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mkrdns.dist
executable file
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mkrdns.dist
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#!/usr/bin/perl
#
# mkrdns - Make Reverse DNS - Version 3.3
#
# By: Theo Van Dinter (felicity@mkrdns.org) (c) 1998-2002
# Revision Info: $Id: mkrdns,v 1.59 2002/12/05 21:19:28 felicity Stab $
#
# The goal of this script is to automatically generate new reverse IP
# mapping zone files for DNS/BIND. It's been done before, but there
# always seems to be something which makes it not workable in my
# environment. This script fixes that problem by adapting as necessary.
#
# Feel free to subscribe to the mkrdns mailing list. Instructions are
# available from the mkrdns web page: http://www.mkrdns.org/ The list is
# available to discuss mkrdns-related topics (mkrdns, DNS, etc.) and is
# also used to announce new versions of mkrdns.
#
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
use strict;
use Getopt::Long;
use POSIX qw(strftime);
# User Specified variables (commandline)
my ($debug) = 0; # display debugging information (user)
my ($help) = 0; # help screen (user)
my ($bootfile) = ""; # configuration file to use (user)
my ($ext) = ""; # extension for output files (user)
my ($quiet) = 0; # show errors only, or warnings too?
my ($version) = 0; # show version information
my ($rootdir) = "/"; # root directory for files
# Program needed variables
my ( $i, @domains, %networks, %maps, %serial, %mips, %hash, %netmap, @toskip );
my ( %zonetoskip, $nameddir, %numordate, %files, $toskip, $ignoreslaves );
my ($pversion) = "3.3";
my ($whichhash) = undef; # which hash function to use
# Get commandline parameters
$i = &GetOptions(
"debug" => \$debug,
"help|h" => \$help,
"extension=s" => \$ext,
"quiet" => \$quiet,
"version" => \$version,
"rootdir=s" => \$rootdir,
"hash=i" => \$whichhash,
"<>" => sub { $bootfile = $_[0] }, # any "non-option" is
# config (boot) file
);
if ( $version || !$i || $help ) {
print "
mkrdns v$pversion (c) 1998-2002
By: Theo Van Dinter (felicity\@mkrdns.org)
";
print "Usage: $0 [options] [configuration file]
Options:
-debug\t\tTurn on debugging (warning, this prints a *LOT* of info)
-extension\tAppend given extension to output files
-help\t\tShow this help screen
-quiet\t\tTurn off warning messages (multiple A records -> IP, etc.)
-rootdir\tSpecify the root directory that named will run in (chroot)
-version\tShow the mkrdns version information
Configuration file is the full path to either named.boot or named.conf.
If not specified, mkrdns will search common locations for the files.
" unless ($version);
exit 0;
}
warn "(warn) The --hash option is depricated, just using 32-bit CRC built-in.\n"
if ( defined $whichhash );
if ( $ext =~ /^\./ ) { # Remove the '.'s from the start of the extention ...
$ext =~ s/^\.+//;
warn "(warn) Extension started with '.' -- removed. Extention now '$ext'.\n";
}
if ($debug) {
print "Debugging turned on.\n", "Version = $pversion\n",
'C. Revision = $Id: mkrdns,v 1.59 2002/12/05 21:19:28 felicity Stab $',
"\n", "Help = $help\n", "Quiet Mode = $quiet\n",
"Root Dir = $rootdir\n";
print "Extension = $ext\n" if ($ext);
print "Hash Func = 32-bit checksum\n";
print "\n";
}
$rootdir = &FixPath($rootdir);
if ( $rootdir !~ m#^/# || $rootdir =~ m#^/?\.\.(/|$)# ) {
die qq{(fatal) Root directory ("$rootdir") is invalid.\n};
}
# If bootfile wasn't specified, try to find one in standard locations ...
unless ($bootfile) {
my ($stdloc);
my (@locs) = qw{ /etc /var/named /usr/named /usr/local/etc
/usr/freeware/etc /etc/named /etc/bind };
warn
"(warn) No configuration file specified. Checking in standard locations ...\n";
foreach $stdloc (@locs) {
opendir( DIR, $stdloc ) || next;
my (@files) = grep( /^named\.(boot|conf)$/, readdir(DIR) );
closedir(DIR);
print "(debug) Config files found in $stdloc: ", join ( ",", @files ), "\n"
if ($debug);
if ( $#files == -1 ) { # named.boot and named.conf weren't found, exit.
print
qq{(debug) Neither named.boot nor named.conf were found in "$stdloc".\n}
if ($debug);
}
elsif ( $#files == 0 ) { # one file was found, use it.
