🐛 fix loop and error handling in case of connection issues

✨ add man page

.dockerignore

@@ -0,0 +1,9 @@
+**/.env
+**/.dockerignore
+**/.docker-compose.debug.yml
+**/.docker-compose.yml
+**/.git
+**/.gitignore
+**/.gitchangelog.rc
+man/man.rst
+man/man-defs.rst

.gitchangelog.rc

@@ -0,0 +1,295 @@
+# -*- coding: utf-8; mode: python -*-
+##
+## Format
+##
+##   ACTION: [AUDIENCE:] COMMIT_MSG [!TAG ...]
+##
+## Description
+##
+##   ACTION is one of 'chg', 'fix', 'new'
+##
+##       Is WHAT the change is about.
+##
+##       'chg' is for refactor, small improvement, cosmetic changes...
+##       'fix' is for bug fixes
+##       'new' is for new features, big improvement
+##
+##   AUDIENCE is optional and one of 'dev', 'usr', 'pkg', 'test', 'doc'
+##
+##       Is WHO is concerned by the change.
+##
+##       'dev'  is for developpers (API changes, refactors...)
+##       'usr'  is for final users (UI changes)
+##       'pkg'  is for packagers   (packaging changes)
+##       'test' is for testers     (test only related changes)
+##       'doc'  is for doc guys    (doc only changes)
+##
+##   COMMIT_MSG is ... well ... the commit message itself.
+##
+##   TAGs are additionnal adjective as 'refactor' 'minor' 'cosmetic'
+##
+##       They are preceded with a '!' or a '@' (prefer the former, as the
+##       latter is wrongly interpreted in github.) Commonly used tags are:
+##
+##       'refactor' is obviously for refactoring code only
+##       'minor' is for a very meaningless change (a typo, adding a comment)
+##       'cosmetic' is for cosmetic driven change (re-indentation, 80-col...)
+##       'wip' is for partial functionality but complete subfunctionality.
+##
+## Example:
+##
+##   new: usr: support of bazaar implemented
+##   chg: re-indentend some lines !cosmetic
+##   new: dev: updated code to be compatible with last version of killer lib.
+##   fix: pkg: updated year of licence coverage.
+##   new: test: added a bunch of test around user usability of feature X.
+##   fix: typo in spelling my name in comment. !minor
+##
+##   Please note that multi-line commit message are supported, and only the
+##   first line will be considered as the "summary" of the commit message. So
+##   tags, and other rules only applies to the summary.  The body of the commit
+##   message will be displayed in the changelog without reformatting.
+
+
+##
+## ``ignore_regexps`` is a line of regexps
+##
+## Any commit having its full commit message matching any regexp listed here
+## will be ignored and won't be reported in the changelog.
+##
+ignore_regexps = [
+    r'@minor', r'!minor',
+    r'@cosmetic', r'!cosmetic',
+    r'@refactor', r'!refactor',
+    r'@wip', r'!wip',
+    r'^([cC]hg|[fF]ix|[nN]ew)\s*:\s*[p|P]kg:',
+    r'^([cC]hg|[fF]ix|[nN]ew)\s*:\s*[d|D]ev:',
+    r'^(.{3,3}\s*:)?\s*[fF]irst commit.?\s*$',
+    r'^$',  ## ignore commits with empty messages
+]
+
+
+## ``section_regexps`` is a list of 2-tuples associating a string label and a
+## list of regexp
+##
+## Commit messages will be classified in sections thanks to this. Section
+## titles are the label, and a commit is classified under this section if any
+## of the regexps associated is matching.
+##
+## Please note that ``section_regexps`` will only classify commits and won't
+## make any changes to the contents. So you'll probably want to go check
+## ``subject_process`` (or ``body_process``) to do some changes to the subject,
+## whenever you are tweaking this variable.
+##
+section_regexps = [
+    ('New', [
+        r'^:sparkles\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+     ]),
+    ('Changes', [
+        r'^:wrench\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+     ]),
+    ('Fix', [
+        r'^:bug\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+     ]),
+    ('Documentation', [
+        r'^:memo\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+     ]),     
+    ('Remove', [
+        r'^:fire\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+     ]),     
+
+    ('Other', None ## Match all lines
+     ),
+
+]
+
+
+## ``body_process`` is a callable
+##
+## This callable will be given the original body and result will
+## be used in the changelog.
+##
+## Available constructs are:
+##
+##   - any python callable that take one txt argument and return txt argument.
+##
+##   - ReSub(pattern, replacement): will apply regexp substitution.
+##
+##   - Indent(chars="  "): will indent the text with the prefix
+##     Please remember that template engines gets also to modify the text and
+##     will usually indent themselves the text if needed.
+##
+##   - Wrap(regexp=r"\n\n"): re-wrap text in separate paragraph to fill 80-Columns
+##
+##   - noop: do nothing
+##
+##   - ucfirst: ensure the first letter is uppercase.
+##     (usually used in the ``subject_process`` pipeline)
+##
+##   - final_dot: ensure text finishes with a dot
+##     (usually used in the ``subject_process`` pipeline)
+##
+##   - strip: remove any spaces before or after the content of the string
+##
+##   - SetIfEmpty(msg="No commit message."): will set the text to
+##     whatever given ``msg`` if the current text is empty.
+##
+## Additionally, you can `pipe` the provided filters, for instance:
+#body_process = Wrap(regexp=r'\n(?=\w+\s*:)') | Indent(chars="  ")
+#body_process = Wrap(regexp=r'\n(?=\w+\s*:)')
+#body_process = noop
+body_process = ReSub(r'((^|\n)[A-Z]\w+(-\w+)*: .*(\n\s+.*)*)+$', r'') | strip
+
+
+## ``subject_process`` is a callable
+##
+## This callable will be given the original subject and result will
+## be used in the changelog.
+##
+## Available constructs are those listed in ``body_process`` doc.
+subject_process = (strip |
+    ReSub(r'^([cC]hg|[fF]ix|[nN]ew)\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n@]*)(@[a-z]+\s+)*$', r'\4') |
+    SetIfEmpty("No commit message.") | ucfirst | final_dot)
+
+
+## ``tag_filter_regexp`` is a regexp
+##
+## Tags that will be used for the changelog must match this regexp.
+##
+tag_filter_regexp = r'^[0-9]+\.[0-9]+(\.[0-9]+)?$'
+
+
+## ``unreleased_version_label`` is a string or a callable that outputs a string
+##
+## This label will be used as the changelog Title of the last set of changes
+## between last valid tag and HEAD if any.
+unreleased_version_label = "(unreleased)"
+
+
+## ``output_engine`` is a callable
+##
+## This will change the output format of the generated changelog file
+##
+## Available choices are:
+##
+##   - rest_py
+##
+##        Legacy pure python engine, outputs ReSTructured text.
+##        This is the default.
+##
+##   - mustache(<template_name>)
+##
+##        Template name could be any of the available templates in
+##        ``templates/mustache/*.tpl``.
+##        Requires python package ``pystache``.
+##        Examples:
+##           - mustache("markdown")
+##           - mustache("restructuredtext")
+##
+##   - makotemplate(<template_name>)
+##
+##        Template name could be any of the available templates in
+##        ``templates/mako/*.tpl``.
+##        Requires python package ``mako``.
+##        Examples:
+##           - makotemplate("restructuredtext")
+##
+#output_engine = rest_py
+#output_engine = mustache("restructuredtext")
+output_engine = mustache("markdown")
+#output_engine = makotemplate("restructuredtext")
+
+
+## ``include_merge`` is a boolean
+##
+## This option tells git-log whether to include merge commits in the log.
+## The default is to include them.
+include_merge = True
+
+
+## ``log_encoding`` is a string identifier
+##
+## This option tells gitchangelog what encoding is outputed by ``git log``.
+## The default is to be clever about it: it checks ``git config`` for
+## ``i18n.logOutputEncoding``, and if not found will default to git's own
+## default: ``utf-8``.
+#log_encoding = 'utf-8'
+
+
+## ``publish`` is a callable
+##
+## Sets what ``gitchangelog`` should do with the output generated by
+## the output engine. ``publish`` is a callable taking one argument
+## that is an interator on lines from the output engine.
+##
+## Some helper callable are provided:
+##
+## Available choices are:
+##
+##   - stdout
+##
+##        Outputs directly to standard output
+##        (This is the default)
+##
+##   - FileInsertAtFirstRegexMatch(file, pattern, idx=lamda m: m.start())
+##
+##        Creates a callable that will parse given file for the given
+##        regex pattern and will insert the output in the file.
+##        ``idx`` is a callable that receive the matching object and
+##        must return a integer index point where to insert the
+##        the output in the file. Default is to return the position of
+##        the start of the matched string.
+##
+##   - FileRegexSubst(file, pattern, replace, flags)
+##
+##        Apply a replace inplace in the given file. Your regex pattern must
+##        take care of everything and might be more complex. Check the README
+##        for a complete copy-pastable example.
+##
+# publish = FileInsertIntoFirstRegexMatch(
+#     "CHANGELOG.rst",
+#     r'/(?P<rev>[0-9]+\.[0-9]+(\.[0-9]+)?)\s+\([0-9]+-[0-9]{2}-[0-9]{2}\)\n--+\n/',
+#     idx=lambda m: m.start(1)
+# )
+#publish = stdout
+
+
+## ``revs`` is a list of callable or a list of string
+##
+## callable will be called to resolve as strings and allow dynamical
+## computation of these. The result will be used as revisions for
+## gitchangelog (as if directly stated on the command line). This allows
+## to filter exaclty which commits will be read by gitchangelog.
+##
+## To get a full documentation on the format of these strings, please
+## refer to the ``git rev-list`` arguments. There are many examples.
+##
+## Using callables is especially useful, for instance, if you
+## are using gitchangelog to generate incrementally your changelog.
+##
+## Some helpers are provided, you can use them::
+##
+##   - FileFirstRegexMatch(file, pattern): will return a callable that will
+##     return the first string match for the given pattern in the given file.
+##     If you use named sub-patterns in your regex pattern, it'll output only
+##     the string matching the regex pattern named "rev".
+##
+##   - Caret(rev): will return the rev prefixed by a "^", which is a
+##     way to remove the given revision and all its ancestor.
+##
+## Please note that if you provide a rev-list on the command line, it'll
+## replace this value (which will then be ignored).
+##
+## If empty, then ``gitchangelog`` will act as it had to generate a full
+## changelog.
+##
+## The default is to use all commits to make the changelog.
+#revs = ["^1.0.3", ]
+#revs = [
+#    Caret(
+#        FileFirstRegexMatch(
+#            "CHANGELOG.rst",
+#            r"(?P<rev>[0-9]+\.[0-9]+(\.[0-9]+)?)\s+\([0-9]+-[0-9]{2}-[0-9]{2}\)\n--+\n")),
+#    "HEAD"
+#]
+revs = []

