first commit of new OrbotVPN integration into Orbot

.gitmodules

@@ -29,3 +29,6 @@
 [submodule "external/polipo"]
 	path = external/polipo
 	url = https://github.com/jech/polipo.git
+[submodule "external/badvpn"]
+	path = external/badvpn
+	url = https://github.com/ambrop72/badvpn.git

AndroidManifest.xml

@@ -101,6 +101,14 @@
 				<action	android:name="android.intent.action.BOOT_COMPLETED" />
 			</intent-filter>
 		</receiver>
+		
+    	
+        <service android:name="org.torproject.android.vpn.OrbotVpnService"
+                android:permission="android.permission.BIND_VPN_SERVICE">
+            <intent-filter>
+                <action android:name="android.net.VpnService"/>
+            </intent-filter>
+        </service>
     	
     </application>
     

external/badvpn

@@ -0,0 +1 @@
+Subproject commit 5153894f4375d7a0e43d0b60c1b759543e6b383a

external/tor

@@ -1 +1 @@
-Subproject commit 40233cadbbbf77214913db818a1458c6ddd14a9f
+Subproject commit a64f3ab3ee5c433cc1f046a7e26df7a49e308e4c

res/menu/main.xml

@@ -73,6 +73,9 @@
          
          />
   
+  <item android:id="@+id/menu_vpn"
+      android:title="start VPN"
+      yourapp:showAsAction="never"/>
    <!-- 
   <item android:id="@+id/menu_diag"
         android:title="Test Mode"

src/com/runjva/sourceforge/jsocks/main/SOCKS.java

@@ -0,0 +1,269 @@
+package com.runjva.sourceforge.jsocks.main;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.Hashtable;
+import java.util.Properties;
+import java.util.StringTokenizer;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.runjva.sourceforge.jsocks.protocol.InetRange;
+import com.runjva.sourceforge.jsocks.protocol.ProxyServer;
+import com.runjva.sourceforge.jsocks.protocol.SocksProxyBase;
+import com.runjva.sourceforge.jsocks.server.IdentAuthenticator;
+
+public class SOCKS {
+
+	private static final int DEFAULT_LISTENING_PORT = 1080;
+	final private static Logger log = LoggerFactory.getLogger(SOCKS.class);
+
+	static public void usage() {
+		System.out.println("Usage: java SOCKS [inifile1 inifile2 ...]\n"
+				+ "If none inifile is given, uses socks.properties.\n");
+	}
+
+	static public void main(String[] args) {
+
+		String[] file_names;
+		int port = DEFAULT_LISTENING_PORT;
+		String logFile = null;
+		String host = null;
+
+		final IdentAuthenticator auth = new IdentAuthenticator();
+
+		InetAddress localIP = null;
+
+		if (args.length == 0) {
+			file_names = new String[] { "socks.properties" };
+		} else {
+			file_names = args;
+		}
+
+		inform("Loading properties");
+		for (int i = 0; i < file_names.length; ++i) {
+
+			inform("Reading file " + file_names[i]);
+
+			final Properties pr = loadProperties(file_names[i]);
+			if (pr == null) {
+				System.err.println("Loading of properties from "
+						+ file_names[i] + "failed.");
+				usage();
+				return;
+			}
+			if (!addAuth(auth, pr)) {
+				System.err.println("Error in file " + file_names[i] + ".");
+				usage();
+				return;
+			}
+			// First file should contain all global settings,
+			// like port and host and log.
+			if (i == 0) {
+				final String port_s = (String) pr.get("port");
+				if (port_s != null) {
+					try {
+						port = Integer.parseInt(port_s);
+					} catch (final NumberFormatException nfe) {
+						System.err.println("Can't parse port: " + port_s);
+						return;
+					}
+				}
+
+				serverInit(pr);
+				logFile = (String) pr.get("log");
+				host = (String) pr.get("host");
+			}
+
+			// inform("Props:"+pr);
+		}
+
+		if (logFile != null) {
+			System.err.println("log property not supported anymore.");
+		}
+		if (host != null) {
+			try {
+				localIP = InetAddress.getByName(host);
+			} catch (final UnknownHostException uhe) {
+				System.err.println("Can't resolve local ip: " + host);
+				return;
+			}
+		}
+
+		inform("Using Ident Authentication scheme: " + auth);
+		final ProxyServer server = new ProxyServer(auth);
+		server.start(port, 5, localIP);
+	}
+
+	static Properties loadProperties(String file_name) {
+
+		final Properties pr = new Properties();
+
+		try {
+			final InputStream fin = new FileInputStream(file_name);
+			pr.load(fin);
+			fin.close();
+		} catch (final IOException ioe) {
+			return null;
+		}
+		return pr;
+	}
+
+	static boolean addAuth(IdentAuthenticator ident, Properties pr) {
+
+		InetRange irange;
+
+		final String range = (String) pr.get("range");
+		if (range == null) {
+			return false;
+		}
+		irange = parseInetRange(range);
+
+		final String users = (String) pr.get("users");
+
+		if (users == null) {
+			ident.add(irange, null);
+			return true;
+		}
+
+		final Hashtable<String, String> uhash = new Hashtable<String, String>();
+
+		final StringTokenizer st = new StringTokenizer(users, ";");
+		while (st.hasMoreTokens()) {
+			uhash.put(st.nextToken(), "");
+		}
+
+		ident.add(irange, uhash);
+		return true;
+	}
+
+	/**
+	 * Does server initialisation.
+	 */
+	static void serverInit(Properties props) {
+		int val;
+		val = readInt(props, "iddleTimeout");
+		if (val >= 0) {
+			ProxyServer.setIddleTimeout(val);
+			inform("Setting iddle timeout to " + val + " ms.");
+		}
+		val = readInt(props, "acceptTimeout");
+		if (val >= 0) {
+			ProxyServer.setAcceptTimeout(val);
+			inform("Setting accept timeout to " + val + " ms.");
+		}
+		val = readInt(props, "udpTimeout");
+		if (val >= 0) {
+			ProxyServer.setUDPTimeout(val);
+			inform("Setting udp timeout to " + val + " ms.");
+		}
+
+		val = readInt(props, "datagramSize");
+		if (val >= 0) {
+			ProxyServer.setDatagramSize(val);
+			inform("Setting datagram size to " + val + " bytes.");
+		}
+
+		proxyInit(props);
+
+	}
+
+	/**
+	 * Initialises proxy, if any specified.
+	 */
+	static void proxyInit(Properties props) {
+		String proxy_list;
+		SocksProxyBase proxy = null;
+		StringTokenizer st;
+
+		proxy_list = (String) props.get("proxy");
+		if (proxy_list == null) {
+			return;
+		}
+
+		st = new StringTokenizer(proxy_list, ";");
+		while (st.hasMoreTokens()) {
+			final String proxy_entry = st.nextToken();
+
+			final SocksProxyBase p = SocksProxyBase.parseProxy(proxy_entry);
+
+			if (p == null) {
+				exit("Can't parse proxy entry:" + proxy_entry);
+			}
+
+			inform("Adding Proxy:" + p);
+
+			if (proxy != null) {
+				p.setChainProxy(proxy);
+			}
+
+			proxy = p;
+
+		}
+		if (proxy == null) {
+			return; // Empty list
+		}
+
+		final String direct_hosts = (String) props.get("directHosts");
+		if (direct_hosts != null) {
+			final InetRange ir = parseInetRange(direct_hosts);
+			inform("Setting direct hosts:" + ir);
+			proxy.setDirect(ir);
+		}
+
+		ProxyServer.setProxy(proxy);
+	}
+
+	/**
+	 * Inits range from the string of semicolon separated ranges.
+	 */
+	static InetRange parseInetRange(String source) {
+		final InetRange irange = new InetRange();
+
+		final StringTokenizer st = new StringTokenizer(source, ";");
+		while (st.hasMoreTokens()) {
+			irange.add(st.nextToken());
+		}
+
+		return irange;
+	}
+
+	/**
+	 * Integer representaion of the property named name, or -1 if one is not
+	 * found.
+	 */
+	static int readInt(Properties props, String name) {
+		int result = -1;
+		final String val = (String) props.get(name);
+		if (val == null) {
+			return -1;
+		}
+		final StringTokenizer st = new StringTokenizer(val);
+		if (!st.hasMoreElements()) {
+			return -1;
+		}
+		try {
+			result = Integer.parseInt(st.nextToken());
+		} catch (final NumberFormatException nfe) {
+			inform("Bad value for " + name + ":" + val);
+		}
+		return result;
+	}
+
+	// Display functions
+	// /////////////////
+
+	static void inform(String s) {
+		log.info(s);
+	}
+
+	static void exit(String msg) {
+		System.err.println("Error:" + msg);
+		System.err.println("Aborting operation");
+		System.exit(0);
+	}
+}

src/com/runjva/sourceforge/jsocks/protocol/Authentication.java

@@ -0,0 +1,35 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+/**
+ * The Authentication interface provides for performing method specific
+ * authentication for SOCKS5 connections.
+ */
+public interface Authentication {
+	/**
+	 * This method is called when SOCKS5 server have selected a particular
+	 * authentication method, for whch an implementaion have been registered.
+	 * 
+	 * <p>
+	 * This method should return an array {inputstream,outputstream
+	 * [,UDPEncapsulation]}. The reason for that is that SOCKS5 protocol allows
+	 * to have method specific encapsulation of data on the socket for purposes
+	 * of integrity or security. And this encapsulation should be performed by
+	 * those streams returned from the method. It is also possible to
+	 * encapsulate datagrams. If authentication method supports such
+	 * encapsulation an instance of the UDPEncapsulation interface should be
+	 * returned as third element of the array, otherwise either null should be
+	 * returned as third element, or array should contain only 2 elements.
+	 * 
+	 * @param methodId
+	 *            Authentication method selected by the server.
+	 * @param proxySocket
+	 *            Socket used to conect to the proxy.
+	 * @return Two or three element array containing Input/Output streams which
+	 *         should be used on this connection. Third argument is optional and
+	 *         should contain an instance of UDPEncapsulation. It should be
+	 *         provided if the authentication method used requires any
+	 *         encapsulation to be done on the datagrams.
+	 */
+	Object[] doSocksAuthentication(int methodId, java.net.Socket proxySocket)
+			throws java.io.IOException;
+}

src/com/runjva/sourceforge/jsocks/protocol/AuthenticationNone.java

@@ -0,0 +1,22 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/**
+ * SOCKS5 none authentication. Dummy class does almost nothing.
+ */
+public class AuthenticationNone implements Authentication {
+
+	public Object[] doSocksAuthentication(final int methodId,
+			final java.net.Socket proxySocket) throws java.io.IOException {
+
+		if (methodId != 0) {
+			return null;
+		}
+
+		InputStream in = proxySocket.getInputStream();
+		OutputStream out = proxySocket.getOutputStream();
+		return new Object[] { in, out };
+	}
+}

src/com/runjva/sourceforge/jsocks/protocol/InetRange.java

@@ -0,0 +1,492 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.Enumeration;
+import java.util.Hashtable;
+import java.util.StringTokenizer;
+import java.util.Vector;
+
+/**
+ * Class InetRange provides the means of defining the range of inetaddresses.
+ * It's used by Proxy class to store and look up addresses of machines, that
+ * should be contacted directly rather then through the proxy.
+ * <P>
+ * InetRange provides several methods to add either standalone addresses, or
+ * ranges (e.g. 100.200.300.0:100.200.300.255, which covers all addresses on on
+ * someones local network). It also provides methods for checking wether given
+ * address is in this range. Any number of ranges and standalone addresses can
+ * be added to the range.
+ */
+public class InetRange implements Cloneable {
+
+	Hashtable<String, Object[]> host_names;
+	Vector<Object[]> all;
+	Vector<String> end_names;
+
+	boolean useSeparateThread = true;
+
+	/**
+	 * Creates the empty range.
+	 */
+	public InetRange() {
+		all = new Vector<Object[]>();
+		host_names = new Hashtable<String, Object[]>();
+		end_names = new Vector<String>();
+	}
+
+	/**
+	 * Adds another host or range to this range. The String can be one of those:
+	 * <UL>
+	 * <li>Host name. eg.(Athena.myhost.com or 45.54.56.65)
+	 * 
+	 * <li>Range in the form .myhost.net.au <BR>
+	 * In which case anything that ends with .myhost.net.au will be considered
+	 * in the range.
+	 * 
+	 * <li>Range in the form ddd.ddd.ddd. <BR>
+	 * This will be treated as range ddd.ddd.ddd.0 to ddd.ddd.ddd.255. It is not
+	 * necessary to specify 3 first bytes you can use just one or two. For
+	 * example 130. will cover address between 130.0.0.0 and 13.255.255.255.
+	 * 
+	 * <li>Range in the form host_from[: \t\n\r\f]host_to. <br>
+	 * That is two hostnames or ips separated by either whitespace or colon.
+	 * </UL>
+	 */
+	public synchronized boolean add(final String s0) {
+		if (s0 == null) {
+			return false;
+		}
+
+		String s = s0.trim();
+		if (s.length() == 0) {
+			return false;
+		}
+
+		Object[] entry;
+
+		if (s.endsWith(".")) {
+			// thing like: 111.222.33.
+			// it is being treated as range 111.222.33.000 - 111.222.33.255
+
+			final int[] addr = ip2intarray(s);
+			long from, to;
+			from = to = 0;
+
+			if (addr == null) {
+				return false;
+			}
+			for (int i = 0; i < 4; i++) {
+				if (addr[i] >= 0) {
+					from += (((long) addr[i]) << 8 * (3 - i));
+				} else {
+					to = from;
+					while (i < 4) {
+						to += 255l << 8 * (3 - i++);
+					}
+					break;
+				}
+			}
+			entry = new Object[] { s, null, new Long(from), new Long(to) };
+			all.addElement(entry);
+
+		} else if (s.startsWith(".")) {
+			// Thing like: .myhost.com
+
+			end_names.addElement(s);
+			all.addElement(new Object[] { s, null, null, null });
+		} else {
+			final StringTokenizer tokens = new StringTokenizer(s, " \t\r\n\f:");
+			if (tokens.countTokens() > 1) {
+				entry = new Object[] { s, null, null, null };
+				resolve(entry, tokens.nextToken(), tokens.nextToken());
+				all.addElement(entry);
+			} else {
+				entry = new Object[] { s, null, null, null };
+				all.addElement(entry);
+				host_names.put(s, entry);
+				resolve(entry);
+			}
+
+		}
+
+		return true;
+	}
+
+	/**
+	 * Adds another ip for this range.
+	 * 
+	 * @param ip
+	 *            IP os the host which should be added to this range.
+	 */
+	public synchronized void add(final InetAddress ip) {
+		long from, to;
+		from = to = ip2long(ip);
+		all.addElement(new Object[] { ip.getHostName(), ip, new Long(from),
+				new Long(to) });
+	}
+
+	/**
+	 * Adds another range of ips for this range.Any host with ip address greater
+	 * than or equal to the address of from and smaller than or equal to the
+	 * address of to will be included in the range.
+	 * 
+	 * @param from
+	 *            IP from where range starts(including).
+	 * @param to
+	 *            IP where range ends(including).
+	 */
+	public synchronized void add(final InetAddress from, final InetAddress to) {
+		all.addElement(new Object[] {
+				from.getHostAddress() + ":" + to.getHostAddress(), null,
+				new Long(ip2long(from)), new Long(ip2long(to)) });
+	}
+
+	/**
+	 * Checks wether the givan host is in the range. Attempts to resolve host
+	 * name if required.
+	 * 
+	 * @param host
+	 *            Host name to check.
+	 * @return true If host is in the range, false otherwise.
+	 * @see InetRange#contains(String,boolean)
+	 */
+	public synchronized boolean contains(final String host) {
+		return contains(host, true);
+	}
+
+	/**
+	 * Checks wether the given host is in the range.
+	 * <P>
+	 * Algorithm: <BR>
+	 * <ol>
+	 * <li>Look up if the hostname is in the range (in the Hashtable).
+	 * <li>Check if it ends with one of the speciefied endings.
+	 * <li>Check if it is ip(eg.130.220.35.98). If it is check if it is in the
+	 * range.
+	 * <li>If attemptResolve is true, host is name, rather than ip, and all
+	 * previous attempts failed, try to resolve the hostname, and check wether
+	 * the ip associated with the host is in the range.It also repeats all
+	 * previos steps with the hostname obtained from InetAddress, but the name
+	 * is not allways the full name,it is quite likely to be the same. Well it
+	 * was on my machine.
+	 * </ol>
+	 * 
+	 * @param host
+	 *            Host name to check.
+	 * @param attemptResolve
+	 *            Wether to lookup ip address which corresponds to the host,if
+	 *            required.
+	 * @return true If host is in the range, false otherwise.
+	 */
+	public synchronized boolean contains(final String host0,
+			final boolean attemptResolve) {
+		if (all.size() == 0) {
+			return false; // Empty range
+		}
+
+		String host = host0.trim();
+		if (host.length() == 0) {
+			return false;
+		}
+
+		if (checkHost(host)) {
+			return true;
+		}
+		if (checkHostEnding(host)) {
+			return true;
+		}
+
+		final long l = host2long(host);
+		if (l >= 0) {
+			return contains(l);
+		}
+
+		if (!attemptResolve) {
+			return false;
+		}
+
+		try {
+			final InetAddress ip = InetAddress.getByName(host);
+			return contains(ip);
+		} catch (final UnknownHostException uhe) {
+
+		}
+
+		return false;
+	}
+
+	/**
+	 * Checks wether the given ip is in the range.
+	 * 
+	 * @param ip
+	 *            Address of the host to check.
+	 * @return true If host is in the range, false otherwise.
+	 */
+	public synchronized boolean contains(final InetAddress ip) {
+		if (checkHostEnding(ip.getHostName())) {
+			return true;
+		}
+		if (checkHost(ip.getHostName())) {
+			return true;
+		}
+		return contains(ip2long(ip));
+	}
+
+	/**
+	 * Get all entries in the range as strings. <BR>
+	 * These strings can be used to delete entries from the range with remove
+	 * function.
+	 * 
+	 * @return Array of entries as strings.
+	 * @see InetRange#remove(String)
+	 */
+	public synchronized String[] getAll() {
+		final int size = all.size();
+		Object entry[];
+		final String all_names[] = new String[size];
+
+		for (int i = 0; i < size; ++i) {
+			entry = all.elementAt(i);
+			all_names[i] = (String) entry[0];
+		}
+		return all_names;
+	}
+
+	/**
+	 * Removes an entry from this range.<BR>
+	 * 
+	 * @param s
+	 *            Entry to remove.
+	 * @return true if successfull.
+	 */
+	public synchronized boolean remove(final String s) {
+		final Enumeration<Object[]> enumx = all.elements();
+		while (enumx.hasMoreElements()) {
+			final Object[] entry = enumx.nextElement();
+			if (s.equals(entry[0])) {
+				all.removeElement(entry);
+				end_names.removeElement(s);
+				host_names.remove(s);
+				return true;
+			}
+		}
+		return false;
+	}
+
+	/** Get string representaion of this Range. */
+	public String toString() {
+		final String all[] = getAll();
+		if (all.length == 0) {
+			return "";
+		}
+
+		String s = all[0];
+		for (int i = 1; i < all.length; ++i) {
+			s += "; " + all[i];
+		}
+		return s;
+	}
+
+	/** Creates a clone of this Object */
+
+	@SuppressWarnings("unchecked")
+	public Object clone() {
+		final InetRange new_range = new InetRange();
+		new_range.all = (Vector<Object[]>) all.clone();
+		new_range.end_names = (Vector<String>) end_names.clone();
+		new_range.host_names = (Hashtable<String, Object[]>) host_names.clone();
+		return new_range;
+	}
+
+	// Private methods
+	// ///////////////
+	/**
+	 * Same as previous but used internally, to avoid unnecessary convertion of
+	 * IPs, when checking subranges
+	 */
+	private synchronized boolean contains(final long ip) {
+		final Enumeration<Object[]> enumx = all.elements();
+		while (enumx.hasMoreElements()) {
+			final Object[] obj = enumx.nextElement();
+			final Long from = obj[2] == null ? null : (Long) obj[2];
+			final Long to = obj[3] == null ? null : (Long) obj[3];
+			if ((from != null) && (from.longValue() <= ip)
+					&& (to.longValue() >= ip)) {
+				return true;
+			}
+
+		}
+		return false;
+	}
+
+	private boolean checkHost(final String host) {
+		return host_names.containsKey(host);
+	}
+
+	private boolean checkHostEnding(final String host) {
+		final Enumeration<String> enumx = end_names.elements();
+		while (enumx.hasMoreElements()) {
+			if (host.endsWith(enumx.nextElement())) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	private void resolve(final Object[] entry) {
+		// First check if it's in the form ddd.ddd.ddd.ddd.
+		final long ip = host2long((String) entry[0]);
+		if (ip >= 0) {
+			entry[2] = entry[3] = new Long(ip);
+		} else {
+			final InetRangeResolver res = new InetRangeResolver(entry);
+			res.resolve(useSeparateThread);
+		}
+	}
+
+	private void resolve(final Object[] entry, final String from,
+			final String to) {
+		long f, t;
+		if (((f = host2long(from)) >= 0) && ((t = host2long(to)) >= 0)) {
+			entry[2] = new Long(f);
+			entry[3] = new Long(t);
+		} else {
+			final InetRangeResolver res = new InetRangeResolver(entry, from, to);
+			res.resolve(useSeparateThread);
+		}
+	}
+
+	// Class methods
+	// /////////////
+
+	// Converts ipv4 to long value(unsigned int)
+	// /////////////////////////////////////////
+	static long ip2long(final InetAddress ip) {
+		long l = 0;
+		final byte[] addr = ip.getAddress();
+
+		if (addr.length == 4) { // IPV4
+			for (int i = 0; i < 4; ++i) {
+				l += (((long) addr[i] & 0xFF) << 8 * (3 - i));
+			}
+		} else { // IPV6
+			return 0; // Have no idea how to deal with those
+		}
+		return l;
+	}
+
+	long host2long(final String host) {
+		long ip = 0;
+
+		// check if it's ddd.ddd.ddd.ddd
+		if (!Character.isDigit(host.charAt(0))) {
+			return -1;
+		}
+
+		final int[] addr = ip2intarray(host);
+		if (addr == null) {
+			return -1;
+		}
+
+		for (int i = 0; i < addr.length; ++i) {
+			ip += ((long) (addr[i] >= 0 ? addr[i] : 0)) << 8 * (3 - i);
+		}
+
+		return ip;
+	}
+
+	static int[] ip2intarray(final String host) {
+		final int[] address = { -1, -1, -1, -1 };
+		int i = 0;
+		final StringTokenizer tokens = new StringTokenizer(host, ".");
+		if (tokens.countTokens() > 4) {
+			return null;
+		}
+		while (tokens.hasMoreTokens()) {
+			try {
+				address[i++] = Integer.parseInt(tokens.nextToken()) & 0xFF;
+			} catch (final NumberFormatException nfe) {
+				return null;
+			}
+
+		}
+		return address;
+	}
+
+	/*
+	 * //* This was the test main function //**********************************
+	 * 
+	 * public static void main(String args[])throws UnknownHostException{ int i;
+	 * 
+	 * InetRange ir = new InetRange();
+	 * 
+	 * 
+	 * for(i=0;i<args.length;++i){ System.out.println("Adding:" + args[i]);
+	 * ir.add(args[i]); }
+	 * 
+	 * String host; java.io.DataInputStream din = new
+	 * java.io.DataInputStream(System.in); try{ host = din.readLine();
+	 * while(host!=null){ if(ir.contains(host)){
+	 * System.out.println("Range contains ip:"+host); }else{
+	 * System.out.println(host+" is not in the range"); } host = din.readLine();
+	 * } }catch(java.io.IOException io_ex){ io_ex.printStackTrace(); } }
+	 * ******************
+	 */
+
+}
+
+class InetRangeResolver implements Runnable {
+
+	Object[] entry;
+
+	String from;
+	String to;
+
+	InetRangeResolver(final Object[] entry) {
+		this.entry = entry;
+		from = null;
+		to = null;
+	}
+
+	InetRangeResolver(final Object[] entry, final String from, final String to) {
+		this.entry = entry;
+		this.from = from;
+		this.to = to;
+	}
+
+	public final void resolve() {
+		resolve(true);
+	}
+
+	public final void resolve(final boolean inSeparateThread) {
+		if (inSeparateThread) {
+			final Thread t = new Thread(this);
+			t.start();
+		} else {
+			run();
+		}
+
+	}
+
+	public void run() {
+		try {
+			if (from == null) {
+				final InetAddress ip = InetAddress.getByName((String) entry[0]);
+				entry[1] = ip;
+				final Long l = new Long(InetRange.ip2long(ip));
+				entry[2] = l;
+				entry[3] = l;
+			} else {
+				final InetAddress f = InetAddress.getByName(from);
+				final InetAddress t = InetAddress.getByName(to);
+				entry[2] = new Long(InetRange.ip2long(f));
+				entry[3] = new Long(InetRange.ip2long(t));
+
+			}
+		} catch (final UnknownHostException uhe) {
+			// System.err.println("Resolve failed for "+from+','+to+','+entry[0]);
+		}
+	}
+
+}

