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#!/usr/local/cpanel/3rdparty/bin/perl # cpanel - scripts/check_valid_server_hostname 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 # package scripts::check_valid_server_hostname; use strict; use warnings; use Cpanel::Locale (); use Cpanel::Usage (); use Cpanel::Config::LoadWwwAcctConf (); use Cpanel::Sys::Hostname (); use Cpanel::Redirect (); use Cpanel::DIp::MainIP (); use Socket (); my $HOSTNAME_OK = 0; my $GENERIC_HOSTNAME_ERROR = 1; my $NEEDS_SET_HOSTNAME = 2; sub script { my $self = shift; my $argv = shift; my $lc = Cpanel::Locale->get_handle(); my %opts = ( notify => 0, quiet => 0, ); Cpanel::Usage::wrap_options( $argv, \&usage, { 'notify' => \$opts{'notify'}, 'quiet' => \$opts{'quiet'} }, ); my $hostname = Cpanel::Sys::Hostname::gethostname(); if ( my $is_manual_hostname = $self->is_manual_hostname( $hostname, \%opts ) ) { if ( $is_manual_hostname == $NEEDS_SET_HOSTNAME ) { require Whostmgr::Hostname; my ( $status, $statusmsg, $msgref, $errref ) = Whostmgr::Hostname::sethostname( $hostname, 1 ); unless ( $opts{'quiet'} ) { if ( $msgref && ref $msgref ) { print "$_\n" for @$msgref; } if ( !$status ) { warn $statusmsg; if ( $errref && ref $errref ) { warn "$_" for @$errref; } } } exit 1 if !$status; } else { exit 1; } } exit 1 unless $self->is_resolv_hostname( $hostname, \%opts ); print $lc->maketext(q{OK}), "\n" unless $opts{'quiet'}; exit 0; } sub usage { my $lc = Cpanel::Locale->get_handle(); print $lc->maketext(q{This tool verifies the server hostname configuration.}), "\n\n"; print $lc->maketext( q{Usage: [_1][comment,a program name] ~[options~]}, $0 ), "\n\n"; print $lc->maketext(q{Options:}), "\n"; print "\t--help ", $lc->maketext(q{Display this help message.}), "\n"; print "\t--notify ", $lc->maketext(q{Send a failure notification to the system administrator.}), "\n"; print "\t--quiet ", $lc->maketext(q{Do not display output, and instead set the [output,asis,UNIX] exit code.}), "\n\n"; exit 0; } # Do not use Cpanel::Hostname::gethostname(). The purpose of this routine # is to reliably detect from the definitive source on Linux, what it thinks # it's running as. That is then compared to the WHM setting. sub is_manual_hostname { my $self = shift; my $hostname = shift; my $opts = shift; my $conf = Cpanel::Config::LoadWwwAcctConf::loadwwwacctconf(); my $lc = Cpanel::Locale->get_handle(); my $old = $lc->set_context_plain(); my $ip = Cpanel::DIp::MainIP::getmainip(); unless ($conf) { my $reason = $lc->maketext(q{The system is unable to retrieve the [output,asis,WHM] hostname configuration information.}); my $solution = $lc->maketext( q{Verify the file system permissions of the “[_1]” file on your server.}, q{/etc/wwwacct.conf} ); $self->send_failure_notification( $opts, { 'status' => 'cannot_read_conf', 'reason' => $reason, 'solution' => $solution, 'hostname' => $hostname, 'ip' => $ip } ); $lc->set_context($old); return $GENERIC_HOSTNAME_ERROR; } my $url = sprintf( 'http://%s:2087/scripts2/changehostname', Cpanel::Redirect::getserviceSSLdomain('whm') ); my $solution = $lc->maketext( q{The system will attempt to synchronize the current hostname “[_1]” to the system configuration.}, $hostname ) . ' ' . $lc->maketext( q{In the future, update your hostname in [output,url,_1,WHM’s] interface (Home » Networking Setup » Change Hostname).}, $url ); unless ( $conf->{'HOST'} ) { my $reason = $lc->maketext(q{The system hostname is not configured in [output,asis,WHM].}); $self->send_failure_notification( $opts, { 'status' => 'host_missing', 'reason' => $reason, 'solution' => $solution, 'hostname' => $hostname, 'ip' => $ip } ); $lc->set_context($old); return $NEEDS_SET_HOSTNAME; } unless ( $hostname eq $conf->{'HOST'} ) { my $reason = $lc->maketext(q{[output,asis,WHM] has detected a manual hostname change.}); $self->send_failure_notification( $opts, { 'status' => 'hostname_host_mismatch', 'reason' => $reason, 'solution' => $solution, 'hostname' => $hostname, 'ip' => $ip } ); $lc->set_context($old); return $NEEDS_SET_HOSTNAME; } $lc->set_context($old); return $HOSTNAME_OK; } # This uses gethostbyname(), because Apache does. If Apache is unable to resolve the # hostname on the machine using the standard default EasyApache profile, then it won't # start (due to mod_unique_id). sub is_resolv_hostname { my $self = shift; my $hostname = shift; my $opts = shift; my $lc = Cpanel::Locale->get_handle(); my $old = $lc->set_context_plain(); my $solution = $lc->maketext( q{Update your system “[_1]” file and/or [output,asis,DNS] server.}, q{/etc/hosts} ); my $ip = Cpanel::DIp::MainIP::getmainip(); my $resolved = gethostbyname($hostname); unless ($resolved) { my $reason = $lc->maketext( q{The system was unable to resolve the system hostname “[_1]” to an [output,asis,IP] address.}, $hostname ); $self->send_failure_notification( $opts, { 'status' => 'cannot_resolve_hostname', 'reason' => $reason, 'solution' => $solution, 'hostname' => $hostname, 'ip' => $ip } ); $lc->set_context($old); return 0; } $lc->set_context($old); return 1; } sub send_failure_notification { my $self = shift; my $opts = shift; my $args = shift; my $lc = Cpanel::Locale->get_handle(); my $old = $lc->set_context_plain(); print STDERR $lc->maketext('ERROR:'), " $args->{'reason'}\n" unless $opts->{'quiet'}; print STDERR "\n$args->{'solution'}\n" if $args->{'solution'}; unless ( $opts->{'notify'} ) { $lc->set_context($old); return 1; } require Cpanel::Notify; Cpanel::Notify::notification_class( 'class' => 'Check::ValidServerHostname', 'application' => 'server_hostname_validator', 'status' => $args->{'status'}, 'interval' => 86400 * 7, 'constructor_args' => [ 'origin' => 'server_hostname_validator', 'reason' => $args->{'reason'}, 'solution' => $args->{'solution'}, 'ip' => $args->{'ip'}, ] ); $lc->set_context($old); return 1; } __PACKAGE__->script( \@ARGV ) unless caller; __END__ =head1 NAME check_valid_server_hostname - Verifies proper configuration of hostname =head1 DESCRIPTION This script checks the hostname of the machine and verifies that the user has properly configured it in cPanel & WHM. Additionally, it performs a DNS check on the hostname. Both of these verifications, in tandem, help to ensure the user has a properly configured and functioning server.

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