/**
 * @file bug705.cpp regression case for bug 705 ("Authentication fails when the user connects to a database
 * when the SQL mode includes ANSI_QUOTES")
 *
 * - use only one backend
 * - derectly to backend SET GLOBAL sql_mode="ANSI"
 * - restart MaxScale
 * - check log for "Error : Loading database names for service RW_Split encountered error: Unknown column"
 */

/*
 *  ivan.stoykov@skysql.com 2015-01-26 14:01:11 UTC
 *  When the sql_mode includes ANSI_QUOTES, maxscale fails to execute  the SQL at  LOAD_MYSQL_DATABASE_NAMES
 * string
 *
 *  https://github.com/mariadb-corporation/MaxScale/blob/master/server/core/dbusers.c
 *  line 90:
 #define LOAD_MYSQL_DATABASE_NAMES "SELECT * FROM ( (SELECT COUNT(1) AS ndbs FROM INFORMATION_SCHEMA.SCHEMATA)
 * AS tbl1, (SELECT GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES WHERE privilege_type='SHOW
 * DATABASES' AND REPLACE(GRANTEE, \"\'\",\"\")=CURRENT_USER()) AS tbl2)"
 *
 *  the error log outputs that string:
 *  "Error : Loading database names for service galera_bs_router encountered error: Unknown column ''' in
 * 'where clause'"
 *
 *  I think the quotes in LOAD_MYSQL_DATABASE_NAMES and all the SQL used by MaxScale should be adjusted
 * according to the recent sql_mode at the backend server.
 *
 *  How to repeat:
 *  mysql root@centos-7-minimal:[Mon Jan 26 15:00:48 2015][(none)]> SET SESSION sql_mode = "ORACLE"; select
 * @@sql_mode;
 *  Query OK, 0 rows affected (0.00 sec)
 *
 +----------------------------------------------------------------------------------------------------------------------+
 | @@sql_mode
 |                                                                                                          |
 +----------------------------------------------------------------------------------------------------------------------+
 | PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,ORACLE,NO_KEY_OPTIONS,NO_TABLE_OPTIONS,NO_FIELD_OPTIONS,NO_AUTO_CREATE_USER
 ||
 +----------------------------------------------------------------------------------------------------------------------+
 |  1 row in set (0.00 sec)
 |
 |  mysql root@centos-7-minimal:[Mon Jan 26 15:00:55 2015][(none)]> SELECT
 |@@innodb_version,@@version,@@version_comment, GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES
 |WHERE privilege_type='SHOW DATABASES' AND REPLACE(GRANTEE, "\'","")=CURRENT_USER();
 |  ERROR 1054 (42S22): Unknown column '\'' in 'where clause'
 |  mysql root@centos-7-minimal:[Mon Jan 26 15:00:57 2015][(none)]>
 |  Comment 1 ivan.stoykov@skysql.com 2015-01-26 14:02:42 UTC
 |  Work around: set the sql_mode without ANSI_QUOTES:
 |
 |  mysql root@centos-7-minimal:[Mon Jan 26 15:00:57 2015][(none)]> SET SESSION sql_mode = "MYSQL323"; select
 |@@sql_mode;
 |  Query OK, 0 rows affected (0.00 sec)
 |
 +------------------------------+
 | @@sql_mode                   |
 +------------------------------+
 | MYSQL323,HIGH_NOT_PRECEDENCE |
 +------------------------------+
 |  1 row in set (0.00 sec)
 |
 |  mysql root@centos-7-minimal:[Mon Jan 26 15:01:52 2015][(none)]> SELECT
 |@@innodb_version,@@version,@@version_comment, GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES
 |WHERE privilege_type='SHOW DATABASES' AND REPLACE(GRANTEE, "\'","")=CURRENT_USER();
 +------------------+-----------------------+-----------------------------------+--------------------+----------------+
 | @@innodb_version | @@version             | @@version_comment                 | GRANTEE            |
 |PRIVILEGE_TYPE |
 +------------------+-----------------------+-----------------------------------+--------------------+----------------+
 | 5.6.21-70.0      | 10.0.15-MariaDB-wsrep | MariaDB Server, wsrep_25.10.r4144 | 'root'@'localhost' | SHOW
 |DATABASES |