src/com/runjva/sourceforge/jsocks/protocol/ProxyMessage.java

@@ -0,0 +1,118 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+/**
+ * Abstract class which describes SOCKS4/5 response/request.
+ */
+public abstract class ProxyMessage {
+
+	/** Host as an IP address */
+	public InetAddress ip = null;
+
+	/** SOCKS version, or version of the response for SOCKS4 */
+	public int version;
+
+	/** Port field of the request/response */
+	public int port;
+
+	/** Request/response code as an int */
+	public int command;
+
+	/** Host as string. */
+	public String host = null;
+
+	/** User field for SOCKS4 request messages */
+	public String user = null;
+
+	ProxyMessage(int command, InetAddress ip, int port) {
+		this.command = command;
+		this.ip = ip;
+		this.port = port;
+	}
+
+	ProxyMessage() {
+	}
+
+	/**
+	 * Initialises Message from the stream. Reads server response from given
+	 * stream.
+	 * 
+	 * @param in
+	 *            Input stream to read response from.
+	 * @throws SocksException
+	 *             If server response code is not SOCKS_SUCCESS(0), or if any
+	 *             error with protocol occurs.
+	 * @throws IOException
+	 *             If any error happens with I/O.
+	 */
+	public abstract void read(InputStream in) throws SocksException,
+			IOException;
+
+	/**
+	 * Initialises Message from the stream. Reads server response or client
+	 * request from given stream.
+	 * 
+	 * @param in
+	 *            Input stream to read response from.
+	 * @param clinetMode
+	 *            If true read server response, else read client request.
+	 * @throws SocksException
+	 *             If server response code is not SOCKS_SUCCESS(0) and reading
+	 *             in client mode, or if any error with protocol occurs.
+	 * @throws IOException
+	 *             If any error happens with I/O.
+	 */
+	public abstract void read(InputStream in, boolean client_mode)
+			throws SocksException, IOException;
+
+	/**
+	 * Writes the message to the stream.
+	 * 
+	 * @param out
+	 *            Output stream to which message should be written.
+	 */
+	public abstract void write(OutputStream out) throws SocksException,
+			IOException;
+
+	/**
+	 * Get the Address field of this message as InetAddress object.
+	 * 
+	 * @return Host address or null, if one can't be determined.
+	 */
+	public InetAddress getInetAddress() throws UnknownHostException {
+		return ip;
+	}
+
+	/**
+	 * Get string representaion of this message.
+	 * 
+	 * @return string representation of this message.
+	 */
+	public String toString() {
+		return "Proxy Message:\n" + "Version:" + version + "\n" + "Command:"
+				+ command + "\n" + "IP:     " + ip + "\n" + "Port:   " + port
+				+ "\n" + "User:   " + user + "\n";
+	}
+
+	// Package methods
+	// ////////////////
+
+	static final String bytes2IPV4(byte[] addr, int offset) {
+		String hostName = "" + (addr[offset] & 0xFF);
+		for (int i = offset + 1; i < offset + 4; i++) {
+			hostName += "." + (addr[i] & 0xFF);
+		}
+		return hostName;
+	}
+
+	static final String bytes2IPV6(byte[] addr, int offset) {
+		// Have no idea how they look like!
+		return null;
+	}
+
+}

src/com/runjva/sourceforge/jsocks/protocol/ProxyServer.java

@@ -0,0 +1,669 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.EOFException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InterruptedIOException;
+import java.io.OutputStream;
+import java.io.PushbackInputStream;
+import java.net.ConnectException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.NoRouteToHostException;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.nio.channels.SocketChannel;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import android.net.VpnService;
+
+import com.runjva.sourceforge.jsocks.server.ServerAuthenticator;
+
+/**
+ * SOCKS4 and SOCKS5 proxy, handles both protocols simultaniously. Implements
+ * all SOCKS commands, including UDP relaying.
+ * <p>
+ * In order to use it you will need to implement ServerAuthenticator interface.
+ * There is an implementation of this interface which does no authentication
+ * ServerAuthenticatorNone, but it is very dangerous to use, as it will give
+ * access to your local network to anybody in the world. One should never use
+ * this authentication scheme unless one have pretty good reason to do so. There
+ * is a couple of other authentication schemes in socks.server package.
+ * 
+ * @see socks.server.ServerAuthenticator
+ */
+public class ProxyServer implements Runnable {
+
+	ServerAuthenticator auth;
+	ProxyMessage msg = null;
+
+	Socket sock = null, remote_sock = null;
+	ServerSocket ss = null;
+	UDPRelayServer relayServer = null;
+	InputStream in, remote_in;
+	OutputStream out, remote_out;
+
+	int mode;
+	static final int START_MODE = 0;
+	static final int ACCEPT_MODE = 1;
+	static final int PIPE_MODE = 2;
+	static final int ABORT_MODE = 3;
+
+	static final int BUF_SIZE = 8192;
+
+	Thread pipe_thread1, pipe_thread2;
+	long lastReadTime;
+
+	static int iddleTimeout = 180000; // 3 minutes
+	static int acceptTimeout = 180000; // 3 minutes
+
+	static Logger log = LoggerFactory.getLogger(ProxyServer.class);
+	static SocksProxyBase proxy;
+
+	static VpnService vpnService;
+	
+	// Public Constructors
+	// ///////////////////
+
+	/**
+	 * Creates a proxy server with given Authentication scheme.
+	 * 
+	 * @param auth
+	 *            Authentication scheme to be used.
+	 */
+	public ProxyServer(final ServerAuthenticator auth) {
+		this.auth = auth;
+	}
+
+	// Other constructors
+	// //////////////////
+
+	ProxyServer(final ServerAuthenticator auth, final Socket s) {
+		this.auth = auth;
+		this.sock = s;
+		this.mode = START_MODE;
+	}
+
+	// Public methods
+	// ///////////////
+
+	/**
+	 * Set proxy.
+	 * <p>
+	 * Allows Proxy chaining so that one Proxy server is connected to another
+	 * and so on. If proxy supports SOCKSv4, then only some SOCKSv5 requests can
+	 * be handled, UDP would not work, however CONNECT and BIND will be
+	 * translated.
+	 * 
+	 * @param p
+	 *            Proxy which should be used to handle user requests.
+	 */
+	public static void setProxy(final SocksProxyBase p) {
+		proxy = p;
+		// FIXME: Side effect.
+		UDPRelayServer.proxy = proxy;
+	}
+
+	public static void setVpnService (final VpnService v)
+	{
+		vpnService = v;
+	}
+	/**
+	 * Get proxy.
+	 * 
+	 * @return Proxy wich is used to handle user requests.
+	 */
+	public static SocksProxyBase getProxy() {
+		return proxy;
+	}
+
+	/**
+	 * Sets the timeout for connections, how long shoud server wait for data to
+	 * arrive before dropping the connection.<br>
+	 * Zero timeout implies infinity.<br>
+	 * Default timeout is 3 minutes.
+	 */
+	public static void setIddleTimeout(final int timeout) {
+		iddleTimeout = timeout;
+	}
+
+	/**
+	 * Sets the timeout for BIND command, how long the server should wait for
+	 * the incoming connection.<br>
+	 * Zero timeout implies infinity.<br>
+	 * Default timeout is 3 minutes.
+	 */
+	public static void setAcceptTimeout(final int timeout) {
+		acceptTimeout = timeout;
+	}
+
+	/**
+	 * Sets the timeout for UDPRelay server.<br>
+	 * Zero timeout implies infinity.<br>
+	 * Default timeout is 3 minutes.
+	 */
+	public static void setUDPTimeout(final int timeout) {
+		UDPRelayServer.setTimeout(timeout);
+	}
+
+	/**
+	 * Sets the size of the datagrams used in the UDPRelayServer.<br>
+	 * Default size is 64K, a bit more than maximum possible size of the
+	 * datagram.
+	 */
+	public static void setDatagramSize(final int size) {
+		UDPRelayServer.setDatagramSize(size);
+	}
+
+	/**
+	 * Start the Proxy server at given port.<br>
+	 * This methods blocks.
+	 */
+	public void start(final int port) {
+		start(port, 5, null);
+	}
+
+	/**
+	 * Create a server with the specified port, listen backlog, and local IP
+	 * address to bind to. The localIP argument can be used on a multi-homed
+	 * host for a ServerSocket that will only accept connect requests to one of
+	 * its addresses. If localIP is null, it will default accepting connections
+	 * on any/all local addresses. The port must be between 0 and 65535,
+	 * inclusive. <br>
+	 * This methods blocks.
+	 */
+	public void start(final int port, final int backlog,
+			final InetAddress localIP) {
+		try {
+			ss = new ServerSocket(port, backlog, localIP);
+			final String address = ss.getInetAddress().getHostAddress();
+			final int localPort = ss.getLocalPort();
+			log.info("Starting SOCKS Proxy on: {}:{}", address, localPort);
+
+			while (true) {
+				final Socket s = ss.accept();
+				final String hostName = s.getInetAddress().getHostName();
+				final int port2 = s.getPort();
+				log.info("Accepted from:{}:{}", hostName, port2);
+
+				final ProxyServer ps = new ProxyServer(auth, s);
+				(new Thread(ps)).start();
+			}
+		} catch (final IOException ioe) {
+			ioe.printStackTrace();
+		} finally {
+		}
+	}
+
+	/**
+	 * Stop server operation.It would be wise to interrupt thread running the
+	 * server afterwards.
+	 */
+	public void stop() {
+		try {
+			if (ss != null) {
+				ss.close();
+			}
+		} catch (final IOException ioe) {
+		}
+	}
+
+	// Runnable interface
+	// //////////////////
+	public void run() {
+		switch (mode) {
+		case START_MODE:
+			try {
+				startSession();
+			} catch (final IOException ioe) {
+				handleException(ioe);
+				// ioe.printStackTrace();
+			} finally {
+				abort();
+				if (auth != null) {
+					auth.endSession();
+				}
+				log.info("Main thread(client->remote)stopped.");
+			}
+			break;
+		case ACCEPT_MODE:
+			try {
+				doAccept();
+				mode = PIPE_MODE;
+				pipe_thread1.interrupt(); // Tell other thread that connection
+				// have
+				// been accepted.
+				pipe(remote_in, out);
+			} catch (final IOException ioe) {
+				// log("Accept exception:"+ioe);
+				handleException(ioe);
+			} finally {
+				abort();
+				log.info("Accept thread(remote->client) stopped");
+			}
+			break;
+		case PIPE_MODE:
+			try {
+				pipe(remote_in, out);
+			} catch (final IOException ioe) {
+			} finally {
+				abort();
+				log.info("Support thread(remote->client) stopped");
+			}
+			break;
+		case ABORT_MODE:
+			break;
+		default:
+			log.warn("Unexpected MODE " + mode);
+		}
+	}
+
+	// Private methods
+	// ///////////////
+	private void startSession() throws IOException {
+		sock.setSoTimeout(iddleTimeout);
+
+		try {
+			auth = auth.startSession(sock);
+		} catch (final IOException ioe) {
+			log.warn("Auth throwed exception:", ioe);
+			auth = null;
+			return;
+		}
+
+		if (auth == null) { // Authentication failed
+			log.info("Authentication failed");
+			return;
+		}
+
+		in = auth.getInputStream();
+		out = auth.getOutputStream();
+
+		msg = readMsg(in);
+		handleRequest(msg);
+	}
+
+	private void handleRequest(final ProxyMessage msg) throws IOException {
+		if (!auth.checkRequest(msg)) {
+			throw new SocksException(SocksProxyBase.SOCKS_FAILURE);
+		}
+
+		if (msg.ip == null) {
+			if (msg instanceof Socks5Message) {
+				msg.ip = InetAddress.getByName(msg.host);
+			} else {
+				throw new SocksException(SocksProxyBase.SOCKS_FAILURE);
+			}
+		}
+		log(msg);
+
+		switch (msg.command) {
+		case SocksProxyBase.SOCKS_CMD_CONNECT:
+			onConnect(msg);
+			break;
+		case SocksProxyBase.SOCKS_CMD_BIND:
+			onBind(msg);
+			break;
+		case SocksProxyBase.SOCKS_CMD_UDP_ASSOCIATE:
+			onUDP(msg);
+			break;
+		default:
+			throw new SocksException(SocksProxyBase.SOCKS_CMD_NOT_SUPPORTED);
+		}
+	}
+
+	private void handleException(final IOException ioe) {
+		// If we couldn't read the request, return;
+		if (msg == null) {
+			return;
+		}
+		// If have been aborted by other thread
+		if (mode == ABORT_MODE) {
+			return;
+		}
+		// If the request was successfully completed, but exception happened
+		// later
+		if (mode == PIPE_MODE) {
+			return;
+		}
+
+		int error_code = SocksProxyBase.SOCKS_FAILURE;
+
+		if (ioe instanceof SocksException) {
+			error_code = ((SocksException) ioe).errCode;
+		} else if (ioe instanceof NoRouteToHostException) {
+			error_code = SocksProxyBase.SOCKS_HOST_UNREACHABLE;
+		} else if (ioe instanceof ConnectException) {
+			error_code = SocksProxyBase.SOCKS_CONNECTION_REFUSED;
+		} else if (ioe instanceof InterruptedIOException) {
+			error_code = SocksProxyBase.SOCKS_TTL_EXPIRE;
+		}
+
+		if ((error_code > SocksProxyBase.SOCKS_ADDR_NOT_SUPPORTED)
+				|| (error_code < 0)) {
+			error_code = SocksProxyBase.SOCKS_FAILURE;
+		}
+
+		sendErrorMessage(error_code);
+	}
+
+	private void onConnect(final ProxyMessage msg) throws IOException {
+		Socket s;
+
+		if (proxy == null) {
+			//s = new Socket(msg.ip, msg.port);
+			
+			s= SocketChannel.open().socket();
+			if ((null != s) && (null != vpnService)) {
+			    vpnService.protect(s);
+			}
+			
+			s.connect(new InetSocketAddress(msg.ip,msg.port));
+			
+		} else {
+			s = new SocksSocket(proxy, msg.ip, msg.port);
+		}
+
+		if (vpnService != null)
+			vpnService.protect(s);
+			
+		log.info("Connected to " + s.getInetAddress() + ":" + s.getPort());
+
+		ProxyMessage response = null;
+		final InetAddress localAddress = s.getLocalAddress();
+		final int localPort = s.getLocalPort();
+
+		if (msg instanceof Socks5Message) {
+			final int cmd = SocksProxyBase.SOCKS_SUCCESS;
+			response = new Socks5Message(cmd, localAddress, localPort);
+		} else {
+			final int cmd = Socks4Message.REPLY_OK;
+			response = new Socks4Message(cmd, localAddress, localPort);
+
+		}
+		response.write(out);
+		startPipe(s);
+	}
+
+	private void onBind(final ProxyMessage msg) throws IOException {
+		ProxyMessage response = null;
+
+		if (proxy == null) {
+			ss = new ServerSocket(0);
+		} else {
+			ss = new SocksServerSocket(proxy, msg.ip, msg.port);
+		}
+
+		ss.setSoTimeout(acceptTimeout);
+
+		final InetAddress inetAddress = ss.getInetAddress();
+		final int localPort = ss.getLocalPort();
+		log.info("Trying accept on {}:{}", inetAddress, localPort);
+
+		if (msg.version == 5) {
+			final int cmd = SocksProxyBase.SOCKS_SUCCESS;
+			response = new Socks5Message(cmd, inetAddress, localPort);
+		} else {
+			final int cmd = Socks4Message.REPLY_OK;
+			response = new Socks4Message(cmd, inetAddress, localPort);
+		}
+		response.write(out);
+
+		mode = ACCEPT_MODE;
+
+		pipe_thread1 = Thread.currentThread();
+		pipe_thread2 = new Thread(this);
+		pipe_thread2.start();
+
+		// Make timeout infinit.
+		sock.setSoTimeout(0);
+		int eof = 0;
+
+		try {
+			while ((eof = in.read()) >= 0) {
+				if (mode != ACCEPT_MODE) {
+					if (mode != PIPE_MODE) {
+						return;// Accept failed
+					}
+
+					remote_out.write(eof);
+					break;
+				}
+			}
+		} catch (final EOFException e) {
+			log.debug("Connection closed while we were trying to accept", e);
+			return;
+		} catch (final InterruptedIOException e) {
+			log.debug("Interrupted by unsucessful accept thread", e);
+			if (mode != PIPE_MODE) {
+				return;
+			}
+		} finally {
+			// System.out.println("Finnaly!");
+		}
+
+		if (eof < 0) {
+			return;
+		}
+
+		// Do not restore timeout, instead timeout is set on the
+		// remote socket. It does not make any difference.
+
+		pipe(in, remote_out);
+	}
+
+	private void onUDP(final ProxyMessage msg) throws IOException {
+		if (msg.ip.getHostAddress().equals("0.0.0.0")) {
+			msg.ip = sock.getInetAddress();
+		}
+		log.info("Creating UDP relay server for {}:{}", msg.ip, msg.port);
+
+		relayServer = new UDPRelayServer(msg.ip, msg.port,
+				Thread.currentThread(), sock, auth);
+
+		ProxyMessage response;
+
+		response = new Socks5Message(SocksProxyBase.SOCKS_SUCCESS,
+				relayServer.relayIP, relayServer.relayPort);
+
+		response.write(out);
+
+		relayServer.start();
+
+		// Make timeout infinit.
+		sock.setSoTimeout(0);
+		try {
+			while (in.read() >= 0) {
+				/* do nothing */;
+				// FIXME: Consider a slight delay here?
+			}
+		} catch (final EOFException eofe) {
+		}
+	}
+
+	// Private methods
+	// ////////////////
+
+	private void doAccept() throws IOException {
+		Socket s = null;
+		final long startTime = System.currentTimeMillis();
+
+		while (true) {
+			s = ss.accept();
+			if (s.getInetAddress().equals(msg.ip)) {
+				// got the connection from the right host
+				// Close listenning socket.
+				ss.close();
+				break;
+			} else if (ss instanceof SocksServerSocket) {
+				// We can't accept more then one connection
+				s.close();
+				ss.close();
+				throw new SocksException(SocksProxyBase.SOCKS_FAILURE);
+			} else {
+				if (acceptTimeout != 0) { // If timeout is not infinit
+					final long passed = System.currentTimeMillis() - startTime;
+					final int newTimeout = acceptTimeout - (int) passed;
+
+					if (newTimeout <= 0) {
+						throw new InterruptedIOException("newTimeout <= 0");
+					}
+					ss.setSoTimeout(newTimeout);
+				}
+				s.close(); // Drop all connections from other hosts
+			}
+		}
+
+		// Accepted connection
+		remote_sock = s;
+		remote_in = s.getInputStream();
+		remote_out = s.getOutputStream();
+
+		// Set timeout
+		remote_sock.setSoTimeout(iddleTimeout);
+
+		final InetAddress inetAddress = s.getInetAddress();
+		final int port = s.getPort();
+		log.info("Accepted from {}:{}", s.getInetAddress(), port);
+
+		ProxyMessage response;
+
+		if (msg.version == 5) {
+			final int cmd = SocksProxyBase.SOCKS_SUCCESS;
+			response = new Socks5Message(cmd, inetAddress, port);
+		} else {
+			final int cmd = Socks4Message.REPLY_OK;
+			response = new Socks4Message(cmd, inetAddress, port);
+		}
+		response.write(out);
+	}
+
+	private ProxyMessage readMsg(final InputStream in) throws IOException {
+		PushbackInputStream push_in;
+		if (in instanceof PushbackInputStream) {
+			push_in = (PushbackInputStream) in;
+		} else {
+			push_in = new PushbackInputStream(in);
+		}
+
+		final int version = push_in.read();
+		push_in.unread(version);
+
+		ProxyMessage msg;
+
+		if (version == 5) {
+			msg = new Socks5Message(push_in, false);
+		} else if (version == 4) {
+			msg = new Socks4Message(push_in, false);
+		} else {
+			throw new SocksException(SocksProxyBase.SOCKS_FAILURE);
+		}
+		return msg;
+	}
+
+	private void startPipe(final Socket s) {
+		mode = PIPE_MODE;
+		remote_sock = s;
+		try {
+			remote_in = s.getInputStream();
+			remote_out = s.getOutputStream();
+			pipe_thread1 = Thread.currentThread();
+			pipe_thread2 = new Thread(this);
+			pipe_thread2.start();
+			pipe(in, remote_out);
+		} catch (final IOException ioe) {
+		}
+	}
+
+	private void sendErrorMessage(final int error_code) {
+		ProxyMessage err_msg;
+		if (msg instanceof Socks4Message) {
+			err_msg = new Socks4Message(Socks4Message.REPLY_REJECTED);
+		} else {
+			err_msg = new Socks5Message(error_code);
+		}
+		try {
+			err_msg.write(out);
+		} catch (final IOException ioe) {
+		}
+	}
+
+	private synchronized void abort() {
+		if (mode == ABORT_MODE) {
+			return;
+		}
+		mode = ABORT_MODE;
+		try {
+			log.info("Aborting operation");
+			if (remote_sock != null) {
+				remote_sock.close();
+			}
+			if (sock != null) {
+				sock.close();
+			}
+			if (relayServer != null) {
+				relayServer.stop();
+			}
+			if (ss != null) {
+				ss.close();
+			}
+			if (pipe_thread1 != null) {
+				pipe_thread1.interrupt();
+			}
+			if (pipe_thread2 != null) {
+				pipe_thread2.interrupt();
+			}
+		} catch (final IOException ioe) {
+		}
+	}
+
+	static final void log(final ProxyMessage msg) {
+		log.debug("Request version: {}, Command: ", msg.version,
+				command2String(msg.command));
+
+		final String user = msg.version == 4 ? ", User:" + msg.user : "";
+		log.debug("IP:" + msg.ip + ", Port:" + msg.port + user);
+	}
+
+	private void pipe(final InputStream in, final OutputStream out)
+			throws IOException {
+		lastReadTime = System.currentTimeMillis();
+		final byte[] buf = new byte[BUF_SIZE];
+		int len = 0;
+		while (len >= 0) {
+			try {
+				if (len != 0) {
+					out.write(buf, 0, len);
+					out.flush();
+				}
+				len = in.read(buf);
+				lastReadTime = System.currentTimeMillis();
+			} catch (final InterruptedIOException iioe) {
+				if (iddleTimeout == 0) {
+					return;// Other thread interrupted us.
+				}
+				final long timeSinceRead = System.currentTimeMillis()
+						- lastReadTime;
+
+				if (timeSinceRead >= iddleTimeout - 1000) {
+					return;
+				}
+				len = 0;
+
+			}
+		}
+	}
+
+	static final String command_names[] = { "CONNECT", "BIND", "UDP_ASSOCIATE" };
+
+	static final String command2String(int cmd) {
+		if ((cmd > 0) && (cmd < 4)) {
+			return command_names[cmd - 1];
+		} else {
+			return "Unknown Command " + cmd;
+		}
+	}
+}

