php下载获取远程图片函数(可伪造来路)

2. //下载获取远程图片
3. function DownImageKeep($gurl, $rfurl, $filename, $gcookie="", $JumpCount=0, $maxtime=30)
4. {
5. $urlinfos = GetHostInfo($gurl);
6. $ghost = trim($urlinfos['host']);
7. if($ghost=='')
8. {
9. return FALSE;
10. }
11. $gquery = $urlinfos['query'];
12. if($gcookie=="" && !empty($rfurl))
13. {
14. $gcookie = RefurlCookie($rfurl);
15. }
16. $sessionQuery = "GET $gquery HTTP/1.1\r\n";
17. $sessionQuery .= "Host: $ghost\r\n";
18. $sessionQuery .= "Referer: $rfurl\r\n";
19. $sessionQuery .= "Accept: */*\r\n";
20. $sessionQuery .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)\r\n";
21. if($gcookie!="" && !preg_match("/[\r\n]/", $gcookie))
22. {
23. $sessionQuery .= $gcookie."\r\n";
24. }
25. $sessionQuery .= "Connection: Keep-Alive\r\n\r\n";
26. $errno = "";
27. $errstr = "";
28. $m_fp = fsockopen($ghost, 80, $errno, $errstr,10);
29. fwrite($m_fp,$sessionQuery);
30. $lnum = 0;
32. //获取详细应答头
33. $m_httphead = Array();
34. $httpstas = explode(" ",fgets($m_fp,256));
35. $m_httphead["http-edition"] = trim($httpstas[0]);
36. $m_httphead["http-state"] = trim($httpstas[1]);
37. while(!feof($m_fp))
38. {
39. $line = trim(fgets($m_fp,256));
40. if($line == "" || $lnum>100)
41. {
42. break;
43. }
44. $hkey = "";
45. $hvalue = "";
46. $v = 0;
47. for($i=0; $i {
48. if($v==1)
49. {
50. $hvalue .= $line[$i];
51. }
52. if($line[$i]==":")
53. {
54. $v = 1;
55. }
56. if($v==0)
57. {
58. $hkey .= $line[$i];
59. }
60. }
61. $hkey = trim($hkey);
62. if($hkey!="")
63. {
64. $m_httphead[strtolower($hkey)] = trim($hvalue);
65. }
66. }
68. //分析返回记录
69. if(preg_match("/^3/", $m_httphead["http-state"]))
70. {
71. if(isset($m_httphead["location"]) && $JumpCount {
72. $JumpCount++;
73. DownImageKeep($gurl,$rfurl,$filename,$gcookie,$JumpCount);
74. }
75. else
76. {
77. return FALSE;
78. }
79. }
80. if(!preg_match("/^2/", $m_httphead["http-state"]))
81. {
82. return FALSE;
83. }
84. if(!isset($m_httphead))
85. {
86. return FALSE;
87. }
88. $contentLength = $m_httphead['content-length'];
90. //保存文件
91. $fp = fopen($filename,"w") or die("写入文件：{$filename} 失败！");
92. $i=0;
93. $okdata = "";
94. $starttime = time();
95. while(!feof($m_fp))
96. {
97. $okdata .= fgetc($m_fp);
98. $i++;
100. //超时结束
101. if(time()-$starttime>$maxtime)
102. {
103. break;
104. }
106. //到达指定大小结束
107. if($i >= $contentLength)
108. {
109. break;
110. }
111. }
112. if($okdata!="")
113. {
114. fwrite($fp,$okdata);
115. }
116. fclose($fp);
117. if($okdata=="")
118. {
119. @unlink($filename);
120. fclose($m_fp);
121. return FALSE;
122. }
123. fclose($m_fp);
124. return TRUE;
125. }
127. /**
128. * 获得某页面返回的Cookie信息
129. *
130. * @access public
131. * @param string $gurl 调整地址
132. * @return string
133. */
134. function RefurlCookie($gurl)
135. {
136. global $gcookie,$lastRfurl;
137. $gurl = trim($gurl);
138. if(!empty($gcookie) && $lastRfurl==$gurl)
139. {
140. return $gcookie;
141. }
142. else
143. {
144. $lastRfurl=$gurl;
145. }
146. if(trim($gurl)=='')
147. {
148. return '';
149. }
150. $urlinfos = GetHostInfo($gurl);
151. $ghost = $urlinfos['host'];
152. $gquery = $urlinfos['query'];
153. $sessionQuery = "GET $gquery HTTP/1.1\r\n";
154. $sessionQuery .= "Host: $ghost\r\n";
155. $sessionQuery .= "Accept: */*\r\n";
156. $sessionQuery .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)\r\n";
157. $sessionQuery .= "Connection: Close\r\n\r\n";
158. $errno = "";
159. $errstr = "";
160. $m_fp = fsockopen($ghost, 80, $errno, $errstr,10) or die($ghost.'
     ');
161. fwrite($m_fp,$sessionQuery);
162. $lnum = 0;
164. //获取详细应答头
165. $gcookie = "";
166. while(!feof($m_fp))
167. {
168. $line = trim(fgets($m_fp,256));
169. if($line == "" || $lnum>100)
170. {
171. break;
172. }
173. else
174. {
175. if(preg_match("/^cookie/i", $line))
176. {
177. $gcookie = $line;
178. break;
179. }
180. }
181. }
182. fclose($m_fp);
183. return $gcookie;
184. }
186. /**
187. * 获得网址的host和query部份
188. *
189. * @access public
190. * @param string $gurl 调整地址
191. * @return string
192. */
193. function GetHostInfo($gurl)
194. {
195. $gurl = preg_replace("/^http:\/\//i", "", trim($gurl));
196. $garr['host'] = preg_replace("/\/(.*)$/i", "", $gurl);
197. $garr['query'] = "/".preg_replace("/^([^\/]*)\//i", "", $gurl);
198. return $garr;
199. }
200. ?>

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