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

# cpanel - scripts/setupftpserver                  Copyright 2020 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

package scripts::setupftpserver;

use 5.010;
use strict;
use warnings;
use Getopt::Long 2.45 qw(
  GetOptionsFromArray :config auto_version permute
);
use Readonly;

use Cpanel::Config::LoadCpConf       ();
use Cpanel::Config::CpConfGuard      ();
use Cpanel::Chkservd::Manage         ();
use Cpanel::RPM::Versions::Directory ();
use Cpanel::Services::Enabled        ();
use Cpanel::Services::Restart        ();
use Cpanel::PID                      ();
use Cpanel::Init                     ();
use Cpanel::SafeRun::Simple          ();
use Cpanel::Encoder::Tiny            ();
use IO::Handle                       ();

Readonly my @FTP_SERVERS => qw(pure-ftpd proftpd);

delete @ENV{qw(cp_security_token HTTP_REFERER)};
if ( not caller ) {
    local $| = 1;
    my $script = __PACKAGE__->new(@ARGV);
    exit $script->run();
}

sub new {
    my ( $class, @args ) = @_;

    my %attribute;
    $attribute{'<>'} = sub { $attribute{selected_ftpserver} = shift };

    local @ARGV = @args;
    GetOptions(
        \%attribute,
        qw(current force! html! enable-anonymous! <> help),
    ) or usage(1);
    usage(0) if $attribute{help};
    usage(1)
      if not $attribute{current}
      and not $attribute{selected_ftpserver};

    $attribute{cpconf} = Cpanel::Config::LoadCpConf::loadcpconf();
    return bless \%attribute, $class;
}

sub get_current { return shift->{cpconf}{ftpserver} }

sub run {
    my $self = shift;

    my $current_ftpserver =
      Cpanel::Services::Enabled::is_enabled('ftpd')
      ? $self->get_current
      : 'disabled';

    if ( $self->{current} ) {
        say "Current FTP server type: $current_ftpserver";
        return 0;
    }

    if ( !grep { $self->{selected_ftpserver} eq $_ } ( @FTP_SERVERS, 'disabled' ) ) {
        say "Unknown FTP server specified.\nTry $0 --help";
        return 1;
    }

    if ( !$self->{force} && grep { $self->{selected_ftpserver} eq $_ } @FTP_SERVERS ) {
        my $dir = Cpanel::RPM::Versions::Directory->new(
            { dont_set_legacy => 1 },
        );
        my $target_state = $dir->fetch(
            {
                section => 'target_settings',
                key     => $self->{selected_ftpserver},
            },
        );

        if ( $target_state && grep { $target_state eq $_ } qw(unmanaged uninstalled) ) {
            my %target_state_msg = (
                unmanaged   => 'flagged to be left alone by cPanel',
                uninstalled => 'explicitly blocked from installation',
            );
            print <<"END_TARGET_STATE_MESSAGE";
WARNING: You are attempting to switch to $self->{selected_ftpserver}, but it has explicitly been set to $target_state in /var/cpanel/rpm.versions.d/
This means its RPMS have been $target_state_msg{$target_state}. If this was unintentional, you may be able to remove
this flag by running the following command and then re-running $0

    /usr/local/cpanel/scripts/update_local_rpm_versions --del target_settings.$self->{selected_ftpserver}

If you meant to do this, please re-run $0 with --force

END_TARGET_STATE_MESSAGE

            return 2;
        }
    }

    die "Conversion process must be performed as root" if $> != 0;

    my $pid_obj = Cpanel::PID->new(
        { pid_file => '/var/run/setupftpserver.pid' },
    );
    if ( $pid_obj->create_pid_file() <= 0 ) {
        print <<END_ALREADY_RUNNING;
$0 appears to be running already.
Please wait for the conversion to finish before attempting another.
END_ALREADY_RUNNING
        return 1;
    }

