The Ultimate Guide to High Availability with MariaDB

MariaDB Connector/C 3.4.0 Release Notes

The most recent Stable (GA) release of MariaDB Connector/C is:
MariaDB Connector/C 3.4.1

Release Notes Changelog About MariaDB Connector/C

Release date: 24 June 2022

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

For a description of this library see the MariaDB Connector/C page.

Notable changes

TLS encryption

CONC-692: Provide X509 peer certificate information:

Added a new structure MARIADB_X509_INFO, which contains information about peer certificate. The information can be obtained via mysql_get_infov API function:

MARIADB_X509_INFO *info;
mariadb_get_infov(mysql, MARIADB_TLS_PEER_CERT_INFO, &info);

MDEV-31857: enable MYSQL_OPT_SSL_VERIFY_SERVER_CERT by default

Using TLS/SSL has been simplified with MariaDB Server 11.4. Before version 11.4, proper TLS/SSL configuration required multiple manual steps for the server and all the clients connecting to it.

For MariaDB Connector/C before 3.4 to establish an TLS/SSL encrypted connection, or a MariaDB Server release series previous to 11.4, three options can be used:

MDEV-30366 - Server now permits to send a result-set containing generated id and affected rows for each bulk operation. This feature can be enabled with option MARIADB_OPT_BULK_UNIT_RESULTS. The server indicates if this feature is supported by setting MARIADB_CLIENT_BULK_UNIT_RESULTS in his capability flags.

  • Added support for restricted_auth in configuration files
  • Support for new collations which were added in MariaDB Server 11.5

Issues fixed

CONC-605: Don't allow to use unsupported client flags in mysql_real_connect CONC-677: Fix memory leak when setting default configuration directories CONC-648: Don't trust error packets received prior to TLS handshake completion. (Kudos to Daniel Lenski for his contribution CONC-683: Check pending results when closing statement CONC-688: mariadb_rpl_fetch() crashes if table is partitioned

Contributions

  • Warning fixes (-Wcalloc-transposed-args) in calloc calls (Thanks to Sam James)
  • Fixed SSL_read/write return value check in ma_tls_async_check_result (Thanks to Josh Hunt)

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the changelog.

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