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/*
* Copyright (C) 2016 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* 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.
*/
#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 <afb/afb-plugin.h>
#include <afb/afb-req-itf.h>
#include <afb/afb-evmgr-itf.h>
#include "session.h"
#include "afb-common.h"
#include "afb-context.h"
#include "afb-apis.h"
#include "afb-api-so.h"
#include "afb-sig-handler.h"
#include "verbose.h"
struct api_so_desc {
struct AFB_plugin *plugin; /* descriptor */
size_t apilength;
void *handle; /* context of dlopen */
struct AFB_interface interface; /* interface */
};
static int api_timeout = 15;
static const char plugin_register_function[] = "pluginAfbV1Entry";
static void afb_api_so_evmgr_push(struct api_so_desc *desc, const char *name, struct json_object *object)
{
size_t length;
char *event;
assert(desc->plugin != NULL);
length = strlen(name);
event = alloca(length + 2 + desc->apilength);
memcpy(event, desc->plugin->v1.prefix, desc->apilength);
event[desc->apilength] = '/';
memcpy(event + desc->apilength + 1, name, length + 1);
ctxClientEventSend(NULL, event, object);
}
static const struct afb_evmgr_itf evmgr_itf = {
.push = (void*)afb_api_so_evmgr_push
};
static struct afb_evmgr afb_api_so_get_evmgr(struct api_so_desc *desc)
{
return (struct afb_evmgr){ .itf = &evmgr_itf, .closure = desc };
}
static const struct afb_daemon_itf daemon_itf = {
.get_evmgr = (void*)afb_api_so_get_evmgr,
.get_event_loop = (void*)afb_common_get_event_loop,
.get_user_bus = (void*)afb_common_get_user_bus,
.get_system_bus = (void*)afb_common_get_system_bus
};
struct monitoring {
struct afb_req req;
void (*action)(struct afb_req);
};
static void monitored_call(int signum, struct monitoring *data)
{
if (signum != 0)
afb_req_fail_f(data->req, "aborted", "signal %s(%d) caught", strsignal(signum), signum);
else
data->action(data->req);
}
static void call_check(struct afb_req req, struct afb_context *context, const struct AFB_verb_desc_v1 *verb)
{
struct monitoring data;
int stag = (int)(verb->session & AFB_SESSION_MASK);
if (stag != AFB_SESSION_NONE) {
if (!afb_context_check(context)) {
afb_context_close(context);
afb_req_fail(req, "failed", "invalid token's identity");
return;
}
}
if ((stag & AFB_SESSION_CREATE) != 0) {
if (!afb_context_create(context)) {
afb_context_close(context);
afb_req_fail(req, "failed", "invalid creation state");
return;
}
}
if ((stag & (AFB_SESSION_CREATE | AFB_SESSION_RENEW)) != 0)
afb_context_refresh(context);
if ((stag & AFB_SESSION_CLOSE) != 0)
afb_context_close(context);
data.req = req;
data.action = verb->callback;
afb_sig_monitor((void*)monitored_call, &data, api_timeout);
}
static void call(struct api_so_desc *desc, struct afb_req req, struct afb_context *context, const char *verb, size_t lenverb)
{
const struct AFB_verb_desc_v1 *v;
v = desc->plugin->v1.verbs;
while (v->name && (strncasecmp(v->name, verb, lenverb) || v->name[lenverb]))
v++;
if (v->name)
call_check(req, context, v);
else
afb_req_fail_f(req, "unknown-verb", "verb %.*s unknown within api %s", (int)lenverb, verb, desc->plugin->v1.prefix);
}
int afb_api_so_add_plugin(const char *path)
{
struct api_so_desc *desc;
struct AFB_plugin *(*pluginAfbV1RegisterFct) (const struct AFB_interface *interface);
