<?php /** * @file dba_driver.php * @brief some database related functions and abstract driver class. * * This file contains the abstract database driver class dba_driver and some * functions for working with databases. */ /** * @brief Returns the database driver object. * * If available it will use PHP's mysqli otherwise mysql driver. * * @param string $server DB server name * @param string $port DB port * @param string $user DB username * @param string $pass DB password * @param string $db database name * @param string $dbtype 0 for mysql, 1 for postgres * @param bool $install Defaults to false * @return null|dba_driver A database driver object (dba_mysql|dba_mysqli) or null if no driver found. */ function dba_factory($server, $port,$user,$pass,$db,$dbtype,$install = false) { $dba = null; $dbtype = intval($dbtype); if($dbtype == DBTYPE_POSTGRES) { require_once('include/dba/dba_postgres.php'); if(is_null($port)) $port = 5432; $dba = new dba_postgres($server, $port, $user, $pass, $db, $install); } else { if(class_exists('mysqli')) { if (is_null($port)) $port = ini_get("mysqli.default_port"); require_once('include/dba/dba_mysqli.php'); $dba = new dba_mysqli($server, $port,$user,$pass,$db,$install); } else { if (is_null($port)) $port = "3306"; require_once('include/dba/dba_mysql.php'); $dba = new dba_mysql($server, $port,$user,$pass,$db,$install); } } define('NULL_DATE', $dba->get_null_date()); define('ACTIVE_DBTYPE', $dbtype); return $dba; } /** * @brief abstract database driver class. * * This class gets extended by the real database driver classes, e.g. dba_mysql, * dba_mysqli. */ abstract class dba_driver { // legacy behavior const INSTALL_SCRIPT='install/schema_mysql.sql'; const NULL_DATE = '0000-00-00 00:00:00'; const UTC_NOW = 'UTC_TIMESTAMP()'; protected $debug = 0; protected $db; public $connected = false; public $error = false; /** * @brief Connect to the database. * * This abstract function needs to be implemented in the real driver. * * @param string $server DB server name * @param string $port DB port * @param string $user DB username * @param string $pass DB password * @param string $db database name * @return bool */ abstract function connect($server, $port, $user, $pass, $db); /** * @brief Perform a DB query with the SQL statement $sql. * * This abstract function needs to be implemented in the real driver. * * @param string $sql The SQL query to execute */ abstract function q($sql); /** * @brief Escape a string before being passed to a DB query. * * This abstract function needs to be implemented in the real driver. * * @param string $str The string to escape. */ abstract function escape($str); /** * @brief Close the database connection. * * This abstract function needs to be implemented in the real driver. */ abstract function close(); /** * @brief Return text name for db driver * * This abstract function needs to be implemented in the real driver. */ abstract function getdriver(); function __construct($server, $port, $user,$pass,$db,$install = false) { if(($install) && (! $this->install($server, $port, $user, $pass, $db))) { return; } $this->connect($server, $port, $user, $pass, $db); } function get_null_date() { return static::NULL_DATE; } function get_install_script() { return static::INSTALL_SCRIPT; } function utcnow() { return static::UTC_NOW; } function install($server,$user,$pass,$db) { if (!(strlen($server) && strlen($user))){ $this->connected = false; $this->db = null; return false; } if(strlen($server) && ($server !== 'localhost') && ($server !== '127.0.0.1')) { if(! dns_get_record($server, DNS_A + DNS_CNAME + DNS_PTR)) { $this->error = sprintf( t('Cannot locate DNS info for database server \'%s\''), $server); $this->connected = false; $this->db = null; return false; } } return true; } /** * @brief Sets the database driver's debugging state. * * @param int $dbg 0 to disable debugging */ function dbg($dbg) { $this->debug = $dbg; } function __destruct() { if($this->db && $this->connected) { $this->close(); } } function quote_interval($txt) { return $txt; } function optimize_table($table) { q('OPTIMIZE TABLE '.$table); } function concat($fld, $sep) { return 'GROUP_CONCAT(DISTINCT '.$fld.' SEPARATOR \''.$sep.'