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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Interface to the classic MySQL extension
 *
 * @package    PhpMyAdmin-DBI
 * @subpackage MySQL
 */
if (! defined('PHPMYADMIN')) {
    exit;
}

require_once './libraries/logging.lib.php';

/**
 * MySQL client API
 */
if (! defined('PMA_MYSQL_CLIENT_API')) {
    $client_api = explode('.', mysql_get_client_info());
    define(
        'PMA_MYSQL_CLIENT_API',
        (int)sprintf(
            '%d%02d%02d',
            $client_api[0], $client_api[1], intval($client_api[2])
        )
    );
    unset($client_api);
}

/**
 * Helper function for connecting to the database server
 *
 * @param array  $server       host/port/socket
 * @param string $user         mysql user name
 * @param string $password     mysql user password
 * @param int    $client_flags client flags of connection
 * @param bool   $persistent   whether to use peristent connection
 *
 * @return mixed   false on error or a mysql connection resource on success
 */
function PMA_DBI_real_connect($server, $user, $password, $client_flags,
    $persistent = false
) {
    global $cfg;

    if (empty($client_flags)) {
        if ($cfg['PersistentConnections'] || $persistent) {
            $link = @mysql_pconnect($server, $user, $password);
        } else {
            $link = @mysql_connect($server, $user, $password);
        }
    } else {
        if ($cfg['PersistentConnections'] || $persistent) {
            $link = @mysql_pconnect($server, $user, $password, $client_flags);
        } else {
            $link = @mysql_connect($server, $user, $password, false, $client_flags);
        }
    }

    return $link;
}

/**
 * Run the multi query and output the results
 *
 * @param mysqli $link  mysqli object
 * @param string $query multi query statement to execute
 *
 * @return boolean false always false since mysql extention not support
 *                       for multi query executions
 */
function PMA_DBI_real_multi_query($link, $query)
{
    // N.B.: PHP's 'mysql' extension does not support
    // multi_queries so this function will always
    // return false. Use the 'mysqli' extension, if
    // you need support for multi_queries.
    return false;
}

/**
 * connects to the database server
 *
 * @param string $user                 mysql user name
 * @param string $password             mysql user password
 * @param bool   $is_controluser       whether this is a control user connection
 * @param array  $server               host/port/socket/persistent
 * @param bool   $auxiliary_connection (when true, don't go back to login if
 *                                     connection fails)
 *
 * @return mixed false on error or a mysqli object on success
 */
function PMA_DBI_connect(
    $user, $password, $is_controluser = false, $server = null,
    $auxiliary_connection = false
) {
    global $cfg;

    if ($server) {
        $server_port = (empty($server['port']))
            ? ''
            : ':' . (int)$server['port'];
        $server_socket = (empty($server['socket']))
            ? ''
            : ':' . $server['socket'];
    } else {
        $server_port   = (empty($cfg['Server']['port']))
            ? ''
            : ':' . (int)$cfg['Server']['port'];
        $server_socket = (empty($cfg['Server']['socket']))
            ? ''
            : ':' . $cfg['Server']['socket'];
    }

    $client_flags = 0;

    // always use CLIENT_LOCAL_FILES as defined in mysql_com.h
    // for the case where the client library was not compiled
    // with --enable-local-infile
    $client_flags |= 128;

    /* Optionally compress connection */
    if (defined('MYSQL_CLIENT_COMPRESS') && $cfg['Server']['compress']) {
        $client_flags |= MYSQL_CLIENT_COMPRESS;
    }

    /* Optionally enable SSL */
    if (defined('MYSQL_CLIENT_SSL') && $cfg['Server']['ssl']) {
        $client_flags |= MYSQL_CLIENT_SSL;
    }

    if (!$server) {
        $link = PMA_DBI_real_connect(
            $cfg['Server']['host'] . $server_port . $server_socket,
            $user, $password, empty($client_flags) ? null : $client_flags
        );

