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#!/usr/bin/perl
use strict;
use warnings;
use Sys::Syslog qw(openlog syslog closelog LOG_NOTICE);
my $delay = 5;
my $wakeuplist = "/etc/shutdown-at-night/clients";
my $wakeupgenerator = "/etc/shutdown-at-night/clients-generator";
my %hwaddrs;
sub load_clients {
my $fh = shift;
while (<$fh>) {
chomp;
my ($ip, $hwaddr) = split(/\s+/);
$hwaddrs{$ip} = $hwaddr;
}
}
# Locate hosts to wake up, from file
if ( -f $wakeuplist ) {
if (open(CLIENTS, "<", $wakeuplist)) {
load_clients(*CLIENTS);
close(CLIENTS);
}
}
# Or using a dynamic script
if ( -x $wakeupgenerator ) {
if (open(CLIENTS, "$wakeupgenerator |")) {
load_clients(*CLIENTS);
close(CLIENTS);
}
}
my %alive;
map { $alive{$_} = 1; } get_alive_list(keys %hwaddrs);
# Calculate when to start, assuming 20-30 seconds between each host
#my $duration = $delay * scalar keys %hwaddrs;
#my $allup = time();
# Start sending wakeup calls
for my $ip (sort keys %hwaddrs) {
if (! defined $alive{$ip}) {
logmsg("sending wake-on-lan to $ip [$hwaddrs{$ip}]");
wakeup($ip, $hwaddrs{$ip});
sleep $delay;
} else {
logmsg("not sending wake-on-lan to already awake $ip [$hwaddrs{$ip}]");
}
}
# exit
exit 0;
sub wakeup {
my ($ip, $hwaddr) = @_;
`wakeonlan -i $ip $hwaddr`;
}
sub get_alive_list {
my @addresses = @_;
return split(/\s+/, `fping -a @addresses`);
}
sub logmsg {
my $msg = shift;
openlog("wakeupclients", undef, 'user');
syslog(LOG_NOTICE, "%s", $msg);
closelog;
}
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