luci-app-ddns: rollup to 2.3.0 to reflect changes on ddns-scripts

- support for new options "lookup_host", "param_enc" and "param_opt"
- rewritten ddns provider handling to only show/check needed options "domain", "username", etc.
- modified version check/handling incl. using new ipkg.compare_versions function
- modified map.title and map.description generation
- changed XHR.poll interval to 15 seconds on system status page
- using new value_parse function for testing and later implementation into cbi.lua
- some optimizations

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

11 files changed, 732 insertions, 406 deletions

diff --git a/applications/luci-app-ddns/luasrc/controller/ddns.lua b/applications/luci-app-ddns/luasrc/controller/ddns.lua
index 4fbd3c3fc..29598ea8a 100644
--- a/applications/luci-app-ddns/luasrc/controller/ddns.lua
+++ b/applications/luci-app-ddns/luasrc/controller/ddns.lua
@@ -10,28 +10,43 @@ local NX   = require "nixio"
 local NXFS = require "nixio.fs"
 local DISP = require "luci.dispatcher"
 local HTTP = require "luci.http"
-local UCI  = require "luci.model.uci"
+local I18N = require "luci.i18n" 		-- not globally avalible here
+local IPKG = require "luci.model.ipkg"
 local SYS  = require "luci.sys"
-local DDNS = require "luci.tools.ddns"		-- ddns multiused functions
+local UCI  = require "luci.model.uci"
 local UTIL = require "luci.util"
+local DDNS = require "luci.tools.ddns"		-- ddns multiused functions
 
-DDNS_MIN = "2.4.2-1"	-- minimum version of service required
+local srv_name    = "ddns-scripts"
+local srv_ver_min = "2.5.0"			-- minimum version of service required
+local srv_ver_cmd = [[/usr/lib/ddns/dynamic_dns_updater.sh --version | awk {'print $2'}]]
+local app_name    = "luci-app-ddns"
+local app_title   = "Dynamic DNS"
+local app_version = "2.3.0-1"
 
 function index()
 	local nxfs	= require "nixio.fs"		-- global definitions not available
 	local sys	= require "luci.sys"		-- in function index()
 	local ddns	= require "luci.tools.ddns"	-- ddns multiused functions
-	local verinst	= ddns.ipkg_ver_installed("ddns-scripts")
-	local verok	= ddns.ipkg_ver_compare(verinst, ">=", "2.0.0-0")
-	-- do NOT start it not ddns-scripts version 2.x
-	if not verok then
-		return
-	end
+	local muci	= require "luci.model.uci"
+
 	-- no config create an empty one
 	if not nxfs.access("/etc/config/ddns") then
 		nxfs.writefile("/etc/config/ddns", "")
 	end
 
+	-- preset new option "lookup_host" if not already defined
+	local uci = muci.cursor()
+	local commit = false
+	uci:foreach("ddns", "service", function (s)
+		if not s["lookup_host"] and s["domain"] then
+			uci:set("ddns", s[".name"], "lookup_host", s["domain"])
+			commit = true
+		end
+	end)
+	if commit then uci:commit("ddns") end
+	uci:unload("ddns")
+
 	entry( {"admin", "services", "ddns"}, cbi("ddns/overview"), _("Dynamic DNS"), 59)
 	entry( {"admin", "services", "ddns", "detail"}, cbi("ddns/detail"), nil ).leaf = true
 	entry( {"admin", "services", "ddns", "hints"}, cbi("ddns/hints",
@@ -42,7 +57,60 @@ function index()
 	entry( {"admin", "services", "ddns", "status"}, call("status") ).leaf = true
 end
 
--- function to read all sections status and return data array
+-- Application specific information functions
+function app_description()
+	return	I18N.translate("Dynamic DNS allows that your router can be reached with " ..
+			"a fixed hostname while having a dynamically changing IP address.")
+		.. [[<br />]]
+		.. I18N.translate("OpenWrt Wiki") .. ": "
+		.. [[<a href="http://wiki.openwrt.org/doc/howto/ddns.client" target="_blank">]]
+		.. I18N.translate("DDNS Client Documentation") .. [[</a>]]
+		.. " --- "
+		.. [[<a href="http://wiki.openwrt.org/doc/uci/ddns" target="_blank">]]
+		.. I18N.translate("DDNS Client Configuration") .. [[</a>]]
+end
+function app_title_back()
+	return	[[<a href="]]
+		.. DISP.build_url("admin", "services", "ddns")
+		.. [[">]]
+		.. I18N.translate(app_title)
+		.. [[</a>]]
+end
+
+-- Standardized application/service functions
+function app_title_main()
+	return	[[<a href="javascript:alert(']]
+			.. I18N.translate("Version Information")
+			.. [[\n\n]] .. app_name
+			.. [[\n\t]] .. I18N.translate("Version") .. [[:\t]] .. app_version
+			.. [[\n\n]] .. srv_name .. [[ ]] .. I18N.translate("required") .. [[:]]
+			.. [[\n\t]] .. I18N.translate("Version") .. [[:\t]]
+				.. srv_ver_min .. [[ ]] .. I18N.translate("or higher")
+			.. [[\n\n]] .. srv_name .. [[ ]] .. I18N.translate("installed") .. [[:]]
+			.. [[\n\t]] .. I18N.translate("Version") .. [[:\t]]
+				.. (service_version() or I18N.translate("NOT installed"))
+			.. [[\n\n]]
+	 	.. [[')">]]
+		.. I18N.translate(app_title)
+		.. [[</a>]]
+end
+function service_version()
+	local ver = nil
+	IPKG.list_installed(srv_name, function(n, ver, d)
+			-- nothing to do
+		end
+	)
+	if not ver then
+		ver = UTIL.exec(srv_ver_cmd)
+		if #ver == 0 then ver = nil end
+	end
+	return	ver
+end
+function service_ok()
+	return	IPKG.compare_versions((service_version() or "0"), ">=", srv_ver_min)
+end
+
+-- internal function to read all sections status and return data array
 local function _get_status()
 	local uci	 = UCI.cursor()
 	local service	 = SYS.init.enabled("ddns") and 1 or 0
@@ -118,12 +186,12 @@ local function _get_status()
 		end
 
 		-- try to get registered IP
-		local domain	= s["domain"] or "_nodomain_"
+		local lookup_host = s["lookup_host"] or "_nolookup_"
 		local dnsserver	= s["dns_server"] or ""
 		local force_ipversion = tonumber(s["force_ipversion"] or 0)
 		local force_dnstcp = tonumber(s["force_dnstcp"] or 0)
 		local command = [[/usr/lib/ddns/dynamic_dns_lucihelper.sh]]
-		command = command .. [[ get_registered_ip ]] .. domain .. [[ ]] .. use_ipv6 ..
+		command = command .. [[ get_registered_ip ]] .. lookup_host .. [[ ]] .. use_ipv6 ..
 			[[ ]] .. force_ipversion .. [[ ]] .. force_dnstcp .. [[ ]] .. dnsserver
 		local reg_ip = SYS.exec(command)
 		if reg_ip == "" then
@@ -135,7 +203,7 @@ local function _get_status()
 			section  = section,
 			enabled  = enabled,
 			iface    = iface,
-			domain   = domain,
+			lookup   = lookup_host,
 			reg_ip   = reg_ip,
 			pid      = pid,
 			datelast = datelast,
@@ -235,3 +303,4 @@ function status()
 	HTTP.prepare_content("application/json")
 	HTTP.write_json(data)
 end
+
diff --git a/applications/luci-app-ddns/luasrc/model/cbi/ddns/detail.lua b/applications/luci-app-ddns/luasrc/model/cbi/ddns/detail.lua
index e655ce521..88429fd12 100644
--- a/applications/luci-app-ddns/luasrc/model/cbi/ddns/detail.lua
+++ b/applications/luci-app-ddns/luasrc/model/cbi/ddns/detail.lua
@@ -8,13 +8,15 @@ local NX   = require "nixio"
 local NXFS = require "nixio.fs"
 local SYS  = require "luci.sys"
 local UTIL = require "luci.util"
+local HTTP = require "luci.http"
 local DISP = require "luci.dispatcher"
 local WADM = require "luci.tools.webadmin"
 local DTYP = require "luci.cbi.datatypes"
+local CTRL = require "luci.controller.ddns"	-- this application's controller
 local DDNS = require "luci.tools.ddns"		-- ddns multiused functions
 
 -- takeover arguments -- #######################################################
-local section	= arg[1]
+local section = arg[1]
 
 -- check supported options -- ##################################################
 -- saved to local vars here because doing multiple os calls slow down the system
@@ -31,15 +33,15 @@ local bold_on	= "<strong>"
 local bold_off	= "</strong>"
 
 -- error text constants -- #####################################################
-err_ipv6_plain = translate("IPv6 not supported") .. " - " ..
+local err_ipv6_plain = translate("IPv6 not supported") .. " - " ..
 		translate("please select 'IPv4' address version")
-err_ipv6_basic = bold_on ..
+local err_ipv6_basic = bold_on ..
 			font_red ..
 				translate("IPv6 not supported") ..
 			font_off ..
 			"<br />" .. translate("please select 'IPv4' address version") ..
 		 bold_off
-err_ipv6_other = bold_on ..
+local err_ipv6_other = bold_on ..
 			font_red ..
 				translate("IPv6 not supported") ..
 			font_off ..
@@ -52,16 +54,46 @@ err_ipv6_other = bold_on ..
 			[[</a>]] ..
 		 bold_off
 
-function err_tab_basic(self)
+local function err_tab_basic(self)
 	return translate("Basic Settings") .. " - " .. self.title .. ": "
 end
-function err_tab_adv(self)
+local function err_tab_adv(self)
 	return translate("Advanced Settings") .. " - " .. self.title .. ": "
 end
-function err_tab_timer(self)
+local function err_tab_timer(self)
 	return translate("Timer Settings") .. " - " .. self.title .. ": "
 end
 
+-- read services/services_ipv6 files -- ########################################
+local services4 = { }		-- IPv4 --
+local fd4 = io.open("/usr/lib/ddns/services", "r")
+if fd4 then
+	local ln, s, t
+	repeat
+		ln = fd4:read("*l")
+		s  = ln and ln:match('^%s*".*')	-- only handle lines beginning with "
+		s  = s  and  s:gsub('"','')	-- remove "
+		t  = s  and UTIL.split(s,"(%s+)",nil,true)	-- split on whitespaces
+		if t then services4[t[1]]=t[2] end
+	until not ln
+	fd4:close()
+end
+
+local services6 = { }		-- IPv6 --
+local fd6 = io.open("/usr/lib/ddns/services_ipv6", "r")
+if fd6 then
+	local ln, s, t
+	repeat
+		ln = fd6:read("*l")
+		s  = ln and ln:match('^%s*".*')	-- only handle lines beginning with "
+		s  = s  and  s:gsub('"','')	-- remove "
+		t  = s  and UTIL.split(s,"(%s+)",nil,true)	-- split on whitespaces
+		if t then services6[t[1]]=t[2] end
+	until not ln
+	fd6:close()
+end
+
+-- multi-used functions -- ####################################################
 -- function to verify settings around ip_source
 -- will use dynamic_dns_lucihelper to check if
 -- local IP can be read
@@ -105,17 +137,94 @@ local function _verify_ip_source()
 	end
 end
 