src/com/runjva/sourceforge/jsocks/protocol/Socks4Message.java

@@ -0,0 +1,167 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+/**
+ * SOCKS4 Reply/Request message.
+ */
+
+class Socks4Message extends ProxyMessage {
+
+	private byte[] msgBytes;
+	private int msgLength;
+
+	/**
+	 * Server failed reply, cmd command for failed request
+	 */
+	public Socks4Message(final int cmd) {
+		super(cmd, null, 0);
+		this.user = null;
+
+		msgLength = 2;
+		msgBytes = new byte[2];
+
+		msgBytes[0] = (byte) 0;
+		msgBytes[1] = (byte) command;
+	}
+
+	/**
+	 * Server successfull reply
+	 */
+	public Socks4Message(final int cmd, final InetAddress ip, final int port) {
+		this(0, cmd, ip, port, null);
+	}
+
+	/**
+	 * Client request
+	 */
+	public Socks4Message(final int cmd, final InetAddress ip, final int port,
+			final String user) {
+		this(SOCKS_VERSION, cmd, ip, port, user);
+	}
+
+	/**
+	 * Most general constructor
+	 */
+	public Socks4Message(final int version, final int cmd,
+			final InetAddress ip, final int port, final String user) {
+
+		super(cmd, ip, port);
+		this.user = user;
+		this.version = version;
+
+		msgLength = user == null ? 8 : 9 + user.length();
+		msgBytes = new byte[msgLength];
+
+		msgBytes[0] = (byte) version;
+		msgBytes[1] = (byte) command;
+		msgBytes[2] = (byte) (port >> 8);
+		msgBytes[3] = (byte) port;
+
+		byte[] addr;
+
+		if (ip != null) {
+			addr = ip.getAddress();
+		} else {
+			addr = new byte[4];
+			addr[0] = addr[1] = addr[2] = addr[3] = 0;
+		}
+		System.arraycopy(addr, 0, msgBytes, 4, 4);
+
+		if (user != null) {
+			final byte[] buf = user.getBytes();
+			System.arraycopy(buf, 0, msgBytes, 8, buf.length);
+			msgBytes[msgBytes.length - 1] = 0;
+		}
+	}
+
+	/**
+	 * Initialise from the stream If clientMode is true attempts to read a
+	 * server response otherwise reads a client request see read for more detail
+	 */
+	public Socks4Message(final InputStream in, final boolean clientMode)
+			throws IOException {
+		msgBytes = null;
+		read(in, clientMode);
+	}
+
+	public void read(final InputStream in) throws IOException {
+		read(in, true);
+	}
+
+	public void read(final InputStream in, final boolean clientMode)
+			throws IOException {
+		final DataInputStream d_in = new DataInputStream(in);
+		version = d_in.readUnsignedByte();
+		command = d_in.readUnsignedByte();
+		if (clientMode && (command != REPLY_OK)) {
+			String errMsg;
+			// FIXME: Range should be replaced with cases.
+			if ((command > REPLY_OK) && (command < REPLY_BAD_IDENTD)) {
+				errMsg = replyMessage[command - REPLY_OK];
+			} else {
+				errMsg = "Unknown Reply Code";
+			}
+			throw new SocksException(command, errMsg);
+		}
+		port = d_in.readUnsignedShort();
+		final byte[] addr = new byte[4];
+		d_in.readFully(addr);
+		ip = bytes2IP(addr);
+		host = ip.getHostName();
+		if (!clientMode) {
+			int b = in.read();
+			// FIXME: Hope there are no idiots with user name bigger than this
+			final byte[] userBytes = new byte[256];
+			int i = 0;
+			for (i = 0; (i < userBytes.length) && (b > 0); ++i) {
+				userBytes[i] = (byte) b;
+				b = in.read();
+			}
+			user = new String(userBytes, 0, i);
+		}
+	}
+
+	public void write(final OutputStream out) throws IOException {
+		if (msgBytes == null) {
+			final Socks4Message msg;
+			msg = new Socks4Message(version, command, ip, port, user);
+			msgBytes = msg.msgBytes;
+			msgLength = msg.msgLength;
+		}
+		out.write(msgBytes);
+	}
+
+	// Class methods
+	static InetAddress bytes2IP(final byte[] addr) {
+		final String s = bytes2IPV4(addr, 0);
+		try {
+			return InetAddress.getByName(s);
+		} catch (final UnknownHostException uh_ex) {
+			return null;
+		}
+	}
+
+	// Constants
+
+	static final String[] replyMessage = { "Request Granted",
+			"Request Rejected or Failed",
+			"Failed request, can't connect to Identd",
+			"Failed request, bad user name" };
+
+	static final int SOCKS_VERSION = 4;
+
+	public final static int REQUEST_CONNECT = 1;
+	public final static int REQUEST_BIND = 2;
+
+	public final static int REPLY_OK = 90;
+	public final static int REPLY_REJECTED = 91;
+	public final static int REPLY_NO_CONNECT = 92;
+	public final static int REPLY_BAD_IDENTD = 93;
+
+}

src/com/runjva/sourceforge/jsocks/protocol/Socks4Proxy.java

@@ -0,0 +1,144 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+/**
+ * Proxy which describes SOCKS4 proxy.
+ */
+
+public class Socks4Proxy extends SocksProxyBase implements Cloneable {
+
+	// Data members
+	String user;
+
+	// Public Constructors
+	// ====================
+
+	/**
+	 * Creates the SOCKS4 proxy
+	 * 
+	 * @param p
+	 *            Proxy to use to connect to this proxy, allows proxy chaining.
+	 * @param proxyHost
+	 *            Address of the proxy server.
+	 * @param proxyPort
+	 *            Port of the proxy server
+	 * @param user
+	 *            User name to use for identification purposes.
+	 * @throws UnknownHostException
+	 *             If proxyHost can't be resolved.
+	 */
+	public Socks4Proxy(SocksProxyBase p, String proxyHost, int proxyPort,
+			String user) throws UnknownHostException {
+		super(p, proxyHost, proxyPort);
+		this.user = new String(user);
+		version = 4;
+	}
+
+	/**
+	 * Creates the SOCKS4 proxy
+	 * 
+	 * @param proxyHost
+	 *            Address of the proxy server.
+	 * @param proxyPort
+	 *            Port of the proxy server
+	 * @param user
+	 *            User name to use for identification purposes.
+	 * @throws UnknownHostException
+	 *             If proxyHost can't be resolved.
+	 */
+	public Socks4Proxy(String proxyHost, int proxyPort, String user)
+			throws UnknownHostException {
+		this(null, proxyHost, proxyPort, user);
+	}
+
+	/**
+	 * Creates the SOCKS4 proxy
+	 * 
+	 * @param p
+	 *            Proxy to use to connect to this proxy, allows proxy chaining.
+	 * @param proxyIP
+	 *            Address of the proxy server.
+	 * @param proxyPort
+	 *            Port of the proxy server
+	 * @param user
+	 *            User name to use for identification purposes.
+	 */
+	public Socks4Proxy(SocksProxyBase p, InetAddress proxyIP, int proxyPort,
+			String user) {
+		super(p, proxyIP, proxyPort);
+		this.user = new String(user);
+		version = 4;
+	}
+
+	/**
+	 * Creates the SOCKS4 proxy
+	 * 
+	 * @param proxyIP
+	 *            Address of the proxy server.
+	 * @param proxyPort
+	 *            Port of the proxy server
+	 * @param user
+	 *            User name to use for identification purposes.
+	 */
+	public Socks4Proxy(InetAddress proxyIP, int proxyPort, String user) {
+		this(null, proxyIP, proxyPort, user);
+	}
+
+	// Public instance methods
+	// ========================
+
+	/**
+	 * Creates a clone of this proxy. Changes made to the clone should not
+	 * affect this object.
+	 */
+	public Object clone() {
+		final Socks4Proxy newProxy = new Socks4Proxy(proxyIP, proxyPort, user);
+		newProxy.directHosts = (InetRange) directHosts.clone();
+		newProxy.chainProxy = chainProxy;
+		return newProxy;
+	}
+
+	// Public Static(Class) Methods
+	// ==============================
+
+	// Protected Methods
+	// =================
+
+	protected SocksProxyBase copy() {
+		final Socks4Proxy copy = new Socks4Proxy(proxyIP, proxyPort, user);
+		copy.directHosts = this.directHosts;
+		copy.chainProxy = chainProxy;
+		return copy;
+	}
+
+	protected ProxyMessage formMessage(int cmd, InetAddress ip, int port) {
+		switch (cmd) {
+		case SOCKS_CMD_CONNECT:
+			cmd = Socks4Message.REQUEST_CONNECT;
+			break;
+		case SOCKS_CMD_BIND:
+			cmd = Socks4Message.REQUEST_BIND;
+			break;
+		default:
+			return null;
+		}
+		return new Socks4Message(cmd, ip, port, user);
+	}
+
+	protected ProxyMessage formMessage(int cmd, String host, int port)
+			throws UnknownHostException {
+
+		return formMessage(cmd, InetAddress.getByName(host), port);
+	}
+
+	protected ProxyMessage formMessage(InputStream in) throws SocksException,
+			IOException {
+
+		return new Socks4Message(in, true);
+	}
+
+}

src/com/runjva/sourceforge/jsocks/protocol/Socks5DatagramSocket.java

@@ -0,0 +1,485 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Datagram socket to interract through the firewall.<BR>
+ * Can be used same way as the normal DatagramSocket. One should be carefull
+ * though with the datagram sizes used, as additional data is present in both
+ * incomming and outgoing datagrams.
+ * <p>
+ * SOCKS5 protocol allows to send host address as either:
+ * <ul>
+ * <li>IPV4, normal 4 byte address. (10 bytes header size)
+ * <li>IPV6, version 6 ip address (not supported by Java as for now). 22 bytes
+ * header size.
+ * <li>Host name,(7+length of the host name bytes header size).
+ * </ul>
+ * As with other Socks equivalents, direct addresses are handled transparently,
+ * that is data will be send directly when required by the proxy settings.
+ * <p>
+ * <b>NOTE:</b><br>
+ * Unlike other SOCKS Sockets, it <b>does not</b> support proxy chaining, and
+ * will throw an exception if proxy has a chain proxy attached. The reason for
+ * that is not my laziness, but rather the restrictions of the SOCKSv5 protocol.
+ * Basicaly SOCKSv5 proxy server, needs to know from which host:port datagrams
+ * will be send for association, and returns address to which datagrams should
+ * be send by the client, but it does not inform client from which host:port it
+ * is going to send datagrams, in fact there is even no guarantee they will be
+ * send at all and from the same address each time.
+ */
+public class Socks5DatagramSocket extends DatagramSocket {
+
+	InetAddress relayIP;
+	int relayPort;
+	Socks5Proxy proxy;
+	private boolean server_mode = false;
+	UDPEncapsulation encapsulation;
+
+	private Logger log = LoggerFactory.getLogger(Socks5DatagramSocket.class);
+
+	/**
+	 * Construct Datagram socket for communication over SOCKS5 proxy server.
+	 * This constructor uses default proxy, the one set with
+	 * Proxy.setDefaultProxy() method. If default proxy is not set or it is set
+	 * to version4 proxy, which does not support datagram forwarding, throws
+	 * SocksException.
+	 */
+	public Socks5DatagramSocket() throws SocksException, IOException {
+		this(SocksProxyBase.defaultProxy, 0, null);
+	}
+
+	/**
+	 * Construct Datagram socket for communication over SOCKS5 proxy server. And
+	 * binds it to the specified local port. This constructor uses default
+	 * proxy, the one set with Proxy.setDefaultProxy() method. If default proxy
+	 * is not set or it is set to version4 proxy, which does not support
+	 * datagram forwarding, throws SocksException.
+	 */
+	public Socks5DatagramSocket(int port) throws SocksException, IOException {
+		this(SocksProxyBase.defaultProxy, port, null);
+	}
+
+	/**
+	 * Construct Datagram socket for communication over SOCKS5 proxy server. And
+	 * binds it to the specified local port and address. This constructor uses
+	 * default proxy, the one set with Proxy.setDefaultProxy() method. If
+	 * default proxy is not set or it is set to version4 proxy, which does not
+	 * support datagram forwarding, throws SocksException.
+	 */
+	public Socks5DatagramSocket(int port, InetAddress ip)
+			throws SocksException, IOException {
+		this(SocksProxyBase.defaultProxy, port, ip);
+	}
+
+	/**
+	 * Constructs datagram socket for communication over specified proxy. And
+	 * binds it to the given local address and port. Address of null and port of
+	 * 0, signify any availabale port/address. Might throw SocksException, if:
+	 * <ol>
+	 * <li>Given version of proxy does not support UDP_ASSOCIATE.
+	 * <li>Proxy can't be reached.
+	 * <li>Authorization fails.
+	 * <li>Proxy does not want to perform udp forwarding, for any reason.
+	 * </ol>
+	 * Might throw IOException if binding datagram socket to given address/port
+	 * fails. See java.net.DatagramSocket for more details.
+	 */
+	public Socks5DatagramSocket(SocksProxyBase p, int port, InetAddress ip)
+			throws SocksException, IOException {
+
+		super(port, ip);
+
+		if (p == null) {
+			throw new SocksException(SocksProxyBase.SOCKS_NO_PROXY);
+		}
+
+		if (!(p instanceof Socks5Proxy)) {
+			final String s = "Datagram Socket needs Proxy version 5";
+			throw new SocksException(-1, s);
+		}
+
+		if (p.chainProxy != null) {
+			final String s = "Datagram Sockets do not support proxy chaining.";
+			throw new SocksException(SocksProxyBase.SOCKS_JUST_ERROR, s);
+		}
+
+		proxy = (Socks5Proxy) p.copy();
+
+		final ProxyMessage msg = proxy.udpAssociate(super.getLocalAddress(),
+				super.getLocalPort());
+
+		relayIP = msg.ip;
+		if (relayIP.getHostAddress().equals("0.0.0.0")) {
+			// FIXME: What happens here?
+			relayIP = proxy.proxyIP;
+		}
+		relayPort = msg.port;
+
+		encapsulation = proxy.udp_encapsulation;
+
+		log.debug("Datagram Socket:{}:{}", getLocalAddress(), getLocalPort());
+		log.debug("Socks5Datagram: {}:{}", relayIP, relayPort);
+	}
+
+	/**
+	 * Used by UDPRelayServer.
+	 */
+	Socks5DatagramSocket(boolean server_mode, UDPEncapsulation encapsulation,
+			InetAddress relayIP, int relayPort) throws IOException {
+		super();
+		this.server_mode = server_mode;
+		this.relayIP = relayIP;
+		this.relayPort = relayPort;
+		this.encapsulation = encapsulation;
+		this.proxy = null;
+	}
+
+	/**
+	 * Sends the Datagram either through the proxy or directly depending on
+	 * current proxy settings and destination address. <BR>
+	 * 
+	 * <B> NOTE: </B> DatagramPacket size should be at least 10 bytes less than
+	 * the systems limit.
+	 * 
+	 * <P>
+	 * See documentation on java.net.DatagramSocket for full details on how to
+	 * use this method.
+	 * 
+	 * @param dp
+	 *            Datagram to send.
+	 * @throws IOException
+	 *             If error happens with I/O.
+	 */
+	public void send(DatagramPacket dp) throws IOException {
+		// If the host should be accessed directly, send it as is.
+		if (!server_mode && proxy.isDirect(dp.getAddress())) {
+			super.send(dp);
+			log.debug("Sending datagram packet directly:");
+			return;
+		}
+
+		final byte[] head = formHeader(dp.getAddress(), dp.getPort());
+		byte[] buf = new byte[head.length + dp.getLength()];
+		final byte[] data = dp.getData();
+
+		// Merge head and data
+		System.arraycopy(head, 0, buf, 0, head.length);
+		// System.arraycopy(data,dp.getOffset(),buf,head.length,dp.getLength());
+		System.arraycopy(data, 0, buf, head.length, dp.getLength());
+
+		if (encapsulation != null) {
+			buf = encapsulation.udpEncapsulate(buf, true);
+		}
+
+		super.send(new DatagramPacket(buf, buf.length, relayIP, relayPort));
+	}
+
+	/**
+	 * This method allows to send datagram packets with address type DOMAINNAME.
+	 * SOCKS5 allows to specify host as names rather than ip addresses.Using
+	 * this method one can send udp datagrams through the proxy, without having
+	 * to know the ip address of the destination host.
+	 * <p>
+	 * If proxy specified for that socket has an option resolveAddrLocally set
+	 * to true host will be resolved, and the datagram will be send with address
+	 * type IPV4, if resolve fails, UnknownHostException is thrown.
+	 * 
+	 * @param dp
+	 *            Datagram to send, it should contain valid port and data
+	 * @param host
+	 *            Host name to which datagram should be send.
+	 * @throws IOException
+	 *             If error happens with I/O, or the host can't be resolved when
+	 *             proxy settings say that hosts should be resolved locally.
+	 * @see Socks5Proxy#resolveAddrLocally(boolean)
+	 */
+	public void send(DatagramPacket dp, String host) throws IOException {
+		if (proxy.isDirect(host)) {
+			dp.setAddress(InetAddress.getByName(host));
+			super.send(dp);
+			return;
+		}
+
+		if ((proxy).resolveAddrLocally) {
+			dp.setAddress(InetAddress.getByName(host));
+		}
+
+		final byte[] head = formHeader(host, dp.getPort());
+		byte[] buf = new byte[head.length + dp.getLength()];
+		final byte[] data = dp.getData();
+		// Merge head and data
+		System.arraycopy(head, 0, buf, 0, head.length);
+		// System.arraycopy(data,dp.getOffset(),buf,head.length,dp.getLength());
+		System.arraycopy(data, 0, buf, head.length, dp.getLength());
+
+		if (encapsulation != null) {
+			buf = encapsulation.udpEncapsulate(buf, true);
+		}
+
+		super.send(new DatagramPacket(buf, buf.length, relayIP, relayPort));
+	}
+
+	/**
+	 * Receives udp packet. If packet have arrived from the proxy relay server,
+	 * it is processed and address and port of the packet are set to the address
+	 * and port of sending host.<BR>
+	 * If the packet arrived from anywhere else it is not changed.<br>
+	 * <B> NOTE: </B> DatagramPacket size should be at least 10 bytes bigger
+	 * than the largest packet you expect (this is for IPV4 addresses). For
+	 * hostnames and IPV6 it is even more.
+	 * 
+	 * @param dp
+	 *            Datagram in which all relevent information will be copied.
+	 */
+	public void receive(DatagramPacket dp) throws IOException {
+		super.receive(dp);
+
+		if (server_mode) {
+			// Drop all datagrams not from relayIP/relayPort
+			final int init_length = dp.getLength();
+			final int initTimeout = getSoTimeout();
+			final long startTime = System.currentTimeMillis();
+
+			while (!relayIP.equals(dp.getAddress())
+					|| (relayPort != dp.getPort())) {
+
+				// Restore datagram size
+				dp.setLength(init_length);
+
+				// If there is a non-infinit timeout on this socket
+				// Make sure that it happens no matter how often unexpected
+				// packets arrive.
+				if (initTimeout != 0) {
+					final long passed = System.currentTimeMillis() - startTime;
+					final int newTimeout = initTimeout - (int) passed;
+
+					if (newTimeout <= 0) {
+						throw new InterruptedIOException(
+								"In Socks5DatagramSocket->receive()");
+					}
+					setSoTimeout(newTimeout);
+				}
+
+				super.receive(dp);
+			}
+
+			// Restore timeout settings
+			if (initTimeout != 0) {
+				setSoTimeout(initTimeout);
+			}
+
+		} else if (!relayIP.equals(dp.getAddress())
+				|| (relayPort != dp.getPort())) {
+			return; // Recieved direct packet
+			// If the datagram is not from the relay server, return it it as is.
+		}
+
+		byte[] data;
+		data = dp.getData();
+
+		if (encapsulation != null) {
+			data = encapsulation.udpEncapsulate(data, false);
+		}
+
+		// FIXME: What is this?
+		final int offset = 0; // Java 1.1
+		// int offset = dp.getOffset(); //Java 1.2
+
+		final ByteArrayInputStream bIn = new ByteArrayInputStream(data, offset,
+				dp.getLength());
+
+		final ProxyMessage msg = new Socks5Message(bIn);
+		dp.setPort(msg.port);
+		dp.setAddress(msg.getInetAddress());
+
+		// what wasn't read by the Message is the data
+		final int data_length = bIn.available();
+		// Shift data to the left
+		System.arraycopy(data, offset + dp.getLength() - data_length, data,
+				offset, data_length);
+
+		dp.setLength(data_length);
+	}
+
+	/**
+	 * Returns port assigned by the proxy, to which datagrams are relayed. It is
+	 * not the same port to which other party should send datagrams.
+	 * 
+	 * @return Port assigned by socks server to which datagrams are send for
+	 *         association.
+	 */
+	public int getLocalPort() {
+		if (server_mode) {
+			return super.getLocalPort();
+		}
+		return relayPort;
+	}
+
+	/**
+	 * Address assigned by the proxy, to which datagrams are send for relay. It
+	 * is not necesseraly the same address, to which other party should send
+	 * datagrams.
+	 * 
+	 * @return Address to which datagrams are send for association.
+	 */
+	public InetAddress getLocalAddress() {
+		if (server_mode) {
+			return super.getLocalAddress();
+		}
+		return relayIP;
+	}
+
+	/**
+	 * Closes datagram socket, and proxy connection.
+	 */
+	public void close() {
+		if (!server_mode) {
+			proxy.endSession();
+		}
+		super.close();
+	}
+
+	/**
+	 * This method checks wether proxy still runs udp forwarding service for
+	 * this socket.
+	 * <p>
+	 * This methods checks wether the primary connection to proxy server is
+	 * active. If it is, chances are that proxy continues to forward datagrams
+	 * being send from this socket. If it was closed, most likely datagrams are
+	 * no longer being forwarded by the server.
+	 * <p>
+	 * Proxy might decide to stop forwarding datagrams, in which case it should
+	 * close primary connection. This method allows to check, wether this have
+	 * been done.
+	 * <p>
+	 * You can specify timeout for which we should be checking EOF condition on
+	 * the primary connection. Timeout is in milliseconds. Specifying 0 as
+	 * timeout implies infinity, in which case method will block, until
+	 * connection to proxy is closed or an error happens, and then return false.
+	 * <p>
+	 * One possible scenario is to call isProxyactive(0) in separate thread, and
+	 * once it returned notify other threads about this event.
+	 * 
+	 * @param timeout
+	 *            For how long this method should block, before returning.
+	 * @return true if connection to proxy is active, false if eof or error
+	 *         condition have been encountered on the connection.
+	 */
+	public boolean isProxyAlive(int timeout) {
+		if (server_mode) {
+			return false;
+		}
+		if (proxy != null) {
+			try {
+				proxy.proxySocket.setSoTimeout(timeout);
+
+				final int eof = proxy.in.read();
+				if (eof < 0) {
+					return false; // EOF encountered.
+				} else {
+					log.warn("This really should not happen");
+					return true; // This really should not happen
+				}
+
+			} catch (final InterruptedIOException iioe) {
+				return true; // read timed out.
+			} catch (final IOException ioe) {
+				return false;
+			}
+		}
+		return false;
+	}
+
+	// PRIVATE METHODS
+	// ////////////////
+
+	private byte[] formHeader(InetAddress ip, int port) {
+		final Socks5Message request = new Socks5Message(0, ip, port);
+		request.data[0] = 0;
+		return request.data;
+	}
+
+	private byte[] formHeader(String host, int port) {
+		final Socks5Message request = new Socks5Message(0, host, port);
+		request.data[0] = 0;
+		return request.data;
+	}
+
+	/*
+	 * ======================================================================
+	 * 
+	 * //Mainly Test functions //////////////////////
+	 * 
+	 * private String bytes2String(byte[] b){ String s=""; char[] hex_digit = {
+	 * '0','1','2','3','4','5','6','7','8','9', 'A','B','C','D','E','F'};
+	 * for(int i=0;i<b.length;++i){ int i1 = (b[i] & 0xF0) >> 4; int i2 = b[i] &
+	 * 0xF; s+=hex_digit[i1]; s+=hex_digit[i2]; s+=" "; } return s; } private
+	 * static final void debug(String s){ if(DEBUG) System.out.print(s); }
+	 * 
+	 * private static final boolean DEBUG = true;
+	 * 
+	 * 
+	 * public static void usage(){ System.err.print(
+	 * "Usage: java Socks.SocksDatagramSocket host port [socksHost socksPort]\n"
+	 * ); }
+	 * 
+	 * static final int defaultProxyPort = 1080; //Default Port static final
+	 * String defaultProxyHost = "www-proxy"; //Default proxy
+	 * 
+	 * public static void main(String args[]){ int port; String host; int
+	 * proxyPort; String proxyHost; InetAddress ip;
+	 * 
+	 * if(args.length > 1 && args.length < 5){ try{
+	 * 
+	 * host = args[0]; port = Integer.parseInt(args[1]);
+	 * 
+	 * proxyPort =(args.length > 3)? Integer.parseInt(args[3]) :
+	 * defaultProxyPort;
+	 * 
+	 * host = args[0]; ip = InetAddress.getByName(host);
+	 * 
+	 * proxyHost =(args.length > 2)? args[2] : defaultProxyHost;
+	 * 
+	 * Proxy.setDefaultProxy(proxyHost,proxyPort); Proxy p =
+	 * Proxy.getDefaultProxy(); p.addDirect("lux");
+	 * 
+	 * 
+	 * DatagramSocket ds = new Socks5DatagramSocket();
+	 * 
+	 * 
+	 * BufferedReader in = new BufferedReader( new
+	 * InputStreamReader(System.in)); String s;
+	 * 
+	 * System.out.print("Enter line:"); s = in.readLine();
+	 * 
+	 * while(s != null){ byte[] data = (s+"\r\n").getBytes(); DatagramPacket dp
+	 * = new DatagramPacket(data,0,data.length, ip,port);
+	 * System.out.println("Sending to: "+ip+":"+port); ds.send(dp); dp = new
+	 * DatagramPacket(new byte[1024],1024);
+	 * 
+	 * System.out.println("Trying to recieve on port:"+ ds.getLocalPort());
+	 * ds.receive(dp); System.out.print("Recieved:\n"+
+	 * "From:"+dp.getAddress()+":"+dp.getPort()+ "\n\n"+ new
+	 * String(dp.getData(),dp.getOffset(),dp.getLength())+"\n" );
+	 * System.out.print("Enter line:"); s = in.readLine();
+	 * 
+	 * } ds.close(); System.exit(1);
+	 * 
+	 * }catch(SocksException s_ex){ System.err.println("SocksException:"+s_ex);
+	 * s_ex.printStackTrace(); System.exit(1); }catch(IOException io_ex){
+	 * io_ex.printStackTrace(); System.exit(1); }catch(NumberFormatException
+	 * num_ex){ usage(); num_ex.printStackTrace(); System.exit(1); }
+	 * 
+	 * }else{ usage(); } }
+	 */
+
+}

