phptelnet功能实现代码

本节内容： php telnet功能实例

文件：telnet.php

3. error_reporting(-1);

4. //telnet功能类

5. class Telnet {
6. var $sock = NULL;
8. function telnet($host,$port) {
9. $this->sock = fsockopen($host,$port);
10. socket_set_timeout($this->sock,2,0);
11. }

12. function close() {

13. if ($this->sock) fclose($this->sock);
14. $this->sock = NULL;
15. }
17. function write($buffer) {
18. $buffer = str_replace(chr(255),chr(255).chr(255),$buffer);
19. fwrite($this->sock,$buffer);
20. }
22. function getc() {
23. return fgetc($this->sock);
24. }

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. }

48. if ($c != $IAC) {

49. $buf .= $c;
51. if ($what == (substr($buf,strlen($buf)-strlen($what)))) {
52. return $buf;
53. }
54. else {
55. continue;
56. }
57. } // bbs.it-home.org

58. $c = $this->getc();

60. if ($c == $IAC) {
61. $buf .= $c;
62. }
63. else if (($c == $DO) || ($c == $DONT)) {
64. $opt = $this->getc();
65. // echo "we wont ".ord($opt)."\n";
66. fwrite($this->sock,$IAC.$WONT.$opt);
67. }
68. elseif (($c == $WILL) || ($c == $WONT)) {
69. $opt = $this->getc();
70. // echo "we dont ".ord($opt)."\n";
71. fwrite($this->sock,$IAC.$DONT.$opt);
72. }
73. else {
74. // echo "where are we? c=".ord($c)."\n";
75. }
76. }
77. }
78. }

79. /*

80. 使用方法
81. telnet类的调用
82. $telnet = new telnet("192.168.0.1",23);
83. echo $telnet->read_till("login: ");
84. $telnet->write("kongxx\r\n");
85. echo $telnet->read_till("password: ");
86. $telnet->write("KONGXX\r\n");
87. echo $telnet->read_till(":> ");
88. $telnet->write("ls\r\n");
89. echo $telnet->read_till(":> ");
90. echo $telnet->close();
91. */