/[pxelator]/bin/dhcpd.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /bin/dhcpd.pl

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Revision 6 - (show annotations)
Sun Jul 26 15:16:52 2009 UTC (12 years, 9 months ago) by dpavlin
File MIME type: text/plain
File size: 2362 byte(s)
don't deliver gPXE to systems which allready have that user class option
in DHCP request (to prevent loops)

1 #!/usr/bin/perl
2
3 # based on http://www.perlmonks.org/index.pl?node_id=325248
4
5 use strict;
6 use warnings;
7
8 use IO::Socket::INET;
9 use Net::DHCP::Packet;
10 use Net::DHCP::Constants;
11 use Data::Dump qw/dump/;
12
13 die "need to run $0 as root like this\nsudo $0\n" unless $< == 0;
14
15 my $debug = shift @ARGV;
16
17 our ( $server_ip, $next_file );
18 require "config.pl";
19
20 my $sock = IO::Socket::INET->new(
21 LocalPort => 67,
22 # LocalAddr => 'localhost',
23 # LocalAddr => '10.0.0.100',
24 LocalAddr => '0.0.0.0',
25 Proto => 'udp',
26 ReuseAddr => 1,
27 # PeerPort => getservbyname('bootpc', 'udp'),
28 Broadcast => 1,
29 Type => SOCK_DGRAM,
30 ) or die "Failed to bind to socket: $@";
31
32 my $_ip = 10;
33 my $_mac2ip;
34
35 sub client_ip {
36 my ( $mac ) = @_;
37
38 my $ip = $_mac2ip->{$mac};
39 return $ip if $ip;
40
41 $ip = "10.0.0.$_ip";
42 $_mac2ip->{$mac} = $ip;
43
44 $_ip++;
45 if ( $_ip == 100 ) {
46 warn "IP roll-over to 10\n";
47 $_ip = 10;
48 }
49
50 return $ip;
51 }
52
53 while (1) {
54
55 print "waiting for DHCP requests on ",$sock->sockhost,":",$sock->sockport,"\n";
56
57 my $buf;
58 $sock->recv($buf, 1024);
59 print "<< peer:",$sock->peerhost,":",$sock->peerport,"\n";
60
61 if (defined $buf) {
62
63 my $dhcp;
64
65 eval { $dhcp = Net::DHCP::Packet->new($buf); };
66 die "can't use request", dump( $buf ) if $@;
67
68 if ( $debug ) {
69 warn "recv: ", $dhcp->toString, "\n\n";
70 }
71
72 my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2);
73 my $ip = client_ip($mac);
74
75 my $file = $next_file;
76 $file = 'undionly.kpxe' if ! $file || $dhcp->getOptionValue(DHO_USER_CLASS()) ne 'gPXE';
77
78 my $packet = new Net::DHCP::Packet(
79 Op => BOOTREPLY(),
80 Hops => $dhcp->hops(),
81 Xid => $dhcp->xid(),
82 Flags => $dhcp->flags(),
83 Ciaddr => $dhcp->ciaddr(),
84 Yiaddr => $ip,
85 Siaddr => $server_ip,
86 Giaddr => $dhcp->giaddr(),
87 Chaddr => $dhcp->chaddr(),
88 File => $file,
89 # DHO_DHCP_MESSAGE_TYPE() => DHCPACK(),
90 DHO_SUBNET_MASK() => '255.0.0.0',
91 );
92
93 warn ">> $mac == $ip server $server_ip\n";
94
95 warn "## ",$packet->toString(),"\n" if $debug;
96
97 my $reply = IO::Socket::INET->new(
98 LocalAddr => $server_ip,
99 LocalPort => 67,
100 Proto => "udp",
101 Broadcast => 1,
102 PeerAddr => '255.255.255.255',
103 PeerPort => 68,
104 Reuse => 1,
105 ) or die "socket: $@";
106
107 my $buff = $packet->serialize();
108 $reply->send( $buff, 0 ) or die "Error sending: $!\n";
109
110 # system("arp -s $ip $mac"),
111
112 } else {
113 print "No bootp request.\n";
114 }
115
116 }

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