ddns-scripts: Update to Version 2.1.0-1 see description

- fixed postinst and prerm in Makefile
- implementation of provider specific update scripts into services and
services_ipv6 file.
	first Provider "no-ip.com"	- Thanks to DarkStarXxX for
request and testing
- finished uci/ddns wiki at http://wiki.openwrt.org/doc/uci/ddns
- rewritten retry management
- rewritten logging including following Issue 469
	https://github.com/openwrt/packages/issues/469
- stop running sections on hotplug ifdown event (like start on ifup)
- implement trap detection
	also kill "sleep" child processes
	SIGHUP to reload configuration (not really reloading, simply
starting a new process)
	/etc/init.d/ddns reload implemented
- code optimization
- new provider LoopiaDNS.se	Issue 494
	https://github.com/openwrt/packages/issues/494

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

net/ddns-scripts/CHANGELOG

+Version 2.1.0-1
+Date	2014-11-09
+
+- fixed postinst and prerm in Makefile
+- implementation of provider specific update scripts into services and services_ipv6 file.
+	first Provider "no-ip.com"	- Thanks to DarkStarXxX for request and testing
+- finished uci/ddns wiki at http://wiki.openwrt.org/doc/uci/ddns
+- rewritten retry management
+- rewritten logging including following Issue 469 
+	https://github.com/openwrt/packages/issues/469
+- stop running sections on hotplug ifdown event (like start on ifup)
+- implement trap detection
+	also kill "sleep" child processes
+	SIGHUP to reload configuration (not really reloading, simply starting a new process)
+	/etc/init.d/ddns reload implemented
+- code optimization
+- new provider LoopiaDNS.se	Issue 494
+	https://github.com/openwrt/packages/issues/494
+
+--------------------------------------------------------------------------------
+Version 2.0.1-9
+Date	2014-10-11
+
+- add retry loop to verify dns and proxy when script starts
+
+--------------------------------------------------------------------------------
+Version 2.0.1-8
+Date	2014-10-06
+
+- fixes problem CRITICAL ERROR - custom update_script not found
+
+--------------------------------------------------------------------------------
+Version 2.0.1-7
+Date	2014-10-05
+
+- Added support for custom update scripts with new option update_script
+
+--------------------------------------------------------------------------------
+Version 2.0.1-6
+Date	2014-10-01
+
+- url encode USERNAME and PASSWORD in update url
+
+--------------------------------------------------------------------------------
+Version 2.0.1-5
+Date	2014-09-30
+
+- fix send_update() detection of private IPv4
+
+--------------------------------------------------------------------------------
+Version 2.0.1-4
+Date	2014-09-29
+
+- fix ticket #17998: wrongly detect ipv4 start with 10x.x.x.x
+
+--------------------------------------------------------------------------------
+Version 2.0.1-3
+Date	2014-09-28
+
+- add service two-dns.de
+
+--------------------------------------------------------------------------------
+Version 2.0.1-2
+Date	2014-09-22
+
+- fix issue (#337) current/registered ip
+	https://github.com/openwrt/packages/issues/337
+
+--------------------------------------------------------------------------------
+Version 2.0.1-1
+Date	2014-09-20
+
+- 1st published version via github
+
+--------------------------------------------------------------------------------
+Version 2.0.0
+Date	2014-07-16
+
+- published via OpenWrt TRAC system as zip-file for testing
+	- IPv6 address support
+	- log file support
+	- syslog support for various error levels
+	- verify all given parameters before starting main loop
+	- retry max retry_counter times before terminating scripts

net/ddns-scripts/Makefile

 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ddns-scripts
-PKG_VERSION:=2.0.1
-PKG_RELEASE:=9
+PKG_VERSION:=2.1.0
+PKG_RELEASE:=1
 PKG_LICENSE:=GPL-2.0
 
 PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
 define Package/ddns-scripts/postinst
 	#!/bin/sh
 	# if run within buildroot exit
-	[ -n "${IPKG_INSTROOT}" ] && exit 0
+	[ -n "$${IPKG_INSTROOT}" ] && exit 0
+
+	# remove old sed script file
+	[ -f /usr/lib/ddns/url_escape.sed ] && rm -f /usr/lib/ddns/url_escape.sed
 
 	# add new section "ddns" "global" if not exists
 	uci -q get ddns.global > /dev/null || uci -q set ddns.global='ddns'
 define Package/ddns-scripts/prerm
 	#!/bin/sh
 	# if run within buildroot exit
-	[ -n "${IPKG_INSTROOT}" ] && exit 0
+	[ -n "$${IPKG_INSTROOT}" ] && exit 0
 
 	# stop running scripts
 	/etc/init.d/ddns disable

net/ddns-scripts/files/etc/config/ddns

 #
 # Please read ddns.sample
+# or http://wiki.openwrt.org/doc/uci/ddns
 #
 config ddns "global"
 	option date_format "%F %R"
 
 
 config service "myddns_ipv4"
-	option service_name	"dyndns.org"
-	option domain		"yourhost.dyndns.org"
+	option service_name	"example.org"
+	option domain		"yourhost.example.org"
 	option username		"your_username"
 	option password		"your_password"
 	option interface	"wan"

net/ddns-scripts/files/etc/config/ddns.sample

 	###########
 	# use HTTPS for secure communication with you DDNS provider
 	# personally found some providers having problems when not sending 
-	# updates via HTTPS. Yyou must not specify "https://" in update_url. 
+	# updates via HTTPS. You must not specify "https://" in update_url. 
 	# It's modified by the scripts themselves
 	# Needs GNU Wget (with SSL support) or cURL to be installed.
 	# default: "0"	do not use HTTPS
 	# the transfer program can find them. (might need package CA-certificates)
 	# if you don't want to verify servers certificate (insecure) you should
 	# this parameter to "IGNORE" (in capital letters)
-	# default: "/etc/cacert"	path where CA-certificate package is installed
-	option cacert "/etc/cacert"
+	# default: (none)	path where CA-certificate package is installed
+	option cacert "/etc/ssl/certs"
 
 	###########
 	# for logging and control if everything work fine you can get information inside
 	option force_ipversion "0"
 
