📝 change default dns server setting

.pre-commit-config.yaml

@@ -0,0 +1,11 @@
+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

CHANGELOG.md

@@ -1,6 +1,23 @@
 # Changelog
 
 
+## (unreleased)
+
+### Documentation
+
+* :memo: update README.md. [Eduard Veit]
+
+### Other
+
+* :recycle: normalizing pre-commit configuration to a top-level map. [Eduard Veit]
+
+* :recycle: refactorings. [Eduard Veit]
+
+* Feature: :sparkles: add pre-commit git hook for shellcheck. [Eduard Veit]
+
+* Refactor: :recycle: remove unused help message. [Eduard Veit]
+
+
 ## 0.1.2 (2021-04-23)
 
 ### Documentation

README.md

@@ -154,4 +154,4 @@ services:
 | 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 | 1.1.1.1         | If you are using a local DNS Resolver/Server make sure it answers with the public answer |
+| 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-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

dynb.sh

@@ -41,7 +41,7 @@ _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
+_DNS_checkServer=
 
 ## if you are actively using multiple network interfaces you might want to specify this
 ## normally the default value is okay
@@ -73,262 +73,6 @@ _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
@@ -364,13 +108,15 @@ function logtime() {
 
 # The main domain as an identifier for the dns zone is required for the updateRecord call
 function getMainDomain() {
-  request=$( echo "{}" | \
+  request=$(
-      jq '(.method="nameserver.list")' | \
+    echo "{}" |
-      jq "(.params.user=\"$DYNB_USERNAME\")" | \
+      jq '(.method="nameserver.list")' |
+      jq "(.params.user=\"$DYNB_USERNAME\")" |
       jq "(.params.pass=\"$DYNB_PASSWORD\")"
   )
 
-  _response=$(curl --silent  \
+  _response=$(
+    curl --silent \
       "$_interface_str" \
       --user-agent "$_userAgent" \
       --header "Content-Type: application/json" \
@@ -381,15 +127,17 @@ function getMainDomain() {
 }
 
 function fetchDNSRecords() {
-  request=$( echo "{}" | \
+  request=$(
-      jq '(.method="'nameserver.info'")' | \
+    echo "{}" |
-      jq "(.params.user=\"$DYNB_USERNAME\")" | \
+      jq '(.method="'nameserver.info'")' |
-      jq "(.params.pass=\"$DYNB_PASSWORD\")" | \
+      jq "(.params.user=\"$DYNB_USERNAME\")" |
-      jq "(.params.domain=\"$_main_domain\")" | \
+      jq "(.params.pass=\"$DYNB_PASSWORD\")" |
+      jq "(.params.domain=\"$_main_domain\")" |
       jq "(.params.name=\"$DYNB_DYN_DOMAIN\")"
   )
 
-  _response=$( curl --silent  \
+  _response=$(
+    curl --silent \
       "$_interface_str" \
       --user-agent "$_userAgent" \
       --header "Content-Type: application/json" \
@@ -417,8 +165,18 @@ function getDNSIP() {
 # 2. param: IP check server address
 # result to stdout
 function getRemoteIP() {
+  if [[ -n $_DNS_checkServer ]]; then
     curl --silent "$_interface_str" --user-agent "$_userAgent" \
-    --ipv"${1}" --dns-servers 1.1.1.1 --location "${2}"
+      --ipv"${1}" --dns-servers "$_DNS_checkServer" --location "${2}"
+  else
+    curl --silent "$_interface_str" --user-agent "$_userAgent" \
+      --ipv"${1}" --location "${2}"
+  fi
+  # shellcheck disable=2181
+  if [[ $? -gt 0 ]]; then
+    errorMessage "IPCheck (getRemoteIP ${1}) request failed"
+    exit 1
+  fi
 }
 
 # requires parameter
@@ -433,16 +191,18 @@ function updateRecord() {
     IP=$_new_IPv6
   fi
   if [[ $IP != "" ]]; then
-  request=$( echo "{}" | \
+    request=$(
-      jq '(.method="nameserver.updateRecord")' | \
+      echo "{}" |
-      jq "(.params.user=\"$DYNB_USERNAME\")" | \
+        jq '(.method="nameserver.updateRecord")' |
-      jq "(.params.pass=\"$DYNB_PASSWORD\")" | \
+        jq "(.params.user=\"$DYNB_USERNAME\")" |
-      jq "(.params.id=\"$ID\")" | \
+        jq "(.params.pass=\"$DYNB_PASSWORD\")" |
-      jq "(.params.content=\"$IP\")" | \
+        jq "(.params.id=\"$ID\")" |
+        jq "(.params.content=\"$IP\")" |
         jq "(.params.ttl=\"$TTL\")"
     )
 
