#!/bin/sh

# script for udhcpc
# Copyright (c) 2008 Natanael Copa <natanael.copa@gmail.com>

UDHCPC="/etc/udhcpc"
UDHCPC_CONF="$UDHCPC/udhcpc.conf"

RESOLV_CONF="/etc/resolv.conf"
[ -f $UDHCPC_CONF ] && . $UDHCPC_CONF

export broadcast
export dns
export domain
export interface
export ip
export mask
export metric
export router
export subnet

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

run_scripts() {
	local dir=$1
	if [ -d $dir ]; then
		for i in $dir/*; do
			[ -f $i ] && $i
		done
	fi
}

deconfig() {
	ip addr flush dev $interface
}

routes() {
	[ -z "$router" ] && return
	local gw metric
	while ip route del default via dev $interface 2>/dev/null; do
		:
	done
	metric=0
	for gw in $router; do
		route add default gw $gw dev $interface metric $metric
		metric=$(( $metric + 1 ))
	done
}

resolvconf() {
	local i
	if [ "$RESOLV_CONF" = "no" ] || [ "$RESOLV_CONF" = "NO" ] \
			|| [ -z "$RESOLV_CONF" ]; then
		return
	fi
	echo -n > "$RESOLV_CONF"
	[ -n "$domain" ] && echo "search $domain" >> "$RESOLV_CONF"
	for i in $dns; do
		echo "nameserver $i" >> "$RESOLV_CONF"
	done
}

bound() {
	ip addr add $ip/$mask dev $interface
	ip link set dev $interface up
	routes
	resolvconf
}

renew() {
	if ! ip addr show dev $interface | grep $ip/$mask; then
		ip addr flush dev $interface
		ip addr add $ip/$mask dev $interface
	fi

	local i
	for i in $router; do
		if ! ip route show | grep ^default | grep $i; then
			routes
			break
		fi
	done

	if ! grep "^search $domain"; then
		resolvconf
		return
	fi
	for i in $dns; do
		if ! grep "^nameserver $i"; then
			resolvconf
			return
		fi
	done
}

case "$1" in
	deconfig|renew|bound)
		run_scripts $UDHCPC/pre-$1
		$1
		run_scripts $UDHCPC/post-$1
		;;
	*)
		echo "Error: this script should be called from udhcpc" >&2
		exit 1
		;;
esac
exit 0