If a handler function does not return anything appropriate or even nothing at all, a return value of NETSNMPTRAPD_HANDLER_OK is assumed. Stops searching for further appropriate handlers. Stops evaluating the list of handlers for this specific trap, but lets the snmptrapd demon apply global handlers. Handling the trap failed, but lets the snmptrapd demon check for further appropriate handlers. Handling the trap succeeded, but lets the snmptrapd demon check for further appropriate handlers.
Registered functions should return one of the following values: NETSNMPTRAPD_HANDLER_OK Each variable is itself a reference to an array containing three values: a NetSNMP::OID object, the value that came associated with it, and the value's numeric type (see NetSNMP::ASN for further details on SNMP typing information). The second argument is a reference to an array containing the variable bindings (OID and value information) that define the noification itself. The first is a reference to a hash containing information about how the trap was received (what version of the SNMP protocol was used, where it came from, what SNMP user name or community name it was sent under, etc). Registered functions are called with 2 arguments.
Within the nf file, the keyword "perl" may be used to call any perl expression and using this ability, you can use the NetSNMP::TrapReceiver module to register functions which will be called every time a given notification (a trap or an inform) is received. It is intended solely for embedded use within the snmptrapd demon. This module can NOT be used in a normal perl script to receive traps. Registration of functions is then done through the nf configuration file. Net-SNMP MUST have been configured using -enable-embedded-perl. The NetSNMP::TrapReceiver module is used to register perl subroutines into the Net-SNMP snmptrapd process. Put the following lines in your nf file: perl NetSNMP::TrapReceiver::register("trapOID", \&myfunc) ABSTRACT
NetSNMP::TrapReceiver - Embedded perl trap handling for Net-SNMP's snmptrapd SYNOPSIS
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