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/*
* Papo IRC Server
* Copyright (C) 2021 Johnny Richard
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "log.h"
#include "server.h"
#include <assert.h>
#include <sys/epoll.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <errno.h>
#define BUFFER_SIZE 1024
#define EXIT_COMMAND "exit"
#define EMPTY_CCLIENT_SPOT -1
static void server_handle_client_data(server_t *server, struct epoll_event *event);
static void server_handle_server_data(server_t *server, struct epoll_event *event);
void
server_init(server_t *server, uint32_t port)
{
assert(server != NULL);
memset(server, 0, sizeof(server));
int server_fd = socket(AF_INET, SOCK_STREAM, 0);
if (server_fd == -1) {
log_fatal("unable to create a socket: %s", strerror(errno));
exit(EXIT_FAILURE);
}
server->fd = server_fd;
struct sockaddr_in server_addr;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port);
int opt_val = 1;
setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt_val, sizeof(opt_val));
if (bind(server_fd, (struct sockaddr *) &server_addr, sizeof(server_addr)) == -1) {
log_fatal("could not bind: %s", strerror(errno));
close(server_fd);
exit(EXIT_FAILURE);
}
if (listen(server_fd, SOMAXCONN) == -1) {
log_fatal("could not listen: %s", strerror(errno));
close(server_fd);
exit(EXIT_FAILURE);
}
memset(server->connected_clients, EMPTY_CCLIENT_SPOT, sizeof(int) * MAXEVENTS);
server->epoll_fd = epoll_create1(0);
if (server->epoll_fd == -1) {
log_fatal("faild to create epoll: %s", strerror(errno));
exit(EXIT_FAILURE);
}
struct epoll_event event;
event.events = EPOLLIN;
event.data.fd = server->fd;
if (epoll_ctl(server->epoll_fd, EPOLL_CTL_ADD, server->fd, &event) == -1) {
log_fatal("could not add server to epoll: %s", strerror(errno));
exit(EXIT_FAILURE);
}
log_debug("server listening on port (%d)", port);
}
void
server_run(server_t *server)
{
server->running = true;
while (server->running) {
int event_count = epoll_wait(server->epoll_fd, server->events, MAXEVENTS, 10000);
if (event_count == -1) {
log_error("could not wait for epoll events: %s", strerror(errno));
continue;
}
if (event_count == 0) {
log_trace("epoll_wait timeout");
continue;
}
for (int i = 0; i < event_count; ++i) {
struct epoll_event event = server->events[i];
if (event.data.fd == server->fd) {
server_handle_server_data(server, &event);
} else {
server_handle_client_data(server, &event);
}
}
}
close(server->epoll_fd);
close(server->fd);
exit(EXIT_SUCCESS);
}
static void
server_handle_server_data(server_t *server, struct epoll_event *event)
{
struct sockaddr_in client;
socklen_t client_len = sizeof(client);
int client_fd = accept(server->fd, (struct sockaddr *) &client, &client_len);
if (client_fd == -1) {
log_error("could not accept connection: %s", strerror(errno));
close(server->fd);
exit(EXIT_FAILURE);
}
struct epoll_event client_event;
client_event.events = EPOLLIN;
client_event.data.fd = client_fd;
if (epoll_ctl(server->epoll_fd, EPOLL_CTL_ADD, client_fd, &client_event) == -1) {
log_error("could not add server to epoll: %s", strerror(errno));
exit(EXIT_FAILURE);
}
int j = 0;
while (server->connected_clients[j] != EMPTY_CCLIENT_SPOT && j < MAXEVENTS) {
j++;
}
if (j < MAXEVENTS) {
server->connected_clients[j] = client_fd;
} else {
log_warn("max number of connection has been reached");
}
}
static void
server_handle_client_data(server_t *server, struct epoll_event *event)
{
int client_fd = event->data.fd;
if (event->events & EPOLLHUP) {
for (int j = 0; j < MAXEVENTS; ++j) {
if (server->connected_clients[j] == client_fd) {
server->connected_clients[j] = EMPTY_CCLIENT_SPOT;
break;
}
}
return;
}
char client_buf[BUFFER_SIZE];
memset(client_buf, 0, BUFFER_SIZE);
if (recv(client_fd, client_buf, BUFFER_SIZE, 0) == -1) {
log_error("could not read data from client: %s", strerror(errno));
return;
}
if (!strncasecmp(client_buf, EXIT_COMMAND, strlen(EXIT_COMMAND) - 1)) {
log_debug("exiting program. bye bye!");
server->running = false;
}
for (int j = 0; j < MAXEVENTS; ++j) {
if (server->connected_clients[j] == EMPTY_CCLIENT_SPOT) {
continue;
}
char message[BUFFER_SIZE];
memset(message, 0, sizeof(char) * BUFFER_SIZE);
sprintf(message, "client_%d :%s", client_fd, client_buf);
if (send(server->connected_clients[j], message, BUFFER_SIZE, 0) == -1) {
log_error("could not send data to client: %s", strerror(errno));
continue;
}
}
}
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