2 * Copyright (c) 2006 - 2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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34 #include "krb5_locl.h"
35 RCSID("$Id: plugin.c,v 1.4 2007/01/09 17:46:01 lha Exp $");
44 struct krb5_plugin *next;
48 enum plugin_type type;
54 static HEIMDAL_MUTEX plugin_mutex = HEIMDAL_MUTEX_INITIALIZER;
55 static struct plugin *registered = NULL;
57 static const char *plugin_dir = LIBDIR "/plugin/krb5";
64 _krb5_plugin_get_symbol(struct krb5_plugin *p)
70 _krb5_plugin_get_next(struct krb5_plugin *p)
79 static krb5_error_code
80 loadlib(krb5_context context,
81 enum plugin_type type,
84 struct krb5_plugin **e)
86 *e = calloc(1, sizeof(**e));
88 krb5_set_error_string(context, "out of memory");
96 (*e)->dsohandle = dlopen(lib, RTLD_LAZY);
97 if ((*e)->dsohandle == NULL) {
99 krb5_set_error_string(context, "Failed to load %s: %s",
104 /* dlsym doesn't care about the type */
105 (*e)->symbol = dlsym((*e)->dsohandle, name);
106 if ((*e)->symbol == NULL) {
107 dlclose((*e)->dsohandle);
109 krb5_clear_error_string(context);
117 _krb5_plugin_register(krb5_context context,
118 enum plugin_type type,
124 e = calloc(1, sizeof(*e));
126 krb5_set_error_string(context, "out of memory");
130 e->name = strdup(name);
131 if (e->name == NULL) {
133 krb5_set_error_string(context, "out of memory");
138 HEIMDAL_MUTEX_lock(&plugin_mutex);
139 e->next = registered;
141 HEIMDAL_MUTEX_unlock(&plugin_mutex);
147 _krb5_plugin_find(krb5_context context,
148 enum plugin_type type,
150 struct krb5_plugin **list)
152 struct krb5_plugin *e;
155 char *sysdirs[2] = { NULL, NULL };
156 char **dirs = NULL, **di;
157 struct dirent *entry;
163 HEIMDAL_MUTEX_lock(&plugin_mutex);
165 for (p = registered; p != NULL; p = p->next) {
166 if (p->type != type || strcmp(p->name, name) != 0)
169 e = calloc(1, sizeof(*e));
171 HEIMDAL_MUTEX_unlock(&plugin_mutex);
172 krb5_set_error_string(context, "out of memory");
176 e->symbol = p->symbol;
181 HEIMDAL_MUTEX_unlock(&plugin_mutex);
183 dirs = krb5_config_get_strings(context, NULL, "libdefaults",
186 sysdirs[0] = rk_UNCONST(plugin_dir);
190 for (di = dirs; *di != NULL; di++) {
196 while ((entry = readdir(d)) != NULL) {
197 asprintf(&path, "%s/%s", *di, entry->d_name);
199 krb5_set_error_string(context, "out of memory");
203 ret = loadlib(context, type, name, path, &e);
214 krb5_config_free_strings(dirs);
217 krb5_set_error_string(context, "Did not find a plugin for %s", name);
224 if (dirs && dirs != sysdirs)
225 krb5_config_free_strings(dirs);
228 _krb5_plugin_free(*list);
235 _krb5_plugin_free(struct krb5_plugin *list)
237 struct krb5_plugin *next;
241 dlclose(list->dsohandle);