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idmap_plugin.c
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idmap_plugin.c
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/*
* ID Mapping Plugin interface for cifs-utils
* Copyright (C) 2012 Jeff Layton (jlayton@samba.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <dlfcn.h>
#include <errno.h>
#include <stdint.h>
#include <sys/types.h>
#include "cifsidmap.h"
#include "idmap_plugin.h"
const char *plugin_errmsg;
static void *plugin;
static void *
resolve_symbol(const char *symbol_name)
{
void *symbol;
dlerror();
symbol = dlsym(plugin, symbol_name);
if (!symbol)
plugin_errmsg = dlerror();
return symbol;
}
/*
* open the plugin. Note that we leave it open over the life of the
* program. It gets closed on exit.
*/
static int
open_plugin(void)
{
if (plugin)
return 0;
plugin = dlopen(IDMAP_PLUGIN_PATH, RTLD_LAZY);
if (!plugin) {
plugin_errmsg = dlerror();
return -EIO;
}
return 0;
}
int
init_plugin(void **handle)
{
int ret;
int (*init)(void **, const char **);
ret = open_plugin();
if (ret)
return ret;
init = resolve_symbol("cifs_idmap_init_plugin");
if (!init) {
plugin_errmsg = "cifs_idmap_init_plugin not implemented";
return -ENOSYS;
}
return (*init)(handle, &plugin_errmsg);
}
void
exit_plugin(void *handle)
{
int (*exit)(void *);
exit = resolve_symbol("cifs_idmap_exit_plugin");
if (exit)
(*exit)(handle);
}
int
sid_to_str(void *handle, const struct cifs_sid *sid, char **name)
{
int (*entry)(void *, const struct cifs_sid *, char **);
*(void **)(&entry) = resolve_symbol("cifs_idmap_sid_to_str");
if (!entry) {
plugin_errmsg = "cifs_idmap_sid_to_str not implemented";
return -ENOSYS;
}
return (*entry)(handle, sid, name);
}
int
str_to_sid(void *handle, const char *name, struct cifs_sid *sid)
{
int (*entry)(void *, const char *, struct cifs_sid *);
*(void **)(&entry) = resolve_symbol("cifs_idmap_str_to_sid");
if (!entry) {
plugin_errmsg = "cifs_idmap_str_to_sid not implemented";
return -ENOSYS;
}
return (*entry)(handle, name, sid);
}
int
sids_to_ids(void *handle, const struct cifs_sid *sid, const size_t num,
struct cifs_uxid *cuxid)
{
int (*entry)(void *handle, const struct cifs_sid *sids,
const size_t num, struct cifs_uxid *cuxid);
*(void **)(&entry) = resolve_symbol("cifs_idmap_sids_to_ids");
if (!entry) {
plugin_errmsg = "cifs_idmap_sids_to_ids not implemented";
return -ENOSYS;
}
return (*entry)(handle, sid, num, cuxid);
}
int
ids_to_sids(void *handle, const struct cifs_uxid *cuxid, const size_t num,
struct cifs_sid *sid)
{
int (*entry)(void *handle, const struct cifs_uxid *cuxid,
const size_t num, struct cifs_sid *sid);
*(void **)(&entry) = resolve_symbol("cifs_idmap_ids_to_sids");
if (!entry) {
plugin_errmsg = "cifs_idmap_ids_to_sids not implemented";
return -ENOSYS;
}
return (*entry)(handle, cuxid, num, sid);
}