.gitignore

@@ -0,0 +1,2 @@
+.env*
+docker-compose*

CHANGELOG.md

@@ -0,0 +1,69 @@
+# Changelog
+
+
+## 0.1.1 (2021-04-23)
+
+### Fix
+
+* :bug: fix loop and error handling in case of connection issues. [Eduard Veit]
+
+
+## 0.1.0 (2021-04-22)
+
+### New
+
+* :sparkles: add Dockerfile. [Eduard Veit]
+
+* :sparkles: add loop mode. [Eduard Veit]
+
+* :sparkles: add support for Duck DNS as DynDNS2 provider. [Eduard Veit]
+
+* :sparkles: add support for deSEC as DynDNS2 provider. [Eduard Veit]
+
+* :sparkles: add completion. [Eduard Veit]
+
+  :sparkles: add man page
+
+* :sparkles: replace getopt with argbash. [Eduard Veit]
+
+* :sparkles: add interpretaton of status codes and act accordingly. [Eduard Veit]
+
+* :sparkles: make network interface configurable. [Eduard Veit]
+
+* :sparkles: add DynDNS2 support for dynv6.com. [Eduard Veit]
+
+* :sparkles: add .gitchangelog.rc. [Eduard Veit]
+
+* :sparkles: add dynb.sh. [Eduard Veit]
+
+### Fix
+
+* :bug: fix sourcing of config file. [Eduard Veit]
+
+  :recycle: do some shellcheck fixes
+
+### Documentation
+
+* :memo: document example of an docker-compose.yml file. [Eduard Veit]
+
+* :memo: document loop mode and dig as requirement. [Eduard Veit]
+
+* :memo: update example of .env in README.md. [Eduard Veit]
+
+* :memo: add CHANGELOG.md. [Eduard Veit]
+
+* :memo: add example.env. [Eduard Veit]
+
+* :memo: write README.md. [Eduard Veit]
+
+### Other
+
+* :recycle: refactor: rename environment variables. [Eduard Veit]
+
+* :recycle: refactor, fix and debug error handling. [Eduard Veit]
+
+* :recycle: refactor main code. [Eduard Veit]
+
+* Initial commit. [EV21]
+
+

Dockerfile

@@ -0,0 +1,5 @@
+FROM alpine:latest
+RUN apk update && apk add bash curl jq bind-tools
+WORKDIR /usr/src/app
+COPY . .
+CMD /bin/bash /usr/src/app/dynb.sh

