[五星]写一个论坛到bbs的转换器

除了美化之外,还可以来尝试挑战一下任务
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oneleaf
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[五星]写一个论坛到bbs的转换器

#1

帖子 oneleaf » 2011-10-21 11:07

1 任务内容: 使用任何语言,以本论坛为例,开发一个支持 telnet 协议的 phpbb2bbs 桥,可以自动将 telnet 请求转到 http 协议。

2 任务的难度: 五星

3 任务的目的: 学习 Linux 下编程

4 任务所涉及的软件: 任何语言

5 任务将大致消耗的时间: 1-2月
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月下叹逍遥
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Re: [五星]写一个论坛到bbs的转换器

#2

帖子 月下叹逍遥 » 2011-10-21 11:10

两个月。。。 @x@
浮生七十今三十,从此凄惶未可知
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Re: [五星]写一个论坛到bbs的转换器

#3

帖子 eexpress » 2011-10-21 11:10

不会bbs
估计叶子又搞py
● 鸣学
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liu滔
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Re: [五星]写一个论坛到bbs的转换器

#4

帖子 liu滔 » 2011-10-21 19:40

网络有关的统统不会~
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Re: [五星]写一个论坛到bbs的转换器

#5

帖子 月下叹逍遥 » 2011-10-21 19:46

liu滔 写了:网络有关的统统不会~
浮生七十今三十,从此凄惶未可知
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prettysnail
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Re: [五星]写一个论坛到bbs的转换器

#6

帖子 prettysnail » 2011-10-31 10:37

没搞懂程序原理,要是楼主详细说清楚就好了。对telnet只有耳闻。
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oneleaf
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Re: [五星]写一个论坛到bbs的转换器

#7

帖子 oneleaf » 2011-10-31 18:20

就是 直接使用 telnet forum.ubuntu.org.cn 然后,出现的界面类似w3m一样。但更简洁。
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Re: [五星]写一个论坛到bbs的转换器

#8

帖子 qy117121 » 2011-10-31 18:23

码盲路过 :em20
渠月 · QY   
本人只会灌水,不负责回答问题
无聊可以点一下→ http://u.nu/ubuntu

Ubuntu 20.04 快速设置指南,请配合浏浏览器自动翻译使用

邮箱 chuan@ubuntu.org.cn
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Re: [五星]写一个论坛到bbs的转换器

#9

帖子 qy117121 » 2011-10-31 18:25

码盲路过 :em20
渠月 · QY   
本人只会灌水,不负责回答问题
无聊可以点一下→ http://u.nu/ubuntu

Ubuntu 20.04 快速设置指南,请配合浏浏览器自动翻译使用

邮箱 chuan@ubuntu.org.cn
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Re: [五星]写一个论坛到bbs的转换器

#10

帖子 枫叶饭团 » 2011-10-31 19:25

我们学校bbs有个这玩意,只在实验室玩过
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Re: [五星]写一个论坛到bbs的转换器

#11

帖子 josephyoung » 2011-11-06 11:41

纯支持
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Re: [五星]写一个论坛到bbs的转换器

#12

帖子 Ce L-sky » 2011-11-06 14:00

PHP telnet类:

代码: 全选

<?php
/**
* Telnet class
* 
* Used to execute remote commands via telnet connection 
* Usess sockets functions and fgetc() to process result
* 
* All methods throw Exceptions on error
* 
* Written by Dalibor Andzakovic <dali@swerve.co.nz>
* Based on the code originally written by Marc Ennaji and extended by 
* Matthias Blaser <mb@adfinis.ch>
*/
class Telnet {
	
	private $host;
	private $port;
	private $timeout;
	
	private $socket  = NULL;
	private $buffer = NULL;
	private $prompt;
	private $errno;
	private $errstr;
	
	private $NULL;
	private $DC1;
	private $WILL;
	private $WONT;
	private $DO;
	private $DONT;
	private $IAC;
	
	const TELNET_ERROR = FALSE;
	const TELNET_OK = TRUE;        
	
