minor: 📝 update CHANGELOG

no persistent status file was written in case of an error as the return status code was always 0

.gitignore

@@ -1,2 +1,3 @@
 .env*
 docker-compose*
+.vscode

CHANGELOG.md

@@ -1,6 +1,51 @@
 # Changelog
 
 
+## 0.4.0 (2022-11-07)
+
+### Features
+
+* ✨ add support for dynu.com as DynDNS2 provider. [Eduard Veit]
+
+### Documentation
+
+* 📝 add dynu.com as DynDNS2 provider. [Eduard Veit]
+
+
+## 0.3.5 (2022-11-03)
+
+### Features
+
+* ✨ add support for IPv64.net as DynDNS2 provider. [Eduard Veit]
+
+### Fix
+
+* Delete status file after success. [Eduard Veit]
+
+* More status file issues. [Eduard Veit]
+
+* Incorrect status code handling. [Eduard Veit]
+
+  no persistent status file was written in case of an error as the return status code was always 0
+
+### Documentation
+
+* 📝 change TTL to 60 for IPv64.net. [Eduard Veit]
+
+* 📝 add IPv64.net as DynDNS2 provider. [Eduard Veit]
+
+
+## 0.3.4 (2022-06-30)
+
+### Features
+
+* ✨ add support for ddnss.de as DynDNS2 provider. [Eduard Veit]
+
+### Documentation
+
+* 📝 update providers in README. [Eduard Veit]
+
+
 ## 0.3.3 (2022-06-07)
 
 ### Fix

README.md

@@ -7,8 +7,6 @@ IPv4 (A) and IPv6 (AAAA) record updates are supported.
 <!-- TOC -->
 
 - [✨ Update Methods](#-update-methods)
-  - [APIs](#apis)
-  - [DynDNS2](#dyndns2)
 - [📦 Requirements](#-requirements)
 - [🚀 Installation](#-installation)
 - [⚙ Configuration](#-configuration)
@@ -25,18 +23,16 @@ IPv4 (A) and IPv6 (AAAA) record updates are supported.
 
 The following update methods are currently implemented:
 
-### APIs
+| Provider            | API                   | TTL in seconds | Credentials                                                                                  | own domain via NS record | free (sub-) domain                             |
-
+|---------------------|-----------------------|----------------|----------------------------------------------------------------------------------------------|--------------------------|------------------------------------------------|
-- INWX.com Domrobot JSON-RPC-API\
+| INWX.com            | Domrobot JSON-RPC-API | 300            | customer login `username` & `password`. Mobile TAN (OTP) is currently not supported by DynB. | ✔️                       | ⛔ choose one of your owned domains             |
-  Limitations:
+| INWX.com            | DynDNS2               | 60             | specific dyndns `username` & `password`                                                      | ✔️                       | ⛔ choose one of your owned domains per account |
-  - minimum TTL is 300 (5 minutes)
+| deSEC.io (dedyn.io) | DynDNS2               | 60             | `token`                                                                                      | ✔️                       | ✔️                                             |
-
+| DuckDNS.org         | DynDNS2               | 60             | `token`                                                                                      | ⛔                        | ✔️                                             |
-### DynDNS2
+| dynv6.com           | DynDNS2               | 60             | `token`                                                                                      | ✔️                       | ✔️                                             |
-
+| ddnss.de            | DynDNS2               | 10             | `update key` as `token`                                                                      | ⛔                        | ✔️                                             |
-- INWX.com
+| IPv64.net           | DynDNS2               | 60             | `DynDNS Updatehash` as `token`                                                               | ⛔                        | ✔️                                             |
-- deSEC.io (dedyn.io)
+| dynu.com            | DynDNS2               | 30             | `username` & `password`                                                                      | ✔️                       | ✔️                                             |
-- DuckDNS.org
-- dynv6.com
 
 ## 📦 Requirements
 
@@ -57,7 +53,7 @@ or simply clone this repo
 git clone https://github.com/EV21/dynb.git
 ```
 
-If you want to add the script to you PATH, run :point_down:
+If you want to add the script to you PATH, run 👇
 
 ```shell
 bash dynb.sh --link
@@ -92,14 +88,14 @@ DYNB_TOKEN=
 
 ## 🏃 Run
 
-If you have a config file just run :point_down:
+If you have a config file just run 👇
 
 ```bash
 dynb
 ```
 
 Alternatively you can use parameters if your system meets the relevant requirements. This example shows the long form parameter, there are also short ones.\
-Call the help function :point_down:
+Call the help function 👇
 
 ```bash
 dynb --help
@@ -123,13 +119,13 @@ Just use the parameter `--interval 60` or the environment variable `DYNB_INTERVA
 
 ### crontab
 
-execute :point_down:
+execute 👇
 
 ```bash
 crontab -e
 ```
 
-then enter :point_down: to run dynb every five minutes.
+then add the following line 👇 to run dynb every five minutes.
 
