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

# cpanel - scripts/importmydnsdb                   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 strict;
use Cpanel::DNSLib::MydnsDb              ();
use Cpanel::Validate::Domain::Tiny       ();
use Cpanel::MysqlUtils::Connect          ();
use Cpanel::NameServer::Conf::Mydns      ();
use Cpanel::NameServer::Utils::MyDNS     ();
use Cpanel::PID                          ();
use Cpanel::SafeRun::Errors              ();
use Cpanel::Usage                        ();
use Cpanel::NameServer::Utils::MyDNS::DB ();

use Try::Tiny;

my ( $force, $debug );
Cpanel::Usage::wrap_options( \@ARGV, \&usage, { 'force' => \$force, 'debug' => \$debug } );

if ( $> != 0 ) {
    print STDERR "$0: must run as root\n";
    exit 1;
}

my @messages = ();

my $pid_obj = Cpanel::PID->new( { 'pid_file' => '/var/run/importmydnsdb.pid' } );
unless ( $pid_obj->create_pid_file() > 0 ) {
    push @messages, "Importmydnsdb appears to be running already.";
    push @messages, "Please wait for the import to finish before attempting another.";
    send_notification(
        {
            action => "already_running",
            result => "failure"
        }
    );
    exit 1;
}

# perform a sanitfy check and try to repair if possible
my ( $mydns_is_sanitize, $message ) = Cpanel::NameServer::Utils::MyDNS::DB::sanity_check();
unless ($mydns_is_sanitize) {
    push @messages, "Errors have been detected with the MyDNS configuration, trying to repair";
    Cpanel::SafeRun::Errors::saferunallerrors('/usr/local/cpanel/bin/build_mydns_conf');
    ( $mydns_is_sanitize, $message ) = Cpanel::NameServer::Utils::MyDNS::DB::sanity_check();
    unless ($mydns_is_sanitize) {
        push @messages, "Cannot repair your MyDNS configuration, please reinstall it";
        send_notification(
            {
                action => "cannot_repair",
                result => "failure"
            }
        );
        exit 1;
    }
    push @messages, "MyDNS configuration repaired successfully";
}

my $namedconf_obj = Cpanel::NameServer::Conf::Mydns->new();
$namedconf_obj->initialize();
$namedconf_obj->check_zonedir_cache();
my $bind_dir = $namedconf_obj->{'config'}->{'zonedir'};

my $dbh;
try {
    $dbh = Cpanel::MysqlUtils::Connect::get_dbi_handle( 'extra_args' => { 'PrintError' => 0 } );
}
catch {
    send_notification(
        {
            action                => "cannot_connect_to_database",
            result                => "failure",
            additional_parameters => {
                error_details => $_,
            }
        }
    );
    exit 1;
};

my $settings_ref = $namedconf_obj->{'dns_settings'};
my $soa_table    = $settings_ref->{'database'} . '.' . $settings_ref->{'soa-table'};
my $dns_db       = $namedconf_obj->{'dns_db'};

my $get_zones_query = qq {
    SELECT origin FROM $soa_table
    };

my $sth = $dbh->prepare($get_zones_query);
unless ($sth) {
    send_notification(
        {
            action                => "cannot_get_zones",
            result                => "failure",
            additional_parameters => { error_details => $dbh->errstr }
        }
    );
    exit 1;
}
unless ( eval { $sth->execute() } ) {
    send_notification(
        {
            action                => "cannot_get_zones",
            result                => "failure",
            additional_parameters => { error_details => $dbh->errstr }
        }
    );
    exit 1;
}

my %existing_zones = ();
while ( my $data = $sth->fetchrow_hashref() ) {
    $data->{'origin'} =~ s/\.$//;
    $existing_zones{ $data->{'origin'} } = 1;
}
$sth->finish;

