import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.concurrent.CountDownLatch;
/**
* Created with Intellij IDEA
*
* @author: jiaoyiping
* Mail: [email protected]
* Date: 2018/03/01
* Time: 22:08
* To change this template use File | Settings | Editor | File and Code Templates
*/
public class MySocket5Server implements Runnable {
private static final int SOCKS_PROTOCOL_4 = 0X04;
private static final int SOCKS_PROTOCOL_5 = 0X05;
private static final int DEFAULT_BUFFER_SIZE = 1024;
private static final byte TYPE_IPV4 = 0x01;
private static final byte TYPE_IPV6 = 0X02;
private static final byte TYPE_HOST = 0X03;
private static final byte ALLOW_PROXY = 0X5A;
private static final byte DENY_PROXY = 0X5B;
private Socket sourceSocket;
@Override
public void run() {
String remoteAddress = sourceSocket.getRemoteSocketAddress().toString();
log("process socket:" + remoteAddress);
InputStream sourceIn = null, proxyIn = null;
OutputStream sourceOut = null, proxyOut = null;
Socket proxySocket = null;
try {
sourceIn = sourceSocket.getInputStream();
sourceOut = sourceSocket.getOutputStream();
//从协议头中获取socket的类型
byte[] tmp = new byte[1];
int n = sourceIn.read(tmp);
if (n == 1) {
int protocol = tmp[0];
//socket4
if (SOCKS_PROTOCOL_4 == protocol) {
proxySocket = convertToSocket4(sourceIn, sourceOut);
} else if (SOCKS_PROTOCOL_5 == protocol) {
proxySocket = convertToSocket5(sourceIn, sourceOut);
} else {
log("Socket协议错误,不是Socket4或者Socket5");
}
//socket转换
if (null != proxySocket) {
CountDownLatch countDownLatch = new CountDownLatch(1);
proxyIn = proxySocket.getInputStream();
proxyOut = proxySocket.getOutputStream();
transfer(sourceIn, proxyOut, countDownLatch);
transfer(proxyIn, sourceOut, countDownLatch);
try {
countDownLatch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
} else {
log("SOCKET ERROR: " + tmp.toString());
}
} catch (IOException e) {
e.printStackTrace();
} finally {
closeIO(sourceIn);
closeIO(proxyIn);
closeIO(proxyOut);
closeIO(proxyIn);
closeIO(proxySocket);
closeIO(sourceSocket);
}
}
public MySocket5Server(Socket sourceSocket) {
this.sourceSocket = sourceSocket;
}
private static final void log(String message) {
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(dateFormat.format(new Date()) + " - " + message);
}
private static void startServer(int port) {
log("config =>> port=" + port);
try (ServerSocket serverSocket = new ServerSocket(port)) {
Socket socket = null;
while ((socket = serverSocket.accept()) != null) {
new Thread(new MySocket5Server(socket)).start();
}
log("close socket(this never happen)");
} catch (IOException e) {
e.printStackTrace();
}
}
private Socket convertToSocket4(InputStream inputStream, OutputStream outputStream) throws IOException {
Socket proxySocket = null;
byte[] tmp = new byte[3];
inputStream.read(tmp);
// 请求协议|VN1|CD1|DSTPORT2|DSTIP4|NULL1|
int port = ByteBuffer.wrap(tmp, 1, 2).asShortBuffer().get() & 0xFFFF;
String host = getHost((byte) 0x01, inputStream);
inputStream.read();
//返回一个8字节的响应协议: |VN1|CD1|DSTPORT2|DSTIP 4|
byte[] response = new byte[8];
try {
proxySocket = new Socket(host, port);
response[1] = ALLOW_PROXY;
log("connect " + tmp[1] + "host: " + host + " ,port: " + port);
} catch (Exception e) {
response[1] = DENY_PROXY;
log("connect error,host: " + host + " ,port: " + port);
}
outputStream.write(response);
outputStream.flush();
return proxySocket;
}
private Socket convertToSocket5(InputStream inputStream, OutputStream outputStream) throws IOException {
Socket proxySocket = null;
//处理SOCKS5头信息(不支持登录)
byte[] tmp = new byte[2];
inputStream.read(tmp);
byte method = tmp[1];
if (0x02 == tmp[0]) {
method = 0x00;
inputStream.read();
}
tmp = new byte[]{0x05, method};
outputStream.write(tmp);
outputStream.flush();
byte cmd = 0;
tmp = new byte[4];
inputStream.read(tmp);
log("proxy header is:" + Arrays.toString(tmp));
cmd = tmp[1];
String host = getHost(tmp[3], inputStream);
tmp = new byte[2];
inputStream.read(tmp);
int port = ByteBuffer.wrap(tmp).asShortBuffer().get() & 0xFFFF;
log("connect host: " + host + " :port:" + port);
ByteBuffer rsv = ByteBuffer.allocate(10);
rsv.put((byte) 0x05);
Object resultTmp = null;
try {
if (0x01 == cmd) {
resultTmp = new Socket(host, port);
rsv.put((byte) 0x00);
} else if (0x02 == cmd) {
resultTmp = new ServerSocket(port);
rsv.put((byte) 0x00);
} else {
rsv.put((byte) 0x05);
resultTmp = null;
}
} catch (Exception e) {
rsv.put((byte) 0x05);
resultTmp = null;
}
rsv.put((byte) 0x00);
rsv.put((byte) 0x01);
rsv.put(sourceSocket.getLocalAddress().getAddress());
Short localPort = (short) ((sourceSocket.getLocalPort()) & 0xFFFF);
rsv.putShort(localPort);
tmp = rsv.array();
outputStream.write(tmp);
outputStream.flush();
if (null != resultTmp && 0x02 == cmd) {
ServerSocket ss = (ServerSocket) resultTmp;
try {
resultTmp = ss.accept();
} catch (Exception e) {
} finally {
closeIO(ss);
}
}
return (Socket) resultTmp;
}
private void transfer(InputStream in, OutputStream out, CountDownLatch latch) {
new Thread(() -> {
byte[] bytes = new byte[DEFAULT_BUFFER_SIZE];
int count = 0;
try {
while (0 < (count = in.read(bytes))) {
out.write(bytes, 0, count);
out.flush();
}
} catch (IOException e) {
log("转换出现错误");
e.printStackTrace();
}
if (latch != null) {
latch.countDown();
}
}).start();
}
private void closeIO(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private String getHost(byte type, InputStream inputStream) throws IOException {
String host = null;
byte[] tmp = null;
switch (type) {
case TYPE_IPV4:
tmp = new byte[4];
inputStream.read(tmp);
host = InetAddress.getByAddress(tmp).getHostAddress();
break;
case TYPE_IPV6:
tmp = new byte[16];
inputStream.read(tmp);
host = InetAddress.getByAddress(tmp).getHostAddress();
break;
case TYPE_HOST:
int count = inputStream.read();
tmp = new byte[count];
inputStream.read(tmp);
host = new String(tmp);
default:
break;
}
return host;
}
public static void main(String[] args) {
java.security.Security.setProperty("networkaddress.cache.ttl", "86400");
MySocket5Server.startServer(1033);
}
}