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><A
NAME="LIBPQ-LDAP"
>29.15. LDAP Lookup of Connection Parameters</A
></H1
><A
NAME="AEN28939"
></A
><P
>If <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> has been compiled with LDAP support (option
<TT
CLASS="LITERAL"
><TT
CLASS="OPTION"
>--with-ldap</TT
></TT
> for <TT
CLASS="COMMAND"
>configure</TT
>)
it is possible to retrieve connection options like <TT
CLASS="LITERAL"
>host</TT
>
or <TT
CLASS="LITERAL"
>dbname</TT
> via LDAP from a central server.
The advantage is that if the connection parameters for a database change,
the connection information doesn't have to be updated on all client machines.</P
><P
>LDAP connection parameter lookup uses the connection service file
<TT
CLASS="FILENAME"
>pg_service.conf</TT
> (see <A
HREF="libpq-pgservice.html"
>Section 29.14</A
>).
A line in a <TT
CLASS="FILENAME"
>pg_service.conf</TT
> stanza that starts with
<TT
CLASS="LITERAL"
>ldap://</TT
> will be recognized as an LDAP URL and an LDAP
query will be performed. The result must be a list of <TT
CLASS="LITERAL"
>keyword =
value</TT
> pairs which will be used to set connection options.
The URL must conform to RFC 1959 and be of the form
</P><PRE
CLASS="SYNOPSIS"
>ldap://[<TT
CLASS="REPLACEABLE"
><I
>hostname</I
></TT
>[:<TT
CLASS="REPLACEABLE"
><I
>port</I
></TT
>]]/<TT
CLASS="REPLACEABLE"
><I
>search_base</I
></TT
>?<TT
CLASS="REPLACEABLE"
><I
>attribute</I
></TT
>?<TT
CLASS="REPLACEABLE"
><I
>search_scope</I
></TT
>?<TT
CLASS="REPLACEABLE"
><I
>filter</I
></TT
></PRE
><P>
where <TT
CLASS="REPLACEABLE"
><I
>hostname</I
></TT
>
defaults to <TT
CLASS="LITERAL"
>localhost</TT
> and
<TT
CLASS="REPLACEABLE"
><I
>port</I
></TT
> defaults to 389.</P
><P
>Processing of <TT
CLASS="FILENAME"
>pg_service.conf</TT
> is terminated after
a successful LDAP lookup, but is continued if the LDAP server cannot be
contacted.  This is to provide a fallback with
further LDAP URL lines that point to different LDAP
servers, classical <TT
CLASS="LITERAL"
>keyword = value</TT
> pairs, or
default connection options.
If you would rather get an error message in this case, add a
syntactically incorrect line after the LDAP URL.</P
><P
>A sample LDAP entry that has been created with the LDIF file
</P><PRE
CLASS="SYNOPSIS"
>version:1
dn:cn=mydatabase,dc=mycompany,dc=com
changetype:add
objectclass:top
objectclass:groupOfUniqueNames
cn:mydatabase
uniqueMember:host=dbserver.mycompany.com
uniqueMember:port=5439
uniqueMember:dbname=mydb
uniqueMember:user=mydb_user
uniqueMember:sslmode=require</PRE
><P>
might be queried with the following LDAP URL:
</P><PRE
CLASS="SYNOPSIS"
>ldap://ldap.mycompany.com/dc=mycompany,dc=com?uniqueMember?one?(cn=mydatabase)</PRE
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