$bootfile = "$stdloc/$files[0]";
warn "(info) $bootfile was found.\n";
}
else { # more than one file was found, use the "best" one.
$bootfile = "$stdloc/named.conf";
warn "(info) Multiple configuration files were found, using $bootfile.\n";
}
last if ($bootfile);
}
die
"(die) Couldn't find either named.boot or named.conf in any standard location. Exiting.\n"
unless ($bootfile);
}
READCONF: {
my ($type) =
( $bootfile =~ /\.(\w+)$/ ); # what kind of config file (boot, conf, etc.)?
# neither boot nor conf -- start crying and exit.
if ( $type !~ /^(boot|conf)$/ ) {
die "(fatal) $bootfile is neither a boot nor conf file.\n";
}
# Read configuration file into memory.
my ($config);
open( CONF, "<$bootfile" ) || die "(fatal) Can't open $bootfile:$!";
while ( $_ = <CONF> ) { # deal with the includes!
if ( ( /^directory/i && $type eq "boot" )
|| ( /\bdirectory\s+"[^"]+";/ && $type eq "conf" ) )
{
$nameddir = (m/\bdirectory\s+"?([^"\s]+)"?/i)[0];
print "(debug) Named Directory = $nameddir\n" if ($debug);
}
if ( ( /^\s*include\s/i && $type eq "boot" )
|| ( /\binclude\s+"/i && $type eq "conf" ) )
{ # include statement!
my (@conf) = ($_);
# (boot) ^include <file>
# (conf) ^include "<file>";
for ( my ($i) = 0 ; $i <= $#conf ; $i++ ) {
next
unless ( $conf[$i] =~ /\binclude\s/i ); # skip non includes ...
chomp $conf[$i];
print "(debug) Include statement ($conf[$i]) found.\n"
if ($debug);
my ($file) = ( $conf[$i] =~ m/\binclude\s+"?([^"\s]+)"?/i );
$file =~ s/\s+//; # files shouldn't have whitespace ...
unless ( $file =~ m!^/! ) { # relative
unless ($nameddir) { # include before directory? boo!
$nameddir = ".";
warn
qq{(warn) Include found before named directory was specified! Using ".".\n};
}
$file = "$nameddir/$file";
}
$file = &Handle_Path( $rootdir, $file );
print "(debug) Including file $file.\n" if ($debug);
open( IN, "<$file" ) || die "(fatal) Can't open $file:$!";
if ( $type eq "boot" ) {
splice @conf, $i--, 1,
<IN>; # replace include with data then recheck index
}
elsif ( $type eq "conf" ) {
$conf[$i] =~ /^(.*)\binclude\s+"?[^"\s]+"?\;(.*)$/i;
splice @conf, $i--, 1, $1, <IN>, $2;
}
close(IN);
}
$config .= join ( "", @conf ); # tack in included stuff ...
next;
}
$config .= $_; # append single line!
}
close(CONF);
print "(debug) Read in $bootfile.\n" if ($debug);
# no directory statement anywhere?
die "(fatal) No named directory specified!\n" unless ($nameddir);
if ( $type eq "boot" ) { # parse named.boot
# deal with directives
foreach ( grep( /^;\s*mkrdns\s+/, split ( /\n/, $config ) ) ) {
s/^;\s*mkrdns\s+//;
&Directives($_);
}
foreach $i ( split ( /\n/, $config ) ) {
$i =~ s/;.*$//; # remove comments
$i =~ s/^\s+//; # remove whitespace
$i =~ s/\s+$//;
if ( $i =~ /^(primary|secondary)/i ) { # primary/secondary domain ...
my ( $type, $domain, $tmp, $file ) =
( $i =~ /^(\S+)\s+(\S+)\s+(\S+\s+)?(\S+)\s*$/ );
&Handle_Domain( 'default', $type, $domain, $file, \%files );
}
}
}
elsif ( $type eq "conf" ) { # parse named.conf
my ($directives) = ( $config =~ m!^/\*\s*mkrdns(.+?)\*/!msi );
if ($directives) { # mkrdns directive
foreach $i ( split ( /\n/, $directives ) ) {
$i =~ s/\#.+$//;
$i =~ s/^\s+//;
$i =~ s/\s+$//;
next unless $i =~ /\S/;
&Directives($i);
}
}
# Remove comments from config!
$config =~ s!/\*.*?\*/!!gs; # /* ... */
$config =~ s!//.*?\n!\n!gs; # // ...