 	###########
-	# normally the current (in the internet) registered ip is detected using the
+	# Normally the current (in the internet) registered ip is detected using the
 	# local defined name lookup policies (i.e. /etc/resolve.conf etc.)
 	# Specify here a DNS server to use instead of the defaults.
 	# you can use hostname or ip address
-	# IPv6 address must be in squared brackets "[...]"
 	# i.e. "google-public-dns-a.google.com"
 	# default: none
 #	option dns_server "google-public-dns-a.google.com"
 	# ip_source='web' (see above) because this request is also 
 	# send via the configured proxy !!!
 	# Syntax: [user:password@]proxy:port !port is required !
+	# IPv6 address must be in squared brackets "[...]"
 	# default: none
 #	option proxy ''
 
 	# wait this time before verify if update was successful send.
 	# !!! checks below 5 minutes make no sense because the Internet 
 	# needs about 5-10 minutes to sync an IP-change to all DNS servers !!!
-	# accepted unit entry’s: 'seconds' 'minutes' 'hours' 'days'
+	# accepted unit entry’s: 'seconds' 'minutes' 'hours'
 	# minimum 5 minutes == 300 seconds
 	# default 10 minutes
 	option check_interval	'10'
 	###########
 	# force to send an update to service provider, if no change was detected.
 	# consult DDNS providers documentation if your DDNS entry might timeout.
-	# accepted unit entry’s: 'seconds' 'minutes' 'hours' 'days'
+	# accepted unit entry’s: 'minutes' 'hours' 'days'
 	# minimum needs to be greater or equal check interval (see above)
 	# A special setting of '0' is allowed, which forces the script to run once.
 	# It sends an update, verify if update was accepted by DNS 
 	# if error happen on detecting, sending or updating the
 	# script will retry the relevant action.
 	# here you define the time to wait before retry is started
-	# accepted unit entry’s: 'seconds' 'minutes' 'hours' 'days'
+	# accepted unit entry’s: 'seconds' 'minutes'
 	# default: 60 seconds
 	option retry_interval	'60'
 	option retry_unit	'seconds'

net/ddns-scripts/files/etc/hotplug.d/iface/25-ddns

 #!/bin/sh
 
-if [ "$ACTION" = "ifup" ]; then
-	. /usr/lib/ddns/dynamic_dns_functions.sh
-	/etc/init.d/ddns enabled && start_daemon_for_all_ddns_sections "$INTERFACE"
-fi
-
-
+# there are other ACTIONs like ifupdate we don't need
+# so parse dynamic_dns_functions.sh only when needed
+case "$ACTION" in
+	ifup)
+		. /usr/lib/ddns/dynamic_dns_functions.sh
+		/etc/init.d/ddns enabled && start_daemon_for_all_ddns_sections "$INTERFACE"
+		;;
+	ifdown)
+		. /usr/lib/ddns/dynamic_dns_functions.sh
+		stop_daemon_for_all_ddns_sections "$INTERFACE"
+		;;
+esac

net/ddns-scripts/files/etc/init.d/ddns

 #!/bin/sh /etc/rc.common
 START=95
+STOP=10
 
 boot() {
 	return 0
 }
 
+reload() {
+	killall -1 dynamic_dns_updater.sh	# send SIGHUP
+}
+
+restart() {
+	stop
+	sleep 1	# give time to shutdown
+	start
+}
+
 start() {
 	. /usr/lib/ddns/dynamic_dns_functions.sh
 	start_daemon_for_all_ddns_sections
 }
 
 stop() {
-	killall -9 dynamic_dns_updater.sh
+	killall dynamic_dns_updater.sh
 }
-

net/ddns-scripts/files/usr/lib/ddns/dynamic_dns_updater.sh

 # by Christian Schoenebeck <christian dot schoenebeck at gmail dot com>
 # to support:
 # - IPv6 DDNS services
-# - DNS Server to retrieve registered IP including TCP transport
+# - DNS Server to retrieve registered IP including TCP transport (Ticket 7820)
 # - Proxy Server to send out updates
-# - force_interval=0 to run once
+# - force_interval=0 to run once (Luci Ticket 538)
 # - the usage of BIND's host command instead of BusyBox's nslookup if installed
 # - extended Verbose Mode and log file support for better error detection 
+# - wait for interface to fully come up, before the first update is done
 #
 # variables in small chars are read from /etc/config/ddns
 # variables in big chars are defined inside these scripts as global vars
 . /usr/lib/ddns/dynamic_dns_functions.sh	# global vars are also defined here
 
 SECTION_ID="$1"
-VERBOSE_MODE=${2:-1}	#default mode is log to console
+VERBOSE_MODE=${2:-1}	# default mode is log to console
 
 # set file names
 PIDFILE="$RUNDIR/$SECTION_ID.pid"	# Process ID file
 
 # VERBOSE_MODE > 1 delete logfile if exist to create an empty one
 # only with this data of this run for easier diagnostic
-# new one created by verbose_echo function
+# new one created by write_log function
 [ $VERBOSE_MODE -gt 1 -a -f $LOGFILE ] && rm -f $LOGFILE
 
+# TRAP handler
+trap "trap_handler 0 \$?" 0	# handle script exit with exit status
+trap "trap_handler 1"  1	# SIGHUP	Hangup / reload config
+trap "trap_handler 2"  2	# SIGINT	Terminal interrupt
+trap "trap_handler 3"  3	# SIGQUIT	Terminal quit
+#trap "trap_handler 9"  9	# SIGKILL	no chance to trap
+trap "trap_handler 15" 15	# SIGTERM	Termination
+
 ################################################################################
 # Leave this comment here, to clearly document variable names that are expected/possible
 # Use load_all_config_options to load config options, which is a much more flexible solution.
 #
 # config_load "ddns"
-# config_get <variable> $SECTION_ID <option]>
+# config_get <variable> $SECTION_ID <option>
 #
 # defined options (also used as variable):
 # 
 [ "$(uci_get ddns $SECTION_ID)" != "service" ] && {
 	[ $VERBOSE_MODE -le 1 ] && VERBOSE_MODE=2	# force console out and logfile output
 	[ -f $LOGFILE ] && rm -f $LOGFILE		# clear logfile before first entry
-	verbose_echo "\n ************** =: ************** ************** **************"
-	verbose_echo "       STARTED =: PID '$$' at $(eval $DATE_PROG)"
-	verbose_echo "    UCI CONFIG =:\n$(uci -q show ddns | grep '=service' | sort)"
-	critical_error "Service '$SECTION_ID' not defined"
+	write_log  7 "************ ************** ************** **************"
+	write_log  5 "PID '$$' started at $(eval $DATE_PROG)"
+	write_log  7 "uci configuration:\n$(uci -q show ddns | grep '=service' | sort)"
+	write_log 14 "Service section '$SECTION_ID' not defined"
 }
 load_all_config_options "ddns" "$SECTION_ID"
 
