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<?php
/*
** Zabbix
** Copyright (C) 2001-2023 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
/**
* Database backend class for MySQL.
*/
class MysqlDbBackend extends DbBackend {
/**
* Check if 'dbversion' table exists.
*
* @return bool
*/
protected function checkDbVersionTable() {
$table_exists = DBfetch(DBselect("SHOW TABLES LIKE 'dbversion'"));
if (!$table_exists) {
$this->setError(_s('Unable to determine current Zabbix database version: %1$s.',
_s('the table "%1$s" was not found', 'dbversion')
));
return false;
}
return true;
}
/**
* Check database and table fields encoding.
*
* @return bool
*/
public function checkEncoding() {
global $DB;
return $this->checkDatabaseEncoding($DB) && $this->checkTablesEncoding($DB);
}
/**
* Check database schema encoding. On error will set warning message.
*
* @param array $DB Array of database settings, same as global $DB.
*
* @return bool
*/
protected function checkDatabaseEncoding(array $DB) {
$row = DBfetch(DBselect('SELECT default_character_set_name db_charset FROM information_schema.schemata'.
' WHERE schema_name='.zbx_dbstr($DB['DATABASE'])
));
if ($row && !in_array(strtoupper($row['db_charset']), ZBX_DB_MYSQL_ALLOWED_CHARSETS)) {
$this->setWarning(_s('Incorrect default charset for Zabbix database: %1$s.',
_s('"%1$s" instead "%2$s"', $row['db_charset'], implode(', ', ZBX_DB_MYSQL_ALLOWED_CHARSETS))
));
return false;
}
return true;
}
/**
* Check tables schema encoding. On error will set warning message.
*
* @param array $DB Array of database settings, same as global $DB.
*
* @return bool
*/
protected function checkTablesEncoding(array $DB) {
// Aliasing table_name to ensure field name is lowercase.
$tables = DBfetchColumn(DBSelect('SELECT table_name AS table_name FROM information_schema.columns'.
' WHERE table_schema='.zbx_dbstr($DB['DATABASE']).
' AND '.dbConditionString('table_name', array_keys(DB::getSchema())).
' AND '.dbConditionString('data_type', ['text', 'varchar', 'longtext']).
' AND ('.
dbConditionString('UPPER(character_set_name)', ZBX_DB_MYSQL_ALLOWED_CHARSETS, true).
' OR '.dbConditionString('collation_name', ZBX_DB_MYSQL_ALLOWED_COLLATIONS, true).
')'
), 'table_name');
if ($tables) {
$tables = array_unique($tables);
$this->setWarning(_n('Unsupported charset or collation for table: %1$s.',
'Unsupported charset or collation for tables: %1$s.',
implode(', ', $tables), implode(', ', $tables), count($tables)
));
return false;
}
return true;
}
/**
* Check is current connection contain requested cipher list.
*
* @return bool
*/
public function isConnectionSecure() {
$row = DBfetch(DBselect("SHOW STATUS LIKE 'ssl_cipher'"));
if (!$row || !$row['Value']) {
$this->setError('Error connecting to database. Empty cipher.');
return false;
}
return true;
}
/**
* Create connection to database server.
*
* @param string $host Host name.
* @param string $port Port.
* @param string $user User name.
* @param string $password Password.
* @param string $dbname Database name.
* @param string $schema DB schema.
*
* @return mysqli|null
*/
public function connect($host, $port, $user, $password, $dbname, $schema): ?mysqli {
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$resource = mysqli_init();
if ($resource === false) {
return null;
}
if ($this->tls_encryption) {
$cipher_suit = $this->tls_cipher_list !== '' ? $this->tls_cipher_list : null;
$resource->ssl_set($this->tls_key_file, $this->tls_cert_file, $this->tls_ca_file, null, $cipher_suit);
$tls_mode = MYSQLI_CLIENT_SSL;
}
else {
$tls_mode = 0;
}
try {
@$resource->real_connect($host, $user, $password, $dbname, $port, null, $tls_mode);
}
catch (mysqli_sql_exception $e) {
$this->setError($e->getMessage());
return null;
}
if ($resource->autocommit(true) === false) {
$this->setError('Error setting auto commit.');
return null;
}
return $resource;
}
/**
* Initialize connection.
*
* @return bool
*/
public function init() {
$db_encoding = DBselect('SHOW VARIABLES LIKE "character_set_database"');
$charset = $db_encoding ? DBfetch($db_encoding) : false;
if ($charset && strtoupper($charset['Value']) === 'UTF8MB4') {
DBexecute('SET NAMES utf8mb4');
return;
}
DBexecute('SET NAMES utf8');
}
}