How To Programmatically Trigger a SNMP Trap (189131)

MORE INFORMATION

1. Modify Testdll.dll SNMP extension agent sample located in \Mssdk\Samples\Netds\Snmp\Testdll of the Platform SDK by replacing SnmpExtensionInit() entry point in file Testdll.c with the following code:

         BOOL WINAPI SnmpExtensionInit(
             IN  DWORD               dwTimeZeroReference,
             OUT HANDLE              *hPollForTrapEvent,
             OUT AsnObjectIdentifier *supportedView)
         {
             SECURITY_ATTRIBUTES sa;
             SECURITY_DESCRIPTOR sd;
   
             sa.nLength = sizeof(SECURITY_ATTRIBUTES);
             sa.bInheritHandle = TRUE;
             sa.lpSecurityDescriptor = &sd;
   
             if(!InitializeSecurityDescriptor(&sd,
                                              SECURITY_DESCRIPTOR_REVISION))
                 return FALSE;   // Handle errors.
   
             // Add a NULL DACL to the security descriptor.
             if(!SetSecurityDescriptorDacl(&sd, TRUE, (PACL)NULL, FALSE))
                 return FALSE;   // Handle errors.
   
             // Record the time reference provided by the Extendible Agent.
   
             dwTimeZero = dwTimeZeroReference;
   
   
             // Create a named Event that will be used to communicate the
             // occurrence of traps to the Extendible Agent. The Extension
             // Agent will assert this Event when a trap has occurred. This
             // is explained later.
   
             // A named event is created with a null DACL such that other
             // processes are able to signal this Event as this Extension
             // agent does.
   
           if ((*hPollForTrapEvent =
                CreateEvent(&sa, FALSE, FALSE, TEXT("_MyTrapEvent"))) == NULL)
             {
                 // Indicate error?, be sure that NULL is returned to
                 // Extendible Agent.
             }
   
             // Indicate the MIB view supported by this Extension Agent, an
             // object identifier representing the sub root of the MIB that
             // is supported.
   
             *supportedView = MIB_OidPrefix; // NOTE!  structure copy
   
   
             // Record the trap Event. This example Extension Agent
             // simulates traps by generating a trap after every given number
             // of processed requests.
   
             hSimulateTrap = *hPollForTrapEvent;
   
   
             // Indicate that Extension Agent initialization was successful.
   
             return TRUE;
   
         } // end SnmpExtensionInit().
   						

2. You can use the following small program to test the trigger of trap event:

         #include <windows.h>
         #include <stdio.h>
   
         void main(void)
         {
             HANDLE hTrapEvent;
             char c;
   
             hTrapEvent = OpenEvent(EVENT_MODIFY_STATE, FALSE,
                                    TEXT("_MyTrapEvent"));
             if (hTrapEvent == NULL)
             {
                 printf(TEXT("Can't open the event _MyTrapEvent\n"));
                 return;
             }
             printf(TEXT("Hit t [enter] to trigger the sending of trap: \n"));
             while (1)
             {
                 scanf("%c", &c);
                 if (c == 't' || c == 'T')
                     SetEvent(hTrapEvent);
             }
         }