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Implemented getaddrinfo to resolve domain names and to support IPv6 #4

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58ebb57
Implemented getaddrinfo to resolve domain names and to support IPv6
Jun 20, 2020
ee3b7c5
enable SO_BROADCAST on the socket
Jun 20, 2020
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105 changes: 66 additions & 39 deletions wakeonlan
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,9 @@
######################################################################

use strict;
use Socket;
use IO::Socket::IP;
use Socket qw(IPPROTO_UDP :addrinfo);
use Socket6 qw(inet_ntop);
use Getopt::Long;
use Pod::Usage;

Expand Down Expand Up @@ -33,7 +35,7 @@ our @hwaddr_regexs = (
'^[\da-f]{12}$',
);

my $DEFAULT_IP = '255.255.255.255';
my $DEFAULT_TARGET = '255.255.255.255';
my $DEFAULT_PORT = getservbyname('discard', 'udp');

my $verbose = 1;
Expand All @@ -47,6 +49,7 @@ my %stats = (
valid => 0,
invalid => 0,
sent => 0,
failed => 0,
);

######################################################################
Expand All @@ -58,14 +61,12 @@ sub isValidPort {
}


sub isValidIPAddress {
my $ipaddress = shift;
my $t = 0;
sub isValidTarget {
my $target = shift;

$t += $_ for map { ($_ <= 255)?1:0 }
$ipaddress =~ m/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
# TODO: check if target is a valid domain, IPv4 address or IPv6 address

return ($t == 4) ? 1 : 0;
return 1;
}


Expand Down Expand Up @@ -93,14 +94,14 @@ sub loadFromCommandLine {
}

$stats{valid}++;
push @queue, [ $arg, $DEFAULT_IP, $DEFAULT_PORT ];
push @queue, [ $arg, $DEFAULT_TARGET, $DEFAULT_PORT ];
}
}


sub loadFromFile {
my $filename = shift;
my ($hwaddr, $ipaddr, $port);
my ($hwaddr, $target, $port);

open (my $FILE, '<', $filename) or die "open : $!";
while(<$FILE>) {
Expand All @@ -110,17 +111,17 @@ sub loadFromFile {
$stats{total}++;

chomp;
($hwaddr, $ipaddr, $port) = split;
($hwaddr, $target, $port) = split;

if (! isValidHardwareAddress($hwaddr) ) {
warn "Invalid hardware address: $hwaddr\n";
$stats{invalid}++;
next;
}

$ipaddr = $DEFAULT_IP unless defined($ipaddr);
if (! isValidIPAddress($ipaddr) ) {
warn "Invalid IP address: $ipaddr\n";
$target = $DEFAULT_TARGET unless defined($target);
if (! isValidTarget($target) ) {
warn "Invalid target: $target\n";
$stats{invalid}++;
next;
}
Expand All @@ -133,7 +134,7 @@ sub loadFromFile {
}

$stats{valid}++;
push @queue, [ $hwaddr, $ipaddr, $port ];
push @queue, [ $hwaddr, $target, $port ];
}
close $FILE;
}
Expand All @@ -151,7 +152,7 @@ sub loadFromFile {
#

sub wake {
my ($sock, $hwaddr, $ipaddr, $port) = @_;
my ($hwaddr, $target, $port) = @_;
my ($raddr, $them, $pkt);
#
# Expects hardware address in canonical form (xx:xx:xx:xx:xx:xx)
Expand All @@ -169,18 +170,50 @@ sub wake {
# Send packet
#

# Patch by Eugenio Jarosiewicz <ej0 at mac.com>
# $raddr = inet_aton($ipaddr);
#
$raddr = gethostbyname($ipaddr);
$them = pack_sockaddr_in($port, $raddr);
my ($err_gai, @res) = getaddrinfo($target, $port, { family => AF_UNSPEC, protocol => IPPROTO_UDP } );

if ($err_gai) {
warn "getaddrinfo failed on $target with port $port: $err_gai";
return 0;
}

if (! @res) {
warn "failed to resolve $target with port $port";
return 0;
}

my ($addr, $sock);

foreach my $ai (@res) {
my $candidate = IO::Socket->new();

$candidate->socket($ai->{family}, $ai->{socktype}, $ai->{protocol}) or next;

$sock = $candidate;
$addr = $ai->{addr};
last;
}

if (! $sock) {
warn "failed to create socket for $target with port $port";
return 0;
}

print "Sending magic packet to $ipaddr:$port with payload $hwaddr\n"
setsockopt($sock, SOL_SOCKET, SO_BROADCAST, 1) or die "setsockopt : $!";

my ($gni_err, $ipaddr) = getnameinfo($addr, NI_NUMERICHOST, NIx_NOSERV);

if ($gni_err) {
$ipaddr = $target;
}

print "Sending magic packet to $ipaddr on port $port with payload $hwaddr\n"
if $verbose;

#send($sock, $pkt, 0, $them) or die "send : $!";
send($sock, $pkt, 0, $them) unless $dryrun;
$sock->send($pkt, 0, $addr) unless $dryrun;
$sock->shutdown(SHUT_RDWR);

return 1;
}


Expand All @@ -191,20 +224,14 @@ sub sendMagicPackets {
return;
}

my $sock;
my $proto = getprotobyname('udp');

socket($sock, AF_INET, SOCK_DGRAM, $proto) or die "socket : $!";
setsockopt($sock, SOL_SOCKET, SO_BROADCAST, 1) or die "setsockopt : $!";

for my $ref (@queue) {
if (wake($ref->[0], $ref->[1], $ref->[2])) {
$stats{sent}++;
next;
}

wake($sock, $ref->[0], $ref->[1], $ref->[2]);

$stats{sent}++;
$stats{failed}++;
}

close $sock;
}

######################################################################
Expand All @@ -219,7 +246,7 @@ GetOptions(
"h|help" => sub { pod2usage( -exitval => 0, -verbose => 1); },
"v|version" => sub { print "wakeonlan $VERSION\n"; exit(0); },
"q|quiet" => sub { $verbose = 0; },
"i|ip=s" => \$DEFAULT_IP,
"i|ip=s" => \$DEFAULT_TARGET,
"p|port=i" => \$DEFAULT_PORT,
"f|file=s" => \$filename,
"n|dry-run" => sub { $dryrun = 1; },
Expand All @@ -235,8 +262,8 @@ if (! isValidPort($DEFAULT_PORT)) {
exit(2);
}

if (! isValidIPAddress($DEFAULT_IP)) {
warn "Invalid default IP address: $DEFAULT_IP\n";
if (! isValidTarget($DEFAULT_TARGET)) {
warn "Invalid default target: $DEFAULT_TARGET\n";
exit(3);
}

Expand Down Expand Up @@ -268,7 +295,7 @@ sendMagicPackets();
if ($verbose) {
printf "Hardware addresses: <total=%d, valid=%d, invalid=%d>\n",
$stats{total}, $stats{valid}, $stats{invalid};
printf "Magic packets: <sent=%d>\n", $stats{sent};
printf "Magic packets: <sent=%d, failed=%d>\n", $stats{sent}, $stats{failed};
}

exit 0;
Expand Down