/*
* 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
*
* .
*
*/
/******************************************************************************
* Product of NIST/ITL Advanced Networking Technologies Division (ANTD). *
******************************************************************************/
package gov.nist.javax.sip.stack;
import gov.nist.javax.sip.header.*;
import gov.nist.javax.sip.message.*;
import gov.nist.javax.sip.parser.*;
import gov.nist.core.*;
import java.net.*;
import java.io.*;
import java.text.ParseException;
import java.util.TimerTask;
import javax.sip.address.Hop;
/*
* Ahmet Uyar <auyar@csit.fsu.edu>sent in a bug report for TCP operation of the JAIN sipStack.
* Niklas Uhrberg suggested that a mechanism be added to limit the number of simultaneous open
* connections. The TLS Adaptations were contributed by Daniel Martinez. Hagai Sela contributed a
* bug fix for symmetric nat. Jeroen van Bemmel added compensation for buggy clients ( Microsoft
* RTC clients ). Bug fixes by viswashanti.kadiyala@antepo.com, Joost Yervante Damand
*/
/**
* This is a stack abstraction for TCP connections. This abstracts a stream of parsed messages.
* The SIP sipStack starts this from the main SIPStack class for each connection that it accepts.
* It starts a message parser in its own thread and talks to the message parser via a pipe. The
* message parser calls back via the parseError or processMessage functions that are defined as
* part of the SIPMessageListener interface.
*
* @see gov.nist.javax.sip.parser.PipelinedMsgParser
*
*
* @author M. Ranganathan <br/>
*
* @version 1.2 $Revision: 1.59 $ $Date: 2009/11/20 04:45:53 $
*/
public class TCPMessageChannel extends MessageChannel implements SIPMessageListener, Runnable,
RawMessageChannel {
private Socket mySock;
private PipelinedMsgParser myParser;
protected InputStream myClientInputStream; // just to pass to thread.
protected OutputStream myClientOutputStream;
protected String key;
protected boolean isCached;
protected boolean isRunning;
private Thread mythread;
protected SIPTransactionStack sipStack;
protected String myAddress;
protected int myPort;
protected InetAddress peerAddress;
protected int peerPort;
protected String peerProtocol;
// Incremented whenever a transaction gets assigned
// to the message channel and decremented when
// a transaction gets freed from the message channel.
// protected int useCount;
private TCPMessageProcessor tcpMessageProcessor;
protected TCPMessageChannel(SIPTransactionStack sipStack) {
this.sipStack = sipStack;
}
/**
* Constructor - gets called from the SIPStack class with a socket on accepting a new client.
* All the processing of the message is done here with the sipStack being freed up to handle
* new connections. The sock input is the socket that is returned from the accept. Global data
* that is shared by all threads is accessible in the Server structure.
*
* @param sock Socket from which to read and write messages. The socket is already connected
* (was created as a result of an accept).
*
* @param sipStack Ptr to SIP Stack
*/
protected TCPMessageChannel(Socket sock, SIPTransactionStack sipStack,
TCPMessageProcessor msgProcessor) throws IOException {
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug("creating new TCPMessageChannel ");
sipStack.getStackLogger().logStackTrace();
}
mySock = sock;
peerAddress = mySock.getInetAddress();
myAddress = msgProcessor.getIpAddress().getHostAddress();
myClientInputStream = mySock.getInputStream();
myClientOutputStream = mySock.getOutputStream();
mythread = new Thread(this);
mythread.setDaemon(true);
mythread.setName("TCPMessageChannelThread");
// Stash away a pointer to our sipStack structure.
this.sipStack = sipStack;
this.peerPort = mySock.getPort();
this.tcpMessageProcessor = msgProcessor;
this.myPort = this.tcpMessageProcessor.getPort();
// Bug report by Vishwashanti Raj Kadiayl
super.messageProcessor = msgProcessor;
// Can drop this after response is sent potentially.
mythread.start();
}
/**
* Constructor - connects to the given inet address. Acknowledgement -- Lamine Brahimi (IBM
* Zurich) sent in a bug fix for this method. A thread was being uncessarily created.
