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/*
* Conditions Of Use
*
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain. As a result, a formal
* license is not needed to use the software.
*
* This software is provided by NIST as a service and is expressly
* provided "AS IS." NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY. NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
*
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
*
* .
*
*/
package android.gov.nist.javax.sip.stack;
import android.gov.nist.core.CommonLogger;
import android.gov.nist.core.LogWriter;
import android.gov.nist.core.StackLogger;
import android.gov.nist.javax.sip.header.CSeq;
import android.gov.nist.javax.sip.header.CallID;
import android.gov.nist.javax.sip.header.ContentLength;
import android.gov.nist.javax.sip.header.From;
import android.gov.nist.javax.sip.header.RequestLine;
import android.gov.nist.javax.sip.header.StatusLine;
import android.gov.nist.javax.sip.header.To;
import android.gov.nist.javax.sip.header.Via;
import android.gov.nist.javax.sip.message.SIPMessage;
import android.gov.nist.javax.sip.message.SIPRequest;
import android.gov.nist.javax.sip.message.SIPResponse;
import android.gov.nist.javax.sip.parser.NioPipelineParser;
import android.gov.nist.javax.sip.stack.NioTcpMessageProcessor.PendingData;
import static android.javax.sip.message.Response.SERVICE_UNAVAILABLE;
import java.io.IOException;
import java.net.InetAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.text.ParseException;
import java.util.HashMap;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import javax.net.ssl.SSLException;
import android.javax.sip.TransactionState;
public class NioTcpMessageChannel extends ConnectionOrientedMessageChannel {
private static StackLogger logger = CommonLogger
.getLogger(NioTcpMessageChannel.class);
protected SocketChannel socketChannel;
protected long lastActivityTimeStamp;
NioPipelineParser nioParser = null;
private static final int BUF_SIZE = 4096;
private final ByteBuffer byteBuffer = ByteBuffer.allocateDirect(BUF_SIZE);
public void readChannel() {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("NioTcpMessageChannel::readChannel");
}
this.isRunning = true;
try {
int nbytes = this.socketChannel.read(byteBuffer);
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("Read " + nbytes + " from socketChannel");
}
boolean streamError = nbytes == -1;
if(streamError)
throw new IOException("End-of-stream read (-1). " +
"This is usually an indication we are stuck and it is better to disconnect.");
// This prevents us from getting stuck in a selector thread spinloop when socket is constantly ready for reading but there are no bytes.
if(nbytes == 0)
throw new IOException("The socket is giving us empty TCP packets. " +
"This is usually an indication we are stuck and it is better to disconnect.");
byteBuffer.flip();
byte[] msg = new byte[byteBuffer.remaining()];
byteBuffer.get(msg);
byteBuffer.clear();
// Otherwise just add the bytes to queue
addBytes(msg);
lastActivityTimeStamp = System.currentTimeMillis();
} catch (Exception ex) { // https://java.net/jira/browse/JSIP-464 make sure to close connections on all exceptions to avoid the stack to hang
// Terminate the message.
if(ex instanceof IOException && !(ex instanceof SSLException)) {
try {
nioParser.addBytes("\r\n\r\n".getBytes("UTF-8"));
} catch (Exception e) {
// InternalErrorHandler.handleException(e);
}
}
try {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("I/O Issue closing sock " + ex.getMessage() + "myAddress:myport " + myAddress + ":" + myPort + ", remoteAddress:remotePort " + peerAddress + ":" + peerPort);
logger.logStackTrace();
}
close(true, false);
} catch (Exception ex1) {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG))
logger.logDebug("Issue closing the socket " + ex1);
}
}
// catch (Exception ex) {
// InternalErrorHandler.handleException(ex, logger);
// }
}
// TLS will override here to add decryption
protected void addBytes(byte[] bytes) throws Exception {
nioParser.addBytes(bytes);
}
protected NioTcpMessageChannel(NioTcpMessageProcessor nioTcpMessageProcessor,
SocketChannel socketChannel) throws IOException {
super(nioTcpMessageProcessor.getSIPStack());
super.myClientInputStream = socketChannel.socket().getInputStream();
try {
this.peerAddress = socketChannel.socket().getInetAddress();
this.peerPort = socketChannel.socket().getPort();
this.socketChannel = socketChannel;
super.mySock = socketChannel.socket();
// messages that we write out to him.