my $zone_dh;
unless ( opendir $zone_dh, $bind_dir ) {
    send_notification(
        {
            action                => "cannot_read_zone_file",
            result                => "failure",
            additional_parameters => {
                zone_file_dir => $bind_dir,
                error_details => scalar $!
            }
        }
    );
    exit 1;
}
my @zonedir_contents = readdir($zone_dh);
closedir $zone_dh;

my $sth_put_soa = $dbh->prepare( $dns_db->{put_soa_query} );
unless ($sth_put_soa) {
    send_notification(
        {
            action                => "database_error",
            result                => "failure",
            additional_parameters => {
                error_details => $dbh->errstr,
            }
        }
    );
    exit 1;
}

my $sth_get_soa = $dbh->prepare( $dns_db->{get_soa_id} );
unless ($sth_get_soa) {
    send_notification(
        {
            action                => "database_error",
            result                => "failure",
            additional_parameters => {
                error_details => $dbh->errstr,
            }
        }
    );
    exit 1;
}

my $sth_put_rr = $dbh->prepare( $dns_db->{put_rr_query} );
unless ($sth_put_rr) {
    send_notification(
        {
            action                => "database_error",
            result                => "failure",
            additional_parameters => {
                error_details => $dbh->errstr,
            }
        }
    );
    exit 1;
}

if ($force) {
    unless ( $dns_db->purge_rss() ) {
        send_notification(
            {
                action => "cannot_purge_rss",
                result => "failure"
            }
        );
        exit 1;
    }
}

my %needed_zone_files = ();
push @messages, "Checking zones in MyDNS database";
foreach my $zonefile (@zonedir_contents) {
    if ( $zonefile =~ /^([\w\-.]+)\.db$/ && Cpanel::Validate::Domain::Tiny::validdomainname($1) ) {
        my $zone = $1;
        if ( $force || !$existing_zones{$zone} ) {
            $needed_zone_files{$zonefile} = $zone;
            next;
        }
        if ($debug) {
            push @messages, "$zone already exists in MyDNS, not imported";
        }
    }
}
push @messages, "Done";

push @messages, "Importing zones into MyDNS database";
my $counter = 0;
foreach my $zonefile ( keys %needed_zone_files ) {
    my ( $zone_fh, $zonedata );

    unless ( open $zone_fh, '<', $bind_dir . '/' . $zonefile ) {
        push @messages, "Unable to read $bind_dir" . '/' . $zonefile;
        next;
    }

    {
        local $/;
        $zonedata = readline($zone_fh);
    }
    close $zone_fh;

    my ( $soa_hr, $rr_ar ) = Cpanel::NameServer::Utils::MyDNS::parsebind( $zonedata, $needed_zone_files{$zonefile} );
    unless ( scalar keys(%$soa_hr) ) {
        push @messages, "Unable to parse and save $needed_zone_files{$zonefile}\n";
        next;
    }

    my $ns     = ( $soa_hr->{ns} =~ m/\.$/ )     ? $soa_hr->{ns}     : $soa_hr->{ns} . '.';
    my $origin = ( $soa_hr->{origin} =~ m/\.$/ ) ? $soa_hr->{origin} : $soa_hr->{origin} . '.';
    my $serial = ( defined $soa_hr->{serial} )   ? $soa_hr->{serial} : Cpanel::DNSLib::MydnsDb::get_new_serial();

    eval {
        unless ( eval { $sth_put_soa->execute( $origin, $ns, $soa_hr->{mbox}, $serial, $soa_hr->{refresh}, $soa_hr->{retry}, $soa_hr->{expire}, $soa_hr->{minimum}, $soa_hr->{ttl}, 'Y' ) } ) {
            push @messages, "Database error, unable to save soa records for $needed_zone_files{$zonefile}";
            next;
        }
        $sth_put_soa->finish();
    };
    if ($@) {
        push @messages, "Database error, saving soa record failed: $@";
        next;
    }

