/*
* 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 United 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.core.StackLogger;
import gov.nist.javax.sip.SipStackImpl;
import java.io.IOException;
import java.io.OutputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.util.Enumeration;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import javax.net.ssl.HandshakeCompletedListener;
import javax.net.ssl.SSLHandshakeException;
import javax.net.ssl.SSLSocket;
/*
* TLS support Added by Daniel J.Martinez Manzano <dani@dif.um.es>
*
*/
/**
* Low level Input output to a socket. Caches TCP connections and takes care of
* re-connecting to the remote party if the other end drops the connection
*
* @version 1.2
*
* @author M. Ranganathan <br/>
*
*
*/
class IOHandler {
private SipStackImpl sipStack;
private static final String TCP = "tcp";
// Added by Daniel J. Martinez Manzano <dani@dif.um.es>
private static final String TLS = "tls";
// A cache of client sockets that can be re-used for
// sending tcp messages.
private final ConcurrentHashMap<String, Socket> socketTable = new ConcurrentHashMap<String, Socket>();
private final ConcurrentHashMap<String, Semaphore> socketCreationMap = new ConcurrentHashMap<String, Semaphore>();
//private Semaphore ioSemaphore = new Semaphore(1);
protected static String makeKey(InetAddress addr, int port) {
return addr.getHostAddress() + ":" + port;
}
protected IOHandler(SIPTransactionStack sipStack) {
this.sipStack = (SipStackImpl) sipStack;
}
protected void putSocket(String key, Socket sock) {
socketTable.put(key, sock);
}
protected Socket getSocket(String key) {
return (Socket) socketTable.get(key);
}
protected void removeSocket(String key) {
socketTable.remove(key);
socketCreationMap.remove(key);
}
/**
* A private function to write things out. This needs to be synchronized as
* writes can occur from multiple threads. We write in chunks to allow the
* other side to synchronize for large sized writes.
*/
private void writeChunks(OutputStream outputStream, byte[] bytes, int length)
throws IOException {
// Chunk size is 16K - this hack is for large
// writes over slow connections.
synchronized (outputStream) {
// outputStream.write(bytes,0,length);
int chunksize = 8 * 1024;
for (int p = 0; p < length; p += chunksize) {
int chunk = p + chunksize < length ? chunksize : length - p;
outputStream.write(bytes, p, chunk);
}
}
outputStream.flush();
}
/**
* Creates and binds, if necessary, a socket connected to the specified
* destination address and port and then returns its local address.
*
* @param dst
* the destination address that the socket would need to connect
* to.
* @param dstPort
* the port number that the connection would be established with.
* @param localAddress
* the address that we would like to bind on (null for the "any"
* address).
* @param localPort
* the port that we'd like our socket to bind to (0 for a random
* port).
*
* @return the SocketAddress that this handler would use when connecting to
* the specified destination address and port.
*
* @throws IOException
*/
public SocketAddress obtainLocalAddress(InetAddress dst, int dstPort,
InetAddress localAddress, int localPort) throws IOException {
String key = makeKey(dst, dstPort);
Socket clientSock = getSocket(key);
if (clientSock == null) {
clientSock = sipStack.getNetworkLayer().createSocket(dst, dstPort,
localAddress, localPort);
putSocket(key, clientSock);
}
return clientSock.getLocalSocketAddress();
}
/**
* Send an array of bytes.
*
* @param receiverAddress
* -- inet address
* @param contactPort
* -- port to connect to.
* @param transport
* -- tcp or udp.
* @param retry
* -- retry to connect if the other end closed connection
* @throws IOException
* -- if there is an IO exception sending message.
*/
public Socket sendBytes(InetAddress senderAddress,
InetAddress receiverAddress, int contactPort, String transport,
byte[] bytes, boolean retry, MessageChannel messageChannel)
throws IOException {
int retry_count = 0;
int max_retry = retry ? 2 : 1;
// Server uses TCP transport. TCP client sockets are cached
int length = bytes.length;
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug(
"sendBytes " + transport + " inAddr "
+ receiverAddress.getHostAddress() + " port = "
+ contactPort + " length = " + length);
}
if (sipStack.isLoggingEnabled()
&& sipStack.isLogStackTraceOnMessageSend()) {
sipStack.getStackLogger().logStackTrace(StackLogger.TRACE_INFO);
}
if (transport.compareToIgnoreCase(TCP) == 0) {
String key = makeKey(receiverAddress, contactPort);
// This should be in a synchronized block ( reported by
// Jayashenkhar ( lucent ).
Socket clientSock = null;
enterIOCriticalSection(key);
try {
clientSock = getSocket(key);
while (retry_count < max_retry) {
if (clientSock == null) {
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug(
"inaddr = " + receiverAddress);
sipStack.getStackLogger().logDebug(
"port = " + contactPort);
}
// note that the IP Address for stack may not be
// assigned.
// sender address is the address of the listening point.
// in version 1.1 all listening points have the same IP
// address (i.e. that of the stack). In version 1.2
// the IP address is on a per listening point basis.
clientSock = sipStack.getNetworkLayer().createSocket(
receiverAddress, contactPort, senderAddress);
OutputStream outputStream = clientSock
.getOutputStream();
writeChunks(outputStream, bytes, length);
putSocket(key, clientSock);
break;
} else {
try {
OutputStream outputStream = clientSock
.getOutputStream();
writeChunks(outputStream, bytes, length);
break;
} catch (IOException ex) {
if (sipStack.isLoggingEnabled())
sipStack.getStackLogger().logDebug(
"IOException occured retryCount "
+ retry_count);
// old connection is bad.
