#!/usr/bin/perl -w

# Brian Masney <masneyb@ntelos.net>

# To use this script, set your base DN below. Then run 

# ./dhcpd-conf-to-ldap.pl < /path-to-dhcpd-conf/dhcpd.conf > output-file

# The output of this script will generate entries in LDIF format. You can use

# the slapadd command to add these entries into your LDAP server. You will

# definately want to double check that your LDAP entries are correct before

# you load them into LDAP.

# This script does not do much error checking. Make sure before you run this

# that the DHCP server doesn't give any errors about your config file

use Sys::Hostname;

my $basedn = "dc=ntelos, dc=net";

sub next_token

{

  local ($lowercase) = @_;

  local ($token, $newline);

  do 

    {

      if (!defined ($line) || length ($line) == 0)

        {

          $line = <>;

          return undef if !defined ($line);

          chop $line;

          $line_number++;

          $token_number = 0;

        }

      $line =~ s/#.*//;

      $line =~ s/^\s+//;

      $line =~ s/\s+$//;

    }

  while (length ($line) == 0);

  if (($token, $newline) = $line =~ /^(.*?)\s+(.*)/)

    {

      $line = $newline;

    }

  else

    {

      $token = $line;

      $line = '';

    }

  $token_number++;

  $token =~ y/[A-Z]/[a-z]/ if $lowercase;

  return ($token);

}

sub remaining_line

{

  local ($tmp, $str);

  $str = "";

  while (($tmp = next_token (0)))

    {

      $str .= ' ' if !($str eq "");

      $str .= $tmp;

      last if $tmp =~ /;\s*$/;

    }

  $str =~ s/;$//;

  return ($str);

}

sub

add_dn_to_stack

{

  local ($dn) = @_;

  $current_dn = "$dn, $current_dn";

}

sub

remove_dn_from_stack

{

  $current_dn =~ s/^.*?,\s*//;

}

sub

parse_error

{

  print "Parse error on line number $line_number at token number $token_number\n";

  exit (1);

}

sub

print_entry

{

  return if (scalar keys %curentry == 0);

  if (!defined ($curentry{'type'}))

    {

      $host = hostname ();

      $hostdn = "cn=$host, $basedn";

      print "dn: $hostdn\n";

      print "objectClass: top\n";

      print "objectClass: dhcpServer\n";

      print "cn: $host\n";

      print "dhcpServiceDN: $current_dn\n\n";

      print "dn: $current_dn\n";

      print "cn: DHCP Config\n";

      print "objectClass: top\n";

      print "objectClass: dhcpService\n";

      if (defined ($curentry{'options'}))

        {

          print "objectClass: dhcpOptions\n";

        }

      print "dhcpPrimaryDN: $hostdn\n";

    }

  elsif ($curentry{'type'} eq 'subnet')

    {

      print "dn: $current_dn\n";

      print "cn: " . $curentry{'ip'} . "\n";

      print "objectClass: top\n";

      print "objectClass: dhcpSubnet\n";

      if (defined ($curentry{'options'}))

        {

          print "objectClass: dhcpOptions\n";

        }

      print "dhcpNetMask: " . $curentry{'netmask'} . "\n";

      if (defined ($curentry{'range'}))

        {

          print "dhcpRange: " . $curentry{'range'} . "\n";

        }

    }

  elsif ($curentry{'type'} eq 'shared-network')

    {

      print "dn: $current_dn\n";

      print "cn: " . $curentry{'descr'} . "\n";

      print "objectClass: top\n";

      print "objectClass: dhcpSharedNetwork\n";

      if (defined ($curentry{'options'}))

        {

          print "objectClass: dhcpOptions\n";

        }

    }

  elsif ($curentry{'type'} eq 'group')

    {

      print "dn: $current_dn\n";

      print "cn: group\n";

      print "objectClass: top\n";

      print "objectClass: dhcpGroup\n";

      if (defined ($curentry{'options'}))

