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/*
* Copyright (C) 2016, 2017 "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
#define NO_BINDING_VERBOSE_MACRO
#include <string.h>
#include <dlfcn.h>
#include <assert.h>
#include <afb/afb-binding.h>
#include "afb-apis.h"
#include "afb-svc.h"
#include "afb-evt.h"
#include "afb-common.h"
#include "afb-context.h"
#include "afb-api-so.h"
#include "afb-thread.h"
#include "verbose.h"
/*
* names of symbols
*/
static const char afb_api_so_v2_descriptor[] = "afbBindingV2";
/*
* Description of a binding
*/
struct api_so_v2 {
struct afb_binding_v2 *binding; /* descriptor */
size_t apilength; /* length of the API name */
void *handle; /* context of dlopen */
struct afb_svc *service; /* handler for service started */
struct afb_binding_interface interface; /* interface for the binding */
};
static struct afb_event afb_api_so_event_make_cb(void *closure, const char *name);
static int afb_api_so_event_broadcast_cb(void *closure, const char *name, struct json_object *object);
static void afb_api_so_vverbose_cb(void *closure, int level, const char *file, int line, const char *fmt, va_list args);
static int afb_api_so_rootdir_get_fd(void *closure);
static int afb_api_so_rootdir_open_locale(void *closure, const char *filename, int flags, const char *locale);
static const struct afb_daemon_itf daemon_itf = {
.event_broadcast = afb_api_so_event_broadcast_cb,
.get_event_loop = afb_common_get_event_loop,
.get_user_bus = afb_common_get_user_bus,
.get_system_bus = afb_common_get_system_bus,
.vverbose = afb_api_so_vverbose_cb,
.event_make = afb_api_so_event_make_cb,
.rootdir_get_fd = afb_api_so_rootdir_get_fd,
.rootdir_open_locale = afb_api_so_rootdir_open_locale
};
static struct afb_event afb_api_so_event_make_cb(void *closure, const char *name)
{
size_t length;
char *event;
struct api_so_v2 *desc = closure;
/* makes the event name */
assert(desc->binding != NULL);
length = strlen(name);
event = alloca(length + 2 + desc->apilength);
memcpy(event, desc->binding->api, desc->apilength);
event[desc->apilength] = '/';
memcpy(event + desc->apilength + 1, name, length + 1);
/* crate the event */
return afb_evt_create_event(event);
}
static int afb_api_so_event_broadcast_cb(void *closure, const char *name, struct json_object *object)
{
size_t length;
char *event;
struct api_so_v2 *desc = closure;
/* makes the event name */
assert(desc->binding != NULL);
length = strlen(name);
event = alloca(length + 2 + desc->apilength);
memcpy(event, desc->binding->api, desc->apilength);
event[desc->apilength] = '/';
memcpy(event + desc->apilength + 1, name, length + 1);
return afb_evt_broadcast(event, object);
}
static void afb_api_so_vverbose_cb(void *closure, int level, const char *file, int line, const char *fmt, va_list args)
{
char *p;
struct api_so_v2 *desc = closure;
if (vasprintf(&p, fmt, args) < 0)
vverbose(level, file, line, fmt, args);
else {
verbose(level, file, line, "%s {binding %s}", p, desc->binding->api);
free(p);
}
}
static int afb_api_so_rootdir_get_fd(void *closure)
{
return afb_common_rootdir_get_fd();
}
static int afb_api_so_rootdir_open_locale(void *closure, const char *filename, int flags, const char *locale)
{
return afb_common_rootdir_open_locale(filename, flags, locale);
}
static int call_check(struct afb_req req, struct afb_context *context, const struct afb_verb_v2 *verb)
{
int stag = (int)verb->session;
if ((stag & (AFB_SESSION_CREATE|AFB_SESSION_CLOSE|AFB_SESSION_RENEW|AFB_SESSION_CHECK|AFB_SESSION_LOA_EQ)) != 0) {
if (!afb_context_check(context)) {
afb_context_close(context);
afb_req_fail(req, "failed", "invalid token's identity");
return 0;
}
}
if ((stag & AFB_SESSION_CREATE) != 0) {
if (afb_context_check_loa(context, 1)) {
afb_req_fail(req, "failed", "invalid creation state");
return 0;
}
afb_context_change_loa(context, 1);
afb_context_refresh(context);
}
if ((stag & (AFB_SESSION_CREATE | AFB_SESSION_RENEW)) != 0)
