snmpmsg.cpp

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/*===================================================================

  Copyright (c) 1996
  Hewlett-Packard Company

  ATTENTION: USE OF THIS SOFTWARE IS SUBJECT TO THE FOLLOWING TERMS.
  Permission to use, copy, modify, distribute and/or sell this software 
  and/or its documentation is hereby granted without fee. User agrees 
  to display the above copyright notice and this license notice in all 
  copies of the software and any documentation of the software. User 
  agrees to assume all liability for the use of the software; Hewlett-Packard 
  makes no representations about the suitability of this software for any 
  purpose. It is provided "AS-IS without warranty of any kind,either express 
  or implied. User hereby grants a royalty-free license to any and all 
  derivatives based upon this software code base. 


  SNMP++ S N M P M E S S A G E . C P P   
      
  SNMPMESSAGE CLASS DEFINITION
       
  VERSION:
  2.6
  
  RCS INFO:
  $Header: Exp $
       
  DESIGN:
  Peter E Mellquist
                
  AUTHOR:      
  Peter E Mellquist
              
  LANGUAGE:
  ANSI C++ 
      
  OPERATING SYSTEMS:
  Win 32
  BSD UNIX
      
  DESCRIPTION:
  ASN.1	encoding / decoding class
      		 
=====================================================================*/ 

#include "snmpmsg.h"	                // header file for SnmpMessage
#include "asn1.h"                       // ASN.1 header file
#include "stdio.h"                      // standard io file 



//--------------[ well known trap ids ]-----------------------------------
// SMI trap oid def
class snmpTrapsOid: public Oid {
   public: 
   snmpTrapsOid (void):Oid("1.3.6.1.6.3.1.1.5"){};
}; 

// SMI Enterprise Oid
class snmpTrapEnterpriseOid: public Oid {
   public: 
   snmpTrapEnterpriseOid(void):Oid("1.3.6.1.6.3.1.1.4.3.0"){};
}; 

// SMI Cold Start Oid
class coldStartOid: public snmpTrapsOid {
   public: 
   coldStartOid( void){*this+=".1";};
};

// SMI WarmStart Oid
class warmStartOid: public snmpTrapsOid {
   public: 
   warmStartOid( void){*this+=".2";};
};

// SMI LinkDown Oid
class linkDownOid: public snmpTrapsOid {
   public: 
   linkDownOid( void){*this+=".3";};
}; 


// SMI LinkUp Oid
class linkUpOid: public snmpTrapsOid {
   public: 
   linkUpOid( void){*this+=".4";};
};

// SMI Authentication Failure Oid
class authenticationFailureOid: public snmpTrapsOid {
   public: 
   authenticationFailureOid( void){*this+=".5";};
}; 

// SMI egpneighborloss Oid
class egpNeighborLossOid: public snmpTrapsOid {
   public: 
   egpNeighborLossOid( void){*this+=".6";};
};

const coldStartOid coldStart;
const warmStartOid warmStart;
const linkDownOid linkDown;
const linkUpOid linkUp;
const authenticationFailureOid authenticationFailure;
const egpNeighborLossOid egpNeighborLoss;
const snmpTrapEnterpriseOid snmpTrapEnterprise;

//------------[ convert SNMP++ VB to WinSNMP smiVALUE ]----------------
int convertVbToSmival( Vb &tempvb, SmiVALUE *smival )
{
   smival->syntax = tempvb.get_syntax();
   switch ( smival->syntax ) {

	  // case sNMP_SYNTAX_NULL
   case sNMP_SYNTAX_NULL:
   case sNMP_SYNTAX_NOSUCHOBJECT:
   case sNMP_SYNTAX_NOSUCHINSTANCE:
   case sNMP_SYNTAX_ENDOFMIBVIEW:
     break;

	  // case sNMP_SYNTAX_INT32:
      case sNMP_SYNTAX_INT:
	  tempvb.get_value(smival->value.sNumber);
	  break;

      //    case sNMP_SYNTAX_UINT32:
      case sNMP_SYNTAX_GAUGE32:
      case sNMP_SYNTAX_CNTR32:
      case sNMP_SYNTAX_TIMETICKS:
	  case sNMP_SYNTAX_UINT32:
	  tempvb.get_value(smival->value.uNumber);
	  break;

	  // case Counter64
      case sNMP_SYNTAX_CNTR64:
      {
	     Counter64 c64;
	     tempvb.get_value(c64);
	     smival->value.hNumber.hipart = c64.high();
	     smival->value.hNumber.lopart = c64.low();
	  }
	  break;

      case sNMP_SYNTAX_BITS:
      case sNMP_SYNTAX_OCTETS:
      case sNMP_SYNTAX_IPADDR:
      {
	     OctetStr os;
	     tempvb.get_value(os);
	     smival->value.string.ptr = NULL;
	     smival->value.string.len = os.len();
	     if ( smival->value.string.len > 0 ) 
		 {
			smival->value.string.ptr = (SmiLPBYTE) new  unsigned char [smival->value.string.len];
	        if ( smival->value.string.ptr ) 
		    {
               for (int i=0; i<(int) smival->value.string.len ; i++)
		          smival->value.string.ptr[i] = os[i];
	        } 
		    else 
		    { 
	           smival->syntax = sNMP_SYNTAX_NULL;  // invalidate the smival
	           return SNMP_CLASS_RESOURCE_UNAVAIL;
	        }
	     }
      }
      break;