--- cbi-map definition -- #######################################################
-m = Map("ddns")
+-- function to check if option is used inside url or script
+-- return -1 on error, 0 NOT required, 1 required
+local function _option_used(option, urlscript)
+	local surl	-- search string for url
+	local ssh	-- search string for script
+	local required	-- option used inside url or script
 
-m.title = [[<a href="]] .. DISP.build_url("admin", "services", "ddns") .. [[">]] ..
-		translate("Dynamic DNS") .. [[</a>]]
+	if     option == "domain"    then surl, ssh = '%[DOMAIN%]', '%$domain'
+	elseif option == "username"  then surl, ssh = '%[USERNAME%]', '%$username'
+	elseif option == "password"  then surl, ssh = '%[PASSWORD%]', '%$password'
+	elseif option == "param_enc" then surl, ssh = '%[PARAMENC%]', '%$param_enc'
+	elseif option == "param_opt" then surl, ssh = '%[PARAMOPT%]', '%$param_opt'
+	else
+		error("undefined option")
+		return -1	-- return on error
+	end
 
-m.description = translate("Dynamic DNS allows that your router can be reached with " ..
-			"a fixed hostname while having a dynamically changing " ..
-			"IP address.")
+	local required = false
+	-- handle url
+	if urlscript:find('http') then
+		required = ( urlscript:find(surl) )
+	-- handle script
+	else
+		if not urlscript:find("/") then
+			-- might be inside ddns-scripts directory
+			urlscript = "/usr/lib/ddns/" .. urlscript
+		end
+		-- problem with script exit here
+		if not NXFS.access(urlscript) then return -1 end
+
+		local f = io.input(urlscript)
+		-- still problem with script exit here
+		if not f then return -1 end
+		for l in f:lines() do
+			repeat
+				if l:find('^#') then break end  -- continue on comment lines
+				required = ( l:find(surl) or l:find(ssh) )
+			until true
+			if required then break end
+		end
+		f:close()
+	end
+	return (required and 1 or 0)
+end
 
-m.redirect = DISP.build_url("admin", "services", "ddns")
+-- function to verify if option is valid
+local function _option_validate(self, value)
+	-- section is globally defined here be calling agrument (see above)
+	local fusev6 = usev6:formvalue(section)
+	local fsvc4  = svc4:formvalue(section)
+	local fsvc6  = svc6:formvalue(section)
+	local urlsh, used
+
+	-- IP-Version dependent custom service selected
+	if (fusev6 == "0" and fsvc4 == "-") or
+	   (fusev6 == "1" and fsvc6 == "-") then
+		-- read custom url
+		urlsh = uurl:formvalue(section)
+		-- no url then read custom script
+		if not urlsh or (#urlsh == 0) then
+			urlsh = ush:formvalue(section)
+		end
+	-- IPv4 read from services4 table
+	elseif (fusev6 == "0") then
+		urlsh = services4[fsvc4]
+	-- IPv6 read from services6 table
+	else
+		urlsh = services6[fsvc6]
+	end
+	-- problem with url or script exit here
+	-- error handled somewhere else
+	if not urlsh or (#urlsh == 0) then return "" end
+
+	used = _option_used(self.option, urlsh)
+	-- on error or not used return empty sting
+	if used < 1 then return "" end
+	-- needed but no data then return error
+	if not value or (#value == 0) then
+		return nil, err_tab_basic(self) .. translate("missing / required")
+	end
+	return value
+end
+
+-- cbi-map definition -- #######################################################
+local m 	= Map("ddns")
+m.title		= CTRL.app_title_back()
+m.description	= CTRL.app_description()
+m.redirect	= DISP.build_url("admin", "services", "ddns")
 
 m.on_after_commit = function(self)
 	if self.changed then	-- changes ?
@@ -126,19 +235,42 @@ m.on_after_commit = function(self)
 	end
 end
 
+-- provider switch was requested, save and reload page
+if m:formvalue("cbid.ddns.%s._switch" % section) then	-- section == arg[1]
+	local fsvc
+	local fusev6 = m:formvalue("cbid.ddns.%s.use_ipv6" % section)
+	if fusev6 == "1" then
+		fsvc = m:formvalue("cbid.ddns.%s.ipv6_service_name" % section)
+	else
+		fsvc = m:formvalue("cbid.ddns.%s.ipv4_service_name" % section)
+	end
+
+	if fusev6 ~= (m:get(section, "use_ipv6") or "0") then	-- IPv6 was changed
+		m:set(section, "use_ipv6", fusev6)		-- save it
+	end
+
+	if fsvc ~= "-" then					-- NOT "custom"
+		m:set(section, "service_name", fsvc)		-- save it
+	else							-- else
+		m:del(section, "service_name")			-- delete it
+	end
+	m.uci:save(m.config)
+
+	-- reload page
+	HTTP.redirect( DISP.build_url("admin", "services", "ddns", "detail", section) )
+	return
+end
+
 -- read application settings -- ################################################
 -- date format; if not set use ISO format
-date_format = m.uci:get(m.config, "global", "date_format") or "%F %R"
+local date_format = m.uci:get(m.config, "global", "date_format") or "%F %R"
 -- log directory
-log_dir = m.uci:get(m.config, "global", "log_dir") or "/var/log/ddns"
+local log_dir = m.uci:get(m.config, "global", "log_dir") or "/var/log/ddns"
 
 -- cbi-section definition -- ###################################################
-ns = m:section( NamedSection, section, "service",
+local ns = m:section( NamedSection, section, "service",
 	translate("Details for") .. ([[: <strong>%s</strong>]] % section),
-	translate("Configure here the details for selected Dynamic DNS service.")
-	.. [[<br /><a href="http://wiki.openwrt.org/doc/uci/ddns#version_1x" target="_blank">]]
-	.. translate("For detailed information about parameter settings look here.")
-	.. [[</a>]] )
+	translate("Configure here the details for selected Dynamic DNS service.") )
 ns.instance = section	-- arg [1]
 ns:tab("basic", translate("Basic Settings"), nil )
 ns:tab("advanced", translate("Advanced Settings"), nil )
@@ -146,17 +278,33 @@ ns:tab("timer", translate("Timer Settings"), nil )
 ns:tab("logview", translate("Log File Viewer"), nil )
 
 -- TAB: Basic  #####################################################################################
--- enabled  -- #################################################################
+-- enabled -- #################################################################
 en = ns:taboption("basic", Flag, "enabled",
 	translate("Enabled"),
 	translate("If this service section is disabled it could not be started." .. "<br />" ..
 		"Neither from LuCI interface nor from console") )
 en.orientation = "horizontal"
-function en.parse(self, section)
-	DDNS.flag_parse(self, section)
+
+-- IPv4/IPv6 - lookup_host -- #################################################
+luh = ns:taboption("basic", Value, "lookup_host",
+		translate("Lookup Hostname"),
+		translate("Hostname/FQDN to validate, if IP update happen or necessary") )
+luh.rmempty	= false
+luh.placeholder = "myhost.example.com"
+function luh.validate(self, value)
+	if not value
+	or not (#value > 0)
+	or not DTYP.hostname(value) then
+		return nil, err_tab_basic(self) .. translate("invalid FQDN / required - Sample") .. ": 'myhost.example.com'"
+	else
+		return UTIL.trim(value)
+	end
+end
+function luh.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
 end
 
--- use_ipv6 (NEW)  -- ##########################################################
+-- use_ipv6 -- ################################################################
 usev6 = ns:taboption("basic", ListValue, "use_ipv6",
 	translate("IP address version"),
 	translate("Defines which IP address 'IPv4/IPv6' is send to the DDNS provider") )
@@ -179,36 +327,15 @@ function usev6.validate(self, value)
 	end
 	return nil, err_tab_basic(self) .. err_ipv6_plain
 end
-function usev6.write(self, section, value)
-	if value == "0" then	-- force rmempty
-		return self.map:del(section, self.option)
-	else
-		return self.map:set(section, self.option, value)
-	end
+function usev6.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
 end
 
--- IPv4 - service_name -- ######################################################
+-- IPv4 - service_name -- #####################################################
 svc4 = ns:taboption("basic", ListValue, "ipv4_service_name",
 	translate("DDNS Service provider") .. " [IPv4]" )
 svc4.default	= "-"
 svc4:depends("use_ipv6", "0")	-- only show on IPv4
-
-local services4 = { }
-local fd4 = io.open("/usr/lib/ddns/services", "r")
-
-if fd4 then
-	local ln
-	repeat
-		ln = fd4:read("*l")
-		local s = ln and ln:match('^%s*"([^"]+)"')
-		if s then services4[#services4+1] = s end
-	until not ln
-	fd4:close()
-end
-
-for _, v in UTIL.vspairs(services4) do svc4:value(v) end
-svc4:value("-", translate("-- custom --") )
-
 function svc4.cfgvalue(self, section)
 	local v =  DDNS.read_value(self, section, "service_name")
 	if not v or #v == 0 then
@@ -229,14 +356,18 @@ function svc4.write(self, section, value)
 		self.map:del(section, self.option)	-- to be shure
 		if value ~= "-" then			-- and write "service_name
 			self.map:del(section, "update_url")	-- delete update_url
+			self.map:del(section, "update_script")	-- delete update_script
 			return self.map:set(section, "service_name", value)
 		else
 			return self.map:del(section, "service_name")
 		end
 	end
 end
+function svc4.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv6 - service_name -- ######################################################
+-- IPv6 - service_name -- #####################################################
 svc6 = ns:taboption("basic", ListValue, "ipv6_service_name",
 	translate("DDNS Service provider") .. " [IPv6]" )
 svc6.default	= "-"
@@ -244,23 +375,6 @@ svc6:depends("use_ipv6", "1")	-- only show on IPv6
 if not has_ipv6 then
 	svc6.description = err_ipv6_basic
 end
-
-local services6 = { }
-local fd6 = io.open("/usr/lib/ddns/services_ipv6", "r")
-
-if fd6 then
-	local ln
-	repeat
-		ln = fd6:read("*l")
-		local s = ln and ln:match('^%s*"([^"]+)"')
-		if s then services6[#services6+1] = s end
-	until not ln
-	fd6:close()
-end
-
-for _, v in UTIL.vspairs(services6) do svc6:value(v) end
-svc6:value("-", translate("-- custom --") )
-
 function svc6.cfgvalue(self, section)
 	local v =  DDNS.read_value(self, section, "service_name")
 	if not v or #v == 0 then
@@ -282,33 +396,42 @@ function svc6.write(self, section, value)
 		self.map:del(section, self.option)	-- delete "ipv6_service_name" helper
 		if value ~= "-" then			-- and write "service_name
 			self.map:del(section, "update_url")	-- delete update_url
+			self.map:del(section, "update_script")	-- delete update_script
 			return self.map:set(section, "service_name", value)
 		else
 			return self.map:del(section, "service_name")
 		end
 	end
 end
+function svc6.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
+
+-- IPv4/IPv6 - change Provider -- #############################################
+svs		= ns:taboption("basic", Button, "_switch")
+svs.title      = translate("Really change DDNS provider?")
+svs.inputtitle = translate("Change provider")
+svs.inputstyle = "apply"
 
