feat: ✨ add tzdata to Dockerfile for timezone config

You can now set your timezone with the environment variable
`TZ="Europe/Berlin"`

.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

@@ -82,24 +82,34 @@ ignore_regexps = [
 ## whenever you are tweaking this variable.
 ##
 section_regexps = [
-    ('New', [
-        r'^:sparkles\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+    ('Features', [
+        r'^[fF]eat\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
      ]),
-    ('Changes', [
-        r'^:wrench\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+    ('Added', [
+        r'^[aA]dd\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+     ]),
+    ('Changed', [
+        r'^[cC]hange\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+     ]),
+    ('Deprecated', [
+        r'^[dD]epricated\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+     ]),
+    ('Removed', [
+        r'^[rR]emove\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
      ]),
     ('Fix', [
-        r'^:bug\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+        r'^[fF]ix\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+     ]),
+    ('Security', [
+        r'^[sS]ec\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
      ]),
     ('Documentation', [
-        r'^:memo\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
-     ]),     
-    ('Remove', [
-        r'^:fire\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
+        r'^[dD]oc\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n]*)$',
      ]),
 
-    ('Other', None ## Match all lines
-     ),
+
+    #('Other', None ## Match all lines
+    # ),
 
 ]
 
@@ -148,7 +158,7 @@ body_process = ReSub(r'((^|\n)[A-Z]\w+(-\w+)*: .*(\n\s+.*)*)+$', r'') | strip
 ##
 ## Available constructs are those listed in ``body_process`` doc.
 subject_process = (strip |
-    ReSub(r'^([cC]hg|[fF]ix|[nN]ew)\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n@]*)(@[a-z]+\s+)*$', r'\4') |
+    ReSub(r'^([cC]hg|[fF]ix|[nN]ew|[dD]oc|[fF]eat|[aA]dd|[cC]hange)\s*:\s*((dev|use?r|pkg|test|doc)\s*:\s*)?([^\n@]*)(@[a-z]+\s+)*$', r'\4') |
     SetIfEmpty("No commit message.") | ucfirst | final_dot)
 
 

.github/workflows/shellcheck.yml

@@ -0,0 +1,16 @@
+name: Run shellcheck with reviewdog
+on: [pull_request]
+jobs:
+  shellcheck:
+    name: runner / shellcheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: shellcheck
+        uses: reviewdog/action-shellcheck@v1.9.0
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          reporter: github-pr-review
+          path: "."
+          pattern: "*.sh"
+          exclude: "./.git/*"

.gitignore

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

.pre-commit-config.yaml

@@ -0,0 +1,17 @@
+repos:
+  - repo: https://github.com/syntaqx/git-hooks
+    rev: v0.0.17
+    hooks:
+    - id: shellcheck
+    - id: shfmt
+      args: 
+        - "-l" # list files whose formatting differs from shfmt's
+        - "-i 2" # indent: 0 for tabs (default), >0 for number of spaces
+        - "-ci" # switch cases will be indented
+        - "-w" # write result to file instead of stdout
+  - repo: https://github.com/executablebooks/mdformat
+    rev: 0.7.9
+    hooks:
+    - id: mdformat
+      additional_dependencies:
+      - mdformat-gfm # GitHub Flavored Markdown support

CHANGELOG.md

@@ -1,36 +1,114 @@
 # Changelog
 
 
-## (unreleased)
+## 0.3.0 (2022-05-26)
 
-### New
+### Features
 
-* :sparkles: add interpretaton of status codes and act accordingly. [Eduard Veit]
+* ✨ validate ip address respons from ip check web service. [Eduard Veit]
 
-* :sparkles: make network interface configurable. [Eduard Veit]
+* ✨ check internet connection for selected ip versions. [Eduard Veit]
 
-* :sparkles: add DynDNS2 support for dynv6.com. [Eduard Veit]
-
-* :sparkles: add .gitchangelog.rc. [Eduard Veit]
-
-* :sparkles: add dynb. [Eduard Veit]
+* 🎨 colorful info, debug and error messages. [Eduard Veit]
 
 ### Fix
 
-* :bug: fix sourcing of config file. [Eduard Veit]
-
-  :recycle: do some shellcheck fixes
+* Abort on all dig errors. [Eduard Veit]
 
