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