#!/bin/sh
# DDNS update for DYNDNS.org
# Script version 1.02 Rafal Drzymala 2013,2014
#
# Changelog
#    1.00    RD    First stable code
#    1.01    RD    Added detectip parameter
#    1.02    RD    Added service parameter
#
# Destination /etc/hotplug.d/iface/90-ddns-update
#

. /lib/functions.sh
. /lib/functions/network.sh

local wan_if

do_ddns() {
    local enabled
    local service
    local username
    local password
    local domain
    local detectip
    local wan_ip
    local service_url
    config_get_bool enabled $1 enabled 1
    if [ $enabled == 1 ]; then
        config_get service $1 service "dyndns.org"
        config_get username $1 username
        config_get password $1 password
        config_get domain $1 domain
        config_get_bool detectip $1 detectip 0
        case $service in
            dyndns.org)
                service_url="members.dyndns.org/nic/update";;
            no-ip.com)
                service_url="dynupdate.no-ip.com/nic/update";;
            *)
                logger -p user.notice -t "ddns-update[$service]" "Unknown service: $service"
                return;;
        esac
        if [ $detectip == 1 ]; then
            wan_ip="detect IP"
            myip=""
        else
            network_get_ipaddr wan_ip $wan_if
            if [ "$wan_ip" == "" ]; then
                logger -p user.notice -t "ddns-update[$service]" "Unable to get interface $wan_if IP address."
                return
            fi
            myip="&myip=$wan_ip"
        fi
        logger -p user.notice -t "ddns-update[$service]" "Register in DDNS because interface $wan_if ($wan_ip) is up."
        local result=$(wget -q -O - "http://$username:$password@$service_url?hostname=$domain$myip")
        case $result in
            badauth)
                logger -p user.notice -t "ddns-update[$service]" "The username and password pair do not match a real user.";;
            good*)
                logger -p user.notice -t "ddns-update[$service]" "The update was successful, and the hostname is now updated.";;
            nochg*)
                logger -p user.notice -t "ddns-update[$service]" "The update changed no settings, and is considered abusive ($result).";;
            notfqdn)
                logger -p user.notice -t "ddns-update[$service]" "The hostname specified is not a fully-qualified domain name (not in the form hostname.dyndns.org or domain.com).";;
            nohost)
                logger -p user.notice -t "ddns-update[$service]" "The hostname specified does not exist in this user account (or is not in the service specified in the system parameter).";;
            numhost)
                logger -p user.notice -t "ddns-update[$service]" "Too many hosts (more than 20) specified in an update. Also returned if trying to update a round robin (which is not allowed).";;
            abuse)
                logger -p user.notice -t "ddns-update[$service]" "The hostname specified is blocked for update abuse.";;
            badagent)
                logger -p user.notice -t "ddns-update[$service]" "The user agent was not sent or HTTP method is not permitted (we recommend use of GET request method).";;
            dnserr)
                logger -p user.notice -t "ddns-update[$service]" "DNS error encountered.";;
            "911")
                logger -p user.notice -t "ddns-update[$service]" "There is a problem or scheduled maintenance on our side.";;
            *)
                logger -p user.notice -t "ddns-update[$service]" "Unknown result: $result";;
        esac
    fi
}

network_find_wan wan_if
[ "$wan_if" == "" ] && exit 0
if [ "$INTERFACE" == "$wan_if" ] && [ "$ACTION" == "ifup" ]; then
    config_load system
    config_foreach do_ddns ddns
fi
exit 0
# Done.

config ddns 'wan_no_ip'
    option enabled '1'
    option service 'no-ip.com'
    option domain 'nazwa_hosta'
    option detectip '1'
    option username 'nazwa_użytkownika'
    option password 'hasło'

ifup wan
logread