README.md

@@ -1,2 +1,142 @@
-# dynb
-dynb - dynamic DNS update script for bash
+# 🔃 DynB
+DynB - dynamic DNS update script, written in bash
+
+IPv4 (A) and IPv6 (AAAA) record updates are supported.
+<!-- TOC -->
+- [✨ Update Methods](#-update-methods)
+    - [APIs](#apis)
+    - [DynDNS2](#dyndns2)
+- [📦 Requirements](#-requirements)
+- [🚀 Installation](#-installation)
+- [⚙ Configuration](#-configuration)
+- [🏃 Run](#-run)
+- [⏰ Cron](#-cron)
+- [⏰ docker](#-docker)
+<!-- /TOC -->
+
+## ✨ Update Methods
+The following update methods are currently implemented:
+
+### APIs
+
+* INWX.com Domrobot JSON-RPC-API  
+  Limitations:
+  - minimum TTL is 300 (5 minutes)
+
+### DynDNS2
+
+* INWX.com  
+* deSEC.io (dedyn.io)  
+* DuckDNS.org  
+* dynv6.com  
+
+## 📦 Requirements
+
+* `curl` - The minimum requirement for all API requests.
+* `dig` - You can get it by installing `dnsutils` (debian/ubuntu/ArchLinux), `bind-utils` (CentOS/RHEL), `bind-tools` (Alpine)
+
+also essential if you are using other APIs:
+
+* `jq` - Command-line JSON processor
+
+## 🚀 Installation
+
+Download the latest release
+
+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:
+```
+bash dynb.sh --link
+```
+
+## ⚙ Configuration
+
+You can use a config in form of an `.env` file.
+Or you can just use CLI parameters.
+
+Create `.env` in the app root directory or at `~/.local/share/dynb/.env`.
+```
+DYNB_DYN_DOMAIN=dyndns.example.com
+
+## service provider could be deSEC, duckdns, dynv6, inwx
+DYNB_SERVICE_PROVIDER=inwx
+
+## update method options: domrobot, dyndns
+DYNB_UPDATE_METHOD=domrobot
+
+## ip mode could be either: 4, 6 or dual for dualstack
+DYNB_IP_MODE=64
+
+## 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
+DYNB_USERNAME=User42
+DYNB_PASSWORD=SuperSecretPassword
+## or use a token
+DYNB_TOKEN=
+```
+
+## 🏃 Run
+
+If you have a config file just run :point_down:
+```
+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:
+```
+dynb --help
+```
+```
+dynb --ip-mode dualstack --update-method domrobot --domain dyndns.example.com --username user42 --password SuperSecretPassword
+```
+```
+dynb --ip-mode dualstack --update-method dyndns --provider inwx --domain dyndns.example.com --username user42 --password SuperSecretPassword
+```
+
+## ⏰ Cron
+
+To automatically call the script you can use either crontab or the script can also run in a loop mode.
+
+### loop mode
+
+Just use the parameter `--interval 60` or the environment variable `DYNB_INTERVAL=60` so the script will check every 60 seconds if it needs to do an update.
+
+### crontab
+
+execute :point_down:
+```
+crontab -e
+```
+then enter :point_down: to run dynb every five minutes.
+```
+*/5 * * * * $HOME/.local/bin/dynb >> $HOME/.local/share/dynb/dynb-cron.log
+```
+Note, cron typically does not use the users PATH variable.
+
+## 🐟 docker
+
+This is an example of a `docker-compose.yml` file. If you are using IPv6 make sure the routing works properly with your docker container.
+```yaml
+version: '3.4'
+
+services:
+  dynb:
+    image: ev21/dynb
+    container_name: dynb
+    network_mode: host
+    build:
+      context: .
+      dockerfile: ./Dockerfile
+    environment:
+      - DYNB_DYN_DOMAIN=dyndns.example.com
+      - DYNB_SERVICE_PROVIDER=inwx
+      - DYNB_UPDATE_METHOD=dyndns
+      - DYNB_IP_MODE=64
+      - DYNB_USERNAME=User42
+      - DYNB_PASSWORD=SuperSecretPassword
+      - DYNB_INTERVAL=60
+```

_dynb.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# Put this file to /etc/bash_completion.d/dynb.sh
+# needed because of Argbash --> m4_ignore([
+### START OF CODE GENERATED BY Argbash v2.10.0 one line above ###
+# Argbash is a bash code generator used to get arguments parsing right.
+# Argbash is FREE SOFTWARE, see https://argbash.io for more info
+
+_dynb_sh ()
+{
+	local cur prev opts base
+	COMPREPLY=()
+	cur="${COMP_WORDS[COMP_CWORD]}"
+	prev="${COMP_WORDS[COMP_CWORD-1]}"
+	all_long_opts="--version --link --reset --debug --update-method --ip-mode --domain --service-provider --username --password --token --interval --help "
+	all_short_opts="-v -l -r -m -i -d -s -u -p -t -h "
+	case "$prev" in
+		--update-method|-m|--ip-mode|-i|--domain|-d|--service-provider|-s|--username|-u|--password|-p|--token|-t|--interval)
+			COMPREPLY=( $(compgen -o bashdefault -o default -- "${cur}") )
+			return 0
+			;;
+		*)
+			case "$cur" in
+				--*)
+					COMPREPLY=( $(compgen -W "${all_long_opts}" -- "${cur}") )
+					return 0
+					;;
+				-*)
+					COMPREPLY=( $(compgen -W "${all_short_opts}" -- "${cur}") )
+					return 0
+					;;
+				*)
+					COMPREPLY=( $(compgen -o bashdefault -o default -- "${cur}") )
+					return 0
+					;;
+			esac
+	esac
+
+}
+complete -F _dynb_sh dynb.sh
+### END OF CODE GENERATED BY Argbash (sortof) ### ])

