//==========================================================================
//
//      ./agent/current/src/mibgroup/mibII/system_mib.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.
*********************************************************************/
/*
 *  System MIB group implementation - system.c
 *
 */

#include <config.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif

#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

#include <ctype.h>
#if HAVE_UTSNAME_H
#include <utsname.h>
#else
#if HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

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

#include "mibincl.h"
#include "mibgroup/mibII/system_mib.h"
#include "mibgroup/struct.h"
#include "mibgroup/util_funcs.h"
#include "read_config.h"
#include "agent_read_config.h"
#include "system.h"
#include "mibgroup/mibII/sysORTable.h"


	/*********************
	 *
	 *  Kernel & interface information,
	 *   and internal forward declarations
	 *
	 *********************/

#define SYS_STRING_LEN	256
char version_descr[ SYS_STRING_LEN ] = VERS_DESC;
char sysContact[    SYS_STRING_LEN ] = SYS_CONTACT;
char sysName[       SYS_STRING_LEN ] = SYS_NAME;
char sysLocation[   SYS_STRING_LEN ] = SYS_LOC;

char oldversion_descr[ SYS_STRING_LEN ];
char oldsysContact[    SYS_STRING_LEN ];
char oldsysName[       SYS_STRING_LEN ];
char oldsysLocation[   SYS_STRING_LEN ];

int sysServices=72;
int sysServicesConfiged=0;

extern oid version_id[];
extern int version_id_len;

extern struct timeval starttime;

WriteMethod writeSystem;
int header_system(struct variable *,oid *, size_t *, int, size_t *, WriteMethod **);

/* snmpd.conf config parsing */

void system_parse_config_sysloc(const char *token, 
				char *cptr)
{
  char tmpbuf[1024];
  
  if (strlen(cptr) < sizeof(sysLocation)) {
    strcpy(sysLocation,cptr);
  } else {
    sprintf(tmpbuf, "syslocation token too long (must be < %d):\n\t%s",
		 sizeof(sysLocation), cptr);
    config_perror(tmpbuf);
  }
}

void system_parse_config_sysServices(const char *token, char *cptr)
{
  sysServices = atoi(cptr);
  sysServicesConfiged = 1;
}

void system_parse_config_syscon(const char *token, 
				char *cptr)
{
  char tmpbuf[1024];

  if (strlen(cptr) < sizeof(sysContact)) {
    strcpy(sysContact,cptr);
  } else {
    sprintf(tmpbuf, "syscontact token too long (must be < %d):\n\t%s",
                 sizeof(sysContact), cptr);
    config_perror(tmpbuf);
  }
}


	/*********************
	 *
	 *  Initialisation & common implementation functions
	 *
	 *********************/

/* define the structure we're going to ask the agent to register our
   information at */
struct variable2 system_variables[] = {
    {VERSION_DESCR, ASN_OCTET_STR, RONLY, var_system, 1, {1}},
    {VERSIONID, ASN_OBJECT_ID, RONLY, var_system, 1, {2}},
    {UPTIME, ASN_TIMETICKS, RONLY, var_system, 1, {3}},
    {SYSCONTACT, ASN_OCTET_STR, RWRITE, var_system, 1, {4}},
    {SYSTEMNAME, ASN_OCTET_STR, RWRITE, var_system, 1, {5}},
    {SYSLOCATION, ASN_OCTET_STR, RWRITE, var_system, 1, {6}},
    {SYSSERVICES, ASN_INTEGER, RONLY, var_system, 1, {7}},
    {SYSORLASTCHANGE, ASN_TIMETICKS, RONLY, var_system, 1, {8}}
};
/* Define the OID pointer to the top of the mib tree that we're
   registering underneath */
oid system_variables_oid[] = { SNMP_OID_MIB2,1 };
oid system_module_oid[]    = { SNMP_OID_SNMPMODULES,1 };
int system_module_oid_len  = sizeof( system_module_oid ) / sizeof( oid );
int system_module_count    = 0;

void init_system_mib(void)
{

#ifdef HAVE_UNAME
  struct utsname utsName;

  uname(&utsName);
  sprintf(version_descr, "%s %s %s %s %s", utsName.sysname, utsName.nodename,
          utsName.release, utsName.version, utsName.machine);
#else
#if HAVE_EXECV
  struct extensible extmp;

