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|
#!/usr/bin/perl
#
# Module: vyos-restore-static-ipv6.pl
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# Copyright (C) 2014 VyOS Development Group
#
# **** End License ****
use lib "/opt/vyatta/share/perl5";
use strict;
use warnings;
use POSIX;
use Fcntl;
use Sys::Syslog;
use Vyatta::Config;
use Vyatta::Interface;
use Data::Dumper;
use constant
{
# Program settings
PROGRAM_NAME => "vyos-intfwatchd",
PROGRAM_VERSION => "1.0",
PID_FILE => "/var/run/vyos-intfwatchd.pid",
# Program exit codes
SUCCESS => 0,
ERROR => 1,
# Subroutine error codes
SUB_ERROR => 0,
SUB_SUCCESS => 1,
# Fcntl file lock/unlock constants
SET_EXCLUSIVE_LOCK => 2,
UNLOCK => 8
};
my $debug = 0;
sub daemonize
{
syslog("info", "%s", "Starting in daemon mode");
my $pid = fork();
if (!defined($pid))
{
# Fork failed
die "Could not spawn child process: $!, exiting";
}
elsif ($pid > 0)
{
# Child has been spawned succefully,
# parent should terminate now
exit(SUCCESS);
}
chdir("/");
umask(0);
setsid();
# Close standard i/o stream descriptors
open STDIN, "/dev/null" or die "Can't read /dev/null: $!";
open STDOUT, ">>/dev/null" or die "Can't write to /dev/null: $!";
open STDERR, ">>/dev/null" or die "Can't write to /dev/null: $!";
}
sub writePid
{
my ($pid, $fh) = @_;
unless (flock($fh, SET_EXCLUSIVE_LOCK))
{
syslog("err", "%s", "Could not lock PID file: $!");
exit(ERROR);
}
print($fh $pid);
}
sub releasePid
{
my $fh = shift;
flock($fh, UNLOCK);
close($fh);
unlink(PID_FILE);
}
daemonize();
my $pidFile = PID_FILE;
unless (open PID_HANDLE, ">$pidFile")
{
syslog("err", "%s", "Could not create PID file: $!");
exit(1);
}
writePid($$, \*PID_HANDLE);
my $config = new Vyatta::Config();
my $ip_monitor = "ip monitor link";
unless (open(HANDLE, "$ip_monitor|"))
{
syslog("err", "%s", qq{Could not start IP monitor: $!\n});
exit(1);
}
sub terminate
{
my $error = shift;
syslog("notice", "%s", PROGRAM_NAME." is terminating");
releasePid(\*PID_HANDLE);
exit(0);
}
$SIG{'INT'} = \&terminate;
$SIG{'TERM'} = \&terminate;
$SIG{'KILL'} = sub { exit(0); };
# This solution should be bad enough to be fixed immediately
# when feasible.
while(<HANDLE>)
{
if( $_ =~ /^[0-9]+:\s+([^@]+)(@.*)*:\s+<.*UP,.*>/ )
{
my $intf_name = $1;
my $intf = new Vyatta::Interface($intf_name);
my $intf_addr_path = $intf->path() . " address";
# Get IPv6 addresses
my @addresses = grep /:/, $config->returnEffectiveValues($intf_addr_path);
print Dumper(@addresses) if $debug;
foreach my $address (@addresses)
{
system("ip address add $address dev $intf_name");
if( $? != 0 )
{
syslog("err", "%s", "Could not add address $address: $!");
}
else
{
syslog("notice", "%s", "Restoring address $address on interface $intf_name");
}
}
$intf = undef;
}
}
|