--- IPv4/IPv6 - update_url -- ###################################################
+-- IPv4/IPv6 - update_url -- ##################################################
 uurl = ns:taboption("basic", Value, "update_url",
 	translate("Custom update-URL"),
 	translate("Update URL to be used for updating your DDNS Provider." .. "<br />" ..
 		"Follow instructions you will find on their WEB page.") )
-uurl:depends("ipv4_service_name", "-")
-uurl:depends("ipv6_service_name", "-")
 function uurl.validate(self, value)
-	local script = ush:formvalue(section)
+	local fush   = ush:formvalue(section)
+	local fusev6 = usev6:formvalue(section)
 
-	if (usev6:formvalue(section) == "0" and svc4:formvalue(section) ~= "-") or
-	   (usev6:formvalue(section) == "1" and svc6:formvalue(section) ~= "-") then
+	if (fusev6 == "0" and svc4:formvalue(section) ~= "-") or
+	   (fusev6 == "1" and svc6:formvalue(section) ~= "-") then
 		return ""	-- suppress validate error
 	elseif not value then
-		if not script or not (#script > 0) then
+		if not fush or (#fush == 0) then
 			return nil, err_tab_basic(self) .. translate("missing / required")
 		else
 			return ""	-- suppress validate error / update_script is given
 		end
-	elseif (#script > 0) then
+	elseif (#fush > 0) then
 		return nil, err_tab_basic(self) .. translate("either url or script could be set")
 	end
 
@@ -325,80 +448,159 @@ function uurl.validate(self, value)
 
 	return value
 end
+function uurl.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv4/IPv6 - update_script -- ################################################
+-- IPv4/IPv6 - update_script -- ###############################################
 ush = ns:taboption("basic", Value, "update_script",
 	translate("Custom update-script"),
 	translate("Custom update script to be used for updating your DDNS Provider.") )
-ush:depends("ipv4_service_name", "-")
-ush:depends("ipv6_service_name", "-")
 function ush.validate(self, value)
-	local url = uurl:formvalue(section)
+	local fuurl  = uurl:formvalue(section)
+	local fusev6 = usev6:formvalue(section)
 
-	if (usev6:formvalue(section) == "0" and svc4:formvalue(section) ~= "-") or
-	   (usev6:formvalue(section) == "1" and svc6:formvalue(section) ~= "-") then
+	if (fusev6 == "0" and svc4:formvalue(section) ~= "-") or
+	   (fusev6 == "1" and svc6:formvalue(section) ~= "-") then
 		return ""	-- suppress validate error
 	elseif not value then
-		if not url or not (#url > 0) then
+		if not fuurl or (#fuurl == 0) then
 			return nil, err_tab_basic(self) .. translate("missing / required")
 		else
 			return ""	-- suppress validate error / update_url is given
 		end
-	elseif (#url > 0) then
+	elseif (#fuurl > 0) then
 		return nil, err_tab_basic(self) .. translate("either url or script could be set")
 	elseif not NXFS.access(value) then
 		return nil, err_tab_basic(self) .. translate("File not found")
 	end
 	return value
 end
+function ush.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv4/IPv6 - domain -- #######################################################
+-- IPv4/IPv6 - domain -- ######################################################
 dom = ns:taboption("basic", Value, "domain",
-		translate("Hostname/Domain"),
+		translate("Domain"),
 		translate("Replaces [DOMAIN] in Update-URL") )
-dom.rmempty	= false
-dom.placeholder	= "mypersonaldomain.dyndns.org"
+dom.placeholder = "myhost.example.com"
 function dom.validate(self, value)
-	if not value
-	or not (#value > 0)
-	or not DTYP.hostname(value) then
-		return nil, err_tab_basic(self) ..	translate("invalid - Sample") .. ": 'mypersonaldomain.dyndns.org'"
-	else
-		return value
-	end
+	return _option_validate(self, value)
+end
+function dom.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
 end
 
--- IPv4/IPv6 - username -- #####################################################
+-- IPv4/IPv6 - username -- ####################################################
 user = ns:taboption("basic", Value, "username",
 		translate("Username"),
-		translate("Replaces [USERNAME] in Update-URL") )
-user.rmempty = false
+		translate("Replaces [USERNAME] in Update-URL (URL-encoded)") )
 function user.validate(self, value)
-	if not value then
-		return nil, err_tab_basic(self) .. translate("missing / required")
-	end
-	return value
+	return _option_validate(self, value)
+end
+function user.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
 end
 
--- IPv4/IPv6 - password -- #####################################################
+-- IPv4/IPv6 - password -- ####################################################
 pw = ns:taboption("basic", Value, "password",
 		translate("Password"),
-		translate("Replaces [PASSWORD] in Update-URL") )
-pw.rmempty  = false
+		translate("Replaces [PASSWORD] in Update-URL (URL-encoded)") )
 pw.password = true
 function pw.validate(self, value)
-	if not value then
-		return nil, err_tab_basic(self) .. translate("missing / required")
+	return _option_validate(self, value)
+end
+function pw.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
+
+-- IPv4/IPv6 - param_enc -- ###################################################
+pe = ns:taboption("basic", Value, "param_enc",
+		translate("Optional Encoded Parameter"),
+		translate("Optional: Replaces [PARAMENC] in Update-URL (URL-encoded)") )
+function pe.validate(self, value)
+	return _option_validate(self, value)
+end
+function pe.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
+
+-- IPv4/IPv6 - param_enc -- ###################################################
+po = ns:taboption("basic", Value, "param_opt",
+		translate("Optional Parameter"),
+		translate("Optional: Replaces [PARAMOPT] in Update-URL (NOT URL-encoded)") )
+function po.validate(self, value)
+	return _option_validate(self, value)
+end
+function po.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
+
+-- handled service dependent show/display -- ##################################
+-- IPv4 --
+local cv4 = svc4:cfgvalue(section)
+if cv4 ~= "-" then
+	svs:depends ("ipv4_service_name", "-" )	-- show only if "-"
+	ush:depends ("ipv4_service_name", "?")
+	uurl:depends("ipv4_service_name", "?")
+else
+	uurl:depends("ipv4_service_name", "-")
+	ush:depends ("ipv4_service_name", "-")
+	dom:depends("ipv4_service_name", "-" )
+	user:depends("ipv4_service_name", "-" )
+	pw:depends("ipv4_service_name", "-" )
+	pe:depends("ipv4_service_name", "-" )
+	po:depends("ipv4_service_name", "-" )
+end
+for s, u in UTIL.kspairs(services4) do
+	svc4:value(s)	-- fill DropDown-List
+	if cv4 ~= s then
+		svs:depends("ipv4_service_name", s )
+	else
+		dom:depends ("ipv4_service_name", ((_option_used(dom.option, u) == 1) and s or "?") )
+		user:depends("ipv4_service_name", ((_option_used(user.option, u) == 1) and s or "?") )
+		pw:depends  ("ipv4_service_name", ((_option_used(pw.option, u) == 1) and s or "?") )
+		pe:depends  ("ipv4_service_name", ((_option_used(pe.option, u) == 1) and s or "?") )
+		po:depends  ("ipv4_service_name", ((_option_used(po.option, u) == 1) and s or "?") )
 	end
-	return value
 end
+svc4:value("-", translate("-- custom --") )
+
+-- IPv6 --
+local cv6 = svc6:cfgvalue(section)
+if cv6 ~= "-" then
+	svs:depends ("ipv6_service_name", "-" )
+	uurl:depends("ipv6_service_name", "?")
+	ush:depends ("ipv6_service_name", "?")
+else
+	uurl:depends("ipv6_service_name", "-")
+	ush:depends ("ipv6_service_name", "-")
+	dom:depends("ipv6_service_name", "-" )
+	user:depends("ipv6_service_name", "-" )
+	pw:depends("ipv6_service_name", "-" )
+	pe:depends("ipv6_service_name", "-" )
+	po:depends("ipv6_service_name", "-" )
+end
+for s, u in UTIL.kspairs(services6) do
+	svc6:value(s)	-- fill DropDown-List
+	if cv6 ~= s then
+		svs:depends("ipv6_service_name", s )
+	else
+		dom:depends ("ipv6_service_name", ((_option_used(dom.option, u) == 1) and s or "?") )
+		user:depends("ipv6_service_name", ((_option_used(user.option, u) == 1) and s or "?") )
+		pw:depends  ("ipv6_service_name", ((_option_used(pw.option, u) == 1) and s or "?") )
+		pe:depends  ("ipv6_service_name", ((_option_used(pe.option, u) == 1) and s or "?") )
+		po:depends  ("ipv6_service_name", ((_option_used(po.option, u) == 1) and s or "?") )
+	end
+end
+svc6:value("-", translate("-- custom --") )
 
--- IPv4/IPv6 - use_https (NEW) -- ##############################################
+-- IPv4/IPv6 - use_https -- ###################################################
 if has_ssl or ( ( m:get(section, "use_https") or "0" ) == "1" ) then
 	https = ns:taboption("basic", Flag, "use_https",
 		translate("Use HTTP Secure") )
 	https.orientation = "horizontal"
-	https.rmempty = false -- force validate function
 	function https.cfgvalue(self, section)
 		local value = AbstractValue.cfgvalue(self, section)
 		if not has_ssl and value == "1" then
@@ -410,9 +612,6 @@ if has_ssl or ( ( m:get(section, "use_https") or "0" ) == "1" ) then
 		end
 		return value
 	end
-	function https.parse(self, section)
-		DDNS.flag_parse(self, section)
-	end
 	function https.validate(self, value)
 		if (value == "1" and has_ssl ) or value == "0" then return value end
 		return nil, err_tab_basic(self) .. translate("HTTPS not supported") .. " !"
@@ -427,7 +626,7 @@ if has_ssl or ( ( m:get(section, "use_https") or "0" ) == "1" ) then
 	end
 end
 
--- IPv4/IPv6 - cacert (NEW) -- #################################################
+-- IPv4/IPv6 - cacert -- ######################################################
 if has_ssl then
 	cert = ns:taboption("basic", Value, "cacert",
 		translate("Path to CA-Certificate"),
@@ -435,8 +634,8 @@ if has_ssl then
 		translate("or") .. bold_on .. " IGNORE " .. bold_off ..
 		translate("to run HTTPS without verification of server certificates (insecure)") )
 	cert:depends("use_https", "1")
-	cert.rmempty = false -- force validate function
 	cert.default = "/etc/ssl/certs"
+	cert.forcewrite = true
 	function cert.validate(self, value)
 		if https:formvalue(section) == "0" then
 			return ""	-- supress validate error if NOT https
@@ -451,10 +650,13 @@ if has_ssl then
 		return nil, err_tab_basic(self) ..
 			translate("file or directory not found or not 'IGNORE'") .. " !"
 	end
+	function cert.parse(self, section, novld)
+		DDNS.value_parse(self, section, novld)
+	end
 end
 
