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//==========================================================================

//

//      ./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 Red Hat, 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.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 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.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-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);

  }

}