smartdns/package/openwrt/files/etc/init.d/smartdns

#!/bin/sh /etc/rc.common
# Copyright (C) 2018 Nick Peng (pymumu@gmail.com)

START=99
SERVICE_USE_PID=1
SERVICE_WRITE_PID=1
SERVICE_DAEMONIZE=1
BASECONFIGFILE="/etc/smartdns/smartdns.conf"
SMARTDNS_CONF="/var/etc/smartdns.conf"
ADDRESS_CONF="/etc/smartdns/address.conf"
CUSTOM_CONF="/etc/smartdns/custom.conf"
SMARTDNS_CONF_TMP="${SMARTDNS_CONF}.tmp"

set_iptable()
{
	local ipv6_server=$1
	IPS="`ifconfig | grep "inet addr" | grep -v ":127" | grep "Bcast" | awk '{print $2}' | awk -F : '{print $2}'`"
	for IP in $IPS
	do
		iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-ports $SMARTDNS_PORT >/dev/null 2>&1
	done

	if [ "$ipv6_server" == 0 ]; then
		return
	fi

	IPS="`ifconfig | grep "inet6 addr" | grep -v " fe80::" | grep -v " ::1" | grep "Global" | awk '{print $3}'`"
	for IP in $IPS
	do
		ip6tables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-ports $SMARTDNS_PORT >/dev/null 2>&1
	done

}

clear_iptable()
{
	local ipv6_server=$1
	IPS="`ifconfig | grep "inet addr" | grep -v ":127" | grep "Bcast" | awk '{print $2}' | awk -F : '{print $2}'`"
	for IP in $IPS
	do
		iptables -t nat -D PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-ports $SMARTDNS_PORT >/dev/null 2>&1
	done

	if [ "$ipv6_server" == 0 ]; then
		return
	fi

	IPS="`ifconfig | grep "inet6 addr" | grep -v " fe80::" | grep -v " ::1" | grep "Global" | awk '{print $3}'`"
	for IP in $IPS
	do
		ip6tables -t nat -D PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-ports $SMARTDNS_PORT >/dev/null 2>&1
	done
	
}

service_triggers() {
    procd_add_reload_trigger firewall
}


conf_append()
{
	echo "$1 $2" >> $SMARTDNS_CONF_TMP
}

load_server()
{
	local section="$1"
	config_get "port" "$section" "port" "53"
	config_get "type" "$section" "type" "udp"
	config_get "ip" "$section" "ip" ""

	if [ -z "$port" ] || [ -z "$ip" ] || [ -z "$type" ]; then
		return
	fi

	SERVER="server"
	if [ "$type" = "tcp" ]; then
		SERVER="server-tcp"
	elif [ "$type" = "tls" ]; then
		SERVER="server-tls"
	fi

	if [ ! -z "`echo $ip | grep ":"`" ]; then
		if [ -z "`echo $ip | grep "\["`" ]; then
			ip="[$ip]"
		fi
	fi

	conf_append "$SERVER" "$ip:$port"

}

start_service() {
	local section="$1"
	args=""

	config_get "server_name" "$section" "server_name" ""
	if [ ! -z "$server_name" ]; then
		conf_append "server-name" "$server_name"	
	fi

	config_get "port" "$section" "port" "5353"
	config_get "ipv6_server" "$section" "ipv6_server" "1"
	if [ "$ipv6_server" = "1" ]; then
		conf_append "bind" "[::]:$port"
	else
		conf_append "bind" ":$port"
	fi
	SMARTDNS_PORT="$port"

	mkdir -p $(dirname $SMARTDNS_CONF)

	config_get "cache_size" "$section" "cache_size" ""
	if [ ! -z "$cache_size" ]; then
		conf_append "cache-size" "$cache_size"
	fi

	config_get "rr_ttl" "$section" "rr_ttl" ""
	if [ ! -z "$rr_ttl" ]; then
		conf_append "rr-ttl" "$rr_ttl"
	fi

	config_get "rr_ttl_min" "$section" "rr_ttl_min" ""
	if [ ! -z "$rr_ttl_min" ]; then
		conf_append "rr-ttl-min" "$rr_ttl_min"
	fi

	config_get "rr_ttl_max" "$section" "rr_ttl_max" ""
	if [ ! -z "$rr_ttl_max" ]; then
		conf_append "rr-ttl-max" "$rr_ttl_max"
	fi

	config_get "log_size" "$section" "log_size" "128K"
	if [ ! -z "$log_size" ]; then
		conf_append "log-size" "$log_size"
	fi

	config_get "log_num" "$section" "log_num" "3"
	if [ ! -z "$log_num" ]; then
		conf_append "log-num" "$log_num"
	fi

	config_get "log_level" "$section" "log_level" "error"
	if [ ! -z "$log_level" ]; then
		conf_append "log-level" "$log_level"
	fi

	config_get "log_file" "$section" "log_file" ""
	if [ ! -z "$log_file" ]; then
		conf_append "log-file" "$log_file"
	fi

	clear_iptable
	config_get_bool "redirect" "$section" "redirect" '0'
	if [ "$redirect" -eq 1 ]; then
		set_iptable $ipv6_server
	fi

	config_foreach load_server "server"

	echo "conf-file $ADDRESS_CONF" >> $SMARTDNS_CONF_TMP
	echo "conf-file $CUSTOM_CONF" >> $SMARTDNS_CONF_TMP

	config_get_bool "enabled" "$section" "enabled" '0'
	mv $SMARTDNS_CONF_TMP $SMARTDNS_CONF
	[ "$enabled" -gt 0 ] || return 1
	service_start /usr/sbin/smartdns $args -c $SMARTDNS_CONF
}

start() {
	config_load "smartdns"
	config_foreach start_service "smartdns"
}

stop() {
	service_stop /usr/sbin/smartdns
}