#!/bin/sh /etc/rc.common
# Copyright (C) 2008  Alina Friedrichsen <x-alina@gmx.net>
# Special thanks to bittorf wireless ))
START=50

BIN=/usr/sbin/olsrd
CONF=/var/etc/olsrd.conf
PID=/var/run/olsrd.pid

OLSRD_OLSRD_SCHEMA='ignore:internal config_file:internal DebugLevel=0 IpVersion=4 AllowNoInt:bool=1 Pollrate=0.025 TcRedundancy=2 MprCoverage=3 LinkQualityFishEye=1 LinkQualityDijkstraLimit=0+9.0 FIBMetric=flat ClearScreen:bool=1 Willingness=3 LinkQualityAging=0.1 LinkQualityAlgorithm=etx_fpm MinTCVTime=500.0'
OLSRD_IPCCONNECT_SCHEMA='ignore:internal Host:list Net:list2'
OLSRD_LOADPLUGIN_SCHEMA='ignore:internal library:internal Host:list Net:list2 Ping:list redistribute:list NonOlsrIf:list name:list lat lon latlon_infile HNA:list2 hosts:list2'
OLSRD_INTERFACE_SCHEMA='ignore:internal interface:internal AutoDetectChanges:bool Ip4Broadcast HelloInterval=5.0 HelloValidityTime=40.0 TcInterval=2.0 TcValidityTime=256.0 MidInterval=18.0 MidValidityTime=324.0 HnaInterval=18.0 HnaValidityTime=108.0'

T='	'
N='
'

validate_varname() {
	local varname=$1
	[ -z "$varname" -o "$varname" != "${varname%%[!A-Za-z0-9_]*}" ] && return 1
	return 0
}

validate_ifname() {
	local ifname=$1
	[ -z "$ifname" -o "$ifname" != "${ifname%%[!A-Za-z0-9.:_-]*}" ] && return 1
	return 0
}

validate_olsrd_option() {
	local str=$1
	[ -z "$str" -o "$str" != "${str%%[! 	0-9A-Za-z./:_-]*}" ] && return 1
	return 0
}

get_ifname() {
	IFNAME=
	local interface=$1
	validate_varname "$interface" || return 1
	local ifname

	config_get ifname "$interface" ifname
	validate_ifname "$ifname" || return 1
	IFNAME=$ifname

	return 0
}

system_config() {
	local cfg=$1
	local cfgt
	local hostname
	local latlon

	config_get cfgt "$cfg" TYPE

	if [ "$cfgt" = "system" ]; then
		config_get hostname "$cfg" hostname
		hostname=${hostname:-OpenWrt}
		SYSTEM_HOSTNAME=$hostname
	fi

	if [ -z "$SYSTEM_LAT" -o -z "$SYSTEM_LON" ]; then
		config_get latlon "$cfg" latlon
		IFS=" ${T}${N},"
		set -- $latlon
		unset IFS
		SYSTEM_LAT=$1
		SYSTEM_LON=$2
	fi
}

olsrd_find_config_file() {
	local cfg=$1
	validate_varname "$cfg" || return 0

	config_get_bool ignore "$cfg" ignore 0
	[ "$ignore" -ne 0 ] && return 0
	config_get OLSRD_CONFIG_FILE "$cfg" config_file

	return 0
}

warning_invalid_value() {
	local package=$1
	validate_varname "$package" || package=
	local config=$2
	validate_varname "$config" || config=
	local option=$3
	validate_varname "$option" || option=

	echo -n "Warning: Invalid value" 1>&2

	if [ -n "$package" -a -n "$config" ]; then
		echo -n " in option '$package.$config${option:+.}$option'" 1>&2
	fi

	echo ", skipped" 1>&2

	return 0
}

olsrd_write_option() {
	local param=$1
	local cfg=$2
	validate_varname "$cfg" || return 1
	local option=$3
	validate_varname "$option" || return 1
	local value=$4
	local option_type=$5

	if [ "$option_type" = bool ]; then
		case "$value" in
			1|on|true|enabled|yes) value=yes;;
			0|off|false|disabled|no) value=no;;
			*) warning_invalid_value olsrd "$cfg" "$option"; return 1;;
		esac
	fi

	if ! validate_olsrd_option "$value"; then
		warning_invalid_value olsrd "$cfg" "$option"
		return 1
	fi

