(Optionally) check zones with nsd before they are written, to ensure safety

bin/writezone.pl

@@ -10,6 +10,7 @@ use feature 'say';
 use FindBin qw($Bin);
 use YAML::Tiny;
 use DBI;
+use Capture::Tiny ':all';
 
 my $yml = YAML::Tiny->read("$Bin/../config.yml");
 my $tld = $yml->[0]->{"tld"};
@@ -25,30 +26,27 @@ $sth->execute;
 my $cyberman = $sth->fetchrow_hashref;
 exit unless $cyberman->{"intserial"} > $cyberman->{"lastserial"};
 
-open my $out, ">", $conf->{"file"} or die $!;
+my $zone;
 
 # Introduction
-say $out <<'END';
+$zone .= <<"END";
 ; File produced by cyberman. Do not edit!
-$TTL 86400
-$ORIGIN cyb.
+\$TTL 86400
+\$ORIGIN $tld.
+
 END
 
 # Write SOA
 # Uses mostly hard-coded values for now
-say $out "@  1D  IN  SOA $conf->{ns} $conf->{responsible} (";
-say $out time;
-say $out <<'END';
+$zone .= "@  1D  IN  SOA $conf->{ns} $conf->{responsible} (\n" . time . "\n";
+$zone .= <<'END';
 1800 ; refresh
 15 ; retry
 604800 ; expire
 1h ; nxdomain ttl
 )
-END
 
-if ($conf->{"include"}->{"enabled"}) {
-	say $out "\$INCLUDE $conf->{include}->{file}";
-}
+END
 
 # Time to get the records
 $sth = $dbh->prepare("SELECT * FROM record");
@@ -63,20 +61,41 @@ while (my $r = $sth->fetchrow_hashref) {
 
 	# domain name
 	if ($r->{"name"} eq '@') {
-		print $out $d->{"name"}, " ";
+		$zone .= $d->{"name"} . " ";
 	} else {
-		print $out $r->{"name"}, ".", $d->{"name"}, " ";
+		$zone .= $r->{"name"} . "." . $d->{"name"} . " ";
 	}
 
 	# record type
-	print $out "IN $r->{type} ";
+	$zone .= "IN $r->{type} ";
 
 	# value
-	say $out $r->{value};
+	$zone .= "$r->{value}\n";
 }
 
+if ($conf->{"validate"}) {
+	my $checkzone_exit;
+	capture {
+		open my $checkzone, "| nsd-checkzone $tld -" or die $!;
+		print $checkzone $zone;
+		close $checkzone;
+		$checkzone_exit = $?;
+	};
+	if ($checkzone_exit != 0) {
+		$sth = $dbh->prepare("UPDATE cyberman SET zonecheckstatus=1");
+		$sth->execute;
+		exit;
+	}
+}
+
+if ($conf->{"include"}->{"enabled"}) {
+	$zone .= "\$INCLUDE $conf->{include}->{file}\n";
+}
+
+open my $out, ">", $conf->{"file"} or die $!;
+say $out $zone;
 close $out;
 
-$sth = $dbh->prepare("UPDATE cyberman SET lastserial=?");
+$sth = $dbh->prepare("UPDATE cyberman SET lastserial=?, zonecheckstatus=0");
 $sth->bind_param(1, $cyberman->{"intserial"});
 $sth->execute;

config.yml

@@ -42,6 +42,9 @@ zonewriter:
     # in the zone, which allows you to define some records manually
     enabled: 1
     file: 'human_cyb'
+  # if true, written zones will be checked with nsd-checkzone, just in case
+  # requires nsd to be installed and nsd-checkzone to be in path
+  validate: 1
 
 mail:
   enabled: 1

cpanfile

@@ -14,6 +14,7 @@ requires "Email::Simple" => "0";
 requires "Email::Simple::Creator" => "0";
 requires "Email::Sender::Simple" => "0";
 requires "URI::Escape" => "0";
+requires "Capture::Tiny" => "0";
 
 requires "Plack::Middleware::Deflater" => "0";
 requires "Plack::Middleware::Session" => "0";

dbupdate/7.sql

@@ -0,0 +1,2 @@
+alter table cyberman add column zonecheckstatus not null default 0;
+update cyberman set dbrev=8;

lib/cyberman.pm

@@ -57,6 +57,17 @@ hook 'before' => sub {
 	var admin => $user->{"admin"};
 	var config => config();
 
+	if ($user->{"admin"}) {
+		my $zone_check = database->quick_lookup(
+			"cyberman",
+			{},
+			"zonecheckstatus",
+		);
+		if ($zone_check != 0) {
+			var zone_check_alert => 1;
+		}
+	}
+
 	if ($user->{"stylesheet"} && grep {$_ eq $user->{"stylesheet"}} @{ config->{"stylesheets"}->{"available"} }) {
 		var stylesheet => $user->{"stylesheet"};
 	} else {

public/css/light.css

@@ -129,3 +129,7 @@ table.t tr:first-child {
 	border-radius: 2px;
 	max-width: 650px;
 }
+.msgBox.warning {
+	background-color: #ff583a;
+	border: 1px solid #c43d25;
+}

schema.sql

@@ -3,9 +3,10 @@ create table cyberman (
 	id integer primary key,
 	dbrev integer not null,
 	intserial integer not null default 1,
-	lastserial integer not null default 0
+	lastserial integer not null default 0,
+	zonecheckstatus integer not null default 0,
 );
-insert into cyberman (dbrev) values (7);
+insert into cyberman (dbrev) values (8);
 
 drop table if exists user;
 create table user (

views/layouts/main.tt

@@ -30,6 +30,16 @@
 				</div>
 			</div>
 			<% END %>
+			<% IF vars.zone_check_alert %>
+			<div class="body">
+				<center>
+					<div class="msgBox warning">
+						<h3>Warning! Achtung!</h3>
+						The zone produced by the zone writer was found to be invalid by nsd; something has gone wrong! Please rectify the problem, and this message will disappear.
+					</div>
+				</center>
+			</div>
+			<% END %>
 			<% content %>
 		</div>
 	</body>