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Do not search charset in mysql_real_connect if already set #3249

Merged
merged 9 commits into from
Jan 20, 2021
Merged

Do not search charset in mysql_real_connect if already set #3249

merged 9 commits into from
Jan 20, 2021

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renecannao
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In mysql_init() charset is set to NULL .
In mysql_read_connect() charset is not changed if already set

This allows proxysql to change it outside the library

@renecannao
Do not search charset in mysql_real_connect if already set
1ecb00f 
In mysql_init() charset is set to NULL .
In mysql_read_connect() charset is not changed if already set

This allows proxysql to change it outside the library
@renecannao
Do ot use charset_name if not available in SQL3_Free_Connections()
c27ac75 
This fix a crashing bug
@renecannao
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retest this please

JavierJF and others added 3 commits January 15, 2021 16:24
@JavierJF
Fixed undefined behavior in 'test_ps_large_result-t.cpp-t' due non-vo…
d29cb96 
…id non returning functions
@renecannao
Correct typo latin1_german1_ci in libmariadbclient
7044aca 
Collation latin1_german1_ci was incorrectly named latin1_german_ci in libmariadbclient .
This seems to be fixed in version 3.1 but not in 3.0 .
Do not port this commit to proxysql 2.1 because it already uses libmariadbclient 3.1
@renecannao
Do not search charset in mysql_change_user if already set
21d0c8e 
This is an extension of commit 1ecb00f about mysql_real_connect

It also changes mysql_optionsv() for MYSQL_SET_CHARSET_NAME
@renecannao
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We are facing few challenges with this PR.
It seems that:

  • if during mysql_real_connect() the backend cannot set the collation asked by the client (for example if the client is mysql 8 asking for utf8mb4_0900_ai_ci while the backend is mysql 5.7 and doesn't support utf8mb4_0900_ai_ci), the backend silently sets it to its own default
  • if during mysql_change_user() the backend cannot set the collation asked by the client, it returns error Access denied and also (using password: NO)
    This seems a MySQL server bug (inconsistency between connect and change user)

@renecannao
When calling mysql_change_user set collation to default for the given…
78d3830 
… charset if collation ID is greater or equal than 255 (utf8mb4_0900_ai_ci)

We call mysql_options with MYSQL_SET_CHARSET_NAME if collation ID >= 255 .
This to solve the problem of MySQL server returning an Access denied if the backend doesn't support a collation during mysql_change_user
@renecannao
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Relevant MySQL bugs:
http://bugs.mysql.com/102265
http://bugs.mysql.com/102266

@renecannao renecannao merged commit 6431061 into v2.0.16 Jan 20, 2021
@renecannao renecannao mentioned this pull request Jan 26, 2021
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@renecannao renecannao mentioned this pull request Feb 3, 2021
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2 participants
@renecannao @JavierJF