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/*
* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation (or any later at your option).
*
* This code has been sponsored by Vyatta Inc. <http://www.vyatta.com>
*/
#include "helper.h"
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dlfcn.h>
static LIST_HEAD(helper_list);
void helper_register(struct ctd_helper *helper)
{
list_add(&helper->head, &helper_list);
}
static struct ctd_helper *
__helper_find(const char *helper_name, uint8_t l4proto)
{
struct ctd_helper *cur, *helper = NULL;
list_for_each_entry(cur, &helper_list, head) {
if (strncmp(cur->name, helper_name, CTD_HELPER_NAME_LEN) != 0)
continue;
if (cur->l4proto != l4proto)
continue;
helper = cur;
break;
}
return helper;
}
struct ctd_helper *
helper_find(const char *libdir_path,
const char *helper_name, uint8_t l4proto, int flag)
{
char path[PATH_MAX];
struct ctd_helper *helper;
struct stat sb;
helper = __helper_find(helper_name, l4proto);
if (helper != NULL)
return helper;
snprintf(path, sizeof(path), "%s/ct_helper_%s.so",
libdir_path, helper_name);
if (stat(path, &sb) != 0) {
if (errno == ENOENT)
return NULL;
fprintf(stderr, "%s: %s\n", path,
strerror(errno));
return NULL;
}
if (dlopen(path, flag) == NULL) {
fprintf(stderr, "%s: %s\n", path, dlerror());
return NULL;
}
return __helper_find(helper_name, l4proto);
}
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