287 lines
6.4 KiB
C
287 lines
6.4 KiB
C
/*
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This file is part of actube.
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actube 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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libcapwap 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 Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file
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* @brief Functions for modules (mods) management.
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*/
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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 "action.h"
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#include "mbag.h"
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#include "mavl.h"
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#include "dbg.h"
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#include "log.h"
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#include "file.h"
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#include "cw.h"
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#include "cw/message_set.h"
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static void (*actions_registered_cb) (struct cw_Mod * capwap, struct cw_Mod * bindings,
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struct cw_actiondef * actions) = NULL;
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void mod_set_actions_registered_cb(void (*fun)
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(struct cw_Mod *, struct cw_Mod *,
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struct cw_actiondef *))
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{
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actions_registered_cb = fun;
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}
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struct cache_item {
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const char *capwap;
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const char *bindings;
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struct cw_MsgSet * msgset;
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};
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static struct mavl *msgset_cache = NULL;
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static int mod_null_register_actions(struct cw_actiondef *def, int mode)
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{
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return 0;
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}
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/**
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* mod_null is a dummy mod
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*/
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struct cw_Mod mod_null = {
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.name = "none",
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.register_actions = mod_null_register_actions,
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};
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static int cmp(const void *p1, const void *p2)
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{
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struct cache_item *c1 = (struct cache_item *) p1;
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struct cache_item *c2 = (struct cache_item *) p2;
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int r;
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r = strcmp(c1->capwap, c2->capwap);
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if (r != 0)
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return r;
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return strcmp(c1->bindings, c2->bindings);
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}
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struct cw_actiondef *mod_cache_get(const char *capwap, const char *bindings)
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{
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return NULL;
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}
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struct cw_MsgSet *cw_mod_get_msg_set(struct conn *conn,
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struct cw_Mod * capwap_mod, struct cw_Mod *bindings_mod)
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{
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if (!msgset_cache) {
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msgset_cache = mavl_create(cmp, NULL);
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if (!msgset_cache) {
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cw_log(LOG_ERR, "Can't initialize msgset cache: %s",
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strerror(errno));
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return NULL;
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}
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}
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struct cache_item search;
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search.capwap = capwap_mod->name;
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search.bindings = bindings_mod->name;
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struct cache_item * cached_set = mavl_get(msgset_cache, &search);
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if (cached_set) {
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cw_dbg(DBG_INFO, "Using cached message set for %s,%s", capwap_mod->name, bindings_mod->name);
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return cached_set->msgset;
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}
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cached_set = malloc(sizeof(struct cache_item));
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if (!cached_set) {
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cw_log(LOG_ERR, "Can't allocate memory for mod cache item %s",
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strerror(errno));
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return NULL;
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}
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memset(cached_set, 0, sizeof(struct cache_item));
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struct cw_MsgSet * set = cw_msgset_create();
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if (!set) {
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free(cached_set);
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cw_log(LOG_ERR, "Can't allocate memory for mod cache item %s",
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strerror(errno));
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return NULL;
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}
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cached_set->msgset=set;
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cw_dbg(DBG_INFO, "Loading message set for %s,%s", capwap_mod->name, bindings_mod->name);
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if (capwap_mod) {
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cached_set->capwap = capwap_mod->name;
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//c->register_actions(&(i->actions), CW_MOD_MODE_CAPWAP);
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capwap_mod->register_messages(cached_set->msgset,CW_MOD_MODE_CAPWAP);
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}
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if (bindings_mod) {
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cached_set->bindings = bindings_mod->name;
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//b->register_actions(&(i->actions), MOD_MODE_BINDINGS);
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}
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// if (actions_registered_cb)
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// actions_registered_cb(capwap_mod, bindings_mod, &(cached_set->actions));
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mavl_add(msgset_cache, cached_set);
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return cached_set->msgset;
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}
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/* static mavl to store modules */
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static struct mavl * mods_loaded = NULL;
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static int mod_cmp(const void *e1, const void *e2){
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const struct cw_Mod * m1 = e1;
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const struct cw_Mod * m2 = e2;
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return strcmp(m1->name,m2->name);
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}
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static const char * mod_path="./";
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void cw_mod_set_mod_path(const char * path){
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mod_path = path;
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}
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/**
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* @brief Load a module
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* @param mod_name Name of the module
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* @return a pointer to the module interface
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*/
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struct cw_Mod * cw_mod_load(const char * mod_name){
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/* if modlist is not initialized, initialize ... */
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if (mods_loaded==NULL){
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mods_loaded=mavl_create(mod_cmp,NULL);
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if (mods_loaded==NULL){
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cw_log(LOG_ERROR, "Can't init modlist, no memory");
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return NULL;
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}
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}
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/* Search for the module in mods_loaded, to see if it is
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* already loaded or was statically linked */
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struct cw_Mod search;
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memset(&search,0,sizeof(search));
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search.name=mod_name;
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struct cw_Mod * mod;
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mod = mavl_find(mods_loaded,&search);
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if (mod){
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return mod;
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}
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if (strlen(mod_name)>CW_MOD_MAX_MOD_NAME_LEN){
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cw_log(LOG_ERROR,"Mod name too long: %s (max allowed = %d)",
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mod_name,CW_MOD_MAX_MOD_NAME_LEN);
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return NULL;
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}
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char mod_filename[CW_MOD_MAX_MOD_NAME_LEN+5];
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sprintf(mod_filename,"mod_%s",mod_name);
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/* we have to load the module dynamically */
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char * filename;
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filename = cw_filename(mod_path,mod_filename,".so");
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if (filename==NULL)
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return NULL;
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cw_log(LOG_ERROR,"DLOPEN now !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
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/* Open the DLL */
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void * handle;
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handle = dlopen(filename,RTLD_NOW);
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if (!handle){
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cw_log(LOG_ERROR,"Failed to load module: %s",dlerror());
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goto errX;
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}
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struct cw_Mod * (*mod_get_interface)();
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mod_get_interface = dlsym(handle,mod_filename);
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if (!mod_get_interface){
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cw_log(LOG_ERROR,"Failed to load module: %s",dlerror());
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goto errX;
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}
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mod = mod_get_interface();
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mod->dll_handle=handle;
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if (!mavl_add(mods_loaded,mod)){
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dlclose(handle);
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cw_log(LOG_ERR,"Can' add module %s",mod_name);
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goto errX;
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}
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mod->init();
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errX:
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free(filename);
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return mod;
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}
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static struct mlist * mods_list = NULL;
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struct cw_Mod * cw_mod_add_to_list(struct cw_Mod * mod ){
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if (!mods_list){
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mods_list = mlist_create(mod_cmp);
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if (!mods_list){
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cw_log(LOG_ERROR,"Can't init mods_list");
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return 0;
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}
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}
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return mlist_append(mods_list,mod)->data;
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}
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struct cw_Mod * cw_mod_detect(struct conn *conn,
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uint8_t * rawmsg, int len,
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int elems_len, struct sockaddr *from,
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int mode){
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if (mods_list==NULL)
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return MOD_NULL;
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struct mlist_elem * e;
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mlist_foreach(e,mods_list){
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struct cw_Mod * mod = e->data;
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cw_dbg(DBG_MOD,"Checking mod: %s",mod->name);
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/* if there is no detect method, skip */
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if (!mod->detect)
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continue;
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if ( mod->detect(conn,rawmsg,len,elems_len,from,mode) ){
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return mod;
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}
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}
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return MOD_NULL;
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}
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