Re: Net-SNMP AgentX - Problem with new MIB and snmpset

Hi,
I have not received yet any reply.
Please, may you keep in consideration my request?
I am registered on SourgeForce site, is there any action I have to take?
Thank you

BR
Simone

Il giorno gio 22 apr 2021 alle ore 13:14 Simone Moni <[email protected]>
ha scritto:

> Hi all,
> I'm a newbie with AgentX. I need to extend snmpd with a new custom MIB
> module.
> I have NET-SNMP version 5.5 on Redhat, I would implement perl API, using
> NetSNMP::agent.
> Hereby, the steps I've done:
>
> - /etc/snmp/snmpd.conf
> #sec.name              source        community
> com2sec notConfigUser  default       public
> #groupName              securityModel securityName
> group   notConfigGroup  v1            notConfigUser
> group   notConfigGroup  v2c           notConfigUser
> #name           incl/excl     subtree         mask(optional)
> view all        included      .1
> #group               context sec.model sec.level prefix   read write  notif
> access  notConfigGroup ""      any       noauth    exact  all   all   none
> master    agentx
>
> - MIB module
> My custom MIB is related to an active alarms table for fault management.
> It must be queryable from an external management station.
> The MIB file (ACM-LOGWATCH-MIB) is located in /usr/share/snmp/mibs
> directory.
>
> Here the subset for Table:
>
> acmLogWatchTable OBJECT-TYPE
>     SYNTAX      SEQUENCE OF acmLogWatchEntry
>     MAX-ACCESS  read-only
>     STATUS      current
>     DESCRIPTION
>         "Table of objects"
>     ::= { acmLogWatch 10 }
>
> acmLogWatchEntry OBJECT-TYPE
>     SYNTAX      acmLogWatchEntry
>     MAX-ACCESS  read-only
>     STATUS      current
>     DESCRIPTION
>         ""
>     INDEX   { acmLogWatchIndex }
>     ::= { acmLogWatchTable 1 }
>
> acmLogWatchEntry ::= SEQUENCE {
>     acmLogWatchIndex                   Integer32,
>     acmLogWatchSpecificProblem         DisplayString,
>     acmLogWatchProbableCause           DisplayString,
> }
>
> acmLogWatchIndex OBJECT-TYPE
>                                 SYNTAX  INTEGER
>                                 ACCESS  read-only
>                                 STATUS  mandatory
>                                 DESCRIPTION
>                                 "A unique value for each active alarm"
>                                 ::= { acmLogWatchEntry 1 }
>
> acmLogWatchSpecificProblem              OBJECT-TYPE
>                                 SYNTAX      DisplayString
>                                 MAX-ACCESS  read-write
>                                 STATUS      current
>                                 DESCRIPTION
>                                 "the specific problem of the alarm"
>                                 ::= { acmLogWatchEntry 2 }
>
> acmLogWatchProbableCause                OBJECT-TYPE
>                                 SYNTAX      DisplayString
>                                 MAX-ACCESS  read-write
>                                 STATUS      current
>                                 DESCRIPTION
>                                 "the probable cause of the alarm"
>                                 ::= { acmLogWatchEntry 3 }
>
> snmpset is used to set OID's Values.
>
> - perl code:
>
> use NetSNMP::agent (':all');
> use NetSNMP::ASN (':all');
> use NetSNMP::OID(':all');
>
> my $default_SP = "SP 1";
> my $default_PC = "PC 1";
>
> sub myhandler {
>     my ($handler, $registration_info, $request_info, $requests) = @_;
>         my $request;
>
>     for($request = $requests; $request; $request = $request->next()) {
>         my $oid = $request->getOID();
>         if ($request_info->getMode() == MODE_GET) {
>             # ... generally, you would calculate value from oid
>             if ($oid == new
> NetSNMP::OID(".1.3.6.1.4.1.193.37.10.11.64.10.1.2.0")) {
>             $request->setValue(ASN_OCTET_STR, $default_SP);
>             }
>             if ($oid == new
> NetSNMP::OID(".1.3.6.1.4.1.193.37.10.11.64.10.1.3.0")) {
>             $request->setValue(ASN_OCTET_STR, $default_PC);
>             }
>         } elsif ($request_info->getMode() == MODE_GETNEXT) {
>             # ... generally, you would calculate value from oid
>             if ( $oid < new
> NetSNMP::OID(".1.3.6.1.4.1.193.37.10.11.64.10.1.2.0")) {
>             $request->setOID(".1.3.6.1.4.1.193.37.10.11.64.10.1.2.0");
>             $request->setValue(ASN_OCTET_STR, $default_SP);
>             $request->setOID(".1.3.6.1.4.1.193.37.10.11.64.10.1.3.0");
>             $request->setValue(ASN_OCTET_STR, $default_PC);
>             }
>         } elsif ($request_info->getMode() == MODE_SET_RESERVE1) {
>             if ( ( $oid != new
> NetSNMP::OID(".1.3.6.1.4.1.193.37.10.11.64.10.1.2.0")) and ( $oid != new
> NetSNMP::OID(".1.3.6.1.4.1.193.37.10.11.64.10.1.3.0")) ) {  # do error
> checking here
>             $request->setError($request_info, SNMP_ERR_NOSUCHNAME);
>             }
>         } elsif ($request_info->getMode() == MODE_SET_ACTION) {
>             # ... (or use the value)
>             $value = $request->getValue();
>         }
>     }
>
> }
>
> my $agent = new NetSNMP::agent(
>     # makes the agent read a my_agent_name.conf file
>     'Name' => "my_agent_name",
>     'AgentX' => 1
>     );
> $agent->register("my_agent_name", ".1.3.6.1.4.1.193.37.10.11.64.10",
>     \&myhandler);
>
> my $running = 1;
> while($running) {
>     $agent->agent_check_and_process(1);
> }
>
> $agent->shutdown();
>
> Results:
>
> # snmpget -v2c -c public localhost .1.3.6.1.4.1.193.37.10.11.64.10.1.2.0
> ACM-LOGWATCH-MIB::acmLogWatchSpecificProblem.0 = STRING: SP 1
> # snmpget -v2c -c public localhost .1.3.6.1.4.1.193.37.10.11.64.10.1.3.0
> ACM-LOGWATCH-MIB::acmLogWatchProbableCause.0 = STRING: PC 1
>
> SNMPWALK doesn't show all the OID's set, but last one:
> # snmpwalk -v2c -c public localhost .1.3.6.1.4.1.193.37.10.11.64.10
> ACM-LOGWATCH-MIB::acmLogWatchProbableCause.0 = STRING: PC 1
>
> SNMPSET doesn't work:
> [root@redhatgp ACM]# snmpset -v2c -c public localhost
> .1.3.6.1.4.1.193.37.10.11.64.10.1.3.0 s "PC 2"
> ACM-LOGWATCH-MIB::acmLogWatchProbableCause.0 = STRING: PC 2
> [root@redhatgp ACM]# snmpget -v2c -c public localhost
> .1.3.6.1.4.1.193.37.10.11.64.10.1.3.0
> ACM-LOGWATCH-MIB::acmLogWatchProbableCause.0 = STRING: PC 1
>
> Can anyone help me?
>
> Thanks
> Simone
>
>
>

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