desc = calloc(1, sizeof *desc);
if (desc == NULL) {
ERROR("out of memory");
goto error;
}
// This is a loadable library let's check if it's a plugin
desc->handle = dlopen(path, RTLD_NOW | RTLD_LOCAL);
if (desc->handle == NULL) {
ERROR("plugin [%s] not loadable", path);
goto error2;
}
/* retrieves the register function */
pluginAfbV1RegisterFct = dlsym(desc->handle, plugin_register_function);
if (!pluginAfbV1RegisterFct) {
ERROR("plugin [%s] is not an AFB plugin", path);
goto error3;
}
INFO("plugin [%s] is a valid AFB plugin", path);
/* init the interface */
desc->interface.verbosity = 0;
desc->interface.mode = AFB_MODE_LOCAL;
desc->interface.daemon.itf = &daemon_itf;
desc->interface.daemon.closure = desc;
/* init the plugin */
desc->plugin = pluginAfbV1RegisterFct(&desc->interface);
if (desc->plugin == NULL) {
ERROR("plugin [%s] register function failed. continuing...", path);
goto error3;
}
/* check the returned structure */
if (desc->plugin->type != AFB_PLUGIN_VERSION_1) {
ERROR("plugin [%s] invalid type %d...", path, desc->plugin->type);
goto error3;
}
if (desc->plugin->v1.prefix == NULL || *desc->plugin->v1.prefix == 0) {
ERROR("plugin [%s] bad prefix...", path);
goto error3;
}
if (desc->plugin->v1.info == NULL || *desc->plugin->v1.info == 0) {
ERROR("plugin [%s] bad description...", path);
goto error3;
}
if (desc->plugin->v1.verbs == NULL) {
ERROR("plugin [%s] no APIs...", path);
goto error3;
}
/* records the plugin */
desc->apilength = strlen(desc->plugin->v1.prefix);
if (afb_apis_add(desc->plugin->v1.prefix, (struct afb_api){
.closure = desc,
.call = (void*)call}) < 0) {
ERROR("plugin [%s] can't be registered...", path);
goto error3;
}
NOTICE("plugin %s loaded with API prefix %s", path, desc->plugin->v1.prefix);
return 0;
error3:
dlclose(desc->handle);
error2:
free(desc);
error:
return -1;
}
static int adddirs(char path[PATH_MAX], size_t end)
{
DIR *dir;
struct dirent ent, *result;
size_t len;
/* open the DIR now */
dir = opendir(path);
if (dir == NULL) {
ERROR("can't scan plugin directory %s, %m", path);
return -1;
}
INFO("Scanning dir=[%s] for plugins", 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) {
ERROR("path too long while scanning plugins for %s", 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;
}
adddirs(path, end+len);;
} else if (ent.d_type == DT_REG) {
/* case of files */
if (!strstr(ent.d_name, ".so"))
continue;
afb_api_so_add_plugin(path);
}
}
closedir(dir);
return 0;
}
int afb_api_so_add_directory(const char *path)
{
size_t length;
char buffer[PATH_MAX];
length = strlen(path);
if (length >= sizeof(buffer)) {
ERROR("path too long %lu [%.99s...]", (unsigned long)length, path);
return -1;
}
memcpy(buffer, path, length + 1);
return adddirs(buffer, length);
}
int afb_api_so_add_path(const char *path)
{
struct stat st;
int rc;
rc = stat(path, &st);
if (rc < 0)
ERROR("Invalid plugin path [%s]: %m", path);
else if (S_ISDIR(st.st_mode))
rc = afb_api_so_add_directory(path);
else if (strstr(path, ".so"))
rc = afb_api_so_add_plugin(path);
else
INFO("not a plugin [%s], skipped", path);
return rc;
}
int afb_api_so_add_pathset(const char *pathset)
{
static char sep[] = ":";
char *ps, *p;
ps = strdupa(pathset);
for (;;) {
p = strsep(&ps, sep);
if (!p)
return 0;
afb_api_so_add_path(p);
};
}
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