*
* @param inetAddr inet address to connect to.
* @param sipStack is the sip sipStack from which we are created.
* @throws IOException if we cannot connect.
*/
protected TCPMessageChannel(InetAddress inetAddr, int port, SIPTransactionStack sipStack,
TCPMessageProcessor messageProcessor) throws IOException {
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug("creating new TCPMessageChannel ");
sipStack.getStackLogger().logStackTrace();
}
this.peerAddress = inetAddr;
this.peerPort = port;
this.myPort = messageProcessor.getPort();
this.peerProtocol = "TCP";
this.sipStack = sipStack;
this.tcpMessageProcessor = messageProcessor;
this.myAddress = messageProcessor.getIpAddress().getHostAddress();
// Bug report by Vishwashanti Raj Kadiayl
this.key = MessageChannel.getKey(peerAddress, peerPort, "TCP");
super.messageProcessor = messageProcessor;
}
/**
* Returns "true" as this is a reliable transport.
*/
public boolean isReliable() {
return true;
}
/**
* Close the message channel.
*/
public void close() {
try {
if (mySock != null) {
mySock.close();
mySock = null;
}
if (sipStack.isLoggingEnabled())
sipStack.getStackLogger().logDebug("Closing message Channel " + this);
} catch (IOException ex) {
if (sipStack.isLoggingEnabled())
sipStack.getStackLogger().logDebug("Error closing socket " + ex);
}
}
/**
* Get my SIP Stack.
*
* @return The SIP Stack for this message channel.
*/
public SIPTransactionStack getSIPStack() {
return sipStack;
}
/**
* get the transport string.
*
* @return "tcp" in this case.
*/
public String getTransport() {
return "TCP";
}
/**
* get the address of the client that sent the data to us.
*
* @return Address of the client that sent us data that resulted in this channel being
* created.
*/
public String getPeerAddress() {
if (peerAddress != null) {
return peerAddress.getHostAddress();
} else
return getHost();
}
protected InetAddress getPeerInetAddress() {
return peerAddress;
}
public String getPeerProtocol() {
return this.peerProtocol;
}
/**
* Send message to whoever is connected to us. Uses the topmost via address to send to.
*
* @param msg is the message to send.
* @param retry
*/
private void sendMessage(byte[] msg, boolean retry) throws IOException {
/*
* Patch from kircuv@dev.java.net (Issue 119 ) This patch avoids the case where two
* TCPMessageChannels are now pointing to the same socket.getInputStream().
*
* JvB 22/5 removed
*/
// Socket s = this.sipStack.ioHandler.getSocket(IOHandler.makeKey(
// this.peerAddress, this.peerPort));
Socket sock = this.sipStack.ioHandler.sendBytes(this.messageProcessor.getIpAddress(),
this.peerAddress, this.peerPort, this.peerProtocol, msg, retry, this);
// Created a new socket so close the old one and stick the new
// one in its place but dont do this if it is a datagram socket.
// (could have replied via udp but received via tcp!).
// if (mySock == null && s != null) {
// this.uncache();
// } else
if (sock != mySock && sock != null) {
try {
if (mySock != null)
mySock.close();
} catch (IOException ex) {
}
mySock = sock;
this.myClientInputStream = mySock.getInputStream();
this.myClientOutputStream = mySock.getOutputStream();
Thread thread = new Thread(this);
thread.setDaemon(true);
thread.setName("TCPMessageChannelThread");
thread.start();
}
}
/**
* Return a formatted message to the client. We try to re-connect with the peer on the other
* end if possible.
*
* @param sipMessage Message to send.