 ```bash
 */5 * * * * $HOME/.local/bin/dynb >> $HOME/.local/share/dynb/dynb-cron.log
@@ -159,7 +155,7 @@ services:
     tty: true
     environment:
       - DYNB_DYN_DOMAIN=dyndns.example.com
-      # Providers: deSec, duckDNS, dynv6, inwx
+      # Providers: deSec, DuckDNS, dynv6, inwx, ddnss, ipv64
       - DYNB_SERVICE_PROVIDER=desec
       # Possible update methods are: dyndns, domrobot
       - DYNB_UPDATE_METHOD=dyndns
@@ -179,9 +175,9 @@ services:
 ## environment variables
 
 | variable              | default value   | description                                                                                                    |
-| --------------------- | --------------- | -------------------------------------------------------------------------------------------------------------- |
+|-----------------------|-----------------|----------------------------------------------------------------------------------------------------------------|
 | DYNB_DYN_DOMAIN       | undefined       | required; `dyndns.example.com`                                                                                 |
-| DYNB_SERVICE_PROVIDER | undefined       | required; `deSEC`, `duckdns`, `dynv6`, `inwx`                                                                  |
+| DYNB_SERVICE_PROVIDER | undefined       | required; `deSEC`, `duckdns`, `dynv6`, `inwx`, `ddnss`, `ipv64`                                                |
 | DYNB_UPDATE_METHOD    | undefined       | required; `dyndns` or `domrobot` (with inwx)                                                                   |
 | DYNB_IP_MODE          | undefined       | required; `4`, `6` or `64` for both                                                                            |
 | DYNB_USERNAME         | undefined       | the requirement depends on your provider and the update method                                                 |

dynb.sh

@@ -12,46 +12,50 @@
 
 #DYNB_DYN_DOMAIN=
 
-## service provider could be deSEC, duckdns, dynv6, inwx
+# service provider could be deSEC, duckdns, dynv6, inwx
 #DYNB_SERVICE_PROVIDER=
 
 ## update method options: domrobot, dyndns
 #DYNB_UPDATE_METHOD=
 
-## ip mode could be either: 4, 6 or dual for dualstack
+# ip mode could be either: 4, 6 or dual for dualstack
 #DYNB_IP_MODE=
 
-## If you are using the DomRobot RPC-API enter your credentials for the web interface login here
+# If you are using the DomRobot RPC-API enter your credentials for the web interface login here
-## If you are using the DynDNS2 protocol enter your credentials here
+# If you are using the DynDNS2 protocol enter your credentials here
 #DYNB_USERNAME=
 #DYNB_PASSWORD=
-## or use a token
+# or use a token
 #DYNB_TOKEN=
 
-## TTL (time to live) for the DNS record
+# TTL (time to live) for the DNS record
-## This setting is only relevant for API based record updates (not DnyDNS2!)
+# This setting is only relevant for API based record updates (not DnyDNS2!)
-## minimum allowed TTL value by inwx is 300 (5 minutes)
+# minimum allowed TTL value by inwx is 300 (5 minutes)
 TTL=300
 
-## The IP-Check sites (some sites have different urls for v4 and v6)
+# The IP-Check sites (some sites have different urls for v4 and v6)
-## Pro tip: use your own ip check server for privacy
+# Pro tip: use your own ip check server for privacy
-## it could be as simple as that...
+# it could be as simple as that...
-## create an index.php with <?php echo $_SERVER'REMOTE_ADDR'; ?>
+# create an index.php with <?php echo $_SERVER'REMOTE_ADDR'; ?>
-_ipv4_checker=api64.ipify.org
+#DYNB_IPv4_CHECK_SITE=
-_ipv6_checker=api64.ipify.org
+#DYNB_IPv6_CHECK_SITE=
 
-## An exernal DNS check server prevents wrong info from local DNS servers/resolvers
+# An exernal DNS check server prevents wrong info from local DNS servers/resolvers
-_DNS_checkServer=
+#DYNB_DNS_CHECK_SERVER=9.9.9.9
 
-## if you are actively using multiple network interfaces you might want to specify this
+# if you are actively using multiple network interfaces you might want to specify this
-## normally the default value is okay
+# normally the default value is okay
 #_network_interface=eth0
 _network_interface=
 
