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

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Revision 72 - (hide annotations)
Thu Jul 30 23:57:19 2009 UTC (14 years, 8 months ago) by dpavlin
File size: 4668 byte(s)
record and display log changes by mac addresses

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

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