src/com/runjva/sourceforge/jsocks/protocol/Socks5Message.java

@@ -0,0 +1,330 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * SOCKS5 request/response message.
+ */
+
+class Socks5Message extends ProxyMessage {
+	/** Address type of given message */
+	public int addrType;
+
+	byte[] data;
+
+	private Logger log = LoggerFactory.getLogger(Socks5Message.class);
+
+	/**
+	 * Server error response.
+	 * 
+	 * @param cmd
+	 *            Error code.
+	 */
+	public Socks5Message(int cmd) {
+		super(cmd, null, 0);
+		data = new byte[3];
+		data[0] = SOCKS_VERSION; // Version.
+		data[1] = (byte) cmd; // Reply code for some kind of failure.
+		data[2] = 0; // Reserved byte.
+	}
+
+	/**
+	 * Construct client request or server response.
+	 * 
+	 * @param cmd
+	 *            - Request/Response code.
+	 * @param ip
+	 *            - IP field.
+	 * @paarm port - port field.
+	 */
+	public Socks5Message(int cmd, InetAddress ip, int port) {
+		super(cmd, ip, port);
+
+		if (ip == null) {
+			this.host = "0.0.0.0";
+		} else {
+			this.host = ip.getHostName();
+		}
+
+		this.version = SOCKS_VERSION;
+
+		byte[] addr;
+
+		if (ip == null) {
+			addr = new byte[4];
+			addr[0] = addr[1] = addr[2] = addr[3] = 0;
+		} else {
+			addr = ip.getAddress();
+		}
+
+		if (addr.length == 4) {
+			addrType = SOCKS_ATYP_IPV4;
+		} else {
+			addrType = SOCKS_ATYP_IPV6;
+		}
+
+		data = new byte[6 + addr.length];
+		data[0] = (byte) SOCKS_VERSION; // Version
+		data[1] = (byte) command; // Command
+		data[2] = (byte) 0; // Reserved byte
+		data[3] = (byte) addrType; // Address type
+
+		// Put Address
+		System.arraycopy(addr, 0, data, 4, addr.length);
+		// Put port
+		data[data.length - 2] = (byte) (port >> 8);
+		data[data.length - 1] = (byte) (port);
+	}
+
+	/**
+	 * Construct client request or server response.
+	 * 
+	 * @param cmd
+	 *            - Request/Response code.
+	 * @param hostName
+	 *            - IP field as hostName, uses ADDR_TYPE of HOSTNAME.
+	 * @paarm port - port field.
+	 */
+	public Socks5Message(int cmd, String hostName, int port) {
+		super(cmd, null, port);
+		this.host = hostName;
+		this.version = SOCKS_VERSION;
+
+		log.debug("Doing ATYP_DOMAINNAME");
+
+		addrType = SOCKS_ATYP_DOMAINNAME;
+		final byte addr[] = hostName.getBytes();
+
+		data = new byte[7 + addr.length];
+		data[0] = (byte) SOCKS_VERSION; // Version
+		data[1] = (byte) command; // Command
+		data[2] = (byte) 0; // Reserved byte
+		data[3] = (byte) SOCKS_ATYP_DOMAINNAME; // Address type
+		data[4] = (byte) addr.length; // Length of the address
+
+		// Put Address
+		System.arraycopy(addr, 0, data, 5, addr.length);
+		// Put port
+		data[data.length - 2] = (byte) (port >> 8);
+		data[data.length - 1] = (byte) (port);
+	}
+
+	/**
+	 * Initialises Message from the stream. Reads server response from given
+	 * stream.
+	 * 
+	 * @param in
+	 *            Input stream to read response from.
+	 * @throws SocksException
+	 *             If server response code is not SOCKS_SUCCESS(0), or if any
+	 *             error with protocol occurs.
+	 * @throws IOException
+	 *             If any error happens with I/O.
+	 */
+	public Socks5Message(InputStream in) throws SocksException, IOException {
+		this(in, true);
+	}
+
+	/**
+	 * Initialises Message from the stream. Reads server response or client
+	 * request from given stream.
+	 * 
+	 * @param in
+	 *            Input stream to read response from.
+	 * @param clinetMode
+	 *            If true read server response, else read client request.
+	 * @throws SocksException
+	 *             If server response code is not SOCKS_SUCCESS(0) and reading
+	 *             in client mode, or if any error with protocol occurs.
+	 * @throws IOException
+	 *             If any error happens with I/O.
+	 */
+	public Socks5Message(InputStream in, boolean clientMode)
+			throws SocksException, IOException {
+
+		read(in, clientMode);
+	}
+
+	/**
+	 * Initialises Message from the stream. Reads server response from given
+	 * stream.
+	 * 
+	 * @param in
+	 *            Input stream to read response from.
+	 * @throws SocksException
+	 *             If server response code is not SOCKS_SUCCESS(0), or if any
+	 *             error with protocol occurs.
+	 * @throws IOException
+	 *             If any error happens with I/O.
+	 */
+	public void read(InputStream in) throws SocksException, IOException {
+		read(in, true);
+	}
+
+	/**
+	 * Initialises Message from the stream. Reads server response or client
+	 * request from given stream.
+	 * 
+	 * @param in
+	 *            Input stream to read response from.
+	 * @param clinetMode
+	 *            If true read server response, else read client request.
+	 * @throws SocksException
+	 *             If server response code is not SOCKS_SUCCESS(0) and reading
+	 *             in client mode, or if any error with protocol occurs.
+	 * @throws IOException
+	 *             If any error happens with I/O.
+	 */
+	public void read(InputStream in, boolean clientMode) throws SocksException,
+			IOException {
+
+		data = null;
+		ip = null;
+
+		final DataInputStream di = new DataInputStream(in);
+
+		version = di.readUnsignedByte();
+		command = di.readUnsignedByte();
+
+		if (clientMode && (command != 0)) {
+			throw new SocksException(command);
+		}
+
+		di.readUnsignedByte();
+		addrType = di.readUnsignedByte();
+
+		byte addr[];
+
+		switch (addrType) {
+		case SOCKS_ATYP_IPV4:
+			addr = new byte[4];
+			di.readFully(addr);
+			host = bytes2IPV4(addr, 0);
+			break;
+		case SOCKS_ATYP_IPV6:
+			addr = new byte[SOCKS_IPV6_LENGTH];// I believe it is 16 bytes,huge!
+			di.readFully(addr);
+			host = bytes2IPV6(addr, 0);
+			break;
+		case SOCKS_ATYP_DOMAINNAME:
+			log.debug("Reading ATYP_DOMAINNAME");
+			addr = new byte[di.readUnsignedByte()];// Next byte shows the length
+			di.readFully(addr);
+			host = new String(addr);
+			break;
+		default:
+			throw (new SocksException(SocksProxyBase.SOCKS_JUST_ERROR));
+		}
+
+		port = di.readUnsignedShort();
+
+		if ((addrType != SOCKS_ATYP_DOMAINNAME) && doResolveIP) {
+			try {
+				ip = InetAddress.getByName(host);
+			} catch (final UnknownHostException uh_ex) {
+			}
+		}
+	}
+
+	/**
+	 * Writes the message to the stream.
+	 * 
+	 * @param out
+	 *            Output stream to which message should be written.
+	 */
+	public void write(OutputStream out) throws SocksException, IOException {
+		if (data == null) {
+			Socks5Message msg;
+
+			if (addrType == SOCKS_ATYP_DOMAINNAME) {
+				msg = new Socks5Message(command, host, port);
+			} else {
+				if (ip == null) {
+					try {
+						ip = InetAddress.getByName(host);
+					} catch (final UnknownHostException uh_ex) {
+						throw new SocksException(
+								SocksProxyBase.SOCKS_JUST_ERROR);
+					}
+				}
+				msg = new Socks5Message(command, ip, port);
+			}
+			data = msg.data;
+		}
+		out.write(data);
+	}
+
+	/**
+	 * Returns IP field of the message as IP, if the message was created with
+	 * ATYP of HOSTNAME, it will attempt to resolve the hostname, which might
+	 * fail.
+	 * 
+	 * @throws UnknownHostException
+	 *             if host can't be resolved.
+	 */
+	public InetAddress getInetAddress() throws UnknownHostException {
+		if (ip != null) {
+			return ip;
+		}
+
+		return (ip = InetAddress.getByName(host));
+	}
+
+	/**
+	 * Returns string representation of the message.
+	 */
+	public String toString() {
+		// FIXME: Single line version, please.
+		final String s = "Socks5Message:" + "\n" + "VN   " + version + "\n"
+				+ "CMD  " + command + "\n" + "ATYP " + addrType + "\n"
+				+ "ADDR " + host + "\n" + "PORT " + port + "\n";
+		return s;
+	}
+
+	/**
+	 *Wether to resolve hostIP returned from SOCKS server that is wether to
+	 * create InetAddress object from the hostName string
+	 */
+	static public boolean resolveIP() {
+		return doResolveIP;
+	}
+
+	/**
+	 *Wether to resolve hostIP returned from SOCKS server that is wether to
+	 * create InetAddress object from the hostName string
+	 * 
+	 * @param doResolve
+	 *            Wether to resolve hostIP from SOCKS server.
+	 *@return Previous value.
+	 */
+	static public boolean resolveIP(boolean doResolve) {
+		final boolean old = doResolveIP;
+		doResolveIP = doResolve;
+		return old;
+	}
+
+	/*
+	 * private static final void debug(String s){ if(DEBUG) System.out.print(s);
+	 * } private static final boolean DEBUG = false;
+	 */
+
+	// SOCKS5 constants
+	public static final int SOCKS_VERSION = 5;
+
+	public static final int SOCKS_ATYP_IPV4 = 0x1; // Where is 2??
+	public static final int SOCKS_ATYP_DOMAINNAME = 0x3; // !!!!rfc1928
+	public static final int SOCKS_ATYP_IPV6 = 0x4;
+
+	public static final int SOCKS_IPV6_LENGTH = 16;
+
+	static boolean doResolveIP = true;
+
+}

