489 lines
13 KiB
C
489 lines
13 KiB
C
/*++ BUILD Version: 0001 // Increment this if a change has global effects.
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Copyright (c) 1995 Microsoft Corporation
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Module Name :
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mib.c
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Abstract:
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This defines Auxiliary functions for defining an SNMP Extension Agent
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for collecting and querying Statistical information.
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Author:
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Murali R. Krishnan ( MuraliK ) 23-Feb-1995
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Environment:
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User Mode -- Win32
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Project:
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SNMP Extension DLL for HTTP Service DLL
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Functions Exported:
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UINT ResolveVarBinding();
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UINT MibStatisticsWorker();
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Revision History:
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--*/
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# include "mib.h"
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static UINT
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MibLeafFunction(
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IN OUT RFC1157VarBind * pRfcVarBinding,
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IN UINT pduAction,
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IN struct _MIB_ENTRY * pMibeCurrent,
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IN struct _MIB_ENTRIES * pMibEntries,
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IN LPVOID pStatistics
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);
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static UINT
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MibGetNextVar(
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IN OUT RFC1157VarBind * pRfcVarBinding,
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IN MIB_ENTRY * pMibeCurrent,
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IN MIB_ENTRIES * pMibEntries,
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IN LPVOID pStatistics
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);
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static VOID
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PrintAsnObjectIdentifier( IN char * pszOidDescription,
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IN AsnObjectIdentifier * pAsno)
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{
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return;
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} // PrintAsnObjectIdentifier()
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UINT
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ResolveVarBinding(
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IN OUT RFC1157VarBind * pRfcVarBinding,
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IN BYTE pduAction,
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IN LPVOID pStatistics,
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IN LPMIB_ENTRIES pMibEntries
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)
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/*++
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Description:
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This function resolves a single variable binding. Modifies the variable
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on a GET or a GET-NEXT.
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Arguments:
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pRfcVarBinding pointer to RFC Variable Bindings
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pduAction Protocol Data Unit Action specified.
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pStatistics pointer to statisitcs data structure containing
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values of counter data.
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pMibEntries pointer to MIB_ENTRIES context information
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which contains prefix, array of MIB_ENTRIES and
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count of the entries.
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Returns:
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Standard PDU error codes.
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Note:
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--*/
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{
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AsnObjectIdentifier AsnTempOid;
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LPMIB_ENTRY pMibScan;
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UINT pduResult = SNMP_ERRORSTATUS_NOERROR;
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LPMIB_ENTRY pMibUpperBound =
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pMibEntries->prgMibEntry + pMibEntries->cMibEntries;
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//
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// Search for the variable binding name in the mib.
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//
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for( pMibScan = pMibEntries->prgMibEntry;
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pMibScan < pMibUpperBound;
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pMibScan++) {
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int iCmpResult;
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//
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// Create a fully qualified OID for the current item in the MIB.
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// and use it for comparing against variable to be resolved.
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//
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SNMP_oidcpy( &AsnTempOid, pMibEntries->pOidPrefix);
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SNMP_oidappend( &AsnTempOid, &pMibScan->asnOid);
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iCmpResult = SNMP_oidcmp( &pRfcVarBinding->name, &AsnTempOid);
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SNMP_oidfree( &AsnTempOid);
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if ( iCmpResult == 0) {
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//
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// Found a match. Stop the search and process.
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//
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break;
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} else
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if ( iCmpResult < 0) {
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//
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// This could be the OID of a leaf ( withoug a trailing 0) or
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// it could contain an invalid OID ( between valid OIDs).
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//
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if ( pduAction == MIB_GETNEXT) {
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//
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// Advance the variable binding to next entry
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//
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SNMP_oidfree( &pRfcVarBinding->name);
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SNMP_oidcpy( &pRfcVarBinding->name,
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pMibEntries->pOidPrefix);
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SNMP_oidappend( &pRfcVarBinding->name, &pMibScan->asnOid);
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if ( ( pMibScan->bType != ASN_RFC1155_OPAQUE) &&
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( pMibScan->bType != ASN_SEQUENCE)) {
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pduAction = MIB_GET;
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}
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} else {
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pduResult = SNMP_ERRORSTATUS_NOSUCHNAME;
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}
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//
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// Stop and process the appropriate entry.
