| Current File : //scripts/mainipcheck |
#!/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 this in action.
}
# Ensure the license system has what it needs? Not sure how it gets the updated mainip or if it even needs it?
_reprovision_license_authn();
require Cpanel::ServerTasks;
# Update SPF records, as we've changed to a new mainip
Cpanel::ServerTasks::schedule_task( ['SPFTasks'], 5, 'update_all_users_spf_records' );
$logger->info("Scheduled SPF record update");
}
if ($update_mainip) {
Cpanel::FileUtils::Write::overwrite( $MAINIP_FILE, $canonical_main_ip, 0644 );
}
if ( !$NAT_obj->enabled && $default_route_ip ne $cpIP ) {
$logger->warn("$myip_url detects system IP as $cpIP and system local IP detected as $default_route_ip. Please verify your network configuration.");
}
elsif ( $NAT_obj->enabled && $NAT_public_ip ne $cpIP && $NAT_local_ip ne $default_route_ip ) {
# Entertaingly enough, in this instance, $NAT_local_ip always equals $cpIP and vice versa. Conveniently enough, it also catches all invalid NAT configs.
$logger->warn("$myip_url detects a system IP address of $cpIP and system local IP address of $default_route_ip.");
$logger->warn("This looks like a NAT setup, but these IP addresses do not correspond to values listed in /var/cpanel/cpnat.");
$logger->info("The system will now rebuild your cpnat configuration to ensure system sanity.");
_system('/usr/local/cpanel/scripts/build_cpnat');
}
return 0;
}
# For mocking in tests -- don't remove the 'uncoverable' comments below, as this impacts Devel::Cover reporting.
sub _system {
# uncoverable subroutine
return system @_; # uncoverable statement
}
# Pick a testing IP and see how the kernel proposes routing it, then look up and return the source address which would be used.
sub get_ip_from_netlink {
my $TEST_IP = '208.74.123.2'; # TODO: Better way of picking an IP with high probability of not being routed specially?
my $result_ip = '';
try {
my $routes_ar = Cpanel::Linux::RtNetlink::get_route_to( 'AF_INET', $TEST_IP );
foreach my $route_info_hr (@$routes_ar) {
if ( defined $route_info_hr->{'rta_dst'} && $route_info_hr->{'rta_dst'} eq $TEST_IP ) {
$result_ip = $route_info_hr->{'rta_prefsrc'};
last;
}
}
}
catch {
Cpanel::Logger->new()->warn( 'Failed to retrieve IP via Netlink: ' . Cpanel::Exception::get_string_no_id($_) . "\nFalling back to reading /proc/net/route." );
};
return $result_ip;
}
# Get interface associated with default route and use socket() to get IP
sub get_ip_from_default_route {
my $proc_route_path = shift || '/proc/net/route'; # For unit testing, mostly
my %interfaces;
if ( open my $proc_fh, '<', $proc_route_path ) {
while ( my $line = readline $proc_fh ) {
chomp $line;
if ( $line =~ m/^(.+?)\s*0{8}\s.*?(\d+)\s+0{8}\s*(?:\d+\s*){3}$/ ) {
my ( $interface, $metric ) = ( $1, $2 );
push @{ $interfaces{$metric} }, $interface;
}
}
close($proc_fh);
}
else {
die("Unable to open $proc_route_path: $!");
}
my $lowest_metric = ( sort keys %interfaces )[0];
my $interface = $interfaces{$lowest_metric}[0];
my $ip = get_ip_from_interface($interface);
# VPS issues
if ( Cpanel::IP::Loopback::is_loopback($ip) && $interface =~ /^venet0?$/ ) {
return get_ip_from_interface('venet0:0');
}
return $ip;
}
sub get_ip_from_interface {
my $interface = shift;
my $SIOCGIFADDR = 0x8915;
my $proto = getprotobyname('ip');
socket( my $socket_fh, &Socket::PF_INET, &Socket::SOCK_DGRAM, $proto ) or die("Socket error: $!");
# struct ifreq is 16 bytes of name, null-padded, followed by 16 bytes of answer.
my $ifreq = pack( 'a32', $interface );
ioctl( $socket_fh, $SIOCGIFADDR, $ifreq ) or die("Error in ioctl: $!");
my ( $if, $sin ) = unpack( 'a16 a16', $ifreq );
my ( $port, $addr ) = Socket::sockaddr_in($sin);
my $ip;
foreach my $family ( &Socket::AF_INET, &Socket::AF_INET6 ) {
last if $ip;
# Generally we'll favor ipv4 addresses over ipv6, but we should use the v6 if it is the only one available.
$ip = Socket::inet_ntop( $family, $addr );
}
return $ip;
}
sub _reprovision_license_authn {
Cpanel::LoadModule::load_perl_module('Cpanel::Market');
Cpanel::Market::set_cpstore_is_in_sync_flag(0);
#
# This will cause the system to get new LicenseAuthn
# credentials so we can connect to various cPanel systems
# that require license-based authentication.
#
my $run = Cpanel::SafeRun::Object->new( 'program' => '/usr/local/cpanel/cpkeyclt' );
warn $run->autopsy() if $run->CHILD_ERROR;
#
# cpkeyclt will auto re-provision on the second run
# if the id changes
#
$run = Cpanel::SafeRun::Object->new(
'program' => '/usr/local/cpanel/scripts/try-later',
'args' => [
'--action', '/usr/local/cpanel/cpkeyclt --quiet',
'--check', '/bin/sh -c exit 1',
'--delay', 11, # We only allow updates every 10 minutes so wait 11
'--max-retries', 1,
'--skip-first'
]
);
warn $run->autopsy() if $run->CHILD_ERROR;
#
# If they changed the ip for the license in manage2 they keep the
# same liscid so we need to check after the license update has
# happened the second time
#
$run = Cpanel::SafeRun::Object->new(
'program' => '/usr/local/cpanel/scripts/try-later',
'args' => [
'--action', '/usr/local/cpanel/bin/check_cpstore_in_sync_with_local_storage',
'--check', '/bin/sh -c exit 1',
'--delay', 15, # Must happen after the second license update
'--max-retries', 1,
'--skip-first'
]
);
warn $run->autopsy() if $run->CHILD_ERROR;
return 1;
}