	if [ "$value" != "${value%%[G-Zg-z_-]*}" ]; then
		if [ "$option" != "Ip6AddrType" -a "$value" != "yes" -a "$value" != "no" ]; then
			value="\"$value\""
		fi
	fi

	echo -n "${N}$param$option $value"

	return 0
}

olsrd_write_plparam() {
	local param=$1
	local cfg=$2
	validate_varname "$cfg" || return 1
	local option=$3
	validate_varname "$option" || return 1
	local value=$4
	local option_type=$5
	local _option

	if [ "$option_type" = bool ]; then
		case "$value" in
			1|on|true|enabled|yes) value=yes;;
			0|off|false|disabled|no) value=no;;
			*) warning_invalid_value olsrd "$cfg" "$option"; return 1;;
		esac
	fi

	if ! validate_olsrd_option "$value"; then
		warning_invalid_value olsrd "$cfg" "$option"
		return 1
	fi

	IFS='-_'
	set -- $option
	option="$*"
	unset IFS
	_option="$option"
	if [ "$option" = 'hosts' ]; then
		set -- $value
		option=$1
		shift
		value="$*"
	fi

	echo -n "${N}${param}PlParam \"$option\" \"$value\""

	return 0
}

config_update_schema() {
	unset IFS
	local schema_varname=$1
	validate_varname "$schema_varname" || return 1
	local command=$2
	validate_varname "$command" || return 1
	local option=$3
	validate_varname "$option" || return 1
	local value=$4
	local schema
	local cur_option

	case "$varname" in
		*_LENGTH) return 0;;
		*_ITEM*) return 0;;
	esac

	eval "export -n -- \"schema=\${$schema_varname}\""

	for cur_option in $schema; do
		[ "${cur_option%%[:=]*}" = "$option" ] && return 0
	done

	if [ "$command" = list ]; then
		set -- $value
		if [ "$#" -ge "3" ]; then
			schema_entry="$option:list3"
		elif [ "$#" -ge "2" ]; then
			schema_entry="$option:list2"
		else
			schema_entry="$option:list"
		fi
	else
		schema_entry="$option"
	fi

	append "$schema_varname" "$schema_entry"

	return 0
}

config_write_options() {
	unset IFS
	local schema=$1
	local cfg=$2
	validate_varname "$cfg" || return 1
	local write_func=$3
	[ -z "$write_func" ] && output_func=echo
	local write_param=$4
	local schema_entry
	local option
	local option_length
	local option_type
	local default
	local value
	local list_size
	local list_item
	local list_value
	local i
	local position

	for schema_entry in $schema; do
		default=${schema_entry#*[=]}
		[ "$default" = "$schema_entry" ] && default=
		option=${schema_entry%%[=]*}
		IFS=':'
		set -- $option
		unset IFS
		option=$1
		option_type=$2
		validate_varname "$option" || continue
		[ -z "$option_type" ] || validate_varname "$option_type" || continue
		[ "$option_type" = internal ] && continue
		config_get value "$cfg" "$option"

		if [ -z "$value" ]; then
			IFS='+'
			set -- $default
			unset IFS
			value=$*
		elif [ "$value" = '-' -a -n "$default" ]; then
			continue
		fi

		[ -z "$value" ] && continue

		case "$option_type" in
			list) list_size=1;;
			list2) list_size=2;;
			list3) list_size=3;;
			*) list_size=0;;
		esac

		if [ "$list_size" -gt 0 ]; then
			config_get option_length "$cfg" "${option}_LENGTH"
			if [ -n "$option_length" ]; then
				i=1
				while [ "$i" -le "$option_length" ]; do
					config_get list_value "$cfg" "${option}_ITEM$i"
					"$write_func" "$write_param" "$cfg" "$option" "$list_value" "$option_type" || break
					i=$((i + 1))
				done
			else
				list_value=
				i=0
				for list_item in $value; do
					append "list_value" "$list_item"
					i=$((i + 1))
					position=$((i % list_size))
					if [ "$position" -eq 0 ]; then
						"$write_func" "$write_param" "$cfg" "$option" "$list_value" "$option_type" || break
						list_value=
					fi
				done
				[ "$position" -ne 0 ] && "$write_func" "$write_param" "$cfg" "$option" "$list_value" "$option_type"
			fi
		else
			"$write_func" "$write_param" "$cfg" "$option" "$value" "$option_type"
		fi
	done

	return 0
}

olsrd_write_olsrd() {
	local cfg=$1
	validate_varname "$cfg" || return 0
	local ignore

