#!/usr/bin/perl
#
#	Copyright (c) 2002 Apple Computer, Inc. All rights reserved.
#
# @APPLE_LICENSE_HEADER_START@
# 
# "Portions Copyright (c) 2002 Apple Computer, Inc.  All Rights
# Reserved.  This file contains Original Code and/or Modifications of
# Original Code as defined in and that are subject to the Apple Public
# Source License Version 1.0 (the 'License').  You may not use this file
# except in compliance with the License.  Please obtain a copy of the
# License at http://www.apple.com/publicsource and read it before using
# this file.
# 
# The Original Code and all software distributed under the License are
# distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
# EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
# INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
# License for the specific language governing rights and limitations
# under the License."
# 
# @APPLE_LICENSE_HEADER_END@
#
#	Setup IPv6 for Darwin
#		- Startup/shutdown IPv6 on the given interface
#		- Startup/shutdown 6to4 on the given interface
#		- Start/stop router advertisement.
#
#	Setup 6to4 IPv6, for NetBSD (and maybe others)
#
#	(c) Copyright 2000 Hubert Feyrer <hubert@feyrer.de>
#


# Directory for conf file
$etcdir="/private/etc";
require "$etcdir/6to4.conf";

use Getopt::Std;

###########################################################################
sub do_6to4_setup
{
	#
	# Some sanity checks - check for link-local address and stf
	#
	if (`ifconfig -a | grep fe80: | wc -l` <= 0 or
		`ifconfig -a | grep stf | wc -l` <= 0) {
		die "$0: It seems your kernel does not support IPv6 or 6to4 (stf).\n";
	}
	
	#
	# Take the requested interface from the user
	# Figure out addressing, etc.
	#
	$localadr4 = `ifconfig $ARGV[1] inet | grep inet`;
	$localadr4 =~ s/^.*inet\s*//;
	$localadr4 =~ s/\s.*$//;
	chomp($localadr4);
	
	@l4c = split('\.', $localadr4);
	$prefix = sprintf("2002:%02x%02x:%02x%02x", @l4c[0..3]);
		
	$localadr6 = sprintf("$prefix:%04x", $v6_net);
	
	#
	# Anycast is default in 6to4.conf file
	#
	if ($peer eq "6to4-anycast") {
		# magic values from rfc 3068
		$remoteadr4 =  "192.88.99.1";
		$remoteadr6 =  "2002:c058:6301::";
	} 
	else {
		chomp($remoteadr4 = `host $peer`);
		$remoteadr4 =~ s/^.*address //;
	
		chomp($remoteadr6 = `host -t AAAA $peer`);
		$remoteadr6 =~ s/^.*address //;
	}
	
}

###########################################################################
sub do_usage
{
    print "Usage: $0 \n";
    print "	start-v6 all | stop-v6 all\n";
    print "	start-v6 [interface] | stop-v6 [interface]\n";
    print "	start-stf [interface] | stop-stf\n";
    print "	start-rtadvd | stop-rtadvd\n";
}
###########################################################################

#
# Process options - just help for now
#
getopts('h');

if ($opt_h) {
    do_usage;
    exit 0;
}

#
# Handle commands
#

# Start IPv6
if ($ARGV[0] eq "start-v6" or $ARGV[0] eq "v6-start") {
	if ($ARGV[1] eq "all") {
		print "Starting IPv6 on all interfaces.\n";
		system "ip6 -a";
	}
	else {
		print "Starting IPv6 on $ARGV[1].\n";
		system "ip6 -u $ARGV[1]";
	}
}

# Stop IPv6
elsif ($ARGV[0] eq "stop-v6" or $ARGV[0] eq "v6-stop") {
	if ($ARGV[1] eq "all") {
		print "Stopping IPv6 on all interfaces.\n";
		system "ip6 -x";
	}
	else {
		print "Stopping IPv6 on $ARGV[1].\n";
		system "ip6 -d $ARGV[1]";
	}
}

# Start 6to4
elsif ($ARGV[0] eq "start-stf" or $ARGV[0] eq "stf-start") {
	do_6to4_setup;
	print "Starting 6to4 on $ARGV[1].\n";
	system "ifconfig stf0 inet6 $localadr6:$hostbits6 prefixlen $v6_prefixlen alias";
	system "route add -inet6 default $remoteadr6";
	if ($in_if ne "") {
	    system "ifconfig $in_if inet6 $prefix:$v6_innernet:$hostbits6";
	}
}

# Stop 6to4
elsif ($ARGV[0] eq "stop-stf" or $ARGV[0] eq "stf-stop") {
	print "Stopping 6to4.\n";
	system "ifconfig stf0 down";
	$cmd="ifconfig stf0 inet6 " .
	     "| grep inet6 " .
	     "| sed -e 's/inet6//' " .
		   "-e 's/prefix.*//g' " .
		   "-e 's/^[ 	]*//' " .
		   "-e 's/[ 	]*\$//'";
	foreach $ip ( split('\s+', `$cmd`)) {
		system "ifconfig stf0 inet6 -alias $ip";
	}
	system "route delete -inet6 default";
}

# Start router advertisement
elsif ($ARGV[0] eq "rtadvd-start" or $ARGV[0] eq "start-rtadvd") {
	print "WARNING: Setting up router advertisement should be done with great care\n";
	print "because of a number of security issues. You should make sure this is\n";
	print "allowed on your network and possibly fine-tune rtadvd.conf.\n";
	print "\n";
	print "Are you sure you want to start router advertisement (yes/no) ?: ";
	while (<STDIN>) {
		chomp;
		if ($_ eq "yes" or $_ eq "y") {
			if ( -f "/var/run/rtadvd.pid" ) {
				print "rtadvd already running!\n";
			} else {
				print "Starting router advertisement.\n";
				system "sysctl -w net.inet6.ip6.forwarding=1";
				system "sysctl -w net.inet6.ip6.accept_rtadv=0";
				shift @ARGV;
				system "rtadvd @ARGV";
			}
			last;
		}
		elsif ($_ eq "no" or $_ eq "n") {
			print "Router advertisement startup aborted.\n";
			last;
		}
		else {
			print "Invalid entry! Try again.\n";
			print "Are you sure you want to start router advertisement? (yes/no): ";
		}
	}
}

# Stop router advertisement
elsif ($ARGV[0] eq "rtadvd-stop" or $ARGV[0] eq "stop-rtadvd") {
    if ( -f "/var/run/rtadvd.pid" ) {
		print "Stopping router advertisement.\n";
		$pid = `cat /var/run/rtadvd.pid`;
		system "kill -TERM $pid";
		system "rm -f /var/run/rtadvd.pid";
		system "rm -f /var/run/6to4-rtadvd.conf.$pid";
    } else {
		print "no rtadvd running!\n";
    }
}
else {
	do_usage;
}