OpenWrt – Rev 1

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#!/bin/sh /etc/rc.common
# Copyright (C) 2013 OpenWrt.org

START=61

USE_PROCD=1

find_nameserver() {
        . /lib/functions/network.sh

        local tmp
        if network_find_wan tmp && network_get_dnsserver tmp "$tmp"; then
                echo "${tmp%% *}"
                return 0
        fi

        return 1
}

start_instance() {
        local cfg="$1"
        local ipset ipset6 port dns

        config_get ipset "$cfg" ipset
        config_get ipset6 "$cfg" ipset6
        [ -n "$ipset$ipset6" ] || {
                echo "No ipset specified for instance $cfg" >&2
                return 1
        }

        config_get dns "$cfg" dns "$DEFNS"
        [ -n "$dns" ] || {
                echo "No DNS server specified for instance $cfg" >&2
                return 1
        }

        config_get port "$cfg" port $((PORT++))

        procd_open_instance
        procd_set_param command /usr/sbin/ipset-dns "$ipset" "$ipset6" "$port" "$dns"
        procd_set_param env NO_DAEMONIZE=1
        procd_set_param respawn
        procd_close_instance
}

service_triggers()
{
        procd_add_reload_trigger "ipset-dns"
}

start_service() {
        PORT=53001
        DEFNS="$(find_nameserver)"

        config_load ipset-dns
        config_foreach start_instance ipset-dns
}