# snmpm_user

### MODULE

snmpm_user

### MODULE SUMMARY

Behaviour module for the SNMP manager user.

### DESCRIPTION

This module defines the behaviour of the manager user. A snmpm_user compliant module must export the following functions:

- handle_error/3
- handle_agent/4
- handle_pdu/5
- handle_trap/4
- handle_inform/4
- handle_report/4

The semantics of them and their exact signatures are explained below.

### EXPORTS

handle_error(ReqId, Reason, UserData) -> Reply

Types:

ReqId = integer()
Reason = {unexpected_pdu, SnmpInfo} | {invalid_sec_info, SecInfo, SnmpInfo} | {empty_message, Addr, Port} | term()
Addr = ip_address()
Port = integer()
UserData = term()
Reply = ignore

This function is called when the manager needs to communicate an "asynchronous" error, to the user: e.g. failure to send an asynchronous message (i.e. encoding error), a received message was discarded due to security error, the manager failed to generate a response message to a received inform-request, or when receiving an unexpected PDU from an agent (could be an expired async request).

If ReqId is less then 0, it means that this information was not available to the manager (that info was never retrieved before the message was discarded).

For SnmpInfo see handle_agent below.

handle_agent(Addr, Port, SnmpInfo, UserData) -> Reply

Types:

Addr = ip_address()
Port = integer()
SnmpInfo = {ErrorStatus, ErrorIndex, Varbinds}
ErrorStatus = atom()
ErrorIndex = integer()
Varbinds = [varbind()]
varbind() = #varbind
UserData = term()
Reply = ignore | {register, UserId, agent_info()}
UserId = term()
agent_info() = [{agent_info_item(), agent_info_value()}]

This function is called when a message is received from an unknown agent.

Note that this will always be the default user that is called.

For more info about the agent_info(), see register_agent.

The only user which would return {register, UserId, agent_info()} is the default user.

handle_pdu(Addr, Port, ReqId, SnmpResponse, UserData) -> Reply

Types:

Addr = ip_address()
Port = integer()
ReqId = term()
SnmpResponse = {ErrorStatus, ErrorIndex, Varbinds}
ErrorStatus = atom()
ErrorIndex = integer()
Varbinds = [varbind()]
varbind() = #varbind
UserData = term()
Reply = ignore

Handle the reply to an asynchroneous request, such as ag, agn or as.

It could also be a late reply to a synchronous request.

ReqId is returned by the asynchroneous request function.

handle_trap(Addr, Port, SnmpTrapInfo, UserData) -> Reply

Types:

Addr = ip_address()
Port = integer()
SnmpTrapInfo = {Enteprise, Generic, Spec, Timestamp, Varbinds} | {ErrorStatus, ErrorIndex, Varbinds}
Enterprise = oid()
Generic = integer()
Spec = integer()
Timestamp = integer()
ErrorStatus = atom()
ErrorIndex = integer()
Varbinds = [varbind()]
varbind() = #varbind
UserData = term()
Reply = ignore | unregister | {register, UserId, agent_info()}
UserId = term()
agent_info() = [{agent_info_item(), agent_info_value()}]

Handle a trap/notification message from an agent.

For more info about the agent_info(), see register_agent

The only user which would return {register, UserId, agent_info()} is the default user.

handle_inform(Addr, Port, SnmpInfo, UserData) -> Reply

Types:

Addr = ip_address()
Port = integer()
SnmpInfo = {ErrorStatus, ErrorIndex, Varbinds}
ErrorStatus = atom()
ErrorIndex = integer()
Varbinds = [varbind()]
varbind() = #varbind
UserData = term()
Reply = ignore | unregister | {register, UserId, agent_info()}
UserId = term()
agent_info() = [{agent_info_item(), agent_info_value()}]

Handle a inform message.

For more info about the agent_info(), see register_agent

The only user which would return {register, UserId, agent_info()} is the default user.

If the inform request behaviour configuration option is set to user or {user, integer()}, the response (acknowledgment) to this inform-request will be sent when this function returnes.

handle_report(Addr, Port, SnmpInfo, UserData) -> Reply

Types:

Addr = ip_address()
Port = integer()
SnmpInfo = {ErrorStatus, ErrorIndex, Varbinds}
ErrorStatus = atom()
ErrorIndex = integer()
Varbinds = [varbind()]
varbind() = #varbind
UserData = term()
Reply = ignore | unregister | {register, UserId, agent_info()}
UserId = term()
agent_info() = [{agent_info_item(), agent_info_value()}]

Handle a report message.

For more info about the agent_info(), see register_agent

The only user which would return {register, UserId, agent_info()} is the default user.

snmp 4.11
Copyright © 1991-2008 Ericsson AB