--- TAB: Advanced  ##################################################################################
--- IPv4 - ip_source -- #########################################################
+-- TAB: Advanced  #################################################################################
+-- IPv4 - ip_source -- ########################################################
 src4 = ns:taboption("advanced", ListValue, "ipv4_source",
 	translate("IP address source") .. " [IPv4]",
 	translate("Defines the source to read systems IPv4-Address from, that will be send to the DDNS provider") )
@@ -500,8 +702,11 @@ function src4.write(self, section, value)
 	self.map:del(section, self.option)		 -- delete "ipv4_source" helper
 	return self.map:set(section, "ip_source", value) -- and write "ip_source
 end
+function src4.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv6 - ip_source -- #########################################################
+-- IPv6 - ip_source -- ########################################################
 src6 = ns:taboption("advanced", ListValue, "ipv6_source",
 	translate("IP address source") .. " [IPv6]",
 	translate("Defines the source to read systems IPv6-Address from, that will be send to the DDNS provider") )
@@ -552,8 +757,11 @@ function src6.write(self, section, value)
 	self.map:del(section, self.option)		 -- delete "ipv4_source" helper
 	return self.map:set(section, "ip_source", value) -- and write "ip_source
 end
+function src6.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv4 - ip_network (default "wan") -- ########################################
+-- IPv4 - ip_network (default "wan") -- #######################################
 ipn4 = ns:taboption("advanced", ListValue, "ipv4_network",
 	translate("Network") .. " [IPv4]",
 	translate("Defines the network to read systems IPv4-Address from") )
@@ -586,8 +794,11 @@ function ipn4.write(self, section, value)
 		return self.map:set(section, "ip_network", value) -- and write "ip_network"
 	end
 end
+function ipn4.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv6 - ip_network (default "wan6") -- #######################################
+-- IPv6 - ip_network (default "wan6") -- ######################################
 ipn6 = ns:taboption("advanced", ListValue, "ipv6_network",
 	translate("Network") .. " [IPv6]" )
 ipn6:depends("ipv6_source", "network")
@@ -626,8 +837,11 @@ function ipn6.write(self, section, value)
 		return self.map:set(section, "ip_network", value) -- and write "ip_network"
 	end
 end
+function ipn6.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv4 - ip_url (default "checkip.dyndns.com") -- #############################
+-- IPv4 - ip_url (default "checkip.dyndns.com") -- ############################
 iurl4 = ns:taboption("advanced", Value, "ipv4_url",
 	translate("URL to detect") .. " [IPv4]",
 	translate("Defines the Web page to read systems IPv4-Address from") )
@@ -668,8 +882,11 @@ function iurl4.write(self, section, value)
 		return self.map:set(section, "ip_url", value)	-- and write "ip_url"
 	end
 end
+function iurl4.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv6 - ip_url (default "checkipv6.dyndns.com") -- ###########################
+-- IPv6 - ip_url (default "checkipv6.dyndns.com") -- ##########################
 iurl6 = ns:taboption("advanced", Value, "ipv6_url",
 	translate("URL to detect") .. " [IPv6]" )
 iurl6:depends("ipv6_source", "web")
@@ -716,8 +933,11 @@ function iurl6.write(self, section, value)
 		return self.map:set(section, "ip_url", value)	-- and write "ip_url"
 	end
 end
+function iurl6.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv4 + IPv6 - ip_interface -- ###############################################
+-- IPv4 + IPv6 - ip_interface -- ##############################################
 ipi = ns:taboption("advanced", ListValue, "ip_interface",
 	translate("Interface"),
 	translate("Defines the interface to read systems IP-Address from") )
@@ -732,16 +952,18 @@ for _, v in pairs(SYS.net.devices()) do
 	end
 end
 function ipi.validate(self, value)
-	if (usev6:formvalue(section) == "0" and src4:formvalue(section) ~= "interface")
-	or (usev6:formvalue(section) == "1" and src6:formvalue(section) ~= "interface") then
+	local fusev6 = usev6:formvalue(section)
+	if (fusev6 == "0" and src4:formvalue(section) ~= "interface")
+	or (fusev6 == "1" and src6:formvalue(section) ~= "interface") then
 		return ""
 	else
 		return value
 	end
 end
 function ipi.write(self, section, value)
-	if (usev6:formvalue(section) == "0" and src4:formvalue(section) ~= "interface")
-	or (usev6:formvalue(section) == "1" and src6:formvalue(section) ~= "interface") then
+	local fusev6 = usev6:formvalue(section)
+	if (fusev6 == "0" and src4:formvalue(section) ~= "interface")
+	or (fusev6 == "1" and src6:formvalue(section) ~= "interface") then
 		return true
 	else
 		-- get network from device to
@@ -751,21 +973,24 @@ function ipi.write(self, section, value)
 		return self.map:set(section, self.option, value)
 	end
 end
+function ipi.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv4 + IPv6 - ip_script (NEW) -- ############################################
+-- IPv4 + IPv6 - ip_script -- #################################################
 ips = ns:taboption("advanced", Value, "ip_script",
 	translate("Script"),
 	translate("User defined script to read systems IP-Address") )
 ips:depends("ipv4_source", "script")	-- IPv4
 ips:depends("ipv6_source", "script")	-- or IPv6
-ips.rmempty	= false
 ips.placeholder = "/path/to/script.sh"
 function ips.validate(self, value)
+	local fusev6 = usev6:formvalue(section)
 	local split
 	if value then split = UTIL.split(value, " ") end
 
-	if (usev6:formvalue(section) == "0" and src4:formvalue(section) ~= "script")
-	or (usev6:formvalue(section) == "1" and src6:formvalue(section) ~= "script") then
+	if (fusev6 == "0" and src4:formvalue(section) ~= "script")
+	or (fusev6 == "1" and src6:formvalue(section) ~= "script") then
 		return ""
 	elseif not value or not (#value > 0) or not NXFS.access(split[1], "x") then
 		return nil, err_tab_adv(self) ..
@@ -775,15 +1000,19 @@ function ips.validate(self, value)
 	end
 end
 function ips.write(self, section, value)
-	if (usev6:formvalue(section) == "0" and src4:formvalue(section) ~= "script")
-	or (usev6:formvalue(section) == "1" and src6:formvalue(section) ~= "script") then
+	local fusev6 = usev6:formvalue(section)
+	if (fusev6 == "0" and src4:formvalue(section) ~= "script")
+	or (fusev6 == "1" and src6:formvalue(section) ~= "script") then
 		return true
 	else
 		return self.map:set(section, self.option, value)
 	end
 end
+function ips.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv4 - interface - default "wan" -- #########################################
+-- IPv4 - interface - default "wan" -- ########################################
 -- event network to monitor changes/hotplug/dynamic_dns_updater.sh
 -- only needs to be set if "ip_source"="web" or "script"
 -- if "ip_source"="network" or "interface" we use their network
@@ -798,27 +1027,32 @@ function eif4.cfgvalue(self, section)
 	return DDNS.read_value(self, section, "interface")
 end
 function eif4.validate(self, value)
+	local fsrc4 = src4:formvalue(section)
 	if usev6:formvalue(section) == "1"
-	 or src4:formvalue(section) == "network"
-	 or src4:formvalue(section) == "interface" then
+	 or fsrc4 == "network"
+	 or fsrc4 == "interface" then
 		return ""	-- ignore IPv6, network, interface
 	else
 		return value
 	end
 end
 function eif4.write(self, section, value)
+	local fsrc4 = src4:formvalue(section)
 	if usev6:formvalue(section) == "1"
-	 or src4:formvalue(section) == "network"
-	 or src4:formvalue(section) == "interface" then
+	 or fsrc4 == "network"
+	 or fsrc4 == "interface" then
 		return true	-- ignore IPv6, network, interface
 	else
 		self.map:del(section, self.option)		 -- delete "ipv4_interface" helper
 		return self.map:set(section, "interface", value) -- and write "interface"
 	end
 end
+function eif4.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv6 - interface (NEW) - default "wan6" -- ##################################
--- event network to monitor changes/hotplug (NEW)
+-- IPv6 - interface - default "wan6" -- #######################################
+-- event network to monitor changes/hotplug
 -- only needs to be set if "ip_source"="web" or "script"
 -- if "ip_source"="network" or "interface" we use their network
 eif6 = ns:taboption("advanced", ListValue, "ipv6_interface",
@@ -836,9 +1070,10 @@ function eif6.cfgvalue(self, section)
 	return DDNS.read_value(self, section, "interface")
 end
 function eif6.validate(self, value)
+	local fsrc6 = src6:formvalue(section)
 	if usev6:formvalue(section) == "0"
-	 or src4:formvalue(section) == "network"
-	 or src4:formvalue(section) == "interface" then
+	 or fsrc6 == "network"
+	 or fsrc6 == "interface" then
 		return ""	-- ignore IPv4, network, interface
 	elseif not has_ipv6 then
 		return nil, err_tab_adv(self) .. err_ipv6_plain
@@ -847,23 +1082,26 @@ function eif6.validate(self, value)
 	end
 end
 function eif6.write(self, section, value)
+	local fsrc6 = src6:formvalue(section)
 	if usev6:formvalue(section) == "0"
-	 or src4:formvalue(section) == "network"
-	 or src4:formvalue(section) == "interface" then
+	 or fsrc6 == "network"
+	 or fsrc6 == "interface" then
 		return true	-- ignore IPv4, network, interface
 	else
 		self.map:del(section, self.option)		 -- delete "ipv6_interface" helper
 		return self.map:set(section, "interface", value) -- and write "interface"
 	end
 end
+function eif6.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv4/IPv6 - bind_network -- #################################################
+-- IPv4/IPv6 - bind_network -- ################################################
 if has_ssl or ( ( m:get(section, "bind_network") or "" ) ~= "" ) then
 	bnet = ns:taboption("advanced", ListValue, "bind_network",
 		translate("Bind Network") )
 	bnet:depends("ipv4_source", "web")
 	bnet:depends("ipv6_source", "web")
-	bnet.rmempty = true
 	bnet.default = ""
 	bnet:value("", translate("-- default --"))
 	WADM.cbi_add_networks(bnet)
@@ -883,9 +1121,12 @@ if has_ssl or ( ( m:get(section, "bind_network") or "" ) ~= "" ) then
 		if (value ~= "" and has_ssl ) or value == "" then return value end
 		return nil, err_tab_adv(self) .. translate("Binding to a specific network not supported") .. " !"
 	end
+	function bnet.parse(self, section, novld)
+		DDNS.value_parse(self, section, novld)
+	end
 end
 
--- IPv4 + IPv6 - force_ipversion (NEW) -- ######################################
+-- IPv4 + IPv6 - force_ipversion -- ###########################################
 -- optional to force wget/curl and host to use only selected IP version
 -- command parameter "-4" or "-6"
 if has_force or ( ( m:get(section, "force_ipversion") or "0" ) ~= "0" ) then
@@ -907,19 +1148,9 @@ if has_force or ( ( m:get(section, "force_ipversion") or "0" ) ~= "0" ) then
 		if (value == "1" and has_force) or value == "0" then return value end
 		return nil, err_tab_adv(self) .. translate("Force IP Version not supported")
 	end
-	function fipv.parse(self, section)
-		DDNS.flag_parse(self, section)
-	end
-	function fipv.write(self, section, value)
-		if value == "1" then
-			return self.map:set(section, self.option, value)
-		else
-			return self.map:del(section, self.option)
-		end
-	end
 end
 