 ######################################################
 ## You don't need to change the following variables ##
+
 _INWX_JSON_API_URL=https://api.domrobot.com/jsonrpc/
 _internet_connectivity_test_server=https://www.google.de
+_ipv4_checker=
+_ipv6_checker=
+_DNS_checkServer=
 _new_IPv4=
 _new_IPv6=
 _dns_records=
@@ -66,13 +70,13 @@ _response=
 _statusHostname=
 _statusUsername=
 _statusPassword=
-_version=0.3.3
+_version=0.4.0
 _userAgent="DynB/$_version github.com/EV21/dynb"
 _configFile=$HOME/.local/share/dynb/.env
 _statusFile=/tmp/dynb.status
-_debug=0
+_debug=false
 _minimum_looptime=60
-_loopMode=0
+_loopMode=false
 
 # Ansi color code variables
 yellow_color="\e[0;33m"
@@ -103,9 +107,30 @@ function is_IPv6_address
   fi
 }
 
+## is_ip_address A B
+# parameters required
+# 1. param: ip_version
+# 2. param: ip_address
+function is_ip_address
+{
+  local ip_version=$1
+  local ip_address=$2
+  case $ip_version in
+    4)
+      is_IPv4_address "$ip_address"
+      result=$?
+    ;;
+    6)
+      is_IPv6_address "$ip_address"
+      result=$?
+    ;;
+  esac
+  return $result
+}
+
 function loopMode
 {
-  if [[ $_loopMode -eq 1 ]]
+  if [[ $_loopMode == "true" ]]
   then return 0
   else return 1
   fi
@@ -113,7 +138,7 @@ function loopMode
 
 function debugMode
 {
-  if [[ $_debug -eq 1 ]]
+  if [[ $_debug == "true" ]]
   then return 0
   else return 1
   fi
@@ -186,6 +211,7 @@ function fetchDNSRecords
   _dns_records=$(echo "$_response" | jq '.resData.record[]')
 }
 
+## getRecordID
 # requires parameter A or AAAA
 # result to stdout
 function getRecordID
@@ -194,29 +220,94 @@ function getRecordID
     jq "select(.type == \"${1}\") | .id"
 }
 
+## getDNSIP A
 # requires parameter A or AAAA
 # result to stdout
 function getDNSIP() {
-  echo "$_dns_records" |
+  local record_type=$1
-    jq --raw-output "select(.type == \"${1}\") | .content"
+  if [[ $DYNB_UPDATE_METHOD == domrobot ]]
+  then
+    echo "$_dns_records" |
+      jq --raw-output "select(.type == \"${record_type}\") | .content"
+  else
+    if [[ -n $_DNS_checkServer ]]
+    then dig_response=$(dig @"${_DNS_checkServer}" in "$record_type" +short "$DYNB_DYN_DOMAIN")
+    else dig_response=$(dig in "$record_type" +short "$DYNB_DYN_DOMAIN")
+    fi
+    dig_exitcode=$?
+    if [[ $dig_exitcode -gt 0 ]]
+    then
+      errorMessage "DNS request failed with exit code: $dig_exitcode $dig_response"
+      return 1
+    else
+      case $record_type in
+      A) is_ip_address 4 "$dig_response"
+      ;;
+      AAAA) is_ip_address 6 "$dig_response"
+      ;;
+      esac
+      if test $? -gt 0
+      then return 1
+      fi
+    fi
+    # If the dns resolver lists multiple records in the answer section we filter the first line
+    # using short option "-n" and not "--lines" because of alpines limited BusyBox head command
+    echo "$dig_response" | head -n 1
+  fi
 }
 