-verbose_echo "\n ************** =: ************** ************** **************"
-verbose_echo "       STARTED =: PID '$$' at $(eval $DATE_PROG)"
+write_log  7 "************ ************** ************** **************"
+write_log  5 "PID '$$' started at $(eval $DATE_PROG)"
 case $VERBOSE_MODE in
-	0) verbose_echo "  verbose mode =: '0' - run normal, NO console output";;
-	1) verbose_echo "  verbose mode =: '1' - run normal, console mode";;
-	2) verbose_echo "  verbose mode =: '2' - run once, NO retry on error";;
-	3) verbose_echo "  verbose mode =: '3' - run once, NO retry on error, NOT sending update";;
-	*) critical_error "ERROR detecting VERBOSE_MODE '$VERBOSE_MODE'"
+	0) write_log  7 "verbose mode '0' - run normal, NO console output";;
+	1) write_log  7 "verbose mode '1' - run normal, console mode";;
+	2) write_log  7 "verbose mode '2' - run once, NO retry on error";;
+	3) write_log  7 "verbose mode '3' - run once, NO retry on error, NOT sending update";;
+	*) write_log 14 "error detecting VERBOSE_MODE '$VERBOSE_MODE'";;
 esac
-verbose_echo "    UCI CONFIG =:\n$(uci -q show ddns.$SECTION_ID | sort)"
+write_log 7 "uci configuraion:\n$(uci -q show ddns.$SECTION_ID | sort)"
 
 # set defaults if not defined
 [ -z "$enabled" ]	  && enabled=0
 [ "$ip_source" = "web" -a -z "$ip_url" -a $use_ipv6 -eq 1 ] && ip_url="http://checkipv6.dyndns.com"
 [ "$ip_source" = "interface" -a -z "$ip_interface" ] && ip_interface="eth1"
 
-# check configuration and enabled state
-[ -z "$domain" -o -z "$username" -o -z "$password" ] && critical_error "Service Configuration not correctly configured"
-[ $enabled -eq 0 ] && critical_error "Service Configuration is disabled"
+# check enabled state otherwise we don't need to continue
+[ $enabled -eq 0 ] && write_log 14 "Service section disabled!"
+
+# without domain or username or password we can do nothing for you
+[ -z "$domain" -o -z "$username" -o -z "$password" ] && write_log 14 "Service section not correctly configured!"
+urlencode URL_USER "$username"	# encode username, might be email or something like this
+urlencode URL_PASS "$password"	# encode password, might have special chars for security reason
 
-# verify script if configured and executable
+# verify ip_source script if configured and executable
 if [ "$ip_source" = "script" ]; then
-	[ -z "$ip_script" ] && critical_error "No script defined to detect local IP"
-	[ -x "$ip_script" ] || critical_error "Script to detect local IP not found or not executable"
+	[ -z "$ip_script" ] && write_log 14 "No script defined to detect local IP!"
+	[ -x "$ip_script" ] || write_log 14 "Script to detect local IP not found or not executable!"
 fi
 
 # compute update interval in seconds
 get_seconds CHECK_SECONDS ${check_interval:-10} ${check_unit:-"minutes"} # default 10 min
 get_seconds FORCE_SECONDS ${force_interval:-72} ${force_unit:-"hours"}	 # default 3 days
 get_seconds RETRY_SECONDS ${retry_interval:-60} ${retry_unit:-"seconds"} # default 60 sec
-verbose_echo "check interval =: $CHECK_SECONDS seconds"
-verbose_echo "force interval =: $FORCE_SECONDS seconds"
-verbose_echo "retry interval =: $RETRY_SECONDS seconds"
-verbose_echo " retry counter =: $retry_count times"
+[ $CHECK_SECONDS -lt 300 ] && CHECK_SECONDS=300		# minimum 5 minutes
+[ $FORCE_SECONDS -gt 0 -a $FORCE_SECONDS -lt $CHECK_SECONDS ] && FORCE_SECONDS=$CHECK_SECONDS	# FORCE_SECONDS >= CHECK_SECONDS or 0
+write_log 7 "check interval: $CHECK_SECONDS seconds"
+write_log 7 "force interval: $FORCE_SECONDS seconds"
+write_log 7 "retry interval: $RETRY_SECONDS seconds"
+write_log 7 "retry counter : $retry_count times"
 
 # determine what update url we're using if a service_name is supplied
-# otherwise update_url is set inside configuration (custom service)
+# otherwise update_url is set inside configuration (custom update url)
 # or update_script is set inside configuration (custom update script)
 [ -n "$service_name" ] && get_service_data update_url update_script
-[ -z "$update_url" -a -z "$update_script" ] && critical_error "no update_url found/defined or no update_script found/defined"
-[ -n "$update_script" -a ! -f "$update_script" ] && critical_error "custom update_script not found"
+[ -z "$update_url" -a -z "$update_script" ] && write_log 14 "No update_url found/defined or no update_script found/defined!"
+[ -n "$update_script" -a ! -f "$update_script" ] && write_log 14 "Custom update_script not found!"
 
 #kill old process if it exists & set new pid file
 if [ -d $RUNDIR ]; then
-	#if process is already running, stop it
-	if [ -e "$PIDFILE" ]; then
-		OLD_PID=$(cat $PIDFILE)
-		ps | grep -q "^[\t ]*$OLD_PID" && {
-			verbose_echo "   old process =: PID '$OLD_PID'"
-			kill $OLD_PID
-		} || verbose_echo "old process id =: PID 'none'"
-	else
-		verbose_echo "old process id =: PID 'none'"
-	fi
+	#if process for section is already running, stop it
+	stop_section_processes "$SECTION_ID"
+	[ $? -gt 0 ] && write_log 7 "Send 'SIGTERM' to old process" || write_log 7 "No old process"
 else
 	#make dir since it doesn't exist
 	mkdir -p $RUNDIR
-	verbose_echo "old process id =: PID 'none'"
+	write_log 7 "No old process"
 fi
 echo $$ > $PIDFILE
 
