Folge dem Video um zu sehen, wie unsere Website als Web-App auf dem Startbildschirm installiert werden kann.
Anmerkung: Diese Funktion ist in einigen Browsern möglicherweise nicht verfügbar.
#!/usr/bin/perl -w
#
# Search arp.dat for given MAC addresses, in any format.
# 2001-12-11 Jean Delvare <delvare@ensicaen.ismra.fr>
# Change this if your data file is located elsewhere.
use constant ARP_DAT => '/usr/local/arpwatch/arp.dat';
use strict;
use vars qw(%hip %hname %hmac);
# Source looks like this: 0:2:55:90:ca:d
# We pad with 0's and strip the columns to obtain: 00025590ca0d
# Works also if padding isn't requied, and even if columns aren't present.
sub pad_mac {
my @items=split(/:/,lc($_[0]));
foreach my $cell (@items) { $cell =~ s/^(.)$/0$1/; };
return(join('',@items));
}
# Fill %hip and %hname from arp.dat.
open(ARP,ARP_DAT) || die('File not found');
while(<ARP>)
{
if(m/^\s*([\d\w:]+)\s+([\d\.]+)\s+\d+\s*([\w\d]*)/)
{
my $padded=pad_mac($1);
$hip{$padded}=$2;
$hname{$padded}=$3;
}
}
close(ARP);
if(@ARGV)
{
printf("\%-20s \%-18s \%-s\n",'MAC address','IP address','hostname');
}
else
{
printf("Usage: $0 macaddr1 [macaddr2 [macaddr3...]]\n");
}
# Fill %hmac from command line.
foreach my $item (@ARGV)
{
$hmac{$item}++;
}
foreach my $item (sort keys %hmac)
{
$item=pad_mac($item);
my $mac=$item;
$mac =~ s/..\B/$&:/g;
printf("\%-20s ",$mac);
if(defined($hip{$item}))
{
printf("\%-18s \%-s\n",$hip{$item},$hname{$item});
}
else
{
print("[never seen]\n");
}
}