\')'; } function escapebin($str) { return $this->escape($str); } function unescapebin($str) { return $str; } } // end abstract dba_driver class // Procedural functions function printable($s) { $s = preg_replace("~([\x01-\x08\x0E-\x0F\x10-\x1F\x7F-\xFF])~",".", $s); $s = str_replace("\x00",'.',$s); if(x($_SERVER,'SERVER_NAME')) $s = escape_tags($s); return $s; } /** * @brief set database driver debugging state. * * @param int $state 0 to disable debugging */ function dbg($state) { global $db; if($db) $db->dbg($state); } /** * @brief Escape strings being passed to DB queries. * * Always escape strings being used in DB queries. This function returns the * escaped string. Integer DB parameters should all be proven integers by * wrapping with intval(). * * @param string $str A string to pass to a DB query * @return Return an escaped string of the value to pass to a DB query. */ function dbesc($str) { global $db; if($db && $db->connected) return($db->escape($str)); else return(str_replace("'", "\\'", $str)); } function dbescbin($str) { global $db; return $db->escapebin($str); } function dbunescbin($str) { global $db; return $db->unescapebin($str); } function dbescdate($date) { if(ACTIVE_DBTYPE == DBTYPE_POSTGRES && $date == '0000-00-00 00:00:00') { $date = NULL_DATE; } else if(ACTIVE_DBTYPE != DBTYPE_POSTGRES && $date == '0001-01-01 00:00:00') { $date = NULL_DATE; } return $date; } function db_quoteinterval($txt) { global $db; return $db->quote_interval($txt); } function dbesc_identifier($str) { global $db; return $db->escape_identifier($txt); } function db_utcnow() { global $db; return $db->utcnow(); } function db_optimizetable($table) { global $db; $db->optimize_table($table); } function db_concat($fld, $sep) { global $db; return $db->concat($fld, $sep); } // Function: q($sql,$args); // Description: execute SQL query with printf style args. // Example: $r = q("SELECT * FROM `%s` WHERE `uid` = %d", // 'user', 1); /** * @brief Execute a SQL query with printf style args. * * printf style arguments %s and %d are replaced with variable arguments, which * should each be appropriately dbesc() or intval(). * SELECT queries return an array of results or false if SQL or DB error. Other * queries return true if the command was successful or false if it wasn't. * * Example: * $r = q("SELECT * FROM `%s` WHERE `uid` = %d", * 'user', 1); * * @param string $sql The SQL query to execute * @return bool|array */ function q($sql) { global $db; $args = func_get_args(); unset($args[0]); if($db && $db->connected) { $stmt = vsprintf($sql, $args); if($stmt === false) { if(version_compare(PHP_VERSION, '5.4.0') >= 0) logger('dba: vsprintf error: ' . print_r(debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT, 1), true)); else logger('dba: vsprintf error: ' . print_r(debug_backtrace(), true)); } return $db->q($stmt); } /* * This will happen occasionally trying to store the * session data after abnormal program termination */ logger('dba: no database: ' . print_r($args,true)); return false; } /** * @brief Raw DB query, no arguments. * * This function executes a raw DB query without any arguments. * * @param string $sql The SQL query to execute */ function dbq($sql) { global $db; if($db && $db->connected) $ret = $db->q($sql); else $ret = false; return $ret; } // Caller is responsible for ensuring that any integer arguments to // dbesc_array are actually integers and not malformed strings containing // SQL injection vectors. All integer array elements should be specifically // cast to int to avoid trouble. function dbesc_array_cb(&$item, $key) { if(is_string($item)) { if($item == '0000-00-00 00:00:00' && ACTIVE_DBTYPE == DBTYPE_POSTGRES) $item = '0001-01-01 00:00:00'; else if($item == '0001-01-01 00:00:00' && ACTIVE_DBTYPE == DBTYPE_MYSQL) $item = '0000-00-00 00:00:00'; $item = dbesc($item); } } function dbesc_array(&$arr) { if(is_array($arr) && count($arr)) { array_walk($arr,'dbesc_array_cb'); } } function db_getfunc($f) { $lookup = array( 'rand'=>array( DBTYPE_MYSQL=>'RAND()', DBTYPE_POSTGRES=>'RANDOM()' ), 'utc_timestamp'=>array( DBTYPE_MYSQL=>'UTC_TIMESTAMP()', DBTYPE_POSTGRES=>"now() at time zone 'UTC'" ), 'regexp'=>array( DBTYPE_MYSQL=>'REGEXP', DBTYPE_POSTGRES=>'~' ), '^'=>array( DBTYPE_MYSQL=>'^', DBTYPE_POSTGRES=>'#' ) ); $f = strtolower($f); if(isset($lookup[$f]) && isset($lookup[$f][ACTIVE_DBTYPE])) return $lookup[$f][ACTIVE_DBTYPE]; logger('Unable to abstract DB function "'. $f . '" for dbtype ' . ACTIVE_DBTYPE, LOGGER_DEBUG); return $f; }