 ### Documentation
 
-* :memo: add CHANGELOG.md. [Eduard Veit]
-
-* :memo: add .env.example. [Eduard Veit]
-
-* :memo: write README.md. [Eduard Veit]
-
-### Other
-
-* Initial commit. [EV21]
+* 📝 add labels to Dockerfile. [Eduard Veit]
+
+
+## 0.2.0 (2021-09-24)
+
+### Features
+
+* ✨ enable parameter extensions for `docker run --interactive` [Eduard Veit]
+
+### Changed
+
+* Handle dns server selection. [Eduard Veit]
+
+### Documentation
+
+* 📝 update CHANGELOG.md. [Eduard Veit]
+
+* 📝 document docker parameters. [Eduard Veit]
+
+* 📝 change default dns server setting. [Eduard Veit]
+
+* 📝 update CHANGELOG. [Eduard Veit]
+
+* 📝 update README.md. [Eduard Veit]
+
+
+## 0.1.2 (2021-04-23)
+
+### Documentation
+
+* 📝 document environment variables. [Eduard Veit]
+
+
+## 0.1.1 (2021-04-23)
+
+### Fix
+
+* 🐛 fix loop and error handling in case of connection issues. [Eduard Veit]
+
+
+## 0.1.0 (2021-04-22)
+
+### Features
+
+* ✨ add Dockerfile. [Eduard Veit]
+
+* ✨ add loop mode. [Eduard Veit]
+
+* ✨ add support for Duck DNS as DynDNS2 provider. [Eduard Veit]
+
+* ✨ add support for deSEC as DynDNS2 provider. [Eduard Veit]
+
+* ✨ add completion. [Eduard Veit]
+
+  ✨ add man page
+
+* 🔃 replace getopt with argbash. [Eduard Veit]
+
+* ✨ add interpretaton of status codes and act accordingly. [Eduard Veit]
+
+* ✨ make network interface configurable. [Eduard Veit]
+
+* ✨ add DynDNS2 support for dynv6.com. [Eduard Veit]
+
+### Added
+
+* 📝 README.md. [Eduard Veit]
+
+* ✨ dynb.sh. [Eduard Veit]
+
+### Changed
+
+* 🔃 rename environment variables. [Eduard Veit]
+
+### Fix
+
+* 🐛 fix error handling. [Eduard Veit]
+
+* 🐛 fix sourcing of config file. [Eduard Veit]
+
+  ♻️ do some shellcheck fixes
+
+### Documentation
+
+* 📝 document example of an docker-compose.yml file. [Eduard Veit]
+
+* 📝 document `loop mode` and mention `dig` as requirement. [Eduard Veit]
+
+* 📝 update example of .env in README.md. [Eduard Veit]
+
+* 📝 CHANGELOG.md. [Eduard Veit]
+
+* 📝 add example.env. [Eduard Veit]
 
 

Dockerfile

@@ -0,0 +1,21 @@
+FROM alpine:latest
+
+RUN \
+apk update \
+&& \
+apk add \
+bash \
+curl \
+jq \
+bind-tools \
+tzdata
+
+WORKDIR /usr/src/app
+
+COPY . .
+
+ENTRYPOINT ["/bin/bash", "/usr/src/app/dynb.sh"]
+
+LABEL org.opencontainers.image.source="https://github.com/EV21/dynb"
+LABEL org.opencontainers.image.description="DynB - dynamic DNS update client."
+LABEL org.opencontainers.image.licenses="MIT"

README.md

@@ -1,110 +1,184 @@
 # 🔃 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)
+  - [APIs](#apis)
+  - [DynDNS2](#dyndns2)
 - [📦 Requirements](#-requirements)
 - [🚀 Installation](#-installation)
 - [⚙ Configuration](#-configuration)
 - [🏃 Run](#-run)
 - [⏰ Cron](#-cron)
+  - [loop mode](#loop-mode)
+  - [crontab](#crontab)
+- [🐟 docker](#-docker)
+- [environment variables](#environment-variables)
+
 <!-- /TOC -->
 
 ## ✨ Update Methods
+
 The following update methods are currently implemented:
 
 ### APIs
 
-* INWX.com JSON-RPC-API  
+- INWX.com Domrobot JSON-RPC-API\
   Limitations:
   - minimum TTL is 300 (5 minutes)
 
 ### DynDNS2
 
-* INWX.com  
-* dynv6.com
+- INWX.com
+- deSEC.io (dedyn.io)
+- DuckDNS.org
+- dynv6.com
 
