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/*
* Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.net.*;
import java.io.*;
import java.util.HashMap;
public class SocksServer extends Thread implements Closeable {
// Some useful SOCKS constant
static final int PROTO_VERS4 = 4;
static final int PROTO_VERS = 5;
static final int DEFAULT_PORT = 1080;
static final int NO_AUTH = 0;
static final int GSSAPI = 1;
static final int USER_PASSW = 2;
static final int NO_METHODS = -1;
static final int CONNECT = 1;
static final int BIND = 2;
static final int UDP_ASSOC = 3;
static final int IPV4 = 1;
static final int DOMAIN_NAME = 3;
static final int IPV6 = 4;
static final int REQUEST_OK = 0;
static final int GENERAL_FAILURE = 1;
static final int NOT_ALLOWED = 2;
static final int NET_UNREACHABLE = 3;
static final int HOST_UNREACHABLE = 4;
static final int CONN_REFUSED = 5;
static final int TTL_EXPIRED = 6;
static final int CMD_NOT_SUPPORTED = 7;
static final int ADDR_TYPE_NOT_SUP = 8;
private int port;
private ServerSocket server;
private boolean useV4 = false;
private HashMap<String,String> users = new HashMap<>();
private volatile boolean done = false;
// Inner class to handle protocol with client
// This is the bulk of the work (protocol handler)
class ClientHandler extends Thread {
private InputStream in;
private OutputStream out;
private Socket client;
private Socket dest;
// Simple tunneling class, moving bits from one stream to another
class Tunnel extends Thread {
private InputStream tin;
private OutputStream tout;
Tunnel(InputStream in, OutputStream out) {
tin = in;
tout = out;
}
public void run() {
int b;
while (true) {
try {
b = tin.read();
if (b == -1) {
tin.close();
tout.close();
return;
}
tout.write(b);
tout.flush();
} catch (IOException e) {
// actually exit from the thread
return;
}
}
}
}
ClientHandler(Socket s) throws IOException {
client = s;
in = new BufferedInputStream(client.getInputStream());
out = new BufferedOutputStream(client.getOutputStream());
}
private void readBuf(InputStream is, byte[] buf) throws IOException {
int l = buf.length;
int count = 0;
int i;
do {
i = is.read(buf, count, l - count);
if (i == -1)
throw new IOException("unexpected EOF");
count += i;
} while (count < l);
}
private boolean userPassAuth() throws IOException {
int ver = in.read();
int ulen = in.read();
if (ulen <= 0)
throw new SocketException("SOCKS protocol error");
byte[] buf = new byte[ulen];
readBuf(in, buf);
String uname = new String(buf);
String password = null;
ulen = in.read();
if (ulen < 0)
throw new SocketException("SOCKS protocol error");
if (ulen > 0) {
buf = new byte[ulen];
readBuf(in, buf);
password = new String(buf);
}
// Check username/password validity here
System.err.println("User: '" + uname);
System.err.println("PSWD: '" + password);
if (users.containsKey(uname)) {
String p1 = users.get(uname);
System.err.println("p1 = " + p1);
if (p1.equals(password)) {
out.write(PROTO_VERS);
out.write(REQUEST_OK);
out.flush();
return true;
}
}
out.write(PROTO_VERS);
out.write(NOT_ALLOWED);
out.flush();
return false;
}
private void purge() throws IOException {
boolean done = false;
int i = 0;
client.setSoTimeout(1000);
while(!done && i != -1) {
try {
i = in.read();
} catch(IOException e) {
done = true;
}
}
}
// Handle the SOCKS version 4 protocl
private void getRequestV4() throws IOException {
int ver = in.read();
int cmd = in.read();
if (ver == -1 || cmd == -1) {
// EOF
in.close();
out.close();
return;
}
if (ver != 0 && ver != 4) {
out.write(PROTO_VERS4);
out.write(91); // Bad Request
out.write(0);
out.write(0);
out.write(0);
out.write(0);
out.write(0);
out.write(0);
out.write(0);
out.flush();
purge();
out.close();
in.close();
return;
}
if (cmd == CONNECT) {
int port = ((in.read() & 0xff) << 8);
port += (in.read() & 0xff);
byte[] buf = new byte[4];
readBuf(in, buf);
InetAddress addr = InetAddress.getByAddress(buf);
// We don't use the username...