+_has_remote_ip_error=false
+
 # requires parameter
 # 1. param: 4 or 6 for ip version
-# 2. param: IP check server address
 # result to stdout
 function getRemoteIP
 {
   local ip_version=$1
-  local ip_check_server=$2
+
-  curl --silent "$_interface_str" --user-agent "$_userAgent" \
+  default_ip_check_servers=("ip64.ev21.de" "api64.ipify.org" "api.my-ip.io/ip" "ip.anysrc.net/plain")
-    --ipv"${ip_version}" --location "${ip_check_server}"
+  case $ip_version in
-  local curls_status_code=$?
+    4)
-  # shellcheck disable=2181
+      if test -n "$_ipv4_checker"
-  if [[ $curls_status_code -gt 0 ]]; then
+      then ip_check_servers=("$_ipv4_checker" "${default_ip_check_servers[@]}")
-    errorMessage "IPCheck (getRemoteIP $ip_version) request failed"
+      else ip_check_servers=("${default_ip_check_servers[@]}")
-    exit 1
+      fi
-  fi
+    ;;
+    6)
+      if test -n "$_ipv6_checker"
+      then ip_check_servers=("$_ipv6_checker" "${default_ip_check_servers[@]}")
+      else ip_check_servers=("${default_ip_check_servers[@]}")
+      fi
+    ;;
+  esac
+
+  for current_check_server in "${ip_check_servers[@]}"
+  do 
+    response=$(curl --silent "$_interface_str" --user-agent "$_userAgent" \
+    --ipv"${ip_version}" --location "${current_check_server}")
+    curls_status_code=$?
+    # shellcheck disable=2181
+    if [[ $curls_status_code -gt 0 ]]
+    then
+      errorMessage "Remote IPv$ip_version request failed with ${current_check_server}"
+      _has_remote_ip_error=true
+      return_value=1
+    else
+      if is_ip_address "$ip_version" "$response"
+      then
+        _has_remote_ip_error=false
+        echo "$response"
+        return_value=0
+        break
+      else
+        errorMessage "The response from the IP check server $current_check_server is not an IPv$ip_version address: $response"
+        _has_remote_ip_error=true
+        return_value=1
+      fi
+    fi
+  done
+
+  return $return_value
 }
 
 # requires parameter
@@ -258,102 +349,150 @@ function updateRecord
   fi
 }
 
-# using DynDNS2 protocol
+function prepare_request_parameters
-function dynupdate
 {
   # default parameter values
-  myip_str=myip
+  ipv4_parameter_name=myip
-  myipv6_str=myipv6
+  ipv6_parameter_name=myipv6
-
+  curl_parameters=("--user-agent" "$_userAgent")
-  INWX_DYNDNS_UPDATE_URL="https://dyndns.inwx.com/nic/update?"
-  DESEC_DYNDNS_UPDATE_URL="https://update.dedyn.io/?"
-  DUCKDNS_DYNDNS_UPDATE_URL="https://www.duckdns.org/update?domains=$DYNB_DYN_DOMAIN&token=$DYNB_TOKEN&"
-  DYNV6_DYNDNS_UPDATE_URL="https://dynv6.com/api/update?zone=$DYNB_DYN_DOMAIN&token=$DYNB_TOKEN&"
 
   case $DYNB_SERVICE_PROVIDER in
-    inwx* | INWX*)
+    [Ii][Nn][Ww][Xx]*)
-      dyndns_update_url=$INWX_DYNDNS_UPDATE_URL
+    # inwx.de
-      ;;
+    # in case of dualstack use you need to request both parameters with the same request
-    deSEC* | desec* | dedyn*)
+    # otherwise inwx will delete the not requested record type
-      dyndns_update_url="${DESEC_DYNDNS_UPDATE_URL}"
+      curl_parameters+=("--user" "$DYNB_USERNAME:$DYNB_PASSWORD")
-      ;;
+      curl_parameters+=("--get") # inwx will ignore the ipv6 parameter if you don't put it into the url
-    dynv6*)
+      dyndns_update_url="https://dyndns.inwx.com/nic/update"
-      dyndns_update_url="${DYNV6_DYNDNS_UPDATE_URL}"
+    ;;
-      myip_str=ipv4
+    [Dd][Yy][Nn][Uu]*)
-      myipv6_str=ipv6
+      curl_parameters+=("--user" "$DYNB_USERNAME:$DYNB_PASSWORD")
-      ;;
+      curl_parameters+=("--get")
-    DuckDNS* | duckdns*)
+      dyndns_update_url="https://api.dynu.com/nic/update"
-      dyndns_update_url="${DUCKDNS_DYNDNS_UPDATE_URL}"
+    ;;
-      myip_str=ip
+    [Dd][Ee][Ss][Ee][Cc]* | [Dd][Ee][Dd][Yy][Nn]* )
-      myipv6_str=ipv6
+    # deSEC.de / dedyn.io
-      ;;
+      curl_parameters+=("--header" "Authorization: Token $DYNB_TOKEN")
+      curl_parameters+=("--get")
+      curl_parameters+=("--data-urlencode" "hostname=$DYNB_DYN_DOMAIN")
+      dyndns_update_url="https://update.dedyn.io"
+    ;;
+    [Dd][Yy][Nn][Vv]6*)
+    # dynv6.com
+      ipv4_parameter_name=ipv4
+      ipv6_parameter_name=ipv6
+      curl_parameters+=("--get")
+      curl_parameters+=("--data-urlencode" "zone=$DYNB_DYN_DOMAIN")
+      curl_parameters+=("--data-urlencode" "token=$DYNB_TOKEN")
+      dyndns_update_url="https://dynv6.com/api/update"
+    ;;
+    [Dd][Uu][Cc][Kk][Dd][Nn][Ss]*)
+    # DuckDNS.org
+      ipv4_parameter_name=ip
+      ipv6_parameter_name=ipv6
+      curl_parameters+=("--get")
+      curl_parameters+=("--data-urlencode" "domains=$DYNB_DYN_DOMAIN")
+      curl_parameters+=("--data-urlencode" "token=$DYNB_TOKEN")
+      dyndns_update_url="https://www.duckdns.org/update"
+    ;;
+    [Dd][Dd][Nn][Ss][Ss]*)
+    # ddnss.de
+      ipv4_parameter_name=ip
+      ipv6_parameter_name=ip6
+      curl_parameters+=("--get")
+      curl_parameters+=("--data-urlencode" "host=$DYNB_DYN_DOMAIN")
+      curl_parameters+=("--data-urlencode" "key=$DYNB_TOKEN")
+      dyndns_update_url="https://ddnss.de/upd.php"
+    ;;
+    [Ii][Pp][Vv]64*)
+    # IPv64.net
+      ipv4_parameter_name=ip
+      ipv6_parameter_name=ip6
+      curl_parameters+=("--request" "POST")
+      curl_parameters+=("--header" "Authorization: Bearer $DYNB_TOKEN")
+      curl_parameters+=("--data-urlencode" "domain=$DYNB_DYN_DOMAIN")
+      dyndns_update_url="https://ipv64.net/nic/update"
+    ;;
     *)
       errorMessage "$DYNB_SERVICE_PROVIDER is not supported"
       exit 1
-      ;;
+    ;;
   esac
 
