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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 <errno.h>
#include <stdio.h>
#include "logfile.h"
#include "proto.h"
#include "util.h"
#define SYSLOG_SOCKET "/dev/log"
#define SYSLOG_PATH "/var/log"
static volatile sig_atomic_t syslog_run = 1;
static logfile_t *logfiles = NULL;
static const enum_map_t facilities[] = {
{ "kernel.log", 0 },
{ "user.log", 1 },
{ "mail.log", 2 },
{ "daemon.log", 3 },
{ "auth.log", 4 },
{ "syslog.log", 5 },
{ "lpr.log", 6 },
{ "news.log", 7 },
{ "uucp.log", 8 },
{ "clock.log", 9 },
{ "authpriv.log", 10 },
{ "ftp.log", 11 },
{ "ntp.log", 12 },
{ "audit.log", 13 },
{ "alert.log", 14 },
{ "cron.log", 15 },
{ "local0.log", 16 },
{ "local1.log", 17 },
{ "local2.log", 18 },
{ "local3.log", 19 },
{ "local4.log", 20 },
{ "local5.log", 21 },
{ "local6.log", 22 },
{ "local7.log", 23 },
{ NULL, 0 },
};
static const enum_map_t levels[] = {
{ "emergency", 0 },
{ "alert", 1 },
{ "critical", 2 },
{ "error", 3 },
{ "warning", 4 },
{ "notice", 5 },
{ "info", 6 },
{ "debug", 7 },
{ NULL, 0 },
};
static int directory_setup(void)
{
if (mkdir(SYSLOG_PATH, 0755)) {
if (errno != EEXIST) {
perror("mkdir " SYSLOG_PATH);
return -1;
}
}
if (chdir(SYSLOG_PATH)) {
perror("cd " SYSLOG_PATH);
return -1;
}
return 0;
}
static void sighandler(int signo)
{
switch (signo) {
case SIGINT:
case SIGTERM:
syslog_run = 0;
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);
}
static int print_to_log(const syslog_msg_t *msg)
{
const char *fac_name, *lvl_str;
char timebuf[32];
logfile_t *log;
struct tm tm;
fac_name = enum_to_name(facilities, msg->facility);
if (fac_name == NULL)
return -1;
lvl_str = enum_to_name(levels, msg->level);
if (lvl_str == NULL)
return -1;
for (log = logfiles; log != NULL; log = log->next) {
if (log->facility != msg->facility)
continue;
if (msg->ident == NULL && log->ident[0] == '\0')
break;
if (msg->ident != NULL && strcmp(msg->ident, log->ident) == 0)
break;
}
if (log == NULL) {
log = logfile_create(msg->ident, fac_name, msg->facility);
if (log == NULL)
return -1;
log->next = logfiles;
logfiles = log;
}
gmtime_r(&msg->timestamp, &tm);
strftime(timebuf, sizeof(timebuf), "%FT%T", &tm);
logfile_write(log, "[%s][%s][%u] %s", timebuf, lvl_str, msg->pid,
msg->message);
return 0;
}
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 print_to_log(&msg);
}
int main(void)
{
int sfd, status = EXIT_FAILURE;
logfile_t *log;
signal_setup();
sfd = mksock(SYSLOG_SOCKET, SOCK_FLAG_EVERYONE | SOCK_FLAG_DGRAM);
if (sfd < 0)
return EXIT_FAILURE;
if (directory_setup())
goto out;
while (syslog_run) {
handle_data(sfd);
}
status = EXIT_SUCCESS;
out:
while (logfiles != NULL) {
log = logfiles;
logfiles = logfiles->next;
logfile_destroy(log);
}
if (sfd > 0)
close(sfd);
unlink(SYSLOG_SOCKET);
return status;
}
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