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<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>2004</year><year>2013</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
The contents of this file are subject to the Erlang Public License,
Version 1.1, (the "License"); you may not use this file except in
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Software distributed under the License is distributed on an "AS IS"
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</legalnotice>
<title>snmpm_user</title>
<prepared></prepared>
<responsible></responsible>
<docno></docno>
<approved></approved>
<checked></checked>
<date></date>
<rev></rev>
<file>snmpm_user.xml</file>
</header>
<module>snmpm_user</module>
<modulesummary>Behaviour module for the SNMP manager user.</modulesummary>
<description>
<p>This module defines the behaviour of the manager user.
A <c>snmpm_user</c> compliant module
must export the following functions: </p>
<list type="bulleted">
<item>
<p>handle_error/3</p>
</item>
<item>
<p>handle_agent/4</p>
</item>
<item>
<p>handle_pdu/4</p>
</item>
<item>
<p>handle_trap/3</p>
</item>
<item>
<p>handle_inform/3</p>
</item>
<item>
<p>handle_report/3</p>
</item>
</list>
<p>The semantics of them and their exact signatures are explained
below. </p>
<p>Note that if an agent is registered using the old, no longer
documented, functions (using Addr and Port), the old variant of the
callback functions, handle_pdu, handle_trap, handle_inform and
handle_report, will be called. </p>
<marker id="handle_error"></marker>
</description>
<funcs>
<func>
<name>handle_error(ReqId, Reason, UserData) -> Reply</name>
<fsummary>Handle error</fsummary>
<type>
<v>ReqId = integer()</v>
<v>Reason = {unexpected_pdu, SnmpInfo} | {invalid_sec_info, SecInfo, SnmpInfo} | {empty_message, Addr, Port} | term()</v>
<v>Addr = ip_address()</v>
<v>Port = integer()</v>
<v>UserData = term()</v>
<v>Reply = ignore</v>
</type>
<desc>
<p>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). </p>
<p>If <c>ReqId</c> 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).
</p>
<p>For <c>SnmpInfo</c> see handle_agent below.</p>
<marker id="handle_agent"></marker>
</desc>
</func>
<func>
<name>handle_agent(Addr, Port, Type, SnmpInfo, UserData) -> Reply</name>
<fsummary>Handle agent</fsummary>
<type>
<v>Addr = ip_address()</v>
<v>Port = integer()</v>
<v>Type = pdu | trap | report | inform</v>
<v>SnmpInfo = SnmpPduInfo | SnmpTrapInfo | SnmpReportInfo | SnmpInformInfo</v>
<v>ErrorStatus = atom()</v>
<v>ErrorIndex = integer()</v>
<v>Varbinds = [varbind()]</v>
<v>varbind() = #varbind</v>
<v>UserData = term()</v>
<v>Reply = ignore | {register, UserId, TargetName, agent_info()}</v>
<v>UserId = term()</v>
<v>TargetName = target_name()</v>
<v>agent_info() = [{agent_info_item(), agent_info_value()}]</v>
</type>
<desc>
<p>This function is called when a message is received from an
unknown agent.</p>
<p>Note that this will always be the default user that is called.</p>
<p>For more info about the <c>agent_info()</c>, see
<seealso marker="snmpm#register_agent">register_agent</seealso>.</p>
<p>The arguments <c>Type</c> and <c>SnmpInfo</c> relates in the
following way: </p>
<list type="bulleted">
<item>
<p><c>pdu</c> - <c>SnmpPduInfo</c>
(see <seealso marker="#handle_pdu">handle_pdu</seealso>
for more info).</p>
</item>
<item>
<p><c>trap</c> - <c>SnmpTrapInfo</c>
(see <seealso marker="#handle_trap">handle_trap</seealso>
for more info).</p>
</item>
<item>
<p><c>report</c> - <c>SnmpReportInfo</c>
(see <seealso marker="#handle_report">handle_report</seealso>
for more info).</p>
</item>
<item>
<p><c>inform</c> - <c>SnmpInformInfo</c>
(see <seealso marker="#handle_inform">handle_inform</seealso>
for more info).</p>
</item>
</list>
<p>The only user which would return
<c>{register, UserId, TargetName, agent_info()}</c> is the
<em>default user</em>.</p>
<marker id="handle_pdu"></marker>
</desc>
</func>
<func>
