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#!/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="
"

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" ] && 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)" \
		--cd "$dir" \
		--config "$conf"
	procd_set_param file "$dir/$conf"
	procd_close_instance
}

start_instance() {
	local s="$1"

	section_enabled "$s" || return 1

	config_get config "$s" config

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

	if [ ! -z "$config" ]; then
		openvpn_add_instance "$s" "$(dirname "$config")" "$(basename "$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" \
		auth_nocache auth_retry 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 \
		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_user_pass auth_user_pass_verify bcast_buffers ca cert \
		chroot cipher client_config_dir client_connect client_disconnect comp_lzo connect_freq \
		connect_retry connect_timeout connect_retry_max crl_verify dev dev_node dev_type dh \
		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_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 nice ns_cert_type ping \
		ping_exit ping_restart pkcs12 plugin port port_share prng proto 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_up rport script_security secret server server_bridge setenv shaper sndbuf \
		socks_proxy status status_version syslog tcp_queue_limit tls_auth \
		tls_cipher tls_remote tls_timeout tls_verify tmp_dir topology tran_window \
		tun_mtu tun_mtu_extra txqueuelen user verb down push up

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

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