Add first version of the plugin interface.
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@18997 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
230
lib/krb5/plugin.c
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230
lib/krb5/plugin.c
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/*
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* Copyright (c) 2006 Kungliga Tekniska H<>gskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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RCSID("$Id$");
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif
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#include <dirent.h>
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struct krb5_plugin {
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void *symbol;
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void *dsohandle;
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struct krb5_plugin *next;
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};
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struct plugin {
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enum plugin_type type;
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void *name;
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void *symbol;
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struct plugin *next;
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};
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static HEIMDAL_MUTEX plugin_mutex = HEIMDAL_MUTEX_INITIALIZER;
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struct plugin *registered = NULL;
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/*
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*
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*/
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void *
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_krb5_plugin_get_symbol(struct krb5_plugin *p)
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{
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return p->symbol;
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}
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struct krb5_plugin *
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_krb5_plugin_get_next(struct krb5_plugin *p)
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{
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return p->next;
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}
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/*
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*
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*/
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static krb5_error_code
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loadlib(krb5_context context,
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enum plugin_type type,
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const char *name,
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const char *lib,
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struct krb5_plugin **e)
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{
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*e = calloc(1, sizeof(**e));
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if (*e == NULL) {
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krb5_set_error_string(context, "out of memory");
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return ENOMEM;
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}
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(*e)->dsohandle = dlopen(lib, 0);
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if ((*e)->dsohandle == NULL) {
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free(*e);
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krb5_set_error_string(context, "Failed to load %s: %s",
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lib, dlerror());
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return ENOMEM;
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}
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/* dlsym doesn't care about the type */
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(*e)->symbol = dlsym((*e)->dsohandle, name);
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if ((*e)->symbol == NULL) {
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dlclose((*e)->dsohandle);
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free(*e);
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krb5_clear_error_string(context);
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return ENOMEM;
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}
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return 0;
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}
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krb5_error_code
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_krb5_plugin_register(krb5_context context,
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enum plugin_type type,
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const char *name,
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void *symbol)
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{
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struct plugin *e;
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e = calloc(1, sizeof(*e));
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if (e == NULL) {
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krb5_set_error_string(context, "out of memory");
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return ENOMEM;
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}
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e->type = type;
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e->name = strdup(name);
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if (e->name == NULL) {
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free(e);
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krb5_set_error_string(context, "out of memory");
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return ENOMEM;
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}
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e->symbol = symbol;
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HEIMDAL_MUTEX_lock(&plugin_mutex);
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e->next = registered;
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registered = e;
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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return 0;
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}
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krb5_error_code
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_krb5_plugin_find(krb5_context context,
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enum plugin_type type,
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const char *name,
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struct krb5_plugin **list)
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{
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struct krb5_plugin *e;
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struct plugin *p;
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krb5_error_code ret;
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const char *dir;
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struct dirent *entry;
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char *path;
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DIR *d = NULL;
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*list = NULL;
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HEIMDAL_MUTEX_lock(&plugin_mutex);
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for (p = registered; p != NULL; p = p->next) {
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if (p->type != type || strcmp(p->name, name) != 0)
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continue;
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e = calloc(1, sizeof(*e));
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if (e == NULL) {
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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krb5_set_error_string(context, "out of memory");
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ret = ENOMEM;
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goto out;
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}
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e->symbol = p->symbol;
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e->dsohandle = NULL;
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e->next = *list;
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*list = e;
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}
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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dir = "/usr/heimdal/lib/krb5/plugins";
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/* XXX allow more directories */
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d = opendir(dir);
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if (d == NULL) {
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if (*list == NULL) {
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ret = errno;
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krb5_set_error_string(context, "failed to open directory %s", dir);
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return ret;
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}
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return 0;
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}
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while ((entry = readdir(d)) != NULL) {
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asprintf(&path, "%s/%s", dir, entry->d_name);
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if (path == NULL) {
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krb5_set_error_string(context, "out of memory");
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ret = ENOMEM;
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goto out;
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}
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ret = loadlib(context, type, name, path, &e);
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free(path);
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if (ret)
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continue;
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e->next = *list;
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*list = e;
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}
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closedir(d);
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return 0;
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out:
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if (d)
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closedir(d);
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_krb5_plugin_free(*list);
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*list = NULL;
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return ret;
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}
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void
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_krb5_plugin_free(struct krb5_plugin *list)
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{
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struct krb5_plugin *next;
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while (list) {
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next = list->next;
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if (list->dsohandle)
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dlclose(list->dsohandle);
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free(list);
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list = next;
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}
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}
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