$config =~ s!\#.*?\n!\n!gs; # # ...
# determine which domains and networks we are master for.
# Set the defaults
my $count = 0;
my $view = "default";
my $views = undef;
my $zone = undef;
my $type = undef;
my $file = undef;
# some people have whitespace between } and ;, so fix it...
$config =~ s/}\s+;/};/g;
# The controls { inet ... }; thing is the only one that
# doesn't have a }; at the end of one of the sections.
# That's very annoying, so we get rid of it all since we don't
# need it anyway. The inet command is supposedly the only
# thing valid in the controls section, but there can multiple
# inet entries, so we remove them all.
$config =~ s/\bcontrols\s*{(?:\s*inet\b.+?};)+\s*};//s;
# Make sure that the { and }; are properly on their own.
$config =~ s/};/\n};/g;
$config =~ s/{/{\n/g;
# Each config line should be by itself for easier parsing
$config =~ s/\;/\;\n/g;
# Go through the input file!
foreach ( split ( /\n/, $config ) ) {
if (/\bview\s+"([^"]+)"/i) { # If we see a view statement ...
$view = $1; # set the view
# Now figure out if the statement is valid or not.
if ( defined $views && $views == 0 ) {
# A view was defined after a non-viewed zone ...
die "Can't have non-zoned and zoned views!\n";
}
if ( $count > 0 ) {
# A view must not be enclosed in bracies.
die "Views must be defined at the top level (view $view).\n";
}
# We know that we're validly views now.
$views = 1 unless defined $views;
}
elsif (/\bzone\s+"([^"]+)"/i) { # Now we see a zone statement ...
$zone = lc $1; # set the zone
# Now figure out if the statement is valid or not.
if ( defined $views && $views == 1 && $count < 1 ) {
# A zone must either be in a view or at the top level
die "Can't have non-zoned and zoned views!\n";
}
if ( $count > 1 ) {
die "Zones are not embedable (zone $zone is in another zone)!\n";
}
# If we're a zone and not in a view ...
# $views == $count so that we can verify the level we should
# be at for config options.
$views = $count unless defined $views;
}
# Re-calculate our config level
$count += /{/g;
$count -= /};/g;
# If there's a configuration file error and too many }; are found ...
die "Too many }; found!\n" if ( $count < 0 );
# Reset things if we've closed all our config levels out ...
$view = "default" if ( $count < 1 );
if ( !defined $views || $count <= $views ) {
if ( defined $zone && defined $type && !defined $file ) {
warn qq{(warn) No file specified for zone "$zone" in "$bootfile".\n};
}
$zone = undef;
$type = undef;
$file = undef;
}
next unless ( defined $zone ); # we need to be in a zone
next if ( $count != $views + 1 ); # we need to be at the right level
next unless /\b(type|file)\b/i; # only use type and file
if (/\btype\s+(master|slave)\b/i) {
$type = lc $1;
}
if (/\bfile\s+"([^"]+)"/i) {
$file = $1;
}
next unless ( defined $type && defined $file );
Handle_Domain( $view, $type, $zone, $file, \%files );
}
}
}
# Take the array of regexps to skip and put them in a single var
$toskip = @toskip ? join ( "|", @toskip ) : undef;