    # Remove the noanonftp touch file if --enable-anonymous is passed on
    # command line.
    my $no_anon_ftp = '/var/cpanel/noanonftp';
    if ( $self->{'enable-anonymous'} and -e $no_anon_ftp ) {
        say 'Enabling Anonymous FTP';
        unlink $no_anon_ftp;
    }

    elsif ( $current_ftpserver eq 'disabled'
        and $self->{selected_ftpserver} ne 'disabled'
        and not -e $no_anon_ftp ) {

        # Default Anonymous FTP off if moving from disabled.
        say 'Turning Anonymous FTP off';
        open my $fh, '>', $no_anon_ftp
          or die "Couldn't create $no_anon_ftp touch file: $!";
        print {$fh} '';
        close $fh;
    }

    {
        my $cpconf_guard = Cpanel::Config::CpConfGuard->new();
        $self->{cpconf}{ftpserver} = $cpconf_guard->{data}{ftpserver} = $self->{selected_ftpserver};
        $cpconf_guard->save();
    }

    $self->{init} = Cpanel::Init->new();

    #branch to uninstall/install functions
    $self->disable_chksrvd_monitoring();

    if ( grep { $self->{selected_ftpserver} eq $_ } @FTP_SERVERS ) {
        $self->enable_ftpserver(
            $self->{selected_ftpserver},
            $current_ftpserver,
        );
        $self->enable_chksrvd_monitoring();
    }
    else {
        $self->disable_ftpserver($current_ftpserver);
        $self->install_cpanel_rpms();
    }

    $pid_obj->remove_pid_file();

    if ( $self->{'enable-anonymous'} ) {
        say 'Updated FTP Server';
        Cpanel::SafeRun::Simple::saferun('/usr/local/cpanel/scripts/ftpupdate');
    }

    say "\nFTP server conversion complete";
    return 0;
}

sub disable_ftpserver {
    my ( $self, $running_ftpserver ) = @_;

    $self->_touch_disable_file();
    $self->_halt_and_disable_ftp_in_init($running_ftpserver);

    require Cpanel::UIUtils::Update;
    Cpanel::UIUtils::Update::trigger_ui_updates();

    return;
}

sub _touch_disable_file {
    my ($self) = @_;
    system 'touch', '/etc/ftpddisable';
    return;
}

sub _halt_and_disable_ftp_in_init {

    my ( $self, $running_ftpserver ) = @_;

    say "\nHalting $running_ftpserver";
    my $output = $self->{init}->run_command( $running_ftpserver, 'stop' );
    say "\nDisabling $running_ftpserver in init system";
    $output = $self->{init}->run_command_for_one(
        'disable',
        $running_ftpserver,
    );

    return;
}

sub _unlink_disable_files {

    my ($self) = @_;

    foreach my $disable_file ( qw(ftpd ftpserver), @FTP_SERVERS ) {
        unlink "/etc/${disable_file}disable"
          if -e "/etc/${disable_file}disable";
    }

    return;
}

sub _unlink_auth_check_disabled {

    my ($self) = @_;

    # This will be recreated if appropriate when configuration is done
    unlink '/var/cpanel/ftpd_service_auth_check_disabled'
      if -e '/var/cpanel/ftpd_service_auth_check_disabled';

    return;
}

sub _build_ftp_conf {
    my ($self) = @_;
    my @build_ftp_conf = $self->{html} ? ('--html') : ();
    system '/usr/local/cpanel/bin/build_ftp_conf', @build_ftp_conf;
    return;
}

sub _enable_ftp_server_in_init {
    my ( $self, $new_ftpserver ) = @_;

    say "\nEnabling $new_ftpserver in init system";
    my $output = $self->{init}->run_command_for_one(
        'enable',
        $new_ftpserver,
    );

    return;
}

sub _restart_ftpd {

    my ($self) = @_;

    my @restart_args = $self->{html} ? ( 1, 0, \&Cpanel::Encoder::Tiny::safe_html_encode_str ) : ();
    print join "\n", Cpanel::Services::Restart::restartservice(
        'ftpd',
        @restart_args,
    );

    return;
}

sub enable_ftpserver {
    my ( $self, $new_ftpserver, $current_ftpserver ) = @_;

