#!/bin/sh

# CTDB event script for TGTD based iSCSI

[ -n "$CTDB_BASE" ] || \
    CTDB_BASE=$(d=$(dirname "$0") ; cd -P "$d" ; dirname "$PWD")

. "${CTDB_BASE}/functions"

# service_name is used by various functions
# shellcheck disable=SC2034
service_name="iscsi"

loadconfig

is_ctdb_managed_service || exit 0

[ -z "$CTDB_START_ISCSI_SCRIPTS" ] && {
	echo "No iscsi start script directory found"
	exit 0
}

case "$1" in
ipreallocated)
	all_ips=$($CTDB -X ip | tail -n +2)

	# Block the iSCSI port.  Only block for the address families
	# we have configured.  This copes with, for example, ip6tables
	# being unavailable on an IPv4-only system.
	have_ipv4=false
	have_ipv6=false
	# x is intentionally ignored
	# shellcheck disable=SC2034
	while IFS='|' read x ip pnn x ; do
	    case "$ip" in
		*:*) have_ipv6=true ;;
		*)   have_ipv4=true ;;
		esac
	done <<EOF
$all_ips
EOF
	if $have_ipv4 ; then
	    iptables -I INPUT 1 -p tcp --dport 3260 -j DROP
	fi
	if $have_ipv6 ; then
	    ip6tables -I INPUT 1 -p tcp --dport 3260 -j DROP
	fi

	# Stop iSCSI daemon
	killall -9 tgtd >/dev/null 2>/dev/null

	pnn=$(ctdb_get_pnn)
	[ -n "$pnn" ] || die "Failed to get node pnn"

	# Start iSCSI daemon
	tgtd >/dev/null 2>&1

	# Run a script for each currently hosted public IP address
	ips=$(echo "$all_ips" | awk -F'|' -v pnn="$pnn" '$3 == pnn {print $2}')
	for ip in $ips ; do
	    script="${CTDB_START_ISCSI_SCRIPTS}/${ip}.sh"
	    if [ -x "$script" ] ; then
		echo "Starting iSCSI service for public address ${ip}"
		"$script"
	    fi
	done

	# Unblock iSCSI port.  These can be unconditional (compared to
	# blocking above), since errors are redirected.
	while iptables -D INPUT -p tcp --dport 3260 -j DROP >/dev/null 2>&1 ; do
	    :
	done
	while ip6tables -D INPUT -p tcp --dport 3260 -j DROP >/dev/null 2>&1 ; do
	    :
	done

	;;

shutdown)
	# Shutdown iSCSI daemon when ctdb goes down
	killall -9 tgtd >/dev/null 2>&1
	;;

monitor)
	ctdb_check_tcp_ports 3260 || exit $?
	;;
esac

exit 0