-  # pre encode ip parameters
+  prepare_ip_flag_parameters
-  if [[ $_is_IPv4_enabled == true ]] && [[ $_is_IPv6_enabled == true ]]; then
+  curl_parameters+=("${ip_flag_parameters[@]}")
-    dyndns_update_url="${dyndns_update_url}${myip_str}=${_new_IPv4}&${myipv6_str}=${_new_IPv6}"
+}
-  fi
-  if [[ $_is_IPv4_enabled == true ]] && [[ $_is_IPv6_enabled == false ]]; then
-    dyndns_update_url="${dyndns_update_url}${myip_str}=${_new_IPv4}"
-  fi
-  if [[ $_is_IPv4_enabled == false ]] && [[ $_is_IPv6_enabled == true ]]; then
-    dyndns_update_url="${dyndns_update_url}${myipv6_str}=${_new_IPv6}"
-  fi
-  debugMessage "Update URL was: $dyndns_update_url"
 
-  ## request ##
+function prepare_ip_flag_parameters
-  case $DYNB_SERVICE_PROVIDER in
+{
-    inwx* | INWX*)
+  if [[ $_is_IPv4_enabled == true ]] && [[ $_is_IPv6_enabled == true ]]
-      _response=$(curl --silent "$_interface_str" \
+  then
-        --user-agent "$_userAgent" \
+    ip_flag_parameters=("--data-urlencode" "${ipv4_parameter_name}=${_new_IPv4}" "--data-urlencode" "${ipv6_parameter_name}=${_new_IPv6}")
-        --user "$DYNB_USERNAME":"$DYNB_PASSWORD" \
+  fi
-        "${dyndns_update_url}")
+  if [[ $_is_IPv4_enabled == true ]] && [[ $_is_IPv6_enabled == false ]]
-      ;;
+  then
-    deSEC* | desec* | dedyn*)
+    ip_flag_parameters=("--data-urlencode" "${ipv4_parameter_name}=${_new_IPv4}")
-      _response=$(curl --silent "$_interface_str" \
+  fi
-        --user-agent "$_userAgent" \
+  if [[ $_is_IPv4_enabled == false ]] && [[ $_is_IPv6_enabled == true ]]
-        --header "Authorization: Token $DYNB_TOKEN" \
+  then
-        --get --data-urlencode "hostname=$DYNB_DYN_DOMAIN" \
+    ip_flag_parameters=("--data-urlencode" "${ipv6_parameter_name}=${_new_IPv6}")
-        "${dyndns_update_url}")
+  fi
-      ;;
+}
-    dynv6* | duckDNS* | duckdns*)
-      _response=$(
-        curl --silent "$_interface_str" \
-          --user-agent "$_userAgent" \
-          "${dyndns_update_url}"
-      )
-      ;;
-  esac
 
