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<?xml version="1.0" encoding="utf-8" ?>
<!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
compliance with the License. You should have received a copy of the
Erlang Public License along with this software. If not, it can be
retrieved online at http://www.erlang.org/.
Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
the License for the specific language governing rights and limitations
under the License.
</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>
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