7 perl -Ilib/PXElator -Ilib -Mdhcpd -e start
9 based on L<http://www.perlmonks.org/index.pl?node_id=325248>
20 use Data::Dump qw/dump/;
25 use Net::DHCP::Packet;
26 use Net::DHCP::Constants 0.67;
29 my $debug = server::debug;
32 if ( ! $server::ip ) {
33 my $server_ip = `/sbin/ifconfig`;
34 $server_ip =~ s/^.+?addr:([\d\.]+).*$/$1/gs;
35 $server::ip = $server_ip;
38 warn "server ip $server::ip file: $pxe::file range: $server::ip_from - $server::ip_to\n";
40 my $addr = $server::ip_from;
45 my $conf = "$server::base_dir/conf/$server::ip";
46 mkdir $conf unless -e $conf;
48 if ( -e "$conf/mac/$mac" ) {
49 my $ip = read_file "$conf/mac/$mac";
50 print "$mac old $ip\n";
54 mkdir $_ foreach grep { ! -e $_ } map { "$conf/$_" } ( 'ip', 'mac' );
56 my $p = Net::Ping->new;
58 my $prefix = $server::ip;
59 $prefix =~ s{\.\d+$}{.};
60 my $ip = $prefix . $addr;
61 while ( -e "conf/ip/$ip" || $p->ping( $ip ) ) {
62 $ip = $prefix . $addr++;
63 die "all addresses allocated!" if $addr == $server::ip_to;
66 write_file "$conf/mac/$mac", $ip;
67 if ( -l "$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 $ip";
73 print "$mac NEW $ip\n";
78 our $transaction = 0; # FIXME predictible transaction numbers
84 $sock->recv($buf, 1024);
86 $size = length($buf) . ' bytes' if defined $buf;
88 print "packet from ",$sock->peerhost,":",$sock->peerport," $size\n";
91 my $dhcp = Net::DHCP::Packet->new($buf);
92 $dhcp->comment( $transaction++ );
94 warn "recv: ", $dhcp->toString if $debug;
96 my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2);
97 my $ip = client_ip($mac);
101 my $user_class = $dhcp->getOptionValue(DHO_USER_CLASS());
103 if ( $user_class eq 'gPXE' ) {
105 } elsif ( ! $file ) {
106 $file = 'undionly.kpxe';
113 Hops => $dhcp->hops(),
115 Flags => $dhcp->flags(),
116 Ciaddr => $dhcp->ciaddr(),
118 Siaddr => $server::ip,
119 Giaddr => $dhcp->giaddr(),
120 Chaddr => $dhcp->chaddr(),
124 pxe::config_for_ip( $ip );
126 my $messagetype = $dhcp->getOptionValue(DHO_DHCP_MESSAGE_TYPE());
128 if ($messagetype eq DHCPDISCOVER()) {
129 warn "DHCP DISCOVER";
130 $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 warn "DHCP REQUEST $requested_ip";
135 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';
145 $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPNAK();
146 $packet->{DHO_DHCP_MESSAGE()} = "Bad request, expected $ip";
148 } elsif ($messagetype eq DHCPINFORM()) {
149 warn "DHCP INFORM ignored";
151 warn "$messagetype igored (bootp?)";
154 warn ">> $mac == $ip server: $server::ip", $pxe::file ? " pxe file: $pxe::file\n" : "\n";
156 $packet = new Net::DHCP::Packet( %$packet );
157 warn "send ",$packet->toString() if $debug;
159 my $reply = IO::Socket::INET->new(
160 LocalAddr => $server::ip,
164 PeerAddr => '255.255.255.255',
167 ) or die "socket: $@";
169 my $buff = $packet->serialize();
170 $reply->send( $buff, 0 ) or die "Error sending: $!\n";
172 # system("arp -s $ip $mac"),
178 my $sock = IO::Socket::INET->new(
180 # LocalAddr => 'localhost',
181 # LocalAddr => '10.0.0.100',
182 LocalAddr => '0.0.0.0',
185 # PeerPort => getservbyname('bootpc', 'udp'),
188 ) or die "Failed to bind to socket: $@";
190 print "DHCP listen on ",$sock->sockhost,":",$sock->sockport,"\n";
193 Module::Refresh->refresh;
194 process_packet $sock;