/[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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Annotation of /bin/dhcpd.pl

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Revision 12 - (hide annotations)
Mon Jul 27 22:18:51 2009 UTC (13 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 2449 byte(s)
make first pxe payload configurable
(and use gPXE if there is no setup for $file)
beginning of symlink farm type configuration

1 dpavlin 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 dpavlin 12 our ( $server_ip, $file, $next_file );
18 dpavlin 1
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 dpavlin 8 $ip = $server_ip;
41     $ip =~ s{\.\d+$}{.$_ip};
42 dpavlin 1 $_mac2ip->{$mac} = $ip;
43    
44     $_ip++;
45     if ( $_ip == 100 ) {
46     warn "IP roll-over to 10\n";
47     $_ip = 10;
48     }
49    
50     return $ip;
51     }
52    
53     while (1) {
54    
55 dpavlin 12 require "config.pl"; # refresh config
56    
57 dpavlin 1 print "waiting for DHCP requests on ",$sock->sockhost,":",$sock->sockport,"\n";
58    
59     my $buf;
60     $sock->recv($buf, 1024);
61     print "<< peer:",$sock->peerhost,":",$sock->peerport,"\n";
62    
63     if (defined $buf) {
64    
65     my $dhcp;
66    
67     eval { $dhcp = Net::DHCP::Packet->new($buf); };
68     die "can't use request", dump( $buf ) if $@;
69    
70     if ( $debug ) {
71     warn "recv: ", $dhcp->toString, "\n\n";
72     }
73    
74     my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2);
75     my $ip = client_ip($mac);
76    
77 dpavlin 12 if ( ! $file ) {
78     if ( $dhcp->getOptionValue(DHO_USER_CLASS()) ne 'gPXE' ) {
79     $file = 'undionly.kpxe';
80     } else {
81     $file = $next_file;
82     }
83     }
84 dpavlin 6
85 dpavlin 1 my $packet = new Net::DHCP::Packet(
86     Op => BOOTREPLY(),
87     Hops => $dhcp->hops(),
88     Xid => $dhcp->xid(),
89     Flags => $dhcp->flags(),
90     Ciaddr => $dhcp->ciaddr(),
91     Yiaddr => $ip,
92 dpavlin 3 Siaddr => $server_ip,
93 dpavlin 1 Giaddr => $dhcp->giaddr(),
94     Chaddr => $dhcp->chaddr(),
95 dpavlin 6 File => $file,
96 dpavlin 1 # DHO_DHCP_MESSAGE_TYPE() => DHCPACK(),
97     DHO_SUBNET_MASK() => '255.0.0.0',
98     );
99    
100 dpavlin 3 warn ">> $mac == $ip server $server_ip\n";
101 dpavlin 1
102     warn "## ",$packet->toString(),"\n" if $debug;
103    
104     my $reply = IO::Socket::INET->new(
105 dpavlin 3 LocalAddr => $server_ip,
106 dpavlin 1 LocalPort => 67,
107     Proto => "udp",
108     Broadcast => 1,
109     PeerAddr => '255.255.255.255',
110     PeerPort => 68,
111     Reuse => 1,
112     ) or die "socket: $@";
113    
114     my $buff = $packet->serialize();
115     $reply->send( $buff, 0 ) or die "Error sending: $!\n";
116    
117     # system("arp -s $ip $mac"),
118    
119     } else {
120     print "No bootp request.\n";
121     }
122    
123     }

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