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+.. _profile_plugin:
+
+Configuration interface (profile)
+=================================
+
+The profile interface allows a module to control how krb5
+configuration information is obtained by the Kerberos library and
+applications.  For a detailed description of the profile interface,
+see the header file ``<profile.h>``.
+
+.. note::
+
+          The profile interface does not follow the normal conventions
+          for MIT krb5 pluggable interfaces, because it is part of a
+          lower-level component of the krb5 library.
+
+As with other types of plugin modules, a profile module is a Unix
+shared object or Windows DLL, built separately from the krb5 tree.
+The krb5 library will dynamically load and use a profile plugin module
+if it reads a ``module`` directive at the beginning of krb5.conf, as
+described in :ref:`profile_plugin_config`.
+
+A profile module exports a function named ``profile_module_init``
+matching the signature of the profile_module_init_fn type.  This
+function accepts a residual string, which may be used to help locate
+the configuration source.  The function fills in a vtable and may also
+create a per-profile state object.  If the module uses state objects,
+it should implement the **copy** and **cleanup** methods to manage
+them.
+
+A basic read-only profile module need only implement the
+**get_values** and **free_values** methods.  The **get_values** method
+accepts a null-terminated list of C string names (e.g., an array
+containing "libdefaults", "clockskew", and NULL for the **clockskew**
+variable in the :ref:`libdefaults` section) and returns a
+null-terminated list of values, which will be cleaned up with the
+**free_values** method when the caller is done with them.
+
+Iterable profile modules must also define the **iterator_create**,
+**iterator**, **iterator_free**, and **free_string** methods.  The
+core krb5 code does not require profiles to be iterable, but some
+applications may iterate over the krb5 profile object in order to
+present configuration interfaces.
+
+Writable profile modules must also define the **writable**,
+**modified**, **update_relation**, **rename_section**,
+**add_relation**, and **flush** methods.  The core krb5 code does not
+require profiles to be writable, but some applications may write to
+the krb5 profile in order to present configuration interfaces.
+
+The following is an example of a very basic read-only profile module
+which returns a hardcoded value for the **default_realm** variable in
+:ref:`libdefaults`, and provides no other configuration information.
+(For conciseness, the example omits code for checking the return
+values of malloc and strdup.) ::
+
+    #include <stdlib.h>
+    #include <string.h>
+    #include <profile.h>
+
+    static long
+    get_values(void *cbdata, const char *const *names, char ***values)
+    {
+        if (names[0] != NULL && strcmp(names[0], "libdefaults") == 0 &&
+            names[1] != NULL && strcmp(names[1], "default_realm") == 0) {
+            *values = malloc(2 * sizeof(char *));
+            (*values)[0] = strdup("ATHENA.MIT.EDU");
+            (*values)[1] = NULL;
+            return 0;
+        }
+        return PROF_NO_RELATION;
+    }
+
+    static void
+    free_values(void *cbdata, char **values)
+    {
+        char **v;
+
+        for (v = values; *v; v++)
+            free(*v);
+        free(values);
+    }
+
+    long
+    profile_module_init(const char *residual, struct profile_vtable *vtable,
+                        void **cb_ret);
+
+    long
+    profile_module_init(const char *residual, struct profile_vtable *vtable,
+                        void **cb_ret)
+    {
+        *cb_ret = NULL;
+        vtable->get_values = get_values;
+        vtable->free_values = free_values;
+        return 0;
+    }