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  #   )ˆl–Ðz¾”Jj"TÒzàœ¸”Å£Ð„ËŸÄÎ 'ü    )#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/mainipcheck                     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;

package scripts::mainipcheck;

use Cpanel::IP::LocalCheck   ();
use Cpanel::IP::Loopback     ();
use Cpanel::Linux::RtNetlink ();
use Cpanel::LoadModule       ();
use Cpanel::Logger           ();
use Cpanel::NAT::Object      ();
use Cpanel::SafeRun::Object  ();
use Cpanel::FileUtils::Write ();
use Cpanel::LoadFile         ();
use Cpanel::DIp::LicensedIP  ();
use Cpanel::Exception        ();
use Socket                   ();

use Try::Tiny;

use Getopt::Long qw(GetOptionsFromArray);

our $MAINIP_FILE = '/var/cpanel/mainip';

exit( __PACKAGE__->script( \@ARGV ) ) unless caller();

sub script {
    my ( $class, $argv ) = @_;

    my $remote_check;
    GetOptionsFromArray(
        $argv,
        'remote-check' => \$remote_check,
    ) if defined $argv and ref $argv eq 'ARRAY';

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

    my $mainip_file_contents = eval { Cpanel::LoadFile::loadfile($MAINIP_FILE) // '' };
    my $mainip               = $mainip_file_contents =~ s/\s+//gr;
    my $myip_url             = Cpanel::DIp::LicensedIP::myip_url();
    my $cpIP                 = Cpanel::DIp::LicensedIP::get_license_ip($myip_url);
    my $default_route_ip;
    my $update_mainip      = $mainip ne $mainip_file_contents;    # Clean up formatting of the file if true
    my $mainip_file_exists = -e $MAINIP_FILE;                     # No sense in stat-ing the file twice like we used to in certain scenarioes

    # Needed for NAT awareness, is NO-OP on non-NAT to these values (thus local and public IP values would be the same on non-nat systems).
    my $NAT_obj      = Cpanel::NAT::Object->new();
    my $NAT_local_ip = $NAT_obj->get_local_ip($cpIP);

    if ($remote_check) {
        print "$cpIP\n";
        return 0;
    }

    eval { $default_route_ip = get_ip_from_netlink() || get_ip_from_default_route(); };
    if ( my $error_message = $@ ) {
        chomp $error_message;
        $logger->warn("Encountered an error while determining the main IP from the default route: $error_message");
        ($mainip_file_exists) ? die "/var/cpanel/mainip exists. Bailing out..." : $logger->info("Proceeding with main IP check assuming that the IP address from $myip_url is the main IP address.");
        $default_route_ip = $mainip;    # XXX Should we keep going even here? I'm not sure.
    }
    my $NAT_public_ip = $NAT_obj->get_public_ip($default_route_ip);

    my $canonical_main_ip = $default_route_ip || $NAT_local_ip;
    if ( !$mainip_file_exists ) {
        $update_mainip = 1;             # I'm somewhat curious as to whether we'd wanna update SPF records here too, honestly.
    }
    elsif ( $canonical_main_ip ne $mainip ) {
        $update_mainip = 1;
        $logger->info("The Server's main IP address has changed from $mainip to $canonical_main_ip.");

        # At one point, the below condition turned $default_route_ip into $cpIP, causing logger warns to actually get suppressed
        # when they would normally be spuriously reported for NATted systems.
        # This is because all the check for the logger warn below used to be if $default_route_ip ne $cpIP.
        # This would never be true when we had to update the mainip previously.
        if ( !Cpanel::IP::LocalCheck::ip_is_on_local_server($cpIP) ) {
            $logger->warn("$cpIP is not bound to an interface on the system! Please verify your network configuration.");

            # This can trigger pretty trivially on NAT setups if your cpnat configuration is not built or in fact insane.
            # Just make /var/cpanel/cpnat contain non-ip strings as if they were a key=>value nat IP pair separated
            # by spaces if you want to see th