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use strict; |
use strict; |
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use warnings; |
use warnings; |
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use autodie; |
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use IO::Socket::INET; |
use IO::Socket::INET; |
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use Net::DHCP::Packet; |
use File::Slurp; |
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use Net::DHCP::Constants; |
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use Data::Dump qw/dump/; |
use Data::Dump qw/dump/; |
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use lib 'lib'; |
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use Net::DHCP::Packet; |
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use Net::DHCP::Constants 0.67; |
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die "need to run $0 as root like this\nsudo $0\n" unless $< == 0; |
die "need to run $0 as root like this\nsudo $0\n" unless $< == 0; |
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my $debug = shift @ARGV; |
my $debug = shift @ARGV; |
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our $server_ip; |
our ( $file, $gpxe_file ); |
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require "config.pl"; |
our ( $ip_from, $ip_to ) = ( 10, 100 ); |
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our $server_ip = readlink 'conf/server.ip' if -l 'conf/server.ip'; |
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if ( ! $server_ip ) { |
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$server_ip = `/sbin/ifconfig`; |
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$server_ip =~ s/^.+?addr:([\d\.]+).*$/$1/gs; |
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warn "auto-configure server ip to $server_ip\n"; |
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} else { |
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warn "server ip $server_ip\n"; |
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} |
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my $sock = IO::Socket::INET->new( |
my $sock = IO::Socket::INET->new( |
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LocalPort => 67, |
LocalPort => 67, |
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Type => SOCK_DGRAM, |
Type => SOCK_DGRAM, |
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) or die "Failed to bind to socket: $@"; |
) or die "Failed to bind to socket: $@"; |
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my $_ip = 10; |
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my $_mac2ip; |
my $addr = $ip_from; |
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my $_ip_file; |
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sub client_ip { |
sub client_ip { |
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my ( $mac ) = @_; |
my ( $mac ) = @_; |
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my $ip = $_mac2ip->{$mac}; |
my $conf = "conf/$server_ip"; |
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return $ip if $ip; |
mkdir $conf unless -e $conf; |
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if ( -e "$conf/mac/$mac" ) { |
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my $ip = read_file "$conf/mac/$mac"; |
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print "$mac old $ip\n"; |
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return $ip; |
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} |
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$ip = "10.0.0.$_ip"; |
mkdir $_ foreach grep { ! -e $_ } map { "$conf/$_" } ( 'ip', 'mac' ); |
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$_mac2ip->{$mac} = $ip; |
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$_ip++; |
my $prefix = $server_ip; |
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if ( $_ip == 100 ) { |
$prefix =~ s{\.\d+$}{.}; |
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warn "IP roll-over to 10\n"; |
my $ip = $prefix . $addr; |
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$_ip = 10; |
while ( -e "conf/ip/$ip" ) { |
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$ip = $prefix . $addr++; |
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die "all addresses allocated!" if $addr == $ip_to; |
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} |
} |
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write_file "$conf/mac/$mac", $ip; |
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unlink "$conf/ip/$ip" if -e "$conf/ip/$ip"; |
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symlink "$conf/mac/$mac", "$conf/ip/$ip"; |
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print "$mac NEW $ip\n"; |
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return $ip; |
return $ip; |
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} |
} |
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my $transaction = 0; # FIXME predictible transaction numbers |
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while (1) { |
while (1) { |
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require "config.pl"; # refresh config |
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print "waiting for DHCP requests on ",$sock->sockhost,":",$sock->sockport,"\n"; |
print "waiting for DHCP requests on ",$sock->sockhost,":",$sock->sockport,"\n"; |
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my $buf; |
my $buf; |
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$sock->recv($buf, 1024); |
$sock->recv($buf, 1024); |
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print "<< peer:",$sock->peerhost,":",$sock->peerport,"\n"; |
print "<< ",$sock->peerhost,":",$sock->peerport,"\n"; |
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if (defined $buf) { |
if (defined $buf) { |
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my $dhcp; |
my $dhcp = Net::DHCP::Packet->new($buf); |
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$dhcp->comment( $transaction++ ); |
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eval { $dhcp = Net::DHCP::Packet->new($buf); }; |
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die "can't use request", dump( $buf ) if $@; |
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if ( $debug ) { |
warn "recv: ", $dhcp->toString, "\n\n"; |
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warn "recv: ", $dhcp->toString, "\n\n"; |
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} |
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my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2); |
my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2); |
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my $ip = client_ip($mac); |
my $ip = client_ip($mac); |
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my $user_class = $dhcp->getOptionValue(DHO_USER_CLASS()); |
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if ( $user_class eq 'gPXE' ) { |
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$file = $gpxe_file; |
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} elsif ( ! $file ) { |
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$file = 'undionly.kpxe'; |
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} |
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my $packet = new Net::DHCP::Packet( |
my $packet = { |
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Op => BOOTREPLY(), |
Op => BOOTREPLY(), |
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Hops => $dhcp->hops(), |
Hops => $dhcp->hops(), |
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Xid => $dhcp->xid(), |
Xid => $dhcp->xid(), |
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Siaddr => $server_ip, |
Siaddr => $server_ip, |
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Giaddr => $dhcp->giaddr(), |
Giaddr => $dhcp->giaddr(), |
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Chaddr => $dhcp->chaddr(), |
Chaddr => $dhcp->chaddr(), |
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File => 'undionly.kpxe', |
File => $file, |
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# DHO_DHCP_MESSAGE_TYPE() => DHCPACK(), |
# DHO_DHCP_MESSAGE_TYPE() => DHCPACK(), |
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DHO_SUBNET_MASK() => '255.0.0.0', |
# DHO_SUBNET_MASK() => '255.255.255.0', |
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); |
}; |
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my $messagetype = $dhcp->getOptionValue(DHO_DHCP_MESSAGE_TYPE()); |
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if ($messagetype eq DHCPDISCOVER()) { |
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warn "DHCP DISCOVER"; |
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$packet->{Comment} = $dhcp->comment(); |
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$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPOFFER(); |
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} elsif ($messagetype eq DHCPREQUEST()) { |
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my $requested_ip = $dhcp->getOptionValue(DHO_DHCP_REQUESTED_ADDRESS()); |
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warn "DHCP REQUEST $requested_ip"; |
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if ( $ip eq $requested_ip ) { |
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$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPACK(); |
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$packet->{DHO_DHCP_LEASE_TIME()} = 100; |
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} else { |
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$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPNAK(); |
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$packet->{DHO_DHCP_MESSAGE()} = "Bad request, expected $ip"; |
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} |
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} elsif ($messagetype eq DHCPINFORM()) { |
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warn "DHCP INFORM ignored"; |
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} else { |
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warn "$messagetype igored (bootp?)"; |
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} |
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warn ">> $mac == $ip server: $server_ip", $file ? " file: $file\n" : "\n"; |
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warn ">> $mac == $ip server $server_ip\n"; |
$packet = new Net::DHCP::Packet( %$packet ); |
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warn "## ",$packet->toString(),"\n" if $debug; |
warn "## ",$packet->toString(),"\n" if $debug; |
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my $reply = IO::Socket::INET->new( |
my $reply = IO::Socket::INET->new( |