-  case $_response in
+function send_request
-    good* | OK* | "addresses updated")
+{
+  local _response
+  debugMessage "curl parameters: ${curl_parameters[*]} ${dyndns_update_url}"
+  _response=$(
+    curl --silent "$_interface_str" \
+    "${curl_parameters[@]}" \
+    "${dyndns_update_url}")
+  analyse_response
+  status_code=$?
+  return $status_code
+}
+
+function analyse_response
+{
+    case $_response in
+    good* | OK* | "addresses updated" | *Updated*hostname* | *'"info":"good"'*)
       if [[ $_response == "good 127.0.0.1" ]]; then
         errorMessage "$_response: Request ignored."
         return 1
       else
-        infoMessage "$_response: The DynDNS update has been executed."
+        infoMessage "The DynDNS update has been executed."
-        _errorCounter=0
+        debugMessage "Response: $_response"
         return 0
       fi
       ;;
-    nochg*)
+    *nochg*)
-      infoMessage "$_response: Nothing has changed, IP addresses are still up to date."
+      infoMessage "Nothing has changed, IP addresses are still up to date."
+      debugMessage "Response: $_response"
+      return 1
+      ;;
+    400* | *'Bad Request'*)
+      errorMessage "Bad Request."
+      debugMessage "Response: $_response"
+      return 1
+      ;;
+    *'Too Many Requests'*)
+      errorMessage "Too Many Request."
+      debugMessage "Response: $_response"
       return 1
       ;;
     abuse)
-      errorMessage "$_response: Username is blocked due to abuse."
+      errorMessage "Username is blocked due to abuse."
+      debugMessage "Response: $_response"
       return 1
       ;;
-    badauth | 401)
+    *badauth* | 401 | *Unauthorized*)
-      errorMessage "$_response: Invalid username password combination."
+      errorMessage "Invalid token or username password combination."
+      debugMessage "Response: $_response"
       return 1
       ;;
     badagent)
-      errorMessage "$_response: Client disabled. Something is very wrong!"
+      errorMessage "Client disabled. Something is very wrong!"
+      debugMessage "Response: $_response"
       return 1
       ;;
     !donator)
@@ -368,8 +507,9 @@ function dynupdate
       errorMessage "$_response: Hostname $DYNB_DYN_DOMAIN is invalid"
       return 1
       ;;
-    nohost)
+    *nohost*)
-      errorMessage "$_response: Hostname supplied does not exist under specified account, enter new login credentials before performing an additional request."
+      errorMessage "Hostname supplied does not exist under specified account, enter new login credentials before performing an additional request."
+      debugMessage "Response: $_response"
       return 1
       ;;
     numhost)
@@ -380,13 +520,13 @@ function dynupdate
       errorMessage "$_response: There is an internal error in the dyndns update system. Retry update no sooner than 30 minutes."
       return 1
       ;;
-    911 | 5*)
+    servererror | 911 | 5*)
       errorMessage "$_response: A fatal error on provider side such as a database outage. Retry update no sooner than 30 minutes."
       return 1
       ;;
     *)
       if [[ "$_response" == "$_status" ]]; then
-        errorMessage "An unknown response code has been received. $_response"
+        errorMessage "An unknown response code has been received: $_response"
         return 1
       else
         errorMessage "unknown respnse code: $_response"
@@ -396,6 +536,15 @@ function dynupdate
   esac
 }
 