# Read in current reverse maps, report errors. Remember non-PTR lines
# for creation later on.
REVERSE: {
while ( my ( $view, $nets ) = each %networks ) {
while ( my ( $net, $file ) = each %{$nets} ) {
open( IN, "<$file" )
|| die qq{(fatal) Can't open "$file" for reading:$!};
seek( IN, 0, 0 );
{
local $/ = undef; # slurp mode
$hash{$file} = Do_Hash(<IN>); # get the hash value for the original file
}
print "(debug) Generated hash value for $file: $hash{$file}.\n"
if ($debug);
print "(debug) Scanning $file for non-PTR lines:\n" if ($debug);
seek( IN, 0, 0 );
# strip out PTR, $GENERATE, $ORIGIN, and $INCLUDE ...
$maps{$view}->{$net} =
join ( "", grep( !/(\s+PTR\s+|^\$(ORIGIN|INCLUDE|GENERATE))/i, <IN> ) );
close(IN);
# Pick out the serial number ( required to be the first RR,
# so the regexp is not too complex. )
( $i = $maps{$view}->{$net} ) =~ s/\s*;.+?\n//g; # remove comments
( $serial{$file} ) = ( $i =~ m!\s+SOA\s+\S+\s+\S+\s+(?:\(\s*)?(\d+)!is );
if ($debug) { # print out non-PTR records (long...?)
foreach $i (
split ( /\n/, $maps{$view}->{$net} ),
"Parsed serial number: $serial{$file}"
)
{
print "(debug) $i\n";
}
}
}
}
}
# Read in current forward maps, convert A records into PTR records,
# add to map. If there are multiple A records for a given IP, report
# duplicate, and keep first.
#
# This routine is the biggest time suck...
#
READIN: {
foreach (@domains) {
my ( $view, $domain, $map ) =
split ( /:/, $_ ); # $view = view, $domain = domain, $map = map file
my ($last) = "$domain."; # what to use in case of blank hostname
# hostname, $ORIGIN, domain in that order
my ($end) = $last; # what to use in case of relative hostname
# $ORIGIN then domain, in that order
print
"(debug) Reading in entries from $map for domain $domain, view $view.\n"
if ($debug);
my (@data);
open( IN, "<$map" ) || die "(fatal) Can't open $map:$!";
chomp( @data = <IN> ); # slurp in map file w/out ending \n's
close(IN);
# deal with $INCLUDE and $GENERATE statements ...
print "(debug) Scanning for \$INCLUDE and \$GENERATE statements...\n"
if ($debug);
for ( $i = 0 ; $i <= $#data ; $i++ ) {
next
unless ( $data[$i] =~ /^\$(INCLUDE|GENERATE)/ )
; # skip non-include/generate lines
$data[$i] =~ s/;.*$//; # remove comments & whitespace
$data[$i] =~ s/\s+$//;
if ( $data[$i] =~ /^\$GENERATE/ ) {
print qq{(debug) "$data[$i]" specified.\n} if ($debug);
# Set ORIGIN to blank -- we'll handle it later.
splice @data, $i, 1, &Handle_GENERATE( "", $data[$i] );
}
elsif ( $data[$i] =~ /^\$INCLUDE/ ) {
# $INCLUDE <file> <origin>
my ( $inc, $file, $origin ) = split ( /\s+/, $data[$i] );
print qq{(debug) "$data[$i]" specified.\n} if ($debug);
$file = "$nameddir/$file" unless ( $file =~ m!^/! );
$file = &Handle_Path( $rootdir, $file );
my (@inc);
open( IN, "<$file" )
|| die qq{(fatal) Can't read \$INCLUDE file "$file":$!};
chomp( @inc = <IN> );
close(IN);
if ($origin) { # specified origin applies only to specified
# include file. put appropriate sections at end
# of zone file. see BIND 3rd ed. p.146
# put $ORIGIN and included file at the end of the config
push ( @data, "\$ORIGIN $origin", @inc );
splice @data, $i, 1; # remove $INCLUDE line
}
else { # just replace the $INCLUDE line with the contents of file
splice @data, $i, 1, @inc;
}
$i--; # rescan the line where the $INCLUDE was.
}
}
# the file should be fully expanded in memory now.
# go through all 'host ? ? ?' and $ORIGIN lines ...
foreach $i ( grep( /^(\S*(\s+\d+)?(\s+\w+)?\s+\S+\s+|\$ORIGIN)/i, @data ) )
{
$i =~ s/\s*;.*$//; # strip comments ...
next unless ( length $i ); # skip blanks
if ( $i =~ /^\$ORIGIN/i ) { # $ORIGIN!
