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Commit 1944cdc98 changed PQhost() to return the hostaddr value when that is specified and host isn't. This is a good idea in general, but fe-auth.c and related files contain PQhost() calls for which it isn't. Specifically, when we compare SSL certificates or other server identity information to the host field, we do not want to use hostaddr instead; that's not what's documented, that's not what happened pre-v10, and it doesn't seem like a good idea. Instead, we can just look at connhost[].host directly. This does what we want in v10 and up; in particular, if neither host nor hostaddr were given, the host field will be replaced with the default host name. That seems useful, and it's likely the reason that these places were coded to call PQhost() originally (since pre-v10, the stored field was not replaced with the default). Back-patch to v10, as 1944cdc98 (just) was. Discussion: https://postgr.es/m/23287.1533227021@sss.pgh.pa.us
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.