--- wakeonlan-0.41.orig/wakeonlan
+++ wakeonlan-0.41/wakeonlan
@@ -5,6 +5,7 @@
 #########################################################################       
 
 use strict;
+use Net::hostent;
 use Socket;
 use Getopt::Std;
 use vars qw($VERSION $opt_v $opt_h $opt_i $opt_p $opt_f);
@@ -44,19 +45,64 @@
 
 sub wake
 {
-	my $hwaddr  = shift;
+	my $host    = shift;
 	my $ipaddr  = shift || $DEFAULT_IP;
 	my $port    = shift || $DEFAULT_PORT;
 
 	my ($raddr, $them, $proto);
-	my ($hwaddr_re, $pkt);
+	my ($hwaddr, $hwaddr_re, $pkt);
 	
-	# Validate hardware address (ethernet address)
+	# get the hardware address (ethernet address)
 
 	$hwaddr_re = join(':', ('[0-9A-Fa-f]{1,2}') x 6);
-	if ($hwaddr !~ m/^$hwaddr_re$/) {
-		warn "Invalid hardware address: $hwaddr\n";
-		return undef;
+	if ($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/^$ip_re$/) {
+					if ($ip eq $ip_addr) {
+						$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
@@ -68,7 +114,7 @@
 
 	# Allocate socket and send packet
 
-	$raddr = gethostbyname($ipaddr);
+	$raddr = gethostbyname($ipaddr)->addr;
 	$them = pack_sockaddr_in($port, $raddr);
 	$proto = getprotobyname('udp');