php实现telnet功能

使用php来实现telnet的连接、传递命令、获取返回值等功能！

telnet.php

1. error_reporting(-1);
3. class Telnet {
4. var $sock = NULL;
6. function telnet($host,$port) {
7. $this->sock = fsockopen($host,$port);
8. socket_set_timeout($this->sock,2,0);
9. }
11. function close() {
12. if ($this->sock) fclose($this->sock);
13. $this->sock = NULL;
14. }
16. function write($buffer) {
17. $buffer = str_replace(chr(255),chr(255).chr(255),$buffer);
18. fwrite($this->sock,$buffer);
19. }
21. function getc() {
22. return fgetc($this->sock);
23. }
25. function read_till($what) {
26. $buf = '';
27. while (1) {
28. $IAC = chr(255);
30. $DONT = chr(254);
31. $DO = chr(253);
33. $WONT = chr(252);
34. $WILL = chr(251);
36. $theNULL = chr(0);
38. $c = $this->getc();
40. if ($c === false) return $buf;
41. if ($c == $theNULL) {
42. continue;
43. }
45. if ($c == "1") {
46. continue;
47. }
49. if ($c != $IAC) {
50. $buf .= $c;
52. if ($what == (substr($buf,strlen($buf)-strlen($what)))) {
53. return $buf;
54. }
55. else {
56. continue;
57. }
58. }
60. $c = $this->getc();
62. if ($c == $IAC) {
63. $buf .= $c;
64. }
65. else if (($c == $DO) || ($c == $DONT)) {
66. $opt = $this->getc();
67. // echo "we wont ".ord($opt)."\n";
68. fwrite($this->sock,$IAC.$WONT.$opt);
69. }
70. elseif (($c == $WILL) || ($c == $WONT)) {
71. $opt = $this->getc();
72. // echo "we dont ".ord($opt)."\n";
73. fwrite($this->sock,$IAC.$DONT.$opt);
74. }
75. else {
76. // echo "where are we? c=".ord($c)."\n";
77. }
78. }
79. }
80. }
82. /*
83. ??÷??? ???
84. $telnet = new telnet("192.168.0.1",23);
85. echo $telnet->read_till("login: ");
86. $telnet->write("kongxx\r\n");
87. echo $telnet->read_till("password: ");
88. $telnet->write("KONGXX\r\n");
89. echo $telnet->read_till(":> ");
90. $telnet->write("ls\r\n");
91. echo $telnet->read_till(":> ");
92. echo $telnet->close();
94. */