src/com/runjva/sourceforge/jsocks/protocol/Socks5Proxy.java

@@ -0,0 +1,295 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+import java.util.Enumeration;
+import java.util.Hashtable;
+
+/**
+ * SOCKS5 Proxy.
+ */
+
+public class Socks5Proxy extends SocksProxyBase implements Cloneable {
+
+	// Data members
+	private Hashtable<Integer, Authentication> authMethods = new Hashtable<Integer, Authentication>();
+	private int selectedMethod;
+
+	boolean resolveAddrLocally = true;
+	UDPEncapsulation udp_encapsulation = null;
+
+	// Public Constructors
+	// ====================
+
+	/**
+	 * Creates SOCKS5 proxy.
+	 * 
+	 * @param p
+	 *            Proxy to use to connect to this proxy, allows proxy chaining.
+	 * @param proxyHost
+	 *            Host on which a Proxy server runs.
+	 * @param proxyPort
+	 *            Port on which a Proxy server listens for connections.
+	 * @throws UnknownHostException
+	 *             If proxyHost can't be resolved.
+	 */
+	public Socks5Proxy(SocksProxyBase p, String proxyHost, int proxyPort)
+			throws UnknownHostException {
+
+		super(p, proxyHost, proxyPort);
+		version = 5;
+		setAuthenticationMethod(0, new AuthenticationNone());
+	}
+
+	/**
+	 * Creates SOCKS5 proxy.
+	 * 
+	 * @param proxyHost
+	 *            Host on which a Proxy server runs.
+	 * @param proxyPort
+	 *            Port on which a Proxy server listens for connections.
+	 * @throws UnknownHostException
+	 *             If proxyHost can't be resolved.
+	 */
+	public Socks5Proxy(String proxyHost, int proxyPort)
+			throws UnknownHostException {
+		this(null, proxyHost, proxyPort);
+	}
+
+	/**
+	 * Creates SOCKS5 proxy.
+	 * 
+	 * @param p
+	 *            Proxy to use to connect to this proxy, allows proxy chaining.
+	 * @param proxyIP
+	 *            Host on which a Proxy server runs.
+	 * @param proxyPort
+	 *            Port on which a Proxy server listens for connections.
+	 */
+	public Socks5Proxy(SocksProxyBase p, InetAddress proxyIP, int proxyPort) {
+		super(p, proxyIP, proxyPort);
+		version = 5;
+		setAuthenticationMethod(0, new AuthenticationNone());
+	}
+
+	/**
+	 * Creates SOCKS5 proxy.
+	 * 
+	 * @param proxyIP
+	 *            Host on which a Proxy server runs.
+	 * @param proxyPort
+	 *            Port on which a Proxy server listens for connections.
+	 */
+	public Socks5Proxy(InetAddress proxyIP, int proxyPort) {
+		this(null, proxyIP, proxyPort);
+	}
+
+	// Public instance methods
+	// ========================
+
+	/**
+	 * Wether to resolve address locally or to let proxy do so.
+	 * <p>
+	 * SOCKS5 protocol allows to send host names rather then IPs in the
+	 * requests, this option controls wether the hostnames should be send to the
+	 * proxy server as names, or should they be resolved locally.
+	 * 
+	 * @param doResolve
+	 *            Wether to perform resolution locally.
+	 * @return Previous settings.
+	 */
+	public boolean resolveAddrLocally(boolean doResolve) {
+		final boolean old = resolveAddrLocally;
+		resolveAddrLocally = doResolve;
+		return old;
+	}
+
+	/**
+	 * Get current setting on how the addresses should be handled.
+	 * 
+	 * @return Current setting for address resolution.
+	 * @see Socks5Proxy#resolveAddrLocally(boolean doResolve)
+	 */
+	public boolean resolveAddrLocally() {
+		return resolveAddrLocally;
+	}
+
+	/**
+	 * Adds another authentication method.
+	 * 
+	 * @param methodId
+	 *            Authentication method id, see rfc1928
+	 * @param method
+	 *            Implementation of Authentication
+	 * @see Authentication
+	 */
+	public boolean setAuthenticationMethod(int methodId, Authentication method) {
+		if ((methodId < 0) || (methodId > 255)) {
+			return false;
+		}
+		if (method == null) {
+			// Want to remove a particular method
+			return (authMethods.remove(new Integer(methodId)) != null);
+		} else {// Add the method, or rewrite old one
+			authMethods.put(new Integer(methodId), method);
+		}
+		return true;
+	}
+
+	/**
+	 * Get authentication method, which corresponds to given method id
+	 * 
+	 * @param methodId
+	 *            Authentication method id.
+	 * @return Implementation for given method or null, if one was not set.
+	 */
+	public Authentication getAuthenticationMethod(int methodId) {
+		final Object method = authMethods.get(new Integer(methodId));
+		if (method == null) {
+			return null;
+		}
+		return (Authentication) method;
+	}
+
+	/**
+	 * Creates a clone of this Proxy. clone() returns an
+	 */
+	@SuppressWarnings("unchecked")
+	public Object clone() {
+		final Socks5Proxy newProxy = new Socks5Proxy(proxyIP, proxyPort);
+
+		final Object o = this.authMethods.clone();
+		newProxy.authMethods = (Hashtable<Integer, Authentication>) o;
+
+		newProxy.directHosts = (InetRange) directHosts.clone();
+		newProxy.resolveAddrLocally = resolveAddrLocally;
+		newProxy.chainProxy = chainProxy;
+		return newProxy;
+	}
+
+	// Public Static(Class) Methods
+	// ==============================
+
+	// Protected Methods
+	// =================
+
+	protected SocksProxyBase copy() {
+		final Socks5Proxy copy = new Socks5Proxy(proxyIP, proxyPort);
+
+		copy.authMethods = this.authMethods; // same Hash, no copy
+		copy.directHosts = this.directHosts;
+		copy.chainProxy = this.chainProxy;
+		copy.resolveAddrLocally = this.resolveAddrLocally;
+		return copy;
+	}
+
+	/**
+    *
+    *
+    */
+	protected void startSession() throws SocksException {
+		super.startSession();
+		Authentication auth;
+		final Socket ps = proxySocket; // The name is too long
+
+		try {
+
+			final byte nMethods = (byte) authMethods.size(); // Number of
+			// methods
+
+			final byte[] buf = new byte[2 + nMethods]; // 2 is for VER,NMETHODS
+			buf[0] = (byte) version;
+			buf[1] = nMethods; // Number of methods
+			int i = 2;
+
+			final Enumeration<Integer> ids = authMethods.keys();
+			while (ids.hasMoreElements()) {
+				buf[i++] = (byte) ids.nextElement().intValue();
+			}
+
+			out.write(buf);
+			out.flush();
+
+			final int versionNumber = in.read();
+			selectedMethod = in.read();
+
+			if ((versionNumber < 0) || (selectedMethod < 0)) {
+				// EOF condition was reached
+				endSession();
+				final String s = "Connection to proxy lost.";
+				throw new SocksException(SOCKS_PROXY_IO_ERROR, s);
+			}
+
+			if (versionNumber < version) {
+				// What should we do??
+			}
+
+			if (selectedMethod == 0xFF) { // No method selected
+				ps.close();
+				throw (new SocksException(SOCKS_AUTH_NOT_SUPPORTED));
+			}
+
+			auth = getAuthenticationMethod(selectedMethod);
+			if (auth == null) {
+				// This shouldn't happen, unless method was removed by other
+				// thread, or the server stuffed up
+				final String s = "Specified Authentication not found!";
+				throw new SocksException(SOCKS_JUST_ERROR, s);
+			}
+
+			final Object[] in_out;
+			in_out = auth.doSocksAuthentication(selectedMethod, ps);
+
+			if (in_out == null) {
+				// Authentication failed by some reason
+				throw (new SocksException(SOCKS_AUTH_FAILURE));
+			}
+
+			/*
+			 * Most authentication methods are expected to return simply the
+			 * input/output streams associated with the socket. However if the
+			 * auth. method requires some kind of encryption/decryption being
+			 * done on the connection it should provide classes to handle I/O.
+			 */
+
+			in = (InputStream) in_out[0];
+			out = (OutputStream) in_out[1];
+			if (in_out.length > 2) {
+				udp_encapsulation = (UDPEncapsulation) in_out[2];
+			}
+
+		} catch (final SocksException s_ex) {
+			throw s_ex;
+		} catch (final UnknownHostException uh_ex) {
+			throw new SocksException(SOCKS_PROXY_NO_CONNECT, uh_ex);
+		} catch (final SocketException so_ex) {
+			throw new SocksException(SOCKS_PROXY_NO_CONNECT, so_ex);
+		} catch (final IOException io_ex) {
+			throw new SocksException(SOCKS_PROXY_IO_ERROR, io_ex);
+		}
+	}
+
+	protected ProxyMessage formMessage(int cmd, InetAddress ip, int port) {
+		return new Socks5Message(cmd, ip, port);
+	}
+
+	protected ProxyMessage formMessage(int cmd, String host, int port)
+			throws UnknownHostException {
+		if (resolveAddrLocally) {
+			return formMessage(cmd, InetAddress.getByName(host), port);
+		} else {
+			return new Socks5Message(cmd, host, port);
+		}
+	}
+
+	protected ProxyMessage formMessage(InputStream in) throws SocksException,
+			IOException {
+		return new Socks5Message(in);
+	}
+
+}

src/com/runjva/sourceforge/jsocks/protocol/SocksException.java

@@ -0,0 +1,111 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+/**
+ * Exception thrown by various socks classes to indicate errors with protocol or
+ * unsuccessfull server responses.
+ */
+public class SocksException extends java.io.IOException {
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * Construct a SocksException with given errorcode.
+	 * <p>
+	 * Tries to look up message which corresponds to this error code.
+	 * 
+	 * @param errCode
+	 *            Error code for this exception.
+	 */
+	public SocksException(int errCode) {
+		this.errCode = errCode;
+		lookupErrorString(errCode);
+	}
+
+	private void lookupErrorString(int errCode) {
+		if ((errCode >> 16) == 0) {
+			if (errCode <= serverReplyMessage.length) {
+				errString = serverReplyMessage[errCode];
+			} else {
+				errString = UNASSIGNED_ERROR_MESSAGE;
+			}
+		} else {
+			// Local error
+			errCode = (errCode >> 16) - 1;
+			if (errCode <= localErrorMessage.length) {
+				errString = localErrorMessage[errCode];
+			} else {
+				errString = UNASSIGNED_ERROR_MESSAGE;
+			}
+		}
+	}
+
+	/**
+	 * Construct a SocksException with given error code, and a Throwable cause
+	 * 
+	 * @param errCode
+	 * @param t
+	 *            Nested exception for debugging purposes.
+	 */
+	public SocksException(int errCode, Throwable t) {
+		super(t);  // Java 1.6+
+		this.errCode = errCode;
+		lookupErrorString(errCode);
+	}
+
+	/**
+	 * Constructs a SocksException with given error code and message.
+	 * 
+	 * @param errCode
+	 *            Error code.
+	 * @param errString
+	 *            Error Message.
+	 */
+	public SocksException(int errCode, String errString) {
+		this.errCode = errCode;
+		this.errString = errString;
+	}
+
+	public SocksException(int errCode, String string, Throwable t) {
+		super(string, t);  // Java 1.6+
+		this.errCode = errCode;
+		this.errString = string;
+	}
+
+	/**
+	 * Get the error code associated with this exception.
+	 * 
+	 * @return Error code associated with this exception.
+	 */
+	public int getErrorCode() {
+		return errCode;
+	}
+
+	/**
+	 * Get human readable representation of this exception.
+	 * 
+	 * @return String represntation of this exception.
+	 */
+	public String toString() {
+		return errString;
+	}
+
+	static final String UNASSIGNED_ERROR_MESSAGE = "Unknown error message";
+
+	static final String serverReplyMessage[] = { "Succeeded",
+			"General SOCKS server failure",
+			"Connection not allowed by ruleset", "Network unreachable",
+			"Host unreachable", "Connection refused", "TTL expired",
+			"Command not supported", "Address type not supported" };
+
+	static final String localErrorMessage[] = { "SOCKS server not specified",
+			"Unable to contact SOCKS server", "IO error",
+			"None of Authentication methods are supported",
+			"Authentication failed", "General SOCKS fault" };
+
+	String errString;
+	int errCode;
+
+}// End of SocksException class
+

src/com/runjva/sourceforge/jsocks/protocol/SocksProxyBase.java

@@ -0,0 +1,543 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InterruptedIOException;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.UnknownHostException;
+
+/**
+ * Abstract class Proxy, base for classes Socks4Proxy and Socks5Proxy. Defines
+ * methods for specifying default proxy, to be used by all classes of this
+ * package.
+ */
+
+public abstract class SocksProxyBase {
+
+	// Data members
+	protected InetRange directHosts = new InetRange();
+
+	protected InetAddress proxyIP = null;
+	protected String proxyHost = null;
+	protected int proxyPort;
+	protected Socket proxySocket = null;
+
+	protected InputStream in;
+	protected OutputStream out;
+
+	protected int version;
+
+	protected SocksProxyBase chainProxy = null;
+
+	// Protected static/class variables
+	protected static SocksProxyBase defaultProxy = null;
+
+	// Constructors
+	// ====================
+	SocksProxyBase(SocksProxyBase chainProxy, String proxyHost, int proxyPort)
+			throws UnknownHostException {
+		this.chainProxy = chainProxy;
+		this.proxyHost = proxyHost;
+
+		if (chainProxy == null) {
+			this.proxyIP = InetAddress.getByName(proxyHost);
+		}
+
+		this.proxyPort = proxyPort;
+	}
+
+	SocksProxyBase(String proxyHost, int proxyPort) throws UnknownHostException {
+		this(null, proxyHost, proxyPort);
+	}
+
+	SocksProxyBase(SocksProxyBase chainProxy, InetAddress proxyIP, int proxyPort) {
+		this.chainProxy = chainProxy;
+		this.proxyIP = proxyIP;
+		this.proxyPort = proxyPort;
+	}
+
+	SocksProxyBase(InetAddress proxyIP, int proxyPort) {
+		this(null, proxyIP, proxyPort);
+	}
+
+	SocksProxyBase(SocksProxyBase p) {
+		this.proxyIP = p.proxyIP;
+		this.proxyPort = p.proxyPort;
+		this.version = p.version;
+		this.directHosts = p.directHosts;
+	}
+
+	// Public instance methods
+	// ========================
+
+	/**
+	 * Get the port on which proxy server is running.
+	 * 
+	 * @return Proxy port.
+	 */
+	public int getPort() {
+		return proxyPort;
+	}
+
+	/**
+	 * Get the ip address of the proxy server host.
+	 * 
+	 * @return Proxy InetAddress.
+	 */
+	public InetAddress getInetAddress() {
+		return proxyIP;
+	}
+
+	/**
+	 * Adds given ip to the list of direct addresses. This machine will be
+	 * accessed without using proxy.
+	 */
+	public void addDirect(InetAddress ip) {
+		directHosts.add(ip);
+	}
+
+	/**
+	 * Adds host to the list of direct addresses. This machine will be accessed
+	 * without using proxy.
+	 */
+	public boolean addDirect(String host) {
+		return directHosts.add(host);
+	}
+
+	/**
+	 * Adds given range of addresses to the lsit of direct addresses, machines
+	 * within this range will be accessed without using proxy.
+	 */
+	public void addDirect(InetAddress from, InetAddress to) {
+		directHosts.add(from, to);
+	}
+
+	/**
+	 * Sets given InetRange as the list of direct address, previous list will be
+	 * discarded, any changes done previously with addDirect(Inetaddress) will
+	 * be lost. The machines in this range will be accessed without using proxy.
+	 * 
+	 * @param ir
+	 *            InetRange which should be used to look up direct addresses.
+	 * @see InetRange
+	 */
+	public void setDirect(InetRange ir) {
+		directHosts = ir;
+	}
+
+	/**
+	 * Get the list of direct hosts.
+	 * 
+	 * @return Current range of direct address as InetRange object.
+	 * @see InetRange
+	 */
+	public InetRange getDirect() {
+		return directHosts;
+	}
+
+	/**
+	 * Check wether the given host is on the list of direct address.
+	 * 
+	 * @param host
+	 *            Host name to check.
+	 * @return true if the given host is specified as the direct addresses.
+	 */
+	public boolean isDirect(String host) {
+		return directHosts.contains(host);
+	}
+
+	/**
+	 * Check wether the given host is on the list of direct addresses.
+	 * 
+	 * @param host
+	 *            Host address to check.
+	 * @return true if the given host is specified as the direct address.
+	 */
+	public boolean isDirect(InetAddress host) {
+		return directHosts.contains(host);
+	}
+
+	/**
+	 * Set the proxy which should be used to connect to given proxy.
+	 * 
+	 * @param chainProxy
+	 *            Proxy to use to connect to this proxy.
+	 */
+	public void setChainProxy(SocksProxyBase chainProxy) {
+		this.chainProxy = chainProxy;
+	}
+
+	/**
+	 * Get proxy which is used to connect to this proxy.
+	 * 
+	 * @return Proxy which is used to connect to this proxy, or null if proxy is
+	 *         to be contacted directly.
+	 */
+	public SocksProxyBase getChainProxy() {
+		return chainProxy;
+	}
+
+	/**
+	 * Get string representation of this proxy.
+	 * 
+	 * @returns string in the form:proxyHost:proxyPort \t Version versionNumber
+	 */
+	public String toString() {
+		return ("" + proxyIP.getHostName() + ":" + proxyPort + "\tVersion " + version);
+	}
+
+	// Public Static(Class) Methods
+	// ==============================
+
+	/**
+	 * Sets SOCKS4 proxy as default.
+	 * 
+	 * @param hostName
+	 *            Host name on which SOCKS4 server is running.
+	 * @param port
+	 *            Port on which SOCKS4 server is running.
+	 * @param user
+	 *            Username to use for communications with proxy.
+	 */
+	public static void setDefaultProxy(String hostName, int port, String user)
+			throws UnknownHostException {
+		defaultProxy = new Socks4Proxy(hostName, port, user);
+	}
+
+	/**
+	 * Sets SOCKS4 proxy as default.
+	 * 
+	 * @param ipAddress
+	 *            Host address on which SOCKS4 server is running.
+	 * @param port
+	 *            Port on which SOCKS4 server is running.
+	 * @param user
+	 *            Username to use for communications with proxy.
+	 */
+	public static void setDefaultProxy(InetAddress ipAddress, int port,
+			String user) {
+		defaultProxy = new Socks4Proxy(ipAddress, port, user);
+	}
+
+	/**
+	 * Sets SOCKS5 proxy as default. Default proxy only supports
+	 * no-authentication.
+	 * 
+	 * @param hostName
+	 *            Host name on which SOCKS5 server is running.
+	 * @param port
+	 *            Port on which SOCKS5 server is running.
+	 */
+	public static void setDefaultProxy(String hostName, int port)
+			throws UnknownHostException {
+		defaultProxy = new Socks5Proxy(hostName, port);
+	}
+
+	/**
+	 * Sets SOCKS5 proxy as default. Default proxy only supports
+	 * no-authentication.
+	 * 
+	 * @param ipAddress
+	 *            Host address on which SOCKS5 server is running.
+	 * @param port
+	 *            Port on which SOCKS5 server is running.
+	 */
+	public static void setDefaultProxy(InetAddress ipAddress, int port) {
+		defaultProxy = new Socks5Proxy(ipAddress, port);
+	}
+
+	/**
+	 * Sets default proxy.
+	 * 
+	 * @param p
+	 *            Proxy to use as default proxy.
+	 */
+	public static void setDefaultProxy(SocksProxyBase p) {
+		defaultProxy = p;
+	}
+
+	/**
+	 * Get current default proxy.
+	 * 
+	 * @return Current default proxy, or null if none is set.
+	 */
+	public static SocksProxyBase getDefaultProxy() {
+		return defaultProxy;
+	}
+
+	/**
+	 * Parses strings in the form: host[:port:user:password], and creates proxy
+	 * from information obtained from parsing.
+	 * <p>
+	 * Defaults: port = 1080.<br>
+	 * If user specified but not password, creates Socks4Proxy, if user not
+	 * specified creates Socks5Proxy, if both user and password are speciefied
+	 * creates Socks5Proxy with user/password authentication.
+	 * 
+	 * @param proxy_entry
+	 *            String in the form host[:port:user:password]
+	 * @return Proxy created from the string, null if entry was somehow
+	 *         invalid(host unknown for example, or empty string)
+	 */
+	public static SocksProxyBase parseProxy(String proxy_entry) {
+
+		String proxy_host;
+		int proxy_port = 1080;
+		String proxy_user = null;
+		String proxy_password = null;
+		SocksProxyBase proxy;
+
+		final java.util.StringTokenizer st = new java.util.StringTokenizer(
+				proxy_entry, ":");
+		if (st.countTokens() < 1) {
+			return null;
+		}
+
+		proxy_host = st.nextToken();
+		if (st.hasMoreTokens()) {
+			try {
+				proxy_port = Integer.parseInt(st.nextToken().trim());
+			} catch (final NumberFormatException nfe) {
+			}
+		}
+
+		if (st.hasMoreTokens()) {
+			proxy_user = st.nextToken();
+		}
+
+		if (st.hasMoreTokens()) {
+			proxy_password = st.nextToken();
+		}
+
+		try {
+			if (proxy_user == null) {
+				proxy = new Socks5Proxy(proxy_host, proxy_port);
+			} else if (proxy_password == null) {
+				proxy = new Socks4Proxy(proxy_host, proxy_port, proxy_user);
+			} else {
+				proxy = new Socks5Proxy(proxy_host, proxy_port);
+				final UserPasswordAuthentication upa = new UserPasswordAuthentication(
+						proxy_user, proxy_password);
+
+				((Socks5Proxy) proxy).setAuthenticationMethod(
+						UserPasswordAuthentication.METHOD_ID, upa);
+			}
+		} catch (final UnknownHostException uhe) {
+			return null;
+		}
+
+		return proxy;
+	}
+
+	// Protected Methods
+	// =================
+
+	protected void startSession() throws SocksException {
+		try {
+			if (chainProxy == null) {
+				proxySocket = new Socket(proxyIP, proxyPort);
+			} else if (proxyIP != null) {
+				proxySocket = new SocksSocket(chainProxy, proxyIP, proxyPort);
+			} else {
+				proxySocket = new SocksSocket(chainProxy, proxyHost, proxyPort);
+			}
+
+			in = proxySocket.getInputStream();
+			out = proxySocket.getOutputStream();
+		} catch (final SocksException se) {
+			throw se;
+		} catch (final IOException io_ex) {
+			throw new SocksException(SOCKS_PROXY_IO_ERROR, "" + io_ex);
+		}
+	}
+
+	/**
+	 * Create a copy of this proxy for use by individual threads.
+	 * 
+	 * @return proxy
+	 */
+	protected abstract SocksProxyBase copy();
+
+	protected abstract ProxyMessage formMessage(int cmd, InetAddress ip,
+			int port);
+
+	protected abstract ProxyMessage formMessage(int cmd, String host, int port)
+			throws UnknownHostException;
+
+	protected abstract ProxyMessage formMessage(InputStream in)
+			throws SocksException, IOException;
+
+	protected ProxyMessage connect(InetAddress ip, int port)
+			throws SocksException {
+		try {
+			startSession();
+			final ProxyMessage request = formMessage(SOCKS_CMD_CONNECT, ip,
+					port);
+			return exchange(request);
+		} catch (final SocksException se) {
+			endSession();
+			throw se;
+		}
+	}
+
+	protected ProxyMessage connect(String host, int port)
+			throws UnknownHostException, SocksException {
+		try {
+			startSession();
+			final ProxyMessage request = formMessage(SOCKS_CMD_CONNECT, host,
+					port);
+			return exchange(request);
+		} catch (final SocksException se) {
+			endSession();
+			throw se;
+		}
+	}
+
+	protected ProxyMessage bind(InetAddress ip, int port) throws SocksException {
+		try {
+			startSession();
+			final ProxyMessage request = formMessage(SOCKS_CMD_BIND, ip, port);
+			return exchange(request);
+		} catch (final SocksException se) {
+			endSession();
+			throw se;
+		}
+	}
+
+	protected ProxyMessage bind(String host, int port)
+			throws UnknownHostException, SocksException {
+		try {
+			startSession();
+			final ProxyMessage request = formMessage(SOCKS_CMD_BIND, host, port);
+			return exchange(request);
+		} catch (final SocksException se) {
+			endSession();
+			throw se;
+		}
+	}
+
+	protected ProxyMessage accept() throws IOException, SocksException {
+		ProxyMessage msg;
+		try {
+			msg = formMessage(in);
+		} catch (final InterruptedIOException iioe) {
+			throw iioe;
+		} catch (final IOException io_ex) {
+			endSession();
+			throw new SocksException(SOCKS_PROXY_IO_ERROR,
+					"While Trying accept:" + io_ex);
+		}
+		return msg;
+	}
+
+	protected ProxyMessage udpAssociate(InetAddress ip, int port)
+			throws SocksException {
+		try {
+			startSession();
+			final ProxyMessage request = formMessage(SOCKS_CMD_UDP_ASSOCIATE,
+					ip, port);
+			if (request != null) {
+				return exchange(request);
+			}
+		} catch (final SocksException se) {
+			endSession();
+			throw se;
+		}
+		// Only get here if request was null
+		endSession();
+		throw new SocksException(SOCKS_METHOD_NOTSUPPORTED,
+				"This version of proxy does not support UDP associate, use version 5");
+	}
+
+	protected ProxyMessage udpAssociate(String host, int port)
+			throws UnknownHostException, SocksException {
+		try {
+			startSession();
+			final ProxyMessage request = formMessage(SOCKS_CMD_UDP_ASSOCIATE,
+					host, port);
+			if (request != null) {
+				return exchange(request);
+			}
+		} catch (final SocksException se) {
+			endSession();
+			throw se;
+		}
+		// Only get here if request was null
+		endSession();
+		throw new SocksException(SOCKS_METHOD_NOTSUPPORTED,
+				"This version of proxy does not support UDP associate, use version 5");
+	}
+
+	protected void endSession() {
+		try {
+			if (proxySocket != null) {
+				proxySocket.close();
+			}
+			proxySocket = null;
+		} catch (final IOException io_ex) {
+		}
+	}
+
+	/**
+	 *Sends the request to SOCKS server
+	 */
+	protected void sendMsg(ProxyMessage msg) throws SocksException, IOException {
+		msg.write(out);
+	}
+
+	/**
+	 * Reads the reply from the SOCKS server
+	 */
+	protected ProxyMessage readMsg() throws SocksException, IOException {
+		return formMessage(in);
+	}
+
+	/**
+	 *Sends the request reads reply and returns it throws exception if
+	 * something wrong with IO or the reply code is not zero
+	 */
+	protected ProxyMessage exchange(ProxyMessage request) throws SocksException {
+		ProxyMessage reply;
+		try {
+			request.write(out);
+			reply = formMessage(in);
+		} catch (final SocksException s_ex) {
+			throw s_ex;
+		} catch (final IOException ioe) {
+			throw (new SocksException(SOCKS_PROXY_IO_ERROR, "" + ioe));
+		}
+		return reply;
+	}
+
+	// Private methods
+	// ===============
+
+	// Constants
+
+	public static final int SOCKS_SUCCESS = 0;
+	public static final int SOCKS_FAILURE = 1;
+	public static final int SOCKS_BADCONNECT = 2;
+	public static final int SOCKS_BADNETWORK = 3;
+	public static final int SOCKS_HOST_UNREACHABLE = 4;
+	public static final int SOCKS_CONNECTION_REFUSED = 5;
+	public static final int SOCKS_TTL_EXPIRE = 6;
+	public static final int SOCKS_CMD_NOT_SUPPORTED = 7;
+	public static final int SOCKS_ADDR_NOT_SUPPORTED = 8;
+
+	public static final int SOCKS_NO_PROXY = 1 << 16;
+	public static final int SOCKS_PROXY_NO_CONNECT = 2 << 16;
+	public static final int SOCKS_PROXY_IO_ERROR = 3 << 16;
+	public static final int SOCKS_AUTH_NOT_SUPPORTED = 4 << 16;
+	public static final int SOCKS_AUTH_FAILURE = 5 << 16;
+	public static final int SOCKS_JUST_ERROR = 6 << 16;
+
+	public static final int SOCKS_DIRECT_FAILED = 7 << 16;
+	public static final int SOCKS_METHOD_NOTSUPPORTED = 8 << 16;
+
+	static final int SOCKS_CMD_CONNECT = 0x1;
+	static final int SOCKS_CMD_BIND = 0x2;
+	static final int SOCKS_CMD_UDP_ASSOCIATE = 0x3;
+
+}

