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/;
23 use Net::DHCP::Packet;
24 use Net::DHCP::Constants 0.67;
30 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 range: $server::ip_from - $server::ip_to\n";
43 my ( $mac, $request_ip ) = @_;
45 my $conf = $server::conf;
46 mkdir $conf unless -e $conf;
50 if ( $ip = client::ip_from_mac( $mac ) ) {
51 print "RENEW $mac $ip\n";
53 } elsif ( in_our_range( $request_ip ) ) {
54 $ip = client::next_ip( $mac );
55 print "NEW $mac $ip\n";
58 client::save_ip_mac( $ip, $mac );
59 warn "W: $ip our of server range $server::ip $server::netmask\n";
71 our $transaction = 0; # FIXME predictible transaction numbers
73 sub ip2bin { pack('C*', split(/\./, $_[0])) };
76 return 1 if $ip eq '0.0.0.0';
78 ( ip2bin($ip) & ip2bin($server::netmask) )
80 ( ip2bin($server::ip) & ip2bin($server::netmask) )
90 $sock->recv($buf, 1024);
92 $size = length($buf) . ' bytes' if defined $buf;
94 print "packet from ",$sock->peerhost,":",$sock->peerport," $size\n" if $debug;
97 my $dhcp = Net::DHCP::Packet->new($buf);
98 $dhcp->comment( $transaction++ );
100 warn "recv: ", $dhcp->toString if $debug;
102 my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2);
103 my $ip = client_mac_ip($mac, $dhcp->ciaddr);
105 my $hostname = $dhcp->getOptionValue(DHO_HOST_NAME);
106 print "$ip ", client::conf( $ip => 'hostname', default => $hostname ), " >> /etc/hosts\n";
108 my $audit = { mac => format::mac($mac), ip => $ip, hostname => $hostname };
112 my $user_class = $dhcp->getOptionValue(DHO_USER_CLASS());
114 if ( $user_class eq 'gPXE' ) {
116 } elsif ( ! $file ) {
117 $file = 'undionly.kpxe';
122 config::for_ip( $ip );
126 Hops => $dhcp->hops(),
128 Flags => $dhcp->flags(),
129 Ciaddr => $dhcp->ciaddr(),
131 Siaddr => $server::ip,
132 Giaddr => $dhcp->giaddr(),
133 Chaddr => $dhcp->chaddr(),
135 DHO_DHCP_SERVER_IDENTIFIER() => $server::ip, # busybox/udhcpc needs it but doesn't request
139 DHO_SUBNET_MASK() => $server::netmask,
140 DHO_ROUTERS() => $server::ip,
141 DHO_DOMAIN_NAME() => $server::domain_name,
142 DHO_NAME_SERVERS() => $server::ip,
143 DHO_DOMAIN_NAME_SERVERS() => $server::ip,
144 DHO_HOST_NAME() => client::conf( $ip, 'hostname' ),
145 DHO_BROADCAST_ADDRESS() => $server::bcast,
146 # DHO_NTP_SERVERS() => '',
149 my @requested = split(/\s/, $dhcp->getOptionValue(DHO_DHCP_PARAMETER_REQUEST_LIST));
150 warn "options ",dump( $options ), ' requested: ',dump( @requested ) if $debug;
153 foreach ( @requested ) {
154 if ( defined $options->{$_} ) {
155 $packet->{$_} = $options->{$_};
161 warn "W: options requested but missing: ",dump( @missing ),$/;
162 $audit->{requested} = [ @requested ];
163 $audit->{missing} = [ @missing ];
165 foreach my $opt ( 'magic', 'config_file', 'path_prefix', 'reboot_time' ) {
166 my $DH0 = eval 'DHO_PXELINUX_' . uc $opt;
167 warn "DH0: $@" if $@;
168 my $v = eval "\$pxelinux::$opt";
170 next unless defined $v;
171 warn "pxelinux dhcp option $opt = $DH0 = $v\n" if $debug;
172 $packet->{ $DH0 } = $v;
175 my $messagetype = $dhcp->getOptionValue(DHO_DHCP_MESSAGE_TYPE());
177 if ($messagetype eq DHCPDISCOVER()) {
178 $audit->{type} = 'discover';
179 $packet->{Comment} = $dhcp->comment();
180 $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPOFFER();
181 } elsif ($messagetype eq DHCPREQUEST()) {
182 my $requested_ip = $dhcp->getOptionValue(DHO_DHCP_REQUESTED_ADDRESS());
183 $audit->{type} = 'request';
184 if ( $ip eq $requested_ip ) {
185 $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPACK();
186 $packet->{DHO_DHCP_LEASE_TIME()} = 5 * 60; # 5 min
187 # $packet->{DHO_ROOT_PATH()} = '/exports/foobar';
189 $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPNAK();
190 $packet->{DHO_DHCP_MESSAGE()} = "Bad request, expected $ip";
192 } elsif ($messagetype eq DHCPINFORM()) {
193 $audit->{type} = 'inform';
195 $audit->{type} = sprintf('ignored %x', $messagetype);
198 warn ">> $mac == $ip server: $server::ip", $file ? " file: $file\n" : "\n" if $debug;
199 $audit->{response} = $packet;
201 $packet = new Net::DHCP::Packet( %$packet );
202 warn "send ",$packet->toString() if $debug;
204 if ( in_our_range( $ip ) ) {
205 my $buff = $packet->serialize();
207 my $reply = IO::Socket::INET->new(
208 LocalAddr => $server::ip,
212 PeerAddr => '255.255.255.255',
215 ) or die "socket: $@";
217 $reply->send( $buff, 0 ) or die "Error sending: $!\n";
219 $audit->{error} = "$ip our of our range $server::ip $server::netmask";
222 CouchDB::audit( $audit->{type}, $audit );
224 # system("arp -s $ip $mac"),
230 my $sock = IO::Socket::INET->new(
232 # LocalAddr => 'localhost',
233 # LocalAddr => '10.0.0.100',
234 LocalAddr => '0.0.0.0',
237 # PeerPort => getservbyname('bootpc', 'udp'),
240 ) or die "Failed to bind to socket: $@";
242 print "DHCP listen on ",$sock->sockhost,":",$sock->sockport,"\n";
244 CouchDB::audit( 'start', { addr => $sock->sockhost, port => $sock->sockport } );
247 process_packet $sock;