From 1f346fd6b56669c3fe3be383f5e543cc514cc5db Mon Sep 17 00:00:00 2001
From: Dobrica Pavlinusic <dpavlin@rot13.org>
Date: Wed, 29 Jul 2009 13:03:39 +0000
Subject: [PATCH] check if IP is available using Net::Ping

---
 bin/dhcpd.pl | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/bin/dhcpd.pl b/bin/dhcpd.pl
index 2f62670..059f9f7 100755
--- a/bin/dhcpd.pl
+++ b/bin/dhcpd.pl
@@ -10,6 +10,7 @@ use autodie;
 use IO::Socket::INET;
 use File::Slurp;
 use Data::Dump qw/dump/;
+use Net::Ping;
 
 use lib 'lib';
 use Net::DHCP::Packet;
@@ -60,10 +61,12 @@ sub client_ip {
 
 	mkdir $_ foreach grep { ! -e $_ } map { "$conf/$_" } ( 'ip', 'mac' );
 
+	my $p = Net::Ping->new;
+
 	my $prefix = $server_ip;
 	$prefix =~ s{\.\d+$}{.};
 	my $ip = $prefix . $addr;
-	while ( -e "conf/ip/$ip" ) {
+	while ( -e "conf/ip/$ip" || $p->ping( $ip ) ) {
 		$ip = $prefix . $addr++;
 		die "all addresses allocated!" if $addr == $ip_to;
 	}
-- 
2.20.1