#!/bin/sh
#
# $NetBSD: ipsec,v 1.18 2020/09/08 12:52:18 martin Exp $
#

# PROVIDE: ipsec
# REQUIRE: root bootconf CRITLOCALMOUNTED tty
# BEFORE:  DAEMON

$_rc_subr_loaded . /etc/rc.subr

name="ipsec"
rcvar=$name
start_precmd="ipsec_prestart"
start_cmd="ipsec_start"
stop_precmd="test -f /etc/ipsec.conf"
stop_cmd="ipsec_stop"
reload_cmd="ipsec_reload"
extra_commands="reload"

ipsec_prestart()
{
	if [ ! -f /etc/ipsec.conf ]; then
		warn "/etc/ipsec.conf not readable; ipsec start aborted."

		stop_boot
		return 1
	fi
	return 0
}

ipsec_getip() {
	ifconfig $1 | while IFS="${IFS}/" read what address rest; do
		case "$what" in
		inet)	echo "local v4_addr=$address;";;
		inet6)	case "$address" in
			fe80:*)	;;
			*)	echo "local v6_addr=$address;";;
			esac;;
		esac
	done
}

ipsec_load() {
	if [ -z "$1" ]; then
		/sbin/setkey -f /etc/ipsec.conf
	else
		sed	-e "s/@LOCAL_ADDR@/$1/" \
			-e "s/@LOCAL_ADDR_V4@/$1/" \
			-e "s/@LOCAL_ADDR_V6@/$2/" /etc/ipsec.conf | \
		    /sbin/setkey -f -
	fi
}

ipsec_configure() {
	while true; do
		eval $(ipsec_getip "$ipsec_flags")
		case "$v4_addr" in
		'')		sleep 1;;
		"0.0.0.0")	sleep 1;;
		*)		ipsec_load "$v4_addr" "$v6_addr"; return;;
		esac
	done &
}

ipsec_start()
{
	echo "Installing ipsec manual keys/policies."
	if [ -n "$ipsec_flags" ]; then
		ipsec_configure
	else
		ipsec_load
	fi
}

ipsec_stop()
{
	echo "Clearing ipsec manual keys/policies."

	# still not 100% sure if we would like to do this.
	# it is very questionable to do this during shutdown session, since
	# it can hang any of remaining IPv4/v6 session.
	#
	/sbin/setkey -F
	/sbin/setkey -FP
}

ipsec_reload()
{
	echo "Reloading ipsec manual keys/policies."
	ipsec_stop
	ipsec_start
}

load_rc_config $name
run_rc_command "$1"