#!/bin/sh
#
# (C) Copyright 1995-1999  Mike Jagdis <jaggy@purplet.demon.co.uk>
#
#
# Configure the ippp interfaces according to the descriptions
# in the configuration file.
#
# This script would normally be installed as /etc/rc.ippp,
# /etc/init.d/ippp, /etc/rc[1-5].d/SXXippp or similar
# depending on your system religion.
#
# The assumption is that dialds are to be used to manage the ippp
# interfaces. If not the ippp interfaces should be reconfigured
# afterwards as necessary.
#
# This should run before dialds are started and before any attempt
# is made to reconfigure ippp interfaces differently.


# CONFIGURABLE STUFF

export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin

config_file=/etc/ippp.conf

# END OF CONFIGURABLE STUFF


action="$1"
shift
links="$*"


if [ -n "$BASH_VERSION" ]; then
	enable echo
	enable kill
	use_escapes='-e'
else
	use_escapes=''
fi


start_ipppd()
{
	link="$1"
	eazmsn="$2"
	shift; shift

	echo $use_escapes " $link\c"

	if [ "$eazmsn" = '-' ]; then
		eazmsn=
	fi

	ports=
	while [ -n "$1" ]; do
		case "$1" in
		ippp*)
			ports="$ports /dev/$1"

			# Set up this interface for syncPPP over HDLC.
			# Disable the hangup timeout because diald should be
			# managing that. (Actually I set 300 seconds just
			# in case diald dies with the link up...)
			( isdnctrl delif "$1"; \
			  isdnctrl addif "$1"; \
			  isdnctrl encap "$1" syncppp; \
			  isdnctrl l2_prot "$1" hdlc; \
			  isdnctrl huptimeout "$1" 300; \
			  isdnctrl eaz "$1" "$eazmsn"; \
			  isdnctrl status "$1" on; \
			) > /dev/null 2>&1

			# Explicitly bind the interface to the matching
			# syncPPP manager channel. This is essential if
			# any PPP options are specified. It is arguably
			# convenient when no options are supplied and a
			# single ipppd manages several links too.
			unit=`echo "$1" | cut -c5-`
			if [ -n "$unit" ]; then
				isdnctrl pppbind "$1" "$unit" >/dev/null 2>&1
			fi

			if [ -n "$eazmsn" ]; then
				# This interface is available for incoming
				# connections.
				ifconfig "$p" 0.0.0.0 \
					pointopoint 0.0.0.0 \
					netmask 255.255.255.255 \
					up > /dev/null 2>&1
			fi
			;;
		*)
			break
			;;
		esac
		shift
	done

	pppopts="$*"

	# Diald will add host routes as appropriate. If we
	# let ipppd do it diald may never notice the link
	# come up as a result of an incoming connection
	# where all the traffic is to/from the local
	# system. i.e. our reply must go out via the
	# diald slip proxy.
	ipppd $ports -hostroute $pppopts pidfile "/var/run/ipppd.$link"
}


case "${action}" in
	start)
		# Set up ippp interfaces. If a configuration file
		# exists we read the details and apply them.
		if [ -f "$config_file" ]; then
			# Try and load compression modules before doing
			# anything that might load SLIP/PPP modules.
			modprobe bsd_comp ppp_deflate > /dev/null 2>&1

			echo $use_escapes "Configuring ippp interfaces:\c"
			while read key args; do
				# Ignore blank lines and comments.
				case "$key" in
					'#'*|'')
						continue ;;
				esac

				if [ -z "$links" ]; then
					start_ipppd "$key" $args
				else
					for i in $links; do
						if [ "$key" = "$i" ]; then
							start_ipppd "$key" $args
							break
						fi
					done
				fi
			done < "$config_file"

			echo
		fi
		;;

	stop)
		if [ -z "$links" ]; then
			pids=`cat /var/run/ipppd.* 2> /dev/null`
		else
			pids=`for key in $links; do
				cat "/var/run/ipppd.$key"
			done 2> /dev/null`
		fi

		if [ -z "$pids" ]; then
			echo "No ippp interfaces to stop"
			exit 0
		fi

		kill $pids > /dev/null 2>&1
		sleep 1
		for retry in 1 2 3; do
			if kill $pids > /dev/null 2>&1; then
				: some still exist
				sleep 2
			else
				echo "ippp interfaces stopped"
				break
			fi
		done
		;;

	*)	echo "usage: ippp start|stop [link ...]"
		exit 1
		;;
esac