	config_get_bool ignore "$cfg" ignore 0
	[ "$ignore" -ne 0 ] && return 0

	[ "$OLSRD_COUNT" -gt 0 ] && return 0

	config_write_options "$OLSRD_OLSRD_SCHEMA" "$cfg" olsrd_write_option
	echo
	OLSRD_COUNT=$((OLSRD_COUNT + 1))

	return 0
}

olsrd_write_ipcconnect() {
	local cfg=$1
	validate_varname "$cfg" || return 0
	local ignore

	config_get_bool ignore "$cfg" ignore 0
	[ "$ignore" -ne 0 ] && return 0

	[ "$IPCCONNECT_COUNT" -gt 0 ] && return 0

	echo -n "${N}IpcConnect${N}{"
	config_write_options "$OLSRD_IPCCONNECT_SCHEMA" "$cfg" olsrd_write_option "${T}"
	echo "${N}}"
	IPCCONNECT_COUNT=$((IPCCONNECT_COUNT + 1))

	return 0
}

olsrd_write_hna4() {
	local cfg=$1
	validate_varname "$cfg" || return 0
	local ignore

	config_get_bool ignore "$cfg" ignore 0
	[ "$ignore" -ne 0 ] && return 0

	config_get netaddr "$cfg" netaddr
	if ! validate_olsrd_option "$netaddr"; then
		warning_invalid_value olsrd "$cfg" "netaddr"
		return 0
	fi

	config_get netmask "$cfg" netmask
	if ! validate_olsrd_option "$netmask"; then
		warning_invalid_value olsrd "$cfg" "netmask"
		return 0
	fi

	[ "$HNA4_COUNT" -le 0 ] && echo -n "${N}Hna4${N}{"
	echo -n "${N}${T}$netaddr $netmask"
	HNA4_COUNT=$((HNA4_COUNT + 1))

	return 0
}

olsrd_write_hna6() {
	local cfg=$1
	validate_varname "$cfg" || return 0
	local ignore

	config_get_bool ignore "$cfg" ignore 0
	[ "$ignore" -ne 0 ] && return 0

	config_get netaddr "$cfg" netaddr
	if ! validate_olsrd_option "$netaddr"; then
		warning_invalid_value olsrd "$cfg" "netaddr"
		return 0
	fi

	config_get prefix "$cfg" prefix
	if ! validate_olsrd_option "$prefix"; then
		warning_invalid_value olsrd "$cfg" "prefix"
		return 0
	fi

	[ "$HNA6_COUNT" -le 0 ] && echo -n "${N}Hna6${N}{"
	echo -n "${N}${T}$netaddr $prefix"
	HNA6_COUNT=$((HNA6_COUNT + 1))

	return 0
}

olsrd_write_loadplugin() {
	local cfg=$1
	validate_varname "$cfg" || return 0
	local ignore
	local name
	local suffix
	local lat
	local lon
	local latlon_infile

	config_get_bool ignore "$cfg" ignore 0
	[ "$ignore" -ne 0 ] && return 0

	config_get library "$cfg" library
	if ! validate_olsrd_option "$library"; then
		warning_invalid_value olsrd "$cfg" "library"
		return 0
	fi
	if ! [ -x "/lib/$library" -o -x "/usr/lib/$library" -o -x "/usr/local/lib/$library" ]; then
		echo "Warning: Plugin library '$library' not found, skipped" 1>&2
		return 0
	fi

	case "$library" in
		olsrd_nameservice.*)
			config_get name "$cfg" name
			[ -z "$name" ] && config_set "$cfg" name $SYSTEM_HOSTNAME

			config_get suffix "$cfg" suffix
			[ -z "$suffix" ] && config_set "$cfg" suffix '.olsr'

			config_get lat "$cfg" lat
			config_get lon "$cfg" lon
			config_get latlon_infile "$cfg" latlon_infile
			if [ \( -z "$lat" -o -z "$lat" \) -a -z "$latlon_infile" ]; then
				if [ -f '/var/run/latlon.txt' ]; then
					config_set "$cfg" lat ''
					config_set "$cfg" lon ''
					config_set "$cfg" latlon_infile '/var/run/latlon.txt'
				else
					config_set "$cfg" lat "$SYSTEM_LAT"
					config_set "$cfg" lon "$SYSTEM_LON"
				fi
			fi

			config_get latlon_file "$cfg" latlon_file
		;;
	esac

	echo -n "${N}LoadPlugin \"$library\"${N}{"
	config_write_options "$OLSRD_LOADPLUGIN_SCHEMA" "$cfg" olsrd_write_plparam "${T}"
	echo "${N}}"

