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php来实现telnet的连接、传递命令、获取返回值等功能！
- error_reporting(-1);
-
- class Telnet {
- var $sock = NULL;
-
- function telnet($host,$port) {
- $this->sock = fsockopen($host,$port);
- socket_set_timeout($this->sock,2,0);
- }
-
- function close() {
- if ($this->sock) fclose($this->sock);
- $this->sock = NULL;
- }
-
- function write($buffer) {
- $buffer = str_replace(chr(255),chr(255).chr(255),$buffer);
- fwrite($this->sock,$buffer);
- }
-
- function getc() {
- return fgetc($this->sock);
- }
-
- function read_till($what) {
- $buf = '';
- while (1) {
- $IAC = chr(255);
-
- $DONT = chr(254);
- $DO = chr(253);
-
- $WONT = chr(252);
- $WILL = chr(251);
-
- $theNULL = chr(0);
-
- $c = $this->getc();
-
- if ($c === false) return $buf;
- if ($c == $theNULL) {
- continue;
- }
-
- if ($c == "1") {
- continue;
- }
-
- if ($c != $IAC) {
- $buf .= $c;
-
- if ($what == (substr($buf,strlen($buf)-strlen($what)))) {
- return $buf;
- }
- else {
- continue;
- }
- }
-
- $c = $this->getc();
-
- if ($c == $IAC) {
- $buf .= $c;
- }
- else if (($c == $DO) || ($c == $DONT)) {
- $opt = $this->getc();
- // echo "we wont ".ord($opt)."n";
- fwrite($this->sock,$IAC.$WONT.$opt);
- }
- elseif (($c == $WILL) || ($c == $WONT)) {
- $opt = $this->getc();
- // echo "we dont ".ord($opt)."n";
- fwrite($this->sock,$IAC.$DONT.$opt);
- }
- else {
- // echo "where are we? c=".ord($c)."n";
- }
- }
- }
- }
-
- /*
- $telnet = new telnet("192.168.0.1",23);
- echo $telnet->read_till("login: ");
- $telnet->write("kongxxrn");
- echo $telnet->read_till("password: ");
- $telnet->write("KONGXXrn");
- echo $telnet->read_till(":> ");
- $telnet->write("lsrn");
- echo $telnet->read_till(":> ");
- echo $telnet->close();
-
- */
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