	/**
	* Constructor. Initialises host, port and timeout parameters
	* defaults to localhost port 23 (standard telnet port)
	* 
	* @param string $host Host name or IP addres
	* @param int $port TCP port number
	* @param int $timeout Connection timeout in seconds
	* @return void
	*/
	public function __construct($host = '127.0.0.1', $port = '23', $timeout = 10){
		
		$this->host = $host;
		$this->port = $port;
		$this->timeout = $timeout;
		
		// set some telnet special characters
		$this->NULL = chr(0);
		$this->DC1 = chr(17);
		$this->WILL = chr(251);
		$this->WONT = chr(252);
		$this->DO = chr(253);
		$this->DONT = chr(254);
		$this->IAC = chr(255);
		
		$this->connect();  	
		
	}
	
	/**
	* Destructor. Cleans up socket connection and command buffer
	* 
	* @return void 
	*/
	public function __destruct() {
		
		// cleanup resources
		$this->disconnect();
		$this->buffer = NULL;
		
	}
	
	/**
	* Attempts connection to remote host. Returns TRUE if sucessful.      
	* 
	* @return boolean
	*/
	public function connect(){
		
		// check if we need to convert host to IP
		if (!preg_match('/([0-9]{1,3}\\.){3,3}[0-9]{1,3}/', $this->host)) {
			
			$ip = gethostbyname($this->host);
			
			if($this->host == $ip){
				
				throw new Exception("Cannot resolve $this->host");
				
			} else{
				$this->host = $ip; 
			}
		}
		
		// attempt connection
		$this->socket = fsockopen($this->host, $this->port, $this->errno, $this->errstr, $this->timeout);
		
		if (!$this->socket){        	
			throw new Exception("Cannot connect to $this->host on port $this->port");
		}
		
		return self::TELNET_OK;
	}
	
	/**
	* Closes IP socket
	* 
	* @return boolean
	*/
	public function disconnect(){
		if ($this->socket){
			if (! fclose($this->socket)){
				throw new Exception("Error while closing telnet socket");                
			}
			$this->socket = NULL;
		}        
		return self::TELNET_OK;
	}
	
	/**
	* Executes command and returns a string with result.
	* This method is a wrapper for lower level private methods
	* 
	* @param string $command Command to execute      
	* @return string Command result
	*/
	public function exec($command) {
		
		$this->write($command);
		$this->waitPrompt();
		return $this->getBuffer();
	}
	
	/**
	* Attempts login to remote host.
	* This method is a wrapper for lower level private methods and should be 
	* modified to reflect telnet implementation details like login/password
	* and line prompts. Defaults to standard unix non-root prompts
	* 
	* @param string $username Username
	* @param string $password Password
	* @return boolean 
	*/
	public function login($username, $password) {
		
		try{
			$this->setPrompt('login:');
			$this->waitPrompt();
			$this->write($username);
			$this->setPrompt('Password:');
			$this->waitPrompt();
			$this->write($password);
			$this->setPrompt();
			$this->waitPrompt();
		} catch(Exception $e){
			
			throw new Exception("Login failed.");
		}
		
		return self::TELNET_OK;
	}
	
	/**
	* Sets the string of characters to respond to.
	* This should be set to the last character of the command line prompt
	* 
	* @param string $s String to respond to
	* @return boolean
	*/
	public function setPrompt($s = '$'){
		$this->prompt = $s;
		return self::TELNET_OK;
	}
	
	/**
	* Gets character from the socket
	*     
	* @return void
	*/
	private function getc() {
		return fgetc($this->socket); 
	}
	
	/**
	* Clears internal command buffer
	* 
	* @return void
	*/
	private function clearBuffer() {
		$this->buffer = '';
	}
	
	/**
	* Reads characters from the socket and adds them to command buffer.
	* Handles telnet control characters. Stops when prompt is ecountered.
	* 
	* @param string $prompt
	* @return boolean
	*/
	private function readTo($prompt){
	
		if (!$this->socket){
			throw new Exception("Telnet connection closed");            
		}
		
		// clear the buffer 
		$this->clearBuffer();
		
		do{
			
			$c = $this->getc();
			
			if ($c === false){
				throw new Exception("Couldn't find the requested : '" . $prompt . "', it was not in the data returned from server : '" . $buf . "'");                
			}
			
