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package Net::Wake; |
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1069
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use strict; |
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use IO::Socket; |
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use vars qw($VERSION); |
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$VERSION = '0.02'; |
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=head1 NAME |
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Net::Wake - A package to send packets to power on computers. |
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=head1 SYNOPSIS |
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To send a wake-on-lan packet via UDP: |
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Net::Wake::by_udp('255.255.255.255', '00:00:87:A0:8A:D2'); |
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Or directly from the command line: |
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perl -MNet::Wake -e "Net::Wake::by_udp(undef,'00:00:87:A0:8A:D2')" |
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=head1 DESCRIPTION |
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This package sends wake-on-lan (AKA magic) packets to turn on machines that |
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are wake-on-lan capable. |
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For now there is only one function in this package: |
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Net::Wake::by_udp([$host], $mac_address, [$port]); |
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You can omit the colons in the $mac_address, but not leading zeros. |
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Generally speaking, you should use a broadcast address for $host. |
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Using the host's last known IP address is usually not sufficient |
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since the IP address may no longer be in the ARP cache. |
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A $host value of '255.255.255.255' is implied if $host is undef. |
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If you wish to send a magic packet to a remote subnet, |
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you can use a variation of '192.168.0.255', given that you know |
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the subnet mask to generate the proper broadcast address. |
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=head1 SEE ALSO |
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http://gsd.di.uminho.pt/jpo/software/wakeonlan/mini-howto/ |
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=head1 COPYRIGHT |
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Copyright 1999-2003 Clinton Wong |
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This program is free software; you can redistribute it |
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and/or modify it under the same terms as Perl itself. |
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=cut |
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sub by_udp { |
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my ($host, $mac_addr, $port) = @_; |
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# use the discard service if $port not passed in |
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if (! defined $host) { $host = '255.255.255.255' } |
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if (! defined $port || $port !~ /^\d+$/ ) { $port = 9 } |
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60
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61
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my $sock = new IO::Socket::INET(Proto=>'udp') || return undef; |
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0
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my $ip_addr = inet_aton($host); |
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0
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my $sock_addr = sockaddr_in($port, $ip_addr); |
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0
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$mac_addr =~ s/://g; |
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0
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my $packet = pack('C6H*', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, $mac_addr x 16); |
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0
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setsockopt($sock, SOL_SOCKET, SO_BROADCAST, 1); |
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send($sock, $packet, 0, $sock_addr); |
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0
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close ($sock); |
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0
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return 1; |
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} |
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75
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1; |
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