/[pxelator]/lib/PXElator/dhcpd.pm
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Annotation of /lib/PXElator/dhcpd.pm

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Revision 44 - (hide annotations)
Wed Jul 29 20:55:44 2009 UTC (14 years, 8 months ago) by dpavlin
File size: 4514 byte(s)
cleanup dhcpd server

1 dpavlin 1 #!/usr/bin/perl
2    
3 dpavlin 44 =head1 dhcpd
4 dpavlin 1
5 dpavlin 44 start with:
6    
7     perl -Ilib/PXElator -Ilib -Mdhcpd -e start
8    
9     based on L<http://www.perlmonks.org/index.pl?node_id=325248>
10    
11     =cut
12    
13 dpavlin 1 use strict;
14     use warnings;
15    
16 dpavlin 22 use autodie;
17    
18 dpavlin 1 use IO::Socket::INET;
19 dpavlin 17 use File::Slurp;
20 dpavlin 1 use Data::Dump qw/dump/;
21 dpavlin 36 use Net::Ping;
22 dpavlin 44 use Module::Refresh;
23 dpavlin 1
24 dpavlin 44 use lib '..';
25 dpavlin 27 use Net::DHCP::Packet;
26     use Net::DHCP::Constants 0.67;
27 dpavlin 1
28 dpavlin 44 use server;
29 dpavlin 1
30 dpavlin 44 my $debug = 1;
31    
32 dpavlin 22 our ( $file, $gpxe_file );
33 dpavlin 17 our ( $ip_from, $ip_to ) = ( 10, 100 );
34 dpavlin 1
35 dpavlin 44 if ( ! $server::ip ) {
36     my $server_ip = `/sbin/ifconfig`;
37 dpavlin 22 $server_ip =~ s/^.+?addr:([\d\.]+).*$/$1/gs;
38 dpavlin 44 $server::ip = $server_ip;
39 dpavlin 22 }
40    
41 dpavlin 44 warn "server ip $server::ip\n";
42 dpavlin 1
43 dpavlin 17 my $addr = $ip_from;
44    
45 dpavlin 1 sub client_ip {
46     my ( $mac ) = @_;
47    
48 dpavlin 44 my $conf = "conf/$server::ip";
49 dpavlin 17 mkdir $conf unless -e $conf;
50 dpavlin 1
51 dpavlin 22 if ( -e "$conf/mac/$mac" ) {
52     my $ip = read_file "$conf/mac/$mac";
53 dpavlin 17 print "$mac old $ip\n";
54     return $ip;
55     }
56 dpavlin 1
57 dpavlin 17 mkdir $_ foreach grep { ! -e $_ } map { "$conf/$_" } ( 'ip', 'mac' );
58    
59 dpavlin 36 my $p = Net::Ping->new;
60    
61 dpavlin 44 my $prefix = $server::ip;
62 dpavlin 17 $prefix =~ s{\.\d+$}{.};
63     my $ip = $prefix . $addr;
64 dpavlin 36 while ( -e "conf/ip/$ip" || $p->ping( $ip ) ) {
65 dpavlin 17 $ip = $prefix . $addr++;
66     die "all addresses allocated!" if $addr == $ip_to;
67 dpavlin 1 }
68    
69 dpavlin 17 write_file "$conf/mac/$mac", $ip;
70 dpavlin 33 if ( -l "$conf/ip/$ip" && readlink "$conf/ip/$ip" ne "$conf/mac/$mac") {
71     unlink "$conf/ip/$ip";
72     symlink "$conf/mac/$mac", "$conf/ip/$ip";
73     warn "$mac IP changed to $ip";
74     }
75 dpavlin 17
76     print "$mac NEW $ip\n";
77    
78 dpavlin 1 return $ip;
79     }
80    
81 dpavlin 44 our $transaction = 0; # FIXME predictible transaction numbers
82 dpavlin 27
83 dpavlin 44 sub process_packet {
84     my $sock = shift;
85 dpavlin 1
86     my $buf;
87     $sock->recv($buf, 1024);
88 dpavlin 44 my $size = 'empty';
89     $size = length($buf) . ' bytes' if defined $buf;
90 dpavlin 1
91 dpavlin 44 print "packet from ",$sock->peerhost,":",$sock->peerport," $size\n";
92     return unless $buf;
93 dpavlin 1
94 dpavlin 44 my $dhcp = Net::DHCP::Packet->new($buf);
95     $dhcp->comment( $transaction++ );
96 dpavlin 1
97 dpavlin 44 warn "recv: ", $dhcp->toString;
98 dpavlin 1
99 dpavlin 44 my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2);
100     my $ip = client_ip($mac);
101 dpavlin 1
102 dpavlin 44 =for later
103 dpavlin 6
