Create Socket helper
/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
* own identifying information: Portions Copyright [yyyy]
* [name of copyright owner]
*/
/*
* @(#)SocketFetcher.java 1.19 06/10/17
*
* Copyright 1998-2006 Sun Microsystems, Inc. All Rights Reserved.
*/
import java.security.*;
import java.net.*;
import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import javax.net.*;
import javax.net.ssl.*;
/**
* This class is used to get Sockets. Depending on the arguments passed it will
* either return a plain java.net.Socket or dynamically load the SocketFactory
* class specified in the classname param and return a socket created by that
* SocketFactory.
*
* @author Max Spivak
* @author Bill Shannon
*/
public class SocketFetcher {
// No one should instantiate this class.
private SocketFetcher() {
}
/**
* This method returns a Socket. Properties control the use of socket
* factories and other socket characteristics. The properties used are:
* <p>
* <ul>
* <li> <i>prefix</i>.socketFactory.class
* <li> <i>prefix</i>.socketFactory.fallback
* <li> <i>prefix</i>.socketFactory.port
* <li> <i>prefix</i>.timeout
* <li> <i>prefix</i>.connectiontimeout
* <li> <i>prefix</i>.localaddress
* <li> <i>prefix</i>.localport
* </ul>
* <p>
* If the socketFactory.class property isn't set, the socket returned is an
* instance of java.net.Socket connected to the given host and port. If the
* socketFactory.class property is set, it is expected to contain a fully
* qualified classname of a javax.net.SocketFactory subclass. In this case,
* the class is dynamically instantiated and a socket created by that
* SocketFactory is returned.
* <p>
*
* If the socketFactory.fallback property is set to false, don't fall back to
* using regular sockets if the socket factory fails.
* <p>
*
* The socketFactory.port specifies a port to use when connecting through the
* socket factory. If unset, the port argument will be used.
* <p>
*
* If the connectiontimeout property is set, we use a separate thread to make
* the connection so that we can timeout that connection attempt.
* <p>
*
* If the timeout property is set, it is used to set the socket timeout.
* <p>
*
* If the localaddress property is set, it's used as the local address to bind
* to. If the localport property is also set, it's used as the local port
* number to bind to.
*
* @param host
* The host to connect to
* @param port
* The port to connect to at the host
* @param props
* Properties object containing socket properties
* @param prefix
* Property name prefix, e.g., "mail.imap"
* @param useSSL
* use the SSL socket factory as the default
*/
public static Socket getSocket(String host, int port, Properties props, String prefix,
boolean useSSL) throws IOException {
if (prefix == null)
prefix = "socket";
if (props == null)
props = new Properties(); // empty
String s = props.getProperty(prefix + ".connectiontimeout", null);
int cto = -1;
if (s != null) {
try {
cto = Integer.parseInt(s);
} catch (NumberFormatException nfex) {
}
}
Socket socket = null;
String timeout = props.getProperty(prefix + ".timeout", null);
String localaddrstr = props.getProperty(prefix + ".localaddress", null);
InetAddress localaddr = null;
if (localaddrstr != null)
localaddr = InetAddress.getByName(localaddrstr);
String localportstr = props.getProperty(prefix + ".localport", null);
int localport = 0;
if (localportstr != null) {
try {
localport = Integer.parseInt(localportstr);
} catch (NumberFormatException nfex) {
}
}
boolean fb = false;
String fallback = props.getProperty(prefix + ".socketFactory.fallback", null);
fb = fallback == null || (!fallback.equalsIgnoreCase("false"));
String sfClass = props.getProperty(prefix + ".socketFactory.class", null);
int sfPort = -1;
try {
SocketFactory sf = getSocketFactory(sfClass);
if (sf != null) {
String sfPortStr = props.getProperty(prefix + ".socketFactory.port", null);
if (sfPortStr != null) {
try {
sfPort = Integer.parseInt(sfPortStr);
} catch (NumberFormatException nfex) {
}
}
// if port passed in via property isn't valid, use param
if (sfPort == -1)
sfPort = port;
socket = createSocket(localaddr, localport, host, sfPort, cto, sf, useSSL);
}
} catch (Exception ex) {
if (!fb) {
if (ex instanceof InvocationTargetException) {
Throwable t = ((InvocationTargetException) ex).getTargetException();
if (t instanceof Exception)
ex = (Exception) t;
}
if (ex instanceof IOException)
throw (IOException) ex;
IOException ioex = new IOException("Couldn't connect using \"" + sfClass
+ "\" socket factory to host, port: " + host + ", " + sfPort + "; Exception: " + ex);
throw ioex;
}
}
if (socket == null)
socket = createSocket(localaddr, localport, host, port, cto, null, useSSL);
int to = -1;
if (timeout != null) {
try {
to = Integer.parseInt(timeout);
} catch (NumberFormatException nfex) {
}
}
if (to >= 0)
socket.setSoTimeout(to);
configureSSLSocket(socket, props, prefix);
return socket;
}
public static Socket getSocket(String host, int port, Properties props, String prefix)
throws IOException {
return getSocket(host, port, props, prefix, false);
}
/**
* Create a socket with the given local address and connected to the given
* host and port. Use the specified connection timeout. If a socket factory is
* specified, use it. Otherwise, use the SSLSocketFactory if useSSL is true.
