2 // $Id: proxy.php,v 1.5 2005/04/10 09:09:13 henoheno Exp $
4 // HTTP Proxy related functions
6 // Max number of 'track' redirection message with 301 or 302 response
7 define('PKWK_HTTP_REQUEST_URL_REDIRECT_MAX', 2);
9 // Separate IPv4 network-address and its netmask
10 define('PKWK_CIDR_NETWORK_REGEX', '/^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})(?:\/([0-9.]+))?$/');
14 * Get / Send data via HTTP request
15 * $url : URI started with http:// (http://user:pass@host:port/path?query)
16 * $method : GET, POST, or HEAD
17 * $headers : Additional HTTP headers, ended with "\r\n"
18 * $post : An array of data to send via POST method ('key'=>'value')
19 * $redirect_max : Max number of HTTP redirect
20 * $content_charset : Content charset. Use '' or CONTENT_CHARSET
22 function http_request($url, $method = 'GET', $headers = '', $post = array(),
23 $redirect_max = PKWK_HTTP_REQUEST_URL_REDIRECT_MAX, $content_charset = '')
25 global $proxy_host, $proxy_port;
26 global $need_proxy_auth, $proxy_auth_user, $proxy_auth_pass;
29 $arr = parse_url($url);
31 $via_proxy = via_proxy($arr['host']);
34 $arr['query'] = isset($arr['query']) ? '?' . $arr['query'] : '';
36 $arr['port'] = isset($arr['port']) ? $arr['port'] : 80;
38 $url_base = $arr['scheme'] . '://' . $arr['host'] . ':' . $arr['port'];
39 $url_path = isset($arr['path']) ? $arr['path'] : '/';
40 $url = ($via_proxy ? $url_base : '') . $url_path . $arr['query'];
42 $query = $method . ' ' . $url . ' HTTP/1.0' . "\r\n";
43 $query .= 'Host: ' . $arr['host'] . "\r\n";
44 $query .= 'User-Agent: PukiWiki/' . S_VERSION . "\r\n";
46 // Basic-auth for HTTP proxy server
47 if ($need_proxy_auth && isset($proxy_auth_user) && isset($proxy_auth_pass))
48 $query .= 'Proxy-Authorization: Basic '.
49 base64_encode($proxy_auth_user . ':' . $proxy_auth_pass) . "\r\n";
51 // (Normal) Basic-auth for remote host
52 if (isset($arr['user']) && isset($arr['pass']))
53 $query .= 'Authorization: Basic '.
54 base64_encode($arr['user'] . ':' . $arr['pass']) . "\r\n";
58 if (strtoupper($method) == 'POST') {
59 // 'application/x-www-form-urlencoded', especially for TrackBack ping
61 foreach ($post as $name=>$val) $POST[] = $name . '=' . urlencode($val);
62 $data = join('&', $POST);
64 if (preg_match('/^[a-zA-Z0-9_-]+$/', $content_charset)) {
66 $query .= 'Content-Type: application/x-www-form-urlencoded' . "\r\n";
68 // With charset (NOTE: Some implementation may hate this)
69 $query .= 'Content-Type: application/x-www-form-urlencoded' .
70 '; charset=' . strtolower($content_charset) . "\r\n";
73 $query .= 'Content-Length: ' . strlen($data) . "\r\n";
83 $via_proxy ? $proxy_host : $arr['host'],
84 $via_proxy ? $proxy_port : $arr['port'],
88 'query' => $query, // Query string
89 'rc' => $errno, // Error number
90 'header' => '', // Header
91 'data' => $errstr // Error message
96 while (! feof($fp)) $response .= fread($fp, 4096);
99 $resp = explode("\r\n\r\n", $response, 2);
100 $rccd = explode(' ', $resp[0], 3); // array('HTTP/1.1', '200', 'OK\r\n...')
101 $rc = (integer)$rccd[1];
104 case 301: // Moved Permanently
105 case 302: // Moved Temporarily
107 if (preg_match('/^Location: (.+)$/m', $resp[0], $matches)
108 && --$redirect_max > 0)
110 $url = trim($matches[1]);
111 if (! preg_match('/^https?:\//', $url)) {
112 // Relative path to Absolute
114 $url = substr($url_path, 0, strrpos($url_path, '/')) . '/' . $url;
115 $url = $url_base . $url; // Add sheme, host
118 return http_request($url, $method, $headers, $post, $redirect_max);
122 'query' => $query, // Query String
123 'rc' => $rc, // Response Code
124 'header' => $resp[0], // Header
125 'data' => $resp[1] // Data
129 // Check HTTP proxy server is needed or not for the $host
130 function via_proxy($host)
132 global $use_proxy, $no_proxy;
134 if (! $use_proxy) return FALSE;
136 $ip = gethostbyname($host);
137 $l_ip = ip2long($ip);
138 $is_valid = (is_long($l_ip) && long2ip($l_ip) == $ip); // Valid IP address
141 foreach ($no_proxy as $network) {
142 if ($is_valid && preg_match(PKWK_CIDR_NETWORK_REGEX, $network, $matches)) {
143 // Sample: '10.0.0.0/8' or '10.0.0.0/255.0.0.0'
144 $l_net = ip2long($matches[1]); // '10.0.0.0'
145 $mask = isset($matches[2]) ? $matches[2] : 32; // '8' or '255.0.0.0'
146 $mask = is_numeric($mask) ?
147 pow(2, 32) - pow(2, 32 - $mask) : // '8' means '8-bit mask'
148 ip2long($mask); // '255.0.0.0' (the same)
150 if (($l_ip & $mask) == $l_net) return FALSE;
152 // Hostname, or a part of hostname
153 if (preg_match('/' . preg_quote($network, '/') . '$/', $host))
158 return TRUE; // Proxy needed