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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>2004</year><year>2016</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
</legalnotice>
<title>snmpa_discovery_handler</title>
<prepared></prepared>
<responsible></responsible>
<docno></docno>
<approved></approved>
<checked></checked>
<date></date>
<rev></rev>
<file>snmpa_discovery_handler.xml</file>
</header>
<module>snmpa_discovery_handler</module>
<modulesummary>Behaviour module for the SNMP agent discovery handler.</modulesummary>
<description>
<p>This module defines the behaviour of the agent discovery
handler. A <c>snmpa_discovery_handler</c> compliant module
must export the following functions: </p>
<list type="bulleted">
<item>
<p><seealso marker="#stage1_finish">stage1_finish/2</seealso></p>
</item>
</list>
<p>The semantics of them and their exact signatures are explained
below. </p>
<marker id="stage1_finish"></marker>
</description>
<funcs>
<func>
<name>stage1_finish(TargetName, ManagerEngineID, ExtraInfo) -> ignore | {ok, usm_entry() | [usm_entry()]} | {ok, usm_entry() | [usm_entry()], NewExtraInfo}</name>
<fsummary>Discovery stage 1 finish</fsummary>
<type>
<v>TargetName = string()</v>
<v>ManagerEngineID = string()</v>
<v>ExtraInfo = term()</v>
<v>usm_entry() = tuple() compatible with usm.conf</v>
<v>NewExtraInfo = term()</v>
</type>
<desc>
<p>This function is called at the end of stage 1 of the
discovery process. It should return either the atom
<c>ignore</c> or <c>{ok, usm_entry() | [usm_entry()]}</c>. See
<seealso marker="snmp_agent_config_files#usm">usm_entry()</seealso>
and
<seealso marker="snmpa_conf#usm_entry">usm_entry/13</seealso>
for more info. </p>
<p>If the function returns <c>ignore</c>, then it is assumed that
either: </p>
<list type="bulleted">
<item>The caller (of the discovery function) will make the
needed updates later. </item>
<item>The callback function itself did the updates. </item>
</list>
<p>In either case, the agent will do nothing, but return
the retrieved ManagerEngineID (see
<seealso marker="snmpa#discovery">discovery</seealso>
for more info) and possible continue with stage 2 of
the discovery process. </p>
<p>The <c>ExtraInfo</c> argument is passed on from the
<seealso marker="snmpa#discovery">discovery</seealso>
function. </p>
<p>This function may return an updated <c>NewExtraInfo</c>
that will be used in subsequent calls to the callback
functions. Intended for future use. </p>
<p>The purpose of this function is to generate the usm-
related security data needed for usm processing in the
agent. Specifically, updating the usmUserTable. </p>
<p>When an <c>usm_entry()</c> tuple (or a list of such
tuples) is returned, this data is then added to the
<c>usmUserTable</c> by the (master-) agent. </p>
<p>When an <c>usm_entry()</c> tuple (or a list of such
tuples) is returned, this data is then added to the
<c>usmUserTable</c> by the (master-) agent. </p>
<note><p>Note that the function does not check if this entry
already exists. </p></note>
<note><p>Note that this function is executed in the context of
the master-agent process. </p></note>
</desc>
</func>
</funcs>
</erlref>
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