dynb.sh

@@ -0,0 +1,926 @@
+#!/usr/bin/env bash
+
+## Copyright (c) 2021 Eduard Veit
+## All rights reserved. This program and the accompanying materials
+## are made available under the terms of the MIT license
+## which accompanies this distribution, and is available at
+## https://opensource.org/licenses/MIT
+
+###################
+## Configuration ##
+###################
+
+#DYNB_DYN_DOMAIN=
+
+## 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
+#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 DynDNS2 protocol enter your credentials here
+#DYNB_USERNAME=
+#DYNB_PASSWORD=
+## or use a token
+#DYNB_TOKEN=
+
+## TTL (time to live) for the DNS record
+## This setting is only relevant for API based record updates (not DnyDNS2!)
+## 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)
+## Pro tip: use your own ip check server for privacy
+## it could be as simple as that...
+## create an index.php with <?php echo $_SERVER'REMOTE_ADDR'; ?>
+_ipv4_checker=api64.ipify.org
+_ipv6_checker=api64.ipify.org
+
+## An exernal DNS check server prevents wrong info from local DNS servers/resolvers
+_DNS_checkServer=1.1.1.1
+
+## if you are actively using multiple network interfaces you might want to specify this
+## normally the default value is okay
+#_network_interface=eth0
+_network_interface=
+
+######################################################
+## You don't need to change the following variables ##
+_INWX_JSON_API_URL=https://api.domrobot.com/jsonrpc/
+_new_IPv4=
+_new_IPv6=
+_dns_records=
+_main_domain=
+_is_IPv4_enabled=false
+_is_IPv6_enabled=false
+_interface_str=
+_status=
+_eventTime=0
+_errorCounter=0
+_response=
+_statusHostname=
+_statusUsername=
+_statusPassword=
+_version=0.1.1
+_userAgent="DynB/$_version github.com/EV21/dynb"
+_configFile=$HOME/.local/share/dynb/.env
+_statusFile=/tmp/dynb.status
+_debug=0
+_minimum_looptime=60
+_loopMode=0
+
+# Created by argbash-init v2.10.0
+# Rearrange the order of options below according to what you would like to see in the help message.
+# ARG_OPTIONAL_BOOLEAN([version],[v],[outputs the client version],[off])
+# ARG_OPTIONAL_BOOLEAN([link],[l],[links to your script at ~/.local/bin/dynb],[off])
+# ARG_OPTIONAL_BOOLEAN([reset],[r],[deletes the client blocking status file],[off])
+# ARG_OPTIONAL_BOOLEAN([debug],[],[enables debug mode],[off])
+# ARG_OPTIONAL_SINGLE([update-method],[m],[choose if you want to use DynDNS2 or the DomRobot RPC-API],[])
+# ARG_OPTIONAL_SINGLE([ip-mode],[i],[updates type A (IPv4) and AAAA (IPv6) records],[])
+# ARG_OPTIONAL_SINGLE([domain],[d],[set the domain you want to update],[])
+# ARG_OPTIONAL_SINGLE([service-provider],[s],[set your provider in case you are using DynDNS2],[])
+# ARG_OPTIONAL_SINGLE([username],[u],[depends on your selected update method and your provider],[])
+# ARG_OPTIONAL_SINGLE([password],[p],[depends on your selected update method and your provider],[])
+# ARG_OPTIONAL_SINGLE([token],[t],[depends on your selected update method and your provider],[])
+# ARG_OPTIONAL_SINGLE([interval],[],[choose the seconds interval to run the script in a loop, minimum is 60],[])
+# ARG_HELP([DynB - dynamic DNS update script for bash])
+# ARGBASH_GO()
+# needed because of Argbash --> m4_ignore([
+### START OF CODE GENERATED BY Argbash v2.10.0 one line above ###
+# Argbash is a bash code generator used to get arguments parsing right.
+# Argbash is FREE SOFTWARE, see https://argbash.io for more info
+
+
+die()
+{
+	local _ret="${2:-1}"
+	test "${_PRINT_HELP:-no}" = yes && print_help >&2
+	echo "$1" >&2
+	exit "${_ret}"
+}
+
+
+begins_with_short_option()
+{
+	local first_option all_short_options='vlrmidsupth'
+	first_option="${1:0:1}"
+	test "$all_short_options" = "${all_short_options/$first_option/}" && return 1 || return 0
+}
+
+# THE DEFAULTS INITIALIZATION - OPTIONALS
+_arg_version="off"
+_arg_link="off"
+_arg_reset="off"
+_arg_debug="off"
+_arg_update_method=
+_arg_ip_mode=
+_arg_domain=
+_arg_service_provider=
+_arg_username=
+_arg_password=
+_arg_token=
+_arg_interval=
+
+
+print_help()
+{
+	printf '%s\n' "DynB - dynamic DNS update script for bash"
+	printf 'Usage: %s [-v|--(no-)version] [-l|--(no-)link] [-r|--(no-)reset] [--(no-)debug] [-m|--update-method <arg>] [-i|--ip-mode <arg>] [-d|--domain <arg>] [-s|--service-provider <arg>] [-u|--username <arg>] [-p|--password <arg>] [-t|--token <arg>] [--interval <arg>] [-h|--help]\n' "$0"
+	printf '\t%s\n' "-v, --version, --no-version: outputs the client version (off by default)"
+	printf '\t%s\n' "-l, --link, --no-link: links to your script at ~/.local/bin/dynb (off by default)"
+	printf '\t%s\n' "-r, --reset, --no-reset: deletes the client blocking status file (off by default)"
+	printf '\t%s\n' "--debug, --no-debug: enables debug mode (off by default)"
+	printf '\t%s\n' "-m, --update-method: choose if you want to use DynDNS2 or the DomRobot RPC-API (no default)"
+	printf '\t%s\n' "-i, --ip-mode: updates type A (IPv4) and AAAA (IPv6) records (no default)"
+	printf '\t%s\n' "-d, --domain: set the domain you want to update (no default)"
+	printf '\t%s\n' "-s, --service-provider: set your provider in case you are using DynDNS2 (no default)"
+	printf '\t%s\n' "-u, --username: depends on your selected update method and your provider (no default)"
+	printf '\t%s\n' "-p, --password: depends on your selected update method and your provider (no default)"
+	printf '\t%s\n' "-t, --token: depends on your selected update method and your provider (no default)"
+	printf '\t%s\n' "--interval: choose the seconds interval to run the script in a loop, minimum is 60 (no default)"
+	printf '\t%s\n' "-h, --help: Prints help"
+}
+
+
+parse_commandline()
+{
+	while test $# -gt 0
+	do
+		_key="$1"
+		case "$_key" in
+			-v|--no-version|--version)
+				_arg_version="on"
+				test "${1:0:5}" = "--no-" && _arg_version="off"
+				;;
+			-v*)
+				_arg_version="on"
+				_next="${_key##-v}"
+				if test -n "$_next" -a "$_next" != "$_key"
+				then
+					{ begins_with_short_option "$_next" && shift && set -- "-v" "-${_next}" "$@"; } || die "The short option '$_key' can't be decomposed to ${_key:0:2} and -${_key:2}, because ${_key:0:2} doesn't accept value and '-${_key:2:1}' doesn't correspond to a short option."
+				fi
+				;;
+			-l|--no-link|--link)
+				_arg_link="on"
+				test "${1:0:5}" = "--no-" && _arg_link="off"
+				;;
+			-l*)
+				_arg_link="on"
+				_next="${_key##-l}"
+				if test -n "$_next" -a "$_next" != "$_key"
+				then
+					{ begins_with_short_option "$_next" && shift && set -- "-l" "-${_next}" "$@"; } || die "The short option '$_key' can't be decomposed to ${_key:0:2} and -${_key:2}, because ${_key:0:2} doesn't accept value and '-${_key:2:1}' doesn't correspond to a short option."
+				fi
+				;;
+			-r|--no-reset|--reset)
+				_arg_reset="on"
+				test "${1:0:5}" = "--no-" && _arg_reset="off"
+				;;
+			-r*)
+				_arg_reset="on"
+				_next="${_key##-r}"
+				if test -n "$_next" -a "$_next" != "$_key"
+				then