  /* set default values of system stuff */
  sprintf(extmp.command,"%s -a",UNAMEPROG);
  /* setup defaults */
  extmp.type = EXECPROC;
  extmp.next = NULL;
  exec_command(&extmp);
  strncpy(version_descr,extmp.output, sizeof(version_descr));
  version_descr[strlen(version_descr)-1] = 0; /* chomp new line */
#else
#ifdef __ECOS
  sysServicesConfiged = 1; // May as well return the dummy value
#else
#endif // !__ECOS
#endif // !HAVE_EXECV
#endif // !HAVE_UNAME

#ifdef HAVE_GETHOSTNAME
  gethostname(sysName,sizeof(sysName));
#else
#ifdef HAVE_UNAME
  strncpy(sysName,utsName.nodename,sizeof(sysName));
#else
#if HAVE_EXECV
  sprintf(extmp.command,"%s -n",UNAMEPROG);
  /* setup defaults */
  extmp.type = EXECPROC;
  extmp.next = NULL;
  exec_command(&extmp);
  strncpy(sysName,extmp.output, sizeof(sysName));
  sysName[strlen(sysName)-1] = 0; /* chomp new line */
#endif /* HAVE_EXECV */
#endif /* HAVE_UNAME */
#endif /* HAVE_GETHOSTNAME */

  /* register ourselves with the agent to handle our mib tree */
  REGISTER_MIB("mibII/system", system_variables, variable2, \
               system_variables_oid);

  if ( ++system_module_count == 3 )
	REGISTER_SYSOR_ENTRY( system_module_oid,
		"The MIB module for SNMPv2 entities");
  
  /* register our config handlers */
  snmpd_register_config_handler("syslocation", system_parse_config_sysloc,
                                NULL, "location");
  snmpd_register_config_handler("syscontact", system_parse_config_syscon,
                                NULL,"contact-name");
  snmpd_register_config_handler("sysservices", system_parse_config_sysServices,
                                NULL,"NUMBER");

}

/*
  header_system(...
  Arguments:
  vp	  IN      - pointer to variable entry that points here
  name    IN/OUT  - IN/name requested, OUT/name found
  length  IN/OUT  - length of IN/OUT oid's 
  exact   IN      - TRUE if an exact match was requested
  var_len OUT     - length of variable or 0 if function returned
  write_method
  
*/

int
header_system(struct variable *vp,
	      oid *name,
	      size_t *length,
	      int exact,
	      size_t *var_len,
	      WriteMethod **write_method)
{
#define SYSTEM_NAME_LENGTH	8
    oid newname[MAX_OID_LEN];
    int result;

    DEBUGMSGTL(("mibII/system", "var_system: "));
    DEBUGMSGOID(("mibII/system", name, *length));
    DEBUGMSG(("mibII/system"," %d\n", exact));

    memcpy((char *)newname, (char *)vp->name, vp->namelen * sizeof(oid));
    newname[SYSTEM_NAME_LENGTH] = 0;
    result = snmp_oid_compare(name, *length, newname, vp->namelen + 1);
    if ((exact && (result != 0)) || (!exact && (result >= 0)))
        return(MATCH_FAILED);
    memcpy( (char *)name,(char *)newname, (vp->namelen + 1) * sizeof(oid));
    *length = vp->namelen + 1;

    *write_method = 0;
    *var_len = sizeof(long);	/* default to 'long' results */
    return(MATCH_SUCCEEDED);
}

	/*********************
	 *
	 *  System specific implementation functions
	 *	(actually common!)
	 *
	 *********************/

#ifdef USING_MIBII_SYSORTABLE_MODULE
extern struct timeval sysOR_lastchange;
#endif

u_char	*
var_system(struct variable *vp,
	   oid *name,
	   size_t *length,
	   int exact,
	   size_t *var_len,
	   WriteMethod **write_method)
{

  struct timeval now, diff;

    if (header_system(vp, name, length, exact, var_len, write_method) == MATCH_FAILED )
	return NULL;

