Wordpress 3.5.2

[autoinstalls/wordpress.git] / wp-includes / http.php

diff --git a/wp-includes/http.php b/wp-includes/http.php
index 56e4f9ff20a7725c2fc6600da028ca14497011a4..a196f688b8031c5d1d5e4775454938435d20f490 100644 (file)
--- a/wp-includes/http.php
+++ b/wp-includes/http.php
@@ -311,3 +311,64 @@ function send_origin_headers() {
 
        return false;
 }
+
+/**
+ * Validate a URL for safe use in the HTTP API.
+ *
+ * @since 3.5.2
+ *
+ * @return mixed URL or false on failure.
+ */
+function wp_http_validate_url( $url ) {
+       $url = esc_url_raw( $url, array( 'http', 'https' ) );
+       if ( ! $url )
+               return false;
+
+       $parsed_url = @parse_url( $url );
+       if ( ! $parsed_url )
+               return false;
+
+       if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) )
+               return false;
+
+       if ( false !== strpos( $parsed_url['host'], ':' ) )
+               return false;
+
+       $parsed_home = @parse_url( get_option( 'home' ) );
+
+       $same_host = strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] );
+
+       if ( ! $same_host ) {
+               $host = trim( $parsed_url['host'], '.' );
+               if ( preg_match( '#^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$#', $host ) ) {
+                       $ip = $host;
+               } else {
+                       $ip = gethostbyname( $host );
+                       if ( $ip === $host ) // Error condition for gethostbyname()
+                               $ip = false;
+               }
+               if ( $ip ) {
+                       if ( '127.0.0.1' === $ip )
+                               return false;
+                       $parts = array_map( 'intval', explode( '.', $ip ) );
+                       if ( 10 === $parts[0] )
+                               return false;
+                       if ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
+                               return false;
+                       if ( 192 === $parts[0] && 168 === $parts[1] )
+                               return false;
+               }
+       }
+
+       if ( empty( $parsed_url['port'] ) )
+               return $url;
+
+       $port = $parsed_url['port'];
+       if ( 80 === $port || 443 === $port || 8080 === $port )
+               return $url;
+
+       if ( $parsed_home && $same_host && $parsed_home['port'] === $port )
+               return $url;
+
+       return false;
+}