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/*
* log.c - log module for logging to syslog
*
* Copyright 2003-2005 Derek D. Martin ( code at pizzashack dot org ).
*
* This program is licensed under a BSD-style license, as follows:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/* SYSTEM INCLUDES */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif /* HAVE_STDLIB_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_LIBGEN_H
#include <libgen.h>
#endif /* HAVE_LIBGEN_H */
#ifdef HAVE_SYSLOG_H
#include <syslog.h>
#endif /* HAVE_SYSLOG_H */
#ifdef HAVE_STDARG_H
#include <stdarg.h>
#endif /* HAVE_STDARG_H */
/* LOCAL INCLUDES */
#include "log.h"
/* FILE SCOPE VARIABLES */
static char *ident = NULL; /* prefix for log messages (usually progname) */
static int facility = LOG_USER;
static int level = LOG_WARNING;
/*
* log_set_ident() - set the ident field for openlog()
* args: name - character string to set ident to
*/
char *log_set_ident( const char *name )
{
/* lose the existing value of ident, if there is one */
if ( ident ){
free(ident);
ident = NULL;
}
if ( name ) ident = strdup(name);
return ident;
}
/*
* log_make_ident() - make the ident field for openlog() from a path
* args: name - character string to set ident to
* (use to set from argv[0])
*/
char *log_make_ident( const char *name )
{
char *temp;
/* lose the existing value of ident, if there is one */
if ( ident ){
free(ident);
ident = NULL;
}
/* assign new value to ident from name */
if ( !name ) return (ident = NULL);
ident = strdup(basename((char*)name));
/* remove leading '-' from ident, if there is one */
if ( ident[0] == '-' ){
temp = strdup(ident + 1);
free(ident);
ident = temp;
}
return ident;
}
void log_set_priority( int new_level )
{
level = new_level;
}
void log_set_facility( int new_fac )
{
facility = new_fac;
}
void log_open( void )
{
openlog( ident, LOG_CONS | LOG_PID, facility );
}
void log_close( void )
{
closelog();
}
/*
* lm_create_log_buffer() - this function takes advantage of the return
* value of vsnprintf() and the realloc() function to allocate a buffer
* which is either exactly the right size for the message (in the case
* of GLIBC >= 2.1) or at least large enough to hold the entire message.
*/
void log_msg( char *msg, ... )
{
char *format_temp = NULL;
va_list arglist;
int length; /* length of msg */
int retc; /* return code */
/*
* make a guess how big the message will be -- initially we'll allow
* 50 characters for formatting variable args
*/
length = 50 + strlen( msg );
if ( (format_temp = (char *)malloc( length )) == NULL){
syslog(LOG_ERR, "Could not allocate mem in log_msg(), log.c");
exit(1);
}
memset( format_temp, 0, length );
/* try to print msg to buffer, until we succeed or fail conclusively */
va_start( arglist, msg );
retc = vsnprintf( format_temp, length, msg, arglist );
va_end( arglist );
/*
* Check retc to make sure it fit account for differences in libc
* versions (grumble)... Per C99, retc is # of chars that WOULD have
* been copied if format_temp was large enough, so make the buffer
* that size.
*/
if ( retc > length ){
if ( (format_temp = (char *)realloc( format_temp, retc + 1 ))
== NULL ){
syslog(LOG_ERR,
"Could not allocate mem in log_msg(), log.c");
exit(1);
}
va_start( arglist, msg );
vsnprintf( format_temp, retc + 1, msg, arglist );
va_end( arglist );
}
/* if retc == -1, we must be compiled under pre-C99 libc */
while ( retc == -1 ){
length += 50;
if ( (format_temp = (char *)realloc( format_temp, length ))
== NULL ){
syslog(LOG_ERR,
"Could not allocate mem in log_msg(), log.c");
exit(1);
}
memset( format_temp, 0, length );
va_start( arglist, msg );
retc = vsnprintf( format_temp, length, msg, arglist );
va_end( arglist );
}
syslog((facility | level), "%s", format_temp);
free(format_temp);
}
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