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//
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break;
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} // ( iCmpResult < 0)
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} // for
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if ( pMibScan >= pMibUpperBound) {
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pduResult = SNMP_ERRORSTATUS_NOSUCHNAME;
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}
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if ( pduResult == SNMP_ERRORSTATUS_NOERROR) {
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//
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// A match is found or further processing is required.
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//
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if ( pMibScan->pMibFunc == NULL) {
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//
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// This happens only if the match is for Group OID
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//
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pduResult = ( ( pduAction != MIB_GETNEXT) ?
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SNMP_ERRORSTATUS_NOSUCHNAME:
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MibGetNextVar( pRfcVarBinding,
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pMibScan,
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pMibEntries,
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pStatistics));
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} else {
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pduResult = ( pMibScan->pMibFunc) ( pRfcVarBinding,
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pduAction,
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pMibScan,
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pMibEntries,
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pStatistics);
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}
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}
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return ( pduResult);
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} // ResolveVarBinding()
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UINT
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MibStatisticsWorker(
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IN OUT RFC1157VarBind * pRfcVarBinding,
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IN UINT pduAction,
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IN struct _MIB_ENTRY * pMibeCurrent,
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IN struct _MIB_ENTRIES * pMibEntries,
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IN LPVOID pStatistics
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)
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/*++
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This function resolves the variables assuming that there is statistical
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information ( sequence of counters) in the data passed in pStatistics.
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Arguments:
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pRfcVarBind pointer to RFC variable binding to be resolved.
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pduAction protocol data unit action to be taken.
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pMibeCurrent pointer to MIB_ENTRY which is o be used for resolution.
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pMibEntries pointer to MIB_ENTRIES structure to be used
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as context for resolving and performing the action.
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pStatistics pointer to sequence of counters used for data resolution.
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Returns:
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Standard PDU error codes.
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--*/
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{
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UINT pduResult = SNMP_ERRORSTATUS_NOERROR;
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// default indicating action to be done at end of switch
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switch( pduAction) {
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case MIB_SET:
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case MIB_GETNEXT:
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// action is performed at the end of switch statement.
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break;
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case MIB_GETFIRST:
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case MIB_GET:
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//
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// If no statistics do no action.
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// If this is the header field ( non-leaf) do no action
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// Otherwise, perform action as if this is the leaf node.
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//
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if ( pStatistics == NULL || pMibeCurrent->lFieldOffset == -1) {
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pduResult = SNMP_ERRORSTATUS_GENERR;
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}
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// Action on this node is performed at the end of the switch statement.
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break;
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default:
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pduResult = SNMP_ERRORSTATUS_GENERR;
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break;
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} // switch()
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if ( pduResult == SNMP_ERRORSTATUS_NOERROR) {
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//
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// Use the generic leaf function to perform the action specified.
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//
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pduResult = MibLeafFunction( pRfcVarBinding, pduAction, pMibeCurrent,
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pMibEntries, pStatistics);
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}
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return ( pduResult);
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} // MibStatisticsWorker()
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static UINT
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MibLeafFunction(
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IN OUT RFC1157VarBind * pRfcVarBinding,
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IN UINT pduAction,
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IN struct _MIB_ENTRY * pMibeCurrent,
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IN struct _MIB_ENTRIES * pMibEntries,
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IN LPVOID pStatistics
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)
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/*++
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This function resolves the variables assuming that there is statistical
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information ( sequence of counters) in the data passed in pStatistics
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and that this is a leaf node of the MIB tree.
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This is a generic function for leaf nodes.
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Arguments:
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pRfcVarBind pointer to RFC variable binding to be resolved.
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pduAction protocol data unit action to be taken.
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pMibeCurrent pointer to MIB_ENTRY which is o be used for resolution.
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pMibEntries pointer to MIB_ENTRIES structure to be used
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as context for resolving and performing the action.
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pStatistics pointer to sequence of counters used for data resolution.
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Returns:
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Standard PDU error codes.
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--*/
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{
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UINT pduResult = SNMP_ERRORSTATUS_NOSUCHNAME; // default is error value.
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switch( pduAction ) {
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case MIB_GETNEXT:
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//
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// Determine if we're within the range and not at the end.
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// If not within the range the above default pduResult == NOSUCHNAME
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// is the required error message.
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//
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if ( ( pMibeCurrent >= pMibEntries->prgMibEntry) &&
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( pMibeCurrent <
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( pMibEntries->prgMibEntry + pMibEntries->cMibEntries))) {
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pduResult = MibGetNextVar( pRfcVarBinding,
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pMibeCurrent,
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pMibEntries,
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pStatistics);
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}
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break;
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case MIB_GETFIRST:
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case MIB_GET:
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//
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// Make sure that this variable's ACCESS is GET'able.