int c;
do {
c = (in.read() & 0xff);
} while (c!=0);
boolean ok = true;
try {
dest = new Socket(addr, port);
} catch (IOException e) {
ok = false;
}
if (!ok) {
out.write(PROTO_VERS4);
out.write(91);
out.write(0);
out.write(0);
out.write(buf);
out.flush();
purge();
out.close();
in.close();
return;
}
out.write(PROTO_VERS4);
out.write(90); // Success
out.write((port >> 8) & 0xff);
out.write(port & 0xff);
out.write(buf);
out.flush();
InputStream in2 = new BufferedInputStream(dest.getInputStream());
OutputStream out2 = new BufferedOutputStream(dest.getOutputStream());
Tunnel tunnel = new Tunnel(in2, out);
tunnel.start();
int b = 0;
do {
try {
b = in.read();
if (b == -1) {
in.close();
out2.close();
return;
}
out2.write(b);
out2.flush();
} catch (IOException ex) {
}
} while (!client.isClosed());
}
}
// Negociate the authentication scheme with the client
private void negociate() throws IOException {
int ver = in.read();
int n = in.read();
byte[] buf = null;
if (n > 0) {
buf = new byte[n];
readBuf(in, buf);
}
int scheme = NO_AUTH;
for (int i = 0; i < n; i++)
if (buf[i] == USER_PASSW)
scheme = USER_PASSW;
out.write(PROTO_VERS);
out.write(scheme);
out.flush();
if (scheme == USER_PASSW)
userPassAuth();
}
// Send error message then close the streams
private void sendError(int code) {
try {
out.write(PROTO_VERS);
out.write(code);
out.write(0);
out.write(IPV4);
for (int i=0; i<6; i++)
out.write(0);
out.flush();
out.close();
} catch (IOException ex) {
}
}
// Actually connect the proxy to the destination then initiate tunneling
private void doConnect(InetSocketAddress addr) throws IOException {
dest = new Socket();
try {
dest.connect(addr, 10000);
} catch (SocketTimeoutException ex) {
sendError(HOST_UNREACHABLE);
return;
} catch (ConnectException cex) {
sendError(CONN_REFUSED);
return;
}
// Success
InetAddress iadd = addr.getAddress();
if (iadd instanceof Inet4Address) {
out.write(PROTO_VERS);
out.write(REQUEST_OK);
out.write(0);
out.write(IPV4);
out.write(iadd.getAddress());
} else if (iadd instanceof Inet6Address) {
out.write(PROTO_VERS);
out.write(REQUEST_OK);
out.write(0);
out.write(IPV6);
out.write(iadd.getAddress());
} else {
sendError(GENERAL_FAILURE);
return;
}
out.write((addr.getPort() >> 8) & 0xff);
out.write((addr.getPort() >> 0) & 0xff);
out.flush();
InputStream in2 = new BufferedInputStream(dest.getInputStream());
OutputStream out2 = new BufferedOutputStream(dest.getOutputStream());
Tunnel tunnel = new Tunnel(in2, out);
tunnel.start();
int b = 0;
do {
// Note that the socket might be closed from another thread (the tunnel)
try {
b = in.read();
if (b == -1) {
in.close();
out2.close();
return;
}
out2.write(b);
out2.flush();
} catch(IOException ioe) {
}
} while (!client.isClosed());
}
private void doBind(InetSocketAddress addr) throws IOException {
ServerSocket svr = new ServerSocket();
svr.bind(null);
InetSocketAddress bad = (InetSocketAddress) svr.getLocalSocketAddress();
out.write(PROTO_VERS);
out.write(REQUEST_OK);
out.write(0);
out.write(IPV4);
out.write(bad.getAddress().getAddress());
out.write((bad.getPort() >> 8) & 0xff);
out.write((bad.getPort() & 0xff));
out.flush();
dest = svr.accept();