        {

          print "objectClass: dhcpOptions\n";

        }

    }

  elsif ($curentry{'type'} eq 'host')

    {

      print "dn: $current_dn\n";

      print "cn: " . $curentry{'host'} . "\n";

      print "objectClass: top\n";

      print "objectClass: dhcpHost\n";

      if (defined ($curentry{'options'}))

        {

          print "objectClass: dhcpOptions\n";

        }

      if (defined ($curentry{'hwaddress'}))

        {

          print "dhcpHWAddress: " . $curentry{'hwaddress'} . "\n";

        }

    }

  elsif ($curentry{'type'} eq 'pool')

    {

      print "dn: $current_dn\n";

      print "cn: pool\n";

      print "objectClass: top\n";

      print "objectClass: dhcpPool\n";

      if (defined ($curentry{'options'}))

        {

          print "objectClass: dhcpOptions\n";

        }

      if (defined ($curentry{'range'}))

        {

          print "dhcpRange: " . $curentry{'range'} . "\n";

        }

    }

  elsif ($curentry{'type'} eq 'class')

    {

      print "dn: $current_dn\n";

      print "cn: " . $curentry{'class'} . "\n";

      print "objectClass: top\n";

      print "objectClass: dhcpClass\n";

      if (defined ($curentry{'options'}))

        {

          print "objectClass: dhcpOptions\n";

        }

    }

  elsif ($curentry{'type'} eq 'subclass')

    {

      print "dn: $current_dn\n";

      print "cn: " . $curentry{'subclass'} . "\n";

      print "objectClass: top\n";

      print "objectClass: dhcpSubClass\n";

      if (defined ($curentry{'options'}))

        {

          print "objectClass: dhcpOptions\n";

        }

      print "dhcpClassData: " . $curentry{'class'} . "\n";

    }

  if (defined ($curentry{'statements'}))

    {

      foreach $statement (@{$curentry{'statements'}})

        {

          print "dhcpStatements: $statement\n";

        }

    }

  if (defined ($curentry{'options'}))

    {

      foreach $statement (@{$curentry{'options'}})

        {

          print "dhcpOption: $statement\n";

        }

    }

  print "\n";

  undef (%curentry);

}

sub parse_netmask

{

  local ($netmask) = @_;

  local ($i);

  if ((($a, $b, $c, $d) = $netmask =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/) != 4)

    {

      parse_error ();

    }

  $num = (($a & 0xff) << 24) |

         (($b & 0xff) << 16) |

         (($c & 0xff) << 8) |

          ($d & 0xff);

  for ($i=1; $i<=32 && $num & (1 << (32 - $i)); $i++)

    {

    }

  $i--;

  return ($i);

}

sub parse_subnet

{

  local ($ip, $tmp, $netmask);

  print_entry () if %curentry;

  $ip = next_token (0);

  parse_error () if !defined ($ip);

  $tmp = next_token (1);

  parse_error () if !defined ($tmp);

  parse_error () if !($tmp eq 'netmask');

  $tmp = next_token (0);

  parse_error () if !defined ($tmp);

  $netmask = parse_netmask ($tmp);

  $tmp = next_token (0);

  parse_error () if !defined ($tmp);

  parse_error () if !($tmp eq '{');

  add_dn_to_stack ("cn=$ip");

  $curentry{'type'} = 'subnet';

  $curentry{'ip'} = $ip;

  $curentry{'netmask'} = $netmask;

}

sub parse_shared_network

{

  local ($descr, $tmp);

  print_entry () if %curentry;

  $descr = next_token (0);

  parse_error () if !defined ($descr);

  $tmp = next_token (0);

  parse_error () if !defined ($tmp);

  parse_error () if !($tmp eq '{');

  add_dn_to_stack ("cn=$descr");

  $curentry{'type'} = 'shared-network';

  $curentry{'descr'} = $descr;

}

sub parse_host

{

  local ($descr, $tmp);

  print_entry () if %curentry;

