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