--- IPv4 + IPv6 - dns_server (NEW) -- ###########################################
+-- IPv4 + IPv6 - dns_server -- ################################################
 -- optional DNS Server to use resolving my IP if "ip_source"="web"
 dns = ns:taboption("advanced", Value, "dns_server",
 	translate("DNS-Server"),
@@ -928,7 +1159,7 @@ dns = ns:taboption("advanced", Value, "dns_server",
 dns.placeholder = "mydns.lan"
 function dns.validate(self, value)
 	-- if .datatype is set, then it is checked before calling this function
-	if not value then
+	if not value or (#value == 0) then
 		return ""	-- ignore on empty
 	elseif not DTYP.host(value) then
 		return nil, err_tab_adv(self) .. translate("use hostname, FQDN, IPv4- or IPv6-Address")
@@ -946,8 +1177,11 @@ function dns.validate(self, value)
 		end
 	end
 end
+function dns.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- IPv4 + IPv6 - force_dnstcp (NEW) -- #########################################
+-- IPv4 + IPv6 - force_dnstcp -- ##############################################
 if has_dnstcp or ( ( m:get(section, "force_dnstcp") or "0" ) ~= "0" ) then
 	tcp = ns:taboption("advanced", Flag, "force_dnstcp",
 		translate("Force TCP on DNS") )
@@ -969,12 +1203,9 @@ if has_dnstcp or ( ( m:get(section, "force_dnstcp") or "0" ) ~= "0" ) then
 		end
 		return nil, err_tab_adv(self) .. translate("DNS requests via TCP not supported")
 	end
-	function tcp.parse(self, section)
-		DDNS.flag_parse(self, section)
-	end
 end
 
--- IPv4 + IPv6 - proxy (NEW) -- ################################################
+-- IPv4 + IPv6 - proxy -- #####################################################
 -- optional Proxy to use for http/https requests  [user:password@]proxyhost[:port]
 if has_proxy or ( ( m:get(section, "proxy") or "" ) ~= "" ) then
 	pxy = ns:taboption("advanced", Value, "proxy",
@@ -996,7 +1227,7 @@ if has_proxy or ( ( m:get(section, "proxy") or "" ) ~= "" ) then
 	end
 	function pxy.validate(self, value)
 		-- if .datatype is set, then it is checked before calling this function
-		if not value then
+		if not value or (#value == 0) then
 			return ""	-- ignore on empty
 		elseif has_proxy then
 			local ipv6  = usev6:formvalue(section) or "0"
@@ -1015,9 +1246,12 @@ if has_proxy or ( ( m:get(section, "proxy") or "" ) ~= "" ) then
 			return nil, err_tab_adv(self) .. translate("PROXY-Server not supported")
 		end
 	end
+	function pxy.parse(self, section, novld)
+		DDNS.value_parse(self, section, novld)
+	end
 end
 
--- use_syslog -- ###############################################################
+-- use_syslog -- ##############################################################
 slog = ns:taboption("advanced", ListValue, "use_syslog",
 	translate("Log to syslog"),
 	translate("Writes log messages to syslog. Critical Errors will always be written to syslog.") )
@@ -1027,26 +1261,24 @@ slog:value("1", translate("Info"))
 slog:value("2", translate("Notice"))
 slog:value("3", translate("Warning"))
 slog:value("4", translate("Error"))
+function slog.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- use_logfile (NEW) -- ########################################################
+-- use_logfile -- #############################################################
 logf = ns:taboption("advanced", Flag, "use_logfile",
 	translate("Log to file"),
 	translate("Writes detailed messages to log file. File will be truncated automatically.") .. "<br />" ..
 	translate("File") .. [[: "]] .. log_dir .. [[/]] .. section .. [[.log"]] )
 logf.orientation = "horizontal"
-logf.rmempty = false	-- we want to save in /etc/config/ddns file on "0" because
-logf.default = "1"	-- if not defined write to log by default
-function logf.parse(self, section)
-	DDNS.flag_parse(self, section)
-end
+logf.default     = "1"		-- if not defined write to log by default
 
--- TAB: Timer  #####################################################################################
--- check_interval -- ###########################################################
+-- TAB: Timer  ####################################################################################
+-- check_interval -- ##########################################################
 ci = ns:taboption("timer", Value, "check_interval",
 	translate("Check Interval") )
 ci.template = "ddns/detail_value"
-ci.default  = 10
-ci.rmempty = false	-- validate ourselves for translatable error messages
+ci.default  = "10"
 function ci.validate(self, value)
 	if not DTYP.uinteger(value)
 	or tonumber(value) < 1 then
@@ -1061,7 +1293,7 @@ function ci.validate(self, value)
 	end
 end
 function ci.write(self, section, value)
-	-- simulate rmempty=true remove default
+	-- remove when default
 	local secs = DDNS.calc_seconds(value, cu:formvalue(section))
 	if secs ~= 600 then	--default 10 minutes
 		return self.map:set(section, self.option, value)
@@ -1070,20 +1302,22 @@ function ci.write(self, section, value)
 		return self.map:del(section, self.option)
 	end
 end
+function ci.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- check_unit -- ###############################################################
+-- check_unit -- ##############################################################
 cu = ns:taboption("timer", ListValue, "check_unit", "not displayed, but needed otherwise error",
 	translate("Interval to check for changed IP" .. "<br />" ..
 		"Values below 5 minutes == 300 seconds are not supported") )
 cu.template = "ddns/detail_lvalue"
 cu.default  = "minutes"
-cu.rmempty  = false	-- want to control write process
 cu:value("seconds", translate("seconds"))
 cu:value("minutes", translate("minutes"))
 cu:value("hours", translate("hours"))
 --cu:value("days", translate("days"))
 function cu.write(self, section, value)
-	-- simulate rmempty=true remove default
+	-- remove when default
 	local secs = DDNS.calc_seconds(ci:formvalue(section), value)
 	if secs ~= 600 then	--default 10 minutes
 		return self.map:set(section, self.option, value)
@@ -1091,13 +1325,16 @@ function cu.write(self, section, value)
 		return true
 	end
 end
+function cu.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- force_interval (modified) -- ################################################
+-- force_interval (modified) -- ###############################################
 fi = ns:taboption("timer", Value, "force_interval",
 	translate("Force Interval") )
 fi.template = "ddns/detail_value"
-fi.default  = 72 	-- see dynamic_dns_updater.sh script
-fi.rmempty = false	-- validate ourselves for translatable error messages
+fi.default  = "72" 	-- see dynamic_dns_updater.sh script
+--fi.rmempty = false	-- validate ourselves for translatable error messages
 function fi.validate(self, value)
 	if not DTYP.uinteger(value)
 	or tonumber(value) < 0 then
@@ -1131,15 +1368,18 @@ function fi.write(self, section, value)
 		return self.map:del(section, self.option)
 	end
 end
+function fi.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- force_unit -- ###############################################################
+-- force_unit -- ##############################################################
 fu = ns:taboption("timer", ListValue, "force_unit", "not displayed, but needed otherwise error",
 	translate("Interval to force updates send to DDNS Provider" .. "<br />" ..
 		"Setting this parameter to 0 will force the script to only run once" .. "<br />" ..
 		"Values lower 'Check Interval' except '0' are not supported") )
 fu.template = "ddns/detail_lvalue"
 fu.default  = "hours"
-fu.rmempty  = false	-- want to control write process
+--fu.rmempty  = false	-- want to control write process
 --fu:value("seconds", translate("seconds"))
 fu:value("minutes", translate("minutes"))
 fu:value("hours", translate("hours"))
@@ -1153,15 +1393,17 @@ function fu.write(self, section, value)
 		return true
 	end
 end
+function fu.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- retry_count (NEW) -- ########################################################
+-- retry_count -- #############################################################
 rc = ns:taboption("timer", Value, "retry_count")
 rc.title	= translate("Error Retry Counter")
 rc.description	= translate("On Error the script will stop execution after given number of retrys")
 		.. "<br />"
 		.. translate("The default setting of '0' will retry infinite.")
-rc.default	= 0
-rc.rmempty	= false	-- validate ourselves for translatable error messages
+rc.default	= "0"
 function rc.validate(self, value)
 	if not DTYP.uinteger(value) then
 		return nil, err_tab_timer(self) .. translate("minimum value '0'")
@@ -1169,21 +1411,15 @@ function rc.validate(self, value)
 		return value
 	end
 end
-function rc.write(self, section, value)
-	-- simulate rmempty=true remove default
-	if tonumber(value) ~= self.default then
-		return self.map:set(section, self.option, value)
-	else
-		return self.map:del(section, self.option)
-	end
+function rc.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
 end
 
--- retry_interval -- ###########################################################
+-- retry_interval -- ##########################################################
 ri = ns:taboption("timer", Value, "retry_interval",
 	translate("Error Retry Interval") )
 ri.template = "ddns/detail_value"
-ri.default  = 60
-ri.rmempty  = false	-- validate ourselves for translatable error messages
+ri.default  = "60"
 function ri.validate(self, value)
 	if not DTYP.uinteger(value)
 	or tonumber(value) < 1 then
@@ -1202,13 +1438,16 @@ function ri.write(self, section, value)
 		return self.map:del(section, self.option)
 	end
 end
+function ri.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- retry_unit -- ###############################################################
+-- retry_unit -- ##############################################################
 ru = ns:taboption("timer", ListValue, "retry_unit", "not displayed, but needed otherwise error",
 	translate("On Error the script will retry the failed action after given time") )
 ru.template = "ddns/detail_lvalue"
 ru.default  = "seconds"
-ru.rmempty  = false	-- want to control write process
+--ru.rmempty  = false	-- want to control write process
 ru:value("seconds", translate("seconds"))
 ru:value("minutes", translate("minutes"))
 --ru:value("hours", translate("hours"))
@@ -1222,8 +1461,11 @@ function ru.write(self, section, value)
 		return true -- will be deleted by retry_interval
 	end
 end
+function ru.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
--- TAB: LogView  (NEW) #############################################################################
+-- TAB: LogView  ##################################################################################
 lv = ns:taboption("logview", DummyValue, "_logview")
 lv.template = "ddns/detail_logview"
 lv.inputtitle = translate("Read / Reread log file")
diff --git a/applications/luci-app-ddns/luasrc/model/cbi/ddns/global.lua b/applications/luci-app-ddns/luasrc/model/cbi/ddns/global.lua
index 25d09b73b..23ce4f13f 100644
--- a/applications/luci-app-ddns/luasrc/model/cbi/ddns/global.lua
+++ b/applications/luci-app-ddns/luasrc/model/cbi/ddns/global.lua
@@ -5,18 +5,14 @@ local NX   = require "nixio"
 local NXFS = require "nixio.fs"
 local DISP = require "luci.dispatcher"
 local SYS  = require "luci.sys"
+local CTRL = require "luci.controller.ddns"	-- this application's controller
 local DDNS = require "luci.tools.ddns"		-- ddns multiused functions
 
