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#!/usr/bin/perl
#
# Module: vyatta-dhcpv6-client.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.
#
# This code was originally developed by Vyatta, Inc.
# Copyright (C) 2010 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Bob Gilligan <gilligan@vyatta.com>
# Date: April 2010
# Description: Start and stop DHCPv6 client daemon for an interface.
#
# **** End License ****
#
#
use strict;
use warnings;
use lib "/opt/vyatta/share/perl5/";
use Sys::Hostname;
use Vyatta::Config;
use Vyatta::Interface;
use Getopt::Long;
sub gen_conf_file {
my ($conffile, $ifname) = @_;
my $FD_WR;
open($FD_WR, '>', $conffile)
or die "Can't write config file: $conffile : $!\n";
my $date = localtime;
my $user = getpwuid($<);
print $FD_WR "# This file was auto-generated by the Vyatta\n";
print $FD_WR "# configuration sub-system. Do not edit it.\n";
print $FD_WR "\n";
print $FD_WR "# Generated on $date by $user\n";
print $FD_WR "#\n";
print $FD_WR "interface \"$ifname\" {\n";
my $intf = new Vyatta::Interface($ifname)
or die "Can't find interface $ifname\n";
my $level = $intf->path() . ' dhcpv6-options';
my $config = new Vyatta::Config;
$config->setLevel($level);
if ($config->exists('duid')) {
my $duid = $config->returnValue('duid');
print $FD_WR " send dhcp6.client-id $duid;\n";
}
# my $hostname = hostname;
# print $FD_WR " send host-name \"$hostname\";\n";
# print $FD_WR " send dhcp6.oro 1, 2, 7, 12, 13, 23, 24, 39;\n";
print $FD_WR "}\n";
close $FD_WR;
}
sub usage {
print "Usage: $0 --ifname=ethX --{start|stop|renew|release}\n";
exit 1;
}
#
# Main Section
#
my $start_flag; # Start the daemon
my $stop_flag; # Stop the daemon and delete all config files
my $release_flag; # Stop the daemon, but leave config file
my $renew_flag; # Re-start the daemon. Functionally same as start_flag
my $ifname;
my $temporary;
my $params_only;
GetOptions("start" => \$start_flag,
"stop" => \$stop_flag,
"release" => \$release_flag,
"renew" => \$renew_flag,
"ifname=s" => \$ifname,
"temporary" => \$temporary,
"parameters-only" => \$params_only
) or usage();
die "Error: Interface name must be specified with --ifname parameter.\n"
unless $ifname;
my $pidfile = "/var/lib/dhcp/dhclient_v6_$ifname.pid";
my $leasefile = "/var/lib/dhcp/dhclient_v6_$ifname.leases";
my $conffile = "/var/lib/dhcp/dhclient_v6_$ifname.conf";
my $cmdname = "/sbin/dhclient";
if ($release_flag) {
die "DHCPv6 client is not configured on interface $ifname.\n"
unless (-e $conffile);
die "DHCPv6 client is already released on interface $ifname.\n"
unless (-e $pidfile);
}
if ($renew_flag) {
die "DHCPv6 client is not configured on interface $ifname.\n"
unless (-e $conffile);
}
if (defined($stop_flag) || defined ($release_flag)) {
# Stop dhclient -6 on $ifname
printf("Stopping daemon...\n");
system("$cmdname -6 -cf $conffile -pf $pidfile -lf $leasefile -x $ifname");
# Delete files it leaves behind...
printf("Deleting related files...\n");
unlink($pidfile);
if (defined $stop_flag) {
# If just releasing, leave the config file around as a flag that
# DHCPv6 remains configured on this interface.
unlink($conffile);
}
}
if (defined($start_flag) || defined ($renew_flag)) {
# Generate the DHCP client config file...
gen_conf_file($conffile, $ifname);
# First, kill any previous instance of dhclient running on this interface
#
printf("Stopping old daemon...\n");
system("$cmdname -6 -pf $pidfile -x $ifname");
# Wait for IPv6 duplicate address detection to finish, dhclient won't start otherwise
# https://phabricator.vyos.net/T903
for (my $attempt_count = 0; $attempt_count <= 60; $attempt_count++) {
# Check for any non-tentative addresses (exit code 0 if any exist, 1 otherwise)
if (system("test -n \"\$(ip -6 -o addr show dev $ifname scope link -tentative)\"") != 0) {
# No non-tentative address found, sleep and retry or exit
if ($attempt_count == 0) {
print "Duplicate address detection incomplete, waiting\n"
}
if ($attempt_count < 60) {
sleep(1);
next;
} else {
print "Error: No non-tentative address was found for interface $ifname\n";
exit 1;
}
} else {
# Address found, exit loop
last;
}
}
if (defined($temporary) && defined($params_only)) {
print "Error: temporary and parameters-only options are mutually exclusive!\n";
exit 1;
}
my $temp_opt = defined($temporary) ? "-T" : "";
my $po_opt = defined($params_only) ? "-S" : "";
printf("Starting new daemon...\n");
exec "$cmdname -6 $temp_opt $po_opt -nw -cf $conffile -pf $pidfile -lf $leasefile $ifname"
or die "Can't exec $cmdname";
}
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