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/*
* Copyright (C) 2016 "IoT.bzh"
* Author "Fulup Ar Foll"
* Author José Bollo <jose.bollo@iot.bzh>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
* Contain all generic part to handle REST/API
*
* https://www.gnu.org/software/libmicrohttpd/tutorial.html [search 'largepost.c']
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <dirent.h>
#include <dlfcn.h>
#include <unistd.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "../include/local-def.h"
#include "afb-plugins.h"
static const char plugin_register_function[] = "pluginRegister";
AFB_plugin *afb_plugins_search(AFB_session *session, const char *prefix, size_t length)
{
int i, n;
AFB_plugin **plugins, *p;
if (!length)
length = strlen(prefix);
n = session->config->pluginCount;
plugins = session->plugins;
for (i = 0 ; i < n ; i++) {
p = plugins[i];
if (p->prefixlen == length && !strcmp(p->prefix, prefix))
return p;
}
return NULL;
}
int afb_plugins_add_plugin(AFB_session *session, const char *path)
{
AFB_plugin *desc, *check, **plugins;
AFB_plugin *(*pluginRegisterFct) (void);
void *handle;
size_t len;
// This is a loadable library let's check if it's a plugin
handle = dlopen(path, RTLD_NOW | RTLD_LOCAL);
if (handle == NULL) {
fprintf(stderr, "[%s] not loadable, continuing...\n", path);
goto error;
}
/* retrieves the register function */
pluginRegisterFct = dlsym(handle, plugin_register_function);
if (!pluginRegisterFct) {
fprintf(stderr, "[%s] not an AFB plugin, continuing...\n", path);
goto error2;
}
if (verbose)
fprintf(stderr, "[%s] is a valid AFB plugin\n", path);
/* allocates enough memory */
plugins = realloc(session->plugins, ((unsigned)session->config->pluginCount + 2) * sizeof(AFB_plugin*));
if (plugins == NULL) {
fprintf(stderr, "ERROR: plugin [%s] memory missing. continuing...\n", path);
goto error2;
}
session->plugins = plugins;
/* init the plugin */
desc = pluginRegisterFct();
if (desc == NULL) {
fprintf(stderr, "ERROR: plugin [%s] register function failed. continuing...\n", path);
goto error2;
}
/* check the returned structure */
if (desc->type != AFB_PLUGIN_JSON) {
fprintf(stderr, "ERROR: plugin [%s] invalid type %d...\n", path, desc->type);
goto error2;
}
if (desc->prefix == NULL || *desc->prefix == 0) {
fprintf(stderr, "ERROR: plugin [%s] bad prefix...\n", path);
goto error2;
}
if (desc->info == NULL || *desc->info == 0) {
fprintf(stderr, "ERROR: plugin [%s] bad description...\n", path);
goto error2;
}
if (desc->apis == NULL) {
fprintf(stderr, "ERROR: plugin [%s] no APIs...\n", path);
goto error2;
}
/* check previously existing plugin */
len = strlen(desc->prefix);
check = afb_plugins_search(session, desc->prefix, len);
if (check != NULL) {
fprintf(stderr, "ERROR: plugin [%s] prefix %s duplicated...\n", path, desc->prefix);
goto error2;
}
/* Prebuild plugin jtype to boost API response */
desc->jtype = json_object_new_string(desc->prefix);
desc->prefixlen = len;
/* record the plugin */
session->plugins[session->config->pluginCount] = desc;
session->plugins[++session->config->pluginCount] = NULL;
if (verbose)
fprintf(stderr, "Loading plugin[%d] prefix=[%s] info=%s\n", session->config->pluginCount, desc->prefix, desc->info);
return 0;
error2:
dlclose(handle);
error:
return -1;
}
static int adddirs(AFB_session * session, char path[PATH_MAX], size_t end)
{
int rc;
DIR *dir;
struct dirent ent, *result;
size_t len;
/* open the DIR now */
dir = opendir(path);
if (dir == NULL) {
fprintf(stderr, "ERROR in scanning plugin directory %s, %m\n", path);
return -1;
}
if (verbose)
fprintf(stderr, "Scanning dir=[%s] for plugins\n", path);
/* scan each entry */
if (end)
path[end++] = '/';
for (;;) {
readdir_r(dir, &ent, &result);
if (result == NULL)
break;
len = strlen(ent.d_name);
if (len + end >= PATH_MAX) {
fprintf(stderr, "path too long for %s\n", ent.d_name);
continue;
}
memcpy(&path[end], ent.d_name, len+1);
if (ent.d_type == DT_DIR) {
/* case of directories */
if (ent.d_name[0] == '.') {
if (len == 1)
continue;
if (ent.d_name[1] == '.' && len == 2)
continue;
}
rc = adddirs(session, path, end+len);;
} else if (ent.d_type == DT_REG) {
/* case of files */
if (!strstr(ent.d_name, ".so"))
continue;
rc = afb_plugins_add_plugin(session, path);
}
}
closedir(dir);
return 0;
}
int afb_plugins_add_directory(AFB_session * session, const char *path)
{
size_t length;
char buffer[PATH_MAX];
length = strlen(path);
if (length >= sizeof(buffer)) {
fprintf(stderr, "path too long %lu [%.99s...]\n", (unsigned long)length, path);
return -1;
}
memcpy(buffer, path, length + 1);
return adddirs(session, buffer, length);
}
int afb_plugins_add_path(AFB_session * session, const char *path)
{
struct stat st;
int rc;
rc = stat(path, &st);
if (rc < 0)
fprintf(stderr, "Invalid plugin path [%s]: %m\n", path);
else if (S_ISDIR(st.st_mode))
rc = afb_plugins_add_directory(session, path);
else
rc = afb_plugins_add_plugin(session, path);
return rc;
}
int afb_plugins_add_pathset(AFB_session * session, const char *pathset)
{
static char sep[] = ":";
char *ps, *p;
int rc;
ps = strdupa(pathset);
for (;;) {
p = strsep(&ps, sep);
if (!p)
return 0;
rc = afb_plugins_add_path(session, p);
};
}
void initPlugins(AFB_session * session)
{
int rc = afb_plugins_add_pathset(session, session->config->ldpaths);
}
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