nioParser = new NioPipelineParser(sipStack, this,
this.sipStack.getMaxMessageSize());
this.peerProtocol = nioTcpMessageProcessor.transport;
lastActivityTimeStamp = System.currentTimeMillis();
super.key = MessageChannel.getKey(peerAddress, peerPort, nioTcpMessageProcessor.transport);
myAddress = nioTcpMessageProcessor.getIpAddress().getHostAddress();
myPort = nioTcpMessageProcessor.getPort();
} finally {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("Done creating NioTcpMessageChannel " + this + " socketChannel = " +socketChannel);
}
}
}
public NioTcpMessageChannel(InetAddress inetAddress, int port,
SIPTransactionStack sipStack,
NioTcpMessageProcessor nioTcpMessageProcessor) throws IOException {
super(sipStack);
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("NioTcpMessageChannel::NioTcpMessageChannel: "
+ inetAddress.getHostAddress() + ":" + port);
}
try {
messageProcessor = nioTcpMessageProcessor;
// Take a cached socket to the destination, if none create a new one and cache it
socketChannel = nioTcpMessageProcessor.nioHandler.createOrReuseSocket(
inetAddress, port);
peerAddress = socketChannel.socket().getInetAddress();
peerPort = socketChannel.socket().getPort();
super.mySock = socketChannel.socket();
peerProtocol = getTransport();
nioParser = new NioPipelineParser(sipStack, this,
this.sipStack.getMaxMessageSize());
NIOHandler nioHandler = nioTcpMessageProcessor.nioHandler;
nioHandler.putMessageChannel(socketChannel, this);
lastActivityTimeStamp = System.currentTimeMillis();
super.key = MessageChannel.getKey(peerAddress, peerPort, getTransport());
myAddress = nioTcpMessageProcessor.getIpAddress().getHostAddress();
myPort = nioTcpMessageProcessor.getPort();
} finally {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("NioTcpMessageChannel::NioTcpMessageChannel: Done creating NioTcpMessageChannel "
+ this + " socketChannel = " + socketChannel);
}
}
}
public SocketChannel getSocketChannel() {
return socketChannel;
}
@Override
protected void close(boolean removeSocket, boolean stopKeepAliveTask) {
try {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("Closing NioTcpMessageChannel "
+ this + " socketChannel = " + socketChannel);
}
NIOHandler nioHandler = ((NioTcpMessageProcessor) messageProcessor).nioHandler;
nioHandler.removeMessageChannel(socketChannel);
if(socketChannel != null) {
socketChannel.close();
}
if(nioParser != null) {
nioParser.close();
}
this.isRunning = false;
if(removeSocket) {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("Removing NioTcpMessageChannel "
+ this + " socketChannel = " + socketChannel);
}
((NioTcpMessageProcessor) this.messageProcessor).nioHandler.removeSocket(socketChannel);
((ConnectionOrientedMessageProcessor) this.messageProcessor).remove(this);
}
if(stopKeepAliveTask) {
cancelPingKeepAliveTimeoutTaskIfStarted();
}
} catch (IOException e) {
logger.logError("Problem occured while closing", e);
}
}
/**
* get the transport string.
*
* @return "tcp" in this case.
*/
public String getTransport() {
return this.messageProcessor.transport;
}
/**
* Send message to whoever is connected to us. Uses the topmost via address
* to send to.
*
* @param msg
* is the message to send.
* @param isClient
*/
protected void sendMessage(byte[] msg, boolean isClient) throws IOException {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("sendMessage isClient = " + isClient + " this = " + this);
}
lastActivityTimeStamp = System.currentTimeMillis();
NIOHandler nioHandler = ((NioTcpMessageProcessor) messageProcessor).nioHandler;
if(this.socketChannel != null && this.socketChannel.isConnected() && this.socketChannel.isOpen()) {
nioHandler.putSocket(NIOHandler.makeKey(this.peerAddress, this.peerPort), this.socketChannel);
}
sendTCPMessage(msg, this.peerAddress, this.peerPort, isClient);
}
/**
* Send a message to a specified address.
*
* @param message
* Pre-formatted message to send.
* @param receiverAddress
* Address to send it to.
* @param receiverPort
* Receiver port.
* @throws IOException
* If there is a problem connecting or sending.
*/
public void sendMessage(byte message[], InetAddress receiverAddress,
int receiverPort, boolean retry) throws IOException {
sendTCPMessage(message, receiverAddress, receiverPort, retry);
}
/**
* Send a message to a specified address.
*
* @param message
* Pre-formatted message to send.
* @param receiverAddress
* Address to send it to.
* @param receiverPort
* Receiver port.
* @throws IOException
* If there is a problem connecting or sending.