* @throws IOException If there is an error sending the message
*/
public void sendMessage(SIPMessage sipMessage) throws IOException {
byte[] msg = sipMessage.encodeAsBytes(this.getTransport());
long time = System.currentTimeMillis();
// JvB: also retry for responses, if the connection is gone we should
// try to reconnect
this.sendMessage(msg, /* sipMessage instanceof SIPRequest */true);
if (this.sipStack.getStackLogger().isLoggingEnabled(ServerLogger.TRACE_MESSAGES))
logMessage(sipMessage, peerAddress, peerPort, time);
}
/**
* 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 {
if (message == null || receiverAddress == null)
throw new IllegalArgumentException("Null argument");
Socket sock = this.sipStack.ioHandler.sendBytes(this.messageProcessor.getIpAddress(),
receiverAddress, receiverPort, "TCP", message, retry, this);
if (sock != mySock && sock != null) {
if (mySock != null) {
/*
* Delay the close of the socket for some time in case it is being used.
*/
sipStack.getTimer().schedule(new TimerTask() {
@Override
public boolean cancel() {
try {
mySock.close();
super.cancel();
} catch (IOException ex) {
}
return true;
}
@Override
public void run() {
try {
mySock.close();
} catch (IOException ex) {
}
}
}, 8000);
}
mySock = sock;
this.myClientInputStream = mySock.getInputStream();
this.myClientOutputStream = mySock.getOutputStream();
// start a new reader on this end of the pipe.
Thread mythread = new Thread(this);
mythread.setDaemon(true);
mythread.setName("TCPMessageChannelThread");
mythread.start();
}
}
/**
* 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 (sipStack.isLoggingEnabled())
sipStack.getStackLogger().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))) {
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().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 ")) {
String badReqRes = createBadReqRes(msgString, ex);
if (badReqRes != null) {
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug("Sending automatic 400 Bad Request:");
sipStack.getStackLogger().logDebug(badReqRes);
}
try {
this.sendMessage(badReqRes.getBytes(), this.getPeerInetAddress(), this
.getPeerPort(), false);
} catch (IOException e) {
this.sipStack.getStackLogger().logException(e);
}
} else {
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug(
"Could not formulate automatic 400 Bad Request");
}
}
}
throw ex;
} else {
sipMessage.addUnparsed(header);
}
}
/**
* Gets invoked by the parser as a callback on successful message parsing (i.e. no parser
* errors).
*
* @param sipMessage Mesage to process (this calls the application for processing the
* message).
*/
public void processMessage(SIPMessage sipMessage) throws Exception {
try {
if (sipMessage.getFrom() == null
|| // sipMessage.getFrom().getTag()
// == null ||
sipMessage.getTo() == null || sipMessage.getCallId() == null
|| sipMessage.getCSeq() == null || sipMessage.getViaHeaders() == null) {
String badmsg = sipMessage.encode();
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug(">>> Dropped Bad Msg");
sipStack.getStackLogger().logDebug(badmsg);
}
return;
}
ViaList viaList = sipMessage.getViaHeaders();
// For a request
// first via header tells where the message is coming from.
// For response, this has already been recorded in the outgoing
// message.
if (sipMessage instanceof SIPRequest) {
Via v = (Via) viaList.getFirst();
Hop hop = sipStack.addressResolver.resolveAddress(v.getHop());
this.peerProtocol = v.getTransport();
try {
this.peerAddress = mySock.getInetAddress();
// Check to see if the received parameter matches
// the peer address and tag it appropriately.
// JvB: dont do this. It is both costly and incorrect
// Must set received also when it is a FQDN, regardless
// whether
// it resolves to the correct IP address
// InetAddress sentByAddress =
// InetAddress.getByName(hop.getHost());
// JvB: if sender added 'rport', must always set received
if (v.hasParameter(Via.RPORT)
|| !hop.getHost().equals(this.peerAddress.getHostAddress())) {
v.setParameter(Via.RECEIVED, this.peerAddress.getHostAddress());
}
// @@@ hagai
// JvB: technically, may only do this when Via already
// contains
// rport
v.setParameter(Via.RPORT, Integer.toString(this.peerPort));
} catch (java.text.ParseException ex) {
InternalErrorHandler.handleException(ex, sipStack.getStackLogger());
}
// Use this for outgoing messages as well.