+					{ begins_with_short_option "$_next" && shift && set -- "-r" "-${_next}" "$@"; } || die "The short option '$_key' can't be decomposed to ${_key:0:2} and -${_key:2}, because ${_key:0:2} doesn't accept value and '-${_key:2:1}' doesn't correspond to a short option."
+				fi
+				;;
+			--no-debug|--debug)
+				_arg_debug="on"
+				test "${1:0:5}" = "--no-" && _arg_debug="off"
+				;;
+			-m|--update-method)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_update_method="$2"
+				shift
+				;;
+			--update-method=*)
+				_arg_update_method="${_key##--update-method=}"
+				;;
+			-m*)
+				_arg_update_method="${_key##-m}"
+				;;
+			-i|--ip-mode)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_ip_mode="$2"
+				shift
+				;;
+			--ip-mode=*)
+				_arg_ip_mode="${_key##--ip-mode=}"
+				;;
+			-i*)
+				_arg_ip_mode="${_key##-i}"
+				;;
+			-d|--domain)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_domain="$2"
+				shift
+				;;
+			--domain=*)
+				_arg_domain="${_key##--domain=}"
+				;;
+			-d*)
+				_arg_domain="${_key##-d}"
+				;;
+			-s|--service-provider)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_service_provider="$2"
+				shift
+				;;
+			--service-provider=*)
+				_arg_service_provider="${_key##--service-provider=}"
+				;;
+			-s*)
+				_arg_service_provider="${_key##-s}"
+				;;
+			-u|--username)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_username="$2"
+				shift
+				;;
+			--username=*)
+				_arg_username="${_key##--username=}"
+				;;
+			-u*)
+				_arg_username="${_key##-u}"
+				;;
+			-p|--password)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_password="$2"
+				shift
+				;;
+			--password=*)
+				_arg_password="${_key##--password=}"
+				;;
+			-p*)
+				_arg_password="${_key##-p}"
+				;;
+			-t|--token)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_token="$2"
+				shift
+				;;
+			--token=*)
+				_arg_token="${_key##--token=}"
+				;;
+			-t*)
+				_arg_token="${_key##-t}"
+				;;
+			--interval)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_interval="$2"
+				shift
+				;;
+			--interval=*)
+				_arg_interval="${_key##--interval=}"
+				;;
+			-h|--help)
+				print_help
+				exit 0
+				;;
+			-h*)
+				print_help
+				exit 0
+				;;
+			*)
+				_PRINT_HELP=yes die "FATAL ERROR: Got an unexpected argument '$1'" 1
+				;;
+		esac
+		shift
+	done
+}
+
+parse_commandline "$@"
+
+# OTHER STUFF GENERATED BY Argbash
+
+### END OF CODE GENERATED BY Argbash (sortof) ### ])
+# [ <-- needed because of Argbash
+
+# The generated argbash help message does not look as nice as this:
+_help_message="$(cat << 'EOF'
+dynb - dynamic DNS update script for bash
+
+Usage
+=====
+dynb [options]
+
+-h, --help                                displays this help message
+--version                                 outputs the client version
+--link                                    links to your script at ~/.local/bin/dynb
+--reset                                   deletes the client blocking status file
+
+Configuration options
+---------------------
+-i | --ip-mode [ 4 | 6 | dual ]           updates type A (IPv4) and AAAA (IPv6) records
+-m | --update-method [dyndns | domrobot]  choose if you want to use DynDNS2 or the DomRobot RPC-API
+-s | --service-provider inwx              set your provider in case you are using DynDNS2
+-d | --domain "dyndns.example.com"        set the domain you want to update
+-u | --username "user42"                  depends on your selected update method and your provider
+-p | --password "SuperSecretPassword"     depends on your selected update method and your provider
+-t | --token "YourProviderGivenToken"     depends on your selected update method and your provider
+
+##### examples #####
+dynb --ip-mode dual --update-method domrobot --domain dyndns.example.com --username user42 --password SuperSecretPassword
+dynb --ip-mode dual --update-method dyndns --service-provider inwx --domain dyndns.example.com --username user42 --password SuperSecretPassword
+EOF
+)"
+
+function loopMode() {
+  if [[ $_loopMode -eq 1 ]]; then
+    return 0
+  else
+    return 1
+  fi
+}
+
+function debugMode() {
+  if [[ $_debug -eq 1 ]]; then
+    return 0
+  else
+    return 1
+  fi
+}
+
+function debugMessage() {
+  if debugMode; then
+    echo "Debug: $*"
+  fi
+}
+
+function echoerr() { printf "%s\n" "$*" >&2; }
+
+# The main domain as an identifier for the dns zone is required for the updateRecord call
+function getMainDomain() {
+  request=$( echo "{}" | \
+      jq '(.method="nameserver.list")' | \
+      jq "(.params.user=\"$DYNB_USERNAME\")" | \
+      jq "(.params.pass=\"$DYNB_PASSWORD\")"
+    )
+
+  _response=$(curl --silent  \
+      "$_interface_str" \
+      --user-agent "$_userAgent" \
+      --header "Content-Type: application/json" \
+      --request POST $_INWX_JSON_API_URL \
+      --data "$request" | jq ".resData.domains[] | select(inside(.domain=\"$DYNB_DYN_DOMAIN\"))"
+    )
+  _main_domain=$( echo "$_response" | jq --raw-output '.domain'  )
+}
+
+function fetchDNSRecords() {
+  request=$( echo "{}" | \
+      jq '(.method="'nameserver.info'")' | \
+      jq "(.params.user=\"$DYNB_USERNAME\")" | \
+      jq "(.params.pass=\"$DYNB_PASSWORD\")" | \
+      jq "(.params.domain=\"$_main_domain\")" | \
+      jq "(.params.name=\"$DYNB_DYN_DOMAIN\")"
+    )
+
+  _response=$( curl --silent  \
+      "$_interface_str" \
+      --user-agent "$_userAgent" \
+      --header "Content-Type: application/json" \
+      --request POST $_INWX_JSON_API_URL \
+      --data "$request"
+    )
+
+  _dns_records=$( echo "$_response" | jq '.resData.record[]' )
+}
+
+# requires parameter A or AAAA
+# result to stdout
+function getRecordID() {
+  echo "$_dns_records" | jq "select(.type == \"${1}\") | .id"
+}
+
+# requires parameter A or AAAA
+# result to stdout
+function getDNSIP() {
+  echo "$_dns_records" | jq --raw-output "select(.type == \"${1}\") | .content"
+}
+
+# requires parameter
+# 1. param: 4 or 6 for ip version
+# 2. param: IP check server address
+# result to stdout
+function getRemoteIP() {
+  curl --silent "$_interface_str" --user-agent "$_userAgent" \
+    --ipv"${1}" --dns-servers 1.1.1.1 --location "${2}"
+}
+
+# requires parameter
+# 1. param: 4 or 6 as ip version
+function updateRecord() {
+  if [[ ${1} == 4 ]]; then
+    ID=$(getRecordID A)
+    IP=$_new_IPv4
+  fi
+  if [[ ${1} == 6 ]]; then
+    ID=$(getRecordID AAAA)
+    IP=$_new_IPv6
+  fi
+  if [[ $IP != "" ]]; then
+  request=$( echo "{}" | \
+      jq '(.method="nameserver.updateRecord")' | \
+      jq "(.params.user=\"$DYNB_USERNAME\")" | \
+      jq "(.params.pass=\"$DYNB_PASSWORD\")" | \
+      jq "(.params.id=\"$ID\")" | \
+      jq "(.params.content=\"$IP\")" | \
+      jq "(.params.ttl=\"$TTL\")"
+    )
+
+  _response=$(curl --silent  \
+      "$_interface_str" \
+      --user-agent "$_userAgent" \
+      --header "Content-Type: application/json" \
+      --request POST $_INWX_JSON_API_URL \