$end = ( split ( /\s+/, $i ) )[1];
$end .= ".$domain." if ( $end !~ /\.$/ ); # not FQDN
$last = lc $end;
print qq{(debug) "$i" specified. Final = "$last".\n}
if ($debug);
next;
}
# parse the line
# HOST TTL CLASS TYPE VALUE
# TTL can be a number (seconds), or string
# (1w1d1h1m1s), max of 63 chars. lib/dns/ttl.c,
# function bind_ttl, BIND9.1.3.
# According to RFC1035, class and ttl can be
# reversed. <grrr>
#
my ( $host, $type, $ip ) =
( $i =~
m!^(\S*)(?:\s+(?:\d+|(?:\d+[wdhms])+|IN|CS|CH|HS)){0,2}\s+(\w+)\s+(\S+)!i
);
$host = lc $host; # lowercase the host
$type = uc $type; # make sure the type (A,MX,etc) is uppercase
next unless ($type); # in SOA " 30 ; comment" ...
$host = $end if ( $host eq "@" ); # @ = ORIGIN
# what to do with host? interact with last if necessary ...
if ( $host eq "" ) { # it's a blank, use the last entry ...
$host = $last;
}
elsif ( $host !~ /\.$/ ) { # relative hostname
$last = $host = "$host.$end";
}
else { # FQDN!
$last = $host;
}
# This needs to stay here for proper " A 10.0.0.0"
# behavior -- DON'T MOVE ME (again) BAD BAD THEO!
next unless ( $type eq "A" ); # skip non-A records
# should we skip?
if ( defined $toskip
&& ( $host =~ /$toskip/o || $ip =~ /$toskip/o ) )
{
print "(debug) Skipping $host/$ip, matched toskip regexp ($toskip).\n"
if ($debug);
next;
}
# do network mapping
if ( keys %netmap ) {
my ($ipm) = &GenMask($ip);
foreach $i ( keys %netmap ) {
my ( $newnet, $netm, $mask ) = @{ $netmap{$i} };
unless ( ( $ipm ^ $netm ) & $mask ) { # 0 if in match made
my ($ptr) = ( $ip =~ /\.(\d+)$/ );
print "(debug) $ip mapping to $newnet.$ptr ...\n"
if ($debug);
$ip = "$newnet.$ptr";
last; # IPs should only match once ...
}
}
}
# figure out which network this IP is in ...
my ($network) = &IPinNetwork( $ip, $view, \%networks );
unless ( defined $network ) {
print "(debug) Not keeping $host = $ip, not in any network.\n"
if ($debug);
next;
}
# the original may or may not be all numeric (maps)
my ( $orig, $ptr ) = ( $ip =~ /^(.+)\.(\d+)$/ );
if ( exists( $mips{$view}->{$network}->{$orig}->{$ptr} ) )
{ # IP already has mapping!
print qq{The entry in "$map" for "$host" duplicated "},
$mips{$view}->{$network}->{$orig}->{$ptr},
qq{".\nKeeping the original entry.\n}
unless ($quiet);
print
"(debug) Not keeping $host = $ip, a PTR has already been defined ("
. $mips{$view}->{$network}->{$orig}->{$ptr} . ").\n"
if ($debug);
next;
}
print "(debug) Keeping $host = $ip, in network $network, view $view.\n"
if ($debug);
# Network/origin/ptr = host
$mips{$view}->{$network}->{$orig}->{$ptr} = $host;
}
}
}
# Check each output zone file to see if it needs changing
HASH: {
while ( my ( $view, $nets ) = each %networks ) {
print "(debug) Checking view $view for file changes ...\n" if ($debug);
while ( my ( $net, $file ) = each %{$nets} ) {
my ( $orig, $ptr );
my ($map) = $maps{$view}->{$net};
%{ $mips{$view}->{$net} } = ()
unless ( defined $mips{$view}->{$net} ); # no IPs in net!
