#!/bin/bash
#
# ip-up.ipv6to4
#
#
# Taken from:
# (P) & (C) 2000-2001 by Peter Bieringer <pb@bieringer.de>
#  
# Version 2001-07-15a
#
# Calling parameters:
#  $1: interface name
#
# Called by (mostly) /etc/ppp/ip-up.local
#  like: /etc/ppp/ip-up.ipv6to4 $1 >>/var/log/ppp-ipv6to4.log 2>&1
#
# Uses following information from /etc/sysconfig/network:
#  NETWORKING_IPV6=yes|no: controls IPv6 initialization (global setting)
#
# Uses following information from /etc/sysconfig/network-scripts/ifcfg-$1:
#  IPV6TO4INIT=yes|no: controls configuration
#  IPV6TO4_IPV4ADDR=IPv4addr: special local address for 6to4 tunneling (only needed behind a NAT gateway)
#  IPV6TO4_RELAY=IPv4addr: remote IPv6to4 relay address
#  IPV6TO4_ROUTING="eth0-:f101::0/64 eth1-:f102::0/64": information to setup local subnetting
#  IPV6TO4_CONTROL_RADVD=yes|no: controls radvd triggering
#  IPV6TO4_RADVD_PIDFILE=file: PID file of radvd for sending signals, default is "/var/run/radvd/radvd.pid"
#
# Requirements
#  radvd-0.6.2p3 or newer supporting option "Base6to4Interface"
#


if [ -z "$1" ]; then
	echo $"Option 1 is empty but should contain interface name - skip IPv6to4 initialization" >/dev/stderr
	exit 1
fi

# Get global network configuration
. /etc/sysconfig/network

# Source IPv4 helper functions
cd /etc/sysconfig/network-scripts
. network-functions

CONFIG=$1
[ -f "$CONFIG" ] || CONFIG=ifcfg-$CONFIG
source_config

# Test whether IPv6 should be configured, else stop
[ "${NETWORKING_IPV6}" = "yes" ] || exit 0

if [ ! -f /etc/sysconfig/network-scripts/network-functions-ipv6 ]; then 
        exit 1 
fi 

. /etc/sysconfig/network-scripts/network-functions-ipv6

# Run basic IPv6 test (and make sure the ipv6 module will be loaded), if not ok, skip IPv6 initialization
test_ipv6 || exit 1


# Setup of 6to4, if configured
valid6to4config="yes"
if [ "$IPV6TO4INIT" = "yes" ]; then
	if [ ! -z "$IPV6TO4_IPV4ADDR" ]; then
		# Take special configured from config file (precedence 1)
		ipv4addr="$IPV6TO4_IPV4ADDR"
        else
		# Get IPv4 address from interface first (has precedence 2)
		ipv4addr="`LC_ALL=C ifconfig $DEVICE |grep "inet addr:" | tr : " " | awk '{ print $3 }'`"
		if [ -z "$ipv4addr" ]; then
                	# Take configured from config file (precedence 3)
                	ipv4addr="$IPADDR"
            	fi
        fi
        if [ ! -z "$ipv4addr" ]; then
		# Test for non-global IPv4 address
		if ! testipv4_globalusable $ipv4addr; then
                	echo $"Given IPv4 address $ipv4addr is not a globally usable one, 6to4 configuration is not valid!"
			valid6to4config="no"
		fi
		if [ -z "$IPV6TO4_RELAY" ]; then
			echo $"IPv6to4 configuration needs an IPv6to4 relay address, 6to4 configuration is not valid!"
			valid6to4config="no"
        	fi
	else
		echo $"IPv6to4 configuration needs an IPv4 address on related interface or extra specified, 6to4 configuration is not valid!"
		valid6to4config="no"
	fi
	if [ "$valid6to4config" = "yes" ]; then
		# Beep 
		if [ -x /usr/bin/beep ]; then /usr/bin/beep -f 2000; else echo -en "\a" >/dev/console; fi

		# Cleanup all old data (needed, if "ip-down.ipv6to4" wasn't executed)

	        # Delete all static IPv6to4 routes to relay
	        ifdown_ipv6_route_all sit0 ::$IPV6TO4_RELAY

		# Delete routes to local networks
        	for devsuf in $IPV6TO4_ROUTING; do
            		dev="`echo $devsuf | awk -F- '{ print $1 }'`"
			ifdown_ipv6_route_all $dev ::
		done

        	# Delete all configured 6to4 address
	        ifdown_ipv6to4_all sit0
 
		# Setup new data
		ifup_ipv6to4 $DEVICE $ipv4addr || exit 1
	
		if [ -f /etc/sysconfig/static-routes-ipv6 ]; then
			grep -w "^sit0" /etc/sysconfig/static-routes-ipv6 | while read device args; do
				ifup_ipv6_route $args ::$IPV6TO4_RELAY sit0
			done
		fi

	        if [ "$IPV6TO4_CONTROL_RADVD" = "yes" ]; then
			if [ -z "$IPV6TO4_RADVD_PIDFILE" ]; then
				# Take default
				IPV6TO4_RADVD_PIDFILE="/var/run/radvd/radvd.pid"
			fi

			if [ -f "$IPV6TO4_RADVD_PIDFILE" ]; then
				pid="`cat $IPV6TO4_RADVD_PIDFILE`"
				if [ ! -z "$pid" ]; then
					echo $"Trigger RADVD for IPv6to4 prefix recalculation"	
					kill -HUP $pid
				else
					false
				fi
			fi
		        if [ ! -z "$IPV6TO4_ROUTING" ]; then
				# Generate 6to4 address
				ipv6to4prefix="`create6to4prefix $ipv4addr`"
				if [ ! -z "$ipv6to4prefix" ]; then
					# Add route to local networks
					for devsuf in $IPV6TO4_ROUTING; do
						dev="`echo $devsuf | awk -F- '{ print $1 }'`"
						suf="`echo $devsuf | awk -F- '{ print $2 }'`"
						ifup_ipv6_route ${ipv6to4prefix}$suf :: $dev
					done
				else
					echo $"Error occured while calculating the IPv6to4 prefix"
				fi
			else
				echo $"RADVD control enabled, but config is not complete!"
			fi
		fi

		# Beep 
		if [ -x /usr/bin/beep ]; then /usr/bin/beep -f 2666; else echo -en "\a" >/dev/console; fi
	fi
fi