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

# cpanel - scripts/buildeximconf                   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 warnings;

use Cpanel::DKIM                 ();
use Cpanel::Logger               ();
use Cpanel::Exim::Config         ();
use Cpanel::Exception            ();
use Cpanel::FileUtils::Lines     ();
use Cpanel::Signal               ();
use Cpanel::StringFunc::Replace  ();
use Cpanel::Encoder::Tiny        ();
use Cpanel::FileUtils::Write     ();
use Cpanel::IP::Neighbors        ();
use Cpanel::IP::GreyList         ();
use Cpanel::IP::cPanelMail       ();
use Cpanel::Email::Perms::System ();
use Try::Tiny;

local $SIG{'HUP'} = 'IGNORE';

umask(0022);

my $logger = Cpanel::Logger->new();

require '/usr/local/cpanel/scripts/checkexim.pl';

Cpanel::IP::Neighbors::update_neighbor_netblocks_or_log();
Cpanel::IP::GreyList::update_trusted_netblocks_or_log();
Cpanel::IP::GreyList::update_common_mail_providers_or_log();
Cpanel::IP::cPanelMail::update_cpanel_mail_netblocks_or_log();
Cpanel::DKIM::setup_file_stores();
Cpanel::Email::Perms::System::ensure_system_perms();

my %OPTS           = ();
my $use_alt_config = @ARGV && grep( /--local/,          @ARGV ) ? 1 : 0;
my $acl_dry_run    = @ARGV && grep( /--acl_dry_run/,    @ARGV ) ? 1 : 0;
my $no_chown_spool = @ARGV && grep( /--no_chown_spool/, @ARGV ) ? 1 : 0;
my $debug          = @ARGV && grep( /--debug/,          @ARGV ) ? 1 : 0;
if ($use_alt_config) {
    foreach my $alt_config ( grep( /--local/, @ARGV ) ) {
        my ( $filetype, $file ) = $alt_config =~ /--([^=]+)=(.*)$/;
        $OPTS{$filetype} = $file;
    }
}
$OPTS{'acl_dry_run'} = 1 if $acl_dry_run;
$OPTS{'debug'}       = $debug;

# CPANEL-36167: Run hulkdsetup to ensure that keys for dovecot are present:
system '/usr/local/cpanel/bin/hulkdsetup';

my $exim_cfgobj = Cpanel::Exim::Config->new(%OPTS);

$exim_cfgobj->run_script('pre') if !$use_alt_config && !$acl_dry_run;

my %CFDATA = $exim_cfgobj->generate_config_file();

my $rawout = $CFDATA{'rawout'};

if ( $use_alt_config || $acl_dry_run ) {
    if ( !$CFDATA{'goodconf'} ) {
        print "Dry Run failed\n";
        print "Configuration file has an invalid syntax. " . ( $ENV{'WHM50'} ? "<a href='javascript:select_exim_advanced(1);'>" : '' ) . "Please try the edit again." . ( $ENV{'WHM50'} ? "</a>" : '' ) . "\n\n";
        print $ENV{'WHM50'} ? "<div id='broken_cfg_html' class='brush: plain; highlight: " . $exim_cfgobj->{'error_line'} . "'>" . Cpanel::Encoder::Tiny::safe_html_encode_str( $exim_cfgobj->{'broken_cfg_html'} ) . "</div>" : $exim_cfgobj->{'broken_cfg_text'};
        print $rawout;
        exit 1;
    }
    else {
        print "Dry Run ok\n";
        print $rawout;
        exit 0;
    }
}

if ( !$CFDATA{'goodconf'} ) {
    print "Configuration file has an invalid syntax. " . ( $ENV{'WHM50'} ? "<a href='javascript:select_exim_advanced(1);'>" : '' ) . "Please try the edit again." . ( $ENV{'WHM50'} ? "</a>" : '' ) . "\n\n";
    print $rawout;

    #
    # We go back 12 lines and forward 2 as this is enough
    # to show almost all transport and router name which
    # will make it much easier to determine the failure
    # point.
    #
    print "-= BEGIN exim.conf chunk -=\n";
    my @lines = split( /\n/, $exim_cfgobj->{'broken_cfg_text'} );
    print join( "\n", @lines[ $exim_cfgobj->{'error_line'} - 12 .. $exim_cfgobj->{'error_line'} + 2 ] ) . "\n";
    print "-= END exim.conf chunk -=\n";

