#!/bin/sh
# Copyright (C) 2006 OpenWrt.org

alias debug=${DEBUG:-:}

# newline
N="
"

_C=0

# valid interface?
if_valid () (
  ifconfig "$1" >&- 2>&- ||
  [ "${1%%[0-9]}" = "br" ] ||
  { debug "# missing interface '$1' ignored"; false; }
)

hotplug_dev() {
	env -i ACTION=$1 INTERFACE=$2 /sbin/hotplug net
}

append() {
	local var="$1"
	local value="$2"
	local sep="${3:- }"
	eval "export ${var}=\"\${${var}:+\${${var}}${value:+$sep}}$value\""
}

reset_cb() {
	config_cb() {
		return 0
	}
	option_cb() {
		return 0
	}
}
reset_cb

config () {
	_C=$(($_C + 1))
	name="${name:-cfg${_C}}"
	config_cb "$1" "$2"
	export CONFIG_SECTION="$2"
	export CONFIG_${CONFIG_SECTION}_TYPE="$1"
}

option () {
	local varname="$1" ; shift
	export CONFIG_${CONFIG_SECTION}_${varname}="$*"
	option_cb "$varname" "$*"
}

config_clear() {
	[ -z "$CONFIG_SECTION" ] && return
	for oldsetting in `set | grep ^CONFIG_${CONFIG_SECTION}_ | \
		sed -e 's/\(.*\)=.*$/\1/'` ; do 
		unset $oldsetting 
	done
	unset CONFIG_SECTION
}

config_load() {
	local DIR="./"
	_C=0
	[ \! -e "$1" -a -e "/etc/config/$1" ] && {
		DIR="/etc/config/"
	}
	[ -e "$DIR$1" ] && {
		CONFIG_FILENAME="$DIR$1"
		. ${CONFIG_FILENAME}
	} || return 1
	${CD:+cd -} >/dev/null
	${CONFIG_SECTION:+config_cb}
}

config_get() {
	case "$3" in
		"") eval "echo \${CONFIG_${1}_${2}}";;
		*) eval "$1=\"\${CONFIG_${2}_${3}}\"";;
	esac
}

config_set() {
	export CONFIG_${1}_${2}="${3}"
}

load_modules() {
	sed 's/^[^#]/insmod &/' $* | ash 2>&- || :
}

find_part() {
	PART="$(grep "\"$1\"" /proc/mtd | awk -F: '{print $1}')"
	PART="${PART##mtd}"
	echo "${PART:+/dev/mtdblock/$PART}"
}

get_serial() {
	dd if=$(find_part board_config) bs=$((0x88)) skip=1 count=1 2>/dev/null | head -c10
}

enabled() {
	case "$1" in
		1|on|enabled) return 0;;
		0|off|disabled) return 1;;
		*)
			case "$2" in
				0|off|disabled) return 1;;
				*) return 0;;
			esac
		;;
	esac
}

#
# This functions forwards a port. The next args are required:
# $1 = WAN interface
# $2 = Origin Port
# $3 = Destination IP
# $4 = Destination Port
# $5 = protocol used
#
# Example: open_port $WAN 8080 192.168.1.2 80 tcp
#
open_port() {
        iptables -t nat -A prerouting_rule -i $1 -p $5 --dport $2 -j DNAT --to-destination $3:$4
        pdots=`echo $4 | sed 's/-/:/g'`
        iptables        -A forwarding_rule -i $1 -p $5 --dport $pdots -d $3 -j ACCEPT
}