Nagios Support Forum

Code: Select all

The definition in the map file is derived from what is defined in the NAGIOS-NOTIFY-MIB and NAGIOS-ROOT-MIB and dependent MIBS (SNMPv2-SMI, SNMPv2-TC) - see import sections in each MIB (extracted below)

		 =========================
		 NAGIOS-NOTIFY-MIB DEFINITIONS ::= BEGIN
		   IMPORTS
		 		 MODULE-IDENTITY, OBJECT-TYPE,  NOTIFICATION-TYPE,
		 		 Integer32
		 		   FROM SNMPv2-SMI
		 		 nagios,NotifyType,HostStateID,HostStateType,ServiceStateID
		 		   FROM NAGIOS-ROOT-MIB;
		 		   
		 -------------------->

		 NAGIOS-ROOT-MIB DEFINITIONS ::= BEGIN
		 IMPORTS
		   MODULE-IDENTITY,  enterprises 
		 		 FROM SNMPv2-SMI
		   TEXTUAL-CONVENTION
		 		 FROM SNMPv2-TC;
		 =========================

Based on MIB definitions, following CLASS mapping/definition is derived.

		 =========================
		 CLASS SNMP_nHostNotify
		 $TrapOID equals /^1\.3\.6\.1\.4\.1\.20006\.1\.6($|\.)/
		 snmpv_nHostNotifyType = GetListElem ($var, 0)
		 snmpv_nHostNotifyNum = GetListElem ($var, 1)
		 snmpv_nHostAckAuthor = GetListElem ($var, 2)
		 snmpv_nHostAckComment = GetListElem ($var, 3)
		 snmpv_nHostname = GetListElem ($var, 4)
		 snmpv_nHostStateID = GetListElem ($var, 5)
		 snmpv_nHostAttempt = GetListElem ($var, 6)
		 snmpv_nHostGroupName = GetListElem ($var, 7)
		 snmpv_nHostLastCheck = GetListElem ($var, 8)
		 snmpv_nHostLastChange = GetListElem ($var, 9)
		 snmpv_nHostOutput = GetListElem ($var, 10)
		 snmpi_nHostNotifyType = GetListElem ($idx, 0)
		 snmpi_nHostNotifyNum = GetListElem ($idx, 1)
		 snmpi_nHostAckAuthor = GetListElem ($idx, 2)
		 snmpi_nHostAckComment = GetListElem ($idx, 3)
		 snmpi_nHostname = GetListElem ($idx, 4)
		 snmpi_nHostStateID = GetListElem ($idx, 5)
		 snmpi_nHostAttempt = GetListElem ($idx, 6)
		 snmpi_nHostGroupName = GetListElem ($idx, 7)
		 snmpi_nHostLastCheck = GetListElem ($idx, 8)
		 snmpi_nHostLastChange = GetListElem ($idx, 9)
		 snmpi_nHostOutput = GetListElem ($idx, 10)
		 END
		 =========================

The "snmpv_" means value is assigned from var binding array 
		 e.g.:
		 In the below, the snmpv_nHostNotifyType slot will be assigned the value at 0 position from the array of var bindings ($var, 0)
		 		 snmpv_nHostNotifyType = GetListElem ($var, 0)

		 
The "snmpi_" means value is assigned from var binding array 
		 e.g.:
		 In the below, the snmpi_nHostNotifyType slot will be assigned the value at 0 position from the array of index ($idx, 0)
		 		 snmpi_nHostNotifyType = GetListElem ($idx, 0)


When you see "snmpi_nHostname=['__NO_INDEX__'];" - it means the index value is not there in the idx array in the trap itself.
You should see something similar to below in the mcxa.trace logs in the parsed trap.

		 =========================
		 'idx' => [
		 		 		 		 [
		 		 		 		 '__NO_INDEX__'
		 		 		 		 ],
		 		 		 		 [
		 		 		 		 '__NO_INDEX__'
		 		 		 		 ],
		 		 		 		 [
		 		 		 		 '__NO_INDEX__'
		 		 		 		 ]
		 		 		 ],
		 =========================
		 

The NAGIOS-NOTIFY-MIB suggests that their is a configuration file containing the information we do not see being passed to the map file.

nSvcHostname      OBJECT-TYPE
  SYNTAX          OCTET STRING
  MAX-ACCESS      read-only
  STATUS          current
  DESCRIPTION
    "Hostname as specified in the Nagios configuration file."
  ::= { nagiosSvcEventEntry 2 }

nSvcHostAlias     OBJECT-TYPE
  SYNTAX          OCTET STRING
  MAX-ACCESS      read-only
  STATUS          current
  DESCRIPTION
    "The host alias as specified in the Nagios configuration file"
  ::= { nagiosSvcEventEntry 3 }

Code: Select all

$trap_command = "/usr/bin/snmptrap -v 2c -c $community $tcp$address$port '' NAGIOS-NOTIFY-MIB::nHostEvent nHostname s \"%host%\" nHostStateID i %hoststateid% nHostOutput s \"%hostoutput%\"";

Code: Select all

$trap_command = "/usr/bin/snmptrap -v 2c -c $community $tcp$address$port '' NAGIOS-NOTIFY-MIB::nSvcEvent nSvcHostname s \"%host%\" nSvcDesc s \"%service%\" nSvcStateID i %servicestateid% nSvcOutput s \"%serviceoutput%\"";