    switch (vp->magic){
        case VERSION_DESCR:
            *var_len = strlen(version_descr);
            *write_method = writeSystem;
            return (u_char *)version_descr;
        case VERSIONID:
            *var_len = version_id_len*sizeof(version_id[0]);
            return (u_char *)version_id;
        case UPTIME:
            gettimeofday(&now, NULL);
            now.tv_sec--;
            now.tv_usec += 1000000L;
            diff.tv_sec = now.tv_sec - starttime.tv_sec;
            diff.tv_usec = now.tv_usec - starttime.tv_usec;
            if (diff.tv_usec > 1000000L){
                diff.tv_usec -= 1000000L;
                diff.tv_sec++;
            }
            long_return = ((diff.tv_sec * 100) + (diff.tv_usec / 10000));
            return ((u_char *) &long_return);
        case SYSCONTACT:
            *var_len = strlen(sysContact);
            *write_method = writeSystem;
            return (u_char *)sysContact;
        case SYSTEMNAME:
            *var_len = strlen(sysName);
            *write_method = writeSystem;
            return (u_char *)sysName;
        case SYSLOCATION:
            *var_len = strlen(sysLocation);
            *write_method = writeSystem;
            return (u_char *)sysLocation;
        case SYSSERVICES:
#if NO_DUMMY_VALUES
            if (!sysServicesConfiged)
                return NULL;
#endif
            long_return = sysServices;
            return (u_char *)&long_return;

#ifdef USING_MIBII_SYSORTABLE_MODULE
        case SYSORLASTCHANGE:
              diff.tv_sec = sysOR_lastchange.tv_sec - 1 - starttime.tv_sec;
              diff.tv_usec =
                sysOR_lastchange.tv_usec + 1000000L - starttime.tv_usec;
              if (diff.tv_usec > 1000000L){
                diff.tv_usec -= 1000000L;
                diff.tv_sec++;
              }
              if ((diff.tv_sec * 100) + (diff.tv_usec / 10000) < 0)
                long_return = 0;
              else
                long_return = ((diff.tv_sec * 100) + (diff.tv_usec / 10000));
              return ((u_char *) &long_return);
#endif
              
	default:
	    DEBUGMSGTL(("snmpd", "unknown sub-id %d in var_system\n", vp->magic));
    }
    return NULL;
}



int
writeSystem(int action,	     
	    u_char *var_val,
	    u_char var_val_type,
	    size_t var_val_len,
	    u_char *statP,
	    oid *name,
	    size_t name_len)
{
    u_char *cp;
    char *buf = NULL, *oldbuf = NULL;
    int count;

    switch((char)name[7]){
      case VERSION_DESCR:
        buf    = version_descr;
        oldbuf = oldversion_descr;
        break;
      case SYSCONTACT:
        buf    = sysContact;
        oldbuf = oldsysContact;
        break;
      case SYSTEMNAME:
        buf    = sysName;
        oldbuf = oldsysName;
        break;
      case SYSLOCATION:
        buf    = sysLocation;
        oldbuf = oldsysLocation;
        break;
      default:
	return SNMP_ERR_GENERR;		/* ??? */
    }

    switch ( action ) {
	case RESERVE1:		/* Check values for acceptability */
	    if (var_val_type != ASN_OCTET_STR){
                snmp_log(LOG_ERR, "not string\n");
		return SNMP_ERR_WRONGTYPE;
	    }
	    if (var_val_len > sizeof(version_descr)-1){
                snmp_log(LOG_ERR, "bad length\n");
		return SNMP_ERR_WRONGLENGTH;
	    }
	    
	    for(cp = var_val, count = 0; count < (int)var_val_len; count++, cp++){
		if (!isprint(*cp)){
                    snmp_log(LOG_ERR, "not print %x\n", *cp);
		    return SNMP_ERR_WRONGVALUE;
		}
	    }
	    break;

	case RESERVE2:		/* Allocate memory and similar resources */

		/* Using static strings, so nothing needs to be done */
	    break;

	case ACTION:		/* Perform the SET action (if reversible) */

		/* Save the old value, in case of UNDO */
	    strcpy( oldbuf, buf);
	    memcpy( buf, var_val, var_val_len);
	    buf[var_val_len] = 0;
	    break;

	case UNDO:		/* Reverse the SET action and free resources */

	    strcpy( buf, oldbuf);
	    oldbuf[0] = 0;
	    break;

	case COMMIT:		/* Confirm the SET, performing any irreversible actions,
					and free resources */
	case FREE:		/* Free any resources allocated */

		/* No resources have been allocated, but "empty" the 'oldbuf' */
	    oldbuf[0] = 0;
	    break;
    }
    return SNMP_ERR_NOERROR;
} /* end of writeSystem */

	/*********************
	 *
	 *  Internal implementation functions - None
	 *
	 *********************/

