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/* log.c
*
* Tox DHT bootstrap daemon.
* Logging utility with support of multipel logging backends.
*
* Copyright (C) 2015-2016 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox 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.
*
* Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "log.h"
#include "global.h"
#include <assert.h>
#include <syslog.h>
#include <stdarg.h>
#include <stdio.h>
#define INVALID_BACKEND (LOG_BACKEND)-1u
static LOG_BACKEND current_backend = INVALID_BACKEND;
bool open_log(LOG_BACKEND backend)
{
if (current_backend != INVALID_BACKEND) {
return false;
}
if (backend == LOG_BACKEND_SYSLOG) {
openlog(DAEMON_NAME, LOG_NOWAIT | LOG_PID, LOG_DAEMON);
}
current_backend = backend;
return true;
}
bool close_log(void)
{
if (current_backend == INVALID_BACKEND) {
return false;
}
if (current_backend == LOG_BACKEND_SYSLOG) {
closelog();
}
current_backend = INVALID_BACKEND;
return true;
}
static int level_syslog(LOG_LEVEL level)
{
switch (level) {
case LOG_LEVEL_INFO:
return LOG_INFO;
case LOG_LEVEL_WARNING:
return LOG_WARNING;
case LOG_LEVEL_ERROR:
return LOG_ERR;
}
return LOG_INFO;
}
static void log_syslog(LOG_LEVEL level, const char *format, va_list args)
{
va_list args2;
va_copy(args2, args);
int size = vsnprintf(NULL, 0, format, args2);
va_end(args2);
assert(size >= 0);
if (size < 0) {
return;
}
char buf[size + 1];
vsnprintf(buf, size + 1, format, args);
syslog(level_syslog(level), "%s", buf);
}
static FILE *level_stdout(LOG_LEVEL level)
{
switch (level) {
case LOG_LEVEL_INFO:
return stdout;
case LOG_LEVEL_WARNING: // intentional fallthrough
case LOG_LEVEL_ERROR:
return stderr;
}
return stdout;
}
static void log_stdout(LOG_LEVEL level, const char *format, va_list args)
{
vfprintf(level_stdout(level), format, args);
fflush(level_stdout(level));
}
bool write_log(LOG_LEVEL level, const char *format, ...)
{
va_list args;
va_start(args, format);
switch (current_backend) {
case LOG_BACKEND_SYSLOG:
log_syslog(level, format, args);
break;
case LOG_BACKEND_STDOUT:
log_stdout(level, format, args);
break;
}
va_end(args);
return current_backend != INVALID_BACKEND;
}
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