 +------------------+-----------------------+-----------------------------------+--------------------+----------------+
 |  1 row in set (0.00 sec)
 |  Comment 2 Massimiliano 2015-01-26 14:19:45 UTC
 |  More informations needed for "the recent sql_mode at the backend server"
 |
 |  Is that an issue with a particular mysql/mariadb backend version?
 |  Comment 3 ivan.stoykov@skysql.com 2015-01-26 14:30:08 UTC
 |  No, it is not related to any particular version.
 |
 |  I tested on Percona, MySQL , MariaDB 5.5, MariaDB 10.0.15 with the same result:
 |
 |  [Mon Jan 26 16:24:34 2015][mysql]> SET SESSION sql_mode = ""; SELECT @@sql_mode;
 |  Query OK, 0 rows affected (0.00 sec)
 |
 +------------+
 | @@sql_mode |
 +------------+
 |            |
 +------------+
 |  1 row in set (0.00 sec)
 |  [Mon Jan 26 16:24:53 2015][mysql]> SELECT @@innodb_version,@@version,@@version_comment,
 |GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES WHERE privilege_type='SHOW DATABASES' AND
 |REPLACE(GRANTEE, "\'","")=CURRENT_USER();
 +------------------+-----------------+--------------------------------------------------+--------------------+----------------+
 | @@innodb_version | @@version       | @@version_comment                                | GRANTEE
 |           | PRIVILEGE_TYPE |
 +------------------+-----------------+--------------------------------------------------+--------------------+----------------+
 | 5.5.41-37.0      | 5.5.41-37.0-log | Percona Server (GPL), Release 37.0, Revision 727 | 'seik'@'localhost'
 || SHOW DATABASES |
 +------------------+-----------------+--------------------------------------------------+--------------------+----------------+
 |  1 row in set (0.00 sec)
 |
 |  [Mon Jan 26 16:24:57 2015][mysql]> SET SESSION sql_mode = "DB2";SELECT @@sql_mode;
 |  Query OK, 0 rows affected (0.00 sec)
 |
 +-----------------------------------------------------------------------------------------------+
 | @@sql_mode                                                                                    |
 +-----------------------------------------------------------------------------------------------+
 | PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,DB2,NO_KEY_OPTIONS,NO_TABLE_OPTIONS,NO_FIELD_OPTIONS |
 +-----------------------------------------------------------------------------------------------+
 |  1 row in set (0.00 sec)
 |
 |  :[Mon Jan 26 16:26:19 2015][mysql]> SELECT @@innodb_version,@@version,@@version_comment,
 |GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES WHERE privilege_type='SHOW DATABASES' AND
 |REPLACE(GRANTEE, "\'","")=CURRENT_USER();
 |  ERROR 1054 (42S22): Unknown column '\'' in 'where clause'
 |
 |  mysql root@centos-7-minimal:[Mon Jan 26 14:27:33 2015][(none)]> SET SESSION sql_mode = "POSTGRESQL";
 |select @@sql_mode;
 |
 |
 |
 |
 |
 |                                                                                                       Query
 |OK, 0 rows affected (0.00 sec)
 |
 +------------------------------------------------------------------------------------------------------+
 | @@sql_mode                                                                                           |
 +------------------------------------------------------------------------------------------------------+
 | PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,POSTGRESQL,NO_KEY_OPTIONS,NO_TABLE_OPTIONS,NO_FIELD_OPTIONS |
 +------------------------------------------------------------------------------------------------------+
 |  1 row in set (0.01 sec)
 |
 |  mysql root@centos-7-minimal:[Mon Jan 26 14:42:23 2015][(none)]> SELECT
 |@@innodb_version,@@version,@@version_comment, GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES
 |WHERE privilege_type='SHOW DATABASES' AND REPLACE(GRANTEE, "\'","")=CURRENT_USER();
 |  ERROR 1054 (42S22): Unknown column '\'' in 'where clause'
