#!/bin/sh /etc/rc.common
# vim: set noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 :
# Copyright (C) 2015 ovh.com
# Copyright (C) 2017 Ycarus (Yannick Chabanois) <ycarus@zugaina.org>

START=90
STOP=10

USE_PROCD=1
PROG_NAME=glorytun
PROG=/usr/sbin/${PROG_NAME}

_log() {
	logger -p daemon.info -t ${PROG_NAME} "$@"
}

_err() {
	logger -p daemon.err -t ${PROG_NAME} "$@"
}

validate_section() {
	uci_validate_section glorytun glorytun "${1}" \
		'enable:bool:0'      \
		'mptcp:bool:0'       \
		'mode:string'    \
		'key:string'         \
		'host:host'          \
		'port:port'          \
		'dev:string'         \
		'timeout:uinteger:10000'         \
		'chacha20:bool:0'    \
		'multiqueue:bool:1'  \
		'proto:string' \
		'localip:string' \
		'remoteip:string'
}

start_instance() {
	local enable key host port dev mptcp proto chacha20 mode multiqueue timeout localip remoteip
	local key_dir="/var/run/${PROG_NAME}"
	local key_file="${key_dir}/${1}.key"

	validate_section "${1}" || {
		_err "validation failed"
		return 1
	}

	[ "${enable}" = "1" ] || return 1
	[ "${proto}" = "tcp" ] || return 1
	[ -n "${key}" ] || {
		_err "Key empty"
		return 1
	}
	[ "${key}" != "secretkey" ] || return 1
	[ -n "${port}" ] || return 1
	[ -n "${dev}" ] || return 1
	[ -n "${host}" ] || return 1

	mkdir -p "$key_dir"
	chmod 0700 "$key_dir"
	( umask 077; printf '%s\n' "$key" > "$key_file" )
	[ -f "$key_file" ] || {
		_err "can't create key file"
		return 1
	}
	key=""

	if [ "$(uci -q get network.omrvpn)" != "" ]; then
		uci -q set network.omrvpn.device=${dev}
		uci -q commit network
	fi

	_log "starting ${PROG_NAME} ${1} instance $*"

	procd_open_instance

	procd_set_param command ${PROG} \
		keyfile "$key_file" \
		${port:+port "$port"} \
		${host:+host "$host"} \
		${dev:+dev "$dev"} 

	[ "${mode}" = "listener" ] && procd_append_param command listener
	[ "${mptcp}" = "1" ] && procd_append_param command mptcp
	[ "${chacha20}" = "1" ] && procd_append_param command chacha20
	[ "${multiqueue}" = "1" ] && procd_append_param command multiqueue

	procd_append_param command \
		retry count -1 const 5000000 \
		timeout ${timeout} \
		keepalive count 5 idle 20 interval 2 \
		buffer-size 65536

	procd_set_param respawn 0 30 0
	procd_set_param nice 10
	procd_set_param file "$key_file"

	procd_set_param stdout 1
	procd_set_param stderr 1

	procd_close_instance

	# Configure the tunnel addresses once glorytun has created the device.
	# RPS/XPS steering for it is set by /etc/hotplug.d/net/20-rps-xps
	# (openmptcprouter package), which handles every interface.
	if [ -n "$localip" ] && [ -n "$remoteip" ]; then
	(
		count=0
		while [ $count -lt 10 ]; do
			if [ -d "/sys/class/net/$dev" ]; then
				ifconfig "$dev" "$localip" pointopoint "$remoteip" up && \
					_log "Configured $dev with IP $localip peer $remoteip"
				break
			fi
			sleep 1
			count=$((count + 1))
		done
	) &
	fi
}

start_service() {
	config_load glorytun
	config_foreach start_instance glorytun
}

service_triggers() {
	procd_add_reload_trigger glorytun network
}