+      --data "$request"
+     )
+     echo -e "$(echo "$_response" | jq --raw-output '.msg')\n Domain: $DYNB_DYN_DOMAIN\n new IPv${1}: $IP"
+  fi
+}
+
+# using DynDNS2 protocol
+function dynupdate() {
+  # default parameter values
+  myip_str=myip
+  myipv6_str=myipv6
+
+  INWX_DYNDNS_UPDATE_URL="https://dyndns.inwx.com/nic/update?"
+  DESEC_DYNDNS_UPDATE_URL="https://update.dedyn.io/?"
+  DUCKDNS_DYNDNS_UPDATE_URL="https://www.duckdns.org/update?domains=$DYNB_DYN_DOMAIN&token=$DYNB_TOKEN&"
+  DYNV6_DYNDNS_UPDATE_URL="https://dynv6.com/api/update?zone=$DYNB_DYN_DOMAIN&token=$DYNB_TOKEN&"
+
+  case $DYNB_SERVICE_PROVIDER in
+    inwx* | INWX* )
+      dyndns_update_url=$INWX_DYNDNS_UPDATE_URL
+    ;;
+    deSEC* | desec* | dedyn* )
+      dyndns_update_url="${DESEC_DYNDNS_UPDATE_URL}"
+    ;;
+    dynv6* )
+      dyndns_update_url="${DYNV6_DYNDNS_UPDATE_URL}"
+      myip_str=ipv4
+      myipv6_str=ipv6
+    ;;
+    DuckDNS* | duckdns* )
+      dyndns_update_url="${DUCKDNS_DYNDNS_UPDATE_URL}"
+      myip_str=ipv4
+      myipv6_str=ipv6
+    ;;
+    * )
+    echoerr "$DYNB_SERVICE_PROVIDER is not supported"
+    exit 1
+    ;;
+  esac
+
+  # pre encode ip parameters
+  if [[ $_is_IPv4_enabled == true ]] && [[ $_is_IPv6_enabled == true ]]; then
+    dyndns_update_url="${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 ##
+  case $DYNB_SERVICE_PROVIDER in
+    inwx* | INWX* )
+      _response=$(curl --silent "$_interface_str" \
+      --user-agent "$_userAgent" \
+      --user "$DYNB_USERNAME":"$DYNB_PASSWORD" \
+      "${dyndns_update_url}" )
+    ;;
+    deSEC* | desec* | dedyn* )
+      _response=$(curl --silent "$_interface_str" \
+      --user-agent "$_userAgent" \
+      --header "Authorization: Token $DYNB_TOKEN" \
+      --get --data-urlencode "hostname=$DYNB_DYN_DOMAIN" \
+      "${dyndns_update_url}" )
+    ;;
+    dynv6* | duckDNS* | duckdns* )
+      _response=$(curl --silent "$_interface_str" \
+        --user-agent "$_userAgent" \
+        "${dyndns_update_url}"
+      )
+    ;;
+  esac
+
+  case $_response in
+    good* | OK* | "addresses updated" )
+      if [[ $_response == "good 127.0.0.1" ]]; then
+        echoerr "Error: $_response: Request ignored."
+        return 1
+      else
+        echo "$_response: The DynDNS update has been executed."
+        _errorCounter=0
+        return 0
+      fi
+    ;;
+    nochg* )
+      echo "$_response: Nothing has changed, IP addresses are still up to date."
+      return 1
+    ;;
+    abuse )
+      echoerr "Error: $_response: Username is blocked due to abuse."
+      return 1
+    ;;
+    badauth | 401 )
+      echoerr "Error: $_response: Invalid username password combination."
+      return 1
+    ;;
+    badagent )
+      echoerr "Error: $_response: Client disabled. Something is very wrong!"
+      return 1
+    ;;
+    !donator )
+      echoerr "Error: $_response: An update request was sent, including a feature that is not available to that particular user such as offline options."
+      return 1
+    ;;
+    !yours )
+      echoerr "Error: $_response: The domain does not belong to your user account"
+      return 1
+    ;;
+    notfqdn )
+      echoerr "Error: $_response: Hostname $DYNB_DYN_DOMAIN is invalid"
+      return 1
+    ;;
+    nohost )
+      echoerr "Error: $_response: Hostname supplied does not exist under specified account, enter new login credentials before performing an additional request."
+      return 1
+    ;;
+    numhost )
+      echoerr "Error: $_response: Too many hostnames have been specified for this update"
+      return 1
+    ;;
+    dnserr )
+      echoerr "Error: $_response: There is an internal error in the dyndns update system. Retry update no sooner than 30 minutes."
+      return 1
+    ;;
+    911 | 5* )
+      echoerr "Error: $_response: A fatal error on provider side such as a database outage. Retry update no sooner than 30 minutes."
+      return 1
+    ;;
+    * )
+      if [[ "$_response" == "$_status" ]]; then
+        echoerr "Error: An unknown response code has been received. $_response"
+        return 1
+      else
+        echoerr "Error: unknown respnse code: $_response"
+        return 0
+      fi
+    ;;
+  esac
+}
+
+function setStatus() {
+  echo "_status=$1; _eventTime=$2; _errorCounter=$3; _statusHostname=$4; _statusUsername=$5; _statusPassword=$6" > /tmp/dynb.status
+}
+
+# handle errors from past update requests
+function checkStatus() {
+  case $_status in
+    nochg* )
+      if [[ _errorCounter -gt 1 ]]; then
+        echoerr "Error: The update client was spamming unnecessary update requests, something might be wrong with your IP-Check site."
+        echoerr "Fix your config an then delete $_statusFile"
+        return 1
+      fi
+    ;;
+    nohost | !yours )
+      if [[ "$_statusHostname" == "$DYNB_DYN_DOMAIN" && ( "$_statusUsername" == "$DYNB_USERNAME" || $_statusUsername == "$DYNB_TOKEN" ) ]]; then
+        echoerr "Error: Hostname supplied does not exist under specified account, enter new login credentials before performing an additional request."
+        return 1
+      else
+        rm "$_statusFile"
+      fi
+      return 0
+    ;;
+    badauth | 401 )
+      if [[ "$_statusUsername" == "$DYNB_USERNAME" && "$_statusPassword" == "$DYNB_PASSWORD" ]]; then
+        echoerr "Error: Invalid username password combination."
+        return 1
+      else
+        rm "$_statusFile"
+      fi
+      return 0
+    ;;
+    badagent )
+      echoerr "Error: Client is deactivated by provider."
+      echo "Fix your config and then manually remove $_statusFile to reset the client blockade."
+      echo "If it still fails file an issue at github or try another client :)"
+      return 1
+    ;;
+    !donator )
+      echoerr "Error: An update request was sent, including a feature that is not available to that particular user such as offline options."
+      echo "Fix your config and then manually remove $_statusFile to reset the client blockade"
+      echo "If it still fails file an issue at github or try another client :)"
+      return 1
+    ;;
+    abuse )
+      echoerr "Error: Username is blocked due to abuse."
+      echo "Fix your config and then manually remove $_statusFile to reset the client blockade"
+      echo "If it still fails file an issue at github or try another client :)"
+      return 1
+    ;;
+    911 | 5* )
+      delta=$(( $(date +%s) - _eventTime ))
+      if [[ $delta -lt 1800 ]]; then
+        echoerr "$_status: The provider currently has an fatal error. DynB will wait for next update until 30 minutes have passed since last request, $(date --date=@$delta -u +%M) minutes already passed."
+        return 1
+      else
+        rm "$_statusFile"
+      fi
+      return 0
+    ;;
+    * )
+      if [[ _errorCounter -gt 1 ]]; then
+        echoerr "Error: An unknown response code has repeatedly been received. $_response"
+        return 1
+      else
+        return 0
+      fi
+    ;;