 |  mysql root@centos-7-minimal:[Mon Jan 26 14:58:57 2015][(none)]>  SET SESSION sql_mode = ""; select
 |@@sql_mode;
 |  Query OK, 0 rows affected (0.00 sec)
 |
 +------------+
 | @@sql_mode |
 +------------+
 |            |
 +------------+
 |  1 row in set (0.00 sec)
 |
 |  mysql root@centos-7-minimal:[Mon Jan 26 14:59:03 2015][(none)]> SELECT
 |@@innodb_version,@@version,@@version_comment, GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES
 |WHERE privilege_type='SHOW DATABASES' AND REPLACE(GRANTEE, "\'","")=CURRENT_USER();
 +------------------+-----------+------------------------------+--------------------+----------------+
 | @@innodb_version | @@version | @@version_comment            | GRANTEE            | PRIVILEGE_TYPE |
 +------------------+-----------+------------------------------+--------------------+----------------+
 | 5.6.22           | 5.6.22    | MySQL Community Server (GPL) | 'root'@'localhost' | SHOW DATABASES |
 +------------------+-----------+------------------------------+--------------------+----------------+
 |  1 row in set (0.00 sec)
 |
 |  mysql root@istoykov.skysql.com:[Mon Jan 26 15:28:12 2015][(none)]> SET SESSION sql_mode = "DB2"; SELECT
 |@@sql_mode;
 |  Query OK, 0 rows affected (0.00 sec)
 |
 +-----------------------------------------------------------------------------------------------+
 | @@sql_mode                                                                                    |
 +-----------------------------------------------------------------------------------------------+
 | PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,DB2,NO_KEY_OPTIONS,NO_TABLE_OPTIONS,NO_FIELD_OPTIONS |
 +-----------------------------------------------------------------------------------------------+
 |  1 row in set (0.00 sec)
 |
 |  mysql root@istoykov.skysql.com:[Mon Jan 26 15:28:19 2015][(none)]> SELECT
 |@@innodb_version,@@version,@@version_comment, GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES
 |WHERE privilege_type='SHOW DATABASES' AND REPLACE(GRANTEE, "\'","")=CURRENT_USER();
 |  ERROR 1054 (42S22): Unknown column '\'' in 'where clause'
 |  mysql root@istoykov.skysql.com:[Mon Jan 26 15:28:32 2015][(none)]> SET SESSION sql_mode = "MYSQL40";
 | SELECT @@sql_mode;
 |  Query OK, 0 rows affected (0.00 sec)
 |
 +-----------------------------+
 | @@sql_mode                  |
 +-----------------------------+
 | MYSQL40,HIGH_NOT_PRECEDENCE |
 +-----------------------------+
 |  1 row in set (0.00 sec)
 |
 |  mysql root@istoykov.skysql.com:[Mon Jan 26 15:29:09 2015][(none)]> SELECT
 |@@innodb_version,@@version,@@version_comment, GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES
 |WHERE privilege_type='SHOW DATABASES' AND REPLACE(GRANTEE, "\'","")=CURRENT_USER();
 +---------------------+--------------------+-------------------+--------------------+----------------+
 | @@innodb_version    | @@version          | @@version_comment | GRANTEE            | PRIVILEGE_TYPE |
 +---------------------+--------------------+-------------------+--------------------+----------------+
 | 5.5.38-MariaDB-35.2 | 5.5.39-MariaDB-log | MariaDB Server    | 'root'@'localhost' | SHOW DATABASES |
 +---------------------+--------------------+-------------------+--------------------+----------------+
 |  1 row in set (0.00 sec)
 |  Comment 4 Massimiliano 2015-01-26 14:48:04 UTC
 |  It's still not clear if the issue is related to MaxScale or it's spotted only when yoy send the statements
 |via mysql client
 |  Comment 5 ivan.stoykov@skysql.com 2015-01-26 16:37:32 UTC
 |  There is at least one case that after setting the sql_mode to string :
 |
 |"REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,ONLY_FULL_GROUP_BY,ANSI,STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
