check if IP is available using Net::Ping

diff --git a/bin/dhcpd.pl b/bin/dhcpd.pl
index 2f62670..059f9f7 100755 (executable)
--- 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;
        }