Changeset 41629 for trunk/src/wp-includes/wp-db.php

Timestamp:

09/28/2017 05:36:34 AM (9 years ago)

Author:

pento

Message:

Database: Add support for connecting to IPv6 hosts

IPv4 addresses are scarce, overworked, and underpaid. They're ready to retire, but we just won't let them go. If you care about their wellbeing, switch to IPv6 today.

Props schlessera, birgire.
Fixes #41722.

File:

• trunk/src/wp-includes/wp-db.php (modified) (3 diffs)

trunk/src/wp-includes/wp-db.php

@@ -1461 +1461 @@
                         $this->dbh = mysqli_init();
 
-                        // mysqli_real_connect doesn't support the host param including a port or socket
-                        // like mysql_connect does. This duplicates how mysql_connect detects a port and/or socket file.
-                        $port = null;
-                        $socket = null;
-                        $host = $this->dbhost;
-                        $port_or_socket = strstr( $host, ':' );
-                        if ( ! empty( $port_or_socket ) ) {
-                                $host = substr( $host, 0, strpos( $host, ':' ) );
-                                $port_or_socket = substr( $port_or_socket, 1 );
-                                if ( 0 !== strpos( $port_or_socket, '/' ) ) {
-                                        $port = intval( $port_or_socket );
-                                        $maybe_socket = strstr( $port_or_socket, ':' );
-                                        if ( ! empty( $maybe_socket ) ) {
-                                                $socket = substr( $maybe_socket, 1 );
-                                        }
-                                } else {
-                                        $socket = $port_or_socket;
-                                }
+                        $host    = $this->dbhost;
+                        $port    = null;
+                        $socket  = null;
+                        $is_ipv6 = false;
+                        
+                        if ( $host_data = $this->parse_db_host( $this->dbhost ) ) {
+                                list( $host, $port, $socket, $is_ipv6 ) = $host_data;
+                        }
+
+                        /*
+                         * If using the `mysqlnd` library, the IPv6 address needs to be
+                         * enclosed in square brackets, whereas it doesn't while using the
+                         * `libmysqlclient` library.
+                         * @see https://bugs.php.net/bug.php?id=67563
+                         */
+                        if ( $is_ipv6 && extension_loaded( 'mysqlnd' ) ) {
+                                $host = "[$host]";
                         }
 
@@ -1490 +1489 @@
                                 $this->dbh = null;
 
-                                /* It's possible ext/mysqli is misconfigured. Fall back to ext/mysql if:
+                                /*
+                                 * It's possible ext/mysqli is misconfigured. Fall back to ext/mysql if:
                                  *  - We haven't previously connected, and
                                  *  - WP_USE_EXT_MYSQL isn't set to false, and
@@ -1568 +1568 @@
 
                 return false;
+        }
+
+        /**
+         * Parse the DB_HOST setting to interpret it for mysqli_real_connect.
+         *
+         * mysqli_real_connect doesn't support the host param including a port or
+         * socket like mysql_connect does. This duplicates how mysql_connect detects
+         * a port and/or socket file.
+         *
+         * @since 4.9.0
+         *
+         * @param string $host The DB_HOST setting to parse.
+         * @return array|bool Array containing the host, the port, the socket and whether
+         *                    it is an IPv6 address, in that order. If $host couldn't be parsed,
+         *                    returns false.
+         */
+        public function parse_db_host( $host ) {
+                $port    = null;
+                $socket  = null;
+                $is_ipv6 = false;
+
+                // We need to check for an IPv6 address first.
+                // An IPv6 address will always contain at least two colons.
+                if ( substr_count( $host, ':' ) > 1 ) {
+                        $pattern = '#^(?:\[)?(?<host>[0-9a-fA-F:]+)(?:\]:(?<port>[\d]+))?(?:/(?<socket>.+))?#';
+                        $is_ipv6 = true;
+                } else {
+                        // We seem to be dealing with an IPv4 address.
+                        $pattern = '#^(?<host>[^:/]*)(?::(?<port>[\d]+))?(?::(?<socket>.+))?#';
+                }
+
+                $matches = array();
+                $result = preg_match( $pattern, $host, $matches );
+
+                if ( 1 !== $result ) {
+                        // Couldn't parse the address, bail.
+                        return false;
+                }
+
+                foreach ( array( 'host', 'port', 'socket' ) as $component ) {
+                        if ( array_key_exists( $component, $matches ) ) {
+                                $$component = $matches[$component];
+                        }
+                }
+
+                return array( $host, $port, $socket, $is_ipv6 );
         }