    my $soa_id;
    eval {
        unless ( eval { $sth_get_soa->execute($origin) } ) {
            push @messages, "Database error, unable to get soa id for $needed_zone_files{$zonefile}";
            next;
        }
        my $result = $sth_get_soa->fetchrow_hashref();
        $soa_id = $result->{'id'};
        $sth_get_soa->finish();
    };
    if ($@) {
        push @messages, "Database error, fetching soa record failed: $@";
        next;
    }

    eval {
        foreach my $rr_data ( @{$rr_ar} ) {
            my $aux = ( exists $rr_data->{aux} && $rr_data->{aux} =~ m/^\d+$/ ) ? $rr_data->{aux} : 0;
            unless ( eval { $sth_put_rr->execute( $soa_id, $rr_data->{name}, $rr_data->{type}, $aux, $rr_data->{data}, $rr_data->{ttl}, 'Y' ) } ) {
                push @messages, "Database error, unable to save $rr_data->{name} for $needed_zone_files{$zonefile}";
            }
            $sth_put_rr->finish();
        }
    };
    if ($@) {
        push @messages, "Database error, inserting rr record failed: $@";
    }

    $counter++;
    if ( $counter % 100000 == 0 ) {
        send_notification(
            {
                action                => "zones_imported_successfully",
                result                => "in_progress",
                additional_parameters => { imported_count => $counter }
            }
        );
    }

    if ($debug) {
        push @messages, "$needed_zone_files{$zonefile} is successfully saved";
    }
}

push @messages, "$counter zones have been successfully imported";

unless ($force) {

}

my $mydnschkbin = 0;
if ( -x $namedconf_obj->{'mydnschkbin'} ) {
    push @messages, Cpanel::SafeRun::Errors::saferunallerrors( $namedconf_obj->{'mydnschkbin'}, '--consistency-only' );
    push @messages, 'Zone consistency check is done';
    $mydnschkbin = 1;
}
else {
    push @messages, 'There is no mydnscheck in your system, zone consistency check is skipped';
}

send_notification(
    {
        action                => 'successful_completion',
        result                => 'success',
        additional_parameters => {
            mydnschkbin    => $mydnschkbin,
            force          => $force,
            imported_count => $counter,
            log_           => \@messages,
        }
    }
);

$pid_obj->remove_pid_file();
exit 0;

sub usage {
    print <<EO_USAGE;
Usage: importmydnsdb [options]

    Options:
      --help       Brief help message
      --force      Overwrite existing MyDNS records. This will cause downtime for DNS while records are rebuilt.
      --debug      Prints extra processing information
EO_USAGE
    exit 0;
}

sub send_notification {
    my ($obj) = @_;

    if ( $obj->{'result'} eq 'success' ) {
        my $log_file = join( "\n", @{ $obj->{'additional_parameters'}->{'log_'} } );

        require Cpanel::Notify;
        return Cpanel::Notify::notification_class(
            'class'            => 'ImportMyDNSdb::Success',
            'application'      => 'ImportMyDNSdb::Success',
            'constructor_args' => [
                action       => $obj->{'action'},
                mydnschkbin  => $mydnschkbin,
                attach_files => [ { name => 'import.log.txt', content => \$log_file } ],
                %{ $obj->{'additional_parameters'} },
            ]
        );
    }
    elsif ( $obj->{'result'} eq 'in_progress' ) {
        require Cpanel::Notify;
        return Cpanel::Notify::notification_class(
            'class'            => 'ImportMyDNSdb::InProgress',
            'application'      => 'ImportMyDNSdb::InProgress',
            'constructor_args' => [
                action => $obj->{'action'},
                %{ $obj->{'additional_parameters'} },
            ]
        );
    }
    else {
        require Cpanel::Notify;
        return Cpanel::Notify::notification_class(
            'class'            => 'ImportMyDNSdb::Failure',
            'application'      => 'ImportMyDNSdb::Failure',
            'constructor_args' => [
                action => $obj->{'action'},
                %{ $obj->{'additional_parameters'} },
            ]
        );
    }
}