  $host = next_token (0);

  parse_error () if !defined ($host);

  $tmp = next_token (0);

  parse_error () if !defined ($tmp);

  parse_error () if !($tmp eq '{');

  add_dn_to_stack ("cn=$host");

  $curentry{'type'} = 'host';

  $curentry{'host'} = $host;

}

sub parse_group

{

  local ($descr, $tmp);

  print_entry () if %curentry;

  $tmp = next_token (0);

  parse_error () if !defined ($tmp);

  parse_error () if !($tmp eq '{');

  add_dn_to_stack ("cn=group");

  $curentry{'type'} = 'group';

}

sub parse_pool

{

  local ($descr, $tmp);

  print_entry () if %curentry;

  $tmp = next_token (0);

  parse_error () if !defined ($tmp);

  parse_error () if !($tmp eq '{');

  add_dn_to_stack ("cn=pool");

  $curentry{'type'} = 'pool';

}

sub parse_class

{

  local ($descr, $tmp);

  print_entry () if %curentry;

  $class = next_token (0);

  parse_error () if !defined ($class);

  $tmp = next_token (0);

  parse_error () if !defined ($tmp);

  parse_error () if !($tmp eq '{');

  $class =~ s/\"//g;

  add_dn_to_stack ("cn=$class");

  $curentry{'type'} = 'class';

  $curentry{'class'} = $class;

}

sub parse_subclass

{

  local ($descr, $tmp);

  print_entry () if %curentry;

  $class = next_token (0);

  parse_error () if !defined ($class);

  $subclass = next_token (0);

  parse_error () if !defined ($subclass);

  $tmp = next_token (0);

  parse_error () if !defined ($tmp);

  parse_error () if !($tmp eq '{');

  add_dn_to_stack ("cn=$subclass");

  $curentry{'type'} = 'subclass';

  $curentry{'class'} = $class;

  $curentry{'subclass'} = $subclass;

}

sub parse_hwaddress

{

  local ($type, $hw, $tmp);

  $type = next_token (0);

  parse_error () if !defined ($type);

  $hw = next_token (0);

  parse_error () if !defined ($hw);

  $hw =~ s/;$//;

  $curentry{'hwaddress'} = "$type $hw";

}

sub parse_range

{

  local ($tmp, $str);

  $str = remaining_line ();

  if (!($str eq ''))

    {

      $str =~ s/;$//;

      $curentry{'range'} = $str;

    }

}

sub parse_statement

{

  local ($token) = shift;

  local ($str);

  if ($token eq 'option')

    {

      $str = remaining_line ();

      push (@{$curentry{'options'}}, $str);

    }

  else

    {

      $str = $token . " " . remaining_line ();

      push (@{$curentry{'statements'}}, $str);

    }

}

my $token;

my $token_number = 0;

my $line_number = 0;

my %curentry;

$current_dn = "cn=DHCP Config, $basedn";

$curentry{'descr'} = 'DHCP Config';

$line = '';

while (($token = next_token (1)))

  {

    if ($token eq '}')

      {

        print_entry () if %curentry;

        remove_dn_from_stack ();

      }

    elsif ($token eq 'subnet')

      {

        parse_subnet ();

        next;

      }

    elsif ($token eq 'shared-network')

      {

        parse_shared_network ();

        next;

      }

    elsif ($token eq 'class')

      {

        parse_class ();

        next;

      }

    elsif ($token eq 'subclass')

      {

        parse_subclass ();

        next;

      }

    elsif ($token eq 'pool')

      {

        parse_pool ();

        next;

      }

    elsif ($token eq 'group')

      {

        parse_group ();

        next;

      }

    elsif ($token eq 'host')

      {

        parse_host ();

        next;

      }

    elsif ($token eq 'hardware')

      {

        parse_hwaddress ();

        next;

      }

    elsif ($token eq 'range')

      {

        parse_range ();

        next;

      }

    else

      {

        parse_statement ($token);

        next;

      }

  }