+  esac
+}
+
+# requires parameter
+# 1. param: 4 or 6 for IP version
+function ipHasChanged() {
+  if [[ ${1} == 4 ]]; then
+    remote_ip=$(getRemoteIP 4 $_ipv4_checker)
+    #TODO: this is doublicated code, refactor this some time
+    if [[ $? -gt 0 ]]; then
+      echoerr "IPCheck (getRemoteIP) request failed $remote_ip"
+      return 0
+    fi
+    if [[ $DYNB_UPDATE_METHOD == domrobot ]]; then
+      dns_ip=$(getDNSIP A)
+    else
+      dig_response=$(dig @${_DNS_checkServer} in a +short "$DYNB_DYN_DOMAIN")
+      #TODO: this is doublicated code, refactor this some time
+      if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]; then
+        echoerr "DNS request failed $dig_response"
+        return 0
+      fi
+      dns_ip=$dig_response
+    fi
+  fi
+  if [[ ${1} == 6 ]]; then
+    remote_ip=$(getRemoteIP 6 $_ipv6_checker)
+    #TODO: this is doublicated code, refactor this some time
+    if [[ $? -gt 0 ]]; then
+      echoerr "IPCheck (getRemoteIP) request failed $remote_ip"
+      return 0
+    fi
+    if [[ $DYNB_UPDATE_METHOD == domrobot ]]; then
+      dns_ip=$(getDNSIP AAAA)
+    else
+      dig_response=$(dig @${_DNS_checkServer} in aaaa +short "$DYNB_DYN_DOMAIN")
+      #TODO: this is doublicated code, refactor this some time
+      if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]; then
+        echoerr "DNS request failed $dig_response"
+        return 0
+      fi
+      dns_ip=$dig_response
+    fi
+  fi
+
+  if [[ ${1} == 4 ]]; then
+    _new_IPv4=$remote_ip
+    debugMessage "New IPv4: $_new_IPv4 old was: $dns_ip"
+  else
+    _new_IPv6=$remote_ip
+    debugMessage "New IPv6: $_new_IPv6 old was: $dns_ip"
+  fi
+
+  if [[ "$remote_ip" == "$dns_ip" ]]; then
+    return 0
+  else
+    return 1
+  fi
+}
+
+################
+## parameters ##
+################
+
+function handleParameters() {
+  if [[ $_arg_version == "on" ]]; then
+    echo $_version
+    exit 0
+  fi
+  if [[ $_arg_link == "on" ]]; then
+    ln --verbose --symbolic "$(realpath "$0")" "$HOME/.local/bin/dynb"
+    exit 0
+  fi
+  if [[ $_arg_reset == "on" ]]; then
+    rm --verbose "$_statusFile"
+    exit 0
+  fi
+    if [[ $_arg_debug == "on" ]]; then
+    _debug=1
+  fi
+  if [[ $_arg_update_method != "" ]]; then
+    DYNB_UPDATE_METHOD=$_arg_update_method
+  fi
+  if [[ $_arg_ip_mode != "" ]]; then
+    DYNB_IP_MODE=$_arg_ip_mode
+  fi
+  if [[ $_arg_domain != "" ]]; then
+    DYNB_DYN_DOMAIN=$_arg_domain
+  fi
+  if [[ $_arg_service_provider != "" ]]; then
+    DYNB_SERVICE_PROVIDER=$_arg_service_provider
+  fi
+  if [[ $_arg_username != "" ]]; then
+    DYNB_USERNAME=$_arg_username
+  fi
+  if [[ $_arg_password != "" ]]; then
+    DYNB_PASSWORD=$_arg_password
+  fi
+  if [[ $_arg_token != "" ]]; then
+    DYNB_TOKEN=$_arg_token
+  fi
+  if [[ $_arg_interval != "" ]]; then
+    DYNB_INTERVAL=$_arg_interval
+  fi
+
+  if [[ -z $DYNB_INTERVAL ]]; then
+    _loopMode=0
+  elif [[ $DYNB_INTERVAL -lt _minimum_looptime ]]; then
+    DYNB_INTERVAL=$_minimum_looptime
+    _loopMode=1
+  else
+    _loopMode=1
+  fi
+    if [[ $_network_interface != "" ]]; then
+    _interface_str="--interface $_network_interface"
+  fi
+
+  if [[ $DYNB_IP_MODE == d* ]]; then
+    _is_IPv4_enabled=true
+    _is_IPv6_enabled=true
+  fi
+  if [[ $DYNB_IP_MODE == *4* ]]; then
+    _is_IPv4_enabled=true
+  fi
+  if [[ $DYNB_IP_MODE == *6* ]]; then
+    _is_IPv6_enabled=true
+  fi
+
+  if [[ $DYNB_DEBUG == true ]]; then
+    _debug=1
+  fi
+  return 0
+}
+
+##################
+## dependencies ##
+##################
+
+function checkDependencies() {
+  ## If there will be more general dependencies use a loop
+  # for i in curl and some other stuff; do
+  #   if ! command -v $i >/dev/null 2>&1; then
+  #     echoerr "Error: could not find \"$i\", DynB depends on it. "
+  #     exit 1
+  #   fi
+  # done
+  [[ -x $(command -v jq 2> /dev/null) ]] || {
+    if [[ $DYNB_UPDATE_METHOD != dyndns* ]]; then
+      echo "This script depends on jq and it is not available." >&2
+      exit 1
+    fi
+  }
+}
+
+function doUnsets() {
+  unset _network_interface
+  unset _DNS_checkServer
+  unset _dns_records
+  unset DYNB_DYN_DOMAIN
+  unset _has_getopt
+  unset _help_message
+  unset _INWX_JSON_API_URL
+  unset DYNB_IP_MODE
+  unset _ipv4_checker
+  unset _ipv6_checker
+  unset _is_IPv4_enabled
+  unset _is_IPv6_enabled
+  unset _main_domain
+  unset _new_IPv4
+  unset _new_IPv6
+  unset DYNB_PASSWORD
+  unset DYNB_USERNAME
+  unset DYNB_SERVICE_PROVIDER
+  unset _version
+}
+
+function doUpdates() {
+  if [[ $DYNB_UPDATE_METHOD == "domrobot" ]]; then
+    getMainDomain
+    fetchDNSRecords
+    if [[ $_is_IPv4_enabled == true ]]; then
+      ipHasChanged 4
+      if [[ $? == 1 ]]; then
+        updateRecord 4
+      else
+        debugMessage "Skip IPv4 record update, it is already up to date"
+      fi
+    fi
+    if [[ $_is_IPv6_enabled == true ]]; then
+      ipHasChanged 6
+      if [[ $? == 1 ]]; then
+        updateRecord 6
+      else
+        debugMessage "Skip IPv6 record update, it is already up to date"
+      fi
+    fi
+  fi
+
+  if [[ $DYNB_UPDATE_METHOD == "dyndns" ]]; then
+    changed=0
+    if [[ $_is_IPv4_enabled == true ]]; then
+      ipHasChanged 4
+      (( changed += $? ))
+    fi
+    if [[ $_is_IPv6_enabled == true ]]; then
+      ipHasChanged 6
+      (( changed += $? ))
+    fi
+    if [[ $changed -gt 0 ]]; then
+      if checkStatus; then
+        debugMessage "checkStatus has no errors, try update"
+        if dynupdate; then
+          debugMessage "DynDNS2 update success"
+        else
+          debugMessage "Save new status after dynupdate has failed"
+          setStatus "$_response" "$(date +%s)" $(( _errorCounter += 1 )) "$DYNB_DYN_DOMAIN" "${DYNB_USERNAME}" "${DYNB_PASSWORD}${DYNB_TOKEN}"
+        fi
+      else
+        debugMessage "Skip DynDNS2 update, checkStatus fetched previous error."
+      fi
+    else
+      debugMessage "Skip DynDNS2 update, IPs are up to date or there is a connection problem"
+    fi
+  fi
+}
+
+#################
+## MAIN method ##
+#################
+function dynb() {
+  ## parameters and checks
+  checkDependencies
+
+  # shellcheck source=.env
+  if test -f "$_configFile"; then
+    # shellcheck disable=SC1091
+    source "$_configFile"
+  else
+    alternativeConfig="$(dirname "$(realpath "$0")")/.env"
+    if test -f "$alternativeConfig"; then
+      # shellcheck disable=SC1091
+      source "$alternativeConfig"
+    fi
+  fi
+  if test -f "$_statusFile"; then
+    debugMessage "read previous status file"
+    # shellcheck disable=SC1090
+    source "$_statusFile"
+  fi
+
+  handleParameters
+
+  ## execute operations
+
+
+  if loopMode; then
+    while :
+    do
+      doUpdates
+      sleep $DYNB_INTERVAL
+    done
+  else
+    doUpdates
+  fi
+
+  doUnsets
+  return 0
+}
+######################
+## END MAIN section ##
+######################
+
+  dynb "${@}"
+  exit $?
+
+# ] <-- needed because of Argbash

