//==========================================================================
//
//      ./lib/current/src/snmp_logging.c
//
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####                                            
// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under    
// the terms of the GNU General Public License as published by the Free     
// Software Foundation; either version 2 or (at your option) any later      
// version.                                                                 
//
// eCos 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 General Public License    
// for more details.                                                        
//
// You should have received a copy of the GNU General Public License        
// along with eCos; if not, write to the Free Software Foundation, Inc.,    
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            
//
// As a special exception, if other files instantiate templates or use      
// macros or inline functions from this file, or you compile this file      
// and link it with other works to produce a work based on this file,       
// this file does not by itself cause the resulting work to be covered by   
// the GNU General Public License. However the source code for this file    
// must still be made available in accordance with section (3) of the GNU   
// General Public License v2.                                               
//
// This exception does not invalidate any other reasons why a work based    
// on this file might be covered by the GNU General Public License.         
// -------------------------------------------                              
// ####ECOSGPLCOPYRIGHTEND####                                              
//####UCDSNMPCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from the UCD-SNMP
// project,  <http://ucd-snmp.ucdavis.edu/>  from the University of
// California at Davis, which was originally based on the Carnegie Mellon
// University SNMP implementation.  Portions of this software are therefore
// covered by the appropriate copyright disclaimers included herein.
//
// The release used was version 4.1.2 of May 2000.  "ucd-snmp-4.1.2"
// -------------------------------------------
//
//####UCDSNMPCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    hmt
// Contributors: hmt
// Date:         2000-05-30
// Purpose:      Port of UCD-SNMP distribution to eCos.
// Description:  
//              
//
//####DESCRIPTIONEND####
//
//==========================================================================
/********************************************************************
       Copyright 1989, 1991, 1992 by Carnegie Mellon University

			  Derivative Work -
Copyright 1996, 1998, 1999, 2000 The Regents of the University of California

			 All Rights Reserved

Permission to use, copy, modify and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appears in all copies and
that both that copyright notice and this permission notice appear in
supporting documentation, and that the name of CMU and The Regents of
the University of California not be used in advertising or publicity
pertaining to distribution of the software without specific written
permission.

CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL CMU OR
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*********************************************************************/
/* logging.c - generic logging for snmp-agent
 * Contributed by Ragnar Kjørstad, ucd@ragnark.vestdata.no 1999-06-26 */

#include "config.h"
#include <stdio.h>
#if HAVE_MALLOC_H
#include <malloc.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <sys/types.h>
#ifndef __ECOS
#include <sys/stat.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <errno.h>
#if HAVE_SYSLOG_H
#include <syslog.h>
#endif
#if TIME_WITH_SYS_TIME
# ifdef WIN32
#  include <sys/timeb.h>
# else
#  include <sys/time.h>
# endif
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

#if HAVE_STDARG_H
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#if HAVE_DMALLOC_H
#include <dmalloc.h>
#endif

#ifdef WIN32
#include <winsock.h>
#endif

#include "asn1.h"
#include "default_store.h"
#include "snmp_logging.h"
#include "callback.h"
#define LOGLENGTH 1024

static int do_syslogging=0;
static int do_filelogging=0;
static int do_stderrlogging=1;
static int do_log_callback=0;
static int newline = 1;
static FILE *logfile;

void
init_snmp_logging(void) {
  ds_register_premib(ASN_BOOLEAN, "snmp", "logTimestamp", DS_LIBRARY_ID,
                     DS_LIB_LOG_TIMESTAMP);
}

int
snmp_get_do_logging(void) {
  return (do_syslogging || do_filelogging || do_stderrlogging ||
          do_log_callback);
}


static char *
sprintf_stamp (time_t *now, char *sbuf)
{
    time_t Now;
    struct tm *tm;

    if (now == NULL) {
	now = &Now;
	time (now);
    }
    tm = localtime (now);
    sprintf(sbuf, "%.4d-%.2d-%.2d %.2d:%.2d:%.2d ",
	    tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
	    tm->tm_hour, tm->tm_min, tm->tm_sec);
    return sbuf;
}

void
snmp_disable_syslog(void) {
#if HAVE_SYSLOG_H
  if (do_syslogging)
    closelog();
#endif
  do_syslogging=0;
}


void
snmp_disable_filelog(void) {
  if (do_filelogging)
  {
    fputs("\n",logfile);
    fclose(logfile);
  }
  do_filelogging=0;
}