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// If the access prohibits from GETting it, report error as
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// NOSUCHNAME ( default value of pduResult in initialization above)
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//
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if(( pMibeCurrent->uiAccess == MIB_ACCESS_READ ) ||
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( pMibeCurrent->uiAccess == MIB_ACCESS_READWRITE ) ) {
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DWORD dwValue;
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//
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// Setup pRfcVarBinding's return value.
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//
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pRfcVarBinding->value.asnType = pMibeCurrent->bType;
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dwValue = *( (LPDWORD )((LPBYTE )pStatistics +
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pMibeCurrent->lFieldOffset));
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pduResult = SNMP_ERRORSTATUS_NOERROR; // we found a value.
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switch( pMibeCurrent->bType) {
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case ASN_RFC1155_GAUGE:
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pRfcVarBinding->value.asnValue.gauge = (AsnGauge ) dwValue;
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break;
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case ASN_RFC1155_COUNTER:
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pRfcVarBinding->value.asnValue.counter = (AsnCounter ) dwValue;
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break;
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case ASN_INTEGER:
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pRfcVarBinding->value.asnValue.number = (AsnInteger ) dwValue;
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break;
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case ASN_RFC1155_IPADDRESS:
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case ASN_OCTETSTRING:
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//
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// Not supported for this MIB (yet).
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// Fall through to indicate generic error.
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//
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default:
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//
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// Sorry! Type in Mibe does not suit our purpose.
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// Indicate generic error.
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//
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pduResult = SNMP_ERRORSTATUS_GENERR;
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break;
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} // innner switch
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} // if ( valid read access)
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break;
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case MIB_SET:
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//
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// We don't support settable variables (yet).
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// Fall through for error.
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//
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default:
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pduResult = SNMP_ERRORSTATUS_GENERR;
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break;
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} // switch ( pduAction)
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return ( pduResult);
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} // MibLeafFunction()
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static UINT
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MibGetNextVar(
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IN OUT RFC1157VarBind * pRfcVarBinding,
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IN MIB_ENTRY * pMibeCurrent,
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IN MIB_ENTRIES * pMibEntries,
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IN LPVOID pStatistics)
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/*++
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Description:
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This function sets the binding variable to iterate to the next variable.
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Arguments:
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pRfcVarBind pointer to RFC variable binding to be resolved.
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pMibeCurrent pointer to MIB_ENTRY which is o be used for resolution.
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pMibEntries pointer to MIB_ENTRIES structure to be used
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as context for resolving and performing the action.
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pStatistics pointer to sequence of counters used for data resolution.
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Returns:
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PDU Error Codes.
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--*/
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{
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UINT pduResult = SNMP_ERRORSTATUS_NOSUCHNAME;
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LPMIB_ENTRY pMibUpperBound =
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pMibEntries->prgMibEntry + pMibEntries->cMibEntries;
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//
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// If within the range of MIB ENTRIES process.
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//
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if ( pMibeCurrent >= pMibEntries->prgMibEntry) {
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//
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// Scan through the remaining MIB Entries
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//
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LPMIB_ENTRY pMibeScan;
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for( pMibeScan = pMibeCurrent+1;
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pMibeScan < pMibUpperBound;
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pMibeScan++ ) {
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//
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// Setup variable bindings for the next MIB variable
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//
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SNMP_oidfree( &pRfcVarBinding->name);
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SNMP_oidcpy( &pRfcVarBinding->name, pMibEntries->pOidPrefix);
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SNMP_oidappend( &pRfcVarBinding->name, &pMibeScan->asnOid);
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//
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// If the function pointer is not NULL and the type of the MIB
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// variable is anything but OPAQUE, then call the function to
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// process the MIB variable.
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//
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if(( pMibeScan->pMibFunc != NULL ) &&
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( pMibeScan->bType != ASN_RFC1155_OPAQUE ) ) {
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pduResult = ( pMibeScan->pMibFunc)( pRfcVarBinding,
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MIB_GETFIRST,
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pMibeScan,
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pMibEntries,
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pStatistics);
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break;
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}
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//
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// On failure in the scan, pduResult will have default value
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// as initialized above in declaration.
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//
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} // for
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}
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return ( pduResult);
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} // MibGetNextVar()
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