        // Retry with empty password if we're allowed to
        if (empty($link) && $cfg['Server']['nopassword'] && !$is_controluser) {
            $link = PMA_DBI_real_connect(
                $cfg['Server']['host'] . $server_port . $server_socket,
                $user, '', empty($client_flags) ? null : $client_flags
            );
        }
    } else {
        if (!isset($server['host'])) {
            $link = PMA_DBI_real_connect($server_socket, $user, $password, null);
        } else {
            $link = PMA_DBI_real_connect(
                $server['host'] . $server_port . $server_socket,
                $user, $password, null
            );
        }
    }
    if (empty($link)) {
        if ($is_controluser) {
            trigger_error(
                __(
                    'Connection for controluser as defined'
                    . ' in your configuration failed.'
                ),
                E_USER_WARNING
            );
            return false;
        }
        // we could be calling PMA_DBI_connect() to connect to another
        // server, for example in the Synchronize feature, so do not
        // go back to main login if it fails
        if (! $auxiliary_connection) {
            PMA_log_user($user, 'mysql-denied');
            global $auth_plugin;
            $auth_plugin->authFails();
        } else {
            return false;
        }
    } // end if
    if (! $server) {
        PMA_DBI_postConnect($link, $is_controluser);
    }
    return $link;
}

/**
 * selects given database
 *
 * @param string   $dbname name of db to select
 * @param resource $link   mysql link resource
 *
 * @return bool
 */
function PMA_DBI_select_db($dbname, $link = null)
{
    if (empty($link)) {
        if (isset($GLOBALS['userlink'])) {
            $link = $GLOBALS['userlink'];
        } else {
            return false;
        }
    }
    return mysql_select_db($dbname, $link);
}

/**
 * runs a query and returns the result
 *
 * @param string   $query   query to run
 * @param resource $link    mysql link resource
 * @param int      $options query options
 *
 * @return mixed
 */
function PMA_DBI_real_query($query, $link, $options)
{
    if ($options == ($options | PMA_DBI_QUERY_STORE)) {
        return mysql_query($query, $link);
    } elseif ($options == ($options | PMA_DBI_QUERY_UNBUFFERED)) {
        return mysql_unbuffered_query($query, $link);
    } else {
        return mysql_query($query, $link);
    }
}

/**
 * returns array of rows with associative and numeric keys from $result
 *
 * @param resource $result result  MySQL result
 *
 * @return array
 */
function PMA_DBI_fetch_array($result)
{
    return mysql_fetch_array($result, MYSQL_BOTH);
}

/**
 * returns array of rows with associative keys from $result
 *
 * @param resource $result MySQL result
 *
 * @return array
 */
function PMA_DBI_fetch_assoc($result)
{
    return mysql_fetch_array($result, MYSQL_ASSOC);
}

/**
 * returns array of rows with numeric keys from $result
 *
 * @param resource $result MySQL result
 *
 * @return array
 */
function PMA_DBI_fetch_row($result)
{
    return mysql_fetch_array($result, MYSQL_NUM);
}

/**
 * Adjusts the result pointer to an arbitrary row in the result
 *
 * @param resource $result database result
 * @param integer  $offset offset to seek
 *
 * @return bool true on success, false on failure
 */
function PMA_DBI_data_seek($result, $offset)
{
    return mysql_data_seek($result, $offset);
}

/**
 * Frees memory associated with the result
 *
 * @param resource $result database result
 *
 * @return void
 */
function PMA_DBI_free_result($result)
{
    if (is_resource($result) && get_resource_type($result) === 'mysql result') {
        mysql_free_result($result);
    }
}

/**
 * Check if there are any more query results from a multi query
 *
 * @return bool false
 */
function PMA_DBI_more_results()
{
    // N.B.: PHP's 'mysql' extension does not support
    // multi_queries so this function will always
    // return false. Use the 'mysqli' extension, if
    // you need support for multi_queries.
    return false;
}

/**
 * Prepare next result from multi_query
 *
 * @return boo false
 */
function PMA_DBI_next_result()
{
    // N.B.: PHP's 'mysql' extension does not support
    // multi_queries so this function will always
    // return false. Use the 'mysqli' extension, if
    // you need support for multi_queries.
    return false;
}

/**
 * Returns a string representing the type of connection used
 *
 * @param resource $link mysql link
 *
 * @return string type of connection used
 */
function PMA_DBI_get_host_info($link = null)
{
    if (null === $link) {
        if (isset($GLOBALS['userlink'])) {
            $link = $GLOBALS['userlink'];
        } else {
            return false;
        }
    }
    return mysql_get_host_info($link);
}

/**
 * Returns the version of the MySQL protocol used
 *
 * @param resource $link mysql link
 *
 * @return int version of the MySQL protocol used
 */
function PMA_DBI_get_proto_info($link = null)
{
    if (null === $link) {
        if (isset($GLOBALS['userlink'])) {
            $link = $GLOBALS['userlink'];
        } else {
            return false;
        }
    }
    return mysql_get_proto_info($link);
}

/**
 * returns a string that represents the client library version
 *
 * @return string MySQL client library version
 */
function PMA_DBI_get_client_info()
{
    return mysql_get_client_info();
}

