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/*
* Copyright (C) 2015-2019 "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 <stdlib.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <endian.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "afb-api.h"
#include "afb-apiset.h"
#include "afb-api-ws.h"
#include "afb-fdev.h"
#include "afb-socket.h"
#include "afb-stub-ws.h"
#include "verbose.h"
#include "fdev.h"
struct api_ws_server
{
struct afb_apiset *apiset; /* the apiset for calling */
struct fdev *fdev; /* fdev handler */
uint16_t offapi; /* api name of the interface */
char uri[]; /* the uri of the server socket */
};
/******************************************************************************/
/*** C L I E N T ***/
/******************************************************************************/
static struct fdev *reopen_client(void *closure)
{
const char *uri = closure;
return afb_socket_open_fdev(uri, 0);
}
int afb_api_ws_add_client(const char *uri, struct afb_apiset *declare_set, struct afb_apiset *call_set, int strong)
{
struct afb_stub_ws *stubws;
struct fdev *fdev;
const char *api;
/* check the api name */
api = afb_socket_api(uri);
if (api == NULL || !afb_api_is_valid_name(api)) {
ERROR("invalid (too long) ws client uri %s", uri);
errno = EINVAL;
goto error;
}
/* open the socket */
fdev = afb_socket_open_fdev(uri, 0);
if (fdev) {
/* create the client stub */
stubws = afb_stub_ws_create_client(fdev, api, call_set);
if (!stubws) {
ERROR("can't setup client ws service to %s", uri);
fdev_unref(fdev);
} else {
if (afb_stub_ws_client_add(stubws, declare_set) >= 0) {
#if 1
/* it is asserted here that uri is never released */
afb_stub_ws_client_robustify(stubws, reopen_client, (void*)uri, NULL);
#else
/* it is asserted here that uri is released, so use a copy */
afb_stub_ws_client_robustify(stubws, reopen_client, strdup(uri), free);
#endif
return 0;
}
ERROR("can't add the client to the apiset for service %s", uri);
afb_stub_ws_unref(stubws);
}
}
error:
return -!!strong;
}
int afb_api_ws_add_client_strong(const char *uri, struct afb_apiset *declare_set, struct afb_apiset *call_set)
{
return afb_api_ws_add_client(uri, declare_set, call_set, 1);
}
int afb_api_ws_add_client_weak(const char *uri, struct afb_apiset *declare_set, struct afb_apiset *call_set)
{
return afb_api_ws_add_client(uri, declare_set, call_set, 0);
}
/*****************************************************************************/
/*** S E R V E R ***/
/******************************************************************************/
static void api_ws_server_accept(struct api_ws_server *apiws)
{
int fd;
struct sockaddr addr;
socklen_t lenaddr;
struct fdev *fdev;
struct afb_stub_ws *server;
lenaddr = (socklen_t)sizeof addr;
fd = accept(fdev_fd(apiws->fdev), &addr, &lenaddr);
if (fd < 0) {
ERROR("can't accept connection to %s: %m", apiws->uri);
} else {
fdev = afb_fdev_create(fd);
if (!fdev) {
ERROR("can't hold accepted connection to %s: %m", apiws->uri);
close(fd);
} else {
server = afb_stub_ws_create_server(fdev, &apiws->uri[apiws->offapi], apiws->apiset);
if (!server)
ERROR("can't serve accepted connection to %s: %m", apiws->uri);
}
}
}
static int api_ws_server_connect(struct api_ws_server *apiws);
static void api_ws_server_listen_callback(void *closure, uint32_t revents, struct fdev *fdev)
{
struct api_ws_server *apiws = closure;
if ((revents & EPOLLIN) != 0)
api_ws_server_accept(apiws);
if ((revents & EPOLLHUP) != 0)
api_ws_server_connect(apiws);
}
static void api_ws_server_disconnect(struct api_ws_server *apiws)
{
fdev_unref(apiws->fdev);
apiws->fdev = 0;
}
static int api_ws_server_connect(struct api_ws_server *apiws)
{
/* ensure disconnected */
api_ws_server_disconnect(apiws);
/* request the service object name */
apiws->fdev = afb_socket_open_fdev(apiws->uri, 1);
if (!apiws->fdev)
ERROR("can't create socket %s", apiws->uri);
else {
/* listen for service */
fdev_set_events(apiws->fdev, EPOLLIN);
fdev_set_callback(apiws->fdev, api_ws_server_listen_callback, apiws);
return 0;
}
return -1;
}
/* create the service */
int afb_api_ws_add_server(const char *uri, struct afb_apiset *declare_set, struct afb_apiset *call_set)
{
int rc;
const char *api;
struct api_ws_server *apiws;
size_t luri, lapi, extra;
/* check the size */
luri = strlen(uri);
if (luri > 4000) {
ERROR("can't create socket %s", uri);
errno = E2BIG;
return -1;
}
/* check the api name */
api = afb_socket_api(uri);
if (api == NULL || !afb_api_is_valid_name(api)) {
ERROR("invalid api name in ws uri %s", uri);
errno = EINVAL;
goto error;
}
/* check api name */
if (!afb_apiset_lookup(call_set, api, 1)) {
ERROR("Can't provide ws-server for URI %s: API %s doesn't exist", uri, api);
errno = ENOENT;
goto error;
}
/* make the structure */
lapi = strlen(api);
extra = luri == (api - uri) + lapi ? 0 : lapi + 1;
apiws = malloc(sizeof * apiws + 1 + luri + extra);
if (!apiws) {
ERROR("out of memory");
errno = ENOMEM;
goto error;
}
apiws->apiset = afb_apiset_addref(call_set);
apiws->fdev = 0;
strcpy(apiws->uri, uri);
if (!extra)
apiws->offapi = (uint16_t)(api - uri);
else {
apiws->offapi = (uint16_t)(luri + 1);
strcpy(&apiws->uri[apiws->offapi], api);
}
/* connect for serving */
rc = api_ws_server_connect(apiws);
if (rc >= 0)
return 0;
afb_apiset_unref(apiws->apiset);
free(apiws);
error:
return -1;
}
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