 	[ $LAST_TIME -gt $CURR_TIME ] && LAST_TIME=0
 }
 if [ $LAST_TIME -eq 0 ]; then
-	verbose_echo "   last update =: never"
+	write_log 7 "last update: never"
 else
 	EPOCH_TIME=$(( $(date +%s) - CURR_TIME + LAST_TIME ))
 	EPOCH_TIME="date -d @$EPOCH_TIME +'$DATE_FORMAT'"
-	verbose_echo "   last update =: $(eval $EPOCH_TIME)"
+	write_log 7 "last update: $(eval $EPOCH_TIME)"
 fi
 
 # we need time here because hotplug.d is fired by netifd
 # but IP addresses are not set by DHCP/DHCPv6 etc.
-verbose_echo "       waiting =: 10 seconds for interfaces to fully come up"
-sleep 10
-
-# verify DNS server: 
-# do with retry's because there might be configurations
-# not directly could connect to outside dns when interface is already up
-ERR_VERIFY=0	# reset err counter
-while [ -n "$dns_server" ]; do
-	[ $ERR_VERIFY -eq 0 ] && verbose_echo "******* VERIFY =: DNS server '$dns_server'"
-	verify_dns "$dns_server"
-	ERR_LAST=$?			# save return value
-	[ $ERR_LAST -eq 0 ] && break	# everything ok leave while loop
-	ERR_VERIFY=$(( $ERR_VERIFY + 1 ))
-	# if error count > retry_count leave here with critical error
-	[ $ERR_VERIFY -gt $retry_count ] && {
-		case $ERR_LAST in
-			2)	critical_error "Invalid DNS server Error: '2' - nslookup can not resolve host";;
-			3)	critical_error "Invalid DNS server Error: '3' - nc (netcat) can not connect";;
-			*)	critical_error "Invalid DNS server Error: '$ERR_LAST' - unspecific error";;
-		esac
-	}
-	case $ERR_LAST in
-		2)	syslog_err "Invalid DNS server Error: '2' - nslookup can not resolve host - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
-		3)	syslog_err "Invalid DNS server Error: '3' - nc (netcat) can not connect - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
-		*)	syslog_err "Invalid DNS server Error: '$ERR_LAST' - unspecific error - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
-	esac
-	[ $VERBOSE_MODE -gt 1 ] && {
-		# VERBOSE_MODE > 1 then NO retry
-		verbose_echo "\n!!!!!!!!! ERROR =: Verbose Mode - NO retry\n"
-		break
-	}
-	verbose_echo "******** RETRY =: DNS server '$dns_server' - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds"
-	sleep $RETRY_SECONDS
-done
+write_log 7 "Waiting 10 seconds for interfaces to fully come up"
+sleep 10 &
+PID_SLEEP=$!
+wait $PID_SLEEP	# enable trap-handler
+PID_SLEEP=0
+
+# verify DNS server 
+[ -n "$dns_server" ] && verify_dns "$dns_server"
 
 # verify Proxy server and set environment
-# do with retry's because there might be configurations
-# not directly could connect to outside dns when interface is already up
-ERR_VERIFY=0	# reset err counter
 [ -n "$proxy" ] && {
-	[ $ERR_VERIFY -eq 0 ] && verbose_echo "******* VERIFY =: Proxy server 'http://$proxy'"
-	verify_proxy "$proxy"
-	ERR_LAST=$?			# save return value
-	[ $ERR_LAST -eq 0 ] && {
-		# everything ok set proxy and leave while loop
+	verify_proxy "$proxy" && {
+		# everything ok set proxy
 		export HTTP_PROXY="http://$proxy"
 		export HTTPS_PROXY="http://$proxy"
 		export http_proxy="http://$proxy"
 		export https_proxy="http://$proxy"
-		break
 	}
-	ERR_VERIFY=$(( $ERR_VERIFY + 1 ))
-	# if error count > retry_count leave here with critical error
-	[ $ERR_VERIFY -gt $retry_count ] && {
-		case $ERR_LAST in
-			2)	critical_error "Invalid Proxy server Error '2' - nslookup can not resolve host";;
-			3)	critical_error "Invalid Proxy server Error '3' - nc (netcat) can not connect";;
-			*)	critical_error "Invalid Proxy server Error '$ERR_LAST' - unspecific error";;
-		esac
-	}
-	case $ERR_LAST in
-		2)	syslog_err "Invalid Proxy server Error '2' - nslookup can not resolve host - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
-		3)	syslog_err "Invalid Proxy server Error '3' - nc (netcat) can not connect - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
-		*)	syslog_err "Invalid Proxy server Error '$ERR_LAST' - unspecific error - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
-	esac
-	[ $VERBOSE_MODE -gt 1 ] && {
-		# VERBOSE_MODE > 1 then NO retry
-		verbose_echo "\n!!!!!!!!! ERROR =: Verbose Mode - NO retry\n"
-		break
-	}
-	verbose_echo "******** RETRY =: Proxy server 'http://$proxy' - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds"
-	sleep $RETRY_SECONDS
 }
 
 # let's check if there is already an IP registered at the web
 # but ignore errors if not
-verbose_echo "******* DETECT =: Registered IP"
-get_registered_ip REGISTERED_IP
+get_registered_ip REGISTERED_IP "NO_RETRY"
 
 # loop endlessly, checking ip every check_interval and forcing an updating once every force_interval
-# NEW: ### Luci Ticket 538
-# a "force_interval" of "0" will run this script only once
-# the update is only done once when an interface goes up
-# or you run /etc/init.d/ddns start or you can use a cron job
-# it will force an update without check when lastupdate happen
-# but it will verify after "check_interval" if update is seen in the web 
-# and retries on error retry_count times
-# CHANGES: ### Ticket 16363
-# modified nslookup / sed / grep to detect registered ip
-# NEW: ### Ticket 7820
-# modified nslookup to support non standard dns_server (needs to be defined in /etc/config/ddns)
-# support for BIND host command.
-# Wait for interface to fully come up, before the first update is done
-verbose_echo "*** START LOOP =: $(eval $DATE_PROG)"
-# we run NOT once
-[ $FORCE_SECONDS -gt 0 -o $VERBOSE_MODE -le 1 ] && syslog_info "Starting main loop"
-
+write_log 6 "Starting main loop at $(eval $DATE_PROG)"
 while : ; do
 