    $exim_cfgobj->install_virgin_config_if_missing( $CFDATA{'config_template'} );
    $exim_cfgobj->run_script( 'post', 'fail' );

    exit 1;
}
else {
    if ( Cpanel::FileUtils::Write::overwrite_no_exceptions( '/etc/exim.conf', $CFDATA{'cfg'}, 0644 ) ) {
        Cpanel::FileUtils::Write::overwrite_no_exceptions( '/usr/local/etc/exim/configure', $CFDATA{'cfg'}, 0644 ) if -e '/usr/local/etc/exim/configure';

        # XXX ugly hack, because changes to files subject to .include or .include_if_exists can't do dry runs
        # SRS only gets away with it because it doesn't change, and if it does change, it's not the end of the world
        if ( $CFDATA{'settings'}->{'smarthost_routelist'} && $CFDATA{'settings'}->{'smarthost_auth_required'} ) {
            if (
                !Cpanel::FileUtils::Write::overwrite_no_exceptions(
                    $Cpanel::Exim::Config::SMARTHOST_AUTH_FILE,
                    <<~EOS,
                    smarthost_login:
                      driver = plaintext
                      public_name = LOGIN
                      hide client_send = : $CFDATA{'settings'}->{'smarthost_username'} : $CFDATA{'settings'}->{'smarthost_password'}
                    EOS
                    0600
                )
            ) {
                die "Unable to write $Cpanel::Exim::Config::SMARTHOST_AUTH_FILE: $!";
            }
        }
    }
    else {
        die "Unable to write /etc/exim.conf: $!";
    }

    print "Configuration file passes test!  New configuration file was installed.\n\n";

    $exim_cfgobj->setup_spamassassin_handling( $CFDATA{'acl_spam_handler'} );
    $exim_cfgobj->build_and_install_exim_pl();

    print $exim_cfgobj->{'rawout'};

    # SPF is required for KAM and other rulesets so enable by default
    my $sa_init_pre_file      = '/etc/mail/spamassassin/init.pre';
    my $sa_match_regex_string = '^\s*#loadplugin Mail::SpamAssassin::Plugin::SPF';
    if ( Cpanel::FileUtils::Lines::has_txt_in_file( $sa_init_pre_file, $sa_match_regex_string ) ) {
        Cpanel::StringFunc::Replace::regsrep( $sa_init_pre_file, $sa_match_regex_string, 'loadplugin Mail::SpamAssassin::Plugin::SPF' );
    }

    $exim_cfgobj->run_script( 'post', 'ok' );

    scripts::checkexim::checkeximperms($no_chown_spool);

    my $err;
    try {
        Cpanel::Exim::Config::configure_outgoing_spam_scanning();
    }
    catch {
        $err = $_;
        if ( -t STDERR ) {
            require Cpanel::Term::ANSIColor::Solarize;
            print STDERR Cpanel::Term::ANSIColor::Solarize::colored( ["bold black on_red"], Cpanel::Exception::get_string($err) ) . "\n";
        }
        else {
            print STDERR Cpanel::Exception::get_string($err) . "\n";
        }
    };

    system '/usr/local/cpanel/scripts/mailscannerupdate', '--force';
    system '/usr/local/cpanel/scripts/smtpmailgidonly',   '--refresh';
    system '/usr/local/cpanel/scripts/update_exim_rejects';

    my $exim_caps                    = $exim_cfgobj->{'exim_caps'};
    my $needs_mail_gid_shadow        = 0;
    my $configured_for_external_auth = 1;                             # dovecot always enabled

    # Signal cpsrvd to reload its config. Active page hits will not be killed.
    # do not restart cpsrvd on a fresh install ( cpsrvd is running but is restarted later )
    #   this avoids to solve continuously "perl dependencies issues" in the exim rpm
    Cpanel::Signal::send_hup_cpsrvd() if !$ENV{'CPANEL_BASE_INSTALL'};

    exit 0;
}