerAddress = packet.getAddress();
      this.peerPort = packet.getPort();
      this.peerProtocol = ((Via) viaList.getFirst()).getTransport();
    }

    this.processMessage(sipMessage);
  }