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/*-
* Copyright (c) 2026, Mr. Goblin
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "cliflags.h"
#define BTASKTD_HELP_STR \
"Copyright (c) 2026 Mr. Goblin\n" \
"btasktd - task tracking TCP-server\n" \
"Usage: btasktd [-Vh] [-p port] [-u users]\n" \
"For more info read program's man page\n"
#define BTASKTD_VERSION_STR \
"0.0.0"
#ifndef BTASKTD_QUEUE_LEN
# define BTASKTD_QUEUE_LEN 16
#endif
static void
fprint_help(FILE *f)
{
fputs(BTASKTD_HELP_STR, f);
}
static void
set_nonblock(int fd)
{
int fflags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, fflags|O_NONBLOCK);
}
int
main(int argc, char **argv)
{
int server_fd, opt = 1, res, port, passed_flags = 1, users_cnt;
int *users = NULL;
struct sockaddr_in addr = {0};
struct int_flag_val int_res;
struct bool_flag_val show_ver, show_help;
show_ver = extract_bool_flag('V', argc, argv);
if (fvr_ok == show_ver.code && show_ver.data) {
printf("btasktd version %s\n", BTASKTD_VERSION_STR);
return 0;
}
show_help = extract_bool_flag('h', argc, argv);
if (show_help.code == fvr_ok && show_help.data) {
fprint_help(stdout);
return 0;
}
int_res = extract_int_flag('p', argc, argv);
switch (int_res.code) {
case fvr_not_found:
# ifdef BTASKTD_DEFAULT_PORT
port = BTASKTD_DEFAULT_PORT;
# else
fputs("No port specified!\n", stderr);
passed_flags = 0;
# endif
break;
case fvr_ok:
port = int_res.data;
if (port > 0)
break;
/* fallthrough */
case fvr_invalid:
fputs("Invalid port!\n", stderr);
return 1;
break;
}
int_res = extract_int_flag('u', argc, argv);
switch (int_res.code) {
case fvr_not_found:
# ifdef BTASKTD_DEFAULT_USERS_CNT
users_cnt = BTASKTD_DEFAULT_USERS_CNT;
# else
fputs("No users count specified!\n", stderr);
passed_flags = 0;
# endif
break;
case fvr_ok:
users_cnt = int_res.data;
if (users_cnt > 0)
break;
/* fallthrough */
case fvr_invalid:
fputs("Invalid users count!\n", stderr);
return 1;
break;
}
if (!passed_flags) {
fputs("-\n", stderr);
fprint_help(stderr);
return 1;
}
users = (int*)malloc(users_cnt * sizeof(int));
if (NULL == users) {
fputs("No memory!\n", stderr);
return 1;
}
server_fd = socket(AF_INET, SOCK_STREAM, 0);
if (server_fd < 0) {
free(users);
perror("socket");
return 1;
}
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
res = bind(server_fd, (struct sockaddr*)&addr, sizeof(addr));
if (0 != res) {
close(server_fd);
free(users);
perror("bind");
return 1;
}
res = listen(server_fd, BTASKTD_QUEUE_LEN);
if (0 != res) {
close(server_fd);
free(users);
perror("listen");
return 1;
}
res = setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR,
&opt, sizeof(opt));
if (0 != res) {
close(server_fd);
free(users);
perror("setsockopt");
return 1;
}
set_nonblock(server_fd);
printf("btaskt server btasktd started on port %d\n", port);
/* main loop here */
printf("btaskt server btasktd stopped\n");
close(server_fd);
free(users);
return 0;
}
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