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/*
* Copyright (c) 2015-16 David Lamparter, for NetDEF, Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <dlfcn.h>
#include "module.h"
#include "memory.h"
#include "version.h"
DEFINE_MTYPE_STATIC(LIB, MODULE_LOADNAME, "Module loading name")
DEFINE_MTYPE_STATIC(LIB, MODULE_LOADARGS, "Module loading arguments")
static struct frrmod_info frrmod_default_info = {
.name = "libfrr",
.version = FRR_VERSION,
.description = "libfrr core module",
};
union _frrmod_runtime_u frrmod_default = {
.r =
{
.info = &frrmod_default_info,
.finished_loading = 1,
},
};
// if defined(HAVE_SYS_WEAK_ALIAS_ATTRIBUTE)
// union _frrmod_runtime_u _frrmod_this_module
// __attribute__((weak, alias("frrmod_default")));
// elif defined(HAVE_SYS_WEAK_ALIAS_PRAGMA)
#pragma weak _frrmod_this_module = frrmod_default
// else
// error need weak symbol support
// endif
struct frrmod_runtime *frrmod_list = &frrmod_default.r;
static struct frrmod_runtime **frrmod_last = &frrmod_default.r.next;
static const char *execname = NULL;
void frrmod_init(struct frrmod_runtime *modinfo)
{
modinfo->finished_loading = 1;
*frrmod_last = modinfo;
frrmod_last = &modinfo->next;
execname = modinfo->info->name;
}
struct frrmod_runtime *frrmod_load(const char *spec, const char *dir, char *err,
size_t err_len)
{
void *handle = NULL;
char name[PATH_MAX], fullpath[PATH_MAX * 2], *args;
struct frrmod_runtime *rtinfo, **rtinfop;
const struct frrmod_info *info;
snprintf(name, sizeof(name), "%s", spec);
args = strchr(name, ':');
if (args)
*args++ = '\0';
if (!strchr(name, '/')) {
if (execname) {
snprintf(fullpath, sizeof(fullpath), "%s/%s_%s.so", dir,
execname, name);
handle = dlopen(fullpath, RTLD_NOW | RTLD_GLOBAL);
}
if (!handle) {
snprintf(fullpath, sizeof(fullpath), "%s/%s.so", dir,
name);
handle = dlopen(fullpath, RTLD_NOW | RTLD_GLOBAL);
}
}
if (!handle) {
snprintf(fullpath, sizeof(fullpath), "%s", name);
handle = dlopen(fullpath, RTLD_NOW | RTLD_GLOBAL);
}
if (!handle) {
if (err)
snprintf(err, err_len,
"loading module \"%s\" failed: %s", name,
dlerror());
return NULL;
}
rtinfop = dlsym(handle, "frr_module");
if (!rtinfop) {
dlclose(handle);
if (err)
snprintf(err, err_len,
"\"%s\" is not an FRR module: %s", name,
dlerror());
return NULL;
}
rtinfo = *rtinfop;
rtinfo->load_name = XSTRDUP(MTYPE_MODULE_LOADNAME, name);
rtinfo->dl_handle = handle;
if (args)
rtinfo->load_args = XSTRDUP(MTYPE_MODULE_LOADARGS, args);
info = rtinfo->info;
if (rtinfo->finished_loading) {
dlclose(handle);
if (err)
snprintf(err, err_len, "module \"%s\" already loaded",
name);
goto out_fail;
}
if (info->init && info->init()) {
dlclose(handle);
if (err)
snprintf(err, err_len,
"module \"%s\" initialisation failed", name);
goto out_fail;
}
rtinfo->finished_loading = 1;
*frrmod_last = rtinfo;
frrmod_last = &rtinfo->next;
return rtinfo;
out_fail:
XFREE(MTYPE_MODULE_LOADARGS, rtinfo->load_args);
XFREE(MTYPE_MODULE_LOADNAME, rtinfo->load_name);
return NULL;
}
#if 0
void frrmod_unload(struct frrmod_runtime *module)
{
}
#endif
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