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Adjust libpq docs to be clearer about 'hostaddr' usage by rewording and

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using an itemized list.
This commit is contained in:
Bruce Momjian 2011-02-06 12:04:42 -05:00
parent 97116ca417
commit 5ed45ac09c
1 changed files with 30 additions and 16 deletions
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46
doc/src/sgml/libpq.sgml
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@ -164,22 +164,36 @@ PGconn *PQconnectdbParams(const char **keywords, const char **values, int expand
Using <literal>hostaddr</> instead of <literal>host</> allows the
application to avoid a host name look-up, which might be important
in applications with time constraints. However, a host name is
required for Kerberos, GSSAPI, or SSPI authentication, as well as
for full SSL certificate verification. The following rules are
used:
If <literal>host</> is specified without <literal>hostaddr</>,
a host name lookup occurs.
If <literal>hostaddr</> is specified without <literal>host</>,
the value for <literal>hostaddr</> gives the server network address.
The connection attempt will fail in any of the cases where a
host name is required.
If both <literal>host</> and <literal>hostaddr</> are specified,
the value for <literal>hostaddr</> gives the server network address.
The value for <literal>host</> is ignored unless needed for
authentication or verification purposes, in which case it will be
used as the host name. Note that authentication is likely to fail
if <literal>host</> is not the name of the machine at
<literal>hostaddr</>.
required for Kerberos, GSSAPI, or SSPI authentication
methods, as well as for <literal>verify-full</> SSL
certificate verification. The following rules are used:
<itemizedlist>
<listitem>
<para>
If <literal>host</> is specified without <literal>hostaddr</>,
a host name lookup occurs.
</para>
</listitem>
<listitem>
<para>
If <literal>hostaddr</> is specified without <literal>host</>,
the value for <literal>hostaddr</> gives the server network address.
The connection attempt will fail if the authentication
method requires a host name.
</para>
</listitem>
<listitem>
<para>
If both <literal>host</> and <literal>hostaddr</> are specified,
the value for <literal>hostaddr</> gives the server network address.
The value for <literal>host</> is ignored unless the
authentication method requires it, in which case it will be
used as the host name.
</para>
</listitem>
</itemizedlist>
Note that authentication is likely to fail if <literal>host</>
is not the name of the server at network address <literal>hostaddr</>.
Also, note that <literal>host</> rather than <literal>hostaddr</>
is used to identify the connection in <filename>~/.pgpass</> (see
<xref linkend="libpq-pgpass">).