Hello!
There is a need to return the value of the ip address when requesting a
specific OID.
It is necessary to emulate the snmp device.
Implemented via perl, which I am new to.
Perl extension NetSNMP::ASN does not return values in the request, where
Exportable constants - ASN_IPADDRESS, but return values other any types is
very good!
Why?
1. If in the file - my $string_ASN = ASN_OCTET_STR;
# snmpget -c public -v 1 192.168.3.102 1.3.6.1.4.1.318.2.1.2.1.2.1
Iso.1.3.6.1.4.1.318.2.1.2.1.2.1 = STRING: "192.168.3.7"
2. If in the file - my $string_ASN = ASN_IPADDRESS;
#snmpget -c public -v 1 192.168.3.102 1.3.6.1.4.1.318.2.1.2.1.2.1
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: iso.1.3.6.1.4.1.318.2.1.2.1.2.1
But
#systemctl status snmpd (p.#2)
snmpd.service - Simple Network Management Protocol (SNMP) Daemon.
Loaded: loaded (/lib/systemd/system/snmpd.service; enabled; vendor
preset: enabled)
Active: active (running) since Fri 2020-09-11 14:24:24 MSK; 5min ago
Process: 30895 ExecStartPre=/bin/mkdir -p /var/run/agentx (code=exited,
status=0/SUCCESS)
Main PID: 30905 (snmpd)
Tasks: 1 (limit: 1075)
Memory: 19.6M
CGroup: /system.slice/snmpd.service
L-30905 /usr/sbin/snmpd -LOw -u Debian-snmp -g Debian-snmp -I
-smux mteTrigger mteTriggerConf -f -p /run/snmpd.pid
Sep 11 14:24:24 snmpd systemd[1]: Starting Simple Network Management
Protocol (SNMP) Daemon....
Sep 11 14:24:24 snmpd systemd[1]: Started Simple Network Management Protocol
(SNMP) Daemon..
Sep 11 14:24:26 snmpd snmpd[30905]: IP address of 11 bytes passed to
setValue with ASN_IPADDRESS
Why isn't the ip address returned? How to correctly assign ip address in
perl for ASN_IPADDRESS?
Where is my mistake? Please tell me.
Thanks.
--- code ---
Enable the file in snmpd.conf:
perl do "/usr/share/snmp/2.1.2.1.pl";
Example my 2.1.2.1.pl.pl file :
#!/usr/bin/perl
use NetSNMP::agent (':all');
use NetSNMP::ASN qw(ASN_IPADDRESS ASN_OCTET_STR);
sub hello_handler {
my ($handler, $registration_info, $request_info, $requests) = @_;
my $request;
my $string_value = "192.168.3.7";
my $string_ASN = ASN_OCTET_STR;
#my $string_ASN = ASN_IPADDRESS;
for($request = $requests; $request; $request = $request->next()) {
my $oid = $request->getOID();
if ($request_info->getMode() == MODE_GET) {
if ($oid == new NetSNMP::OID(".1.3.6.1.4.1.318.2.1.2.1.2.1")) {
$request->setValue($string_ASN, ($string_value));
}
elsif ($oid == new NetSNMP::OID(".1.3.6.1.4.1.318.2.1.2.1.2.1")) {
$request->setValue($string_ASN, ($string_value));
}
} elsif ($request_info->getMode() == MODE_GETNEXT) {
if ($oid == new NetSNMP::OID(".1.3.6.1.4.1.318.2.1.2.1.2.1")) {
$request->setOID(".1.3.6.1.4.1.318.2.1.2.1.2.2");
$request->setValue($string_ASN, ($string_value));
}
elsif ($oid < new NetSNMP::OID(".1.3.6.1.4.1.318.2.1.2.1.2.1")) {
$request->setOID(".1.3.6.1.4.1.318.2.1.2.1.2.1");
$request->setValue($string_ASN, ($string_value));
}
}
}
}
my $agent = new NetSNMP::agent();
$agent->register(".1.3.6.1.4.1.318.2.1.2.1.2.1",
".1.3.6.1.4.1.318.2.1.2.1.2.1",
\&hello_handler);
P.S. My task is to return the address of the computer that makes the request
for this OID. But at least just returned an arbitrary address!
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