 |at 10.0.15-MariaDB-wsrep-log  , using maxscale in this way returned an error.
 |
 |  $ mysql --host max-scale-host --user=test --password=xxx --port 4449 mysqlslap
 |  ERROR 1045 (28000): Access denied for user 'test'@'IP (using password: YES) to database 'mysqlslap'
 |
 |  error at the maxscale log:
 |  Error : Loading database names for service galera_bs_router encountered error: Unknown column ''' in
 |'where clause'.
 |
 |  the following test was OK:
 |  $ mysql --host max-scale-host --user=test --password=xxx --port 4449
 |
 |  After switch sql_mode to '' as "mysql> set global sql_mode='';",
 |  the connection of the user to a database seems to work OK:
 |  $ mysql --host max-scale-host --user=test --password=xxx -D mysqlslap
 |  Reading table information for completion of table and column names
 |  You can turn off this feature to get a quicker startup with -A
 |
 |  Welcome to the MySQL monitor. Commands end with ; or \g.
 |  Your MySQL connection id is 2532
 |  Server version: 5.5.41-MariaDB MariaDB Server, wsrep_25.10.r4144
 |
 |  Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 |
 |  Oracle is a registered trademark of Oracle Corporation and/or its
 |  affiliates. Other names may be trademarks of their respective
 |  owners.
 |
 |  Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
 |
 |  mysql> Bye
 |
 |
 |  If needed , I will prepare other test case ?
 |  Comment 6 Massimiliano 2015-01-26 16:40:45 UTC
 |  Yes, please provide us other test cases and we will try to reproduce it
 |  Comment 7 Markus Mäkelä 2015-01-26 18:23:25 UTC
 |  Changed the double quotation marks to single quotation marks because the MySQL client manual says that
 |ANSI_QUOTES still accepts single quotes.
 |
 |  This can be verified by first setting sql_mode to ANSI:
 |
 |  set global sql_mode="ANSI";
 |
 |  after that, start MaxScale and the error log contains:
 |
 |  MariaDB Corporation MaxScale    /home/markus/build/log/skygw_err1.log Mon Jan 26 20:16:17 2015
 |  -----------------------------------------------------------------------
 |  --- Logging is enabled.
 |  2015-01-26 20:16:17   Error : Loading database names for service RW Split Router encountered error:
 |Unknown column ''' in 'where clause'.
 |  2015-01-26 20:16:17   Error : Loading database names for service RW Split Hint Router encountered error:
 |Unknown column ''' in 'where clause'.
 |  2015-01-26 20:16:17   Error : Loading database names for service Read Connection Router encountered error:
 |Unknown column ''' in 'where clause'.
 |
 |  After the change the error is gone.
 |  Comment 8 Massimiliano 2015-01-26 21:16:03 UTC
 |  I managed to reproduce it in my environment:
 |
 |  - created a setup with 1 server in a service named "RW_Split"
 |
 |  - issued SET GLOBAL sql_mode="ANSI" via mysql client to that server
 |
 |  - started MaxScale and found an error in the log:
 |
 |
 |  2015-01-26 16:10:52   Error : Loading database names for service RW_Split encountered error: Unknown
 |column ''' in 'where clause'.
 |
 */


#include <iostream>
#include "testconnections.h"
#include "maxadmin_operations.h"

int main(int argc, char* argv[])
{
    TestConnections* Test = new TestConnections(argc, argv);
    Test->set_timeout(20);

    printf("Connecting to backend %s\n", Test->repl->IP[0]);
    fflush(stdout);
    Test->repl->connect();

    Test->tprintf("Sending SET GLOBAL sql_mode=\"ANSI\" to backend %s\n", Test->repl->IP[0]);
    execute_query(Test->repl->nodes[0], "SET GLOBAL sql_mode=\"ANSI\"");

    Test->repl->close_connections();

    Test->tprintf("Restarting MaxScale\n");

    Test->set_timeout(120);
    Test->maxscales->restart_maxscale(0);

    Test->log_excludes(0, "Loading database names");
    Test->log_excludes(0, "Unknown column");

    int rval = Test->global_result;
    delete Test;
    return rval;
    //  }
}