// remove from our table.
removeSocket(key);
try {
clientSock.close();
} catch (Exception e) {
}
clientSock = null;
retry_count++;
}
}
}
} catch (IOException ex) {
removeSocket(key);
throw ex;
} finally {
leaveIOCriticalSection(key);
}
if (clientSock == null) {
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug(
this.socketTable.toString());
sipStack.getStackLogger().logError(
"Could not connect to " + receiverAddress + ":"
+ contactPort);
}
throw new IOException("Could not connect to " + receiverAddress
+ ":" + contactPort);
} else
return clientSock;
// Added by Daniel J. Martinez Manzano <dani@dif.um.es>
// Copied and modified from the former section for TCP
} else if (transport.compareToIgnoreCase(TLS) == 0) {
String key = makeKey(receiverAddress, contactPort);
Socket clientSock = null;
enterIOCriticalSection(key);
try {
clientSock = getSocket(key);
while (retry_count < max_retry) {
if (clientSock == null) {
clientSock = sipStack.getNetworkLayer()
.createSSLSocket(receiverAddress, contactPort,
senderAddress);
SSLSocket sslsock = (SSLSocket) clientSock;
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug(
"inaddr = " + receiverAddress);
sipStack.getStackLogger().logDebug(
"port = " + contactPort);
}
HandshakeCompletedListener listner = new HandshakeCompletedListenerImpl(
(TLSMessageChannel) messageChannel);
((TLSMessageChannel) messageChannel)
.setHandshakeCompletedListener(listner);
sslsock.addHandshakeCompletedListener(listner);
sslsock.setEnabledProtocols(sipStack
.getEnabledProtocols());
sslsock.startHandshake();
if (sipStack.isLoggingEnabled()) {
this.sipStack.getStackLogger().logDebug(
"Handshake passed");
}
// allow application to enforce policy by validating the
// certificate
try {
sipStack
.getTlsSecurityPolicy()
.enforceTlsPolicy(
messageChannel
.getEncapsulatedClientTransaction());
} catch (SecurityException ex) {
throw new IOException(ex.getMessage());
}
if (sipStack.isLoggingEnabled()) {
this.sipStack.getStackLogger().logDebug(
"TLS Security policy passed");
}
OutputStream outputStream = clientSock
.getOutputStream();
writeChunks(outputStream, bytes, length);
putSocket(key, clientSock);
break;
} else {
try {
OutputStream outputStream = clientSock
.getOutputStream();
writeChunks(outputStream, bytes, length);
break;
} catch (IOException ex) {
if (sipStack.isLoggingEnabled())
sipStack.getStackLogger().logException(ex);
// old connection is bad.
// remove from our table.
removeSocket(key);
try {
clientSock.close();
} catch (Exception e) {
}
clientSock = null;
retry_count++;
}
}
}
} catch (SSLHandshakeException ex) {
removeSocket(key);
throw ex;
} catch (IOException ex) {
removeSocket(key);
throw ex;
} finally {
leaveIOCriticalSection(key);
}
if (clientSock == null) {
throw new IOException("Could not connect to " + receiverAddress
+ ":" + contactPort);
} else
return clientSock;
} else {
// This is a UDP transport...
DatagramSocket datagramSock = sipStack.getNetworkLayer()
.createDatagramSocket();
datagramSock.connect(receiverAddress, contactPort);
DatagramPacket dgPacket = new DatagramPacket(bytes, 0, length,
receiverAddress, contactPort);
datagramSock.send(dgPacket);
datagramSock.close();
return null;
}
}
/*
private void enterIOCriticalSection(String key) throws IOException {
try {
if ( ! this.ioSemaphore.tryAcquire(10,TimeUnit.SECONDS) ) {
throw new IOException("Could not acquire semaphore");
}
} catch (InterruptedException e) {
throw new IOException("exception in acquiring sem");
}
}
private void leaveIOCriticalSection(String key) {
this.ioSemaphore.release();
}
*/
private void leaveIOCriticalSection(String key) {
synchronized (socketCreationMap) {
Semaphore creationSemaphore = socketCreationMap.get(key);
if ( sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug("leaveIOCriticalSection : " + key);
}
if (creationSemaphore != null) {
creationSemaphore.release();
}
}
}
private void enterIOCriticalSection(String key) throws IOException {
Semaphore creationSemaphore = null;
if ( sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug("enterIOCriticalSection : " + key);
}
synchronized (socketCreationMap) {
creationSemaphore = socketCreationMap.get(key);
if (creationSemaphore == null) {
creationSemaphore = new Semaphore(1, true);
socketCreationMap.put(key, creationSemaphore);
}
}
try {
boolean retval = creationSemaphore.tryAcquire(10, TimeUnit.SECONDS);
if (!retval) {
throw new IOException("Could not acquire IO Semaphore'" + key
+ "' after 10 seconds -- giving up ");
}
} catch (InterruptedException e) {
throw new IOException("exception in acquiring sem");
}
}
/**
* Close all the cached connections.
*/
public void closeAll() {
for (Enumeration<Socket> values = socketTable.elements(); values
.hasMoreElements();) {
Socket s = (Socket) values.nextElement();
try {
s.close();
} catch (IOException ex) {
}
}
}
}