# Stole this from http://www.sysarch.com/perl/sort_paper.html ;)
foreach $orig (
sort {
pack( 'C*' => split ( /\./, $a ) ) cmp
pack( 'C*' => split ( /\./, $b ) )
} keys %{ $mips{$view}->{$net} }
)
{
$map .= "\$ORIGIN "
. join ( ".", reverse( split ( /\./, $orig ) ) )
. ".in-addr.arpa.\n"; # append $ORIGIN to map
my $ptrs = $mips{$view}->{$net}->{$orig};
foreach $ptr ( sort { $a <=> $b } keys %{$ptrs} ) {
# Add PTR line to map
$map .= "$ptr\tPTR\t" . $ptrs->{$ptr} . "\n";
}
}
my ($hv) = Do_Hash($map); # generate hash value for new map
print
"(debug) Generated hash values for $file (old/new): $hash{$file}/$hv.\n"
if ($debug);
if ( $hv ne $hash{$file} ) { # maps are different!
print "(debug) File $file needs to be updated.\n" if ($debug);
my ($fserial);
my ($use) = $numordate{ $files{$file} }
|| $numordate{"default"}
|| "date";
print "(debug) File $file uses serial type $use.\n" if ($debug);
if ( $use eq "date" ) {
$fserial = &strftime( "%Y%m%d00", localtime(time) );
# if fserial > serial, then use fserial directly ...
if ( $fserial <= $serial{$file} )
{ # serial is >= fserial, add 1 to serial and use it if possible
if ( $serial{$file} =~ /99$/ ) { # version 99! can't roll.
die
qq#(fatal) Serial number $serial{$file} (file "$file") ends in 99 -- can't add 1! Freaky!\n#;
}
$fserial = $serial{$file} + 1;
}
}
elsif ( $use eq "number" ) {
$fserial = $serial{$file} + 1;
}
else {
die qq{(fatal) Unknown serial type "$use".};
}
warn "(warn) Serial number for $file is at max.\n"
if ( $fserial > 4294967294 );
print "(debug) Changing serial number for $file from",
" $serial{$file} to $fserial\n"
if ($debug);
$map =~ s/(\s+SOA\s+\S+\s+\S+\s+(?:\(\s*)?)$serial{$file}/$1$fserial/s;
$file .= ".$ext" if ($ext); # file or file.ext?
print qq{Updating file "$file"\n} unless ($quiet);
open( OUT, ">$file" )
|| die "(fatal) Can't open $file for writing:$!";
print OUT $map;
close(OUT);
}
else {
print "File $file needs no modification.\n" unless ($quiet);
}
}
}
}
exit 0;
# Is the given IP address in any of the specified networks?
# note: this routine only checks on byte boundaries
# Return undef if not, network number if yes.
#
{
my %cache = ();
sub IPinNetwork {
my ( $ip, $view, $networks ) = @_; # IP to check, hash of networks to check
my ($orig) = ( $ip =~ /^(.+)\.\d+$/ );
return $cache{$view}->{$orig} if exists $cache{$view}->{$orig};
do { # matches most specific network first (10.0.49 before 10 ...)
$ip =~ s/\.[^\.]+$//; # remove last octet (host #)
if ( exists $networks->{$view}->{$ip} ) {
$cache{$view}->{$orig} = $ip;
return $ip;
}
} while ( $ip =~ /\./ ); # while there's a period in the IP
return undef;
}
}
# Generate a bitmask from an IP/Network/bit count.
# Returns array of bitmasks from array of input values.
#
sub GenMask {
if ( $_[0] =~ /^\d+$/ ) { # /27 ...
return ~( 2**( 32 - $_[0] ) - 1 );
}
else { # 255.255.255.224 ...
return unpack( "N", pack( 'C4' => split ( /\./, $_[0] ) ) );
