Mega Code Archive
Socket Fetcher
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/*
* @(#)SocketFetcher.java 1.20 07/05/04
*/
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 (SocketTimeoutException sex) {
throw sex;
} 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);
ioex.initCause(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();
else if (useSSL)
socket = SSLSocketFactory.getDefault().createSocket();
else
socket = new Socket();
if (localaddr != null)
socket.bind(new InetSocketAddress(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);
ioex.initCause(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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