src/com/runjva/sourceforge/jsocks/protocol/SocksServerSocket.java

@@ -0,0 +1,238 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+
+/**
+ * SocksServerSocket allows to accept connections from one particular host
+ * through the SOCKS4 or SOCKS5 proxy.
+ */
+public class SocksServerSocket extends ServerSocket {
+	// Data members
+	protected SocksProxyBase proxy;
+	protected String localHost;
+	protected InetAddress localIP;
+	protected int localPort;
+
+	boolean doing_direct = false;
+	InetAddress remoteAddr;
+
+	/**
+	 * Creates ServerSocket capable of accepting one connection through the
+	 * firewall, uses default Proxy.
+	 * 
+	 * @param host
+	 *            Host from which the connection should be recieved.
+	 *@param port
+	 *            Port number of the primary connection.
+	 */
+	public SocksServerSocket(String host, int port) throws SocksException,
+			UnknownHostException, IOException {
+		this(SocksProxyBase.defaultProxy, host, port);
+	}
+
+	/**
+	 *Creates ServerSocket capable of accepting one connection through the
+	 * firewall, uses given proxy.
+	 * 
+	 * @param p
+	 *            Proxy object to use.
+	 *@param host
+	 *            Host from which the connection should be recieved.
+	 *@param port
+	 *            Port number of the primary connection.
+	 */
+	public SocksServerSocket(SocksProxyBase p, String host, int port)
+			throws SocksException, UnknownHostException, IOException {
+
+		super(0);
+		if (p == null) {
+			throw new SocksException(SocksProxyBase.SOCKS_NO_PROXY);
+		}
+		// proxy=p;
+		proxy = p.copy();
+		if (proxy.isDirect(host)) {
+			remoteAddr = InetAddress.getByName(host);
+			proxy = null;
+			doDirect();
+		} else {
+			processReply(proxy.bind(host, port));
+		}
+	}
+
+	/**
+	 * Creates ServerSocket capable of accepting one connection through the
+	 * firewall, uses default Proxy.
+	 * 
+	 * @param ip
+	 *            Host from which the connection should be recieved.
+	 *@param port
+	 *            Port number of the primary connection.
+	 */
+	public SocksServerSocket(InetAddress ip, int port) throws SocksException,
+			IOException {
+		this(SocksProxyBase.defaultProxy, ip, port);
+	}
+
+	/**
+	 *Creates ServerSocket capable of accepting one connection through the
+	 * firewall, uses given proxy.
+	 * 
+	 * @param p
+	 *            Proxy object to use.
+	 *@param ip
+	 *            Host from which the connection should be recieved.
+	 *@param port
+	 *            Port number of the primary connection.
+	 */
+	public SocksServerSocket(SocksProxyBase p, InetAddress ip, int port)
+			throws SocksException, IOException {
+		super(0);
+
+		if (p == null) {
+			throw new SocksException(SocksProxyBase.SOCKS_NO_PROXY);
+		}
+		this.proxy = p.copy();
+
+		if (proxy.isDirect(ip)) {
+			remoteAddr = ip;
+			doDirect();
+		} else {
+			processReply(proxy.bind(ip, port));
+		}
+	}
+
+	/**
+	 * Accepts the incoming connection.
+	 */
+	public Socket accept() throws IOException {
+		Socket s;
+
+		if (!doing_direct) {
+			if (proxy == null) {
+				return null;
+			}
+
+			final ProxyMessage msg = proxy.accept();
+			s = msg.ip == null ? new SocksSocket(msg.host, msg.port, proxy)
+					: new SocksSocket(msg.ip, msg.port, proxy);
+			// Set timeout back to 0
+			proxy.proxySocket.setSoTimeout(0);
+			if (ProxyServer.vpnService != null)
+				ProxyServer.vpnService.protect(proxy.proxySocket);
+			
+		} else { // Direct Connection
+
+			// Mimic the proxy behaviour,
+			// only accept connections from the speciefed host.
+			while (true) {
+				s = super.accept();
+				if (s.getInetAddress().equals(remoteAddr)) {
+					// got the connection from the right host
+					// Close listenning socket.
+					break;
+				} else {
+					s.close(); // Drop all connections from other hosts
+				}
+			}
+
+		}
+		proxy = null;
+		// Return accepted socket
+		return s;
+	}
+
+	/**
+	 * Closes the connection to proxy if socket have not been accepted, if the
+	 * direct connection is used, closes direct ServerSocket. If the client
+	 * socket have been allready accepted, does nothing.
+	 */
+	public void close() throws IOException {
+		super.close();
+		if (proxy != null) {
+			proxy.endSession();
+		}
+		proxy = null;
+	}
+
+	/**
+	 * Get the name of the host proxy is using to listen for incoming
+	 * connection.
+	 * <P>
+	 * Usefull when address is returned by proxy as the hostname.
+	 * 
+	 * @return the hostname of the address proxy is using to listen for incoming
+	 *         connection.
+	 */
+	public String getHost() {
+		return localHost;
+	}
+
+	/**
+	 * Get address assigned by proxy to listen for incomming connections, or the
+	 * local machine address if doing direct connection.
+	 */
+	public InetAddress getInetAddress() {
+		if (localIP == null) {
+			try {
+				localIP = InetAddress.getByName(localHost);
+			} catch (final UnknownHostException e) {
+				return null;
+			}
+		}
+		return localIP;
+	}
+
+	/**
+	 * Get port assigned by proxy to listen for incoming connections, or the
+	 * port chosen by local system, if accepting directly.
+	 */
+	public int getLocalPort() {
+		return localPort;
+	}
+
+	/**
+	 * Set Timeout.
+	 * 
+	 * @param timeout
+	 *            Amount of time in milliseconds, accept should wait for
+	 *            incoming connection before failing with exception. Zero
+	 *            timeout implies infinity.
+	 */
+	public void setSoTimeout(int timeout) throws SocketException {
+		super.setSoTimeout(timeout);
+		if (!doing_direct) {
+			proxy.proxySocket.setSoTimeout(timeout);
+		}
+	}
+
+	// Private Methods
+	// ////////////////
+
+	private void processReply(ProxyMessage reply) throws SocksException {
+		localPort = reply.port;
+		/*
+		 * If the server have assigned same host as it was contacted on it might
+		 * return an address of all zeros
+		 */
+		if (reply.host.equals("0.0.0.0")) {
+			localIP = proxy.proxyIP;
+			localHost = localIP.getHostName();
+		} else {
+			localHost = reply.host;
+			localIP = reply.ip;
+		}
+	}
+
+	private void doDirect() {
+		doing_direct = true;
+		localPort = super.getLocalPort();
+		localIP = super.getInetAddress();
+		localHost = localIP.getHostName();
+	}
+
+}

src/com/runjva/sourceforge/jsocks/protocol/SocksSocket.java

@@ -0,0 +1,389 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * SocksSocket tryies to look very similar to normal Socket, while allowing
+ * connections through the SOCKS4 or 5 proxy. To use this class you will have to
+ * identify proxy you need to use, Proxy class allows you to set default proxy,
+ * which will be used by all Socks aware sockets. You can also create either
+ * Socks4Proxy or Socks5Proxy, and use them by passing to the appropriate
+ * constructors.
+ * <P>
+ * Using Socks package can be as easy as that:
+ * 
+ * <pre>
+ * &lt;tt&gt;
+ * 
+ *     import Socks.*;
+ *     ....
+ * 
+ *     try{
+ *        //Specify SOCKS5 proxy
+ *        Proxy.setDefaultProxy(&quot;socks-proxy&quot;,1080);
+ * 
+ *        //OR you still use SOCKS4
+ *        //Code below uses SOCKS4 proxy
+ *        //Proxy.setDefaultProxy(&quot;socks-proxy&quot;,1080,userName);
+ * 
+ *        Socket s = SocksSocket(&quot;some.host.of.mine&quot;,13);
+ *        readTimeFromSock(s);
+ *     }catch(SocksException sock_ex){
+ *        //Usually it will turn in more or less meaningfull message
+ *        System.err.println(&quot;SocksException:&quot;+sock_ex);
+ *     }
+ * 
+ * &lt;/tt&gt;
+ * </pre>
+ *<P>
+ * However if the need exist for more control, like resolving addresses
+ * remotely, or using some non-trivial authentication schemes, it can be done.
+ */
+
+public class SocksSocket extends Socket {
+	// Data members
+	protected SocksProxyBase proxy;
+	protected String localHost, remoteHost;
+	protected InetAddress localIP, remoteIP;
+	protected int localPort, remotePort;
+
+	private Socket directSock = null;
+	private Logger log = LoggerFactory.getLogger(SocksSocket.class);
+
+	/**
+	 * Tryies to connect to given host and port using default proxy. If no
+	 * default proxy speciefied it throws SocksException with error code
+	 * SOCKS_NO_PROXY.
+	 * 
+	 * @param host
+	 *            Machine to connect to.
+	 * @param port
+	 *            Port to which to connect.
+	 * @see SocksSocket#SocksSocket(SocksProxyBase,String,int)
+	 * @see Socks5Proxy#resolveAddrLocally
+	 */
+	public SocksSocket(String host, int port) throws SocksException,
+			UnknownHostException {
+		this(SocksProxyBase.defaultProxy, host, port);
+	}
+
+	/**
+	 * Connects to host port using given proxy server.
+	 * 
+	 * @param p
+	 *            Proxy to use.
+	 * @param host
+	 *            Machine to connect to.
+	 * @param port
+	 *            Port to which to connect.
+	 * @throws UnknownHostException
+	 *             If one of the following happens:
+	 *             <ol>
+	 * 
+	 *             <li>Proxy settings say that address should be resolved
+	 *             locally, but this fails.
+	 *             <li>Proxy settings say that the host should be contacted
+	 *             directly but host name can't be resolved.
+	 *             </ol>
+	 * @throws SocksException
+	 *             If one of the following happens:
+	 *             <ul>
+	 *             <li>Proxy is is null.
+	 *             <li>Proxy settings say that the host should be contacted
+	 *             directly but this fails.
+	 *             <li>Socks Server can't be contacted.
+	 *             <li>Authentication fails.
+	 *             <li>Connection is not allowed by the SOCKS proxy.
+	 *             <li>SOCKS proxy can't establish the connection.
+	 *             <li>Any IO error occured.
+	 *             <li>Any protocol error occured.
+	 *             </ul>
+	 * @throws IOexception
+	 *             if anything is wrong with I/O.
+	 * @see Socks5Proxy#resolveAddrLocally
+	 */
+	public SocksSocket(SocksProxyBase p, String host, int port)
+			throws SocksException, UnknownHostException {
+
+		if (p == null) {
+			throw new SocksException(SocksProxyBase.SOCKS_NO_PROXY);
+		}
+		// proxy=p;
+		proxy = p.copy();
+		remoteHost = host;
+		remotePort = port;
+		if (proxy.isDirect(host)) {
+			remoteIP = InetAddress.getByName(host);
+			doDirect();
+		} else {
+			processReply(proxy.connect(host, port));
+		}
+	}
+
+	/**
+	 * Tryies to connect to given ip and port using default proxy. If no default
+	 * proxy speciefied it throws SocksException with error code SOCKS_NO_PROXY.
+	 * 
+	 * @param ip
+	 *            Machine to connect to.
+	 * @param port
+	 *            Port to which to connect.
+	 * @see SocksSocket#SocksSocket(SocksProxyBase,String,int)
+	 */
+	public SocksSocket(InetAddress ip, int port) throws SocksException {
+		this(SocksProxyBase.defaultProxy, ip, port);
+	}
+
+	/**
+	 * Connects to given ip and port using given Proxy server.
+	 * 
+	 * @param p
+	 *            Proxy to use.
+	 * @param ip
+	 *            Machine to connect to.
+	 * @param port
+	 *            Port to which to connect.
+	 */
+	public SocksSocket(SocksProxyBase p, InetAddress ip, int port)
+			throws SocksException {
+		if (p == null) {
+			throw new SocksException(SocksProxyBase.SOCKS_NO_PROXY);
+		}
+		this.proxy = p.copy();
+		this.remoteIP = ip;
+		this.remotePort = port;
+		this.remoteHost = ip.getHostName();
+		if (proxy.isDirect(remoteIP)) {
+			doDirect();
+		} else {
+			processReply(proxy.connect(ip, port));
+		}
+	}
+
+	/**
+	 * These 2 constructors are used by the SocksServerSocket. This socket
+	 * simply overrides remoteHost, remotePort
+	 */
+	protected SocksSocket(String host, int port, SocksProxyBase proxy) {
+		this.remotePort = port;
+		this.proxy = proxy;
+		this.localIP = proxy.proxySocket.getLocalAddress();
+		this.localPort = proxy.proxySocket.getLocalPort();
+		this.remoteHost = host;
+	}
+
+	protected SocksSocket(InetAddress ip, int port, SocksProxyBase proxy) {
+		remoteIP = ip;
+		remotePort = port;
+		this.proxy = proxy;
+		this.localIP = proxy.proxySocket.getLocalAddress();
+		this.localPort = proxy.proxySocket.getLocalPort();
+		remoteHost = remoteIP.getHostName();
+	}
+
+	/**
+	 * Same as Socket
+	 */
+	public void close() throws IOException {
+		if (proxy != null) {
+			proxy.endSession();
+		}
+		proxy = null;
+	}
+
+	/**
+	 * Same as Socket
+	 */
+	public InputStream getInputStream() {
+		return proxy.in;
+	}
+
+	/**
+	 * Same as Socket
+	 */
+	public OutputStream getOutputStream() {
+		return proxy.out;
+	}
+
+	/**
+	 * Same as Socket
+	 */
+	public int getPort() {
+		return remotePort;
+	}
+
+	/**
+	 * Returns remote host name, it is usefull in cases when addresses are
+	 * resolved by proxy, and we can't create InetAddress object.
+	 * 
+	 * @return The name of the host this socket is connected to.
+	 */
+	public String getHost() {
+		return remoteHost;
+	}
+
+	/**
+	 * Get remote host as InetAddress object, might return null if addresses are
+	 * resolved by proxy, and it is not possible to resolve it locally
+	 * 
+	 * @return Ip address of the host this socket is connected to, or null if
+	 *         address was returned by the proxy as DOMAINNAME and can't be
+	 *         resolved locally.
+	 */
+	public InetAddress getInetAddress() {
+		if (remoteIP == null) {
+			try {
+				remoteIP = InetAddress.getByName(remoteHost);
+			} catch (final UnknownHostException e) {
+				return null;
+			}
+		}
+		return remoteIP;
+	}
+
+	/**
+	 * Get the port assigned by the proxy for the socket, not the port on locall
+	 * machine as in Socket.
+	 * 
+	 * @return Port of the socket used on the proxy server.
+	 */
+	public int getLocalPort() {
+		return localPort;
+	}
+
+	/**
+	 * Get address assigned by proxy to make a remote connection, it might be
+	 * different from the host specified for the proxy. Can return null if socks
+	 * server returned this address as hostname and it can't be resolved
+	 * locally, use getLocalHost() then.
+	 * 
+	 * @return Address proxy is using to make a connection.
+	 */
+	public InetAddress getLocalAddress() {
+		if (localIP == null) {
+			try {
+				localIP = InetAddress.getByName(localHost);
+			} catch (final UnknownHostException e) {
+				return null;
+			}
+		}
+		return localIP;
+	}
+
+	/**
+	 * Get name of the host, proxy has assigned to make a remote connection for
+	 * this socket. This method is usefull when proxy have returned address as
+	 * hostname, and we can't resolve it on this machine.
+	 * 
+	 * @return The name of the host proxy is using to make a connection.
+	 */
+	public String getLocalHost() {
+		return localHost;
+	}
+
+	/**
+	 * Same as socket.
+	 */
+	public void setSoLinger(boolean on, int val) throws SocketException {
+		proxy.proxySocket.setSoLinger(on, val);
+	}
+
+	/**
+	 * Same as socket.
+	 */
+	public int getSoLinger(int timeout) throws SocketException {
+		return proxy.proxySocket.getSoLinger();
+	}
+
+	/**
+	 * Same as socket.
+	 */
+	public void setSoTimeout(int timeout) throws SocketException {
+		proxy.proxySocket.setSoTimeout(timeout);
+	}
+
+	/**
+	 * Same as socket.
+	 */
+	public int getSoTimeout(int timeout) throws SocketException {
+		return proxy.proxySocket.getSoTimeout();
+	}
+
+	/**
+	 * Same as socket.
+	 */
+	public void setTcpNoDelay(boolean on) throws SocketException {
+		proxy.proxySocket.setTcpNoDelay(on);
+	}
+
+	/**
+	 * Same as socket.
+	 */
+	public boolean getTcpNoDelay() throws SocketException {
+		return proxy.proxySocket.getTcpNoDelay();
+	}
+
+	/**
+	 * Get string representation of the socket.
+	 */
+	public String toString() {
+		if (directSock != null) {
+			return "Direct connection:" + directSock;
+		}
+		StringBuffer sb = new StringBuffer();
+		sb.append("Proxy:");
+		sb.append(proxy);
+		sb.append(";");
+		sb.append("addr:");
+		sb.append(remoteHost);
+		sb.append(",port:");
+		sb.append(remotePort);
+		sb.append(",localport:");
+		sb.append(localPort);
+		return sb.toString();
+
+	}
+
+	// Private Methods
+	// ////////////////
+
+	private void processReply(ProxyMessage reply) throws SocksException {
+		localPort = reply.port;
+		/*
+		 * If the server have assigned same host as it was contacted on it might
+		 * return an address of all zeros
+		 */
+		if (reply.host.equals("0.0.0.0")) {
+			localIP = proxy.proxyIP;
+			localHost = localIP.getHostName();
+		} else {
+			localHost = reply.host;
+			localIP = reply.ip;
+		}
+	}
+
+	private void doDirect() throws SocksException {
+		try {
+			log.debug("IP: {}_{}", remoteIP, remotePort);
+			directSock = new Socket(remoteIP, remotePort);
+			proxy.out = directSock.getOutputStream();
+			proxy.in = directSock.getInputStream();
+			proxy.proxySocket = directSock;
+			localIP = directSock.getLocalAddress();
+			localPort = directSock.getLocalPort();
+		} catch (final IOException io_ex) {
+			final int errCode = SocksProxyBase.SOCKS_DIRECT_FAILED;
+			throw new SocksException(errCode, "Direct connect failed:", io_ex);
+		}
+	}
+
+}

src/com/runjva/sourceforge/jsocks/protocol/UDPEncapsulation.java

@@ -0,0 +1,33 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+/**
+ * This interface provides for datagram encapsulation for SOCKSv5 protocol.
+ * <p>
+ * SOCKSv5 allows for datagrams to be encapsulated for purposes of integrity
+ * and/or authenticity. How it should be done is aggreed during the
+ * authentication stage, and is authentication dependent. This interface is
+ * provided to allow this encapsulation.
+ * 
+ * @see Authentication
+ */
+public interface UDPEncapsulation {
+
+	/**
+	 * This method should provide any authentication depended transformation on
+	 * datagrams being send from/to the client.
+	 * 
+	 * @param data
+	 *            Datagram data (including any SOCKS related bytes), to be
+	 *            encapsulated/decapsulated.
+	 * @param out
+	 *            Wether the data is being send out. If true method should
+	 *            encapsulate/encrypt data, otherwise it should decapsulate/
+	 *            decrypt data.
+	 * @throw IOException if for some reason data can be transformed correctly.
+	 * @return Should return byte array containing data after transformation. It
+	 *         is possible to return same array as input, if transformation only
+	 *         involves bit mangling, and no additional data is being added or
+	 *         removed.
+	 */
+	byte[] udpEncapsulate(byte[] data, boolean out) throws java.io.IOException;
+}