}
}
# Parse the directive statements and plop the info in the right place.
#
sub Directives {
my ( $type, $vals ) = split ( /\s+/, $_[0], 2 );
print qq{(debug) mkrdns directive, type "$type", vals "$vals"\n}
if ($debug);
$type = lc $type;
if ( $type eq "map" ) {
my ( $nm, $nn ) = split ( /\s+/, $vals );
@{ $netmap{$nm} } = ( $nn, map { &GenMask($_) } split ( /\//, $nm ) );
}
elsif ( $type eq "skip" ) {
push ( @toskip, $vals );
}
elsif ( $type eq "skipzone" ) {
map {
my ( $v, $d ) = split ( /:/, $_, 2 );
( $v, $d ) = ( "default", $v ) if ( !defined $d );
$zonetoskip{ lc $v }->{ lc $d } = 1;
} split ( /\s+/, $vals );
}
elsif ( $type eq "serialt" ) {
# $vals = "default|zone number|date"
$vals = lc $vals;
my ( $view, $zone, $nord ) = split ( /\s+/, $vals, 3 );
( $view, $zone, $nord ) = ( 'default', $view, $zone )
if ( !defined $nord ); # backwards compatibility
die qq{(fatal) mkrdns directive "$type $vals" invalid.}
if ( $nord !~ /^(number|date)$/ );
$numordate{"$view:$zone"} = $nord;
}
elsif ( $type eq "ignoreslaves" ) {
$ignoreslaves = 1;
}
else {
die qq{(fatal) mkrdns directive type "$type" is unknown.};
}
}
# Generate actual lines from $GENERATE statements
# This routine should actually handle all $GENERATE types, although we're
# only going to use it for A records in mkrdns ...
#
sub Handle_GENERATE {
my ( $ORIGIN, $GENERATE ) = @_;
my (@toreturn) = ();
# $RANGE is 'start-stop[/step]', all must be positive
# $LHS/$RHS:
# $ is replaced by iterator value.
# \$ is a $ at the end.
# $\{ is replaced by the iterator value and the actual { char.
# Append $ORIGIN if $RHS!~/\.$/
# ${offset} where offset defaults to "0,1,d".
# offset (integer),min width (0 padded),radix (doxX)
# $TYPE is A|AAAA|PTR|CNAME|NS
my ( $RANGE, $LHS, $TYPE, $RHS ) = ( split ( /\s+/, $GENERATE ) )[ 1 .. 4 ];
die qq{(fatal) Invalid \$GENERATE line: "$GENERATE"\n}
unless ( defined($RANGE)
&& defined($LHS)
&& defined($TYPE)
&& defined($RHS) );
$TYPE = uc $TYPE;
die qq{(fatal) Invalid \$GENERATE line (bad type): "$GENERATE"\n}
unless ( $TYPE =~ /^(A|AAAA|PTR|CNAME|NS)$/ );
my ( $START, $STOP, $SKIP ) = ( $RANGE =~ m{^(\d+)-(\d+)(?:/(\d+))?$} );
if ( !defined($SKIP) || ( defined($SKIP) && $SKIP < 1 ) ) {
warn qq{(warn) Invalid \$GENERATE line (bad skip): "$GENERATE" (set to 1)\n}
if ( defined $SKIP );
$SKIP = 1; # skip defaults to 1 if not specified.
}
die qq{(fatal) Invalid \$GENERATE line (non-pos value): "$GENERATE"\n}
unless ( $START > 0 && $STOP > 0 );
# Convert trouble-some combinations out of the way.
foreach ( $LHS, $RHS ) {
s/\$\\\{/\$\377/g; # $\{ -> $\377
# Literal $'s in the statement
s/\\\$/\376/g; # \$ -> \376
s/\$\$/\376/g; # $$ -> \376
# Replace $ or ${...} w/ valid ${offset,width,radix} sections.
s@\$(?:{([^}]+)})?@
my($o,$w,$r) = split(/,/,(defined $1?$1:""));
# Want to set to the default if not defined or invalid,
# only want to warn if invalid.
if ( !defined($o) || $o!~/^-?\d+$/ ) {
warn qq{(warn) Invalid \$GENERATE line (bad offset): "$GENERATE" (set to 0)\n}
if ( defined($o) );
$o = 0;
}
if ( !defined($w) || $w<1 ) {
warn qq{(warn) Invalid \$GENERATE line (bad width): "$GENERATE" (set to 1)\n}
if ( defined($w) );
$w = 1;
}
if ( !defined($r) || $r !~ /^[doxX]$/ ) {
warn qq{(warn) Invalid \$GENERATE line (bad radix): "$GENERATE" (set to d)\n}
if ( defined($r) );
$r = "d";
}
"\${$o,$w,$r}";
@ge;
}
for ( my ($IT) = $START ; $IT <= $STOP ; $IT += $SKIP ) {
$_ = "$LHS $RHS";
# The only $'s left in the string should be iterator values.
s@\${([^}]+)}@
my($o,$w,$r) = split(/,/,$1);
sprintf "%0$w$r", $IT+$o;
@ge;
tr/\377\376/{$/; # Put the chars back in as literals.
