#!/bin/sh /etc/rc.common
START=91
STOP=10

EXTRA_COMMANDS="show"
EXTRA_HELP="	show	Show current configuration of tgtd"

NAME=tgt
PROG=/usr/sbin/tgtd
USE_PROCD=1

tgtadm="/usr/sbin/tgtadm --lld iscsi"

handle_lun() {
	local tgt_lun=$1
	local tgtid=$2
	local ro device type bstype sync direct
	local my_tgtid=${tgt_lun%_*}
	local lun=${tgt_lun#*_}
	[ $my_tgtid -eq $tgtid ] || return 0

	config_get device $1 device ""
	[ "$device" ] || return 1

	config_get type $1 type disk
	config_get bstype $1 bstype rdwr
	config_get_bool readonly $1 readonly 0
	config_get_bool sync $1 sync 0
	config_get_bool direct $1 direct 0
	if [ $sync -ne 0 -o $direct -ne 0 ]; then
		local bsoflags
		[ $sync -ne 0 ] && bsoflags="sync"
		[ $direct -ne 0 ] && bsoflags="direct"
		[ $sync -ne 0 -a $direct -ne 0 ] && bsoflags="sync:direct"
		bsoflags="--bsoflags $bsoflags"
	fi

	local _tgtadm="$tgtadm --mode logicalunit --tid $tgtid --lun $lun"
	$_tgtadm --op new --backing-store $device --device-type $type --bstype $bstype --bstype $bstype $bsoflags || return 1
	$_tgtadm --op update --param readonly=$readonly || return 1
}

handle_account() {
	local tgtid=$2
	local _tgtadm="$tgtadm --mode account"
	local target user password outgoing

	config_get target $1 target ""
	[ "$target" ] || return 1
	[ $target -eq $tgtid ] || return 0

	config_get user $1 user ""
	[ "$user" ] || return 1

	config_get password $1 password ""
	config_get_bool outgoing $1 outgoing 0
	[ "$outgoing" -ne 0 ] && outgoing=--outgoing || outgoing=""

	$_tgtadm --op new --user "$user" --password "$password" || return 1
	$_tgtadm --op bind --tid $tgtid --user "$user" $outgoing || return 1
}

handle_target() {
	local tgtid=$1
	local tgtname allow
	local _tgtadm="$tgtadm --mode target"

	[ $tgtid -ge 0 ] || return 1

	config_get tgtname $1 name iqn.2012-06.org.openwrt
	config_get allow $1 allow ALL

	$_tgtadm --op new --tid $tgtid --targetname $tgtname || return 1
	$_tgtadm --op bind --tid $tgtid -I $allow || return 1

	config_foreach handle_lun lun $tgtid || return 1
	config_foreach handle_account account $tgtid || return 1
}

configure() {
	config_load $NAME
	$tgtadm --mode sys --op update --name State -v offline || return 1
	config_foreach handle_target target || return 1
	$tgtadm --mode sys --op update --name State -v ready || return 1
	return 0
}

start_service() {
	procd_open_instance
	procd_set_param command $PROG -f
	procd_set_param respawn
	procd_close_instance
	logger -t $NAME -s "Configuration will be loaded in seconds"
	( sleep 5; configure || { stop_service; exit 1; } ) &
}

stop_service() {
	$tgtadm --mode sys --op update --name State -v offline
	$tgtadm --mode target  --op show \
		| awk  '$1 == "Target" {sub(/:/,"",$2); print $2}' \
		| xargs -n1 $tgtadm --mode target --op delete --force --tid
	$tgtadm --mode sys --op delete
}

show() {
	$tgtadm --mode target --op show
}