8 |
use IO::Socket::INET; |
use IO::Socket::INET; |
9 |
use Net::DHCP::Packet; |
use Net::DHCP::Packet; |
10 |
use Net::DHCP::Constants; |
use Net::DHCP::Constants; |
11 |
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use File::Slurp; |
12 |
use Data::Dump qw/dump/; |
use Data::Dump qw/dump/; |
13 |
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|
14 |
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; |
15 |
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|
16 |
my $debug = shift @ARGV; |
my $debug = shift @ARGV; |
17 |
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18 |
our ( $server_ip, $next_file ); |
our ( $file, $next_file ); |
19 |
require "config.pl"; |
our ( $ip_from, $ip_to ) = ( 10, 100 ); |
20 |
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21 |
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our $server_ip = readlink 'conf/server.ip'; |
22 |
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23 |
my $sock = IO::Socket::INET->new( |
my $sock = IO::Socket::INET->new( |
24 |
LocalPort => 67, |
LocalPort => 67, |
32 |
Type => SOCK_DGRAM, |
Type => SOCK_DGRAM, |
33 |
) or die "Failed to bind to socket: $@"; |
) or die "Failed to bind to socket: $@"; |
34 |
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|
35 |
my $_ip = 10; |
|
36 |
my $_mac2ip; |
my $addr = $ip_from; |
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my $_ip_file; |
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37 |
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38 |
sub client_ip { |
sub client_ip { |
39 |
my ( $mac ) = @_; |
my ( $mac ) = @_; |
40 |
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|
41 |
my $ip = $_mac2ip->{$mac}; |
my $conf = "conf/$server_ip"; |
42 |
return $ip if $ip; |
mkdir $conf unless -e $conf; |
43 |
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|
44 |
$ip = "10.0.0.$_ip"; |
if ( -e "$conf/$mac" ) { |
45 |
$_mac2ip->{$mac} = $ip; |
my $ip = read_file "conf/mac/$mac"; |
46 |
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print "$mac old $ip\n"; |
47 |
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return $ip; |
48 |
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} |
49 |
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|
50 |
$_ip++; |
mkdir $_ foreach grep { ! -e $_ } map { "$conf/$_" } ( 'ip', 'mac' ); |
51 |
if ( $_ip == 100 ) { |
|
52 |
warn "IP roll-over to 10\n"; |
my $prefix = $server_ip; |
53 |
$_ip = 10; |
$prefix =~ s{\.\d+$}{.}; |
54 |
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my $ip = $prefix . $addr; |
55 |
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while ( -e "conf/ip/$ip" ) { |
56 |
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$ip = $prefix . $addr++; |
57 |
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die "all addresses allocated!" if $addr == $ip_to; |
58 |
} |
} |
59 |
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60 |
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write_file "$conf/mac/$mac", $ip; |
61 |
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symlink "$conf/mac/$mac", "conf/ip/$ip"; |
62 |
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63 |
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print "$mac NEW $ip\n"; |
64 |
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|
65 |
return $ip; |
return $ip; |
66 |
} |
} |
67 |
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|
68 |
while (1) { |
while (1) { |
69 |
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70 |
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require "config.pl"; # refresh config |
71 |
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72 |
print "waiting for DHCP requests on ",$sock->sockhost,":",$sock->sockport,"\n"; |
print "waiting for DHCP requests on ",$sock->sockhost,":",$sock->sockport,"\n"; |
73 |
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|
74 |
my $buf; |
my $buf; |
75 |
$sock->recv($buf, 1024); |
$sock->recv($buf, 1024); |
76 |
print "<< peer:",$sock->peerhost,":",$sock->peerport,"\n"; |
print "<< ",$sock->peerhost,":",$sock->peerport,"\n"; |
77 |
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|
78 |
if (defined $buf) { |
if (defined $buf) { |
79 |
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|
89 |
my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2); |
my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2); |
90 |
my $ip = client_ip($mac); |
my $ip = client_ip($mac); |
91 |
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92 |
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if ( ! $file ) { |
93 |
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if ( $dhcp->getOptionValue(DHO_USER_CLASS()) ne 'gPXE' ) { |
94 |
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$file = 'undionly.kpxe'; |
95 |
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} else { |
96 |
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$file = $next_file; |
97 |
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} |
98 |
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} |
99 |
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|
100 |
my $packet = new Net::DHCP::Packet( |
my $packet = new Net::DHCP::Packet( |
101 |
Op => BOOTREPLY(), |
Op => BOOTREPLY(), |
102 |
Hops => $dhcp->hops(), |
Hops => $dhcp->hops(), |
107 |
Siaddr => $server_ip, |
Siaddr => $server_ip, |
108 |
Giaddr => $dhcp->giaddr(), |
Giaddr => $dhcp->giaddr(), |
109 |
Chaddr => $dhcp->chaddr(), |
Chaddr => $dhcp->chaddr(), |
110 |
File => $_ip_file->{$ip} || 'undionly.kpxe', |
File => $file, |
111 |
# DHO_DHCP_MESSAGE_TYPE() => DHCPACK(), |
# DHO_DHCP_MESSAGE_TYPE() => DHCPACK(), |
112 |
DHO_SUBNET_MASK() => '255.0.0.0', |
DHO_SUBNET_MASK() => '255.0.0.0', |
113 |
); |
); |
114 |
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$_ip_file->{$ip} = $next_file; |
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|
115 |
warn ">> $mac == $ip server $server_ip\n"; |
warn ">> $mac == $ip server $server_ip\n"; |
116 |
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117 |
warn "## ",$packet->toString(),"\n" if $debug; |
warn "## ",$packet->toString(),"\n" if $debug; |