Sample_PHP tutorial on using fork and socket on php

最近剛好遇到一個頭大的問題寫了這個code讓大家參考一下吧
家裏的無線AP功能不太好，他只提供把外部真實IP map 到 Nat裡面的某個IP
不能指定某個port map到某個內部IP的Port
可是我已經把外部的IP Map到內部的Linux);" href="javascript:;" target=_self>Linux Server上，
但是我又想從外部使用VNC連到內部的一台Windows電腦。
所以就寫了這個程式
原理是這樣

這個程式會在Linux Server上開一個Port作Listen的動作
當外部連到這個Port時，程式會再開啟另一個連線連到內部Windows的VNC上
把外部的封包原封不動的丟到VNC的連線上，然後把VNC連線傳回的資料原封不動的再丟回外部的Port

程式碼:

<br><font face="NSimsun">#!/usr/bin/php -q<br></font><font color="#000000"><font face="NSimsun"><font color="#0000bb"><?php<BR> $IP</FONT><FONT color=#007700>=</FONT><FONT color=#dd0000>192.168.1.1</FONT><FONT color=#007700>;</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>//Windows電腦的IP<BR> </FONT><FONT color=#0000bb>$Port</FONT><FONT color=#007700>=</FONT><FONT color=#dd0000>5900</FONT><FONT color=#007700>;        </FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>//VNC使用的Port<BR> </FONT><FONT color=#0000bb>$ServerPort</FONT><FONT color=#007700>=</FONT><FONT color=#dd0000>9999</FONT><FONT color=#007700>;</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>//Linux Server對外使用的Port<BR> </FONT><FONT color=#0000bb>$RemoteSocket</FONT><FONT color=#007700>=</FONT><FONT color=#0000bb>false</FONT><FONT color=#007700>;</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>//連線到VNC的Socket<BR> </FONT><FONT color=#007700>function</FONT><FONT color=#0000bb>SignalFunction</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;$Signal&#41;<BR> </FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#123;<BR>   //這是主Process的訊息處理函數<BR>  </FONT><FONT color=#007700>global</FONT><FONT color=#0000bb>$PID</FONT><FONT color=#007700>;</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>//Child Process的PID<BR>  </FONT><FONT color=#007700>switch &</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;$Signal&#41;<BR>  </FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#123;<BR>   </FONT><FONT color=#007700>case</FONT><FONT color=#0000bb>SIGTRAP</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#58;<BR>   </FONT><FONT color=#007700>case</FONT><FONT color=#0000bb>SIGTERM</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#58;<BR>    //收到結束程式的Signal<BR>    </FONT><FONT color=#007700>if&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;$PID&#41;<BR>    </FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#123;<BR>     //送一個SIGTERM的訊號給Child告訴他趕快結束掉嘍<BR>     </FONT><FONT color=#0000bb>posix_kill</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;$PID,SIGTERM&#41;;<BR>     //等待Child Process結束，避免zombie<BR>     </FONT><FONT color=#0000bb>pcntl_wait</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;$Status&#41;;<BR>    </FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#125;<BR>    //關閉主Process開啟的Socket<BR>    </FONT><FONT color=#0000bb>DestroySocket</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;&#41;;<BR>    </FONT><FONT color=#007700>exit&</FONT></FONT><FONT face=NSimsun color=#ff8000>#40;0&#41;; //結束主Process<BR>    </FONT><FONT face=NSimsun><FONT color=#007700>break;<BR>   case</FONT><FONT color=#0000bb>SIGCHLD</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#58;<BR>    /*<BR>當Child Process結束掉時，Child會送一個SIGCHLD訊號給Parrent<BR>當Parrent收到SIGCHLD，就知道Child Process已經結束嘍 ，該做一些<BR>結束的動作*/<BR>    </FONT><FONT color=#007700>unset&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;$PID&#41;; //將$PID清空，表示Child Process已經結束<BR>    </FONT><FONT color=#0000bb>pcntl_wait</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun color=#ff8000>#40;$Status&#41;; //避免Zombie<BR>    </FONT><FONT face=NSimsun color=#007700>break;<BR>   default&</FONT><FONT face=NSimsun><FONT color=#ff8000>#58;<BR>  </FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#125;<BR> </FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#125;<BR> </FONT><FONT color=#007700>function</FONT><FONT color=#0000bb>ChildSignalFunction</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;$Signal&#41;<BR> </FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#123;<BR>//This is the message processing function of Child Process <BR> </FONT><FONT color=#007700>switch &</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;$Signal&#41;<BR> </FONT><FONT color=#007700> &</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#123;<BR> </FONT><FONT color=#007700>case</FONT><FONT color=#0000bb>SIGTRAP</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#58;<BR> </FONT><FONT color=#007700>case</FONT><FONT color=#0000bb>SIGTERM</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#58;<BR>//Child Process received the end message<BR> </FONT><FONT color=#0000bb>DestroySocket</FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;&#41;; //Close Socket<BR> </FONT><FONT color=#007700>exit&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#40;0&#41;; //End Child Process<BR> </FONT><FONT color=#007700>default&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#58;<BR> </FONT><FONT color=#007700>&</FONT></FONT><FONT face=NSimsun><FONT color=#ff8000>#125;<BR> ></FONT>&#125;<FONT color=#007700> ;</FONT> </FONT><FONT face=NSimsun>&<FONT color=#ff8000><BR></FONT><FONT color=#007700>#123;</FONT> //Child Process Socket processing function<FONT color=#0000bb> //$ConnectedServerSocket -> Externally connected Socket</font> <font color="#007700"></font>global</font><font face="NSimsun">$ServerSocket<font color="#ff8000"><br>,</font><font color="#007700">$RemoteSocket</font></font>,<font face="NSimsun"><font color="#ff8000">$IP<br><br>,<br></font>$Port<font color="#007700"></font><font color="#0000bb"></font>;<font color="#007700"> >$ConnectedServerSocket</font><font color="#0000bb"></font>;<font color="#007700"> declare </font>
<font color="#0000bb"></font><font color="#007700">http://www.bkjia.com/PHPjc/508267.html</font><font color="#0000bb">www.bkjia.com</font></font>true<font face="NSimsun"><font color="#007700">http: //www.bkjia.com/PHPjc/508267.html<br></font>TechArticle<font color="#0000bb"></font>I just encountered a big problem recently and wrote this code for your reference. Does the wireless AP function at home work? Great, it only provides mapping of the external real IP to a certain IP in Nat. It cannot refer to...<font color="#007700"></font><font color="#0000bb"></font>
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