#!/usr/local/bin/perl
# find_free.cgi
# Looks for free IP numbers
# by Ivan Andrian, <ivan.andrian@elettra.trieste.it>, 11/07/2000

require './bind8-lib.pl';
&ReadParse();
$zone = &get_zone_name($in{'index'}, $in{'view'});
$conf = &get_config();
if ($in{'view'} ne '') {
	$conf = $conf->[$in{'view'}]->{'members'};
	}
$zconf = $conf->[$in{'index'}]->{'members'};
$type = &find("type", $zconf)->{'value'};
$file = &find("file", $zconf)->{'value'};
$dom = $conf->[$in{'index'}]->{'value'};
if (!$access{'findfree'}) {&error($text{'findfree_nofind'})};
$desc = &text('findfree_header', &arpa_to_ip($dom));
&ui_print_header($desc, &text('findfree_title'), "",
		 undef, undef, undef, undef, &restart_links($zone));

&find_ips($in{'index'}, $in{'from'}, $in{'to'}, $in{'cf'});

if ($in{'from'} && $in{'to'}) {
   # Do the search
   @recs = &read_zone_file($file, $dom);
   @recs = grep { ($_->{'type'} eq 'A') || ($_->{'type'} eq 'PTR')} @recs;
   my $freeXXXcount=0;
   my $freemaccount=0;
   if (@recs) {
	@recs = &sort_records(@recs);
	my %frecs = &build_iprange($in{'from'}, $in{'to'});

	for($i=0; $i<@recs; $i++) {
		my $hip;	# host IP
		my $hname;	# hostname
		
		if ($recs[$i]->{'type'} eq 'A') {
			$hip=$recs[$i]->{'values'}->[0]; 		# IP no. in 'values' field
			$hname=$recs[$i]->{'name'};				# name   in 'name' field
		}
		else {
			$hip=&arpa_to_ip($recs[$i]->{'name'});	# IP no. in 'name' field
			$hname=$recs[$i]->{'values'}->[0];		# name   in 'values' field
		}
		
#	print "evaluating ", $hip, " ", $hname, "...<BR>"; #debug
		
		if($in{'cf'} & ($hname=~ /^free.*/) & exists $frecs{$hip}) {	# 'freeXXX' hostnames are free IP's!
			# update
#	print "&nbsp;&nbsp;updating: ",$hip, "... <BR>"; #debug
			$frecs{$hip}->{'ttl'}=$recs[$i]->{'ttl'};
			$frecs{$hip}->{'name'}=$hname;
			$freeXXXcount++;
			if($hname=~ /^freemac.*/) {$freemaccount++;}
		}
		else {
#	print "&nbsp;&nbsp;deleting: ",$hip, "... <BR>"; #debug
			delete $frecs{$hip};
		}
	}
	
	
        # Show a message
	my @frecs=sort ffree_ip_sort_func values %frecs; 
	print "<b>",&text('findfree_msg', scalar(@frecs)),"\n";
	if ($in{'cf'}) {
		print &text('findfree_msg2', $freeXXXcount, $freemaccount),"\n";
		}
	print "...</b><p>\n";

	# Show all the IPs
	&frecs_table(@frecs);

    } # if(@recs)
} # if(@in >= 3)

&ui_print_footer("edit_$type.cgi?index=$in{'index'}&view=$in{'view'}",
	$text{'recs_return'});

# build_iprange(fromIP, toIP)
# Returns a list of IP numbers from fromIP to toIP
sub build_iprange
{
$_[0] =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)/;
my @from = ($1, $2, $3, $4);
return @from if (@from != 4); #I want a correct IPv4 #
$_[1] =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)/;
my @to = ($1, $2, $3, $4);
return @to if (@to != 4);

for ($i=0;$i<4;$i++) {
	$from[$i]=$from[$i]==0?1:$from[$i];
	$to[$i]=$to[$i]==255?254:$to[$i];
}

my %frecs;

for ($byte0=$from[0]; $byte0<=$to[0]; $byte0++) {
	for ($byte1=$byte0==$from[0]?$from[1]:1;
			$byte1<=(($byte0==$to[0]?$to[1]:254));
			$byte1++) {
		##print "================<BR>";
		for ($byte2=($byte0==$from[0])&&($byte1==$from[1])?$from[2]:1;
				$byte2<=(($byte0==$to[0])&&($byte1==$to[1])?$to[2]:254);
				$byte2++) {
			##print "----------------<BR>";
			for ($byte3=($byte0==$from[0])&&($byte1==$from[1])&&($byte2==$from[2])?$from[3]:1;
					$byte3<=(($byte0==$to[0])&&($byte1==$to[1])&&($byte2==$to[2])?$to[3]:254);
					$byte3++) {
				$frecs{"$byte0.$byte1.$byte2.$byte3"}->{'ip'}="$byte0.$byte1.$byte2.$byte3";
				$frecs{"$byte0.$byte1.$byte2.$byte3"}->{'ttl'}=$text{'default'};
				$frecs{"$byte0.$byte1.$byte2.$byte3"}->{'name'}='';
				##push(@frecs, "$byte0.$byte1.$byte2.$byte3");
				##print "$byte0.$byte1.$byte2.$byte3<BR>";
			} #for $byte3
		} #for $byte2
	} #for $byte1
} #for $byte0

return %frecs;
} # sub build_iprange

# find_ips (zoneindex, from_ip, to_ip, consider_freeXX_names)
# Display a form for searching for free IP nos
sub find_ips
{
print &ui_form_start("find_free.cgi");
print &ui_hidden("index", $_[0]);
print &ui_hidden("view", $in{'view'});
print &ui_table_start($text{'findfree_sopt'}, undef, 2);

# Range start
print &ui_table_row($text{'findfree_fromip'},
	&ui_textbox("from", $_[1], 20));

# Range end
print &ui_table_row($text{'findfree_toip'},
	&ui_textbox("to", $_[2], 20));

# Handle freeXXX hostnames?
print &ui_table_row($text{'findfree_cf'},
	&ui_yesno_radio("cf", $_[3]));

print &ui_table_end();
print &ui_form_end([ [ undef, $text{'findfree_search'} ] ]);
}

# frecs_table(array_of_freerecords)
sub frecs_table
{
print &ui_grid_table(
	[ map { "<a href='edit_recs.cgi?index=$in{'index'}&view=$in{'view'}".
		"&type=A&newvalue=$_->{'ip'}'>$_->{'ip'}</a>" } @_ ],
	4, 100, [ "width=25%", "width=25%", "width=25%", "width=25%" ]);
}

sub ffree_ip_sort_func
{
$a->{'ip'} =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)/;
local ($a1, $a2, $a3, $a4) = ($1, $2, $3, $4);
$b->{'ip'} =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)/;
return	$a1 < $1 ? -1 :
	$a1 > $1 ? 1 :
	$a2 < $2 ? -1 :
	$a2 > $2 ? 1 :
	$a3 < $3 ? -1 :
	$a3 > $3 ? 1 :
	$a4 < $4 ? -1 :
	$a4 > $4 ? 1 : 0;
}


#EOF