- 论坛徽章:
- 93
|
有需求通过php来连接一些telnet服务器,网上找到了一个现成的实现代码(附于最后),使用时发现会等待结果很久才返回,然后发现是获取返回数据的函数读取socket使用了阻塞读取固定长度1000的数据,而返回的数据有时候并没有这么多从而一直等到超时才返回,如下将函数做了改进与大家分享:- function GetResponse(&$r) {
- echo "Get response...\n";
- $r='';
- $unread_bytes = 1;
- do {
- var_dump($unread_bytes);
- $r.=fread($this->fp,$unread_bytes);
- $s=socket_get_status($this->fp);
- $unread_bytes = $s['unread_bytes'];
- } while ($s['unread_bytes']);
- }
复制代码 当然,如果服务器连一个数据也没有的话还是要阻塞。另外一个疑问,因为telnet服务器有时候会主动推送数据过来,而这个PHPTelnet类需要发送命令后才会等待输出,使用这个代码的话就不能及时得到了服务器推送的数据了。不知道大家有没有好的方案来监听telnet服务器推送数据。我的打算是用socket_select的方式来改造这个类实现推送数据的监听。
- <?php
- /*
- PHPTelnet 1.1.1
- by Antone Roundy
- adapted from code found on the PHP website
- public domain
- */
- class PHPTelnet {
- var $show_connect_error=1;
- var $use_usleep=0; // change to 1 for faster execution
- // don't change to 1 on Windows servers unless you have PHP 5
- var $sleeptime=125000;
- var $loginsleeptime=1000000;
- var $fp=NULL;
- var $loginprompt;
- var $conn1;
- var $conn2;
-
- /*
- 0 = success
- 1 = couldn't open network connection
- 2 = unknown host
- 3 = login failed
- 4 = PHP version too low
- */
- function Connect($server,$user,$pass) {
- $rv=0;
- $vers=explode('.',PHP_VERSION);
- $needvers=array(4,3,0);
- $j=count($vers);
- $k=count($needvers);
- if ($k<$j) $j=$k;
- for ($i=0;$i<$j;$i++) {
- if (($vers[$i]+0)>$needvers[$i]) break;
- if (($vers[$i]+0)<$needvers[$i]) {
- $this->ConnectError(4);
- return 4;
- }
- }
-
- $this->Disconnect();
-
- if (strlen($server)) {
- if (preg_match('/[^0-9.]/',$server)) {
- $ip=gethostbyname($server);
- if ($ip==$server) {
- $ip='';
- $rv=2;
- }
- } else $ip=$server;
- } else $ip='127.0.0.1';
-
- if (strlen($ip)) {
- if ($this->fp=fsockopen($ip,23)) {
- fputs($this->fp,$this->conn1);
- $this->Sleep();
-
- fputs($this->fp,$this->conn2);
- $this->Sleep();
- $this->GetResponse($r);
- $r=explode("\n",$r);
- $this->loginprompt=$r[count($r)-1];
- fputs($this->fp,"$user\r");
- $this->Sleep();
- fputs($this->fp,"$pass\r");
- if ($this->use_usleep) usleep($this->loginsleeptime);
- else sleep(1);
- $this->GetResponse($r);
- $r=explode("\n",$r);
- if (($r[count($r)-1]=='')||($this->loginprompt==$r[count($r)-1])) {
- $rv=3;
- $this->Disconnect();
- }
- } else $rv=1;
- }
-
- if ($rv) $this->ConnectError($rv);
- return $rv;
- }
-
- function Disconnect($exit=1) {
- if ($this->fp) {
- if ($exit) $this->DoCommand('exit',$junk);
- fclose($this->fp);
- $this->fp=NULL;
- }
- }
- function DoCommand($c,&$r) {
- if ($this->fp) {
- fputs($this->fp,"$c\r");
- $this->Sleep();
- $this->GetResponse($r);
- $r=preg_replace("/^.*?\n(.*)\n[^\n]*$/","$1",$r);
- }
- return $this->fp?1:0;
- }
-
- function GetResponse(&$r) {
- $r='';
- do {
- $r.=fread($this->fp,1000);
- $s=socket_get_status($this->fp);
- } while ($s['unread_bytes']);
- }
-
- function Sleep() {
- if ($this->use_usleep) usleep($this->sleeptime);
- else sleep(1);
- }
-
- function PHPTelnet() {
- $this->conn1=chr(0xFF).chr(0xFB).chr(0x1F).chr(0xFF).chr(0xFB).
- chr(0x20).chr(0xFF).chr(0xFB).chr(0x18).chr(0xFF).chr(0xFB).
- chr(0x27).chr(0xFF).chr(0xFD).chr(0x01).chr(0xFF).chr(0xFB).
- chr(0x03).chr(0xFF).chr(0xFD).chr(0x03).chr(0xFF).chr(0xFC).
- chr(0x23).chr(0xFF).chr(0xFC).chr(0x24).chr(0xFF).chr(0xFA).
- chr(0x1F).chr(0x00).chr(0x50).chr(0x00).chr(0x18).chr(0xFF).
- chr(0xF0).chr(0xFF).chr(0xFA).chr(0x20).chr(0x00).chr(0x33).
- chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0x2C).chr(0x33).
- chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0xFF).chr(0xF0).
- chr(0xFF).chr(0xFA).chr(0x27).chr(0x00).chr(0xFF).chr(0xF0).
- chr(0xFF).chr(0xFA).chr(0x18).chr(0x00).chr(0x58).chr(0x54).
- chr(0x45).chr(0x52).chr(0x4D).chr(0xFF).chr(0xF0);
- $this->conn2=chr(0xFF).chr(0xFC).chr(0x01).chr(0xFF).chr(0xFC).
- chr(0x22).chr(0xFF).chr(0xFE).chr(0x05).chr(0xFF).chr(0xFC).chr(0x21);
- }
-
- function ConnectError($num) {
- if ($this->show_connect_error) switch ($num) {
- case 1: echo '<br />[PHP Telnet] <a href="http://www.geckotribe.com/php-telnet/errors/fsockopen.php">Connect failed: Unable to open network connection</a><br />'; break;
- case 2: echo '<br />[PHP Telnet] <a href="http://www.geckotribe.com/php-telnet/errors/unknown-host.php">Connect failed: Unknown host</a><br />'; break;
- case 3: echo '<br />[PHP Telnet] <a href="http://www.geckotribe.com/php-telnet/errors/login.php">Connect failed: Login failed</a><br />'; break;
- case 4: echo '<br />[PHP Telnet] <a href="http://www.geckotribe.com/php-telnet/errors/php-version.php">Connect failed: Your server\'s PHP version is too low for PHP Telnet</a><br />'; break;
- }
- }
- }
- return;
- ?>
复制代码 |
|