afb_context_refresh(context);
if ((stag & AFB_SESSION_CLOSE) != 0) {
afb_context_change_loa(context, 0);
afb_context_close(context);
}
if ((stag & AFB_SESSION_LOA_GE) != 0) {
int loa = (stag >> AFB_SESSION_LOA_SHIFT) & AFB_SESSION_LOA_MASK;
if (!afb_context_check_loa(context, loa)) {
afb_req_fail(req, "failed", "invalid LOA");
return 0;
}
}
if ((stag & AFB_SESSION_LOA_LE) != 0) {
int loa = (stag >> AFB_SESSION_LOA_SHIFT) & AFB_SESSION_LOA_MASK;
if (afb_context_check_loa(context, loa + 1)) {
afb_req_fail(req, "failed", "invalid LOA");
return 0;
}
}
return 1;
}
static void call_cb(void *closure, struct afb_req req, struct afb_context *context, const char *strverb)
{
const struct afb_verb_v2 *verb;
struct api_so_v2 *desc = closure;
verb = desc->binding->verbs;
while (verb->verb && strcasecmp(verb->verb, strverb))
verb++;
if (!verb->verb)
afb_req_fail_f(req, "unknown-verb", "verb %s unknown within api %s", strverb, desc->binding->api);
else if (call_check(req, context, verb)) {
afb_thread_req_call(req, verb->callback, afb_api_so_timeout, desc);
}
}
static int service_start_cb(void *closure, int share_session, int onneed)
{
int (*start)(const struct afb_binding_interface *interface, struct afb_service service);
void (*onevent)(const char *event, struct json_object *object);
struct api_so_v2 *desc = closure;
/* check state */
if (desc->service != NULL) {
/* not an error when onneed */
if (onneed != 0)
return 0;
/* already started: it is an error */
ERROR("Service %s already started", desc->binding->api);
return -1;
}
/* get the initialisation */
start = desc->binding->start;
if (start == NULL) {
/* not an error when onneed */
if (onneed != 0)
return 0;
/* no initialisation method */
ERROR("Binding %s is not a service", desc->binding->api);
return -1;
}
/* get the event handler if any */
onevent = desc->binding->onevent;
desc->service = afb_svc_create_v2(share_session, onevent, start, &desc->interface);
if (desc->service == NULL) {
/* starting error */
ERROR("Starting service %s failed", desc->binding->api);
return -1;
}
return 0;
}
int afb_api_so_v2_add(const char *path, void *handle)
{
int rc;
struct api_so_v2 *desc;
struct afb_binding_v2 *binding;
/* retrieves the register function */
binding = dlsym(handle, afb_api_so_v2_descriptor);
if (!binding)
return 0;
INFO("binding [%s] looks like an AFB binding V2", path);
/* basic checks */
if (binding->api == NULL || *binding->api == 0) {
ERROR("binding [%s] bad api name...", path);
goto error;
}
if (!afb_apis_is_valid_api_name(binding->api)) {
ERROR("binding [%s] invalid api name...", path);
goto error;
}
if (binding->specification == NULL || *binding->specification == 0) {
ERROR("binding [%s] bad specification...", path);
goto error;
}
if (binding->verbs == NULL) {
ERROR("binding [%s] no verbs...", path);
goto error;
}
/* allocates the description */
desc = calloc(1, sizeof *desc);
if (desc == NULL) {
ERROR("out of memory");
goto error;
}
desc->binding = binding;
desc->handle = handle;
/* init the interface */
desc->interface.verbosity = verbosity;
desc->interface.mode = AFB_MODE_LOCAL;
desc->interface.daemon.itf = &daemon_itf;
desc->interface.daemon.closure = desc;
/* for log purpose, a fake binding is needed here */
/* init the binding */
if (binding->init) {
NOTICE("binding %s [%s] calling init function", binding->api, path);
rc = binding->init(&desc->interface);
if (rc < 0) {
ERROR("binding %s [%s] initialisation function failed...", binding->api, path);
goto error2;
}
}
/* records the binding */
desc->apilength = strlen(binding->api);
if (afb_apis_add(binding->api, (struct afb_api){
.closure = desc,
.call = call_cb,
.service_start = service_start_cb }) < 0) {
ERROR("binding [%s] can't be registered...", path);
goto error2;
}
NOTICE("binding %s loaded with API prefix %s", path, binding->api);
return 1;
error2:
free(desc);
error:
return -1;
}
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