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/*
log.c - logging funtions
Copyright (C) 2002, 2003, 2008, 2010, 2011, 2012, 2013 Arthur de Jong
This library 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; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "config.h"
#include <systemd/sd-daemon.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <syslog.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <pthread.h>
#include <strings.h>
#include "log.h"
#define MAX_REQUESTID_LENGTH 40
#ifdef TLS
/* the session id that is set for this thread */
static TLS char *sessionid = NULL;
/* the request identifier that is set for this thread */
static TLS char *requestid = NULL;
#else /* no TLS, use pthreads */
static pthread_once_t tls_init_once = PTHREAD_ONCE_INIT;
static pthread_key_t sessionid_key;
static pthread_key_t requestid_key;
static void tls_init_keys(void)
{
pthread_key_create(&sessionid_key, NULL);
pthread_key_create(&requestid_key, NULL);
}
#endif /* no TLS, use pthreads */
static char *loglevel2sd(int pri) {
switch(pri) {
case LOG_EMERG: return SD_EMERG;
case LOG_ALERT: return SD_ALERT;
case LOG_CRIT: return SD_CRIT;
case LOG_ERR: return SD_ERR;
case LOG_WARNING: return SD_WARNING;
case LOG_NOTICE: return SD_NOTICE;
case LOG_INFO: return SD_INFO;
case LOG_DEBUG: return SD_DEBUG;
}
return "<?>";
}
/* indicate that we should clear any session identifiers set by
log_newsession */
void log_clearsession(void)
{
#ifndef TLS
char *sessionid, *requestid;
pthread_once(&tls_init_once, tls_init_keys);
sessionid = pthread_getspecific(sessionid_key);
requestid = pthread_getspecific(requestid_key);
#endif /* no TLS */
/* set the session id to empty */
if (sessionid != NULL)
sessionid[0] = '\0';
/* set the request id to empty */
if (requestid != NULL)
requestid[0] = '\0';
}
/* indicate that a session id should be included in the output
and set it to a new value */
void log_newsession(void)
{
#ifndef TLS
char *sessionid, *requestid;
pthread_once(&tls_init_once, tls_init_keys);
sessionid = pthread_getspecific(sessionid_key);
requestid = pthread_getspecific(requestid_key);
#endif /* no TLS */
/* ensure that sessionid can hold a string */
if (sessionid == NULL)
{
sessionid = (char *)malloc(7);
if (sessionid == NULL)
{
fprintf(stderr, "malloc() failed: %s", strerror(errno));
return; /* silently fail */
}
#ifndef TLS
pthread_setspecific(sessionid_key, sessionid);
#endif /* no TLS */
}
sprintf(sessionid, "%06x", (int)(rand() & 0xffffff));
/* set the request id to empty */
if (requestid != NULL)
requestid[0] = '\0';
}
/* indicate that a request identifier should be included in the output
from this point on, until log_newsession() is called */
void log_setrequest(const char *format, ...)
{
va_list ap;
#ifndef TLS
char *requestid;
pthread_once(&tls_init_once, tls_init_keys);
requestid = pthread_getspecific(requestid_key);
#endif /* no TLS */
/* ensure that requestid can hold a string */
if (requestid == NULL)
{
requestid = (char *)malloc(MAX_REQUESTID_LENGTH);
if (requestid == NULL)
{
fprintf(stderr, "malloc() failed: %s", strerror(errno));
return; /* silently fail */
}
#ifndef TLS
pthread_setspecific(requestid_key, requestid);
#endif /* no TLS */
}
/* make the message */
va_start(ap, format);
vsnprintf(requestid, MAX_REQUESTID_LENGTH, format, ap);
requestid[MAX_REQUESTID_LENGTH - 1] = '\0';
va_end(ap);
}
/* log the given message using the configured logging method */
void log_log(int pri, const char *format, ...)
{
char *msg = NULL;
va_list ap;
#ifndef TLS
char *sessionid, *requestid;
pthread_once(&tls_init_once, tls_init_keys);
sessionid = pthread_getspecific(sessionid_key);
requestid = pthread_getspecific(requestid_key);
#endif /* no TLS */
/* make the message */
va_start(ap, format);
if (vasprintf(&msg, format, ap) < 0) {
fprintf(stderr, SD_ERR "vasprintf() in logger failed");
}
va_end(ap);
}
/* do the logging */
if ((requestid != NULL) && (requestid[0] != '\0'))
fprintf(stderr, "%s[sess:%s] <req:%s> %s\n", loglevel2sd(pri), sessionid, requestid, msg);
else if ((sessionid != NULL) && (sessionid[0] != '\0'))
fprintf(stderr, "%s[sess:%s] %s\n", loglevel2sd(pri), sessionid, msg);
else
fprintf(stderr, "%s%s\n", loglevel2sd(pri), msg);
fflush(stderr);
free(msg);
}
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