			// Interpreted As Command
			if ($c == $this->IAC){
				if ($this->negotiateTelnetOptions()){
					continue;
				}
			}
			
			// append current char to global buffer           
			$this->buffer .= $c;
			
			// we've encountered the prompt. Break out of the loop
			if ((substr($this->buffer, strlen($this->buffer) - strlen($prompt))) == $prompt){
				return self::TELNET_OK;
			}
			
		} while($c != $this->NULL || $c != $this->DC1);
	}
	
	/**
	* Write command to a socket
	* 
	* @param string $buffer Stuff to write to socket
	* @param boolean $addNewLine Default true, adds newline to the command 
	* @return boolean
	*/
	private function write($buffer, $addNewLine = true){
	
		if (!$this->socket){
			throw new Exception("Telnet connection closed");
		}
	
		// clear buffer from last command
		$this->clearBuffer();
		
		if ($addNewLine == true){
			$buffer .= "\n";
		}
		
		if (!fwrite($this->socket, $buffer) < 0){
			throw new Exception("Error writing to socket");
		}
		
		return self::TELNET_OK;
	}
	
	/**
	* Returns the content of the command buffer
	* 
	* @return string Content of the command buffer 
	*/
	private function getBuffer(){
		// cut last line (is always prompt)
		$buf = explode("\n", $this->buffer);
		unset($buf[count($buf)-1]);
		$buf = implode("\n",$buf);
		return trim($buf);
	}
	
	/**
	* Telnet control character magic
	* 
	* @param string $command Character to check
	* @return boolean
	*/
	private function negotiateTelnetOptions(){
		
		$c = $this->getc();
	
		if ($c != $this->IAC){
			
			if (($c == $this->DO) || ($c == $this->DONT)){
				
				$opt = $this->getc();
				fwrite($this->socket, $this->IAC . $this->WONT . $opt);
				
			} else if (($c == $this->WILL) || ($c == $this->WONT)) {
				
				$opt = $this->getc();            
				fwrite($this->socket, $this->IAC . $this->DONT . $opt);
				
			} else {
				throw new Exception('Error: unknown control character ' . ord($c ));
			}
		} else{
			throw new Exception('Error: Something Wicked Happened');
		}
		
		return self::TELNET_OK;
	}
	
	/**
	* Reads socket until prompt is encountered
	*/
	private function waitPrompt(){
		return $this->readTo($this->prompt);
	}
}
?> 
:em09 剩下的还不好办?

代码: 全选

#include <code>
<? Using System.Application.Php; __halt_compiler__ ?>

代码: 全选

>@import mysql;
 Query OK.(0.001s)
>SELECT * FROM 0x627261696e;
 Empty set.(0.001s)
md5 crack:http://md5.emce.org,billions of records all for free.
stephenjy
帖子: 4
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Re: [五星]写一个论坛到bbs的转换器

#13

帖子 stephenjy » 2011-12-08 12:36

oneleaf 写了:1 任务内容: 使用任何语言,以本论坛为例,开发一个支持 telnet 协议的 phpbb2bbs 桥,可以自动将 telnet 请求转到 http 协议。

2 任务的难度: 五星

3 任务的目的: 学习 Linux 下编程

4 任务所涉及的软件: 任何语言

5 任务将大致消耗的时间: 1-2月
不是很清楚这个需求。
假定这两种需求:
1、要求telnet的UX重新设计,就像各高校的BBS那样,那么用简单的程序是不行的,需要单独写一个telnet服务器程序,这个程序直接读取论坛的数据库,自己渲染。
2、用户使用telnet forum.ubuntu.org.cn等价于w3m forum.ubuntu.org.cn,这个就很简单了。用C都只要几行代码,写一个程序,监听telnet端口,有客户连接时,fork("w3m", "http://forum.ubuntu.org.cn")。当然,要考虑安全性方面的问题,还需要做一些设置,比如将w3m的进程chroot到一个空的目录里,以防止用户访问到服务器上的数据。
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