Source Perl de Wake-On-Lan
wakeonlan.pl
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text/x-perl,
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#!/usr/bin/perl -w
#
# $Id: wakeonlan,v 1.4.2.3 2005/01/27 16:03:54 jpo Exp $
#
#########################################################################
use strict;
use Net::hostent;
use Socket;
use Getopt::Std;
use vars qw($VERSION $opt_v $opt_h $opt_i $opt_p $opt_f);
$VERSION = '0.41';
my $DEFAULT_IP = '255.255.255.255';
my $DEFAULT_PORT = getservbyname('discard', 'udp');
#
# Process the command line
#
getopts("hvp:i:f:");
if ($opt_h) { usage(); exit(0); }
if ($opt_v) { print "wakeonlan version $VERSION\n"; exit(0); }
if (!$opt_f and !@ARGV) { usage(); exit(0); }
if ($opt_i) { $DEFAULT_IP = $opt_i; } # override default value
if ($opt_p) { $DEFAULT_PORT = $opt_p; } # override default value
if ($opt_f) { process_file($opt_f); }
# The rest of the command line is a list of hardware addresses
foreach (@ARGV) {
wake($_, $opt_i, $opt_p);
}
#
# wake
#
# The 'magic packet' consists of 6 times 0xFF followed by 16 times
# the hardware address of the NIC. This sequence can be encapsulated
# in any kind of packet, in this case an UDP packet targeted at the
# discard port (9).
#
sub wake
{
my $host = shift;
my $ipaddr = shift || $DEFAULT_IP;
my $port = shift || $DEFAULT_PORT;
my ($raddr, $them, $proto);
my ($hwaddr, $hwaddr_re, $pkt);
# get the hardware address (ethernet address)
$hwaddr_re = join(':', ('[0-9A-Fa-f]{1,2}') x 6);
if ($host =~ m/^$hwaddr_re$/) {
$hwaddr = $host;
} else {
# $host is not a hardware address, try to resolve it
my $ip_re = join('\.', ('([0-9]|[1-9][0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))') x 4);
my $ip_addr;
if ($host =~ m/^$ip_re$/) {
$ip_addr = $host;
} else {
my $h;
unless ($h = gethost($host)) {
warn "$host is not a hardware address and I could not resolve it as to an IP address.\n";
return undef;
}
$ip_addr = inet_ntoa($h->addr);
}
# look up ip in /etc/ethers
unless (open (ETHERS, '<', '/etc/ethers')) {
warn "$host is not a hardware address and I could not open /etc/ethers.\n";
return undef;
}
while (<ETHERS>) {
if (($_ !~ m/^$/) && ($_ !~ m/^#/)) { # ignore comments
my ($mac, $ip);
($mac, $ip) = split(' ', $_, 3);
if ($ip =~ m/^$ip$/) {
if ($ip eq $ip_addr or $ip eq $host) {
$hwaddr = $mac;
last;
}
next;
} else {
my $h2;
unless ($h2 = gethost($ip)) {
next;
}
if (inet_ntoa($h2->addr) eq $ip_addr) {
$hwaddr = $mac;
last;
}
}
}
}
close (ETHERS);
unless (defined($hwaddr)) {
warn "Could not find $host in /etc/ethers\n";
return undef;
}
}
# Generate magic sequence
foreach (split /:/, $hwaddr) {
$pkt .= chr(hex($_));
}
$pkt = chr(0xFF) x 6 . $pkt x 16;
# Allocate socket and send packet
$raddr = gethostbyname($ipaddr)->addr;
$them = pack_sockaddr_in($port, $raddr);
$proto = getprotobyname('udp');
socket(S, AF_INET, SOCK_DGRAM, $proto) or die "socket : $!";
setsockopt(S, SOL_SOCKET, SO_BROADCAST, 1) or die "setsockopt : $!";
print "Sending magic packet to $ipaddr:$port with $hwaddr\n";
send(S, $pkt, 0, $them) or die "send : $!";
close S;
}
#
# process_file
#
sub process_file {
my $filename = shift;
my ($hwaddr, $ipaddr, $port);
open (F, "<$filename") or die "open : $!";
while(<F>) {
next if /^\s*#/; # ignore comments
next if /^\s*$/; # ignore empty lines
chomp;
($hwaddr, $ipaddr, $port) = split;
wake($hwaddr, $ipaddr, $port);
}
close F;
}
#
# Usage
#
sub usage {
print <<__USAGE__;
Usage
wakeonlan [-h] [-v] [-i IP_address] [-p port] [-f file] [[hardware_address] ...]
Options
-h
this information
-v
displays the script version
-i ip_address
set the destination IP address
default: 255.255.255.255 (the limited broadcast address)
-p port
set the destination port
default: 9 (the discard port)
-f file
uses file as a source of hardware addresses
See also
wakeonlan(1)
__USAGE__
}
__END__
# Script documentation
=head1 NAME
wakeonlan - Perl script to wake up computers
=head1 SYNOPSIS
wakeonlan [-h] [-v] [-i IP_address] [-p port] [-f file] [[hardware_address] ...]
=head1 DESCRIPTION
This script sends 'magic packets' to wake-on-lan enabled ethernet adapters and motherboards, in order to switch on the called PC. Be sure to connect the NIC with the motherboard if neccesary, and enable the WOL function in the BIOS.
The 'magic packet' consists of 6 times 0xFF followed by 16 times the hardware address of the NIC. This sequence can be encapsulated in any kind of packet. This script uses UDP packets.
=head1 OPTIONS
=over
=item B<-h>
Displays the help information.
=item B<-v>
Displays the script version.
=item B<-i ip_address>
Destination IP address. Unless you have static ARP tables you should
use some kind of broadcast address (the broadcast address of the network where the computer resides or the limited broadcast address). Default: 255.255.255.255 (the limited broadcast address).
=item B<-p port>
Destination port. Default: 9 (the discard port).
=item B<-f file>
File with hardware addresses of wakeable computers. For an example check
the file lab001.wol in the examples subdirectory.
=back
=head1 EXAMPLES
Using the limited broadcast address (255.255.255.255):
$ wakeonlan 01:02:03:04:05:06
$ wakeonlan 01:02:03:04:05:06 01:02:03:04:05:07
Using a subnet broadcast address:
$ wakeonlan -i 192.168.1.255 01:02:03:04:05:06
Using another destination port:
$ wakeonlan -i 192.168.1.255 -p 1234 01:02:03:04:05:06
Using a file as source of hardware and IP addresses:
$ wakeonlan -f examples/lab001.wol
$ wakeonlan -f examples/lab001.wol 01:02:03:04:05:06
=head1 AUTHOR
Jos� Pedro Oliveira <jpo@di.uminho.pt> maintaining and expanding original work done by Ico Doornekamp <ico@edd.dhs.org>.
=head1 COPYRIGHT
Copyright (c) 2000-2005 Jos� Pedro Oliveira.
This is free software. You may modify it and distribute it under Perl's Artistic Licence. Modified versions must be clearly indicated.
=head1 SEE ALSO
For more information regarding this script and Wakeonlan technology just check the following address http://gsd.di.uminho.pt/jpo/software/wakeonlan/.
=cut