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|
.TH snmpm_user 3 "snmp 4.11" "Ericsson AB" "ERLANG MODULE DEFINITION"
.SH MODULE
snmpm_user \- Behaviour module for the SNMP manager user\&.
.SH DESCRIPTION
.LP
This module defines the behaviour of the manager user\&. A \fIsnmpm_user\fR compliant module must export the following functions:
.RS 2
.TP 2
*
handle_error/3
.TP 2
*
handle_agent/4
.TP 2
*
handle_pdu/5
.TP 2
*
handle_trap/4
.TP 2
*
handle_inform/4
.TP 2
*
handle_report/4
.RE
.LP
The semantics of them and their exact signatures are explained below\&.
.SH EXPORTS
.LP
.B
handle_error(ReqId, Reason, UserData) -> Reply
.br
.RS
.TP
Types
ReqId = integer()
.br
Reason = {unexpected_pdu, SnmpInfo} | {invalid_sec_info, SecInfo, SnmpInfo} | {empty_message, Addr, Port} | term()
.br
Addr = ip_address()
.br
Port = integer()
.br
UserData = term()
.br
Reply = ignore
.br
.RE
.RS
.LP
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)\&.
.LP
If \fIReqId\fR 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)\&.
.LP
For \fISnmpInfo\fR see handle_agent below\&.
.RE
.LP
.B
handle_agent(Addr, Port, SnmpInfo, UserData) -> Reply
.br
.RS
.TP
Types
Addr = ip_address()
.br
Port = integer()
.br
SnmpInfo = {ErrorStatus, ErrorIndex, Varbinds}
.br
ErrorStatus = atom()
.br
ErrorIndex = integer()
.br
Varbinds = [varbind()]
.br
varbind() = #varbind
.br
UserData = term()
.br
Reply = ignore | {register, UserId, agent_info()}
.br
UserId = term()
.br
agent_info() = [{agent_info_item(), agent_info_value()}]
.br
.RE
.RS
.LP
This function is called when a message is received from an unknown agent\&.
.LP
Note that this will always be the default user that is called\&.
.LP
For more info about the \fIagent_info()\fR, see register_agent\&.
.LP
The only user which would return \fI{register, UserId, agent_info()}\fR is the \fIdefault user\fR\&.
.RE
.LP
.B
handle_pdu(Addr, Port, ReqId, SnmpResponse, UserData) -> Reply
.br
.RS
.TP
Types
Addr = ip_address()
.br
Port = integer()
.br
ReqId = term()
.br
SnmpResponse = {ErrorStatus, ErrorIndex, Varbinds}
.br
ErrorStatus = atom()
.br
ErrorIndex = integer()
.br
Varbinds = [varbind()]
.br
varbind() = #varbind
.br
UserData = term()
.br
Reply = ignore
.br
.RE
.RS
.LP
Handle the reply to an asynchroneous request, such as ag, agn or as\&.
.LP
It could also be a late reply to a synchronous request\&.
.LP
\fIReqId\fR is returned by the asynchroneous request function\&.
.RE
.LP
.B
handle_trap(Addr, Port, SnmpTrapInfo, UserData) -> Reply
.br
.RS
.TP
Types
Addr = ip_address()
.br
Port = integer()
.br
SnmpTrapInfo = {Enteprise, Generic, Spec, Timestamp, Varbinds} | {ErrorStatus, ErrorIndex, Varbinds}
.br
Enterprise = oid()
.br
Generic = integer()
.br
Spec = integer()
.br
Timestamp = integer()
.br
ErrorStatus = atom()
.br
ErrorIndex = integer()
.br
Varbinds = [varbind()]
.br
varbind() = #varbind
.br
UserData = term()
.br
Reply = ignore | unregister | {register, UserId, agent_info()}
.br
UserId = term()
.br
agent_info() = [{agent_info_item(), agent_info_value()}]
.br
.RE
.RS
.LP
Handle a trap/notification message from an agent\&.
.LP
For more info about the \fIagent_info()\fR, see register_agent
.LP
The only user which would return \fI{register, UserId, agent_info()}\fR is the \fIdefault user\fR\&.
.RE
.LP
.B
handle_inform(Addr, Port, SnmpInfo, UserData) -> Reply
.br
.RS
.TP
Types
Addr = ip_address()
.br
Port = integer()
.br
SnmpInfo = {ErrorStatus, ErrorIndex, Varbinds}
.br
ErrorStatus = atom()
.br
ErrorIndex = integer()
.br
Varbinds = [varbind()]
.br
varbind() = #varbind
.br
UserData = term()
.br
Reply = ignore | unregister | {register, UserId, agent_info()}
.br
UserId = term()
.br
agent_info() = [{agent_info_item(), agent_info_value()}]
.br
.RE
.RS
.LP
Handle a inform message\&.
.LP
For more info about the \fIagent_info()\fR, see register_agent
.LP
The only user which would return \fI{register, UserId, agent_info()}\fR is the \fIdefault user\fR\&.
.LP
If the inform request behaviour configuration option is set to \fIuser\fR or \fI{user, integer()}\fR, the response (acknowledgment) to this inform-request will be sent when this function returnes\&.
.RE
.LP
.B
handle_report(Addr, Port, SnmpInfo, UserData) -> Reply
.br
.RS
.TP
Types
Addr = ip_address()
.br
Port = integer()
.br
SnmpInfo = {ErrorStatus, ErrorIndex, Varbinds}
.br
ErrorStatus = atom()
.br
ErrorIndex = integer()
.br
Varbinds = [varbind()]
.br
varbind() = #varbind
.br
UserData = term()
.br
Reply = ignore | unregister | {register, UserId, agent_info()}
.br
UserId = term()
.br
agent_info() = [{agent_info_item(), agent_info_value()}]
.br
.RE
.RS
.LP
Handle a report message\&.
.LP
For more info about the \fIagent_info()\fR, see register_agent
.LP
The only user which would return \fI{register, UserId, agent_info()}\fR is the \fIdefault user\fR\&.
.RE
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