<name>handle_pdu(TargetName, ReqId, SnmpPduInfo, UserData) -> Reply</name>
<fsummary>Handle the reply to an asynchronous request</fsummary>
<type>
<v>TargetName = target_name()</v>
<v>ReqId = term()</v>
<v>SnmpPduInfo = {ErrorStatus, ErrorIndex, Varbinds}</v>
<v>ErrorStatus = atom()</v>
<v>ErrorIndex = integer()</v>
<v>Varbinds = [varbind()]</v>
<v>varbind() = #varbind</v>
<v>UserData = term()</v>
<v>Reply = ignore</v>
</type>
<desc>
<p>Handle the reply to an asynchronous request, such as
<seealso marker="snmpm#async_get">async_get</seealso>,
<seealso marker="snmpm#async_get_next">async_get_next</seealso> or
<seealso marker="snmpm#async_set">async_set</seealso>.</p>
<p>It could also be a late reply to a synchronous request.</p>
<p><c>ReqId</c> is returned by the asynchronous request function.</p>
<marker id="handle_trap"></marker>
</desc>
</func>
<func>
<name>handle_trap(TargetName, SnmpTrapInfo, UserData) -> Reply</name>
<fsummary>Handle a trap/notification message</fsummary>
<type>
<v>TargetName = TargetName2 = target_name()</v>
<v>SnmpTrapInfo = {Enteprise, Generic, Spec, Timestamp, Varbinds} | {ErrorStatus, ErrorIndex, Varbinds}</v>
<v>Enterprise = oid()</v>
<v>Generic = integer()</v>
<v>Spec = integer()</v>
<v>Timestamp = integer()</v>
<v>ErrorStatus = atom()</v>
<v>ErrorIndex = integer()</v>
<v>Varbinds = [varbind()]</v>
<v>varbind() = #varbind</v>
<v>UserData = term()</v>
<v>Reply = ignore | unregister | {register, UserId, TargetName2, agent_info()}</v>
<v>UserId = term()</v>
<v>agent_info() = [{agent_info_item(), agent_info_value()}]</v>
</type>
<desc>
<p>Handle a trap/notification message from an agent.</p>
<p>For more info about the <c>agent_info()</c>, see
<seealso marker="snmpm#register_agent">register_agent</seealso></p>
<p>The only user which would return
<c>{register, UserId, TargetName2, agent_info()}</c> is the
<em>default user</em>.</p>
<marker id="handle_inform"></marker>
</desc>
</func>
<func>
<name>handle_inform(TargetName, SnmpInformInfo, UserData) -> Reply</name>
<fsummary>Handle a inform message</fsummary>
<type>
<v>TargetName = TargetName2 = target_name()</v>
<v>SnmpInformInfo = {ErrorStatus, ErrorIndex, Varbinds}</v>
<v>ErrorStatus = atom()</v>
<v>ErrorIndex = integer()</v>
<v>Varbinds = [varbind()]</v>
<v>varbind() = #varbind</v>
<v>UserData = term()</v>
<v>Reply = ignore | unregister | {register, UserId, TargetName2, agent_info()}</v>
<v>UserId = term()</v>
<v>agent_info() = [{agent_info_item(), agent_info_value()}]</v>
</type>
<desc>
<p>Handle a inform message.</p>
<p>For more info about the <c>agent_info()</c>, see
<seealso marker="snmpm#register_agent">register_agent</seealso></p>
<p>The only user which would return
<c>{register, UserId, TargetName2, agent_info()}</c> is the
<em>default user</em>.</p>
<p>If the
<seealso marker="snmp_app">inform request behaviour</seealso>
configuration option is set to <c>user</c> or
<c>{user, integer()}</c>, the response (acknowledgment) to this
inform-request will be sent when this function returns.</p>
<marker id="handle_report"></marker>
</desc>
</func>
<func>
<name>handle_report(TargetName, SnmpReportInfo, UserData) -> Reply</name>
<fsummary>Handle a report message</fsummary>
<type>
<v>TargetName = TargetName2 = target_name()</v>
<v>Addr = ip_address()</v>
<v>Port = integer()</v>
<v>SnmpReportInfo = {ErrorStatus, ErrorIndex, Varbinds}</v>
<v>ErrorStatus = atom()</v>
<v>ErrorIndex = integer()</v>
<v>Varbinds = [varbind()]</v>
<v>varbind() = #varbind</v>
<v>UserData = term()</v>
<v>Reply = ignore | unregister | {register, UserId, TargetName2, agent_info()}</v>
<v>UserId = term()</v>
<v>agent_info() = [{agent_info_item(), agent_info_value()}]</v>
</type>
<desc>
<p>Handle a report message.</p>
<p>For more info about the <c>agent_info()</c>, see
<seealso marker="snmpm#register_agent">register_agent</seealso></p>
<p>The only user which would return
<c>{register, UserId, TargetName2, agent_info()}</c> is the
<em>default user</em>.</p>
</desc>
</func>
</funcs>
</erlref>
