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/;
24 use Net::DHCP::Packet;
25 use Net::DHCP::Constants 0.67;
28 my $debug = server::debug;
30 if ( ! $server::ip ) {
31 my $server_ip = `/sbin/ifconfig`;
32 $server_ip =~ s/^.+?addr:([\d\.]+).*$/$1/gs;
33 $server::ip = $server_ip;
36 warn "server ip $server::ip range: $server::ip_from - $server::ip_to\n";
38 my $addr = $server::ip_from;
43 my $conf = "$server::base_dir/conf/$server::ip";
44 mkdir $conf unless -e $conf;
46 if ( -e "$conf/mac/$mac" ) {
47 my $ip = read_file "$conf/mac/$mac";
48 print "RENEW $mac $ip\n";
52 my $p = Net::Ping->new;
54 my $prefix = $server::ip;
55 $prefix =~ s{\.\d+$}{.};
56 my $ip = $prefix . $addr;
57 while ( -e "$conf/ip/$ip" || $p->ping( $ip ) ) {
58 $ip = $prefix . $addr++;
59 die "all addresses allocated!" if $addr == $server::ip_to;
62 write_file "$conf/mac/$mac", $ip;
64 if ( -l "$conf/ip/$ip" && readlink "$conf/ip/$ip" ne "$conf/mac/$mac" ) {
65 unlink "$conf/ip/$ip";
66 warn "$mac IP changed from ", readlink "$conf/ip/$ip", " to $ip";
68 symlink "$conf/mac/$mac", "$conf/ip/$ip";
70 print "$mac NEW $ip\n";
80 our $transaction = 0; # FIXME predictible transaction numbers
88 $sock->recv($buf, 1024);
90 $size = length($buf) . ' bytes' if defined $buf;
92 print "packet from ",$sock->peerhost,":",$sock->peerport," $size\n" if $debug;
95 my $dhcp = Net::DHCP::Packet->new($buf);
96 $dhcp->comment( $transaction++ );
98 warn "recv: ", $dhcp->toString if $debug;
100 my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2);
101 my $ip = client_ip($mac);
105 my $user_class = $dhcp->getOptionValue(DHO_USER_CLASS());
107 if ( $user_class eq 'gPXE' ) {
109 } elsif ( ! $file ) {
110 $file = 'undionly.kpxe';
115 config::for_ip( $ip );
119 Hops => $dhcp->hops(),
121 Flags => $dhcp->flags(),
122 Ciaddr => $dhcp->ciaddr(),
124 Siaddr => $server::ip,
125 Giaddr => $dhcp->giaddr(),
126 Chaddr => $dhcp->chaddr(),
130 foreach my $opt ( 'magic', 'config_file', 'path_prefix', 'reboot_time' ) {
131 my $DH0 = eval 'DHO_PXELINUX_' . uc $opt;
132 warn "DH0: $@" if $@;
133 my $v = eval "\$pxelinux::$opt";
135 next unless defined $v;
136 warn "pxelinux dhcp option $opt = $DH0 = $v";
137 $packet->{ $DH0 } = $v;
140 my $messagetype = $dhcp->getOptionValue(DHO_DHCP_MESSAGE_TYPE());
142 if ($messagetype eq DHCPDISCOVER()) {
143 log::mac $mac, "DHCP DISCOVER";
144 $packet->{Comment} = $dhcp->comment();
145 $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPOFFER();
146 } elsif ($messagetype eq DHCPREQUEST()) {
147 my $requested_ip = $dhcp->getOptionValue(DHO_DHCP_REQUESTED_ADDRESS());
148 log::mac $mac, "DHCP REQUEST $requested_ip $ip $file";
149 if ( $ip eq $requested_ip ) {
150 $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPACK();
151 $packet->{DHO_DHCP_LEASE_TIME()} = 5 * 60; # 5 min
152 # $packet->{DHO_DHCP_SERVER_IDENTIFIER()} = $server::ip; # FIXME
153 $packet->{DHO_SUBNET_MASK()} = '255.255.255.0';
154 $packet->{DHO_ROUTERS()} = $server::ip;
155 $packet->{DHO_DOMAIN_NAME()} = 'pxelator.lan';
156 $packet->{DHO_NAME_SERVERS()} = $server::ip;
157 # $packet->{DHO_ROOT_PATH()} = '/exports/foobar';
159 $packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPNAK();
160 $packet->{DHO_DHCP_MESSAGE()} = "Bad request, expected $ip";
162 } elsif ($messagetype eq DHCPINFORM()) {
163 log::mac $mac, "DHCP INFORM ignored";
165 log::mac $mac, "$messagetype igored (bootp?)";
168 warn ">> $mac == $ip server: $server::ip", $file ? " file: $file\n" : "\n" if $debug;
170 warn "## created packet ", dump( $packet );
172 $packet = new Net::DHCP::Packet( %$packet );
173 warn "send ",$packet->toString() if $debug;
175 my $reply = IO::Socket::INET->new(
176 LocalAddr => $server::ip,
180 PeerAddr => '255.255.255.255',
183 ) or die "socket: $@";
185 my $buff = $packet->serialize();
186 $reply->send( $buff, 0 ) or die "Error sending: $!\n";
188 # system("arp -s $ip $mac"),
194 my $sock = IO::Socket::INET->new(
196 # LocalAddr => 'localhost',
197 # LocalAddr => '10.0.0.100',
198 LocalAddr => '0.0.0.0',
201 # PeerPort => getservbyname('bootpc', 'udp'),
204 ) or die "Failed to bind to socket: $@";
206 print "DHCP listen on ",$sock->sockhost,":",$sock->sockport,"\n";
209 process_packet $sock;