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/*
log.c - logging funtions
Copyright (C) 2002, 2003, 2008 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"
/* storage for logging modes */
static struct cvsd_log {
FILE *fp; /* NULL==syslog */
int loglevel;
struct cvsd_log *next;
} *cvsd_loglist=NULL;
/* default loglevel when no logging is configured */
static int prelogging_loglevel=LOG_INFO;
/* the session id that is set for this thread */
static __thread char *sessionid=NULL;
/* set loglevel when no logging is configured */
void log_setdefaultloglevel(int loglevel)
{
prelogging_loglevel=loglevel;
}
/* add logging method to configuration list */
static void log_addlogging_fp(FILE *fp,int loglevel)
{
struct cvsd_log *tmp,*lst;
/* create new logstruct */
tmp=(struct cvsd_log *)malloc(sizeof(struct cvsd_log));
if (tmp==NULL)
{
fprintf(stderr,"malloc() failed: %s",strerror(errno));
/* since this is done during initialisation it's best to bail out */
exit(EXIT_FAILURE);
}
tmp->fp=fp;
tmp->loglevel=loglevel;
tmp->next=NULL;
/* save the struct in the list */
if (cvsd_loglist==NULL)
cvsd_loglist=tmp;
else
{
for (lst=cvsd_loglist;lst->next!=NULL;lst=lst->next);
lst->next=tmp;
}
}
/* configure logging to a file */
void log_addlogging_file(const char *filename,int loglevel)
{
FILE *fp;
fp=fopen(filename,"a");
if (fp==NULL)
{
log_log(LOG_ERR,"cannot open logfile (%s) for appending: %s",filename,strerror(errno));
exit(EXIT_FAILURE);
}
log_addlogging_fp(fp,loglevel);
}
/* configure logging to syslog */
void log_addlogging_syslog(int loglevel)
{
openlog(PACKAGE,LOG_PID,LOG_DAEMON);
log_addlogging_fp(NULL,loglevel);
}
/* configure a null logging mode (no logging) */
void log_addlogging_none()
{
/* this is a hack, but it's so easy */
log_addlogging_fp(NULL,LOG_EMERG);
}
/* start the logging with the configured logging methods
if no method is configured yet, logging is done to syslog */
void log_startlogging(void)
{
if (cvsd_loglist==NULL)
log_addlogging_syslog(LOG_INFO);
prelogging_loglevel=-1;
}
/* 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));
}
/* log the given message using the configured logging method */
void log_log(int pri,const char *format, ...)
{
int res;
struct cvsd_log *lst;
/* TODO: make this something better */
#define maxbufferlen 200
char buffer[maxbufferlen];
va_list ap;
/* make the message */
va_start(ap,format);
res=vsnprintf(buffer,maxbufferlen,format,ap);
if ((res<0)||(res>=maxbufferlen))
{
/* truncate with "..." */
buffer[maxbufferlen-2]='.';
buffer[maxbufferlen-3]='.';
buffer[maxbufferlen-4]='.';
}
buffer[maxbufferlen-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 (sessionid)
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
{
for (lst=cvsd_loglist;lst!=NULL;lst=lst->next)
{
if (pri<=lst->loglevel)
{
if (lst->fp==NULL) /* syslog */
{
if (sessionid)
syslog(pri,"[%s] %s",sessionid,buffer);
else
syslog(pri,"%s",buffer);
}
else /* file */
{
if (sessionid)
fprintf(lst->fp,"%s: [%s] %s\n",sessionid,PACKAGE,buffer);
else
fprintf(lst->fp,"%s: %s\n",PACKAGE,buffer);
fflush(lst->fp);
}
}
}
}
}
/* return the syslog loglevel represented by the string
return -1 on unknown */
int log_getloglevel(const char *lvl)
{
if ( strcmp(lvl,"crit")==0 )
return LOG_CRIT;
else if ( (strcmp(lvl,"error")==0) ||
(strcmp(lvl,"err")==0) )
return LOG_ERR;
else if ( strcmp(lvl,"warning")==0 )
return LOG_WARNING;
else if ( strcmp(lvl,"notice")==0 )
return LOG_NOTICE;
else if ( strcmp(lvl,"info")==0 )
return LOG_INFO;
else if ( strcmp(lvl,"debug")==0 )
return LOG_DEBUG;
else
return -1; /* unknown */
}
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