src/com/runjva/sourceforge/jsocks/protocol/UDPRelayServer.java

@@ -0,0 +1,231 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.UnknownHostException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.runjva.sourceforge.jsocks.server.ServerAuthenticator;
+
+/**
+ * UDP Relay server, used by ProxyServer to perform udp forwarding.
+ */
+class UDPRelayServer implements Runnable {
+
+	DatagramSocket client_sock;
+	DatagramSocket remote_sock;
+
+	Socket controlConnection;
+
+	int relayPort;
+	InetAddress relayIP;
+
+	Thread pipe_thread1, pipe_thread2;
+	Thread master_thread;
+
+	ServerAuthenticator auth;
+
+	long lastReadTime;
+
+	static Logger log = LoggerFactory.getLogger(UDPRelayServer.class);
+	static SocksProxyBase proxy = null;
+	static int datagramSize = 0xFFFF;// 64K, a bit more than max udp size
+	static int iddleTimeout = 180000;// 3 minutes
+
+	/**
+	 * Constructs UDP relay server to communicate with client on given ip and
+	 * port.
+	 * 
+	 * @param clientIP
+	 *            Address of the client from whom datagrams will be recieved and
+	 *            to whom they will be forwarded.
+	 * @param clientPort
+	 *            Clients port.
+	 * @param master_thread
+	 *            Thread which will be interrupted, when UDP relay server
+	 *            stoppes for some reason.
+	 * @param controlConnection
+	 *            Socket which will be closed, before interrupting the master
+	 *            thread, it is introduced due to a bug in windows JVM which
+	 *            does not throw InterruptedIOException in threads which block
+	 *            in I/O operation.
+	 */
+	public UDPRelayServer(InetAddress clientIP, int clientPort,
+			Thread master_thread, Socket controlConnection,
+			ServerAuthenticator auth) throws IOException {
+
+		this.master_thread = master_thread;
+		this.controlConnection = controlConnection;
+		this.auth = auth;
+
+		client_sock = new Socks5DatagramSocket(true,
+				auth.getUdpEncapsulation(), clientIP, clientPort);
+
+		relayPort = client_sock.getLocalPort();
+		relayIP = client_sock.getLocalAddress();
+
+		if (relayIP.getHostAddress().equals("0.0.0.0")) {
+			relayIP = InetAddress.getLocalHost();
+		}
+
+		if (proxy == null) {
+			remote_sock = new DatagramSocket();
+		} else {
+			remote_sock = new Socks5DatagramSocket(proxy, 0, null);
+		}
+	}
+
+	// Public methods
+	// ///////////////
+
+	/**
+	 * Sets the timeout for UDPRelay server.<br>
+	 * Zero timeout implies infinity.<br>
+	 * Default timeout is 3 minutes.
+	 */
+
+	static public void setTimeout(int timeout) {
+		iddleTimeout = timeout;
+	}
+
+	/**
+	 * Sets the size of the datagrams used in the UDPRelayServer.<br>
+	 * Default size is 64K, a bit more than maximum possible size of the
+	 * datagram.
+	 */
+	static public void setDatagramSize(int size) {
+		datagramSize = size;
+	}
+
+	/**
+	 * Port to which client should send datagram for association.
+	 */
+	public int getRelayPort() {
+		return relayPort;
+	}
+
+	/**
+	 * IP address to which client should send datagrams for association.
+	 */
+	public InetAddress getRelayIP() {
+		return relayIP;
+	}
+
+	/**
+	 * Starts udp relay server. Spawns two threads of execution and returns.
+	 */
+	public void start() throws IOException {
+		remote_sock.setSoTimeout(iddleTimeout);
+		client_sock.setSoTimeout(iddleTimeout);
+
+		log.info("Starting UDP relay server on {}:{}", relayIP, relayPort);
+		log.info("Remote socket {}:{}", remote_sock.getLocalAddress(),
+				remote_sock.getLocalPort());
+
+		pipe_thread1 = new Thread(this, "pipe1");
+		pipe_thread2 = new Thread(this, "pipe2");
+
+		lastReadTime = System.currentTimeMillis();
+
+		pipe_thread1.start();
+		pipe_thread2.start();
+	}
+
+	/**
+	 * Stops Relay server.
+	 * <p>
+	 * Does not close control connection, does not interrupt master_thread.
+	 */
+	public synchronized void stop() {
+		master_thread = null;
+		controlConnection = null;
+		abort();
+	}
+
+	// Runnable interface
+	// //////////////////
+	public void run() {
+		try {
+			if (Thread.currentThread().getName().equals("pipe1")) {
+				pipe(remote_sock, client_sock, false);
+			} else {
+				pipe(client_sock, remote_sock, true);
+			}
+		} catch (final IOException ioe) {
+		} finally {
+			abort();
+			log.info("UDP Pipe thread " + Thread.currentThread().getName()
+					+ " stopped.");
+		}
+
+	}
+
+	// Private methods
+	// ///////////////
+	private synchronized void abort() {
+		if (pipe_thread1 == null) {
+			return;
+		}
+
+		log.info("Aborting UDP Relay Server");
+
+		remote_sock.close();
+		client_sock.close();
+
+		if (controlConnection != null) {
+			try {
+				controlConnection.close();
+			} catch (final IOException ioe) {
+			}
+		}
+
+		if (master_thread != null) {
+			master_thread.interrupt();
+		}
+
+		pipe_thread1.interrupt();
+		pipe_thread2.interrupt();
+
+		pipe_thread1 = null;
+	}
+
+	private void pipe(DatagramSocket from, DatagramSocket to, boolean out)
+			throws IOException {
+		final byte[] data = new byte[datagramSize];
+		final DatagramPacket dp = new DatagramPacket(data, data.length);
+
+		while (true) {
+			try {
+				from.receive(dp);
+				lastReadTime = System.currentTimeMillis();
+
+				if (auth.checkRequest(dp, out)) {
+					to.send(dp);
+				}
+
+			} catch (final UnknownHostException uhe) {
+				log.info("Dropping datagram for unknown host");
+			} catch (final InterruptedIOException iioe) {
+				// log("Interrupted: "+iioe);
+				// If we were interrupted by other thread.
+				if (iddleTimeout == 0) {
+					return;
+				}
+
+				// If last datagram was received, long time ago, return.
+				final long timeSinceRead = System.currentTimeMillis()
+						- lastReadTime;
+				if (timeSinceRead >= iddleTimeout - 100) {
+					return;
+				}
+			}
+			dp.setLength(data.length);
+		}
+	}
+}

src/com/runjva/sourceforge/jsocks/protocol/UserPasswordAuthentication.java

@@ -0,0 +1,91 @@
+package com.runjva.sourceforge.jsocks.protocol;
+
+/**
+ * SOCKS5 User Password authentication scheme.
+ */
+public class UserPasswordAuthentication implements Authentication {
+
+	/** SOCKS ID for User/Password authentication method */
+	public final static int METHOD_ID = 2;
+
+	String userName, password;
+	byte[] request;
+
+	/**
+	 * Create an instance of UserPasswordAuthentication.
+	 * 
+	 * @param userName
+	 *            User Name to send to SOCKS server.
+	 * @param password
+	 *            Password to send to SOCKS server.
+	 */
+	public UserPasswordAuthentication(String userName, String password) {
+		this.userName = userName;
+		this.password = password;
+		formRequest();
+	}
+
+	/**
+	 * Get the user name.
+	 * 
+	 * @return User name.
+	 */
+	public String getUser() {
+		return userName;
+	}
+
+	/**
+	 * Get password
+	 * 
+	 * @return Password
+	 */
+	public String getPassword() {
+		return password;
+	}
+
+	/**
+	 * Does User/Password authentication as defined in rfc1929.
+	 * 
+	 * @return An array containnig in, out streams, or null if authentication
+	 *         fails.
+	 */
+	public Object[] doSocksAuthentication(int methodId,
+			java.net.Socket proxySocket) throws java.io.IOException {
+
+		if (methodId != METHOD_ID) {
+			return null;
+		}
+
+		final java.io.InputStream in = proxySocket.getInputStream();
+		final java.io.OutputStream out = proxySocket.getOutputStream();
+
+		out.write(request);
+		final int version = in.read();
+		if (version < 0) {
+			return null; // Server closed connection
+		}
+		final int status = in.read();
+		if (status != 0) {
+			return null; // Server closed connection, or auth failed.
+		}
+
+		return new Object[] { in, out };
+	}
+
+	// Private methods
+	// ////////////////
+
+	/** Convert UserName password in to binary form, ready to be send to server */
+	private void formRequest() {
+		final byte[] user_bytes = userName.getBytes();
+		final byte[] password_bytes = password.getBytes();
+
+		request = new byte[3 + user_bytes.length + password_bytes.length];
+		request[0] = (byte) 1;
+		request[1] = (byte) user_bytes.length;
+		System.arraycopy(user_bytes, 0, request, 2, user_bytes.length);
+		request[2 + user_bytes.length] = (byte) password_bytes.length;
+		System.arraycopy(password_bytes, 0, request, 3 + user_bytes.length,
+				password_bytes.length);
+	}
+}

src/com/runjva/sourceforge/jsocks/server/Ident.java

@@ -0,0 +1,176 @@
+package com.runjva.sourceforge.jsocks.server;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.InterruptedIOException;
+import java.net.ConnectException;
+import java.net.Socket;
+import java.util.StringTokenizer;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Class Ident provides means to obtain user name of the owner of the socket on
+ * remote machine, providing remote machine runs identd daemon.
+ * <p>
+ * To use it: <tt><pre>
+   Socket s = ss.accept();
+   Ident id = new Ident(s);
+   if(id.successful) goUseUser(id.userName);
+   else handleIdentError(id.errorCode,id.errorMessage)
+   </pre></tt>
+ */
+public class Ident {
+
+	Logger log = LoggerFactory.getLogger(Ident.class);
+
+	/** Error Message can be null. */
+	public String errorMessage;
+
+	/** Host type as returned by daemon, can be null, if error happened */
+	public String hostType;
+
+	/** User name as returned by the identd daemon, or null, if it failed */
+	public String userName;
+
+	/**
+	 * If this is true then userName and hostType contain valid values. Else
+	 * errorCode contain the error code, and errorMessage contains the
+	 * corresponding message.
+	 */
+	public boolean successful;
+
+	/** Error code */
+	public int errorCode;
+
+	/** Identd on port 113 can't be contacted */
+	public static final int ERR_NO_CONNECT = 1;
+
+	/** Connection timed out */
+	public static final int ERR_TIMEOUT = 2;
+
+	/**
+	 * Identd daemon responded with ERROR, in this case errorMessage contains
+	 * the string explanation, as send by the daemon.
+	 */
+	public static final int ERR_PROTOCOL = 3;
+
+	/**
+	 * When parsing server response protocol error happened.
+	 */
+	public static final int ERR_PROTOCOL_INCORRECT = 4;
+
+	/**
+	 * Maximum amount of time we should wait before dropping the connection to
+	 * identd server.Setting it to 0 implies infinit timeout.
+	 */
+	public static final int connectionTimeout = 10000;
+
+	/**
+	 * Constructor tries to connect to Identd daemon on the host of the given
+	 * socket, and retrieve user name of the owner of given socket connection on
+	 * remote machine. After constructor returns public fields are initialised
+	 * to whatever the server returned.
+	 * <p>
+	 * If user name was successfully retrieved successful is set to true, and
+	 * userName and hostType are set to whatever server returned. If however for
+	 * some reason user name was not obtained, successful is set to false and
+	 * errorCode contains the code explaining the reason of failure, and
+	 * errorMessage contains human readable explanation.
+	 * <p>
+	 * Constructor may block, for a while.
+	 * 
+	 * @param s
+	 *            Socket whose ownership on remote end should be obtained.
+	 */
+	public Ident(Socket s) {
+		Socket sock = null;
+		successful = false; // We are pessimistic
+
+		try {
+			sock = new Socket(s.getInetAddress(), 113);
+			sock.setSoTimeout(connectionTimeout);
+			final byte[] request = ("" + s.getPort() + " , " + s.getLocalPort() + "\r\n")
+					.getBytes();
+
+			sock.getOutputStream().write(request);
+
+			final BufferedReader in = new BufferedReader(new InputStreamReader(
+					sock.getInputStream()));
+
+			parseResponse(in.readLine());
+
+		} catch (final InterruptedIOException iioe) {
+			errorCode = ERR_TIMEOUT;
+			errorMessage = "Connection to identd timed out.";
+		} catch (final ConnectException ce) {
+			errorCode = ERR_NO_CONNECT;
+			errorMessage = "Connection to identd server failed.";
+
+		} catch (final IOException ioe) {
+			errorCode = ERR_NO_CONNECT;
+			errorMessage = "" + ioe;
+		} finally {
+			try {
+				if (sock != null) {
+					sock.close();
+				}
+			} catch (final IOException ioe) {
+				log.warn("Could not close socket", ioe);
+			}
+		}
+	}
+
+	private void parseResponse(String response) {
+		if (response == null) {
+			errorCode = ERR_PROTOCOL_INCORRECT;
+			errorMessage = "Identd server closed connection.";
+			return;
+		}
+
+		final StringTokenizer st = new StringTokenizer(response, ":");
+		if (st.countTokens() < 3) {
+			errorCode = ERR_PROTOCOL_INCORRECT;
+			errorMessage = "Can't parse server response.";
+			return;
+		}
+
+		st.nextToken(); // Discard first token, it's basically what we have send
+		final String command = st.nextToken().trim().toUpperCase();
+
+		if (command.equals("USERID") && (st.countTokens() >= 2)) {
+			successful = true;
+			hostType = st.nextToken().trim();
+			userName = st.nextToken("").substring(1);// Get all that is left
+		} else if (command.equals("ERROR")) {
+			errorCode = ERR_PROTOCOL;
+			errorMessage = st.nextToken();
+		} else {
+			errorCode = ERR_PROTOCOL_INCORRECT;
+			System.out.println("Opa!");
+			errorMessage = "Can't parse server response.";
+		}
+
+	}
+
+	// /////////////////////////////////////////////
+	// USED for Testing
+	/*
+	 * public static void main(String[] args) throws IOException{
+	 * 
+	 * Socket s = null; s = new Socket("gp101-16", 1391);
+	 * 
+	 * Ident id = new Ident(s); if(id.successful){
+	 * System.out.println("User: "+id.userName);
+	 * System.out.println("HostType: "+id.hostType); }else{
+	 * System.out.println("ErrorCode: "+id.errorCode);
+	 * System.out.println("ErrorMessage: "+id.errorMessage);
+	 * 
+	 * }
+	 * 
+	 * if(s!= null) s.close(); } //
+	 */
+
+}

src/com/runjva/sourceforge/jsocks/server/IdentAuthenticator.java

@@ -0,0 +1,182 @@
+package com.runjva.sourceforge.jsocks.server;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.util.Enumeration;
+import java.util.Hashtable;
+import java.util.Vector;
+
+import com.runjva.sourceforge.jsocks.protocol.InetRange;
+import com.runjva.sourceforge.jsocks.protocol.ProxyMessage;
+
+/**
+ * An implementation of socks.ServerAuthentication which provides simple
+ * authentication based on the host from which the connection is made and the
+ * name of the user on the remote machine, as reported by identd daemon on the
+ * remote machine.
+ * <p>
+ * It can also be used to provide authentication based only on the contacting
+ * host address.
+ */
+
+public class IdentAuthenticator extends ServerAuthenticatorBase {
+	/** Vector of InetRanges */
+	Vector<InetRange> hosts;
+
+	/** Vector of user hashes */
+	Vector<Hashtable<?, ?>> users;
+
+	String user;
+
+	/**
+	 * Constructs empty IdentAuthenticator.
+	 */
+	public IdentAuthenticator() {
+		hosts = new Vector<InetRange>();
+		users = new Vector<Hashtable<?, ?>>();
+	}
+
+	/**
+	 * Used to create instances returned from startSession.
+	 * 
+	 * @param in
+	 *            Input stream.
+	 * @param out
+	 *            OutputStream.
+	 * @param user
+	 *            Username associated with this connection,could be null if name
+	 *            was not required.
+	 */
+	IdentAuthenticator(InputStream in, OutputStream out, String user) {
+		super(in, out);
+		this.user = user;
+	}
+
+	/**
+	 * Adds range of addresses from which connection is allowed. Hashtable users
+	 * should contain user names as keys and anything as values (value is not
+	 * used and will be ignored).
+	 * 
+	 * @param hostRange
+	 *            Range of ip addresses from which connection is allowed.
+	 * @param users
+	 *            Hashtable of users for whom connection is allowed, or null to
+	 *            indicate that anybody is allowed to connect from the hosts
+	 *            within given range.
+	 */
+	public synchronized void add(InetRange hostRange, Hashtable<?, ?> users) {
+		this.hosts.addElement(hostRange);
+		this.users.addElement(users);
+	}
+
+	/**
+	 * Grants permission only to those users, who connect from one of the hosts
+	 * registered with add(InetRange,Hashtable) and whose names, as reported by
+	 * identd daemon, are listed for the host the connection came from.
+	 */
+	public ServerAuthenticator startSession(Socket s) throws IOException {
+
+		final int ind = getRangeIndex(s.getInetAddress());
+		String user = null;
+
+		// System.out.println("getRangeReturned:"+ind);
+
+		if (ind < 0) {
+			return null; // Host is not on the list.
+		}
+
+		final ServerAuthenticator serverAuthenticator = super.startSession(s);
+		final ServerAuthenticatorBase auth = (ServerAuthenticatorBase) serverAuthenticator;
+
+		// System.out.println("super.startSession() returned:"+auth);
+		if (auth == null) {
+			return null;
+		}
+
+		// do the authentication
+
+		final Hashtable<?, ?> user_names = users.elementAt(ind);
+
+		if (user_names != null) { // If need to do authentication
+			Ident ident;
+			ident = new Ident(s);
+			// If can't obtain user name, fail
+			if (!ident.successful) {
+				return null;
+			}
+			// If user name is not listed for this address, fail
+			if (!user_names.containsKey(ident.userName)) {
+				return null;
+			}
+			user = ident.userName;
+		}
+		return new IdentAuthenticator(auth.in, auth.out, user);
+
+	}
+
+	/**
+	 * For SOCKS5 requests allways returns true. For SOCKS4 requests checks
+	 * wether the user name supplied in the request corresponds to the name
+	 * obtained from the ident daemon.
+	 */
+	public boolean checkRequest(ProxyMessage msg, java.net.Socket s) {
+		// If it's version 5 request, or if anybody is permitted, return true;
+		if ((msg.version == 5) || (user == null)) {
+			return true;
+		}
+
+		if (msg.version != 4) {
+			return false; // Who knows?
+		}
+
+		return user.equals(msg.user);
+	}
+
+	/** Get String representaion of the IdentAuthenticator. */
+	public String toString() {
+		String s = "";
+
+		for (int i = 0; i < hosts.size(); ++i) {
+			s += "(Range:" + hosts.elementAt(i) + "," + //
+					" Users:" + userNames(i) + ") ";
+		}
+		return s;
+	}
+
+	// Private Methods
+	// ////////////////
+	private int getRangeIndex(InetAddress ip) {
+		int index = 0;
+		final Enumeration<InetRange> enumx = hosts.elements();
+		while (enumx.hasMoreElements()) {
+			final InetRange ir = enumx.nextElement();
+			if (ir.contains(ip)) {
+				return index;
+			}
+			index++;
+		}
+		return -1; // Not found
+	}
+
+	private String userNames(int i) {
+		if (users.elementAt(i) == null) {
+			return "Everybody is permitted.";
+		}
+
+		final Enumeration<?> enumx = ((Hashtable<?, ?>) users.elementAt(i))
+				.keys();
+		if (!enumx.hasMoreElements()) {
+			return "";
+		}
+		String s = enumx.nextElement().toString();
+		while (enumx.hasMoreElements()) {
+			s += "; " + enumx.nextElement();
+		}
+
+		return s;
+	}
+
+}

src/com/runjva/sourceforge/jsocks/server/ServerAuthenticator.java

@@ -0,0 +1,126 @@
+package com.runjva.sourceforge.jsocks.server;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.DatagramPacket;
+import java.net.Socket;
+
+import com.runjva.sourceforge.jsocks.protocol.ProxyMessage;
+import com.runjva.sourceforge.jsocks.protocol.UDPEncapsulation;
+
+/**
+ * Classes implementing this interface should provide socks server with
+ * authentication and authorization of users.
+ **/
+public interface ServerAuthenticator {
+
+	/**
+	 * This method is called when a new connection accepted by the server.
+	 * <p>
+	 * At this point no data have been extracted from the connection. It is
+	 * responsibility of this method to ensure that the next byte in the stream
+	 * after this method have been called is the first byte of the socks request
+	 * message. For SOCKSv4 there is no authentication data and the first byte
+	 * in the stream is part of the request. With SOCKSv5 however there is an
+	 * authentication data first. It is expected that implementaions will
+	 * process this authentication data.
+	 * <p>
+	 * If authentication was successful an instance of ServerAuthentication
+	 * should be returned, it later will be used by the server to perform
+	 * authorization and some other things. If authentication fails null should
+	 * be returned, or an exception may be thrown.
+	 * 
+	 * @param s
+	 *            Accepted Socket.
+	 * @return An instance of ServerAuthenticator to be used for this connection
+	 *         or null
+	 */
+	ServerAuthenticator startSession(Socket s) throws IOException;
+
+	/**
+	 * This method should return input stream which should be used on the
+	 * accepted socket.
+	 * <p>
+	 * SOCKSv5 allows to have multiple authentication methods, and these methods
+	 * might require some kind of transformations being made on the data.
+	 * <p>
+	 * This method is called on the object returned from the startSession
+	 * function.
+	 */
+	InputStream getInputStream();
+
+	/**
+	 * This method should return output stream to use to write to the accepted
+	 * socket.
+	 * <p>
+	 * SOCKSv5 allows to have multiple authentication methods, and these methods
+	 * might require some kind of transformations being made on the data.
+	 * <p>
+	 * This method is called on the object returned from the startSession
+	 * function.
+	 */
+	OutputStream getOutputStream();
+
+	/**
+	 * This method should return UDPEncapsulation, which should be used on the
+	 * datagrams being send in/out.
+	 * <p>
+	 * If no transformation should be done on the datagrams, this method should
+	 * return null.
+	 * <p>
+	 * This method is called on the object returned from the startSession
+	 * function.
+	 */
+
+	UDPEncapsulation getUdpEncapsulation();
+
+	/**
+	 * This method is called when a request have been read.
+	 * <p>
+	 * Implementation should decide wether to grant request or not. Returning
+	 * true implies granting the request, false means request should be
+	 * rejected.
+	 * <p>
+	 * This method is called on the object returned from the startSession
+	 * function.
+	 * 
+	 * @param msg
+	 *            Request message.
+	 * @return true to grant request, false to reject it.
+	 */
+	boolean checkRequest(ProxyMessage msg);
+
+	/**
+	 * This method is called when datagram is received by the server.
+	 * <p>
+	 * Implementaions should decide wether it should be forwarded or dropped. It
+	 * is expecteed that implementation will use datagram address and port
+	 * information to make a decision, as well as anything else. Address and
+	 * port of the datagram are always correspond to remote machine. It is
+	 * either destination or source address. If out is true address is
+	 * destination address, else it is a source address, address of the machine
+	 * from which datagram have been received for the client.
+	 * <p>
+	 * Implementaions should return true if the datagram is to be forwarded, and
+	 * false if the datagram should be dropped.
+	 * <p>
+	 * This method is called on the object returned from the startSession
+	 * function.
+	 * 
+	 * @param out
+	 *            If true the datagram is being send out(from the client),
+	 *            otherwise it is an incoming datagram.
+	 * @return True to forward datagram false drop it silently.
+	 */
+	boolean checkRequest(DatagramPacket dp, boolean out);
+
+	/**
+	 * This method is called when session is completed. Either due to normal
+	 * termination or due to any error condition.
+	 * <p>
+	 * This method is called on the object returned from the startSession
+	 * function.
+	 */
+	void endSession();
+}

