// Copyright (c) 2003-2014, Jodd Team (jodd.org). All Rights Reserved.
package jodd.http.net;
import jodd.http.HttpException;
import jodd.http.ProxyInfo;
import javax.net.SocketFactory;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
/**
* Socket factory for SOCKS4 proxy. This proxy does not do password authentication.
*
* See: http://www.openssh.com/txt/socks5.protocol for more details.
*/
public class Socks4ProxySocketFactory extends SocketFactory {
private final ProxyInfo proxy;
public Socks4ProxySocketFactory(ProxyInfo proxy) {
this.proxy = proxy;
}
public Socket createSocket(String host, int port) throws IOException {
return createSocks4ProxySocket(host, port);
}
public Socket createSocket(String host, int port, InetAddress localHost, int localPort) throws IOException {
return createSocks4ProxySocket(host, port);
}
public Socket createSocket(InetAddress host, int port) throws IOException {
return createSocks4ProxySocket(host.getHostAddress(), port);
}
public Socket createSocket(InetAddress address, int port, InetAddress localAddress, int localPort) throws IOException {
return createSocks4ProxySocket(address.getHostAddress(), port);
}
/**
* Connects to the SOCKS4 proxy and returns proxified socket.
*/
private Socket createSocks4ProxySocket(String host, int port) throws IOException {
Socket socket = null;
String proxyHost = proxy.getProxyAddress();
int proxyPort = proxy.getProxyPort();
String user = proxy.getProxyUsername();
try {
socket = new Socket(proxyHost, proxyPort);
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
socket.setTcpNoDelay(true);
byte[] buf = new byte[1024];
// 1) CONNECT
int index = 0;
buf[index++] = 4;
buf[index++] = 1;
buf[index++] = (byte) (port >>> 8);
buf[index++] = (byte) (port & 0xff);
InetAddress addr = InetAddress.getByName(host);
byte[] byteAddress = addr.getAddress();
for (int i = 0; i < byteAddress.length; i++) {
buf[index++] = byteAddress[i];
}
if (user != null) {
System.arraycopy(user.getBytes(), 0, buf, index, user.length());
index += user.length();
}
buf[index++] = 0;
out.write(buf, 0, index);
// 2) RESPONSE
int len = 6;
int s = 0;
while (s < len) {
int i = in.read(buf, s, len - s);
if (i <= 0) {
throw new HttpException(ProxyInfo.ProxyType.SOCKS4, "stream is closed");
}
s += i;
}
if (buf[0] != 0) {
throw new HttpException(ProxyInfo.ProxyType.SOCKS4, "proxy returned VN " + buf[0]);
}
if (buf[1] != 90) {
try {
socket.close();
} catch (Exception ignore) {
}
throw new HttpException(ProxyInfo.ProxyType.SOCKS4, "proxy returned CD " + buf[1]);
}
byte[] temp = new byte[2];
in.read(temp, 0, 2);
return socket;
} catch (RuntimeException rtex) {
closeSocket(socket);
throw rtex;
} catch (Exception ex) {
closeSocket(socket);
throw new HttpException(ProxyInfo.ProxyType.SOCKS4, ex.toString(), ex);
}
}
/**
* Closes socket silently.
*/
private void closeSocket(Socket socket) {
try {
if (socket != null) {
socket.close();
}
} catch (Exception ignore) {
}
}
}