 ## 📦 Requirements
 
-* `curl` - The minimum requirement for running DynDNS2 operations
+- `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)
 
-essential for APIs:
+also essential if you are using other APIs:
 
-* `jq` - Command-line JSON processor
-
-optional requirement:
-
-* `getopt` for CLI parameter handling from [util-linux](https://pkgs.org/download/util-linux)
+- `jq` - Command-line JSON processor
 
 ## 🚀 Installation
 
 Download the latest release
 
 or simply clone this repo
-```
+
+```shell
 git clone https://github.com/EV21/dynb.git
 ```
 
 If you want to add the script to you PATH, run :point_down:
-```
+
+```shell
 bash dynb.sh --link
 ```
-This convenience function only works if `util-linux` is installed on your system.
 
 ## ⚙ Configuration
 
 You can use a config in form of an `.env` file.
-Or if your system meets the relevant requirements you can use CLI parameters.
+Or you can just use CLI parameters.
 
 Create `.env` in the app root directory or at `~/.local/share/dynb/.env`.
-```
-_dyn_domain=dyndns.example.com
 
-## service provider could be inwx
-_serviceProvider=inwx
+```bash
+DYNB_DYN_DOMAIN=dyndns.example.com
+
+## service provider could be deSEC, duckdns, dynv6, inwx
+DYNB_SERVICE_PROVIDER=inwx
 
