Perl script feeding the ifAlias table
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#!/usr/bin/perl -w
# SNMP::Extension::PassPersist is required.
# This is in the package libsnmp-extension-passpersist-perl on Debian and
# Ubuntu
# And in the package dev-perl/SNMP-Extension-PassPersist from
# https://git.grifon.fr/alarig/SwordArMor-gentoo-overlay.git overlay
# Usage : Copy the script to /usr/local/bin/ifAlias_persist and add to
# /etc/snmp/snmpd.conf
# pass_persist .1.3.6.1.2.1.31.1.1.1.18 /usr/local/bin/ifAlias_persist
use strict;
use SNMP::Extension::PassPersist;
# create the object
my $extsnmp = SNMP::Extension::PassPersist->new(
backend_collect => \&update_tree,
idle_count => 10, # no more than 10 idle cycles
refresh => 60, # refresh every 60 sec
);
# run the program
$extsnmp->run;
sub update_tree {
my ($self) = @_;
my $Base = ".1.3.6.1.2.1.31.1.1.1.18";
# get the interfaces
my @iface_list = `ip l | grep mtu | cut -d @ -f 1`;
my $type = "string";
foreach my $row (@iface_list){
my @split = split(": ", $row);
# remove a possible \n
$split[1] =~ s/\R//g;
# cat the file
my $filename = "/sys/class/net/$split[1]/ifalias";
open(my $fh, '<:encoding(UTF-8)', $filename)
or die "Could not open file '$filename' $!";
# fill the OID with the content
while (my $desc = <$fh>) {
chomp $desc;
my ($key, $value) = ("$Base.$split[0]",$desc);
$self->add_oid_entry($key,$type,$value);
}
close $fh;
}
}