	return 0
}

olsrd_write_interface() {
	local cfg=$1
	validate_varname "$cfg" || return 0
	local ignore
	local interfaces
	local interface
	local ifnames

	config_get_bool ignore "$cfg" ignore 0
	[ "$ignore" -ne 0 ] && return 0

	ifnames=
	config_get interfaces "$cfg" interface
	for interface in $interfaces; do
		if validate_varname "$interface"; then
			if get_ifname "$interface"; then
				ifnames="$ifnames \"$IFNAME\""
			else
				echo "Warning: Interface '$interface' not found, skipped" 1>&2
			fi
		else
			warning_invalid_value olsrd "$cfg" "interface"
		fi
	done

	[ -z "$ifnames" ] && return 0

	echo -n "${N}Interface$ifnames${N}{"
	config_write_options "$OLSRD_INTERFACE_SCHEMA" "$cfg" olsrd_write_option "${T}"
	echo "${N}}"
	INTERFACES_COUNT=$((INTERFACES_COUNT + 1))

	return 0
}

olsrd_update_schema() {
	local command="$1"
	validate_varname "$command" || return 0
	local varname="$2"
	validate_varname "$varname" || return 0
	local value="$3"
	local cfg="$CONFIG_SECTION"
	local cfgt
	local cur_varname

	config_get cfgt "$cfg" TYPE
	case "$cfgt" in
		olsrd) config_update_schema OLSRD_OLSRD_SCHEMA "$command" "$varname" "$value";;
		IpcConnect) config_update_schema OLSRD_IPCCONNECT_SCHEMA "$command" "$varname" "$value";;
		LoadPlugin) config_update_schema OLSRD_LOADPLUGIN_SCHEMA "$command" "$varname" "$value";;
		Interface) config_update_schema OLSRD_INTERFACE_SCHEMA "$command" "$varname" "$value";;
	esac

	return 0
}

olsrd_write_config() {
	OLSRD_COUNT=0
	config_foreach olsrd_write_olsrd olsrd
	IPCCONNECT_COUNT=0
	config_foreach olsrd_write_ipcconnect IpcConnect
	HNA4_COUNT=0
	config_foreach olsrd_write_hna4 Hna4
	[ "$HNA4_COUNT" -gt 0 ] && echo "${N}}"
	HNA6_COUNT=0
	config_foreach olsrd_write_hna6 Hna6
	[ "$HNA6_COUNT" -gt 0 ] && echo "${N}}"
	config_foreach olsrd_write_loadplugin LoadPlugin
	INTERFACES_COUNT=0
	config_foreach olsrd_write_interface Interface
	echo

	return 0
}

start() {
	### check for running instance
	if [ -s $PID ]; then
		if kill -0 $(cat $PID) 2>&-; then
			echo "there is already a running instance ($(cat $PID))"
			return 1
		fi
	fi

	### disable icmp redirects
	echo 0 > /proc/sys/net/ipv4/conf/all/send_redirects

	SYSTEM_HOSTNAME=
	SYSTEM_LAT=
	SYSTEM_LON=
	config_load system
	config_foreach system_config system

	option_cb() {
		olsrd_update_schema "option" "$@"
	}

	list_cb() {
		olsrd_update_schema "list" "$@"
	}

	include /lib/network
	scan_interfaces
	config_load olsrd
	reset_cb

	OLSRD_CONFIG_FILE=
	config_foreach olsrd_find_config_file olsrd

	if [ -z "$OLSRD_CONFIG_FILE" ]; then
		### generate config
		mkdir -p ${CONF%/*}
		olsrd_write_config > $CONF
		if [ "$INTERFACES_COUNT" -gt 0 -a "$OLSRD_COUNT" -gt 0 ]; then
			OLSRD_CONFIG_FILE=$CONF
		fi
	fi

	[ -z "$OLSRD_CONFIG_FILE" ] && return 1

	### start olsrd
	start-stop-daemon -q -b -m -p $PID -x $BIN -S -- -f $CONF -nofork
}

stop() {
	### stop olsrd
	start-stop-daemon -q -p $PID -x $BIN -K

	### re-enable icmp redirects
	echo 1 > /proc/sys/net/ipv4/conf/all/send_redirects
}

restart() {
	### override generic restart because we need some time between stop and start
	stop; sleep 3; start
}