*/
private static Socket createSocket(InetAddress localaddr, int localport, String host, int port,
int cto, SocketFactory sf, boolean useSSL) throws IOException {
Socket socket;
if (sf != null)
socket = sf.createSocket(host, port);
else if (useSSL)
socket = SSLSocketFactory.getDefault().createSocket(host, port);
else
socket = new Socket(host, port);
/*
* if (localaddr != null) socket.bind(new InetAddress(localaddr,
* localport)); if (cto >= 0) socket.connect(new InetSocketAddress(host,
* port), cto); else socket.connect(new InetSocketAddress(host, port));
*/
return socket;
}
/**
* Return a socket factory of the specified class.
*/
private static SocketFactory getSocketFactory(String sfClass) throws ClassNotFoundException,
NoSuchMethodException, IllegalAccessException, InvocationTargetException {
if (sfClass == null || sfClass.length() == 0)
return null;
// dynamically load the class
ClassLoader cl = getContextClassLoader();
Class clsSockFact = null;
if (cl != null) {
try {
clsSockFact = cl.loadClass(sfClass);
} catch (ClassNotFoundException cex) {
}
}
if (clsSockFact == null)
clsSockFact = Class.forName(sfClass);
// get & invoke the getDefault() method
Method mthGetDefault = clsSockFact.getMethod("getDefault", new Class[] {});
SocketFactory sf = (SocketFactory) mthGetDefault.invoke(new Object(), new Object[] {});
return sf;
}
/**
* Start TLS on an existing socket. Supports the "STARTTLS" command in many
* protocols. This version for compatibility possible third party code that
* might've used this API even though it shouldn't.
*/
public static Socket startTLS(Socket socket) throws IOException {
return startTLS(socket, new Properties(), "socket");
}
/**
* Start TLS on an existing socket. Supports the "STARTTLS" command in many
* protocols.
*/
public static Socket startTLS(Socket socket, Properties props, String prefix) throws IOException {
InetAddress a = socket.getInetAddress();
String host = a.getHostName();
int port = socket.getPort();
// System.out.println("SocketFetcher: startTLS host " + host + ", port " +
// port);
try {
SSLSocketFactory ssf;
String sfClass = props.getProperty(prefix + ".socketFactory.class", null);
SocketFactory sf = getSocketFactory(sfClass);
if (sf != null && sf instanceof SSLSocketFactory)
ssf = (SSLSocketFactory) sf;
else
ssf = (SSLSocketFactory) SSLSocketFactory.getDefault();
socket = ssf.createSocket(socket, host, port, true);
configureSSLSocket(socket, props, prefix);
} catch (Exception ex) {
if (ex instanceof InvocationTargetException) {
Throwable t = ((InvocationTargetException) ex).getTargetException();
if (t instanceof Exception)
ex = (Exception) t;
}
if (ex instanceof IOException)
throw (IOException) ex;
// wrap anything else before sending it on
IOException ioex = new IOException("Exception in startTLS: host " + host + ", port " + port
+ "; Exception: " + ex);
throw ioex;
}
return socket;
}
/**
* Configure the SSL options for the socket (if it's an SSL socket), based on
* the mail.<protocol>.ssl.protocols and mail.<protocol>.ssl.ciphersuites
* properties.
*/
private static void configureSSLSocket(Socket socket, Properties props, String prefix) {
if (!(socket instanceof SSLSocket))
return;
SSLSocket sslsocket = (SSLSocket) socket;
String protocols = props.getProperty(prefix + ".ssl.protocols", null);
// if (protocols != null)
// sslsocket.setEnabledProtocols(stringArray(protocols));
// else {
// /*
// * At least the UW IMAP server insists on only the TLSv1
// * protocol for STARTTLS, and won't accept the old SSLv2
// * or SSLv3 protocols. Here we enable only the TLSv1
// * protocol. XXX - this should probably be parameterized.
// */
// sslsocket.setEnabledProtocols(new String[] {"TLSv1"});
// }
String ciphers = props.getProperty(prefix + ".ssl.ciphersuites", null);
if (ciphers != null)
sslsocket.setEnabledCipherSuites(stringArray(ciphers));
/*
* System.out.println("SSL protocols after " +
* Arrays.asList(sslsocket.getEnabledProtocols())); System.out.println("SSL
* ciphers after " + Arrays.asList(sslsocket.getEnabledCipherSuites()));
*/
}
/**
* Parse a string into whitespace separated tokens and return the tokens in an
* array.
*/
private static String[] stringArray(String s) {
StringTokenizer st = new StringTokenizer(s);
List tokens = new ArrayList();
while (st.hasMoreTokens())
tokens.add(st.nextToken());
return (String[]) tokens.toArray(new String[tokens.size()]);
}
/**
* Convenience method to get our context class loader. Assert any privileges
* we might have and then call the Thread.getContextClassLoader method.
*/
private static ClassLoader getContextClassLoader() {
return (ClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
ClassLoader cl = null;
try {
cl = Thread.currentThread().getContextClassLoader();
} catch (SecurityException ex) {
}
return cl;
}
});
}
}
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