3 # based on http://www.perlmonks.org/index.pl?node_id=325248
11 use Net::DHCP::Packet;
12 use Net::DHCP::Constants;
14 use Data::Dump qw/dump/;
16 die "need to run $0 as root like this\nsudo $0\n" unless $< == 0;
18 my $debug = shift @ARGV;
20 our ( $file, $gpxe_file );
21 our ( $ip_from, $ip_to ) = ( 10, 100 );
23 our $server_ip = readlink 'conf/server.ip' if -l 'conf/server.ip';
26 $server_ip = `/sbin/ifconfig`;
27 $server_ip =~ s/^.+?addr:([\d\.]+).*$/$1/gs;
28 warn "auto-configure server ip to $server_ip\n";
30 warn "server ip $server_ip\n";
33 my $sock = IO::Socket::INET->new(
35 # LocalAddr => 'localhost',
36 # LocalAddr => '10.0.0.100',
37 LocalAddr => '0.0.0.0',
40 # PeerPort => getservbyname('bootpc', 'udp'),
43 ) or die "Failed to bind to socket: $@";
51 my $conf = "conf/$server_ip";
52 mkdir $conf unless -e $conf;
54 if ( -e "$conf/mac/$mac" ) {
55 my $ip = read_file "$conf/mac/$mac";
56 print "$mac old $ip\n";
60 mkdir $_ foreach grep { ! -e $_ } map { "$conf/$_" } ( 'ip', 'mac' );
62 my $prefix = $server_ip;
63 $prefix =~ s{\.\d+$}{.};
64 my $ip = $prefix . $addr;
65 while ( -e "conf/ip/$ip" ) {
66 $ip = $prefix . $addr++;
67 die "all addresses allocated!" if $addr == $ip_to;
70 write_file "$conf/mac/$mac", $ip;
71 unlink "$conf/ip/$ip" if -e "$conf/ip/$ip";
72 symlink "$conf/mac/$mac", "$conf/ip/$ip";
74 print "$mac NEW $ip\n";
81 require "config.pl"; # refresh config
83 print "waiting for DHCP requests on ",$sock->sockhost,":",$sock->sockport,"\n";
86 $sock->recv($buf, 1024);
87 print "<< ",$sock->peerhost,":",$sock->peerport,"\n";
93 eval { $dhcp = Net::DHCP::Packet->new($buf); };
94 die "can't use request", dump( $buf ) if $@;
97 warn "recv: ", $dhcp->toString, "\n\n";
100 my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2);
101 my $ip = client_ip($mac);
102 my $user_class = $dhcp->getOptionValue(DHO_USER_CLASS());
104 if ( $user_class eq 'gPXE' ) {
106 } elsif ( ! $file ) {
107 $file = 'undionly.kpxe';
110 my $packet = new Net::DHCP::Packet(
112 Hops => $dhcp->hops(),
114 Flags => $dhcp->flags(),
115 Ciaddr => $dhcp->ciaddr(),
117 Siaddr => $server_ip,
118 Giaddr => $dhcp->giaddr(),
119 Chaddr => $dhcp->chaddr(),
121 # DHO_DHCP_MESSAGE_TYPE() => DHCPACK(),
122 DHO_SUBNET_MASK() => '255.0.0.0',
125 warn ">> $mac == $ip server: $server_ip file: $file\n";
127 warn "## ",$packet->toString(),"\n" if $debug;
129 my $reply = IO::Socket::INET->new(
130 LocalAddr => $server_ip,
134 PeerAddr => '255.255.255.255',
137 ) or die "socket: $@";
139 my $buff = $packet->serialize();
140 $reply->send( $buff, 0 ) or die "Error sending: $!\n";
142 # system("arp -s $ip $mac"),
145 print "No bootp request.\n";