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/*
* Copyright (C) 2021 Mikhail Burakov. This file is part of MQhTTp.
*
* MQhTTp 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.
*
* MQhTTp 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 MQhTTp. If not, see <https://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <luajit.h>
#include <mosquitto.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/uio.h>
#include <unistd.h>
#include "logging.h"
#include "server.h"
#define UNCONST(op) ((void*)(uintptr_t)(op))
#define STRIOVEC(op) \
{ .iov_base = UNCONST(op), .iov_len = sizeof(op) - 1 }
#define FLUSHARG(op) \
{ STRIOVEC(op), {.iov_base = NULL, .iov_len = 0}, }
struct Context {
struct mosquitto* mosq;
};
static volatile sig_atomic_t g_shutdown;
static void OnSignal(int num) {
(void)num;
g_shutdown = 1;
}
static bool Flush(int fd, const struct iovec iov[2]) {
// TODO(mburakov): Change to iterative writing.
ssize_t result = writev(fd, iov, 2);
if (result != (ssize_t)(iov[0].iov_len + iov[1].iov_len)) {
Log("Failed to write complete reply (%s)", strerror(errno));
return false;
}
return true;
}
static bool HandleRequest(void* user, int fd, const char* method,
const char* target, const void* body,
size_t body_size) {
struct Context* context = user;
if (strcmp(method, "POST")) {
static const struct iovec kStatus405[2] = FLUSHARG(
"HTTP/1.1 405 Method Not Allowed\r\n"
"Content-Length: 0\r\n"
"\r\n");
return Flush(fd, kStatus405);
}
if (!body_size || !target[1]) {
static const struct iovec kStatus400[2] = FLUSHARG(
"HTTP/1.1 400 Bad Request\r\n"
"Content-Length: 0\r\n"
"\r\n");
return Flush(fd, kStatus400);
}
int mosq_errno = mosquitto_publish(context->mosq, NULL, target + 1,
(int)body_size, body, 0, false);
if (mosq_errno == MOSQ_ERR_SUCCESS) {
static const struct iovec kStatus200[2] = FLUSHARG(
"HTTP/1.1 200 OK\r\n"
"Content-Length: 0\r\n"
"\r\n");
return Flush(fd, kStatus200);
}
char buffer[64];
const char* error = mosquitto_strerror(mosq_errno);
snprintf(buffer, sizeof(buffer),
"HTTP/1.1 500 Internal Server Error\r\n"
"Content-Length: %zu\r\n\r\n",
strlen(error));
const struct iovec iov[2] = {
{.iov_base = buffer, .iov_len = strlen(buffer)},
{.iov_base = UNCONST(error), .iov_len = strlen(error)}};
return Flush(fd, iov);
}
int main(int argc, char* argv[]) {
if (argc < 3) Terminate("Usage: %s <host> <port>", argv[0]);
int port = atoi(argv[2]);
if (0 >= port || port >= 65536)
Terminate("Invalid mosquitto port \"%s\"", argv[2]);
int epfd = epoll_create(1);
if (epfd == -1) Terminate("Failed to create epoll (%s)", strerror(errno));
int result = EXIT_FAILURE;
struct Context context;
struct Server* server = ServerCreate(epfd, HandleRequest, &context);
if (!server) {
Log("Failed to create server");
goto rollback_epoll_create;
}
int mosq_errno = mosquitto_lib_init();
if (mosq_errno != MOSQ_ERR_SUCCESS) {
Log("Failed to initialize mosquitto lib (%s)",
mosquitto_strerror(mosq_errno));
goto rollback_server_create;
}
context.mosq = mosquitto_new(NULL, true, NULL);
if (!context.mosq) {
Log("Failed to create mosquitto (%s)", strerror(errno));
goto rollback_mosquitto_lib_init;
}
mosq_errno = mosquitto_connect(context.mosq, argv[1], port, 60);
if (mosq_errno != MOSQ_ERR_SUCCESS) {
Log("Failed to connect mosquitto (%s)", mosquitto_strerror(mosq_errno));
goto rollback_mosquitto_new;
}
int mosq_sock = mosquitto_socket(context.mosq);
if (mosq_sock == -1) {
Log("Failed to get mosquitto socket");
goto rollback_mosquitto_connect;
}
struct epoll_event ev = {.events = EPOLLIN, .data.fd = mosq_sock};
if (epoll_ctl(epfd, EPOLL_CTL_ADD, mosq_sock, &ev)) {
Log("Failed to add mosquitto to epoll (%s)", strerror(errno));
goto rollback_mosquitto_connect;
}
static const struct sigaction sa = {.sa_handler = OnSignal};
if (sigaction(SIGINT, &sa, NULL) || sigaction(SIGTERM, &sa, NULL)) {
Log("Failed to set up signal handlers (%s)", strerror(errno));
goto rollback_mosquitto_connect;
}
while (!g_shutdown) {
switch (epoll_wait(epfd, &ev, 1, 1000)) {
case -1:
Log("Failed to wait epoll (%s)", strerror(errno));
if (errno != EINTR) goto rollback_mosquitto_connect;
continue;
case 0:
mosq_errno = mosquitto_loop_misc(context.mosq);
if (mosq_errno != MOSQ_ERR_SUCCESS) {
Log("Failed to loop mosquitto (%s)", mosquitto_strerror(mosq_errno));
goto rollback_mosquitto_connect;
}
continue;
default:
break;
}
if (ev.data.fd == mosq_sock) {
mosq_errno = mosquitto_loop_read(context.mosq, 1);
if (mosq_errno != MOSQ_ERR_SUCCESS) {
Log("Failed to read mosquitto (%s)", mosquitto_strerror(mosq_errno));
goto rollback_mosquitto_connect;
}
continue;
}
if (!ServerMaybeHandle(server, ev.data.fd))
Terminate("Stray socket in epoll");
}
result = EXIT_SUCCESS;
rollback_mosquitto_connect:
mosquitto_disconnect(context.mosq);
rollback_mosquitto_new:
mosquitto_destroy(context.mosq);
rollback_mosquitto_lib_init:
mosquitto_lib_cleanup();
rollback_server_create:
ServerDestroy(server);
rollback_epoll_create:
close(epfd);
return result;
}
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