 -- cbi-map definition -- #######################################################
 local m = Map("ddns")
-
-m.title = [[<a href="]] .. DISP.build_url("admin", "services", "ddns") .. [[">]] 
-	.. translate("Dynamic DNS") .. [[</a>]]
-
-m.description = translate("Dynamic DNS allows that your router can be reached with " ..
-			"a fixed hostname while having a dynamically changing IP address.")
-
-m.redirect = DISP.build_url("admin", "services", "ddns")
+m.title		= CTRL.app_title_back()
+m.description	= CTRL.app_description()
+m.redirect	= DISP.build_url("admin", "services", "ddns")
 
 function m.commit_handler(self)
 	if self.changed then	-- changes ?
@@ -52,17 +48,7 @@ ali.description = translate("Non-public and by default blocked IP's") .. ":"
 		.. "0/8, 10/8, 100.64/10, 127/8, 169.254/16, 172.16/12, 192.168/16"
 		.. [[<br /><strong>IPv6: </strong>]]
 		.. "::/32, f000::/4"
-ali.reempty	= true
 ali.default	= "0"
-function ali.parse(self, section)
-	DDNS.flag_parse(self, section)
-end
-function ali.validate(self, value)
-	if value == self.default then
-		return "" -- default = empty
-	end
-	return value
-end
 
 -- date_format  -- #############################################################
 local df	= ns:option(Value, "date_format")
@@ -71,7 +57,6 @@ df.description	= [[<a href="http://www.cplusplus.com/reference/ctime/strftime/"
 		.. translate("For supported codes look here") 
 		.. [[</a>]]
 df.template	= "ddns/global_value"
-df.rmempty	= true
 df.default	= "%F %R"
 df.date_string	= ""
 function df.cfgvalue(self, section)
@@ -80,55 +65,45 @@ function df.cfgvalue(self, section)
 	self.date_string = DDNS.epoch2date(epoch, value)
 	return value
 end
-function df.validate(self, value)
-	if value == self.default then
-		return "" -- default = empty
-	end
-	return value
+function df.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
 end
 
 -- run_dir  -- #################################################################
 local rd	= ns:option(Value, "run_dir")
 rd.title	= translate("Status directory")
 rd.description	= translate("Directory contains PID and other status information for each running section")
-rd.rmempty	= true
 rd.default	= "/var/run/ddns"
-function rd.validate(self, value)
-	if value == self.default then
-		return "" -- default = empty
-	end
-	return value
+-- no need to validate. if empty default is used everything else created by dns-scripts
+function rd.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
 end
 
 -- log_dir  -- #################################################################
 local ld	= ns:option(Value, "log_dir")
 ld.title	= translate("Log directory")
 ld.description	= translate("Directory contains Log files for each running section")
-ld.rmempty	= true
 ld.default	= "/var/log/ddns"
-function ld.validate(self, value)
-	if value == self.default then
-		return "" -- default = empty
-	end
-	return value
+-- no need to validate. if empty default is used everything else created by dns-scripts
+function ld.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
 end
 
 -- log_lines  -- ###############################################################
 local ll	= ns:option(Value, "log_lines")
 ll.title	= translate("Log length")
 ll.description	= translate("Number of last lines stored in log files")
-ll.rmempty	= true
 ll.default	= "250"
 function ll.validate(self, value)
 	local n = tonumber(value)
 	if not n or math.floor(n) ~= n or n < 1 then
 		return nil, self.title .. ": " .. translate("minimum value '1'")
 	end
-	if value == self.default then
-		return "" -- default = empty
-	end
 	return value
 end
+function ll.parse(self, section, novld)
+	DDNS.value_parse(self, section, novld)
+end
 
 -- use_curl  -- ################################################################
 if (SYS.call([[ grep -i "\+ssl" /usr/bin/wget >/dev/null 2>&1 ]]) == 0) 
@@ -139,17 +114,7 @@ and NXFS.access("/usr/bin/curl") then
 		.. [[<br />]]
 		.. translate("To use cURL activate this option.")
 	pc.orientation	= "horizontal"
-	pc.rmempty	= true
 	pc.default	= "0"
-	function pc.parse(self, section)
-		DDNS.flag_parse(self, section)
-	end
-	function pc.validate(self, value)
-		if value == self.default then
-			return "" -- default = empty
-		end
-		return value
-	end
 end
 
 return m
diff --git a/applications/luci-app-ddns/luasrc/model/cbi/ddns/hints.lua b/applications/luci-app-ddns/luasrc/model/cbi/ddns/hints.lua
index 2a65fd04f..031bf513c 100644
--- a/applications/luci-app-ddns/luasrc/model/cbi/ddns/hints.lua
+++ b/applications/luci-app-ddns/luasrc/model/cbi/ddns/hints.lua
@@ -1,9 +1,9 @@
 -- Copyright 2014 Christian Schoenebeck <christian dot schoenebeck at gmail dot com>
 -- Licensed to the public under the Apache License 2.0.
 
-local CTRL = require "luci.controller.ddns"	-- this application's controller
 local DISP = require "luci.dispatcher"
 local SYS  = require "luci.sys"
+local CTRL = require "luci.controller.ddns"	-- this application's controller
 local DDNS = require "luci.tools.ddns"		-- ddns multiused functions
 
 -- check supported options -- ##################################################
@@ -11,8 +11,6 @@ local DDNS = require "luci.tools.ddns"		-- ddns multiused functions
 has_ssl     = DDNS.check_ssl()		-- HTTPS support and --bind-network / --interface
 has_proxy   = DDNS.check_proxy()	-- Proxy support
 has_dnstcp  = DDNS.check_bind_host()	-- DNS TCP support
--- correct ddns-scripts version
-need_update = DDNS.ipkg_ver_compare(DDNS.ipkg_ver_installed("ddns-scripts"), "<<", CTRL.DDNS_MIN)
 
 -- html constants
 font_red = [[<font color="red">]]
@@ -22,15 +20,9 @@ bold_off = [[</strong>]]
 
 -- cbi-map definition -- #######################################################
 m = Map("ddns")
-
-m.title = [[<a href="]] .. DISP.build_url("admin", "services", "ddns") .. [[">]] ..
-		translate("Dynamic DNS") .. [[</a>]]
-
-m.description = translate("Dynamic DNS allows that your router can be reached with " ..
-			"a fixed hostname while having a dynamically changing " ..
-			"IP address.")
-
-m.redirect = DISP.build_url("admin", "services", "ddns")
+m.title		= CTRL.app_title_back()
+m.description	= CTRL.app_description()
+m.redirect	= DISP.build_url("admin", "services", "ddns")
 
 -- SimpleSection definition -- #################################################
 -- show Hints to optimize installation and script usage
@@ -39,7 +31,7 @@ s = m:section( SimpleSection,
 	translate("Below a list of configuration tips for your system to run Dynamic DNS updates without limitations") )
 
 -- ddns_scripts needs to be updated for full functionality
-if need_update then
+if not CTRL.service_ok() then
 	local dv = s:option(DummyValue, "_update_needed")
 	dv.titleref = DISP.build_url("admin", "system", "packages")
 	dv.rawhtml  = true
diff --git a/applications/luci-app-ddns/luasrc/model/cbi/ddns/overview.lua b/applications/luci-app-ddns/luasrc/model/cbi/ddns/overview.lua
index 5b5925b25..46fc0a4a2 100644
--- a/applications/luci-app-ddns/luasrc/model/cbi/ddns/overview.lua
+++ b/applications/luci-app-ddns/luasrc/model/cbi/ddns/overview.lua
@@ -2,10 +2,10 @@
 -- Licensed to the public under the Apache License 2.0.
 
 local NXFS = require "nixio.fs"
-local CTRL = require "luci.controller.ddns"	-- this application's controller
 local DISP = require "luci.dispatcher"
 local HTTP = require "luci.http"
 local SYS  = require "luci.sys"
+local CTRL = require "luci.controller.ddns"	-- this application's controller
 local DDNS = require "luci.tools.ddns"		-- ddns multiused functions
 
 -- show hints ?
@@ -15,7 +15,7 @@ show_hints = not (DDNS.check_ipv6()		-- IPv6 support
 		and DDNS.check_bind_host()	-- DNS TCP support
 		)
 -- correct ddns-scripts version
-need_update = DDNS.ipkg_ver_compare(DDNS.ipkg_ver_installed("ddns-scripts"), "<<", CTRL.DDNS_MIN)
+need_update = not CTRL.service_ok()
 
 -- html constants
 font_red = [[<font color="red">]]
@@ -25,22 +25,8 @@ bold_off = [[</strong>]]
 
 -- cbi-map definition -- #######################################################
 m = Map("ddns")
-
-m.title	= [[<a href="javascript:alert(']]
-		.. translate("Version Information")
-		.. [[\n\nluci-app-ddns]]
-		.. [[\n\t]] .. translate("Version") .. [[:\t]] .. DDNS.ipkg_ver_installed("luci-app-ddns")
-		.. [[\n\nddns-scripts ]] .. translate("required") .. [[:]]
-		.. [[\n\t]] .. translate("Version") .. [[:\t]] .. CTRL.DDNS_MIN .. [[ ]] .. translate("or higher")
-		.. [[\n\nddns-scripts ]] .. translate("installed") .. [[:]]
-		.. [[\n\t]] .. translate("Version") .. [[:\t]] .. DDNS.ipkg_ver_installed("ddns-scripts")
-		.. [[\n\n]]
-	.. [[')">]]
-	.. translate("Dynamic DNS") .. [[</a>]]
-
-m.description = translate("Dynamic DNS allows that your router can be reached with " ..
-			"a fixed hostname while having a dynamically changing " ..
-			"IP address.")
+m.title		= CTRL.app_title_main()
+m.description	= CTRL.app_description()
 
 m.on_after_commit = function(self)
 	if self.changed then	-- changes ?
@@ -122,21 +108,21 @@ function ts.create(self, name)
 	HTTP.redirect( self.extedit:format(name) )
 end
 
--- Domain and registered IP -- #################################################
-dom = ts:option(DummyValue, "_domainIP",
-	translate("Hostname/Domain") .. "<br />" .. translate("Registered IP") )
+-- Lookup_Host and registered IP -- #################################################
+dom = ts:option(DummyValue, "_lookupIP",
+	translate("Lookup Hostname") .. "<br />" .. translate("Registered IP") )
 dom.template = "ddns/overview_doubleline"
 function dom.set_one(self, section)
-	local domain = self.map:get(section, "domain") or ""
-	if domain ~= "" then
-		return domain
+	local lookup = self.map:get(section, "lookup_host") or ""
+	if lookup ~= "" then
+		return lookup
 	else
 		return [[<em>]] .. translate("config error") .. [[</em>]]
 	end
 end
 function dom.set_two(self, section)
-	local domain = self.map:get(section, "domain") or ""
-	if domain == "" then return "" end
+	local lookup = self.map:get(section, "lookup_host") or ""
+	if lookup == "" then return "" end
 	local dnsserver = self.map:get(section, "dnsserver") or ""
 	local use_ipv6 = tonumber(self.map:get(section, "use_ipv6") or 0)
 	local force_ipversion = tonumber(self.map:get(section, "force_ipversion") or 0)
@@ -145,7 +131,7 @@ function dom.set_two(self, section)
 	if not NXFS.access(command, "rwx", "rx", "rx") then
 		NXFS.chmod(command, 755)
 	end
-	command = command .. [[ get_registered_ip ]] .. domain .. [[ ]] .. use_ipv6 ..
+	command = command .. [[ get_registered_ip ]] .. lookup .. [[ ]] .. use_ipv6 ..
 		[[ ]] .. force_ipversion .. [[ ]] .. force_dnstcp .. [[ ]] .. dnsserver
 	local ip = SYS.exec(command)
 	if ip == "" then ip = translate("no data") end
@@ -157,9 +143,6 @@ ena = ts:option( Flag, "enabled",
 	translate("Enabled"))
 ena.template = "ddns/overview_enabled"
 ena.rmempty = false
-function ena.parse(self, section)
-	DDNS.flag_parse(self, section)
-end
 
