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<div class="section" id="server-location-interface-locate">
<h1>Server location interface (locate)<a class="headerlink" href="#server-location-interface-locate" title="Permalink to this headline">¶</a></h1>
<p>The locate interface allows modules to control how KDCs and similar
services are located by clients. For a detailed description of the
ccselect interface, see the header file <code class="docutils literal"><span class="pre"><krb5/locate_plugin.h></span></code>.</p>
<p>A locate module exports a structure object of type
krb5plugin_service_locate_ftable, with the name <code class="docutils literal"><span class="pre">service_locator</span></code>.
The structure contains a minor version and pointers to the module’s
methods.</p>
<p>The primary locate method is <strong>lookup</strong>, which accepts a service type,
realm name, desired socket type, and desired address family (which
will be AF_UNSPEC if no specific address family is desired). The
method should invoke the callback function once for each server
address it wants to return, passing a socket type (SOCK_STREAM for TCP
or SOCK_DGRAM for UDP) and socket address. The <strong>lookup</strong> method
should return 0 if it has authoritatively determined the server
addresses for the realm, KRB5_PLUGIN_NO_HANDLE if it wants to let
other location mechanisms determine the server addresses, or another
code if it experienced a failure which should abort the location
process.</p>
<p>A module can create and destroy per-library-context state objects by
implementing the <strong>init</strong> and <strong>fini</strong> methods. State objects have
the type void *, and should be cast to an internal type for the state
object.</p>
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