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diff --git a/third_party/heimdal/lib/krb5/an2ln_plugin.h b/third_party/heimdal/lib/krb5/an2ln_plugin.h
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+/*
+ * Copyright (c) 2006 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* $Id$ */
+
+#ifndef HEIMDAL_KRB5_AN2LN_PLUGIN_H
+#define HEIMDAL_KRB5_AN2LN_PLUGIN_H 1
+
+#include <heimbase-svc.h>
+
+#define KRB5_PLUGIN_AN2LN "an2ln"
+#define KRB5_PLUGIN_AN2LN_VERSION_0 0
+
+typedef krb5_error_code (KRB5_LIB_CALL *set_result_f)(void *, const char *);
+
+/** @struct krb5plugin_an2ln_ftable_desc
+ *
+ * @brief Description of the krb5_aname_to_lname(3) plugin facility.
+ *
+ * The krb5_aname_to_lname(3) function is pluggable.  The plugin is
+ * named KRB5_PLUGIN_AN2LN ("an2ln"), with a single minor version,
+ * KRB5_PLUGIN_AN2LN_VERSION_0 (0).
+ *
+ * The plugin for krb5_aname_to_lname(3) consists of a data symbol
+ * referencing a structure of type krb5plugin_an2ln_ftable, with four
+ * fields:
+ *
+ * @param init          Plugin initialization function (see krb5-plugin(7))
+ *
+ * @param minor_version The plugin minor version number (0)
+ *
+ * @param fini          Plugin finalization function
+ *
+ * @param an2ln         Plugin aname_to_lname function
+ *
+ * The an2ln field is the plugin entry point that performs the
+ * traditional aname_to_lname operation however the plugin desires.  It
+ * is invoked in no particular order relative to other an2ln plugins,
+ * but it has a 'rule' argument that indicates which plugin is intended
+ * to act on the rule.  The plugin an2ln function must return
+ * KRB5_PLUGIN_NO_HANDLE if the rule is not applicable to it.
+ *
+ * The plugin an2ln function has the following arguments, in this order:
+ *
+ * -# plug_ctx, the context value output by the plugin's init function
+ * -# context, a krb5_context
+ * -# rule, the aname_to_lname rule being evaluated (from krb5.conf(5))
+ * -# aname, the krb5_principal to be mapped to an lname
+ * -# set_res_f, a function the plugin must call to set its result
+ * -# set_res_ctx, the first argument to set_res_f (the second is the result lname string)
+ *
+ * @ingroup krb5_support
+ */
+typedef struct krb5plugin_an2ln_ftable_desc {
+    HEIM_PLUGIN_FTABLE_COMMON_ELEMENTS(krb5_context);
+    krb5_error_code	(KRB5_LIB_CALL *an2ln)(void *, krb5_context, const char *,
+	                         krb5_const_principal, set_result_f, void *);
+} krb5plugin_an2ln_ftable;
+
+#endif /* HEIMDAL_KRB5_AN2LN_PLUGIN_H */
+