if (!this.isCached) {
((TCPMessageProcessor) this.messageProcessor).cacheMessageChannel(this);
this.isCached = true;
int remotePort = ((java.net.InetSocketAddress) mySock.getRemoteSocketAddress()).getPort();
String key = IOHandler.makeKey(mySock.getInetAddress(), remotePort);
sipStack.ioHandler.putSocket(key, mySock);
}
}
// Foreach part of the request header, fetch it and process it
long receptionTime = System.currentTimeMillis();
if (sipMessage instanceof SIPRequest) {
// This is a request - process the request.
SIPRequest sipRequest = (SIPRequest) sipMessage;
// Create a new sever side request processor for this
// message and let it handle the rest.
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug("----Processing Message---");
}
// Check for reasonable size - reject message
// if it is too long.
if (this.sipStack.getStackLogger().isLoggingEnabled(ServerLogger.TRACE_MESSAGES)) {
sipStack.serverLogger.logMessage(sipMessage, this.getPeerHostPort().toString(),
this.getMessageProcessor().getIpAddress().getHostAddress() + ":"
+ this.getMessageProcessor().getPort(), false, receptionTime);
}
if (sipStack.getMaxMessageSize() > 0
&& sipRequest.getSize()
+ (sipRequest.getContentLength() == null ? 0 : sipRequest
.getContentLength().getContentLength()) > sipStack
.getMaxMessageSize()) {
SIPResponse sipResponse = sipRequest
.createResponse(SIPResponse.MESSAGE_TOO_LARGE);
byte[] resp = sipResponse.encodeAsBytes(this.getTransport());
this.sendMessage(resp, false);
throw new Exception("Message size exceeded");
}
ServerRequestInterface sipServerRequest = sipStack.newSIPServerRequest(
sipRequest, this);
if (sipServerRequest != null) {
try {
sipServerRequest.processRequest(sipRequest, this);
} finally {
if (sipServerRequest instanceof SIPTransaction) {
SIPServerTransaction sipServerTx = (SIPServerTransaction) sipServerRequest;
if (!sipServerTx.passToListener())
((SIPTransaction) sipServerRequest).releaseSem();
}
}
} else {
if (sipStack.isLoggingEnabled())
this.sipStack.getStackLogger()
.logWarning("Dropping request -- could not acquire semaphore in 10 sec");
}
} else {
SIPResponse sipResponse = (SIPResponse) sipMessage;
// JvB: dont do this
// if (sipResponse.getStatusCode() == 100)
// sipResponse.getTo().removeParameter("tag");
try {
sipResponse.checkHeaders();
} catch (ParseException ex) {
if (sipStack.isLoggingEnabled())
sipStack.getStackLogger()
.logError("Dropping Badly formatted response message >>> "
+ sipResponse);
return;
}
// This is a response message - process it.
// Check the size of the response.
// If it is too large dump it silently.
if (sipStack.getMaxMessageSize() > 0
&& sipResponse.getSize()
+ (sipResponse.getContentLength() == null ? 0 : sipResponse
.getContentLength().getContentLength()) > sipStack
.getMaxMessageSize()) {
if (sipStack.isLoggingEnabled())
this.sipStack.getStackLogger().logDebug("Message size exceeded");
return;
}
ServerResponseInterface sipServerResponse = sipStack.newSIPServerResponse(
sipResponse, this);
if (sipServerResponse != null) {
try {
if (sipServerResponse instanceof SIPClientTransaction
&& !((SIPClientTransaction) sipServerResponse)
.checkFromTag(sipResponse)) {
if (sipStack.isLoggingEnabled())
sipStack.getStackLogger()
.logError("Dropping response message with invalid tag >>> "
+ sipResponse);
return;
}
sipServerResponse.processResponse(sipResponse, this);
} finally {
if (sipServerResponse instanceof SIPTransaction
&& !((SIPTransaction) sipServerResponse).passToListener())
((SIPTransaction) sipServerResponse).releaseSem();
}
} else {
sipStack
.getStackLogger()
.logWarning(
"Application is blocked -- could not acquire semaphore -- dropping response");
}
}
} finally {
}
}
/**
* This gets invoked when thread.start is called from the constructor. Implements a message
* loop - reading the tcp connection and processing messages until we are done or the other
* end has closed.
