/[pxelator]/bin/dhcpd.pl
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Contents of /bin/dhcpd.pl

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Revision 17 - (show annotations)
Tue Jul 28 10:29:33 2009 UTC (11 years, 2 months ago) by dpavlin
File MIME type: text/plain
File size: 2872 byte(s)
read data from filesystem files and symlinks in conf/

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 File::Slurp;
12 use Data::Dump qw/dump/;
13
14 die "need to run $0 as root like this\nsudo $0\n" unless $< == 0;
15
16 my $debug = shift @ARGV;
17
18 our ( $file, $next_file );
19 our ( $ip_from, $ip_to ) = ( 10, 100 );
20
21 our $server_ip = readlink 'conf/server.ip';
22
23 my $sock = IO::Socket::INET->new(
24 LocalPort => 67,
25 # LocalAddr => 'localhost',
26 # LocalAddr => '10.0.0.100',
27 LocalAddr => '0.0.0.0',
28 Proto => 'udp',
29 ReuseAddr => 1,
30 # PeerPort => getservbyname('bootpc', 'udp'),
31 Broadcast => 1,
32 Type => SOCK_DGRAM,
33 ) or die "Failed to bind to socket: $@";
34
35
36 my $addr = $ip_from;
37
38 sub client_ip {
39 my ( $mac ) = @_;
40
41 my $conf = "conf/$server_ip";
42 mkdir $conf unless -e $conf;
43
44 if ( -e "$conf/$mac" ) {
45 my $ip = read_file "conf/mac/$mac";
46 print "$mac old $ip\n";
47 return $ip;
48 }
49
50 mkdir $_ foreach grep { ! -e $_ } map { "$conf/$_" } ( 'ip', 'mac' );
51
52 my $prefix = $server_ip;
53 $prefix =~ s{\.\d+$}{.};
54 my $ip = $prefix . $addr;
55 while ( -e "conf/ip/$ip" ) {
56 $ip = $prefix . $addr++;
57 die "all addresses allocated!" if $addr == $ip_to;
58 }
59
60 write_file "$conf/mac/$mac", $ip;
61 symlink "$conf/mac/$mac", "conf/ip/$ip";
62
63 print "$mac NEW $ip\n";
64
65 return $ip;
66 }
67
68 while (1) {
69
70 require "config.pl"; # refresh config
71
72 print "waiting for DHCP requests on ",$sock->sockhost,":",$sock->sockport,"\n";
73
74 my $buf;
75 $sock->recv($buf, 1024);
76 print "<< ",$sock->peerhost,":",$sock->peerport,"\n";
77
78 if (defined $buf) {
79
80 my $dhcp;
81
82 eval { $dhcp = Net::DHCP::Packet->new($buf); };
83 die "can't use request", dump( $buf ) if $@;
84
85 if ( $debug ) {
86 warn "recv: ", $dhcp->toString, "\n\n";
87 }
88
89 my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2);
90 my $ip = client_ip($mac);
91
92 if ( ! $file ) {
93 if ( $dhcp->getOptionValue(DHO_USER_CLASS()) ne 'gPXE' ) {
94 $file = 'undionly.kpxe';
95 } else {
96 $file = $next_file;
97 }
98 }
99
100 my $packet = new Net::DHCP::Packet(
101 Op => BOOTREPLY(),
102 Hops => $dhcp->hops(),
103 Xid => $dhcp->xid(),
104 Flags => $dhcp->flags(),
105 Ciaddr => $dhcp->ciaddr(),
106 Yiaddr => $ip,
107 Siaddr => $server_ip,
108 Giaddr => $dhcp->giaddr(),
109 Chaddr => $dhcp->chaddr(),
110 File => $file,
111 # DHO_DHCP_MESSAGE_TYPE() => DHCPACK(),
112 DHO_SUBNET_MASK() => '255.0.0.0',
113 );
114
115 warn ">> $mac == $ip server $server_ip\n";
116
117 warn "## ",$packet->toString(),"\n" if $debug;
118
119 my $reply = IO::Socket::INET->new(
120 LocalAddr => $server_ip,
121 LocalPort => 67,
122 Proto => "udp",
123 Broadcast => 1,
124 PeerAddr => '255.255.255.255',
125 PeerPort => 68,
126 Reuse => 1,
127 ) or die "socket: $@";
128
129 my $buff = $packet->serialize();
130 $reply->send( $buff, 0 ) or die "Error sending: $!\n";
131
132 # system("arp -s $ip $mac"),
133
134 } else {
135 print "No bootp request.\n";
136 }
137
138 }

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