/[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 1 - (show annotations)
Sun Jul 26 00:38:57 2009 UTC (12 years, 10 months ago) by dpavlin
File MIME type: text/plain
File size: 2231 byte(s)
first cut at dhcp and tftp servers in perl (gPXE boot works)

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 my $ip_server = '10.0.0.100';
18
19 my $sock = IO::Socket::INET->new(
20 LocalPort => 67,
21 # LocalAddr => 'localhost',
22 # LocalAddr => '10.0.0.100',
23 LocalAddr => '0.0.0.0',
24 Proto => 'udp',
25 ReuseAddr => 1,
26 # PeerPort => getservbyname('bootpc', 'udp'),
27 Broadcast => 1,
28 Type => SOCK_DGRAM,
29 ) or die "Failed to bind to socket: $@";
30
31 my $_ip = 10;
32 my $_mac2ip;
33
34 sub client_ip {
35 my ( $mac ) = @_;
36
37 my $ip = $_mac2ip->{$mac};
38 return $ip if $ip;
39
40 $ip = "10.0.0.$_ip";
41 $_mac2ip->{$mac} = $ip;
42
43 $_ip++;
44 if ( $_ip == 100 ) {
45 warn "IP roll-over to 10\n";
46 $_ip = 10;
47 }
48
49 return $ip;
50 }
51
52 while (1) {
53
54 print "waiting for DHCP requests on ",$sock->sockhost,":",$sock->sockport,"\n";
55
56 my $buf;
57 $sock->recv($buf, 1024);
58 print "<< peer:",$sock->peerhost,":",$sock->peerport,"\n";
59
60 if (defined $buf) {
61
62 my $dhcp;
63
64 eval { $dhcp = Net::DHCP::Packet->new($buf); };
65 die "can't use request", dump( $buf ) if $@;
66
67 if ( $debug ) {
68 warn "recv: ", $dhcp->toString, "\n\n";
69 }
70
71 my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2);
72 my $ip = client_ip($mac);
73
74 my $packet = new Net::DHCP::Packet(
75 Op => BOOTREPLY(),
76 Hops => $dhcp->hops(),
77 Xid => $dhcp->xid(),
78 Flags => $dhcp->flags(),
79 Ciaddr => $dhcp->ciaddr(),
80 Yiaddr => $ip,
81 Siaddr => $ip_server,
82 Giaddr => $dhcp->giaddr(),
83 Chaddr => $dhcp->chaddr(),
84 File => 'undionly.kpxe',
85 # DHO_DHCP_MESSAGE_TYPE() => DHCPACK(),
86 DHO_SUBNET_MASK() => '255.0.0.0',
87 );
88
89 warn ">> $mac == $ip server $ip_server\n";
90
91 warn "## ",$packet->toString(),"\n" if $debug;
92
93 my $reply = IO::Socket::INET->new(
94 LocalAddr => $ip_server,
95 LocalPort => 67,
96 Proto => "udp",
97 Broadcast => 1,
98 PeerAddr => '255.255.255.255',
99 PeerPort => 68,
100 Reuse => 1,
101 ) or die "socket: $@";
102
103 my $buff = $packet->serialize();
104 $reply->send( $buff, 0 ) or die "Error sending: $!\n";
105
106 # system("arp -s $ip $mac"),
107
108 } else {
109 print "No bootp request.\n";
110 }
111
112 }

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