#!/bin/sh /etc/rc.common
# Copyright (C) 2008-2013 OpenWrt.org
# Copyright (C) 2008 Jo-Philipp Wich
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.

START=90
STOP=10

USE_PROCD=1
PROG=/usr/sbin/openvpn

LIST_SEP="
"

UCI_STARTED=
UCI_DISABLED=

append_param() {
	local s="$1"
	local v="$2"
	case "$v" in
		*_*_*_*) v=${v%%_*}-${v#*_}; v=${v%%_*}-${v#*_}; v=${v%%_*}-${v#*_} ;;
		*_*_*)   v=${v%%_*}-${v#*_}; v=${v%%_*}-${v#*_} ;;
		*_*)     v=${v%%_*}-${v#*_} ;;
	esac
	echo -n "$v" >> "/var/etc/openvpn-$s.conf"
	return 0
}

append_bools() {
	local p; local v; local s="$1"; shift
	for p in $*; do
		config_get_bool v "$s" "$p"
		[ "$v" = 1 ] && append_param "$s" "$p" && echo >> "/var/etc/openvpn-$s.conf"
	done
}

append_params() {
	local p; local v; local s="$1"; shift
	for p in $*; do
		config_get v "$s" "$p"
		IFS="$LIST_SEP"
		for v in $v; do
			[ -n "$v" ] && [ "$p" != "push" ] && append_param "$s" "$p" && echo " $v" >> "/var/etc/openvpn-$s.conf"
			[ -n "$v" ] && [ "$p" == "push" ] && append_param "$s" "$p" && echo " \"$v\"" >> "/var/etc/openvpn-$s.conf"
		done
		unset IFS
	done
}

section_enabled() {
	config_get_bool enable  "$1" 'enable'  0
	config_get_bool enabled "$1" 'enabled' 0
	[ $enable -gt 0 ] || [ $enabled -gt 0 ]
}

openvpn_add_instance() {
	local name="$1"
	local dir="$2"
	local conf="$3"

	procd_open_instance
	procd_set_param command "$PROG"	\
		--syslog "openvpn($name)" \
		--status "/var/run/openvpn.$name.status" \
		--cd "$dir" \
		--config "$conf"
	procd_set_param file "$dir/$conf"
	procd_set_param respawn
	procd_close_instance
}

start_instance() {
	local s="$1"

	config_get config "$s" config
	config="${config:+$(readlink -f "$config")}"

	section_enabled "$s" || {
		append UCI_DISABLED "$config" "$LIST_SEP"
		return 1
	}

	[ ! -d "/var/run" ] && mkdir -p "/var/run"

	if [ ! -z "$config" ]; then
		append UCI_STARTED "$config" "$LIST_SEP"
		openvpn_add_instance "$s" "${config%/*}" "$config"
		return
	fi

	[ ! -d "/var/etc" ] && mkdir -p "/var/etc"
	[ -f "/var/etc/openvpn-$s.conf" ] && rm "/var/etc/openvpn-$s.conf"

	# append flags
	append_bools "$s" \
		allow_recursive_routing auth_nocache auth_user_pass_optional bind ccd_exclusive client client_cert_not_required \
		client_to_client comp_noadapt disable disable_occ down_pre duplicate_cn fast_io float http_proxy_retry \
		ifconfig_noexec ifconfig_nowarn ifconfig_pool_linear management_forget_disconnect management_hold \
		management_query_passwords management_signal mktun mlock mtu_test multihome mute_replay_warnings \
		ncp_disable nobind no_iv no_name_remapping no_replay opt_verify passtos persist_key persist_local_ip \
		persist_remote_ip persist_tun ping_timer_rem pull push_reset remote_random rmtun route_noexec route_nopull \
		single_session socks_proxy_retry suppress_timestamps tcp_nodelay test_crypto tls_client tls_exit tls_server \
		tun_ipv6 up_delay up_restart username_as_common_name

	# append params
	append_params "$s" \
		cd askpass auth auth_retry auth_user_pass auth_user_pass_verify bcast_buffers ca cert capath \
		chroot cipher client_config_dir client_connect client_disconnect comp_lzo compress connect_freq \
		connect_retry connect_timeout connect_retry_max crl_verify dev dev_node dev_type dh \
		ecdh_curve echo engine explicit_exit_notify fragment group hand_window hash_size http_proxy \
		http_proxy_option http_proxy_timeout ifconfig ifconfig_pool ifconfig_pool_persist ifconfig_push \
		inactive ipchange iroute keepalive key key_direction key_method keysize learn_address link_mtu lladdr \
		local log log_append lport management management_log_cache max_clients max_routes_per_client mode \
		mssfix mtu_disc mute ncp_ciphers nice ns_cert_type ping ping_exit ping_restart pkcs12 plugin \
		port port_share prng proto pull_filter rcvbuf redirect_gateway remap_usr1 remote remote_cert_eku \
		remote_cert_ku remote_cert_tls reneg_bytes reneg_pkts reneg_sec replay_persist replay_window \
		resolv_retry route route_delay route_gateway route_metric route_pre_down route_up rport \
		script_security secret server server_bridge setenv shaper sndbuf socks_proxy status status_version \
		syslog tcp_queue_limit tls_auth tls_crypt tls_version_min tls_cipher tls_timeout \
		tls_verify tmp_dir topology tran_window tun_mtu tun_mtu_extra txqueuelen user verb \
		down push up verify_x509_name x509_username_field ifconfig_ipv6 route_ipv6 server_ipv6 \
		ifconfig_ipv6_pool ifconfig_ipv6_push iroute_ipv6

	openvpn_add_instance "$s" "/var/etc" "openvpn-$s.conf"
}

start_service() {
	config_load 'openvpn'
	config_foreach start_instance 'openvpn'

	local path name
	for path in /etc/openvpn/*.conf; do
		if [ -f "$path" ]; then
			name="${path##*/}"; name="${name%.conf}"

			# don't start configs again that are already started by uci
			if echo "$UCI_STARTED" | grep -qxF "$path"; then
				continue

			# don't start configs which are set to disabled in uci
			elif echo "$UCI_DISABLED" | grep -qxF "$path"; then
				logger -t openvpn "$name.conf is disabled in /etc/config/openvpn"
				continue
			fi

			openvpn_add_instance "$name" "${path%/*}" "$path"
		fi
	done
}

service_triggers() {
	procd_add_reload_trigger openvpn
}
