/[pxelator]/bin/dhcpd.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Diff of /bin/dhcpd.pl

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revision 12 by dpavlin, Mon Jul 27 22:18:51 2009 UTC revision 17 by dpavlin, Tue Jul 28 10:29:33 2009 UTC
# Line 8  use warnings; Line 8  use warnings;
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    use File::Slurp;
12  use Data::Dump qw/dump/;  use Data::Dump qw/dump/;
13    
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    
16  my $debug = shift @ARGV;  my $debug = shift @ARGV;
17    
18  our ( $server_ip, $file, $next_file );  our ( $file, $next_file );
19    our ( $ip_from, $ip_to ) = ( 10, 100 );
20    
21    our $server_ip = readlink 'conf/server.ip';
22    
23  my $sock = IO::Socket::INET->new(  my $sock = IO::Socket::INET->new(
24          LocalPort       => 67,          LocalPort       => 67,
# Line 28  my $sock = IO::Socket::INET->new( Line 32  my $sock = IO::Socket::INET->new(
32          Type            => SOCK_DGRAM,          Type            => SOCK_DGRAM,
33  ) or die "Failed to bind to socket: $@";  ) or die "Failed to bind to socket: $@";
34    
35  my $_ip = 10;  
36  my $_mac2ip;  my $addr = $ip_from;
37    
38  sub client_ip {  sub client_ip {
39          my ( $mac ) = @_;          my ( $mac ) = @_;
40    
41          my $ip = $_mac2ip->{$mac};          my $conf = "conf/$server_ip";
42          return $ip if $ip;          mkdir $conf unless -e $conf;
43    
44          $ip = $server_ip;          if ( -e "$conf/$mac" ) {
45          $ip =~ s{\.\d+$}{.$_ip};                  my $ip = read_file "conf/mac/$mac";
46          $_mac2ip->{$mac} = $ip;                  print "$mac old $ip\n";
47                    return $ip;
         $_ip++;  
         if ( $_ip == 100 ) {  
                 warn "IP roll-over to 10\n";  
                 $_ip = 10;  
48          }          }
49    
50            mkdir $_ foreach grep { ! -e $_ } map { "$conf/$_" } ( 'ip', 'mac' );
51    
52            my $prefix = $server_ip;
53            $prefix =~ s{\.\d+$}{.};
54            my $ip = $prefix . $addr;
55            while ( -e "conf/ip/$ip" ) {
56                    $ip = $prefix . $addr++;
57                    die "all addresses allocated!" if $addr == $ip_to;
58            }
59    
60            write_file "$conf/mac/$mac", $ip;
61            symlink    "$conf/mac/$mac", "conf/ip/$ip";
62    
63            print "$mac NEW $ip\n";
64    
65          return $ip;          return $ip;
66  }  }
67    
# Line 58  while (1) { Line 73  while (1) {
73    
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    
78          if (defined $buf) {          if (defined $buf) {
79    

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