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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* Copyright (C) 2018 - David Oberhollenzer
*
* This program 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.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include <stdio.h>
#include "backend.h"
#include "proto.h"
#include "util.h"
#define SYSLOG_SOCKET "/dev/log"
#define GPL_URL "https://gnu.org/licenses/gpl.html"
static const struct option long_opts[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
{ "rotate-replace", no_argument, NULL, 'r' },
{ "max-size", required_argument, NULL, 'm' },
{ NULL, 0, NULL, 0 },
};
const char *short_opts = "hVrm:";
const char *version_string =
"usyslogd (pygos init) " PACKAGE_VERSION "\n"
"Copyright (C) 2018 David Oberhollenzer\n\n"
"License GPLv3+: GNU GPL version 3 or later <" GPL_URL ">.\n"
"This is free software: you are free to change and redistribute it.\n"
"There is NO WARRANTY, to the extent permitted by law.\n";
const char *usage_string =
"Usage: usyslogd [OPTIONS..]\n\n"
"The following options are supported:\n"
" -h, --help Print this help text and exit\n"
" -V, --version Print version information and exit\n"
" -r, --rotate-replace Replace old log files when doing log rotation.\n"
" -m, --max-size <size> Automatically rotate log files bigger than this.\n";
static volatile sig_atomic_t syslog_run = 1;
static volatile sig_atomic_t syslog_rotate = 0;
static int log_flags = 0;
static size_t max_size = 0;
static void sighandler(int signo)
{
switch (signo) {
case SIGINT:
case SIGTERM:
syslog_run = 0;
break;
case SIGHUP:
syslog_rotate = 1;
break;
default:
break;
}
}
static void signal_setup(void)
{
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = sighandler;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigaction(SIGHUP, &act, NULL);
}
static int handle_data(int fd)
{
char buffer[2048];
syslog_msg_t msg;
ssize_t ret;
memset(buffer, 0, sizeof(buffer));
ret = read(fd, buffer, sizeof(buffer));
if (ret <= 0)
return -1;
if (syslog_msg_parse(&msg, buffer))
return -1;
return logmgr->write(logmgr, &msg);
}
static void process_options(int argc, char **argv)
{
char *end;
int i;
for (;;) {
i = getopt_long(argc, argv, short_opts, long_opts, NULL);
if (i == -1)
break;
switch (i) {
case 'r':
log_flags |= LOG_ROTATE_OVERWRITE;
break;
case 'm':
log_flags |= LOG_ROTATE_SIZE_LIMIT;
max_size = strtol(optarg, &end, 10);
if (max_size == 0 || *end != '\0') {
fputs("Numeric argument > 0 expected for -m\n",
stderr);
goto fail;
}
break;
case 'h':
fputs(usage_string, stdout);
exit(EXIT_SUCCESS);
case 'V':
fputs(version_string, stdout);
exit(EXIT_SUCCESS);
default:
goto fail;
}
}
return;
fail:
fputs("Try `usyslogd --help' for more information\n", stderr);
exit(EXIT_FAILURE);
}
int main(int argc, char **argv)
{
int sfd, status = EXIT_FAILURE;
process_options(argc, argv);
signal_setup();
sfd = mksock(SYSLOG_SOCKET, SOCK_FLAG_EVERYONE | SOCK_FLAG_DGRAM);
if (sfd < 0)
return EXIT_FAILURE;
if (logmgr->init(logmgr, log_flags, max_size))
goto out;
while (syslog_run) {
if (syslog_rotate) {
logmgr->rotate(logmgr);
syslog_rotate = 0;
}
handle_data(sfd);
}
status = EXIT_SUCCESS;
out:
logmgr->cleanup(logmgr);
if (sfd > 0)
close(sfd);
unlink(SYSLOG_SOCKET);
return status;
}
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