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/*
logger.c -- logging code
Copyright (C) 2004-2016 Guus Sliepen <guus@tinc-vpn.org>
2004-2005 Ivo Timmermans
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 2 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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#include "conf.h"
#include "logger.h"
debug_t debug_level = DEBUG_NOTHING;
static logmode_t logmode = LOGMODE_STDERR;
static pid_t logpid;
extern char *logfilename;
static FILE *logfile = NULL;
#ifdef HAVE_MINGW
static HANDLE loghandle = NULL;
#endif
static const char *logident = NULL;
void openlogger(const char *ident, logmode_t mode) {
logident = ident;
logmode = mode;
switch(mode) {
case LOGMODE_STDERR:
logpid = getpid();
break;
case LOGMODE_FILE:
logpid = getpid();
logfile = fopen(logfilename, "a");
if(!logfile) {
fprintf(stderr, "Could not open log file %s: %s\n", logfilename, strerror(errno));
logmode = LOGMODE_NULL;
}
break;
case LOGMODE_SYSLOG:
#ifdef HAVE_MINGW
loghandle = RegisterEventSource(NULL, logident);
if(!loghandle) {
fprintf(stderr, "Could not open log handle!");
logmode = LOGMODE_NULL;
}
break;
#else
#ifdef HAVE_SYSLOG_H
openlog(logident, LOG_CONS | LOG_PID, LOG_DAEMON);
break;
#endif
#endif
case LOGMODE_NULL:
break;
}
}
void reopenlogger() {
if(logmode != LOGMODE_FILE) {
return;
}
fflush(logfile);
FILE *newfile = fopen(logfilename, "a");
if(!newfile) {
logger(LOG_ERR, "Unable to reopen log file %s: %s", logfilename, strerror(errno));
return;
}
fclose(logfile);
logfile = newfile;
}
void logger(int priority, const char *format, ...) {
va_list ap;
char timestr[32] = "";
time_t now;
va_start(ap, format);
switch(logmode) {
case LOGMODE_STDERR:
vfprintf(stderr, format, ap);
fprintf(stderr, "\n");
fflush(stderr);
break;
case LOGMODE_FILE:
now = time(NULL);
strftime(timestr, sizeof(timestr), "%Y-%m-%d %H:%M:%S", localtime(&now));
fprintf(logfile, "%s %s[%ld]: ", timestr, logident, (long)logpid);
vfprintf(logfile, format, ap);
fprintf(logfile, "\n");
fflush(logfile);
break;
case LOGMODE_SYSLOG:
#ifdef HAVE_MINGW
{
char message[4096];
const char *messages[] = {message};
vsnprintf(message, sizeof(message), format, ap);
message[sizeof(message) - 1] = 0;
ReportEvent(loghandle, priority, 0, 0, NULL, 1, 0, messages, NULL);
}
#else
#ifdef HAVE_SYSLOG_H
#ifdef HAVE_VSYSLOG
vsyslog(priority, format, ap);
#else
{
char message[4096];
vsnprintf(message, sizeof(message), format, ap);
syslog(priority, "%s", message);
}
#endif
break;
#endif
#endif
case LOGMODE_NULL:
break;
}
va_end(ap);
}
void closelogger(void) {
switch(logmode) {
case LOGMODE_FILE:
fclose(logfile);
break;
case LOGMODE_SYSLOG:
#ifdef HAVE_MINGW
DeregisterEventSource(loghandle);
break;
#else
#ifdef HAVE_SYSLOG_H
closelog();
break;
#endif
#endif
case LOGMODE_NULL:
case LOGMODE_STDERR:
break;
}
}
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