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Olof hagsand
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277
apps/netconf/netconf_plugin.c
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277
apps/netconf/netconf_plugin.c
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/*
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*
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Copyright (C) 2009-2016 Olof Hagsand and Benny Holmgren
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This file is part of CLICON.
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CLICON 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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CLICON 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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You should have received a copy of the GNU General Public License
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along with CLICON; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>.
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*
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* handling netconf plugins
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*/
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#ifdef HAVE_CONFIG_H
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#include "clicon_config.h" /* generated by config & autoconf */
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <syslog.h>
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#include <errno.h>
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#include <assert.h>
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#include <dlfcn.h>
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#include <dirent.h>
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#include <grp.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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/* cligen */
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#include <cligen/cligen.h>
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/* clicon */
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#include <clicon/clicon.h>
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/* clicon netconf*/
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#include "clicon_netconf.h"
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#include "netconf_lib.h"
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#include "netconf_plugin.h"
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/*
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* Unload a plugin
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*/
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static int
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plugin_unload(clicon_handle h, void *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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/*
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* Load a dynamic plugin object and call it's init-function
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* Note 'file' may be destructively modified
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*/
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static plghndl_t
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plugin_load (clicon_handle h, char *file, int dlflags, const char *cnklbl)
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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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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 quit;
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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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if (initfn(h) != 0) {
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clicon_err(OE_PLUGIN, errno, "Failed to initiate %s\n", strrchr(file,'/')?strchr(file, '/'):file);
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goto quit;
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}
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}
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quit:
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return handle;
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}
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static int nplugins = 0;
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static plghndl_t *plugins = NULL;
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static netconf_reg_t *deps = NULL;
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/*
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* netconf_plugin_load
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* Load allplugins you can find in CLICON_NETCONF_DIR
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*/
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int
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netconf_plugin_load(clicon_handle h)
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{
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int retval = -1;
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char *dir;
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int ndp;
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struct dirent *dp;
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int i;
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char *filename;
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plghndl_t *handle;
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if ((dir = clicon_netconf_dir(h)) == NULL){
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clicon_err(OE_PLUGIN, 0, "clicon_netconf_dir not defined");
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goto quit;
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}
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/* Get plugin objects names from plugin directory */
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if((ndp = clicon_file_dirent(dir, &dp, "(.so)$", S_IFREG, __FUNCTION__))<0)
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goto quit;
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/* Load all plugins */
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for (i = 0; i < ndp; i++) {
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filename = chunk_sprintf(__FUNCTION__, "%s/%s", dir, dp[i].d_name);
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clicon_debug(1, "DEBUG: Loading plugin '%.*s' ...",
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(int)strlen(filename), filename);
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if (filename == NULL) {
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clicon_err(OE_UNIX, errno, "chunk");
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goto quit;
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}
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if ((handle = plugin_load (h, filename, RTLD_NOW, __FUNCTION__)) == NULL)
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goto quit;
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if ((plugins = rechunk(plugins, (nplugins+1) * sizeof (*plugins), NULL)) == NULL) {
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clicon_err(OE_UNIX, errno, "chunk");
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goto quit;
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}
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plugins[nplugins++] = handle;
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unchunk (filename);
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}
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retval = 0;
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quit:
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unchunk_group(__FUNCTION__);
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return retval;
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}
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int
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netconf_plugin_unload(clicon_handle h)
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{
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int i;
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netconf_reg_t *nr;
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while((nr = deps) != NULL) {
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DELQ(nr, deps, netconf_reg_t *);
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if (nr->nr_tag)
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free(nr->nr_tag);
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free(nr);
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}
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for (i = 0; i < nplugins; i++)
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plugin_unload(h, plugins[i]);
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if (plugins)
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unchunk(plugins);
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nplugins = 0;
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return 0;
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}
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/*
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* Call plugin_start in all plugins
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*/
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int
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netconf_plugin_start(clicon_handle h, int argc, char **argv)
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{
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int i;
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plgstart_t *startfn;
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for (i = 0; i < nplugins; i++) {
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/* Call exit function is it exists */
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if ((startfn = dlsym(plugins[i], PLUGIN_START)) == NULL)
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break;
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optind = 0;
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if (startfn(h, argc, argv) < 0) {
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clicon_debug(1, "plugin_start() failed\n");
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return -1;
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}
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}
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return 0;
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}
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/*
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* netconf_register_callback
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* Called from plugin to register a callback for a specific netconf XML tag.
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*/
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int
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netconf_register_callback(clicon_handle h,
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netconf_cb_t cb, /* Callback called */
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void *arg, /* Arg to send to callback */
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char *tag) /* Xml tag when callback is made */
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{
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netconf_reg_t *nr;
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if ((nr = malloc(sizeof(netconf_reg_t))) == NULL) {
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clicon_err(OE_DB, errno, "malloc: %s", strerror(errno));
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goto catch;
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}
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memset (nr, 0, sizeof (*nr));
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nr->nr_callback = cb;
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nr->nr_arg = arg;
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nr->nr_tag = strdup(tag); /* strdup */
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INSQ(nr, deps);
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return 0;
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catch:
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if (nr){
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if (nr->nr_tag)
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free(nr->nr_tag);
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free(nr);
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}
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return -1;
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}
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/*! See if there is any callback registered for this tag
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*
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* @param xn Sub-tree (under xorig) at child of rpc: <rpc><xn></rpc>.
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* @param xf Output xml stream. For reply
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* @param xf_err Error xml stream. For error reply
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* @param xorig Original request.
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*
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* @retval -1 Error
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* @retval 0 OK, not found handler.
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* @retval 1 OK, handler called
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*/
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int
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netconf_plugin_callbacks(clicon_handle h,
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cxobj *xn,
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cbuf *xf,
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cbuf *xf_err,
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cxobj *xorig)
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{
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netconf_reg_t *nr;
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int retval;
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if (deps == NULL)
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return 0;
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nr = deps;
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do {
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if (strcmp(nr->nr_tag, xml_name(xn)) == 0){
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if ((retval = nr->nr_callback(h,
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xorig,
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xn,
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xf,
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xf_err,
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nr->nr_arg)) < 0)
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return -1;
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else
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return 1; /* handled */
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}
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nr = NEXTQ(netconf_reg_t *, nr);
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} while (nr != deps);
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return 0;
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}
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