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/*
log.c - logging funtions
Copyright (C) 2002, 2003, 2008, 2010, 2011 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 "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;
/* the session id that is set for this thread */
static __thread char *sessionid=NULL;
/* the request identifier that is set for this thread */
static __thread char *requestid=NULL;
#define MAX_REQUESTID_LENGTH 40
/* 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)
{
/* 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)
{
/* 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 */
}
}
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;
/* 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 */
}
}
/* 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;
/* 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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