 -- show PID and next update
 upd = ts:option( DummyValue, "_update",
diff --git a/applications/luci-app-ddns/luasrc/tools/ddns.lua b/applications/luci-app-ddns/luasrc/tools/ddns.lua
index 4466063cb..ecc413136 100644
--- a/applications/luci-app-ddns/luasrc/tools/ddns.lua
+++ b/applications/luci-app-ddns/luasrc/tools/ddns.lua
@@ -96,58 +96,6 @@ function get_pid(section)
 	return pid
 end
 
--- compare versions using "<=" "<" ">" ">=" "=" "<<" ">>"
-function ipkg_ver_compare(ver1, comp, ver2)
-	if not ver1 or not ver2
-	or not comp or not (#comp > 0) then return nil end
-	-- correct compare string
-	if comp == "<>" or comp == "><" or comp == "!=" or comp == "~=" then comp = "~="
-	elseif comp == "<=" or comp == "<" or comp == "=<" then comp = "<="
-	elseif comp == ">=" or comp == ">" or comp == "=>" then comp = ">="
-	elseif comp == "="  or comp == "==" then comp = "=="
-	elseif comp == "<<" then comp = "<"
-	elseif comp == ">>" then comp = ">"
-	else return nil end
-
-	local av1 = UTIL.split(ver1, "[%.%-]", nil, true)
-	local av2 = UTIL.split(ver2, "[%.%-]", nil, true)
-
-	for i = 1, math.max(table.getn(av1),table.getn(av2)), 1  do
-		local s1 = av1[i] or ""
-		local s2 = av2[i] or ""
-
-		-- first "not equal" found return true
-		if comp == "~=" and (s1 ~= s2) then return true end
-		-- first "lower" found return true
-		if (comp == "<" or comp == "<=") and (s1 < s2) then return true end
-		-- first "greater" found return true
-		if (comp == ">" or comp == ">=") and (s1 > s2) then return true end
-		-- not equal then return false
-		if (s1 ~= s2) then return false end
-	end
-
-	-- all equal and not compare greater or lower then true
-	return not (comp == "<" or comp == ">")
-end
-
--- read version information for given package if installed
-function ipkg_ver_installed(pkg)
-	local version = nil
-	local control = io.open("/usr/lib/opkg/info/%s.control" % pkg, "r")
-	if control then
-		local ln
-		repeat
-			ln = control:read("*l")
-			if ln and ln:match("^Version: ") then
-				version = ln:gsub("^Version: ", "")
-				break
-			end
-		until not ln
-		control:close()
-	end
-	return version
-end
-
 -- replacement of build-in read of UCI option
 -- modified AbstractValue.cfgvalue(self, section) from cbi.lua
 -- needed to read from other option then current value definition
@@ -172,24 +120,77 @@ function read_value(self, section, option)
 	end
 end
 
--- replacement of build-in Flag.parse of cbi.lua
--- modified to mark section as changed if value changes
--- current parse did not do this, but it is done AbstaractValue.parse()
-function flag_parse(self, section)
-	local fexists = self.map:formvalue(
-		luci.cbi.FEXIST_PREFIX .. self.config .. "." .. section .. "." .. self.option)
+-- replacement of build-in parse of "Value"
+-- modified AbstractValue.parse(self, section, novld) from cbi.lua
+-- validate is called if rmempty/optional true or false
+-- before write check if forcewrite, value eq default, and more
+function value_parse(self, section, novld)
+	local fvalue = self:formvalue(section)
+	local fexist = ( fvalue and (#fvalue > 0) )	-- not "nil" and "not empty"
+	local cvalue = self:cfgvalue(section)
+	local rm_opt = ( self.rmempty or self.optional )
+	local eq_cfg					-- flag: equal cfgvalue
 
-	if fexists then
-		local fvalue = self:formvalue(section) and self.enabled or self.disabled
-		local cvalue = self:cfgvalue(section)
-		if fvalue ~= self.default or (not self.optional and not self.rmempty) then
-			self:write(section, fvalue)
-		else
-			self:remove(section)
+	-- If favlue and cvalue are both tables and have the same content
+	-- make them identical
+	if type(fvalue) == "table" and type(cvalue) == "table" then
+		eq_cfg = (#fvalue == #cvalue)
+		if eq_cfg then
+			for i=1, #fvalue do
+				if cvalue[i] ~= fvalue[i] then
+					eq_cfg = false
+				end
+			end
 		end
-		if (fvalue ~= cvalue) then self.section.changed = true end
-	else
-		self:remove(section)
+		if eq_cfg then
+			fvalue = cvalue
+		end
+	end
+
+	-- removed parameter "section" from function call because used/accepted nowhere
+	-- also removed call to function "transfer"
+	local vvalue, errtxt = self:validate(fvalue)
+
+	-- error handling; validate return "nil"
+	if not vvalue then
+		if novld then 		-- and "novld" set
+			return		-- then exit without raising an error
+		end
+
+		if fexist then		-- and there is a formvalue
+			self:add_error(section, "invalid", errtxt)
+			return		-- so data are invalid
+
+		elseif not rm_opt then	-- and empty formvalue but NOT (rmempty or optional) set
+			self:add_error(section, "missing", errtxt)
+			return		-- so data is missing
+		end
+	end
+	-- for whatever reason errtxt set and not handled above
+	assert( not (errtxt and (#errtxt > 0)), "unhandled validate error" )
+
+	-- lets continue with value returned from validate
+	eq_cfg  = ( vvalue == cvalue )			-- update equal_config flag
+	local vexist = ( vvalue and (#vvalue > 0) )	-- not "nil" and "not empty"
+	local eq_def = ( vvalue == self.default )	-- equal_default flag
+
+	-- not forcewrite and (rmempty or optional)
+	-- and (no data or equal_default)
+	if not self.forcewrite and rm_opt
+	  and (not vexist or eq_def) then
+		if self:remove(section) then		-- remove data from UCI
+			self.section.changed = true	-- and push events
+		end
+		return
+	end
+
+	-- not forcewrite and no changes, so nothing to write
+	if not self.forcewrite and eq_cfg then
+		return
+	end
+
+	-- write data to UCI; raise event only on changes
+	if self:write(section, vvalue) and not eq_cfg then
 		self.section.changed = true
 	end
 end
diff --git a/applications/luci-app-ddns/luasrc/view/ddns/detail_logview.htm b/applications/luci-app-ddns/luasrc/view/ddns/detail_logview.htm
index 4dcb7bb6f..fd1d5be26 100644
--- a/applications/luci-app-ddns/luasrc/view/ddns/detail_logview.htm
+++ b/applications/luci-app-ddns/luasrc/view/ddns/detail_logview.htm
@@ -6,7 +6,7 @@
 		var txt = document.getElementById("cbid.ddns." + section + "._logview.txt");	// TextArea
 		if ( !txt ) { return; }	// security check
 
-		XHR.get('<%=url('admin/services/ddns/logview')%>/' + section, null,
+		XHR.get('<%=url([[admin]], [[services]], [[ddns]], [[logview]])%>/' + section, null,
 			function(x) {
 				if (x.responseText == "_nodata_")
 					txt.value = "<%:File not found or empty%>";
diff --git a/applications/luci-app-ddns/luasrc/view/ddns/overview_status.htm b/applications/luci-app-ddns/luasrc/view/ddns/overview_status.htm
index b6d4ebb9f..b409ed072 100644
--- a/applications/luci-app-ddns/luasrc/view/ddns/overview_status.htm
+++ b/applications/luci-app-ddns/luasrc/view/ddns/overview_status.htm
@@ -19,7 +19,7 @@
 			var section = data[i].section	// Section to handle
 			var cbx = document.getElementById("cbid.ddns." + section + ".enabled");		// Enabled
 			var btn = document.getElementById("cbid.ddns." + section + "._startstop");	// Start/Stop button
-			var rip = document.getElementById("cbid.ddns." + section + "._domainIP.two");	// Registered IP
+			var rip = document.getElementById("cbid.ddns." + section + "._lookupIP.two");	// Registered IP
 			var lup = document.getElementById("cbid.ddns." + section + "._update.one");	// Last Update
 			var nup = document.getElementById("cbid.ddns." + section + "._update.two");	// Next Update
 			if ( !(cbx && btn && rip && lup && nup) ) { return; }	// security check
@@ -76,12 +76,12 @@
 					break;
 			}
 
-			// domain
-			// (data[i].domain ignored here
+			// lookup
+			// (data[i].lookup ignored here
 
 			// registered IP
 			// rip.innerHTML = "Registered IP";
-			if (data[i].domain == "_nodomain_")
+			if (data[i].lookup == "_nolookup_")
 				rip.innerHTML = '';
 			else if (data[i].reg_ip == "_nodata_")
 				rip.innerHTML = '<em><%:No data%></em>';
@@ -136,7 +136,7 @@
 
 		// do start/stop
 		var btnXHR = new XHR();
-		btnXHR.post('<%=url('admin/services/ddns/startstop')%>/' + section + '/' + cbx.checked, { token: '<%=token%>' },
+		btnXHR.post('<%=url([[admin]], [[services]], [[ddns]], [[startstop]])%>/' + section + '/' + cbx.checked, { token: '<%=token%>' },
 			function(x, data) {
 				if (x.responseText == "_uncommitted_") {
 					// we need a trick to display Ampersand "&" in stead of "&#38;" or "&amp;"
@@ -155,7 +155,7 @@
 	}
 
 	// force to immediate show status on page load (not waiting for XHR.poll)
-	XHR.get('<%=url('admin/services/ddns/status')%>', null,
+	XHR.get('<%=url([[admin]], [[services]], [[ddns]], [[status]])%>', null,
 		function(x, data) {
 			if (data) { _data2elements(data); }
 		}
@@ -164,7 +164,7 @@
 	// define only ONE XHR.poll in a page because if one is running it blocks the other one
 	// optimum is to define on Map or Section Level from here you can reach all elements
 	// we need update every 15 seconds only
-	XHR.poll(15, '<%=url('admin/services/ddns/status')%>', null,
+	XHR.poll(5, '<%=url([[admin]], [[services]], [[ddns]], [[status]])%>', null,
 		function(x, data) {
 			if (data) { _data2elements(data); }
 		}
diff --git a/applications/luci-app-ddns/luasrc/view/ddns/system_status.htm b/applications/luci-app-ddns/luasrc/view/ddns/system_status.htm
index 06dca48a9..5bdcb03e7 100644
--- a/applications/luci-app-ddns/luasrc/view/ddns/system_status.htm
+++ b/applications/luci-app-ddns/luasrc/view/ddns/system_status.htm
@@ -69,15 +69,15 @@
 					break;
 			}
 