-	# read local IP
-	verbose_echo "******* DETECT =: Local IP"
-	get_local_ip LOCAL_IP
-	ERR_LAST=$?	# save return value
-	# Error in function
-	[ $ERR_LAST -gt 0 ] && {
-		if [ $VERBOSE_MODE -le 1 ]; then	# VERBOSE_MODE <= 1 then retry
-			# we can't read local IP
-			ERR_LOCAL_IP=$(( $ERR_LOCAL_IP + 1 ))
-			[ $ERR_LOCAL_IP -gt $retry_count ] && critical_error "Can not detect local IP"
-			verbose_echo "\n!!!!!!!!! ERROR =: detecting local IP - retry $ERR_LOCAL_IP/$retry_count in $RETRY_SECONDS seconds\n"
-			syslog_err "Error detecting local IP - retry $ERR_LOCAL_IP/$retry_count in $RETRY_SECONDS seconds"
-			sleep $RETRY_SECONDS
-			continue	# jump back to the beginning of while loop
-		else
-			verbose_echo "\n!!!!!!!!! ERROR =: detecting local IP - NO retry\n"
-		fi
-	}
-	ERR_LOCAL_IP=0	# reset err counter
+	get_local_ip LOCAL_IP		# read local IP
 
 	# prepare update
-	# never updated or forced immediate then NEXT_TIME = 0 
+	# never updated or forced immediate then NEXT_TIME = 0
 	[ $FORCE_SECONDS -eq 0 -o $LAST_TIME -eq 0 ] \
 		&& NEXT_TIME=0 \
 		|| NEXT_TIME=$(( $LAST_TIME + $FORCE_SECONDS ))
-	# get current uptime
-	get_uptime CURR_TIME
-	
-	# send update when current time > next time or local ip different from registered ip (as loop on error)
-	ERR_SEND=0
-	while [ $CURR_TIME -ge $NEXT_TIME -o "$LOCAL_IP" != "$REGISTERED_IP" ]; do
+
+	get_uptime CURR_TIME		# get current uptime
+
+	# send update when current time > next time or local ip different from registered ip
+	if [ $CURR_TIME -ge $NEXT_TIME -o "$LOCAL_IP" != "$REGISTERED_IP" ]; then
 		if [ $VERBOSE_MODE -gt 2 ]; then
-			verbose_echo "  VERBOSE MODE =: NO UPDATE send to DDNS provider"
+			write_log 7 "Verbose Mode: $VERBOSE_MODE - NO UPDATE send"
 		elif [ "$LOCAL_IP" != "$REGISTERED_IP" ]; then
-			verbose_echo "******* UPDATE =: LOCAL: '$LOCAL_IP' <> REGISTERED: '$REGISTERED_IP'"
+			write_log 7 "Update needed - L: '$LOCAL_IP' <> R: '$REGISTERED_IP'"
 		else
-			verbose_echo "******* FORCED =: LOCAL: '$LOCAL_IP' == REGISTERED: '$REGISTERED_IP'"
+			write_log 7 "Forced Update - L: '$LOCAL_IP' == R: '$REGISTERED_IP'"
 		fi
-		# only send if VERBOSE_MODE < 3
+
 		ERR_LAST=0
 		[ $VERBOSE_MODE -lt 3 ] && {
-			send_update "$LOCAL_IP" 
+			# only send if VERBOSE_MODE < 3
+			send_update "$LOCAL_IP"
 			ERR_LAST=$?	# save return value
 		}
 
-		# Error in function 
-		if [ $ERR_LAST -gt 0 ]; then
-			if [ $VERBOSE_MODE -le 1 ]; then	# VERBOSE_MODE <=1 then retry
-				# error sending local IP
-				ERR_SEND=$(( $ERR_SEND + 1 ))
-				[ $ERR_SEND -gt $retry_count ] && critical_error "can not send update to DDNS Provider"
-				verbose_echo "\n!!!!!!!!! ERROR =: sending update - retry $ERR_SEND/$retry_count in $RETRY_SECONDS seconds\n"
-				syslog_err "Error sending update - retry $ERR_SEND/$retry_count in $RETRY_SECONDS seconds"
-				sleep $RETRY_SECONDS
-				continue # re-loop
-			else
-				verbose_echo "\n!!!!!!!!! ERROR =: sending update to DDNS service - NO retry\n"
-				break
-			fi
-		else
-			# we send data so save "last time"
-			get_uptime LAST_TIME
+		# error sending local IP to provider 
+		# we have no communication error (handled inside send_update/do_transfer)
+		# but update was not recognized
+		# do NOT retry after RETRY_SECONDS, do retry after CHECK_SECONDS
+		# to early retrys will block most DDNS provider
+		# providers answer is checked inside send_update() function
+		[ $ERR_LAST -eq 0 ] && {
+			get_uptime LAST_TIME		# we send update, so
 			echo $LAST_TIME > $UPDFILE	# save LASTTIME to file
 			[ "$LOCAL_IP" != "$REGISTERED_IP" ] \
-				&& syslog_notice "Changed IP: '$LOCAL_IP' successfully send" \
-				|| syslog_notice "Forced Update: IP: '$LOCAL_IP' successfully send"
-			break # leave while
-		fi
-	done
+				&& write_log 6 "Update successful - IP '$LOCAL_IP' send" \
+				|| write_log 6 "Forced update successful - IP: '$LOCAL_IP' send"
+		} || write_log 3 "Can not update IP at DDNS Provider"
+	fi
 
