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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 <assert.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-req-itf.h"
#include "afb-apis.h"
struct api_desc {
AFB_plugin *plugin; /* descriptor */
size_t prefixlen;
const char *prefix;
void *handle; /* context of dlopen */
};
static struct api_desc *apis_array = NULL;
static int apis_count = 0;
static const char plugin_register_function[] = "pluginRegister";
int afb_apis_count()
{
return apis_count;
}
void afb_apis_free_context(int apiidx, void *context)
{
void (*cb)(void*);
assert(0 <= apiidx && apiidx < apis_count);
cb = apis_array[apiidx].plugin->freeCtxCB;
if (cb)
cb(context);
else
free(context);
}
const struct AFB_restapi *afb_apis_get(int apiidx, int verbidx)
{
assert(0 <= apiidx && apiidx < apis_count);
return &apis_array[apiidx].plugin->apis[verbidx];
}
int afb_apis_get_verbidx(int apiidx, const char *name)
{
const struct AFB_restapi *apis;
int idx;
assert(0 <= apiidx && apiidx < apis_count);
apis = apis_array[apiidx].plugin->apis;
for (idx = 0 ; apis[idx].name ; idx++)
if (!strcasecmp(apis[idx].name, name))
return idx;
return -1;
}
int afb_apis_get_apiidx(const char *prefix, size_t length)
{
int i;
const struct api_desc *a;
if (!length)
length = strlen(prefix);
for (i = 0 ; i < apis_count ; i++) {
a = &apis_array[i];
if (a->prefixlen == length && !strcasecmp(a->prefix, prefix))
return i;
}
return -1;
}
int afb_apis_add_plugin(const char *path)
{
struct api_desc *apis;
AFB_plugin *plugin;
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 */
apis = realloc(apis_array, ((unsigned)apis_count + 1) * sizeof * apis);
if (apis == NULL) {
fprintf(stderr, "ERROR: plugin [%s] memory missing. continuing...\n", path);
goto error2;
}
apis_array = apis;
/* init the plugin */
plugin = pluginRegisterFct();
if (plugin == NULL) {
fprintf(stderr, "ERROR: plugin [%s] register function failed. continuing...\n", path);
goto error2;
}
/* check the returned structure */
if (plugin->type != AFB_PLUGIN_JSON) {
fprintf(stderr, "ERROR: plugin [%s] invalid type %d...\n", path, plugin->type);
goto error2;
}
if (plugin->prefix == NULL || *plugin->prefix == 0) {
fprintf(stderr, "ERROR: plugin [%s] bad prefix...\n", path);
goto error2;
}
if (plugin->info == NULL || *plugin->info == 0) {
fprintf(stderr, "ERROR: plugin [%s] bad description...\n", path);
goto error2;
}
if (plugin->apis == NULL) {
fprintf(stderr, "ERROR: plugin [%s] no APIs...\n", path);
goto error2;
}
/* check previously existing plugin */
len = strlen(plugin->prefix);
if (afb_apis_get_apiidx(plugin->prefix, len) >= 0) {
fprintf(stderr, "ERROR: plugin [%s] prefix %s duplicated...\n", path, plugin->prefix);
goto error2;
}
/* record the plugin */
if (verbose)
fprintf(stderr, "Loading plugin[%lu] prefix=[%s] info=%s\n", (unsigned long)apis_count, plugin->prefix, plugin->info);
apis = &apis_array[apis_count];
apis->plugin = plugin;
apis->prefixlen = len;
apis->prefix = plugin->prefix;
apis->handle = handle;
apis_count++;
return 0;
error2:
dlclose(handle);
error:
return -1;
}
static int adddirs(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(path, end+len);;
} else if (ent.d_type == DT_REG) {
/* case of files */
if (!strstr(ent.d_name, ".so"))
continue;
rc = afb_apis_add_plugin(path);
}
}
closedir(dir);
return 0;
}
int afb_apis_add_directory(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(buffer, length);
}
int afb_apis_add_path(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_apis_add_directory(path);
else
rc = afb_apis_add_plugin(path);
return rc;
}
int afb_apis_add_pathset(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_apis_add_path(p);
};
}
/*
// Check of apiurl is declare in this plugin and call it
extern __thread sigjmp_buf *error_handler;
static int callPluginApi(AFB_request * request)
{
sigjmp_buf jmpbuf, *older;
// save context before calling the API
status = setjmp(jmpbuf);
if (status != 0) {
return 0;
}
// Trigger a timer to protect from unacceptable long time execution
if (request->config->apiTimeout > 0)
alarm((unsigned)request->config->apiTimeout);
older = error_handler;
error_handler = &jmpbuf;
doCallPluginApi(request, apiidx, verbidx, context);
error_handler = older;
// cancel timeout and plugin signal handle before next call
alarm(0);
return 1;
}
*/
static void handle(struct afb_req req, const struct api_desc *api, const struct AFB_restapi *verb)
{
AFB_request request;
request.uuid = request.url = "fake";
request.prefix = api->prefix;
request.method = verb->name;
request.context = NULL;
request.restfull = 0;
request.errcode = 0;
request.config = NULL;
request.areq = &req;
switch(verb->session) {
case AFB_SESSION_CREATE:
case AFB_SESSION_RENEW:
/*if (check) new*/
break;
case AFB_SESSION_CLOSE:
case AFB_SESSION_CHECK:
/*check*/
break;
case AFB_SESSION_NONE:
default:
break;
}
verb->callback(&request, NULL);
if (verb->session == AFB_SESSION_CLOSE)
/*del*/;
}
int afb_apis_handle(struct afb_req req, const char *api, size_t lenapi, const char *verb, size_t lenverb)
{
int i, j;
const struct api_desc *a;
const struct AFB_restapi *v;
//fprintf(stderr,"afb_apis_handle prefix:%.*s verb:%.*s\n",(int)lenapi,api,(int)lenverb,verb);
a = apis_array;
for (i = 0 ; i < apis_count ; i++, a++) {
if (a->prefixlen == lenapi && !strncasecmp(a->prefix, api, lenapi)) {
//fprintf(stderr,"afb_apis_handle found prefix:%.*s -> %s\n",(int)lenapi,api,a->prefix);
v = a->plugin->apis;
for (j = 0 ; v->name ; j++, v++) {
if (!strncasecmp(v->name, verb, lenverb) && !v->name[lenverb]) {
//fprintf(stderr,"afb_apis_handle found prefix:%.*s verb:%.*s -> %s/%s\n",(int)lenapi,api,(int)lenverb,verb,a->prefix,v->name);
handle(req, a, v);
return 1;
}
}
break;
}
}
return 0;
}
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