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 = dest.getInputStream();
OutputStream out2 = 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);
} 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);
} catch (IOException ioe) {
}
} while (!client.isClosed());
}
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 = dest.getInputStream();
OutputStream out2 = 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);
} catch (IOException ex) {
}
} while (!client.isClosed());
}
}