 ## update method options: domrobot, dyndns
-_update_method=domrobot
+DYNB_UPDATE_METHOD=domrobot
 
 ## ip mode could be either: 4, 6 or dual for dualstack
-_ip_mode=dual
+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
-_username=
-_password=
+DYNB_USERNAME=User42
+DYNB_PASSWORD=SuperSecretPassword
+## or use a token
+DYNB_TOKEN=
 ```
 
 ## 🏃 Run
 
 If you have a config file just run :point_down:
-```
+
+```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.  
+
+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:
-```
+
+```bash
 dynb --help
 ```
-```
+
+```bash
 dynb --ip-mode dualstack --update-method domrobot --domain dyndns.example.com --username user42 --password SuperSecretPassword
 ```
-```
+
+```bash
 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 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:
-```
+
+```bash
 crontab -e
 ```
+
 then enter :point_down: to run dynb every five minutes.
-```
+
+```bash
 */5 * * * * $HOME/.local/bin/dynb >> $HOME/.local/share/dynb/dynb-cron.log
 ```
+
+alternative with docker and parameters::
+
+```bash
+*/5 * * * * docker run --interactive --tty --rm --network host ev21/dynb:latest --ip-mode 64 --update-method domrobot --domain dyndns.example.com --username user42 --password SuperSecretPassword
+```
+
 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. Note: [IPv6 networking](https://docs.docker.com/config/daemon/ipv6/) is only supported on Docker daemons running on Linux hosts.
+
+```yaml
+version: '3.4'
+
+services:
+  dynb:
+    image: ev21/dynb
+    container_name: dynb
+    network_mode: host
+    environment:
+      - DYNB_DYN_DOMAIN=dyndns.example.com
+      - DYNB_SERVICE_PROVIDER=desec
+      - DYNB_UPDATE_METHOD=dyndns
+      - DYNB_IP_MODE=64
+      - DYNB_USERNAME=User42
+      - DYNB_PASSWORD=SuperSecretPassword
+      - DYNB_INTERVAL=60
+      - TZ=Europe/Berlin
+```
+
+## environment variables
+
+| variable              | default value   | description                                                                                                    |
+| --------------------- | --------------- | -------------------------------------------------------------------------------------------------------------- |
+| DYNB_DYN_DOMAIN       | undefined       | required; `dyndns.example.com`                                                                                 |
+| DYNB_SERVICE_PROVIDER | undefined       | required; `deSEC`, `duckdns`, `dynv6`, `inwx`                                                                  |
+| 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_PASSWORD         | undefined       | the requirement depends on your provider and the update method                                                 |
+| DYNB_TOKEN            | undefined       | the requirement depends on your provider and the update method                                                 |
+| DYNB_INTERVAL         | undefined       | without this setting the script/docker container will run one time and exits                                   |
+| DYNB_DEBUG            | undefined       | more console outputs                                                                                           |
+| DYNB_IPv4_CHECK_SITE  | api64.ipify.org | You need a website or Web-API that outputs your remote IP                                                      |
+| DYNB_IPv6_CHECK_SITE  | api64.ipify.org | You need a website or Web-API that outputs your remote IP                                                      |
+| DYNB_DNS_CHECK_SERVER | undefined       | If you are using a local DNS Resolver/Server make sure it answers with the public answer or set another server |

_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-parsing-template.m4

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# m4_ignore(
+echo "This is just a script template for argbash, not the script." >&2
+exit 11  #)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
+
+# ] <-- needed because of Argbash

dynb-parsing.sh

@@ -0,0 +1,297 @@
+#!/bin/bash
+
+# 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
+
+
+# # When called, the process ends.
+# Args:
+# 	$1: The exit message (print to stderr)
+# 	$2: The exit code (default is 1)
+# if env var _PRINT_HELP is set to 'yes', the usage is print to stderr (prior to $1)
+# Example:
+# 	test -f "$_arg_infile" || _PRINT_HELP=yes die "Can't continue, have to supply file as an argument, got '$_arg_infile'" 4
+die()
+{
+	local _ret="${2:-1}"
+	test "${_PRINT_HELP:-no}" = yes && print_help >&2
+	echo "$1" >&2
+	exit "${_ret}"
+}
+
+
+# Function that evaluates whether a value passed to it begins by a character
+# that is a short option of an argument the script knows about.
+# This is required in order to support getopts-like short options grouping.
+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=
+
+
+# Function that prints general usage of the script.
+# This is useful if users asks for it, or if there is an argument parsing error (unexpected / spurious arguments)
+# and it makes sense to remind the user how the script is supposed to be called.
+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"
+}
+
+
+# The parsing of the command-line
+parse_commandline()
+{
+	while test $# -gt 0
+	do
+		_key="$1"
+		case "$_key" in
+			# The version argurment doesn't accept a value,
+			# we expect the --version or -v, so we watch for them.
+			-v|--no-version|--version)
+				_arg_version="on"
+				test "${1:0:5}" = "--no-" && _arg_version="off"
+				;;
+			# We support getopts-style short arguments clustering,
+			# so as -v doesn't accept value, other short options may be appended to it, so we watch for -v*.
+			# After stripping the leading -v from the argument, we have to make sure
+			# that the first character that follows coresponds to a short option.
+			-v*)
+				_arg_version="on"
+				_next="${_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
+				;;
+			# See the comment of option '--version' to see what's going on here - principle is the same.
+			-l|--no-link|--link)
+				_arg_link="on"
+				test "${1:0:5}" = "--no-" && _arg_link="off"
+				;;
+			# See the comment of option '-v' to see what's going on here - principle is the same.
+			-l*)
+				_arg_link="on"
+				_next="${_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