*/
public void sendTCPMessage(byte message[], InetAddress receiverAddress,
int receiverPort, boolean retry) throws IOException {
if (message == null || receiverAddress == null) {
logger.logError("receiverAddress = " + receiverAddress);
throw new IllegalArgumentException("Null argument");
}
lastActivityTimeStamp = System.currentTimeMillis();
if (peerPortAdvertisedInHeaders <= 0) {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("receiver port = " + receiverPort
+ " for this channel " + this + " key " + key);
}
if (receiverPort <= 0) {
// if port is 0 we assume the default port for TCP
this.peerPortAdvertisedInHeaders = 5060;
} else {
this.peerPortAdvertisedInHeaders = receiverPort;
}
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("2.Storing peerPortAdvertisedInHeaders = "
+ peerPortAdvertisedInHeaders + " for this channel "
+ this + " key " + key);
}
}
NIOHandler nioHandler = ((NioTcpMessageProcessor) messageProcessor).nioHandler;
SocketChannel sock = nioHandler.sendBytes(this.messageProcessor
.getIpAddress(), receiverAddress, receiverPort, this.messageProcessor.transport,
message, retry, this);
if (sock != socketChannel && sock != null) {
if (socketChannel != null) {
if (logger.isLoggingEnabled(LogWriter.TRACE_WARN)) {
logger
.logWarning("[2] Old socket different than new socket on channel "
+ key + socketChannel + " " + sock);
logger.logStackTrace();
logger.logWarning("Old socket local ip address "
+ socketChannel.socket().getLocalSocketAddress());
logger.logWarning("Old socket remote ip address "
+ socketChannel.socket().getRemoteSocketAddress());
logger.logWarning("New socket local ip address "
+ sock.socket().getLocalSocketAddress());
logger.logWarning("New socket remote ip address "
+ sock.socket().getRemoteSocketAddress());
}
close(false, false); // we can call socketChannel.close() directly but we better use the inherited method
socketChannel = sock;
nioHandler.putMessageChannel(socketChannel, this);
onNewSocket(message);
}
if (socketChannel != null) {
if (logger.isLoggingEnabled(LogWriter.TRACE_WARN)) {
logger
.logWarning("There was no exception for the retry mechanism so we keep going "
+ key);
}
}
socketChannel = sock;
}
}
public void onNewSocket(byte[] message) {
}
/**
* Exception processor for exceptions detected from the parser. (This is
* invoked by the parser when an error is detected).
*
* @param sipMessage
* -- the message that incurred the error.
* @param ex
* -- parse exception detected by the parser.
* @param header
* -- header that caused the error.
* @throws ParseException
* Thrown if we want to reject the message.
*/
public void handleException(ParseException ex, SIPMessage sipMessage,
Class hdrClass, String header, String message)
throws ParseException {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG))
logger.logDebug("Parsing Exception: " , 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(ContentLength.class)
|| hdrClass.equals(RequestLine.class) || hdrClass
.equals(StatusLine.class))) {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("Encountered Bad Message \n"
+ sipMessage.toString());
}
// JvB: send a 400 response for requests (except ACK)
// Currently only UDP, @todo also other transports
String msgString = sipMessage.toString();
if (!msgString.startsWith("SIP/") && !msgString.startsWith("ACK ")) {
if (socketChannel != null) {
if (logger.isLoggingEnabled(LogWriter.TRACE_ERROR)) {
logger
.logError("Malformed mandatory headers: closing socket! :"
+ socketChannel.toString());
}
try {
socketChannel.close();
} catch (IOException ie) {
if (logger.isLoggingEnabled(LogWriter.TRACE_ERROR)) {
logger.logError("Exception while closing socket! :"
+ socketChannel.toString() + ":" + ie.toString());
}
}
}
}
throw ex;
} else {
sipMessage.addUnparsed(header);
}
}
/**
* Equals predicate.
*
* @param other
* is the other object to compare ourselves to for equals
*/
public boolean equals(Object other) {
if (!this.getClass().equals(other.getClass()))
return false;
else {
NioTcpMessageChannel that = (NioTcpMessageChannel) other;
if (this.socketChannel != that.socketChannel)
return false;
else
return true;
}
}
/**
* TCP Is not a secure protocol.
*/
public boolean isSecure() {
return false;
}
public long getLastActivityTimestamp() {
return lastActivityTimeStamp;
}
public void triggerConnectSuccess() {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("Connection Success. Nothing else to do.");
}
}
public synchronized void triggerConnectFailure(Queue failedMsgs) {
//alert of IOException to pending Data TXs
while (failedMsgs != null && failedMsgs.peek() != null ) {
PendingData pData = failedMsgs.poll();
SIPTransaction transaction = sipStack.findTransaction(pData.txId, false);
if (transaction != null) {
if (transaction instanceof SIPClientTransaction) {
//8.1.3.1 Transaction Layer Errors
if (transaction.getRequest() != null &&
!transaction.getRequest().getMethod().equalsIgnoreCase("ACK"))
{
SIPRequest req = (SIPRequest) transaction.getRequest();
SIPResponse unavRes = req.createResponse(SERVICE_UNAVAILABLE, "Transport error sending request.");
try {
this.processMessage(unavRes);
} catch (Exception e) {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug("failed to report transport error", e);
}
}
}
} else {
//17.2.4 Handling Transport Errors
transaction.raiseIOExceptionEvent();
}
}
}
close();
}
}