*/
public void run() {
Pipeline hispipe = null;
// Create a pipeline to connect to our message parser.
hispipe = new Pipeline(myClientInputStream, sipStack.readTimeout,
((SIPTransactionStack) sipStack).getTimer());
// Create a pipelined message parser to read and parse
// messages that we write out to him.
myParser = new PipelinedMsgParser(this, hispipe, this.sipStack.getMaxMessageSize());
// Start running the parser thread.
myParser.processInput();
// bug fix by Emmanuel Proulx
int bufferSize = 4096;
this.tcpMessageProcessor.useCount++;
this.isRunning = true;
try {
while (true) {
try {
byte[] msg = new byte[bufferSize];
int nbytes = myClientInputStream.read(msg, 0, bufferSize);
// no more bytes to read...
if (nbytes == -1) {
hispipe.write("\r\n\r\n".getBytes("UTF-8"));
try {
if (sipStack.maxConnections != -1) {
synchronized (tcpMessageProcessor) {
tcpMessageProcessor.nConnections--;
tcpMessageProcessor.notify();
}
}
hispipe.close();
mySock.close();
} catch (IOException ioex) {
}
return;
}
hispipe.write(msg, 0, nbytes);
} catch (IOException ex) {
// Terminate the message.
try {
hispipe.write("\r\n\r\n".getBytes("UTF-8"));
} catch (Exception e) {
// InternalErrorHandler.handleException(e);
}
try {
if (sipStack.isLoggingEnabled())
sipStack.getStackLogger().logDebug("IOException closing sock " + ex);
try {
if (sipStack.maxConnections != -1) {
synchronized (tcpMessageProcessor) {
tcpMessageProcessor.nConnections--;
// System.out.println("Notifying!");
tcpMessageProcessor.notify();
}
}
mySock.close();
hispipe.close();
} catch (IOException ioex) {
}
} catch (Exception ex1) {
// Do nothing.
}
return;
} catch (Exception ex) {
InternalErrorHandler.handleException(ex, sipStack.getStackLogger());
}
}
} finally {
this.isRunning = false;
this.tcpMessageProcessor.remove(this);
this.tcpMessageProcessor.useCount--;
myParser.close();
}
}
protected void uncache() {
if (isCached && !isRunning) {
this.tcpMessageProcessor.remove(this);
}
}
/**
* 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 {
TCPMessageChannel that = (TCPMessageChannel) other;
if (this.mySock != that.mySock)
return false;
else
return true;
}
}
/**
* Get an identifying key. This key is used to cache the connection and re-use it if
* necessary.
*/
public String getKey() {
if (this.key != null) {
return this.key;
} else {
this.key = MessageChannel.getKey(this.peerAddress, this.peerPort, "TCP");
return this.key;
}
}
/**
* Get the host to assign to outgoing messages.
*
* @return the host to assign to the via header.
*/
public String getViaHost() {
return myAddress;
}
/**
* Get the port for outgoing messages sent from the channel.
*
* @return the port to assign to the via header.
*/
public int getViaPort() {
return myPort;
}
/**
* Get the port of the peer to whom we are sending messages.
*
* @return the peer port.
*/
public int getPeerPort() {
return peerPort;
}
public int getPeerPacketSourcePort() {
return this.peerPort;
}
public InetAddress getPeerPacketSourceAddress() {
return this.peerAddress;
}
/**
* TCP Is not a secure protocol.
*/
public boolean isSecure() {
return false;
}
}