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/*********************************************************
* Copyright (C) 2010-2015 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no 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 Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/**
* @file sysLogger.c
*
* Logger that writes to syslog(3). Since there's only one "syslog connection"
* for the whole application, this code does reference counting to allow
* different domains to be configured with a "syslog" handler, and still be
* able to call closelog(3) when appropriate.
*/
#include "glibUtils.h"
#include <stdio.h>
#include <string.h>
#include <syslog.h>
typedef struct SysLogger {
GlibLogger handler;
gchar *domain;
gint refcount;
} SysLogger;
static SysLogger *gSysLogger;
static GStaticMutex gSysLoggerLock = G_STATIC_MUTEX_INIT;
/*
*******************************************************************************
* SysLoggerLog -- */ /**
*
* @brief Sends the given log message to syslog.
*
* @param[in] domain Unused.
* @param[in] level Log level.
* @param[in] message Message to log.
* @param[in] data Unused.
*
******************************************************************************
*/
static void
SysLoggerLog(const gchar *domain,
GLogLevelFlags level,
const gchar *message,
gpointer data)
{
gchar *local;
int priority;
/* glib and syslog disagree about critical / error. */
if (level & G_LOG_LEVEL_ERROR) {
priority = LOG_CRIT;
} else if (level & G_LOG_LEVEL_CRITICAL) {
priority = LOG_ERR;
} else if (level & G_LOG_LEVEL_WARNING) {
priority = LOG_WARNING;
} else if (level & G_LOG_LEVEL_MESSAGE) {
priority = LOG_NOTICE;
} else if (level & G_LOG_LEVEL_INFO) {
priority = LOG_INFO;
} else {
priority = LOG_DEBUG;
}
local = g_locale_from_utf8(message, -1, NULL, NULL, NULL);
if (local != NULL) {
syslog(priority, "%s", local);
g_free(local);
} else {
syslog(priority, "%s", message);
}
}
/*
*******************************************************************************
* SysLoggerUnref -- */ /**
*
* @brief Decreases the ref count and closes syslog if it reaches 0.
*
* @param[in] data Unused.
*
*******************************************************************************
*/
static void
SysLoggerUnref(gpointer data)
{
g_return_if_fail(data == gSysLogger);
g_return_if_fail(gSysLogger->refcount > 0);
g_static_mutex_lock(&gSysLoggerLock);
gSysLogger->refcount -= 1;
if (gSysLogger->refcount == 0) {
closelog();
g_free(gSysLogger->domain);
g_free(gSysLogger);
gSysLogger = NULL;
}
g_static_mutex_unlock(&gSysLoggerLock);
}
/*
*******************************************************************************
* GlibUtils_CreateSysLogger -- */ /**
*
* @brief Initializes syslog if it hasn't been done yet.
*
* Since syslog is shared, it's not recommended to change the default domain
* during the lifetime of the application, since that may not reflect on the
* syslogs (and, when it does, it might be confusing).
*
* @param[in] domain Application name, used as the syslog identity.
* @param[in] facility Facility to use. One of: "daemon", "local[0-7]",
"user" (default).
*
* @return Syslog logger data.
*
*******************************************************************************
*/
GlibLogger *
GlibUtils_CreateSysLogger(const char *domain,
const char *facility)
{
g_static_mutex_lock(&gSysLoggerLock);
if (gSysLogger == NULL) {
int facid = LOG_USER;
if (facility != NULL) {
int idx;
if (strcmp(facility, "daemon") == 0) {
facid = LOG_DAEMON;
} else if (sscanf(facility, "local%d", &idx) == 1) {
switch (idx) {
case 0:
facid = LOG_LOCAL0;
break;
case 1:
facid = LOG_LOCAL1;
break;
case 2:
facid = LOG_LOCAL2;
break;
case 3:
facid = LOG_LOCAL3;
break;
case 4:
facid = LOG_LOCAL4;
break;
case 5:
facid = LOG_LOCAL5;
break;
case 6:
facid = LOG_LOCAL6;
break;
case 7:
facid = LOG_LOCAL7;
break;
default:
g_message("Invalid local facility for %s: %s\n", domain, facility);
break;
}
} else if (strcmp(facility, "user") != 0) {
g_message("Invalid syslog facility for %s: %s\n", domain, facility);
}
}
gSysLogger = g_new0(SysLogger, 1);
gSysLogger->handler.addsTimestamp = TRUE;
gSysLogger->handler.shared = FALSE;
gSysLogger->handler.logfn = SysLoggerLog;
gSysLogger->handler.dtor = SysLoggerUnref;
gSysLogger->domain = g_strdup(domain);
gSysLogger->refcount = 1;
openlog(gSysLogger->domain, LOG_CONS | LOG_PID, facid);
} else {
gSysLogger->refcount += 1;
}
g_static_mutex_unlock(&gSysLoggerLock);
return &gSysLogger->handler;
}
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