 	# now we wait for check interval before testing if update was recognized
-	# only sleep if VERBOSE_MODE <= 2 because nothing send so do not wait
+	# only sleep if VERBOSE_MODE <= 2 because otherwise nothing was send
 	[ $VERBOSE_MODE -le 2 ] && {
-		verbose_echo "****** WAITING =: $CHECK_SECONDS seconds (Check Interval) before continue"
-		sleep $CHECK_SECONDS
-	} || verbose_echo "  VERBOSE MODE =: NO WAITING for Check Interval\n"
-
-	# read at DDNS service registered IP (in loop on error)
-	REGISTERED_IP=""
-	ERR_REG_IP=0
-	while : ; do
-		verbose_echo "******* DETECT =: Registered IP"
-		get_registered_ip REGISTERED_IP
-		ERR_LAST=$?	# save return value
-
-		# No Error in function we leave while loop
-		[ $ERR_LAST -eq 0  ] && break
-
-		# we can't read Registered IP
-		if [ $VERBOSE_MODE -le 1 ]; then	# VERBOSE_MODE <=1 then retry
-			ERR_REG_IP=$(( $ERR_REG_IP + 1 ))
-			[ $ERR_REG_IP -gt $retry_count ] && critical_error "can not detect registered local IP"
-			verbose_echo "\n!!!!!!!!! ERROR =: detecting Registered IP - retry $ERR_REG_IP/$retry_count in $RETRY_SECONDS seconds\n"
-			syslog_err "Error detecting Registered IP - retry $ERR_REG_IP/$retry_count in $RETRY_SECONDS seconds"
-			sleep $RETRY_SECONDS
-		else
-			verbose_echo "\n!!!!!!!!! ERROR =: detecting Registered IP - NO retry\n"
-			break	# leave while loop
-		fi
-	done
+		write_log 7 "Waiting $CHECK_SECONDS seconds (Check Interval)"
+		sleep $CHECK_SECONDS &
+		PID_SLEEP=$!
+		wait $PID_SLEEP	# enable trap-handler
+		PID_SLEEP=0
+	} || write_log 7 "Verbose Mode: $VERBOSE_MODE - NO Check Interval waiting"
+
+	REGISTERED_IP=""		# clear variable
+	get_registered_ip REGISTERED_IP	# get registered/public IP
 
 	# IP's are still different
 	if [ "$LOCAL_IP" != "$REGISTERED_IP" ]; then
 		if [ $VERBOSE_MODE -le 1 ]; then	# VERBOSE_MODE <=1 then retry
 			ERR_UPDATE=$(( $ERR_UPDATE + 1 ))
-			[ $ERR_UPDATE -gt $retry_count ] && critical_error "Registered IP <> Local IP - LocalIP: '$LOCAL_IP' - RegisteredIP: '$REGISTERED_IP'"
-			verbose_echo "\n!!!!!!!!! ERROR =: Registered IP <> Local IP - starting retry $ERR_UPDATE/$retry_count\n"
-			syslog_warn "Warning: Registered IP <> Local IP - starting retry $ERR_UPDATE/$retry_count"
+			[ $ERR_UPDATE -gt $retry_count ] && write_log 14 "Updating IP at DDNS provider failed after $retry_count retries"
+			write_log 4 "Updating IP at DDNS provider failed - starting retry $ERR_UPDATE/$retry_count"
 			continue # loop to beginning
 		else
-			verbose_echo "\n!!!!!!!!! ERROR =: Registered IP <> Local IP - LocalIP: '$LOCAL_IP' - RegisteredIP: '$REGISTERED_IP' - NO retry\n"
+			write_log 4 "Updating IP at DDNS provider failed"
+			write_log 7 "Verbose Mode: $VERBOSE_MODE - NO retry"; exit 1
 		fi
-	fi		
-
-	# we checked successful the last update
-	ERR_UPDATE=0			# reset error counter
+	else
+		# we checked successful the last update
+		ERR_UPDATE=0			# reset error counter
+	fi
 
-	# force_update=0 or VERBOSE_MODE > 1 - leave the main loop
-	[ $FORCE_SECONDS -eq 0 -o $VERBOSE_MODE -gt 1 ] && {
-		verbose_echo "****** LEAVING =: $(eval $DATE_PROG)"
-		syslog_info "Leaving"
-		break
-	}
-	verbose_echo "********* LOOP =: $(eval $DATE_PROG)"
-	syslog_info "Rerun IP check"
+	# force_update=0 or VERBOSE_MODE > 1 - leave here
+	[ $VERBOSE_MODE -gt 1 ]  && write_log 7 "Verbose Mode: $VERBOSE_MODE - NO reloop"; exit 0
+	[ $FORCE_SECONDS -eq 0 ] && write_log 6 "Configured to run once"; exit 0
+	write_log 6 "Rerun IP check at $(eval $DATE_PROG)"
 done
-
-verbose_echo "****** STOPPED =: PID '$$' at $(eval $DATE_PROG)\n"
-syslog_info "Done"
-
-exit 0
+# we should never come here there must be a programming error
+write_log 12 "Error in 'dynamic_dns_updater.sh - program coding error"

net/ddns-scripts/files/usr/lib/ddns/services

-# This file contains the update urls for various dynamic dns services.
-# Column one contains the service name, column two contains the update url.
-# within the update url there are 4 variables you can use: [USERNAME], 
-# [PASSWORD], [DOMAIN] and [IP].  These are substituted for the username, 
-# password, and domain name specified in the /etc/config/ddns file when an 
-# update is performed.  The IP is substituted for the current ip address of the
-# router.  These variables are case sensitive, while urls generally are not, so 
-# if you need to enter the same text in the url (which seems very unlikely) put 
-# that text in lowercase, while the variables should remain in uppercase
+#444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444
+#4
+#4 This file contains the update urls for various dynamic dns services.
+#4 Column one contains the service name, column two contains the update url.
+#4 within the update url there are 4 variables you can use: [USERNAME], 
+#4 [PASSWORD], [DOMAIN] and [IP].  These are substituted for the username, 
+#4 password, and domain name specified in the /etc/config/ddns file when an 
+#4 update is performed.  The IP is substituted for the current ip address of the
+#4 router.  These variables are case sensitive, while urls generally are not, so 
+#4 if you need to enter the same text in the url (which seems very unlikely) put 
+#4 that text in lowercase, while the variables should remain in uppercase
+#4
+#4 There are TONS of dynamic dns services out there. There's a huge list of them at:
+#4 http://www.dmoz.org/Computers/Software/Internet/Servers/Address_Management/Dynamic_DNS_Services/
+#4 If anyone has time they could update this file to be compatible with a bunch of them
+#4
+#4 !!! Since ddns-scripts Version 2.x the update of IPv6 addresses is also supported
+#4 !!! This file is used for update of IPv4 adresses only. For IPv6 use services_ipv6
+#4 
+#4 !!! Since ddns-scripts Version 2.x the update via provider specific update scripts is supported. 
+#4 !!! This scripts must be located at /usr/lib/ddns directory if defined inside this file.
+#4 !!! Use only the script name (without path). Sample: 
+#4 !!! "example.com"	"update_sample.sh"
+#4
+#444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444
 