example.env

@@ -0,0 +1,21 @@
+###################
+## Configuration ##
+###################
+
+DYNB_DYN_DOMAIN=dyndns.example.com
+
+## service provider could be deSEC, duckdns, dynv6, inwx
+DYNB_SERVICE_PROVIDER=inwx
+
+## update method options: domrobot, dyndns
+DYNB_UPDATE_METHOD=domrobot
+
+## ip mode could be either: 4, 6 or dual for dualstack
+DYNB_IP_MODE=64
+
+## 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
+DYNB_USERNAME=User42
+DYNB_PASSWORD=SuperSecretPassword
+## or use a token
+DYNB_TOKEN=

man/dynb.1

@@ -0,0 +1,114 @@
+.\" Man page generated from reStructuredText.
+.
+.TH MAN 1 "2021-04-21" "" ""
+.SH NAME
+man \- DynB - dynamic DNS update script for bash
+.
+.nr rst2man-indent-level 0
+.
+.de1 rstReportMargin
+\\$1 \\n[an-margin]
+level \\n[rst2man-indent-level]
+level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
+-
+\\n[rst2man-indent0]
+\\n[rst2man-indent1]
+\\n[rst2man-indent2]
+..
+.de1 INDENT
+.\" .rstReportMargin pre:
+. RS \\$1
+. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
+. nr rst2man-indent-level +1
+.\" .rstReportMargin post:
+..
+.de UNINDENT
+. RE
+.\" indent \\n[an-margin]
+.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.nr rst2man-indent-level -1
+.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
+..
+.SH SYNOPSIS
+.sp
+\fBman  [\-\-version] [\-\-link] [\-\-reset] [\-\-debug] [\-\-update\-method UPDATE\-METHOD] [\-\-ip\-mode IP\-MODE] [\-\-domain DOMAIN] [\-\-service\-provider SERVICE\-PROVIDER] [\-\-username USERNAME] [\-\-password PASSWORD] [\-\-token TOKEN] [\-\-interval INTERVAL] [\-\-help]\fP
+.SH DESCRIPTION
+.sp
+IPv4 (A) and IPv6 (AAAA) record updates are supported.
+.SH ARGUMENTS
+.INDENT 0.0
+.TP
+.B \-v\fP,\fB  \-\-version
+outputs the client version.
+[Default: off]
+.sp
+
+.TP
+.B \-l\fP,\fB  \-\-link
+links to your script at ~/.local/bin/dynb.
+[Default: off]
+.sp
+
+.TP
+.B \-r\fP,\fB  \-\-reset
+deletes the client blocking status file.
+[Default: off]
+.sp
+
+.TP
+.B \-\-debug
+enables debug mode.
+[Default: off]
+.sp
+
+.TP
+.BI \-m \ UPDATE\-METHOD\fR,\fB \ \-\-update\-method \ UPDATE\-METHOD
+choose if you want to use DynDNS2 or the DomRobot RPC\-API.
+.sp
+dyndns | domrobot
+.TP
+.BI \-i \ IP\-MODE\fR,\fB \ \-\-ip\-mode \ IP\-MODE
+updates type A (IPv4) and AAAA (IPv6) records.
+.sp
+4 | 6 | dual
+.TP
+.BI \-d \ DOMAIN\fR,\fB \ \-\-domain \ DOMAIN
+set the domain you want to update.
+.sp
+dyndns.example.com
+.TP
+.BI \-s \ SERVICE\-PROVIDER\fR,\fB \ \-\-service\-provider \ SERVICE\-PROVIDER
+set your provider in case you are using DynDNS2.
+.sp
+deSEC | duckdns | dynv6 | inwx
+.TP
+.BI \-u \ USERNAME\fR,\fB \ \-\-username \ USERNAME
+depends on your selected update method and your provider.
+.sp
+e.g. user42
+.TP
+.BI \-p \ PASSWORD\fR,\fB \ \-\-password \ PASSWORD
+depends on your selected update method and your provider.
+.sp
+e.g. SuperSecretPassword
+.TP
+.BI \-t \ TOKEN\fR,\fB \ \-\-token \ TOKEN
+depends on your selected update method and your provider.
+.sp
+YourProviderGivenToken
+.TP
+.BI \-\-interval \ INTERVAL
+choose the seconds interval to run the script in a loop, minimum is 60.
+.sp
+
+.TP
+.B \-h\fP,\fB  \-\-help
+Prints help.
+.sp
+
+.UNINDENT
+.SH AUTHOR
+Eduard Veit
+.\" Generated by docutils manpage writer.
+.

man/man-defs.rst

@@ -0,0 +1,35 @@
+
+.. |AUTHOR| replace:: Eduard Veit
+
+.. |VERSION| replace:: \
+
+.. |MAN_SECTION| replace:: 1
+
+.. |DESCRIPTION| replace::
+   IPv4 (A) and IPv6 (AAAA) record updates are supported.
+
+.. |OPTION_VERSION| replace:: \
+
+.. |OPTION_LINK| replace:: \
+
+.. |OPTION_RESET| replace:: \
+
+.. |OPTION_DEBUG| replace:: \
+
+.. |OPTION_UPDATE_METHOD| replace:: dyndns | domrobot
+
+.. |OPTION_IP_MODE| replace:: 4 | 6 | dual
+
+.. |OPTION_DOMAIN| replace:: dyndns.example.com
+
+.. |OPTION_SERVICE_PROVIDER| replace:: deSEC | duckdns | dynv6 | inwx
+
+.. |OPTION_USERNAME| replace:: e.g. user42
+
+.. |OPTION_PASSWORD| replace:: e.g. SuperSecretPassword
+
+.. |OPTION_TOKEN| replace:: YourProviderGivenToken
+
+.. |OPTION_INTERVAL| replace:: \
+
+.. |OPTION_HELP| replace:: \

man/man.rst

@@ -0,0 +1,88 @@
+
+.. include:: man-defs.rst
+
+
+===
+man
+===
+
+-----------------------------------------
+DynB - dynamic DNS update script for bash
+-----------------------------------------
+
+:Author: |AUTHOR|
+:Date:   2021-04-21
+:Version: |VERSION|
+:Manual section: |MAN_SECTION|
+
+
+SYNOPSIS
+========
+
+``man  [--version] [--link] [--reset] [--debug] [--update-method UPDATE-METHOD] [--ip-mode IP-MODE] [--domain DOMAIN] [--service-provider SERVICE-PROVIDER] [--username USERNAME] [--password PASSWORD] [--token TOKEN] [--interval INTERVAL] [--help]``
+
+
+DESCRIPTION
+===========
+
+|DESCRIPTION|
+
+
+ARGUMENTS
+=========
+
+-v, --version                                             outputs the client version.
+                                                          [Default: off]
+
+                                                          |OPTION_VERSION|
+
+-l, --link                                                links to your script at ~/.local/bin/dynb.
+                                                          [Default: off]
+
+                                                          |OPTION_LINK|
+
+-r, --reset                                               deletes the client blocking status file.
+                                                          [Default: off]
+
+                                                          |OPTION_RESET|
+
+--debug                                                   enables debug mode.
+                                                          [Default: off]
+
+                                                          |OPTION_DEBUG|
+
+-m UPDATE-METHOD, --update-method UPDATE-METHOD           choose if you want to use DynDNS2 or the DomRobot RPC-API.
+
+                                                          |OPTION_UPDATE_METHOD|
+
+-i IP-MODE, --ip-mode IP-MODE                             updates type A (IPv4) and AAAA (IPv6) records.
+
+                                                          |OPTION_IP_MODE|
+
+-d DOMAIN, --domain DOMAIN                                set the domain you want to update.
+
+                                                          |OPTION_DOMAIN|
+
+-s SERVICE-PROVIDER, --service-provider SERVICE-PROVIDER  set your provider in case you are using DynDNS2.
+
+                                                          |OPTION_SERVICE_PROVIDER|
+
+-u USERNAME, --username USERNAME                          depends on your selected update method and your provider.
+
+                                                          |OPTION_USERNAME|
+
+-p PASSWORD, --password PASSWORD                          depends on your selected update method and your provider.
+
+                                                          |OPTION_PASSWORD|
+
+-t TOKEN, --token TOKEN                                   depends on your selected update method and your provider.
+
+                                                          |OPTION_TOKEN|
+
+--interval INTERVAL                                       choose the seconds interval to run the script in a loop, minimum is 60.
+
+                                                          |OPTION_INTERVAL|
+
+-h, --help                                                Prints help.
+
+                                                          |OPTION_HELP|