+				;;
+			# See the comment of option '--version' to see what's going on here - principle is the same.
+			-r|--no-reset|--reset)
+				_arg_reset="on"
+				test "${1:0:5}" = "--no-" && _arg_reset="off"
+				;;
+			# See the comment of option '-v' to see what's going on here - principle is the same.
+			-r*)
+				_arg_reset="on"
+				_next="${_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
+				;;
+			# See the comment of option '--version' to see what's going on here - principle is the same.
+			--no-debug|--debug)
+				_arg_debug="on"
+				test "${1:0:5}" = "--no-" && _arg_debug="off"
+				;;
+			# We support whitespace as a delimiter between option argument and its value.
+			# Therefore, we expect the --update-method or -m value.
+			# so we watch for --update-method and -m.
+			# Since we know that we got the long or short option,
+			# we just reach out for the next argument to get the value.
+			-m|--update-method)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_update_method="$2"
+				shift
+				;;
+			# We support the = as a delimiter between option argument and its value.
+			# Therefore, we expect --update-method=value, so we watch for --update-method=*
+			# For whatever we get, we strip '--update-method=' using the ${var##--update-method=} notation
+			# to get the argument value
+			--update-method=*)
+				_arg_update_method="${_key##--update-method=}"
+				;;
+			# We support getopts-style short arguments grouping,
+			# so as -m accepts value, we allow it to be appended to it, so we watch for -m*
+			# and we strip the leading -m from the argument string using the ${var##-m} notation.
+			-m*)
+				_arg_update_method="${_key##-m}"
+				;;
+			# See the comment of option '--update-method' to see what's going on here - principle is the same.
+			-i|--ip-mode)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_ip_mode="$2"
+				shift
+				;;
+			# See the comment of option '--update-method=' to see what's going on here - principle is the same.
+			--ip-mode=*)
+				_arg_ip_mode="${_key##--ip-mode=}"
+				;;
+			# See the comment of option '-m' to see what's going on here - principle is the same.
+			-i*)
+				_arg_ip_mode="${_key##-i}"
+				;;
+			# See the comment of option '--update-method' to see what's going on here - principle is the same.
+			-d|--domain)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_domain="$2"
+				shift
+				;;
+			# See the comment of option '--update-method=' to see what's going on here - principle is the same.
+			--domain=*)
+				_arg_domain="${_key##--domain=}"
+				;;
+			# See the comment of option '-m' to see what's going on here - principle is the same.
+			-d*)
+				_arg_domain="${_key##-d}"
+				;;
+			# See the comment of option '--update-method' to see what's going on here - principle is the same.
+			-s|--service-provider)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_service_provider="$2"
+				shift
+				;;
+			# See the comment of option '--update-method=' to see what's going on here - principle is the same.
+			--service-provider=*)
+				_arg_service_provider="${_key##--service-provider=}"
+				;;
+			# See the comment of option '-m' to see what's going on here - principle is the same.
+			-s*)
+				_arg_service_provider="${_key##-s}"
+				;;
+			# See the comment of option '--update-method' to see what's going on here - principle is the same.
+			-u|--username)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_username="$2"
+				shift
+				;;
+			# See the comment of option '--update-method=' to see what's going on here - principle is the same.
+			--username=*)
+				_arg_username="${_key##--username=}"
+				;;
+			# See the comment of option '-m' to see what's going on here - principle is the same.
+			-u*)
+				_arg_username="${_key##-u}"
+				;;
+			# See the comment of option '--update-method' to see what's going on here - principle is the same.
+			-p|--password)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_password="$2"
+				shift
+				;;
+			# See the comment of option '--update-method=' to see what's going on here - principle is the same.
+			--password=*)
+				_arg_password="${_key##--password=}"
+				;;
+			# See the comment of option '-m' to see what's going on here - principle is the same.
+			-p*)
+				_arg_password="${_key##-p}"
+				;;
+			# See the comment of option '--update-method' to see what's going on here - principle is the same.
+			-t|--token)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_token="$2"
+				shift
+				;;
+			# See the comment of option '--update-method=' to see what's going on here - principle is the same.
+			--token=*)
+				_arg_token="${_key##--token=}"
+				;;
+			# See the comment of option '-m' to see what's going on here - principle is the same.
+			-t*)
+				_arg_token="${_key##-t}"
+				;;
+			# See the comment of option '--update-method' to see what's going on here - principle is the same.
+			--interval)
+				test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+				_arg_interval="$2"
+				shift
+				;;
+			# See the comment of option '--update-method=' to see what's going on here - principle is the same.
+			--interval=*)
+				_arg_interval="${_key##--interval=}"
+				;;
+			# See the comment of option '--version' to see what's going on here - principle is the same.
+			-h|--help)
+				print_help
+				exit 0
+				;;
+			# See the comment of option '-v' to see what's going on here - principle is the same.
+			-h*)
+				print_help
+				exit 0
+				;;
+			*)
+				_PRINT_HELP=yes die "FATAL ERROR: Got an unexpected argument '$1'" 1
+				;;
+		esac
+		shift
+	done
+}
+
+# Now call all the functions defined above that are needed to get the job done
+parse_commandline "$@"
+
+# OTHER STUFF GENERATED BY Argbash
+
+### END OF CODE GENERATED BY Argbash (sortof) ### ])
+# [ <-- needed because of Argbash
+
+
+# vvv  PLACE YOUR CODE HERE  vvv
+
+# PUT YOUR CODE HERE
+
+# ^^^  TERMINATE YOUR CODE BEFORE THE BOTTOM ARGBASH MARKER  ^^^
+
+# ] <-- needed because of Argbash

example.env

@@ -1,7 +1,21 @@
-_dyn_domain=dyndns.example.com
-_serviceProvider=inwx
-_update_method=domrobot
-_ip_mode=dual
-_username=User42
-_password=SuperSecretPassword
-_token=
+###################
+## 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|