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#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/archive_sync_zones              Copyright 2022 cPanel, L.L.C.
#                                                           All rights reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited

use warnings;
use strict;

require Cpanel::Config::Users;
require Cpanel::Config::LoadCpUserFile;
require Cpanel::Umask;

######[ set defaults based on distro/OS ]##########################################################
my $def_basedir   = '/var/named';
my $def_namedconf = '/etc/named.conf';
my $def_backup    = $def_basedir . '/' . 'zone_sync_backup.tar';

open( my $ndc_fh, '<', $def_namedconf ) or die "Could not open $def_namedconf for reading: $!\n";
my @conf_zones = readline($ndc_fh);
close $ndc_fh;

my %zones;
foreach my $line (@conf_zones) {
    if ( $line =~ m/\s*zone\s+["']([\w\-\.]+)["']/ ) {
        next if $1 eq '.';
        my $zone_name = $1;
        next if $zone_name =~ m/^\./;
        next if $zone_name =~ m/\.arpa$/;
        next if ( exists $zones{$zone_name} );    # Seen in another view
        $zones{$zone_name} = 1;

    }
}

if ( opendir my $zone_dh, $def_basedir ) {
    while ( my $file = readdir $zone_dh ) {
        next if $file !~ m/(.+)\.db$/;            # Only look at cPanel managed zone file
        my $zone_name = $1;
        next if $zone_name =~ m/\.arpa$/;
        next if exists $zones{$zone_name};
        $zones{$zone_name} = 1;
    }
    closedir $zone_dh;
}

my ( $live_domains, $dead_domains ) = get_domains_managed_domains();

if ( -e $def_backup ) {
    require Cpanel::Autodie;
    Cpanel::Autodie::chmod( 0600, $def_backup );
}

my $mask = Cpanel::Umask->new(077);
system "tar -cf $def_backup $def_namedconf";

foreach my $zone ( sort keys %zones ) {
    next if ( !$live_domains->{$zone} && !$dead_domains->{$zone} );
    if ( -e $def_basedir . '/' . $zone . '.db' ) {
        system 'tar', '-r', '-f', $def_backup, $def_basedir . '/' . $zone . '.db';
    }
    else {
        print "Unable to archive zone file for $zone\n";
    }
    system '/usr/local/cpanel/scripts/dnscluster', 'synczone', $zone;
}

print "Archive of pre-sync zones located at: ${def_basedir}/zone_sync_backup.tar\n";

sub get_domains_managed_domains {
    my %live_domains;
    my %dead_domains;
    foreach my $user ( Cpanel::Config::Users::getcpusers() ) {

        # Safe because it's only loading from cpusers list.
        my $cpuser_ref = Cpanel::Config::LoadCpUserFile::loadcpuserfile($user);

        if ( $cpuser_ref->{'DOMAIN'} ) {
            $live_domains{ $cpuser_ref->{'DOMAIN'} } = 1;
        }
        if ( ref $cpuser_ref->{'DOMAINS'} eq 'ARRAY' ) {
            my $_tmp = $cpuser_ref->{'DOMAINS'};
            $live_domains{$_} = 1 for @$_tmp;
        }

        if ( ref $cpuser_ref->{'DEADDOMAINS'} eq 'ARRAY' ) {
            my $_tmp = $cpuser_ref->{'DEADDOMAINS'};
            $dead_domains{$_} = 1 for @$_tmp;
        }
    }
    return ( \%live_domains, \%dead_domains );
}