 "dyndns.org"		"http://[USERNAME]:[PASSWORD]@members.dyndns.org/nic/update?hostname=[DOMAIN]&myip=[IP]"
 "changeip.com"		"http://[USERNAME]:[PASSWORD]@nic.changeip.com/nic/update?u=[USERNAME]&p=[PASSWORD]&cmd=update&hostname=[DOMAIN]&ip=[IP]"
 "zoneedit.com"		"http://[USERNAME]:[PASSWORD]@dynamic.zoneedit.com/auth/dynamic.html?host=[DOMAIN]&dnsto=[IP]"
 "free.editdns.net"	"http://dyndns-free.editdns.net/api/dynLinux.php?p=[PASSWORD]&r=[DOMAIN]"
 
-#noip is an alias of no-ip, so allow both names for the same service
-"no-ip.com"		"http://[USERNAME]:[PASSWORD]@dynupdate.no-ip.com/nic/update?hostname=[DOMAIN]&myip=[IP]"
-"noip.com"		"http://[USERNAME]:[PASSWORD]@dynupdate.no-ip.com/nic/update?hostname=[DOMAIN]&myip=[IP]"
+# noip is an alias of no-ip, so allow both names for the same service
+# use provider specific update script
+"no-ip.com"	"update_no-ip.sh"
+"noip.com"	"update_no-ip.sh"
 
 #freedns.afraid.org is weird, you just need an update code, for which we use the password variable
 "freedns.afraid.org"	"http://freedns.afraid.org/dynamic/update.php?[PASSWORD]&address=[IP]"
 
-#### ADD YOURS HERE! ######################################################################################
-#                                                                                                         #
-# There are TONS of dynamic dns services out there. There's a huge list of them at:                       #
-# http://www.dmoz.org/Computers/Software/Internet/Servers/Address_Management/Dynamic_DNS_Services/        #
-# If anyone has time they could update this file to be compatible with a bunch of them                    #
-#                                                                                                         #
-###########################################################################################################
-
 # DNS Max and resellers' update urls
 "dnsmax.com"	"http://update.dnsmax.com/update/?username=[USERNAME]&password=[PASSWORD]&resellerid=1&clientname=openwrt&clientversion=8.09&protocolversion=2.0&updatehostname=[DOMAIN]&ip=[IP]"
 "thatip.com"	"http://update.dnsmax.com/update/?username=[USERNAME]&password=[PASSWORD]&resellerid=2&clientname=openwrt&clientversion=8.09&protocolversion=2.0&updatehostname=[DOMAIN]&ip=[IP]"
 
 # Hurricane Electric Dynamic DNS
-"he.net"		"http://[DOMAIN]:[PASSWORD]@dyn.dns.he.net/nic/update?hostname=[DOMAIN]&myip=[IP]" 
+"he.net"	"http://[DOMAIN]:[PASSWORD]@dyn.dns.he.net/nic/update?hostname=[DOMAIN]&myip=[IP]" 
 
 # DNSdynamic.org
 "dnsdynamic.org"	"http://[USERNAME]:[PASSWORD]@www.dnsdynamic.org/api/?hostname=[DOMAIN]&myip=[IP]"
 
 # dnsExit.com free dynamic DNS update url
-"dnsexit.com"		"http://www.dnsexit.com/RemoteUpdate.sv?login=[USERNAME]&password=[PASSWORD]&host=[DOMAIN]&myip=[IP]"
+"dnsexit.com"	"http://www.dnsexit.com/RemoteUpdate.sv?login=[USERNAME]&password=[PASSWORD]&host=[DOMAIN]&myip=[IP]"
 
 # OVH
 "ovh.com" "http://[USERNAME]:[PASSWORD]@www.ovh.com/nic/update?system=dyndns&hostname=[DOMAIN]&myip=[IP]"
 "namecheap.com" "http://dynamicdns.park-your-domain.com/update?host=[USERNAME]&domain=[DOMAIN]&password=[PASSWORD]&ip=[IP]"
 
 # easydns.com dynamic DNS
-"easydns.com"		"http://[USERNAME]:[PASSWORD]@api.cp.easydns.com/dyn/tomato.php?hostname=[DOMAIN]&myip=[IP]"
+"easydns.com"	"http://[USERNAME]:[PASSWORD]@api.cp.easydns.com/dyn/tomato.php?hostname=[DOMAIN]&myip=[IP]"
 
 # Winco DDNS
 "ddns.com.br"	"http://[DOMAIN]:[PASSWORD]@members.ddns.com.br/nic/update?hostname=[DOMAIN]&myip=[IP]"
 
 # MyDNS.JP
 "mydns.jp"	"http://www.mydns.jp/directip.html?MID=[USERNAME]&PWD=[PASSWORD]&IPV4ADDR=[IP]"
+
+# LoopiaDNS
+"loopia.se" "http://[USERNAME]:[PASSWORD]@dns.loopia.se/XDynDNSServer/XDynDNS.php?system=custom&hostname=[DOMAIN]&myip=[IP]"

net/ddns-scripts/files/usr/lib/ddns/services_ipv6

-# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-# !!!!! IPv6 Version of original services file			!!!!!
-# !!!!! funtionally and syntax is the same			!!!!!
-# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-# This file contains the update urls for various dynamic dns services.
-# Column one contains the service name, column two contains the update url.
-# within the update url there are 4 variables you can use: [USERNAME], 
-# [PASSWORD], [DOMAIN] and [IP].  These are substituted for the username, 
-# password, and domain name specified in the /etc/config/ddns file when an 
-# update is performed.  The IP is substituted for the current ip address of the
-# router.  These variables are case sensitive, while urls generally are not, so 
-# if you need to enter the same text in the url (which seems very unlikely) put 
-# that text in lowercase, while the variables should remain in uppercase
+#666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666
+#6
+#6 This file contains the update urls for various dynamic dns services.
+#6 Column one contains the service name, column two contains the update url.
+#6 within the update url there are 4 variables you can use: [USERNAME], 
+#6 [PASSWORD], [DOMAIN] and [IP].  These are substituted for the username, 
+#6 password, and domain name specified in the /etc/config/ddns file when an 
+#6 update is performed.  The IP is substituted for the current ip address of the
+#6 router.  These variables are case sensitive, while urls generally are not, so 
+#6 if you need to enter the same text in the url (which seems very unlikely) put 
+#6 that text in lowercase, while the variables should remain in uppercase
+#6
+#6 There are TONS of dynamic dns services out there. There's a huge list of them at:
+#6 http://www.dmoz.org/Computers/Software/Internet/Servers/Address_Management/Dynamic_DNS_Services/
+#6 If anyone has time they could update this file to be compatible with a bunch of them
+#6
+#6 !!! Since ddns-scripts Version 2.x the update of IPv6 addresses is also supported
+#6 !!! This file is used for update of IPv6 adresses only. For IPv4 use services
+#6 
+#6 !!! Since ddns-scripts Version 2.x the update via provider specific update scripts is supported. 
+#6 !!! This scripts must be located at /usr/lib/ddns directory if defined inside this file.
+#6 !!! Use only the script name (without path). Sample:
+#6 !!! "example.com"	"update_sample.sh"
+#6
+#666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666
 