/**
 * returns last error message or false if no errors occured
 *
 * @param resource $link mysql link
 *
 * @return string|bool $error or false
 */
function PMA_DBI_getError($link = null)
{
    $GLOBALS['errno'] = 0;

    /* Treat false same as null because of controllink */
    if ($link === false) {
        $link = null;
    }

    if (null === $link && isset($GLOBALS['userlink'])) {
        $link =& $GLOBALS['userlink'];

        // Do not stop now. On the initial connection, we don't have a $link,
        // we don't have a $GLOBALS['userlink'], but we can catch the error code
        //    } else {
        //            return false;
    }

    if (null !== $link && false !== $link) {
        $error_number = mysql_errno($link);
        $error_message = mysql_error($link);
    } else {
        $error_number = mysql_errno();
        $error_message = mysql_error();
    }
    if (0 == $error_number) {
        return false;
    }

    // keep the error number for further check after the call to PMA_DBI_getError()
    $GLOBALS['errno'] = $error_number;

    return PMA_DBI_formatError($error_number, $error_message);
}

/**
 * returns the number of rows returned by last query
 *
 * @param resource $result MySQL result
 *
 * @return string|int
 */
function PMA_DBI_num_rows($result)
{
    if (!is_bool($result)) {
        return mysql_num_rows($result);
    } else {
        return 0;
    }
}

/**
 * returns last inserted auto_increment id for given $link or $GLOBALS['userlink']
 *
 * @param resource $link the mysql object
 *
 * @return string|int
 */
function PMA_DBI_insert_id($link = null)
{
    if (empty($link)) {
        if (isset($GLOBALS['userlink'])) {
            $link = $GLOBALS['userlink'];
        } else {
            return false;
        }
    }
    // If the primary key is BIGINT we get an incorrect result
    // (sometimes negative, sometimes positive)
    // and in the present function we don't know if the PK is BIGINT
    // so better play safe and use LAST_INSERT_ID()
    //
    return PMA_DBI_fetch_value('SELECT LAST_INSERT_ID();', 0, 0, $link);
}

/**
 * returns the number of rows affected by last query
 *
 * @param resource $link           the mysql object
 * @param bool     $get_from_cache whether to retrieve from cache
 *
 * @return string|int
 */
function PMA_DBI_affected_rows($link = null, $get_from_cache = true)
{
    if (empty($link)) {
        if (isset($GLOBALS['userlink'])) {
            $link = $GLOBALS['userlink'];
        } else {
            return false;
        }
    }

    if ($get_from_cache) {
        return $GLOBALS['cached_affected_rows'];
    } else {
        return mysql_affected_rows($link);
    }
}

/**
 * returns metainfo for fields in $result
 *
 * @param resource $result MySQL result
 *
 * @return array meta info for fields in $result
 *
 * @todo add missing keys like in mysqli_query (decimals)
 */
function PMA_DBI_get_fields_meta($result)
{
    $fields       = array();
    $num_fields   = mysql_num_fields($result);
    for ($i = 0; $i < $num_fields; $i++) {
        $field = mysql_fetch_field($result, $i);
        $field->flags = mysql_field_flags($result, $i);
        $field->orgtable = mysql_field_table($result, $i);
        $field->orgname = mysql_field_name($result, $i);
        $fields[] = $field;
    }
    return $fields;
}

/**
 * return number of fields in given $result
 *
 * @param resource $result MySQL result
 *
 * @return int  field count
 */
function PMA_DBI_num_fields($result)
{
    return mysql_num_fields($result);
}

/**
 * returns the length of the given field $i in $result
 *
 * @param resource $result MySQL result
 * @param int      $i      field
 *
 * @return int length of field
 */
function PMA_DBI_field_len($result, $i)
{
    return mysql_field_len($result, $i);
}

/**
 * returns name of $i. field in $result
 *
 * @param resource $result MySQL result
 * @param int      $i      field
 *
 * @return string name of $i. field in $result
 */
function PMA_DBI_field_name($result, $i)
{
    return mysql_field_name($result, $i);
}

/**
 * returns concatenated string of human readable field flags
 *
 * @param resource $result MySQL result
 * @param int      $i      field
 *
 * @return string field flags
 */
function PMA_DBI_field_flags($result, $i)
{
    return mysql_field_flags($result, $i);
}

/**
 * Store the result returned from multi query
 *
 * @return false
 */
function PMA_DBI_store_result()
{
    return false;
}
?>

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