-  _response=$(curl --silent  \
+    _response=$(
+      curl --silent \
         "$_interface_str" \
         --user-agent "$_userAgent" \
         --header "Content-Type: application/json" \
@@ -515,7 +275,8 @@ function dynupdate() {
         "${dyndns_update_url}")
       ;;
     dynv6* | duckDNS* | duckdns*)
-      _response=$(curl --silent "$_interface_str" \
+      _response=$(
+        curl --silent "$_interface_str" \
           --user-agent "$_userAgent" \
           "${dyndns_update_url}"
       )
@@ -663,52 +424,48 @@ function checkStatus() {
 # requires parameter
 # 1. param: 4 or 6 for IP version
 function ipHasChanged() {
-  if [[ ${1} == 4 ]]; then
+  case ${1} in
+    4)
       remote_ip=$(getRemoteIP 4 $_ipv4_checker)
-    #TODO: this is duplicated code, refactor this.
-    if [[ $? -gt 0 ]]; then
-      errorMessage "IPCheck (getRemoteIP 4) 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")
+        if [[ -n $_DNS_checkServer ]]; then
-      #TODO: this is duplicated code, refactor this.
+          dig_response=$(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 $dig_response"
           return 0
         fi
         dns_ip=$dig_response
       fi
-  fi
+      _new_IPv4=$remote_ip
-  if [[ ${1} == 6 ]]; then
+      debugMessage "New IPv4: $_new_IPv4 old was: $dns_ip"
+      ;;
+    6)
       remote_ip=$(getRemoteIP 6 $_ipv6_checker)
-    #TODO: this is duplicated code, refactor this.
-    if [[ $? -gt 0 ]]; then
-      errorMessage "IPCheck (getRemoteIP 6) 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")
+        if [[ -n $_DNS_checkServer ]]; then
-      #TODO: this is duplicated code, refactor this.
+          dig_response=$(dig @"${_DNS_checkServer}" in aaaa +short "$DYNB_DYN_DOMAIN")
+        else
+          dig_response=$(dig in aaaa +short "$DYNB_DYN_DOMAIN")
+        fi
         if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]; then
           errorMessage "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
+      ;;
+    *) ;;
+
+  esac
 
   if [[ "$remote_ip" == "$dns_ip" ]]; then
     return 0
@@ -722,42 +479,54 @@ function ipHasChanged() {
 ################
 
 function handleParameters() {
+  # shellcheck disable=SC2154
   if [[ $_arg_version == "on" ]]; then
     echo $_version
     exit 0
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_link == "on" ]]; then
     ln --verbose --symbolic "$(realpath "$0")" "$HOME/.local/bin/dynb"
     exit 0
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_reset == "on" ]]; then
     rm --verbose "$_statusFile"
     exit 0
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_debug == "on" ]]; then
     _debug=1
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_update_method != "" ]]; then
     DYNB_UPDATE_METHOD=$_arg_update_method
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_ip_mode != "" ]]; then
     DYNB_IP_MODE=$_arg_ip_mode
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_domain != "" ]]; then
     DYNB_DYN_DOMAIN=$_arg_domain
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_service_provider != "" ]]; then
     DYNB_SERVICE_PROVIDER=$_arg_service_provider
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_username != "" ]]; then
     DYNB_USERNAME=$_arg_username
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_password != "" ]]; then
     DYNB_PASSWORD=$_arg_password
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_token != "" ]]; then
     DYNB_TOKEN=$_arg_token
   fi
+  # shellcheck disable=SC2154
   if [[ $_arg_interval != "" ]]; then
     DYNB_INTERVAL=$_arg_interval
   fi
@@ -788,9 +557,11 @@ function handleParameters() {
   if [[ $DYNB_DEBUG == true ]]; then
     _debug=1
   fi
+  # shellcheck disable=SC2154
   if [[ -n $DYNB_IPv4_CHECK_SITE ]]; then
     _ipv4_checker=$DYNB_IPv4_CHECK_SITE
   fi
+  # shellcheck disable=SC2154
   if [[ -n $DYNB_IPv6_CHECK_SITE ]]; then
     _ipv6_checker=$DYNB_IPv6_CHECK_SITE
   fi
@@ -913,8 +684,8 @@ function doUpdates() {
 ## MAIN method ##
 #################
 function dynb() {
-  ## parameters and checks
+  # shellcheck disable=SC1091,SC1090
-  checkDependencies
+  source "$(dirname "$(realpath "$0")")/dynb-parsing.sh"
 
   # shellcheck source=.env
   if test -f "$_configFile"; then
@@ -933,11 +704,12 @@ function dynb() {
     source "$_statusFile"
   fi
 
+  ## parameters and checks
   handleParameters
+  checkDependencies
 
   if loopMode; then
-    while :
+    while :; do
-    do
       doUpdates
       sleep $DYNB_INTERVAL
     done