-# tested with
-
-# Securepoint Dynamic-DNS-Service
+#IPv6 @ Securepoint Dynamic-DNS-Service
 "spdns.de"	"http://[USERNAME]:[PASSWORD]@update.spdns.de/nic/update?hostname=[DOMAIN]&myip=[IP]"
 
-# Hurricane Electric Dynamic DNS
+#IPv6 @ Hurricane Electric Dynamic DNS
 "he.net"	"http://[DOMAIN]:[PASSWORD]@dyn.dns.he.net/nic/update?hostname=[DOMAIN]&myip=[IP]" 
 
-#### ADD YOURS HERE! ######################################################################################
-#                                                                                                         #
-# There are TONS of dynamic dns services out there. There's a huge list of them at:                       #
-# http://www.dmoz.org/Computers/Software/Internet/Servers/Address_Management/Dynamic_DNS_Services/        #
-# If anyone has time they could update this file to be compatible with a bunch of them                    #
-#                                                                                                         #
-###########################################################################################################
-
-# MyDNS.JP
+#IPv6 @ MyDNS.JP
 "mydns.jp"	"http://www.mydns.jp/directip.html?MID=[USERNAME]&PWD=[PASSWORD]&IPV6ADDR=[IP]"

net/ddns-scripts/files/usr/lib/ddns/update_no-ip.sh

+#
+# script for sending updates to no-ip.com / noip.com
+# 2014 Christian Schoenebeck <christian dot schoenebeck at gmail dot com>
+#
+# This script is parsed by dynamic_dns_functions.sh inside send_update() function
+#
+# provider did not reactivate records, if no IP change was recognized
+# so we send a dummy (localhost) and a seconds later we send the correct IP addr
+#
+local __ANSWER __LH
+local __UPDURL="http://[USERNAME]:[PASSWORD]@dynupdate.no-ip.com/nic/update?hostname=[DOMAIN]&myip=[IP]"
+
+# set IP version dependend dummy (localhost)
+[ $use_ipv6 -eq 0 ] && __LH="127.0.0.1" || __LH="::1"
+
+# lets do DUMMY transfer
+write_log 7 "sending dummy IP to 'no-ip.com'"
+__URL=$(echo $__UPDURL | sed -e "s#\[USERNAME\]#$URL_USER#g" -e "s#\[PASSWORD\]#$URL_PASS#g" \
+			       -e "s#\[DOMAIN\]#$domain#g" -e "s#\[IP\]#$__LH#g")
+[ $use_https -ne 0 ] && __URL=$(echo $__URL | sed -e 's#^http:#https:#')
+
+do_transfer __ANSWER "$__URL" || return 1
+
+write_log 7 "'no-ip.com' answered:\n$__ANSWER"
+# analyse provider answers
+# "good [IP_ADR]"	= successful
+# "nochg [IP_ADR]"	= no change but OK
+echo "$__ANSWER" | grep -E "good|nochg" >/dev/null 2>&1 || return 1
+
+# lets wait a seconds
+sleep 1
+
+# now send the correct data
+write_log 7 "sending real IP to 'no-ip.com'"
+__URL=$(echo $__UPDURL | sed -e "s#\[USERNAME\]#$URL_USER#g" -e "s#\[PASSWORD\]#$URL_PASS#g" \
+			       -e "s#\[DOMAIN\]#$domain#g" -e "s#\[IP\]#$__IP#g")
+[ $use_https -ne 0 ] && __URL=$(echo $__URL | sed -e 's#^http:#https:#')
+
+do_transfer __ANSWER "$__URL" || return 1
+
+write_log 7 "'no-ip.com' answered:\n$__ANSWER"
+# analyse provider answers
+# "good [IP_ADR]"	= successful
+# "nochg [IP_ADR]"	= no change but OK
+echo "$__ANSWER" | grep -E "good|nochg" >/dev/null 2>&1
+return $?	# "0" if "good" or "nochg" found
+

net/ddns-scripts/files/usr/lib/ddns/update_sample.sh

 #
 # the code here is the copy of the default used inside send_update()
 #
-local __USER __PASS __ANSWER
+local __ANSWER
 # tested with spdns.de
 local __URL="http://[USERNAME]:[PASSWORD]@update.spdns.de/nic/update?hostname=[DOMAIN]&myip=[IP]"
 
 # do replaces in URL
-__urlencode __USER "$username"	# encode username, might be email or something like this
-__urlencode __PASS "$password"	# encode password, might have special chars for security reason
-__URL=$(echo $__URL | sed -e "s#\[USERNAME\]#$__USER#g" -e "s#\[PASSWORD\]#$__PASS#g" \
+__URL=$(echo $__URL | sed -e "s#\[USERNAME\]#$URL_USER#g" -e "s#\[PASSWORD\]#$URL_PASS#g" \
 			       -e "s#\[DOMAIN\]#$domain#g" -e "s#\[IP\]#$__IP#g")
 [ $use_https -ne 0 ] && __URL=$(echo $__URL | sed -e 's#^http:#https:#')
 
-__do_transfer __ANSWER "$__URL"
-__ERR=$?
-[ $__ERR -gt 0 ] && {
-	verbose_echo "\n!!!!!!!!! ERROR =: Error sending update to DDNS Provider\n"
-	return 1
-}
-verbose_echo "   update send =: DDNS Provider answered\n$__ANSWER"
-return 0
+do_transfer __ANSWER "$__URL" || return 1
+
+write_log 7 "DDNS Provider answered:\n$__ANSWER"
+
+# analyse provider answers
+# "good [IP_ADR]"	= successful
+# "nochg [IP_ADR]"	= no change but OK
+echo "$__ANSWER" | grep -E "good|nochg" >/dev/null 2>&1
+return $?	# "0" if "good" or "nochg" found
+