bad = (InetSocketAddress) dest.getRemoteSocketAddress();
out.write(PROTO_VERS);
out.write(REQUEST_OK);
out.write(0);
out.write(IPV4);
out.write(bad.getAddress().getAddress());
out.write((bad.getPort() >> 8) & 0xff);
out.write((bad.getPort() & 0xff));
out.flush();
InputStream in2 = dest.getInputStream();
OutputStream out2 = dest.getOutputStream();
Tunnel tunnel = new Tunnel(in2, out);
tunnel.start();
int b = 0;
do {
// Note that the socket might be close from another thread (the tunnel)
try {
b = in.read();
if (b == -1) {
in.close();
out2.close();
return;
}
out2.write(b);
out2.flush();
} catch(IOException ioe) {
}
} while (!client.isClosed());
}
// Handle the SOCKS v5 requests
private void getRequest() throws IOException {
int ver = in.read();
int cmd = in.read();
if (ver == -1 || cmd == -1) {
in.close();
out.close();
return;
}
int rsv = in.read();
int atyp = in.read();
String addr = null;
int port = 0;
switch(atyp) {
case IPV4:
{
byte[] buf = new byte[4];
readBuf(in, buf);
addr = InetAddress.getByAddress(buf).getHostAddress();
}
break;
case DOMAIN_NAME:
{
int i = in.read();
byte[] buf = new byte[i];
readBuf(in, buf);
addr = new String(buf);
}
break;
case IPV6:
{
byte[] buf = new byte[16];
readBuf(in, buf);
addr = InetAddress.getByAddress(buf).getHostAddress();
}
break;
}
port = ((in.read()&0xff) << 8);
port += (in.read()&0xff);
InetSocketAddress socAddr = new InetSocketAddress(addr, port);
switch(cmd) {
case CONNECT:
doConnect(socAddr);
break;
case BIND:
doBind(socAddr);
break;
case UDP_ASSOC:
// doUDP(socAddr);
break;
}
}
public void run() {
String line = null;
try {
if (useV4) {
getRequestV4();
} else {
negociate();
getRequest();
}
} catch (IOException ex) {
try {
sendError(GENERAL_FAILURE);
} catch (Exception e) {
}
} finally {
try {
client.close();
} catch (IOException e2) {
}
}
}
}
public SocksServer(int port, boolean v4) throws IOException {
this(port);
this.useV4 = v4;
}
public SocksServer(int port) throws IOException {
this.port = port;
server = new ServerSocket();
if (port == 0) {
server.bind(null);
this.port = server.getLocalPort();
} else {
server.bind(new InetSocketAddress(port));
}
}
public SocksServer(InetAddress addr, int port, boolean useV4) throws IOException {
this.port = port;
this.useV4 = useV4;
server = new ServerSocket();
if (port == 0 && addr == null) {
server.bind(null);
this.port = server.getLocalPort();
} else if (port == 0 && addr != null) {
server.bind(new InetSocketAddress(addr, 0));
this.port = server.getLocalPort();
} else if (addr == null) {
assert port != 0;
server.bind(new InetSocketAddress(port));
} else {
assert port != 0;
server.bind(new InetSocketAddress(addr, port));
}
}
public SocksServer() throws IOException {
this (DEFAULT_PORT);
}
public void addUser(String user, String passwd) {
users.put(user, passwd);
}
public int getPort() {
return port;
}
public void close() {
done = true;
try { server.close(); } catch (IOException unused) {}
}
public void run() {
ClientHandler cl = null;
while (!done) {
try {
Socket s = server.accept();
cl = new ClientHandler(s);
cl.start();
} catch (IOException ex) {
if (cl != null)
cl.interrupt();
}
}
}
}
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