void
snmp_disable_stderrlog(void) {
  do_stderrlogging=0;
}


void
snmp_disable_log(void) {
  snmp_disable_syslog();
  snmp_disable_filelog();
  snmp_disable_stderrlog();
  snmp_disable_calllog();
}


void
snmp_enable_syslog(void)
{
  snmp_disable_syslog();
#if HAVE_SYSLOG_H
  openlog("ucd-snmp", LOG_CONS|LOG_PID, LOG_DAEMON);
  do_syslogging=1;
#endif
}


void
snmp_enable_filelog(const char *logfilename, int dont_zero_log)
{
  snmp_disable_filelog();
  logfile=fopen(logfilename, dont_zero_log ? "a" : "w");
  if (logfile) {
    do_filelogging=1;
    setvbuf(logfile, NULL, _IOLBF, BUFSIZ);
  }
  else
    do_filelogging=0;
}


void
snmp_enable_stderrlog(void) {
  do_stderrlogging=1;
}


void
snmp_enable_calllog(void) {
  do_log_callback = 1;
}


void
snmp_disable_calllog(void) {
  do_log_callback = 0;
}


void
snmp_log_string (int priority, const char *string)
{
    char sbuf[40];
    struct snmp_log_message slm;

#if HAVE_SYSLOG_H
  if (do_syslogging) {
    syslog(priority, string);
  }
#endif

  if (do_log_callback) {
      slm.priority = priority;
      slm.msg = string;
      snmp_call_callbacks(SNMP_CALLBACK_LIBRARY, SNMP_CALLBACK_LOGGING, &slm);
  }

  if (do_filelogging || do_stderrlogging) {

    if (ds_get_boolean(DS_LIBRARY_ID, DS_LIB_LOG_TIMESTAMP) && newline) {
      sprintf_stamp(NULL, (char *)&sbuf);
    } else {
      strcpy(sbuf, "");
    }
    newline = string[strlen(string)-1] == '\n';

    if (do_filelogging)
      fprintf(logfile, "%s%s", sbuf, string);

    if (do_stderrlogging)
      fprintf(stderr, "%s%s", sbuf, string);
  }
}

int
snmp_vlog (int priority, const char *format, va_list ap)
{
  char buffer[LOGLENGTH];
  int length;
#if HAVE_VSNPRINTF
  char *dynamic;

  length=vsnprintf(buffer, LOGLENGTH, format, ap);
#else
  length=vsprintf(buffer, format, ap);
#endif

  if (length == 0)
    return(0);		/* Empty string */

  if (length == -1) {
    snmp_log_string(LOG_ERR, "Could not format log-string\n");
    return(-1);
  }

  if (length < LOGLENGTH) {
    snmp_log_string(priority, buffer);
    return(0);
  }

#if HAVE_VSNPRINTF
  dynamic=malloc(length+1);
  if (dynamic==NULL) {
    snmp_log_string(LOG_ERR, "Could not allocate memory for log-message\n");
    snmp_log_string(priority, buffer);
    return(-2);
  }

  vsnprintf(dynamic, length+1, format, ap);
  snmp_log_string(priority, dynamic);
  free(dynamic);
  return(0);

#else
  snmp_log_string(priority, buffer);
  snmp_log_string(LOG_ERR, "Log-message too long!\n");
  return(-3);
#endif
}


int
#if HAVE_STDARG_H
snmp_log (int priority, const char *format, ...)
#else
snmp_log (va_alist)
  va_dcl
#endif
{
  va_list ap;
  int ret;
#if HAVE_STDARG_H
  va_start(ap, format);
#else
  int priority;
  const char *format;
  va_start(ap);

  priority = va_arg(ap, int);
  format = va_arg(ap, const char *);
#endif
  ret=snmp_vlog(priority, format, ap);
  va_end(ap);
  return(ret);
}

/*
 * log a critical error.
 */
void
snmp_log_perror(const char *s)
{
  char *error  = strerror(errno);
  if (s) {
    if (error)
      snmp_log(LOG_ERR, "%s: %s\n", s, error);
    else
      snmp_log(LOG_ERR, "%s: Error %d out-of-range\n", s, errno);
  } else {
    if (error)
      snmp_log(LOG_ERR, "%s\n", error);
    else
      snmp_log(LOG_ERR, "Error %d out-of-range\n", errno);
  }
}