src/com/runjva/sourceforge/jsocks/server/ServerAuthenticatorBase.java

@@ -0,0 +1,187 @@
+package com.runjva.sourceforge.jsocks.server;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.PushbackInputStream;
+import java.net.Socket;
+
+import com.runjva.sourceforge.jsocks.protocol.ProxyMessage;
+import com.runjva.sourceforge.jsocks.protocol.UDPEncapsulation;
+
+/**
+ * An implementation of ServerAuthenticator, which does <b>not</b> do any
+ * authentication.
+ * <P>
+ * <FONT size="+3" color ="FF0000"> Warning!!</font><br>
+ * Should not be used on machines which are not behind the firewall.
+ * <p>
+ * It is only provided to make implementing other authentication schemes easier.
+ * <br>
+ * For Example: <tt><pre>
+   class MyAuth extends socks.server.ServerAuthenticator{
+    ...
+    public ServerAuthenticator startSession(java.net.Socket s){
+      if(!checkHost(s.getInetAddress()) return null;
+      return super.startSession(s);
+    }
+
+    boolean checkHost(java.net.Inetaddress addr){
+      boolean allow;
+      //Do it somehow
+      return allow;
+    }
+   }
+</pre></tt>
+ */
+public abstract class ServerAuthenticatorBase implements ServerAuthenticator {
+
+	static final byte[] socks5response = { 5, 0 };
+
+	InputStream in;
+	OutputStream out;
+
+	/**
+	 * Creates new instance of the ServerAuthenticatorNone.
+	 */
+	public ServerAuthenticatorBase() {
+		this.in = null;
+		this.out = null;
+	}
+
+	/**
+	 * Constructs new ServerAuthenticatorNone object suitable for returning from
+	 * the startSession function.
+	 * 
+	 * @param in
+	 *            Input stream to return from getInputStream method.
+	 * @param out
+	 *            Output stream to return from getOutputStream method.
+	 */
+	public ServerAuthenticatorBase(InputStream in, OutputStream out) {
+		this.in = in;
+		this.out = out;
+	}
+
+	/**
+	 * Grants access to everyone.Removes authentication related bytes from the
+	 * stream, when a SOCKS5 connection is being made, selects an authentication
+	 * NONE.
+	 */
+	public ServerAuthenticator startSession(Socket s) throws IOException {
+
+		final PushbackInputStream in = new PushbackInputStream(s
+				.getInputStream());
+		final OutputStream out = s.getOutputStream();
+
+		final int version = in.read();
+		if (version == 5) {
+			if (!selectSocks5Authentication(in, out, 0)) {
+				return null;
+			}
+		} else if (version == 4) {
+			// Else it is the request message already, version 4
+			in.unread(version);
+		} else {
+			return null;
+		}
+
+		return new ServerAuthenticatorNone(in, out);
+	}
+
+	/**
+	 * Get input stream.
+	 * 
+	 * @return Input stream speciefied in the constructor.
+	 */
+	public InputStream getInputStream() {
+		return in;
+	}
+
+	/**
+	 * Get output stream.
+	 * 
+	 * @return Output stream speciefied in the constructor.
+	 */
+	public OutputStream getOutputStream() {
+		return out;
+	}
+
+	/**
+	 * Allways returns null.
+	 * 
+	 * @return null
+	 */
+	public UDPEncapsulation getUdpEncapsulation() {
+		return null;
+	}
+
+	/**
+	 * Allways returns true.
+	 */
+	public boolean checkRequest(ProxyMessage msg) {
+		return true;
+	}
+
+	/**
+	 * Allways returns true.
+	 */
+	public boolean checkRequest(java.net.DatagramPacket dp, boolean out) {
+		return true;
+	}
+
+	/**
+	 * Does nothing.
+	 */
+	public void endSession() {
+	}
+
+	/**
+	 * Convinience routine for selecting SOCKSv5 authentication.
+	 * <p>
+	 * This method reads in authentication methods that client supports, checks
+	 * wether it supports given method. If it does, the notification method is
+	 * written back to client, that this method have been chosen for
+	 * authentication. If given method was not found, authentication failure
+	 * message is send to client ([5,FF]).
+	 * 
+	 * @param in
+	 *            Input stream, version byte should be removed from the stream
+	 *            before calling this method.
+	 * @param out
+	 *            Output stream.
+	 * @param methodId
+	 *            Method which should be selected.
+	 * @return true if methodId was found, false otherwise.
+	 */
+	static public boolean selectSocks5Authentication(InputStream in,
+			OutputStream out, int methodId) throws IOException {
+
+		final int num_methods = in.read();
+		if (num_methods <= 0) {
+			return false;
+		}
+		final byte method_ids[] = new byte[num_methods];
+		final byte response[] = new byte[2];
+		boolean found = false;
+
+		response[0] = (byte) 5; // SOCKS version
+		response[1] = (byte) 0xFF; // Not found, we are pessimistic
+
+		int bread = 0; // bytes read so far
+		while (bread < num_methods) {
+			bread += in.read(method_ids, bread, num_methods - bread);
+		}
+
+		for (int i = 0; i < num_methods; ++i) {
+			if (method_ids[i] == methodId) {
+				found = true;
+				response[1] = (byte) methodId;
+				break;
+			}
+		}
+
+		out.write(response);
+		return found;
+	}
+}

src/com/runjva/sourceforge/jsocks/server/ServerAuthenticatorNone.java

@@ -0,0 +1,16 @@
+package com.runjva.sourceforge.jsocks.server;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/**
+ * Simplest possible ServerAuthenticator implementation. Extends common base.
+ * 
+ */
+public class ServerAuthenticatorNone extends ServerAuthenticatorBase {
+
+	public ServerAuthenticatorNone(InputStream in, OutputStream out) {
+		super(in, out);
+	}
+
+}

src/com/runjva/sourceforge/jsocks/server/UserPasswordAuthenticator.java

@@ -0,0 +1,82 @@
+package com.runjva.sourceforge.jsocks.server;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.Socket;
+
+/**
+ * This class implements SOCKS5 User/Password authentication scheme as defined
+ * in rfc1929,the server side of it. (see docs/rfc1929.txt)
+ */
+public class UserPasswordAuthenticator extends ServerAuthenticatorBase {
+
+	static final int METHOD_ID = 2;
+
+	UserValidation validator;
+
+	/**
+	 * Construct a new UserPasswordAuthentication object, with given
+	 * UserVlaidation scheme.
+	 * 
+	 * @param v
+	 *            UserValidation to use for validating users.
+	 */
+	public UserPasswordAuthenticator(UserValidation validator) {
+		this.validator = validator;
+	}
+
+	public ServerAuthenticator startSession(Socket s) throws IOException {
+		final InputStream in = s.getInputStream();
+		final OutputStream out = s.getOutputStream();
+
+		if (in.read() != 5) {
+			return null; // Drop non version 5 messages.
+		}
+
+		if (!selectSocks5Authentication(in, out, METHOD_ID)) {
+			return null;
+		}
+		if (!doUserPasswordAuthentication(s, in, out)) {
+			return null;
+		}
+
+		return new ServerAuthenticatorNone(in, out);
+	}
+
+	// Private Methods
+	// ////////////////
+
+	private boolean doUserPasswordAuthentication(Socket s, InputStream in,
+			OutputStream out) throws IOException {
+		final int version = in.read();
+		if (version != 1) {
+			return false;
+		}
+
+		final int ulen = in.read();
+		if (ulen < 0) {
+			return false;
+		}
+
+		final byte[] user = new byte[ulen];
+		in.read(user);
+		final int plen = in.read();
+		if (plen < 0) {
+			return false;
+		}
+		final byte[] password = new byte[plen];
+		in.read(password);
+
+		if (validator.isUserValid(new String(user), new String(password), s)) {
+			// System.out.println("user valid");
+			out.write(new byte[] { 1, 0 });
+		} else {
+			// System.out.println("user invalid");
+			out.write(new byte[] { 1, 1 });
+			return false;
+		}
+
+		return true;
+	}
+}

src/com/runjva/sourceforge/jsocks/server/UserValidation.java

@@ -0,0 +1,24 @@
+package com.runjva.sourceforge.jsocks.server;
+
+/**
+ * Interface which provides for user validation, based on user name password and
+ * where it connects from.
+ */
+public interface UserValidation {
+	/**
+	 * Implementations of this interface are expected to use some or all of the
+	 * information provided plus any information they can extract from other
+	 * sources to decide wether given user should be allowed access to SOCKS
+	 * server, or whatever you use it for.
+	 * 
+	 * @return true to indicate user is valid, false otherwise.
+	 * @param username
+	 *            User whom implementation should validate.
+	 * @param password
+	 *            Password this user provided.
+	 * @param connection
+	 *            Socket which user used to connect to the server.
+	 */
+	boolean isUserValid(String username, String password,
+			java.net.Socket connection);
+}

src/org/torproject/android/Orbot.java

@@ -13,9 +13,11 @@ import org.torproject.android.service.TorService;
 import org.torproject.android.service.TorServiceConstants;
 import org.torproject.android.service.TorServiceUtils;
 import org.torproject.android.settings.SettingsPreferences;
+import org.torproject.android.vpn.OrbotVpnService;
 import org.torproject.android.wizard.ChooseLocaleWizardActivity;
 import org.torproject.android.wizard.TipsAndTricks;
 
+import android.annotation.TargetApi;
 import android.app.AlertDialog;
 import android.app.ProgressDialog;
 import android.content.ComponentName;
@@ -32,6 +34,8 @@ import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.res.Configuration;
 import android.net.Uri;
+import android.net.VpnService;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.IBinder;
@@ -412,6 +416,10 @@ public class Orbot extends ActionBarActivity implements TorConstants, OnLongClic
                         
                         
                 }
+                else if (item.getItemId() == R.id.menu_vpn)
+                {
+                	this.startVpnService();
+                }
                 
         return true;
         }
@@ -782,9 +790,18 @@ public class Orbot extends ActionBarActivity implements TorConstants, OnLongClic
             startActivityForResult(new Intent(this, SettingsPreferences.class), 1);
     }
     
+    private final static int REQUEST_VPN = 8888;
     
-    
-    
+    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
+	public void startVpnService () {
+        Intent intent = VpnService.prepare(this);
+        if (intent != null) {
+            startActivityForResult(intent, REQUEST_VPN);
+        } else {
+            onActivityResult(REQUEST_VPN, RESULT_OK, null);
+        }
+    }
+
     
     @Override
 	protected void onActivityResult(int request, int response, Intent data) {
@@ -827,6 +844,11 @@ public class Orbot extends ActionBarActivity implements TorConstants, OnLongClic
 
 			}
 		}
+		else if (request == REQUEST_VPN && response == RESULT_OK)
+		{
+			Intent intent = new Intent(this, OrbotVpnService.class);
+            startService(intent);
+		}
 	}
 
 
@@ -1207,7 +1229,6 @@ public class Orbot extends ActionBarActivity implements TorConstants, OnLongClic
      
     private final ServiceConnection mConnection = new ServiceConnection() {
     	
-    	
         public void onServiceConnected(ComponentName className,
                 IBinder service) {
         	

src/org/torproject/android/vpn/OrbotVpnService.java

@@ -0,0 +1,239 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.torproject.android.vpn;
+
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.UnknownHostException;
+import java.nio.ByteBuffer;
+import java.nio.channels.DatagramChannel;
+import java.util.Locale;
+
+import org.torproject.android.service.TorServiceConstants;
+
+import android.annotation.TargetApi;
+import android.app.PendingIntent;
+import android.content.Intent;
+import android.net.VpnService;
+import android.os.Build;
+import android.os.Handler;
+import android.os.Message;
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+import android.widget.Toast;
+
+import com.runjva.sourceforge.jsocks.protocol.ProxyServer;
+import com.runjva.sourceforge.jsocks.server.ServerAuthenticatorNone;
+
+@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
+public class OrbotVpnService extends VpnService implements Handler.Callback {
+    private static final String TAG = "OrbotVpnService";
+
+    private PendingIntent mConfigureIntent;
+
+    private Handler mHandler;
+    private Thread mThread;
+
+    private String mSessionName = "OrbotVPN";
+    private ParcelFileDescriptor mInterface;
+
+    private int mSocksProxyPort = 9999;
+    private ProxyServer mProxyServer;
+    
+    private boolean mKeepRunning = true;
+    
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        // The handler is only used to show messages.
+        if (mHandler == null) {
+            mHandler = new Handler(this);
+        }
+
+        // Stop the previous session by interrupting the thread.
+        if (mThread != null) {
+            mThread.interrupt();
+        }
+     
+        startSocksBypass ();
+        setupTun2Socks();
+        
+        return START_STICKY;
+    }
+    
+    private void startSocksBypass ()
+    {
+	    Thread thread = new Thread ()
+	    {
+	    	public void run ()
+	    	{
+	    
+		        try {
+		        	mProxyServer = new ProxyServer(new ServerAuthenticatorNone(null, null));
+		        	mProxyServer.setVpnService(OrbotVpnService.this);
+		        	mProxyServer.start(mSocksProxyPort, 5, InetAddress.getLocalHost());
+				} catch (Exception e) {
+					e.printStackTrace();
+				}
+	    	}
+	    };
+	    
+	    thread.start();
+    }
+
+    @Override
+    public void onDestroy() {
+        if (mThread != null) {
+        	mKeepRunning = false;
+            mThread.interrupt();
+        }
+        
+        if (mProxyServer != null)
+        	mProxyServer.stop();
+    }
+
+    @Override
+    public boolean handleMessage(Message message) {
+        if (message != null) {
+            Toast.makeText(this, message.what, Toast.LENGTH_SHORT).show();
+        }
+        return true;
+    }
+
+  
+    private void setupTun2Socks()  {
+       
+    	if (mInterface == null)
+    	{
+    		// Set the locale to English (or probably any other language that^M
+            // uses Hindu-Arabic (aka Latin) numerals).^M
+            // We have found that VpnService.Builder does something locale-dependent^M
+            // internally that causes errors when the locale uses its own numerals^M
+            // (i.e., Farsi and Arabic).^M
+    		Locale.setDefault(new Locale("en"));
+    		
+	        Builder builder = new Builder();
+	        
+	        builder.setMtu(3000);
+	        builder.addAddress("10.0.0.1",8);
+	        builder.setSession("OrbotVPN");	        	
+	        builder.addRoute("0.0.0.0",0);	        
+	        builder.addRoute("10.0.0.0",8);
+	        //builder.addDnsServer("10.0.0.2");
+	        builder.addDnsServer("127.0.0.1");
+	        // Close the old interface since the parameters have been changed.
+	        try {
+	            mInterface.close();
+	        } catch (Exception e) {  
+	            // ignore
+	        }
+	        
+	
+	        // Create a new interface using the builder and save the parameters.
+	        mInterface = builder.setSession(mSessionName)
+	                .setConfigureIntent(mConfigureIntent)
+	                .establish();
+	        	    
+	        Tun2Socks.Start(mInterface, 3000, "10.0.0.2", "255.255.255.0", "localhost:" + TorServiceConstants.PORT_SOCKS_DEFAULT, null, true);
+    	}
+    }
+    
+    private void debugPacket(ByteBuffer packet)
+    {
+
+    	int buffer = packet.get();
+        int version;
+        int headerlength;
+        version = buffer >> 4;
+        headerlength = buffer & 0x0F;
+        headerlength *= 4;
+        Log.d(TAG, "IP Version:"+version);
+        Log.d(TAG, "Header Length:"+headerlength);
+
+        String status = "";
+        status += "Header Length:"+headerlength;
+
+        buffer = packet.get();      //DSCP + EN
+        buffer = packet.getChar();  //Total Length
+
+        Log.d(TAG, "Total Length:"+buffer);
+
+        buffer = packet.getChar();  //Identification
+        Log.d(TAG, "Identification:"+buffer);
+
+        buffer = packet.getChar();  //Flags + Fragment Offset
+        buffer = packet.get();      //Time to Live
+        buffer = packet.get();      //Protocol
+
+        Log.d(TAG, "Protocol:"+buffer);
+
+        status += "  Protocol:"+buffer;
+
+        buffer = packet.getChar();  //Header checksum
+
+        String sourceIP  = "";
+        buffer = packet.get();  //Source IP 1st Octet
+        sourceIP += buffer;
+        sourceIP += ".";
+
+        buffer = packet.get();  //Source IP 2nd Octet
+        sourceIP += buffer;
+        sourceIP += ".";
+
+        buffer = packet.get();  //Source IP 3rd Octet
+        sourceIP += buffer;
+        sourceIP += ".";
+
+        buffer = packet.get();  //Source IP 4th Octet
+        sourceIP += buffer;
+
+        Log.d(TAG, "Source IP:"+sourceIP);
+
+        status += "   Source IP:"+sourceIP;
+
+        String destIP  = "";
+        buffer = packet.get();  //Destination IP 1st Octet
+        destIP += buffer;
+        destIP += ".";
+
+        buffer = packet.get();  //Destination IP 2nd Octet
+        destIP += buffer;
+        destIP += ".";
+
+        buffer = packet.get();  //Destination IP 3rd Octet
+        destIP += buffer;
+        destIP += ".";
+
+        buffer = packet.get();  //Destination IP 4th Octet
+        destIP += buffer;
+
+        Log.d(TAG, "Destination IP:"+destIP);
+
+        status += "   Destination IP:"+destIP;
+        /*
+        msgObj = mHandler.obtainMessage();
+        msgObj.obj = status;
+        mHandler.sendMessage(msgObj);
+        */
+
+        //Log.d(TAG, "version:"+packet.getInt());
+        //Log.d(TAG, "version:"+packet.getInt());
+        //Log.d(TAG, "version:"+packet.getInt());
+
+    }
+
+}

src/org/torproject/android/vpn/Tun2Socks.java

@@ -0,0 +1,124 @@
+package org.torproject.android.vpn;
+
+/*
+ * Copyright (c) 2013, Psiphon Inc.
+ * All rights reserved.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+import java.net.DatagramSocket;
+import java.net.Socket;
+
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.os.ParcelFileDescriptor;
+
+@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
+public class Tun2Socks
+{
+    public static interface IProtectSocket
+    {
+        boolean doVpnProtect(Socket socket);
+        boolean doVpnProtect(DatagramSocket socket);
+    };
+
+
+    private static Thread mThread;
+    private static ParcelFileDescriptor mVpnInterfaceFileDescriptor;
+    private static int mVpnInterfaceMTU;
+    private static String mVpnIpAddress;
+    private static String mVpnNetMask;
+    private static String mSocksServerAddress;
+    private static String mUdpgwServerAddress;
+    private static boolean mUdpgwTransparentDNS;
+    
+    // Note: this class isn't a singleton, but you can't run more
+    // than one instance due to the use of global state (the lwip
+    // module, etc.) in the native code.
+    
+    public static synchronized void Start(
+            ParcelFileDescriptor vpnInterfaceFileDescriptor,
+            int vpnInterfaceMTU,
+            String vpnIpAddress,
+            String vpnNetMask,
+            String socksServerAddress,
+            String udpgwServerAddress,
+            boolean udpgwTransparentDNS)
+    {
+        
+        
+        Stop();
+
+        mVpnInterfaceFileDescriptor = vpnInterfaceFileDescriptor;
+        mVpnInterfaceMTU = vpnInterfaceMTU;
+        mVpnIpAddress = vpnIpAddress;
+        mVpnNetMask = vpnNetMask;
+        mSocksServerAddress = socksServerAddress;
+        mUdpgwServerAddress = udpgwServerAddress;
+        mUdpgwTransparentDNS = udpgwTransparentDNS;
+
+        mThread = new Thread(new Runnable()
+        {
+            @Override
+            public void run()
+            {
+                runTun2Socks(
+                        mVpnInterfaceFileDescriptor.detachFd(),
+                        mVpnInterfaceMTU,
+                        mVpnIpAddress,
+                        mVpnNetMask,
+                        mSocksServerAddress,
+                        mUdpgwServerAddress,
+                        mUdpgwTransparentDNS ? 1 : 0);
+            	
+            }
+        });
+        mThread.start();
+    }
+    
+    public static synchronized void Stop()
+    {
+        if (mThread != null)
+        {
+            terminateTun2Socks();
+            try
+            {
+                mThread.join();
+            }
+            catch (InterruptedException e)
+            {
+                Thread.currentThread().interrupt();
+            }
+            mThread = null;
+        }
+    }
+        
+    private native static int runTun2Socks(
+            int vpnInterfaceFileDescriptor,
+            int vpnInterfaceMTU,
+            String vpnIpAddress,
+            String vpnNetMask,
+            String socksServerAddress,
+            String udpgwServerAddress,
+            int udpgwTransparentDNS);
+
+    private native static void terminateTun2Socks();
+    
+    static
+    {
+        System.loadLibrary("tun2socks");
+    }
+}