      case sNMP_SYNTAX_OID:
	  {
	     Oid oid;
	     tempvb.get_value(oid);
	     smival->value.oid.ptr = NULL;
	     smival->value.oid.len = oid.len();
	     if ( smival->value.oid.len > 0 ) 
		 {
			smival->value.oid.ptr = (SmiLPUINT32) new unsigned long [ smival->value.oid.len];
	        if ( smival->value.oid.ptr ) 
			{
               for (int i=0; i<(int)smival->value.oid.len ; i++)
		          smival->value.oid.ptr[i] = oid[i];
	        } 
			else 
			{
	            smival->syntax = sNMP_SYNTAX_NULL;  // invalidate the smival
	            return SNMP_CLASS_RESOURCE_UNAVAIL;
	        }
	    }
	  }
	  break;

      default:
        return SNMP_CLASS_INTERNAL_ERROR;
   }
   return SNMP_CLASS_SUCCESS;
};

// free a SMI value
void freeSmivalDescriptor( SmiVALUE *smival )
{
   switch ( smival->syntax ) {
     case sNMP_SYNTAX_OCTETS:
     case sNMP_SYNTAX_OPAQUE:
     case sNMP_SYNTAX_IPADDR:
     case sNMP_SYNTAX_BITS:		    // obsoleted in SNMPv2 Draft Std
          delete [] smival->value.string.ptr;	   
       break;

     case sNMP_SYNTAX_OID:
		  delete [] smival->value.oid.ptr;
       break;
   }
   smival->syntax = sNMP_SYNTAX_NULL;
};


// load up a SnmpMessage
int SnmpMessage::load( Pdu pdu,                      // Pdu object to load
					   OctetStr community,           // community to use
					   snmp_version version)         // version 1 or 2
{
	int status;

	// create a raw pdu
	snmp_pdu *raw_pdu;
	raw_pdu = snmp_pdu_create( (int) pdu.get_type());
	
	Oid enterprise;

	// make sure pdu is valid
	if ( !pdu.valid()) 
		return SNMP_CLASS_INVALID_PDU;

	// load it up
	raw_pdu->reqid = pdu.get_request_id();
	raw_pdu->errstat= (unsigned long) pdu.get_error_status();
	raw_pdu->errindex= (unsigned long) pdu.get_error_index();

	// if its a V1 trap then load up other values
	// for v2, use normal pdu format
	if ( raw_pdu->command == sNMP_PDU_V1TRAP) {
	   // DON'T forget about the v1 trap agent address (changed by Frank Fock)
	  char addrString[256];
	  if (gethostname(addrString, 255) == 0) {

	    int status = 0;
	    IpAddress my_address;

	    hostent *lookupResult;
	    char    *namePtr = NULL;
	    in_addr ipAddr;
	    
	    if ((ipAddr.s_addr = inet_addr(addrString)) == -1){
	      lookupResult = gethostbyname(addrString);
	      if (lookupResult) {
		if (lookupResult->h_length == sizeof(in_addr)){
		  memcpy((void *) &ipAddr, (void *) lookupResult->h_addr_list[0],
			 sizeof(in_addr));
		  my_address = inet_ntoa(ipAddr);
		}
	      }
	    }
	    else
	      my_address = addrString;

	    struct sockaddr_in agent_addr;  // agent address socket struct

	    // prepare the agent address
	    memset(&agent_addr, 0, sizeof(agent_addr));
	    agent_addr.sin_family = AF_INET;
	    agent_addr.sin_addr.s_addr = inet_addr(((IpAddress &)my_address).IpAddress::get_printable());
	    raw_pdu->agent_addr = agent_addr;
	  }

	   //-----[ compute generic trap value ]-------------------------------
       // determine the generic value
       // 0 - cold start
       // 1 - warm start
       // 2 - link down
       // 3 - link up
       // 4 - authentication failure
       // 5 - egpneighborloss
       // 6 - enterprise specific
	   Oid trapid;
	   pdu.get_notify_id( trapid);
	   if ( !trapid.valid() || trapid.len() < 2 ) 
	   {
 	       snmp_free_pdu( raw_pdu);
	       return SNMP_CLASS_INVALID_NOTIFYID;
       }
	   raw_pdu->specific_type=0;
       if ( trapid == coldStart)
          raw_pdu->trap_type = 0;  // cold start
       else if ( trapid == warmStart)
          raw_pdu->trap_type = 1;  // warm start
       else if( trapid == linkDown)
          raw_pdu->trap_type = 2;  // link down
       else if ( trapid == linkUp)
          raw_pdu->trap_type = 3;  // link up
       else if ( trapid == authenticationFailure )
          raw_pdu->trap_type = 4;  // authentication failure