+# using DynDNS2 protocol
+function dynupdate
+{
+  prepare_request_parameters
+  send_request
+  request_status=$?
+  return $request_status
+}
+
 function setStatus
 {
   echo "_status=$1; _eventTime=$2; _errorCounter=$3; _statusHostname=$4; _statusUsername=$5; _statusPassword=$6" >/tmp/dynb.status
@@ -405,10 +554,10 @@ function setStatus
 function checkStatus
 {
   case $_status in
-    nochg*)
+    *nochg*)
       if [[ _errorCounter -gt 1 ]]; then
         errorMessage "The update client was spamming unnecessary update requests, something might be wrong with your IP-Check site."
-        errorMessage "Fix your config an then delete $_statusFile or restart your docker container"
+        errorMessage "Fix your config and then delete $_statusFile or restart your docker container"
         return 1
       fi
       ;;
@@ -420,8 +569,8 @@ function checkStatus
       fi
       return 0
       ;;
-    badauth | 401)
+    *badauth* | 401 | *Unauthorized*)
-      if [[ "$_statusUsername" == "$DYNB_USERNAME" && "$_statusPassword" == "$DYNB_PASSWORD" ]]; then
+      if [[ "$_statusUsername" == "$DYNB_USERNAME" &&  ("$_statusPassword" == "$DYNB_PASSWORD" || $_statusPassword == "$DYNB_TOKEN") ]]; then
         errorMessage "Invalid username password combination."
         return 1
       else rm "$_statusFile"
@@ -430,8 +579,7 @@ function checkStatus
       ;;
     badagent)
       errorMessage "Client is deactivated by provider."
-      echo "Fix your config and then manually remove $_statusFile to reset the client blockade."
+      echo "Please file an issue at GitHub or try another client :)"
-      echo "If it still fails file an issue at github or try another client :)"
       return 1
       ;;
     !donator)
@@ -446,7 +594,7 @@ function checkStatus
       echo "If it still fails file an issue at github or try another client :)"
       return 1
       ;;
-    911 | 5*)
+    servererror | 911 | 5* | *'Too Many Requests'*)
       delta=$(($(date +%s) - _eventTime))
       if [[ $delta -lt 1800 ]]
       then
@@ -456,6 +604,14 @@ function checkStatus
       fi
       return 0
       ;;
+    *'Bad Request'*)
+      if [[ "$_statusUsername" == "$DYNB_USERNAME" &&  ("$_statusPassword" == "$DYNB_PASSWORD" || $_statusPassword == "$DYNB_TOKEN") ]]; then
+        errorMessage "Bad Request: Please check your credentials, maybe your token is invalid."
+        return 1
+      else rm "$_statusFile"
+      fi
+      return 0
+      ;;
     *)
       if [[ _errorCounter -gt 1 ]]
       then
@@ -472,58 +628,20 @@ function checkStatus
 function ipHasChanged
 {
   local ip_version=$1
+  remote_ip=$(getRemoteIP "$ip_version")
+  if test $? -gt 0
+  then return 1
+  fi
   case ${ip_version} in
     4)
-      remote_ip=$(getRemoteIP 4 $_ipv4_checker)
+      dns_ip=$(getDNSIP A)
-      if ! is_IPv4_address "$remote_ip"
-      then
-        errorMessage "The response from the IP check server is not an IPv4 address: $remote_ip"
-        return 1
-      fi
-      if [[ $DYNB_UPDATE_METHOD == domrobot ]]
-      then dns_ip=$(getDNSIP A)
-      else
-        if [[ -n $_DNS_checkServer ]]
-        then dig_response=$(dig @"${_DNS_checkServer}" in a +short "$DYNB_DYN_DOMAIN")
-        else dig_response=$(dig in a +short "$DYNB_DYN_DOMAIN")
-        fi
-        if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]
-        then
-          errorMessage "DNS request failed $dig_response"
-          return 1
-        fi
-        # If the dns resolver lists multiple records in the answer section we filter the first line
-        # using short option "-n" and not "--lines" because of alpines limited BusyBox head command
-        dns_ip=$(echo "$dig_response" | head -n 1)
-      fi
       _new_IPv4=$remote_ip
       debugMessage "IPv4 from remote IP check server: $_new_IPv4, IPv4 from DNS: $dns_ip"
-      ;;
+    ;;
     6)
-      remote_ip=$(getRemoteIP 6 $_ipv6_checker)
+      dns_ip=$(getDNSIP AAAA)
-      if ! is_IPv6_address "$remote_ip"
-      then
-        errorMessage "The response from the IP check server is not an IPv6 address: $remote_ip"
-        return 1
-      fi
-      if [[ $DYNB_UPDATE_METHOD == domrobot ]]
-      then dns_ip=$(getDNSIP AAAA)
-      else
-        if [[ -n $_DNS_checkServer ]]
-        then dig_response=$(dig @"${_DNS_checkServer}" in aaaa +short "$DYNB_DYN_DOMAIN")
-        else dig_response=$(dig in aaaa +short "$DYNB_DYN_DOMAIN")
-        fi
-        exitcode=$?
-        if [[ $exitcode -gt 0 ]]
-        then
-          errorMessage "DNS request failed with exit code: $exitcode $dig_response"
-          return 1
-        fi
-        # If the dns server lists multiple records in the answer section we filter the first line
-        dns_ip=$(echo "$dig_response" | head -n 1)
-      fi
       _new_IPv6=$remote_ip
-      debugMessage "IPv6 from remote IP check server: $_new_IPv6, IPv4 from DNS: $dns_ip"
+      debugMessage "IPv6 from remote IP check server: $_new_IPv6, IPv6 from DNS: $dns_ip"
       ;;
     *) ;;
   esac
@@ -554,8 +672,8 @@ function handleParameters
   then rm --verbose "$_statusFile"; exit 0
   fi
   # shellcheck disable=SC2154
-  if [[ $_arg_debug == "on" ]]
+  if [[ $_arg_debug == "on" ]] || [[ $DYNB_DEBUG == true ]]
-  then _debug=1
+  then _debug=true
   fi
   # shellcheck disable=SC2154
   if [[ $_arg_update_method != "" ]]
@@ -595,8 +713,8 @@ function handleParameters
   elif [[ $DYNB_INTERVAL -lt _minimum_looptime ]]
   then
     DYNB_INTERVAL=$_minimum_looptime
-    _loopMode=1
+    _loopMode=true
-  else _loopMode=1
+  else _loopMode=true
   fi
   if [[ $_network_interface != "" ]]
   then _interface_str="--interface $_network_interface"
@@ -614,9 +732,6 @@ function handleParameters
   then _is_IPv6_enabled=true
   fi
 
