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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 <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 "log.h"
/* set the logname */
#undef PACKAGE
#define PACKAGE "nslcd"
/* default loglevel when no logging is configured */
static int prelogging_loglevel = LOG_INFO;
/* loglevel to use before logging to syslog */
static int loglevel = LOG_INFO;
#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 */
/* set loglevel when no logging is configured */
void log_setdefaultloglevel(int pri)
{
prelogging_loglevel = pri;
}
/* start the logging with the configured logging methods
if no method is configured yet, logging is done to syslog */
void log_startlogging(void)
{
openlog(PACKAGE, LOG_PID, LOG_DAEMON);
prelogging_loglevel = -1;
}
/* 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, ...)
{
int res;
char buffer[200];
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);
res = vsnprintf(buffer, sizeof(buffer), format, ap);
if ((res < 0) || (res >= (int)sizeof(buffer)))
{
/* truncate with "..." */
buffer[sizeof(buffer) - 2] = '.';
buffer[sizeof(buffer) - 3] = '.';
buffer[sizeof(buffer) - 4] = '.';
}
buffer[sizeof(buffer) - 1] = '\0';
va_end(ap);
/* do the logging */
if (prelogging_loglevel >= 0)
{
/* if logging is not yet defined, log to stderr */
if (pri <= prelogging_loglevel)
{
if ((requestid != NULL) && (requestid[0] != '\0'))
fprintf(stderr, "%s: [%s] <%s> %s%s\n", PACKAGE, sessionid, requestid,
pri == LOG_DEBUG ? "DEBUG: " : "", buffer);
else if ((sessionid != NULL) && (sessionid[0] != '\0'))
fprintf(stderr, "%s: [%s] %s%s\n", PACKAGE, sessionid,
pri == LOG_DEBUG ? "DEBUG: " : "", buffer);
else
fprintf(stderr, "%s: %s%s\n", PACKAGE,
pri == LOG_DEBUG ? "DEBUG: " : "", buffer);
}
}
else
{
if (pri <= loglevel)
{
if ((requestid != NULL) && (requestid[0] != '\0'))
syslog(pri, "[%s] <%s> %s", sessionid, requestid, buffer);
else if ((sessionid != NULL) && (sessionid[0] != '\0'))
syslog(pri, "[%s] %s", sessionid, buffer);
else
syslog(pri, "%s", buffer);
}
}
}
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