    $self->_unlink_disable_files();

    if ( $current_ftpserver ne 'disabled' ) {
        $self->_halt_and_disable_ftp_in_init($current_ftpserver);
    }

    $self->_unlink_auth_check_disabled();

    say "\nSwitching FTP server to $new_ftpserver";
    $self->install_cpanel_rpms();

    $self->_build_ftp_conf();

    $self->_enable_ftp_server_in_init($new_ftpserver);

    $self->_restart_ftpd();

    require Cpanel::UIUtils::Update;
    Cpanel::UIUtils::Update::trigger_ui_updates();

    return;
}

sub install_cpanel_rpms {
    my $self = shift;

    say "\nUpdating FTP related RPMs";
    system qw(/usr/local/cpanel/scripts/check_cpanel_pkgs --fix --long-list),
      ( $ENV{'CPANEL_BASE_INSTALL'} ? '--no-broken' : () ),
      '--targets' => join ',', @FTP_SERVERS;

    return;
}

sub disable_chksrvd_monitoring {
    my $self = shift;

    my %monitored_services = Cpanel::Chkservd::Manage::getmonitored();
    if ( not $monitored_services{'ftpd'} ) {
        say "\nChksrvd monitoring is disabled";
        return;
    }

    say "\nDisabling Chksrvd monitoring";
    Cpanel::Chkservd::Manage::disable('ftpd');
    my @args = $self->{html} ? ('--html') : ();
    system '/usr/local/cpanel/scripts/restartsrv_chkservd', @args;

    return;
}

sub enable_chksrvd_monitoring {
    my $self = shift;

    my %monitored_services = Cpanel::Chkservd::Manage::getmonitored();
    if ( $monitored_services{'ftpd'} ) {
        say "\nChksrvd monitoring is enabled";
        return;
    }

    say "\nEnabling chksrvd monitoring";
    Cpanel::Chkservd::Manage::enable('ftpd');
    my @args = $self->{html} ? ('--html') : ();
    system '/usr/local/cpanel/scripts/restartsrv_chkservd', @args;

    return;
}

# We don't use pod2usage because it insists upon downcasing "FTP".
sub usage {
    my ($retval) = @_;
    my $fh = $retval ? \*STDERR : \*STDOUT;

    $fh->print(<<EOM);
Usage: setupftpserver [options] <ftpserver>

Options:
  --force                    Run setup despite warnings that this may fail.
  --current                  Display the currently configured FTP server
  --enable-anonymous         Anonymous now defaults to off when moving from
                             disabled. This option forces it on

FTP Servers:
  pure-ftpd  Recommended FTP server on cPanel systems
  proftpd    Alternate FTP server
  disabled   Disable local FTP functionality

EOM
    exit $retval;
}

1;

__END__

=head1 NAME

setupftpserver - Set up an FTP server for use with cPanel

=head1 SYNOPSIS

  setupftpserver [options] <ftpserver>

=head2 FTP Servers:

=over

=item I<pure-ftpd>

Recommended FTP server on cPanel systems

=item I<proftpd>

Alternate FTP server

=item I<disabled>

Disable local FTP functionality

=back

=head1 OPTIONS

Some options below may be preceded with I<no-> in order to negate them.

=over

=item B<--help>

Print a brief help message and exits.

=item B<--[no-]force>

Run setup despite warnings that this may fail.

=item B<--current>

Display the currently configured FTP server.

=item B<--[no-]enable-anonymous>

Anonymous now defaults to off when moving from disabled.
This option forces it on.

=item B<--[no-]html>

Output HTML when reconfiguring and restarting FTP services.

=back

=cut