snmpa_discovery_handler
Module
snmpa_discovery_handler
Module Summary
Behaviour module for the SNMP agent discovery handler.
Description
This module defines the behaviour of the agent discovery handler. A snmpa_discovery_handler
compliant module must export the following functions:
The semantics of them and their exact signatures are explained below.
Exports
stage1_finish(TargetName, ManagerEngineID, ExtraInfo) -> ignore | {ok, usm_entry() | [usm_entry()]} | {ok, usm_entry() | [usm_entry()], NewExtraInfo} |
Types
This function is called at the end of stage 1 of the discovery process. It should return either the atom ignore
or {ok, usm_entry() | [usm_entry()]}
. See usm_entry()
and usm_entry/13
for more info.
If the function returns ignore
, then it is assumed that either:
- The caller (of the discovery function) will make the needed updates later.
- The callback function itself did the updates.
In either case, the agent will do nothing, but return the retrieved ManagerEngineID (see discovery
for more info) and possible continue with stage 2 of the discovery process.
The ExtraInfo
argument is passed on from the discovery
function.
This function may return an updated NewExtraInfo
that will be used in subsequent calls to the callback functions. Intended for future use.
The purpose of this function is to generate the usm- related security data needed for usm processing in the agent. Specifically, updating the usmUserTable.
When an usm_entry()
tuple (or a list of such tuples) is returned, this data is then added to the usmUserTable
by the (master-) agent.
When an usm_entry()
tuple (or a list of such tuples) is returned, this data is then added to the usmUserTable
by the (master-) agent.
Note that the function does not check if this entry already exists.
Note that this function is executed in the context of the master-agent process.
© 2010–2020 Ericsson AB
Licensed under the Apache License, Version 2.0.