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/*
* Copyright (C) 2000-2008, Parallels, Inc. All rights reserved.
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <unistd.h>
#include <dirent.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdio.h>
#include "modules.h"
#include "logger.h"
#define SH_LIB_EXT ".so"
static int add_mod(struct mod_action *action, struct mod_info *mod_info,
char *fname)
{
struct mod *mod;
if (action->mod_list == NULL)
action->mod_list = malloc(sizeof(*action->mod_list));
else
action->mod_list = realloc(action->mod_list,
sizeof(*action->mod_list) * (action->mod_count + 1));
if (action->mod_list == NULL)
return -1;
mod = &action->mod_list[action->mod_count];
if (mod_info->alloc_data != NULL)
mod->data = mod_info->alloc_data();
else
mod->data = NULL;
mod->mod_info = mod_info;
mod->fname = strdup(fname);
if (mod_info->init != NULL)
mod_info->init(mod->data);
action->mod_count++;
return 0;
}
void free_modules(struct mod_action *action)
{
int i;
struct mod *mod;
if (action->mod_list == NULL)
return;
for (i = 0, mod = action->mod_list; i < action->mod_count; i++, mod++) {
if (mod->fname != NULL)
free(mod->fname);
if (mod->mod_info != NULL && mod->mod_info->free_data != NULL)
mod->mod_info->free_data(mod->data);
}
free(action->mod_list);
action->mod_count = 0;
action->mod_list = NULL;
}
static void *open_dlib(char *fname)
{
return dlopen(fname, RTLD_NOW);
}
static void *find_dsym(void *h, char *symbol)
{
return dlsym(h, symbol);
}
static void close_dlib(void *h)
{
dlclose(h);
}
int add_module(char *fname, struct mod_action *action, const char *name)
{
void *h;
void *(*fn) (void);
struct mod_info *mod_info;
if ((h = open_dlib(fname)) == NULL) {
logger(-1, 0, "Unable to open %s: %s", fname, dlerror());
return -1;
}
if ((fn = find_dsym(h, MOD_INFO_SYM)) != NULL) {
mod_info = fn();
if (is_mod_action(mod_info, name)) {
logger(2, 0, "Add module %s", fname);
mod_info->handle = h;
add_mod(action, mod_info, fname);
} else {
close_dlib(h);
}
} else {
logger(2, 0, "Warning: no " MOD_INFO_SYM " found in %s", fname);
close_dlib(h);
}
return 0;
}
void init_modules(struct mod_action *action, const char *name)
{
char *pext;
DIR *dir;
struct dirent *ent;
struct stat st;
char fname[256];
dir = opendir(MOD_DIR);
if (!dir) {
return;
}
while ((ent = readdir(dir)) != NULL) {
snprintf(fname, sizeof(fname), "%s/%s", MOD_DIR, ent->d_name);
if (stat(fname, &st))
continue;
/* FIxme: handle symlink
* add dup detection
*/
if (!S_ISREG(st.st_mode))
continue;
if ((pext = strrchr(ent->d_name, '.')) != NULL &&
!strcmp(pext, SH_LIB_EXT))
{
add_module(fname, action, name);
}
}
closedir(dir);
}