-			// domain
-			if (data[j].domain == "_nodomain_")
+			// lookup
+			if (data[j].lookup == "_nolookup_")
 				tr.insertCell(-1).innerHTML = '<em><%:config error%></em>';
 			else
-				tr.insertCell(-1).innerHTML = data[j].domain;
+				tr.insertCell(-1).innerHTML = data[j].lookup;
 
 			// registered IP
 			switch (data[j].reg_ip) {
-				case "_nodomain_":
+				case "_nolookup_":
 					tr.insertCell(-1).innerHTML = '<em><%:Config error%></em>';
 					break;
 				case "_nodata_":
@@ -111,13 +111,13 @@
 	}
 
 	// force to immediate show status (not waiting for XHR.poll)
-	XHR.get('<%=url('admin/services/ddns/status')%>', null,
+	XHR.get('<%=url([[admin]], [[services]], [[ddns]], [[status]])%>', null,
 		function(x, data) {
 			if (data) { _data2elements(x, data); }
 		}
 	);
 
-	XHR.poll(5, '<%=url('admin/services/ddns/status')%>', null,
+	XHR.poll(15, '<%=url([[admin]], [[services]], [[ddns]], [[status]])%>', null,
 		function(x, data) {
 			if (data) { _data2elements(x, data); }
 		}
@@ -132,7 +132,7 @@
 		<tr class="cbi-section-table-titles">
 			<th class="cbi-section-table-cell"><%:Configuration%></th>
 			<th class="cbi-section-table-cell"><%:Next Update%></th>
-			<th class="cbi-section-table-cell"><%:Hostname/Domain%></th>
+			<th class="cbi-section-table-cell"><%:Lookup Hostname%></th>
 			<th class="cbi-section-table-cell"><%:Registered IP%></th>
 			<th class="cbi-section-table-cell"><%:Network%></th>
 		</tr>
diff --git a/applications/luci-app-ddns/po/de/ddns.po b/applications/luci-app-ddns/po/de/ddns.po
index 6ffde5d54..e662adc78 100644
--- a/applications/luci-app-ddns/po/de/ddns.po
+++ b/applications/luci-app-ddns/po/de/ddns.po
@@ -1,15 +1,15 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: luci-app-ddns\n"
-"POT-Creation-Date: 2015-05-08 21:29+0100\n"
-"PO-Revision-Date: 2015-05-08 21:47+0100\n"
+"POT-Creation-Date: 2015-11-04 19:10-0100\n"
+"PO-Revision-Date: 2015-11-14 18:31+0100\n"
 "Last-Translator: Christian Schoenebeck <christian.schoenebeck@gmail.com>\n"
 "Language-Team: \n"
 "Language: de\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"X-Generator: Poedit 1.7.5\n"
+"X-Generator: Poedit 1.8.6\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
 "X-Poedit-SourceCharset: UTF-8\n"
 "X-Poedit-Basepath: .\n"
@@ -70,6 +70,9 @@ msgstr ""
 msgid "Casual users should not change this setting"
 msgstr "Standard Benutzer sollten diese Einstellung nicht ändern."
 
+msgid "Change provider"
+msgstr "Anbieter wechseln"
+
 msgid "Check Interval"
 msgstr "Prüfinterval"
 
@@ -125,6 +128,12 @@ msgstr "Eigenes Update-Skript"
 msgid "DDNS Autostart disabled"
 msgstr "DDNS Autostart deaktiviert"
 
+msgid "DDNS Client Configuration"
+msgstr "DDNS Client Konfiguration"
+
+msgid "DDNS Client Documentation"
+msgstr "DDNS Client Dokumentation"
+
 msgid "DDNS Service provider"
 msgstr "DDNS-Dienstanbieter"
 
@@ -196,6 +205,9 @@ msgstr ""
 msgid "Disabled"
 msgstr "Deaktiviert"
 
+msgid "Domain"
+msgstr "Domäne"
+
 msgid "Dynamic DNS"
 msgstr "Dynamisches DNS"
 
@@ -284,8 +296,10 @@ msgstr "HTTPS nicht unterstützt"
 msgid "Hints"
 msgstr "Hinweise"
 
-msgid "Hostname/Domain"
-msgstr "Rechnername/Domäne"
+msgid "Hostname/FQDN to validate, if IP update happen or necessary"
+msgstr ""
+"Hostname/FQDN um zu überprüfen, ob eine Aktualisierung stattgefunden hat "
+"oder notwendig ist"
 
 msgid "IP address source"
 msgstr "IP-Adressquelle"
@@ -385,6 +399,12 @@ msgstr "Protokoll in Datei schreiben"
 msgid "Log to syslog"
 msgstr "Systemprotokoll verwenden"
 
+msgid "Lookup Hostname"
+msgstr "Nachschlage-Hostname"
+
+msgid "NOT installed"
+msgstr "NICHT installiert"
+
 msgid ""
 "Neither GNU Wget with SSL nor cURL installed to select a network to use for "
 "communication."
@@ -454,6 +474,21 @@ msgstr ""
 msgid "On Error the script will stop execution after given number of retrys"
 msgstr "Das Skript wird nach der gegebenen Anzahl von Fehlversuchen beendet."
 
+msgid "OpenWrt Wiki"
+msgstr "OpenWrt Wiki"
+
+msgid "Optional Encoded Parameter"
+msgstr "Optionaler codierten Parameter"
+
+msgid "Optional Parameter"
+msgstr "Optionaler Parameter"
+
+msgid "Optional: Replaces [PARAMENC] in Update-URL (URL-encoded)"
+msgstr "Optional: Ersetzt [PARAMENC] in der Update-URL (URL-codiert)"
+
+msgid "Optional: Replaces [PARAMOPT] in Update-URL (NOT URL-encoded)"
+msgstr "Optional: Ersetzt [PARAMENC] in der Update-URL (NICHT URL-codiert)"
+
 msgid "Overview"
 msgstr "Übersicht"
 
@@ -484,17 +519,20 @@ msgstr "Prozess ID"
 msgid "Read / Reread log file"
 msgstr "Protokolldatei (neu) einlesen"
 
+msgid "Really change DDNS provider?"
+msgstr "Wirklich DDNS-Anbieter wechseln?"
+
 msgid "Registered IP"
 msgstr "Registrierte IP"
 
 msgid "Replaces [DOMAIN] in Update-URL"
 msgstr "Ersetzt [DOMAIN] in der Update-URL"
 
-msgid "Replaces [PASSWORD] in Update-URL"
-msgstr "Ersetzt [PASSWORD] in der Update-URL"
+msgid "Replaces [PASSWORD] in Update-URL (URL-encoded)"
+msgstr "Ersetzt [PASSWORD] in der Update-URL (URL-codiert)"
 
-msgid "Replaces [USERNAME] in Update-URL"
-msgstr "Ersetzt [USERNAME] in der Update-URL"
+msgid "Replaces [USERNAME] in Update-URL (URL-encoded)"
+msgstr "Ersetzt [USERNAME] in der Update-URL (URL-codiert)"
 
 msgid "Run once"
 msgstr "Einmalig ausführen"
@@ -528,7 +566,7 @@ msgstr ""
 "Optionen."
 
 msgid "The default setting of '0' will retry infinite."
-msgstr "Der Standard-Wert von '0' wird es endlosen erneut versuchen."
+msgstr "Beim Standard-Wert von '0' wird es endlos erneut versucht."
 
 msgid "There is no service configured."
 msgstr "Kein Dienst konfiguriert"
@@ -661,8 +699,8 @@ msgstr "Stunden"
 msgid "installed"
 msgstr "installiert"
 
-msgid "invalid - Sample"
-msgstr "ungültig - Beispiel"
+msgid "invalid FQDN / required - Sample"
+msgstr "ungültige FQDN / Pflichtfeld - Beispiel"
 
 msgid "minimum value '0'"
 msgstr "Minimum Wert '0'"
diff --git a/applications/luci-app-ddns/po/templates/ddns.pot b/applications/luci-app-ddns/po/templates/ddns.pot
index 35386802b..7ab51dd93 100644
--- a/applications/luci-app-ddns/po/templates/ddns.pot
+++ b/applications/luci-app-ddns/po/templates/ddns.pot
@@ -50,6 +50,9 @@ msgstr ""
 msgid "Casual users should not change this setting"
 msgstr ""
 
+msgid "Change provider"
+msgstr ""
+
 msgid "Check Interval"
 msgstr ""
 
@@ -96,6 +99,12 @@ msgstr ""
 msgid "DDNS Autostart disabled"
 msgstr ""
 
+msgid "DDNS Client Configuration"
+msgstr ""
+
+msgid "DDNS Client Documentation"
+msgstr ""
+
 msgid "DDNS Service provider"
 msgstr ""
 
@@ -149,6 +158,9 @@ msgstr ""
 msgid "Disabled"
 msgstr ""
 
+msgid "Domain"
+msgstr ""
+
 msgid "Dynamic DNS"
 msgstr ""
 
@@ -230,7 +242,7 @@ msgstr ""
 msgid "Hints"
 msgstr ""
 
-msgid "Hostname/Domain"
+msgid "Hostname/FQDN to validate, if IP update happen or necessary"
 msgstr ""
 
 msgid "IP address source"
@@ -315,6 +327,12 @@ msgstr ""
 msgid "Log to syslog"
 msgstr ""
 
+msgid "Lookup Hostname"
+msgstr ""
+
+msgid "NOT installed"
+msgstr ""
+
 msgid ""
 "Neither GNU Wget with SSL nor cURL installed to select a network to use for "
 "communication."
@@ -373,6 +391,21 @@ msgstr ""
 msgid "On Error the script will stop execution after given number of retrys"
 msgstr ""
 
+msgid "OpenWrt Wiki"
+msgstr ""
+
+msgid "Optional Encoded Parameter"
+msgstr ""
+
+msgid "Optional Parameter"
+msgstr ""
+
+msgid "Optional: Replaces [PARAMENC] in Update-URL (URL-encoded)"
+msgstr ""
+
+msgid "Optional: Replaces [PARAMOPT] in Update-URL (NOT URL-encoded)"
+msgstr ""
+
 msgid "Overview"
 msgstr ""
 
@@ -403,16 +436,19 @@ msgstr ""
 msgid "Read / Reread log file"
 msgstr ""
 
+msgid "Really change DDNS provider?"
+msgstr ""
+
 msgid "Registered IP"
 msgstr ""
 
 msgid "Replaces [DOMAIN] in Update-URL"
 msgstr ""
 
-msgid "Replaces [PASSWORD] in Update-URL"
+msgid "Replaces [PASSWORD] in Update-URL (URL-encoded)"
 msgstr ""
 
-msgid "Replaces [USERNAME] in Update-URL"
+msgid "Replaces [USERNAME] in Update-URL (URL-encoded)"
 msgstr ""
 
 msgid "Run once"
@@ -563,7 +599,7 @@ msgstr ""
 msgid "installed"
 msgstr ""
 
-msgid "invalid - Sample"
+msgid "invalid FQDN / required - Sample"
 msgstr ""
 
 msgid "minimum value '0'"