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

# cpanel - scripts/mysqlconnectioncheck            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::mysqlconnectioncheck;
#

use strict;
use warnings;

use Cpanel::MysqlUtils::Check        ();
use Cpanel::MysqlUtils::MyCnf::Basic ();
use Cpanel::Hostname                 ();
use Cpanel::Exception                ();
use Cpanel::MysqlUtils::RootPassword ();
use Cpanel::Services::Enabled        ();
use Cpanel::PIDFile                  ();

use Try::Tiny;

local $| = 1;

our $service  = 'mysqlconnectioncheck';
our $lockfile = '/var/cpanel/mysqlconnectioncheck.pid';

exit( __PACKAGE__->script() ) unless caller;

sub script {
    my ( $pkg, %opts ) = @_;

    return 0 if !Cpanel::Services::Enabled::is_provided(q{mysql});

    # Restartsrv will call mysqlconnectioncheck
    # In order to avoid this locking forever
    # we have a check to see if we are calling ourselves
    return 0 if ( $ENV{'MYSQLCCHK'} && $ENV{'MYSQLCCHK'} eq '1' );
    local $ENV{'MYSQLCCHK'} = 1;

    my $hostname        = Cpanel::Hostname::gethostname();
    my $dbhost          = Cpanel::MysqlUtils::MyCnf::Basic::getmydbhost('root') || 'localhost';
    my $dbpassword      = Cpanel::MysqlUtils::MyCnf::Basic::getmydbpass('root');                  # read from /root/.my.cnf
    my $is_remote_mysql = Cpanel::MysqlUtils::MyCnf::Basic::is_remote_mysql();

    my $exit_status;
    try {
        $exit_status = Cpanel::PIDFile->do(
            $lockfile,
            sub {
                if ( !$dbpassword ) {
                    attempt_password_set();
                }

                my ( $connection_ok, $connection_failure_reason, $connection_failure_message ) = Cpanel::MysqlUtils::Check::check_mysql_connection();
                my $notify_data = {
                    'hostname'        => $hostname,
                    'is_remote_mysql' => $is_remote_mysql,
                    'dbhost'          => $dbhost,
                    'dbpassword'      => ( $dbpassword || '' ),
                    'error'           => $connection_failure_message,
                    'root_my_cnf'     => '/root/.my.cnf'                # move to Cpanel::ConfigFiles after 11.42 backport
                };
                if ( $connection_ok || $connection_failure_reason eq 'cannot_connect' ) {
                    return $connection_ok ? 0 : 1;
                }

                # So, there's more than one reason for authentication to fail which attempt_password_reset
                # will fix -- The most obvious case is access_denied, but you can also have a misconfiguration
                # regarding the hostname component of the username. In this case, you can additionally see
                # errors in server handshakes due to the certificate used by the server not matching the hostname
                # you are using for the connection.
                elsif ( $connection_failure_reason eq 'access_denied' or $connection_failure_message =~ m/Error in server handshake/ ) {
                    if ($is_remote_mysql) {
                        _notify( 'cannot_reset_remote_pass', $notify_data );
                    }
                    else {
                        return attempt_password_reset( $notify_data, $opts{disable_integration_output} );
                    }
                }
                else {
                    print "[$0] Failed to connect: $connection_failure_message\n";
                    _notify( 'unknown_error', $notify_data );
                }

                # If we got here, something has gone wrong, but we're not sure what
                return 1;
            }
        );
    }
    catch {
        print Cpanel::Exception::get_string($_) . "\n";
        $exit_status = 1;
    };

    return $exit_status;
}

sub attempt_password_set {
    print "No MySQL password set!\n";
    print "Attempting to set the MySQL root user's password.\n";

    eval {
        require Cpanel::MysqlUtils::ResetRootPassword;
        my $newpass = Cpanel::MysqlUtils::ResetRootPassword::get_root_password_that_meets_password_strength_requirements();
        Cpanel::MysqlUtils::RootPassword::set_mysql_root_password($newpass);
    };
    if ($@) {
        print "There was an error while setting the mysql root password: $@\n";
        return 0;
    }
    return 1;
}

sub attempt_password_reset {
    my ( $notify_data, $disable_output ) = @_;

    require Cpanel::MysqlUtils::ResetRootPassword;
    require Cpanel::MysqlUtils::Integration;

    my ( $newpass, $reset_obj, $reset_ok, $reset_message );
    try {
        $newpass   = Cpanel::MysqlUtils::ResetRootPassword::get_root_password_that_meets_password_strength_requirements();
        $reset_obj = Cpanel::MysqlUtils::ResetRootPassword->new( 'password' => $newpass );
    }
    catch {
        $reset_message = Cpanel::Exception::get_string($_);
    };
    if ( !$reset_message ) {
        ( $reset_ok, $reset_message ) = $reset_obj->reset();

        if ($reset_ok) {

            local $@;
            eval { Cpanel::MysqlUtils::RootPassword::update_mysql_root_password_in_configuration($newpass) };
            if ($@) {
                print "There was an error while updating configuration with the new mysql root password: $@\n";
            }
        }
    }
    print "$reset_message\n" if $reset_message;

    my ($connect_ok_second_time) = Cpanel::MysqlUtils::Check::check_mysql_connection();

    if ($connect_ok_second_time) {
        _notify( 'reset_pass_successful', $notify_data );
        local ( *STDOUT, *STDERR );

        if ($disable_output) {
            open( \*STDOUT, '>&', \*STDERR ) or warn $!;
        }
        Cpanel::MysqlUtils::Integration::update_apps_that_use_mysql_in_background();
        return 0;
    }
    else {
        $notify_data->{'reset_error'} = $reset_message;
        _notify( 'reset_pass_failed', $notify_data );
    }

    return 1;
}

sub _notify {
    my ( $action, $data ) = @_;

    require Cpanel::Notify;
    require Cpanel::IP::Remote;
    return Cpanel::Notify::notification_class(
        'class'            => 'Check::MysqlConnection',
        'application'      => $service,
        'interval'         => 3600,
        'status'           => $action,
        'constructor_args' => [
            %{$data},
            'origin'            => $service,
            'action'            => $action,
            'source_ip_address' => Cpanel::IP::Remote::get_current_remote_ip(),
        ],
    );
}