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/*
* plugin.c: plugin handling
*
* Copyright (c) 2011 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vlib/unix/plugin.h>
#include <dlfcn.h>
#include <dirent.h>
plugin_main_t vlib_plugin_main;
void vlib_set_get_handoff_structure_cb (void *cb)
{
plugin_main_t * pm = &vlib_plugin_main;
pm->handoff_structure_get_cb = cb;
}
static void * vnet_get_handoff_structure (void)
{
void * (*fp)(void);
fp = vlib_plugin_main.handoff_structure_get_cb;
if (fp == 0)
return 0;
else
return (*fp)();
}
static int
load_one_plugin (plugin_main_t *pm, plugin_info_t *pi, int from_early_init)
{
void *handle, *register_handle;
clib_error_t * (*fp)(vlib_main_t *, void *, int);
clib_error_t * error;
void *handoff_structure;
handle = dlopen ((char *)pi->name, RTLD_LAZY);
/*
* Note: this can happen if the plugin has an undefined symbol reference,
* so print a warning. Otherwise, the poor slob won't know what happened.
* Ask me how I know that...
*/
if (handle == 0)
{
clib_warning ("%s", dlerror());
return -1;
}
pi->handle = handle;
register_handle = dlsym (pi->handle, "vlib_plugin_register");
if (register_handle == 0)
{
dlclose (handle);
return 0;
}
fp = register_handle;
handoff_structure = vnet_get_handoff_structure();
if (handoff_structure == 0)
error = clib_error_return (0, "handoff structure callback returned 0");
else
error = (*fp)(pm->vlib_main, handoff_structure, from_early_init);
if (error)
{
clib_error_report (error);
dlclose (handle);
return 1;
}
clib_warning ("Loaded plugin: %s", pi->name);
return 0;
}
static u8 **split_plugin_path (plugin_main_t *pm)
{
int i;
u8 **rv = 0;
u8 *path = pm->plugin_path;
u8 *this = 0;
for (i = 0; i < vec_len (pm->plugin_path); i++)
{
if (path[i] != ':')
{
vec_add1(this, path[i]);
continue;
}
vec_add1(this, 0);
vec_add1 (rv, this);
this = 0;
}
if (this)
{
vec_add1 (this, 0);
vec_add1 (rv, this);
}
return rv;
}
int vlib_load_new_plugins (plugin_main_t *pm, int from_early_init)
{
DIR *dp;
struct dirent *entry;
struct stat statb;
uword *p;
plugin_info_t *pi;
u8 **plugin_path;
int i;
plugin_path = split_plugin_path (pm);
for (i = 0; i < vec_len (plugin_path); i++)
{
dp = opendir ((char *)plugin_path[i]);
if (dp == 0)
continue;
while ((entry = readdir (dp)))
{
u8 *plugin_name;
if (pm->plugin_name_filter)
{
int j;
for (j = 0; j < vec_len (pm->plugin_name_filter); j++)
if (entry->d_name[j] != pm->plugin_name_filter[j])
goto next;
}
plugin_name = format (0, "%s/%s%c", plugin_path[i],
entry->d_name, 0);
/* unreadable */
if (stat ((char *)plugin_name, &statb) < 0)
{
ignore:
vec_free (plugin_name);
continue;
}
/* a dir or other things which aren't plugins */
if (!S_ISREG(statb.st_mode))
goto ignore;
p = hash_get_mem (pm->plugin_by_name_hash, plugin_name);
if (p == 0)
{
vec_add2 (pm->plugin_info, pi, 1);
pi->name = plugin_name;
pi->file_info = statb;
if (load_one_plugin (pm, pi, from_early_init))
{
vec_free (plugin_name);
_vec_len (pm->plugin_info) = vec_len (pm->plugin_info) - 1;
continue;
}
memset (pi, 0, sizeof (*pi));
hash_set_mem (pm->plugin_by_name_hash, plugin_name,
pi - pm->plugin_info);
}
next:
;
}
closedir (dp);
vec_free (plugin_path[i]);
}
vec_free (plugin_path);
return 0;
}
char *vlib_plugin_path __attribute__((weak));
char *vlib_plugin_path = "";
char *vlib_plugin_name_filter __attribute__((weak));
char *vlib_plugin_name_filter = 0;
int vlib_plugin_early_init (vlib_main_t *vm)
{
plugin_main_t *pm = &vlib_plugin_main;
pm->plugin_path = format (0, "%s%c", vlib_plugin_path, 0);
clib_warning ("plugin path %s", pm->plugin_path);
if (vlib_plugin_name_filter)
pm->plugin_name_filter = format (0, "%s%c", vlib_plugin_name_filter, 0);
pm->plugin_by_name_hash = hash_create_string (0, sizeof (uword));
pm->vlib_main = vm;
return vlib_load_new_plugins (pm, 1 /* from_early_init */);
}
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