-  if [[ $DYNB_DEBUG == true ]]
-  then _debug=1
-  fi
   # shellcheck disable=SC2154
   if [[ -n $DYNB_IPv4_CHECK_SITE ]]
   then _ipv4_checker=$DYNB_IPv4_CHECK_SITE
@@ -702,6 +817,15 @@ function doDomrobotUpdates
   fi
 }
 
+function delete_status_file
+{
+  if test -f "$_statusFile"
+  then
+    debugMessage "Delete status file with previous errors"
+    rm "$_statusFile"
+  fi
+}
+
 function doDynDNS2Updates
 {
   changed=0
@@ -711,20 +835,22 @@ function doDynDNS2Updates
   if [[ $_is_IPv6_enabled == true ]] && ipHasChanged 6
   then ((changed += 1))
   fi
-  if [[ $changed -gt 0 ]]
+  if [[ $changed -gt 0 ]] && [[ $_has_remote_ip_error == false ]]
   then
     if checkStatus
     then
       debugMessage "checkStatus has no errors, try update"
       if dynupdate
-      then debugMessage "DynDNS2 update success"
+      then
+        debugMessage "DynDNS2 update success"
+        delete_status_file
       else
         debugMessage "Save new status after dynupdate has failed"
         setStatus "$_response" "$(date +%s)" $((_errorCounter += 1)) "$DYNB_DYN_DOMAIN" "${DYNB_USERNAME}" "${DYNB_PASSWORD}${DYNB_TOKEN}"
       fi
     else debugMessage "Skip DynDNS2 update, checkStatus fetched previous error."
     fi
-  else debugMessage "Skip DynDNS2 update, IPs are up to date or there is a connection problem"
+  else debugMessage "Skip DynDNS2 update"
   fi
 }
 
@@ -739,17 +865,20 @@ function doUpdates
 
 function ipv6_is_not_working
 {
-  curl --ipv6 --head --silent --max-time 5 $_internet_connectivity_test_server > /dev/null
+  execute_connectivity_check 6
-  status_code=$?
+  return $?
-  if test $status_code -gt 0
-  then return 0
-  else return 1
-  fi
 }
 
 function ipv4_is_not_working
 {
-  curl --ipv4 --head --silent --max-time 5 $_internet_connectivity_test_server > /dev/null
+  execute_connectivity_check 4
+  return $?
+}
+
+function execute_connectivity_check
+{
+  local ip_version=$1
+  curl --ipv"$ip_version" --head --silent --max-time 5 $_internet_connectivity_test_server > /dev/null
   status_code=$?
   if test $status_code -gt 0
   then return 0
@@ -777,11 +906,8 @@ function check_internet_connection
   fi
 }
 
-function main
+function read_config_file
 {
-  # shellcheck disable=SC1091,SC1090
-  source "$(dirname "$(realpath "$0")")/dynb-parsing.sh"
-
   # shellcheck source=.env
   if test -f "$_configFile"
   then
@@ -795,6 +921,15 @@ function main
       source "$alternativeConfig"
     fi
   fi
+}
+
+function main
+{
+  # shellcheck disable=SC1091,SC1090
+  source "$(dirname "$(realpath "$0")")/dynb-parsing.sh"
+
+  read_config_file
+
   if test -f "$_statusFile"
   then
     debugMessage "read previous status file"