104 dpavlin 44 my $user_class = $dhcp->getOptionValue(DHO_USER_CLASS());
105 dpavlin 1
106 dpavlin 44 if ( $user_class eq 'gPXE' ) {
107     $file = $gpxe_file;
108     } elsif ( ! $file ) {
109     $file = 'undionly.kpxe';
110     }
111 dpavlin 22
112 dpavlin 44 =cut
113    
114     my $packet = {
115     Op => BOOTREPLY(),
116     Hops => $dhcp->hops(),
117     Xid => $dhcp->xid(),
118     Flags => $dhcp->flags(),
119     Ciaddr => $dhcp->ciaddr(),
120     Yiaddr => $ip,
121     Siaddr => $server::ip,
122     Giaddr => $dhcp->giaddr(),
123     Chaddr => $dhcp->chaddr(),
124     File => $file,
125     };
126    
127     my $messagetype = $dhcp->getOptionValue(DHO_DHCP_MESSAGE_TYPE());
128    
129     if ($messagetype eq DHCPDISCOVER()) {
130     warn "DHCP DISCOVER";
131     $packet->{Comment} = $dhcp->comment();
132     $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPOFFER();
133     } elsif ($messagetype eq DHCPREQUEST()) {
134     my $requested_ip = $dhcp->getOptionValue(DHO_DHCP_REQUESTED_ADDRESS());
135     warn "DHCP REQUEST $requested_ip";
136     if ( $ip eq $requested_ip ) {
137     $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPACK();
138     $packet->{DHO_DHCP_LEASE_TIME()} = 5 * 60; # 5 min
139     # $packet->{DHO_DHCP_SERVER_IDENTIFIER()} = $server::ip; # FIXME
140     $packet->{DHO_SUBNET_MASK()} = '255.255.255.0';
141     $packet->{DHO_ROUTERS()} = $server::ip;
142     # $packet->{DHO_DOMAIN_NAME()} = 'pxelator.lan';
143     # $packet->{DHO_NAME_SERVERS()} = $server::ip;
144     # $packet->{DHO_ROOT_PATH()} = '/exports/foobar';
145 dpavlin 27 } else {
146 dpavlin 44 $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPNAK();
147     $packet->{DHO_DHCP_MESSAGE()} = "Bad request, expected $ip";
148 dpavlin 27 }
149 dpavlin 44 } elsif ($messagetype eq DHCPINFORM()) {
150     warn "DHCP INFORM ignored";
151     } else {
152     warn "$messagetype igored (bootp?)";
153     }
154 dpavlin 27
155 dpavlin 44 warn ">> $mac == $ip server: $server::ip", $file ? " file: $file\n" : "\n";
156 dpavlin 27
157 dpavlin 44 $packet = new Net::DHCP::Packet( %$packet );
158     warn "## ",$packet->toString(),"\n" if $debug;
159 dpavlin 27
160 dpavlin 44 my $reply = IO::Socket::INET->new(
161     LocalAddr => $server::ip,
162     LocalPort => 67,
163     Proto => "udp",
164     Broadcast => 1,
165     PeerAddr => '255.255.255.255',
166     PeerPort => 68,
167     Reuse => 1,
168     ) or die "socket: $@";
169 dpavlin 1
170 dpavlin 44 my $buff = $packet->serialize();
171     $reply->send( $buff, 0 ) or die "Error sending: $!\n";
172 dpavlin 1
173 dpavlin 44 # system("arp -s $ip $mac"),
174 dpavlin 1
175 dpavlin 44 }
176 dpavlin 1
177 dpavlin 44 sub start {
178    
179     my $sock = IO::Socket::INET->new(
180     LocalPort => 67,
181     # LocalAddr => 'localhost',
182     # LocalAddr => '10.0.0.100',
183     LocalAddr => '0.0.0.0',
184     Proto => 'udp',
185     ReuseAddr => 1,
186     # PeerPort => getservbyname('bootpc', 'udp'),
187     Broadcast => 1,
188     Type => SOCK_DGRAM,
189     ) or die "Failed to bind to socket: $@";
190    
191     print "DHCP listen on ",$sock->sockhost,":",$sock->sockport,"\n";
192    
193     while (1) {
194     Module::Refresh->refresh;
195     process_packet $sock;
196 dpavlin 1 }
197 dpavlin 44 }
198 dpavlin 1
199 dpavlin 44 1;

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