160 lines
4.5 KiB
C
160 lines
4.5 KiB
C
/*
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*
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***** BEGIN LICENSE BLOCK *****
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Copyright (C) 2009-2017 Olof Hagsand and Benny Holmgren
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This file is part of CLIXON.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 3 or later (the "GPL"),
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in which case the provisions of the GPL are applicable instead
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of those above. If you wish to allow use of your version of this file only
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under the terms of the GPL, and not to allow others to
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use your version of this file under the terms of Apache License version 2,
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indicate your decision by deleting the provisions above and replace them with
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the notice and other provisions required by the GPL. If you do not delete
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the provisions above, a recipient may use your version of this file under
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the terms of any one of the Apache License version 2 or the GPL.
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***** END LICENSE BLOCK *****
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*/
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#ifdef HAVE_CONFIG_H
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#include "clixon_config.h" /* generated by config & autoconf */
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <dlfcn.h>
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#include "clixon_err.h"
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#include "clixon_queue.h"
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#include "clixon_hash.h"
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#include "clixon_log.h"
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#include "clixon_handle.h"
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#include "clixon_plugin.h"
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static find_plugin_t *
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clicon_find_plugin(clicon_handle h)
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{
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void *p;
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find_plugin_t *fp = NULL;
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clicon_hash_t *data = clicon_data(h);
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if ((p = hash_value(data, "CLICON_FIND_PLUGIN", NULL)) != NULL)
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memcpy(&fp, p, sizeof(fp));
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return fp;
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}
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/*! Return a function pointer based on name of plugin and function.
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* If plugin is specified, ask daemon registered function to return
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* the dlsym handle of the plugin.
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*/
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void *
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clicon_find_func(clicon_handle h, char *plugin, char *func)
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{
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find_plugin_t *plgget;
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void *dlhandle = NULL;
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if (plugin) {
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/* find clicon_plugin_get() in global namespace */
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if ((plgget = clicon_find_plugin(h)) == NULL) {
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clicon_err(OE_UNIX, errno, "Specified plugin not supported");
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return NULL;
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}
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dlhandle = plgget(h, plugin);
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}
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return dlsym(dlhandle, func);
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}
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/*! Load a dynamic plugin object and call its init-function
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* Note 'file' may be destructively modified
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* @param[in] h Clicon handle
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* @param[in] file Which plugin to load
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* @param[in] dlflags See man(3) dlopen
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*/
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plghndl_t
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plugin_load(clicon_handle h,
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char *file,
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int dlflags)
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{
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char *error;
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void *handle = NULL;
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plginit_t *initfn;
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clicon_debug(1, "%s", __FUNCTION__);
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dlerror(); /* Clear any existing error */
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if ((handle = dlopen (file, dlflags)) == NULL) {
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error = (char*)dlerror();
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clicon_err(OE_PLUGIN, errno, "dlopen: %s\n", error ? error : "Unknown error");
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goto done;
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}
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/* call plugin_init() if defined */
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if ((initfn = dlsym(handle, PLUGIN_INIT)) == NULL){
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clicon_err(OE_PLUGIN, errno, "Failed to find plugin_init when loading restconf plugin %s", file);
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goto err;
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}
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if ((error = (char*)dlerror()) != NULL) {
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clicon_err(OE_UNIX, 0, "dlsym: %s: %s", file, error);
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goto done;
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}
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if (initfn(h) != 0) {
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clicon_err(OE_PLUGIN, errno, "Failed to initiate %s", strrchr(file,'/')?strchr(file, '/'):file);
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if (!clicon_errno) /* sanity: log if clicon_err() is not called ! */
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clicon_err(OE_DB, 0, "Unknown error: %s: plugin_init does not make clicon_err call on error",
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file);
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goto err;
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}
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done:
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return handle;
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err:
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if (handle)
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dlclose(handle);
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return NULL;
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}
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/*! Unload a plugin
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* @param[in] h Clicon handle
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* @param[in] handle Clicon handle
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*/
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int
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plugin_unload(clicon_handle h,
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plghndl_t *handle)
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{
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int retval = 0;
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char *error;
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plgexit_t *exitfn;
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/* Call exit function is it exists */
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exitfn = dlsym(handle, PLUGIN_EXIT);
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if (dlerror() == NULL)
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exitfn(h);
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dlerror(); /* Clear any existing error */
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if (dlclose(handle) != 0) {
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error = (char*)dlerror();
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clicon_err(OE_PLUGIN, errno, "dlclose: %s\n", error ? error : "Unknown error");
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/* Just report */
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}
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return retval;
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}
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