my ( $l, $r ) = split;
if ( $ORIGIN ne "" ) {
# The right side of an A or AAAA record is an address...
foreach ( ( $TYPE =~ /^A/ ) ? $l : ( $l, $r ) ) {
$_ .= ".$ORIGIN" unless (/\.$/);
}
}
push ( @toreturn, "$l $TYPE $r" );
}
return @toreturn;
}
# This section of code takes in a line from the named configuration file and
# puts the info in the appropriate spots. This used to be in both the
# named.conf and named.boot handlers in the main set of code, but the code
# was exactly the same, so I put it here for maintainability.
#
sub Handle_Domain {
my ( $view, $type, $domain, $file, $files ) = @_;
$domain = lc $domain;
if ( $zonetoskip{$view}->{$domain} ) {
print "(debug) Skipping view $view, zone $domain, matched skipzone.\n"
if ($debug);
return;
}
unless ( $domain && $file ) {
warn
qq{(warn) No file specified for view "$view", zone "$domain" in "$bootfile".\n};
return;
}
if ( $type =~ /^(slave|secondary)$/i && defined($ignoreslaves) ) {
print "(debug) Skipping slave $view:$domain\n" if ($debug);
return;
}
$file = "$nameddir/$file" if ( $file !~ m!^/! );
$file = &Handle_Path( $rootdir, $file );
if ( $domain =~ /\.arpa$/i ) { # network
# The file is already being used!
die
qq#(fatal) The zone file "$file" is being used by two zones! Error in config file!\n($files->{$file} and $view:$domain ...)\n#
if ( exists $files->{$file} );
$files->{$file} = "$view:$domain";
if ( $type =~ /^(secondary|slave)$/i ) {
print "(debug) Skipping slave reverse zone $view:$domain\n"
if ($debug);
return;
}
$domain =~ s/\.in-addr\.arpa$//i; # just the net ...
if ( $domain =~ /127$/ ) { # silently skip 127.*
print "(debug) Skipping $file for the 127.* network.\n"
if ($debug);
return;
}
$domain = join ( ".", reverse( split ( /\./, $domain ) ) );
$networks{$view}->{$domain} = $file;
print
qq{(debug) Network "$domain", View "$view", File "$file", Type "$type".\n}
if ($debug);
}
else { # "normal" domain, read in domains in order presented.
push ( @domains, "$view:$domain:$file" );
print
qq{(debug) Domain "$domain", View "$view", File "$file", Type "$type".\n}
if ($debug);
}
}
# Trim down a path to a standardized form.
# ie: /path/../foo -> /foo
#
sub FixPath {
$_ = $_[0];
tr#/#/#s; # Remove multiple /'s
s#/\./#/#g; # /./ -> /
s#/\.$##; # remove /.$
s#(^|/)[^/]*/\.\./#/#g; # /[^/]/../ -> /
s#(^|/)[^/]*/\.\.$##g; # remove /..$
s#^\./##; # remove ^./
return $_;
}
# Take a given path, handle a possibly different root directory, then return
# it.
#
sub Handle_Path {
my ( $rootdir, $orig ) = @_;
my ($new) = &FixPath($orig);
if ( $new =~ m#^/?\.\.(/|$)# ) {
warn
qq{(warn) Path "$_" tries to go beyond root directory ("$new"). Removing.\n}
unless ($quiet);
$new =~ s#^/?\.\.(/|$)##;
}
$new = &FixPath("$rootdir/$new");
if ( $orig ne $new ) {
print qq{(debug) Path changed from "$orig" to "$new".\n} if ($debug);
$orig = $new;
}
return $orig;
}
sub Do_Hash {
# Built-in (32bit checksum)
return unpack( "%32C*", $_[0] ) % 65535; # generate 32-bit checksum for text
}
__END__
=head1 NAME
mkrdns - MaKe Reverse DNS (auto generate PTR maps)
=head1 SYNOPSIS
mkrdns [options] [configuration file]
=head1 DESCRIPTION
mkrdns is a program designed to auto-generate reverse DNS maps (IN PTR
records). Some programs already accompany the BIND source package