#!/bin/false

mach=$(basename $(dirname "$0"))

netns=netns
nethorror_root="`pwd`" # and hope?

warn() {
	echo >&2 "Warning:" "$@"
}

die() {
	echo >&2 "DIE:" "$@"
	exit 42
}

ensure_started() {
	test -e state/$mach/$netns || machines/$mach/start.sh
}

setup_for_router4() {
	sysctl net.ipv4.conf.all.forwarding=1
}

setup_for_router6() {
	sysctl net.ipv6.conf.all.forwarding=1
}

setup_for_router() {
	setup_for_router4
	setup_for_router6
}

attach() {
	machines/$mach/attach.sh "$@"
}

setup_statedir() {
	dir="state/$mach"
	mkdir "$dir"
	for ns in $namespaces; do
		nsfile="${ns#*=}"
		touch "$nsfile"
	done
}

bridge_name() {
	echo "br_$1"
}

make_bridge() {
	br="$(bridge_name "$mach")"
	ip link add name "$br" type bridge
	ip link set dev "$br" up
}

veth_to_bridge() {
	ifname="$1"
	br_raw="$2"
	if test "$#" -gt 2; then
		ve_br_orig="$3"
	else
		ve_br_orig="ve_${mach}_${br_raw}"
	fi
	br="$(bridge_name "$br_raw")"
	ve_br="${ve_br_orig::15}"
	test "$ve_br" != "$ve_br_orig" && warn "interface name $ve_br_orig shortened to $ve_br"
	ip link show dev "$ve_br" >/dev/null 2>&1 && die "interface $ve_br already exists!"
	ip link add name "$ifname" type veth peer "$ve_br"
	ip link set dev "$ve_br" master "$br"
	ip link set dev "$ve_br" up
	ip link set dev "$ifname" netns ./state/$mach/netns # FIXME: hardcoded
}