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/*
* Copyright (C) 2015, 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_PLUGIN_VERBOSE_MACRO
#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 <systemd/sd-event.h>
#include "afb-api.h"
#include "afb-apiset.h"
#include "afb-common.h"
#include "afb-stub-ws.h"
#include "verbose.h"
#include "sd-fds.h"
struct api_ws
{
char *path; /* path of the object for the API */
char *api; /* api name of the interface */
int fd; /* file descriptor */
sd_event_source *listensrc; /**< systemd source for server socket */
struct afb_apiset *apiset;
};
/******************************************************************************/
/*
* create a structure api_ws not connected to the 'path'.
*/
static struct api_ws *api_ws_make(const char *path)
{
struct api_ws *api;
size_t length;
/* allocates the structure */
length = strlen(path);
api = calloc(1, sizeof *api + 1 + length);
if (api == NULL) {
errno = ENOMEM;
goto error;
}
/* path is copied after the struct */
api->path = (char*)(api+1);
memcpy(api->path, path, length + 1);
/* api name is at the end of the path */
while (length && path[length - 1] != '/' && path[length - 1] != ':')
length = length - 1;
api->api = &api->path[length];
if (api->api == NULL || !afb_api_is_valid_name(api->api)) {
errno = EINVAL;
goto error2;
}
api->fd = -1;
return api;
error2:
free(api);
error:
return NULL;
}
static int api_ws_socket_unix(const char *path, int server)
{
int fd, rc;
struct sockaddr_un addr;
size_t length;
length = strlen(path);
if (length >= 108) {
errno = ENAMETOOLONG;
return -1;
}
if (server && path[0] != '@')
unlink(path);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return fd;
memset(&addr, 0, sizeof addr);
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, path);
if (addr.sun_path[0] == '@')
addr.sun_path[0] = 0; /* implement abstract sockets */
if (server) {
rc = bind(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
} else {
rc = connect(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
}
if (rc < 0) {
close(fd);
return rc;
}
return fd;
}
static int api_ws_socket_inet(const char *path, int server)
{
int rc, fd;
const char *service, *host, *api;
struct addrinfo hint, *rai, *iai;
/* scan the uri */
api = strrchr(path, '/');
service = strrchr(path, ':');
if (api == NULL || service == NULL || api < service) {
errno = EINVAL;
return -1;
}
host = strndupa(path, service++ - path);
service = strndupa(service, api - service);
/* get addr */
memset(&hint, 0, sizeof hint);
hint.ai_family = AF_INET;
hint.ai_socktype = SOCK_STREAM;
rc = getaddrinfo(host, service, &hint, &rai);
if (rc != 0) {
errno = EINVAL;
return -1;
}
/* get the socket */
iai = rai;
while (iai != NULL) {
fd = socket(iai->ai_family, iai->ai_socktype, iai->ai_protocol);
if (fd >= 0) {
if (server) {
rc = bind(fd, iai->ai_addr, iai->ai_addrlen);
} else {
rc = connect(fd, iai->ai_addr, iai->ai_addrlen);
}
if (rc == 0) {
freeaddrinfo(rai);
return fd;
}
close(fd);
}
iai = iai->ai_next;
}
freeaddrinfo(rai);
return -1;
}
static int api_ws_socket(const char *path, int server)
{
int fd, rc;
/* check for systemd socket */
if (0 == strncmp(path, "sd:", 3))
fd = sd_fds_for(path + 3);
else {
/* check for unix socket */
if (0 == strncmp(path, "unix:", 5))
/* unix socket */
fd = api_ws_socket_unix(path + 5, server);
else
/* inet socket */
fd = api_ws_socket_inet(path, server);
if (fd >= 0 && server) {
rc = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &rc, sizeof rc);
rc = listen(fd, 5);
}
}
/* configure the socket */
if (fd >= 0) {
fcntl(fd, F_SETFD, FD_CLOEXEC);
fcntl(fd, F_SETFL, O_NONBLOCK);
}
return fd;
}
/**********************************************************************************/
int afb_api_ws_add_client(const char *path, struct afb_apiset *apiset)
{
struct api_ws *apiws;
struct afb_stub_ws *stubws;
/* create the ws client api */
apiws = api_ws_make(path);
if (apiws == NULL)
goto error;
/* connect to the service */
apiws->fd = api_ws_socket(apiws->path, 0);
if (apiws->fd < 0) {
ERROR("can't connect to ws service %s", apiws->path);
goto error2;
}
stubws = afb_stub_ws_create_client(apiws->fd, apiws->api, apiset);
if (!stubws) {
ERROR("can't setup client ws service to %s", apiws->path);
goto error3;
}
if (afb_stub_ws_client_add(stubws, apiset) < 0) {
ERROR("can't add the client to the apiset for service %s", apiws->path);
goto error4;
}
free(apiws);
return 0;
error4:
afb_stub_ws_unref(stubws);
error3:
close(apiws->fd);
error2:
free(apiws);
error:
return -1;
}
static int api_ws_server_accept_client(struct api_ws *apiws, int fd)
{
return -!afb_stub_ws_create_server(fd, apiws->api, apiws->apiset);
}
static void api_ws_server_accept(struct api_ws *apiws)
{
int rc, fd;
struct sockaddr addr;
socklen_t lenaddr;
lenaddr = (socklen_t)sizeof addr;
fd = accept(apiws->fd, &addr, &lenaddr);
if (fd >= 0) {
rc = api_ws_server_accept_client(apiws, fd);
if (rc >= 0)
return;
close(fd);
}
}
static int api_ws_server_connect(struct api_ws *apiws);
static int api_ws_server_listen_callback(sd_event_source *src, int fd, uint32_t revents, void *closure)
{
struct api_ws *apiws = closure;
if ((revents & EPOLLIN) != 0)
api_ws_server_accept(apiws);
if ((revents & EPOLLHUP) != 0)
api_ws_server_connect(apiws);
return 0;
}
static void api_ws_server_disconnect(struct api_ws *apiws)
{
if (apiws->listensrc != NULL) {
sd_event_source_unref(apiws->listensrc);
apiws->listensrc = NULL;
}
if (apiws->fd >= 0) {
close(apiws->fd);
apiws->fd = -1;
}
}
static int api_ws_server_connect(struct api_ws *apiws)
{
int rc;
/* ensure disconnected */
api_ws_server_disconnect(apiws);
/* request the service object name */
apiws->fd = api_ws_socket(apiws->path, 1);
if (apiws->fd < 0)
ERROR("can't create socket %s", apiws->path);
else {
/* listen for service */
rc = sd_event_add_io(afb_common_get_event_loop(),
&apiws->listensrc, apiws->fd, EPOLLIN,
api_ws_server_listen_callback, apiws);
if (rc >= 0)
return 0;
close(apiws->fd);
errno = -rc;
ERROR("can't add ws object %s", apiws->path);
}
return -1;
}
/* create the service */
int afb_api_ws_add_server(const char *path, struct afb_apiset *apiset)
{
int rc;
struct api_ws *apiws;
/* creates the ws api object */
apiws = api_ws_make(path);
if (apiws == NULL)
goto error;
/* connect for serving */
rc = api_ws_server_connect(apiws);
if (rc < 0)
goto error2;
apiws->apiset = afb_apiset_addref(apiset);
return 0;
error2:
free(apiws);
error:
return -1;
}
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