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dynb/dynb.sh
Eduard Veit cc36a3f8ae minor: 🎨 change code style
2022-01-31 14:03:51 +01:00

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#!/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 $_SERVER'REMOTE_ADDR'; ?>
_ipv4_checker=api64.ipify.org
_ipv6_checker=api64.ipify.org
## An exernal DNS check server prevents wrong info from local DNS servers/resolvers
_DNS_checkServer=
## if you are actively using multiple network interfaces you might want to specify this
## normally the default value is okay
#_network_interface=eth0
_network_interface=
######################################################
## You don't need to change the following variables ##
_INWX_JSON_API_URL=https://api.domrobot.com/jsonrpc/
_internet_connectivity_test_server=https://www.google.de
_new_IPv4=
_new_IPv6=
_dns_records=
_main_domain=
_is_IPv4_enabled=false
_is_IPv6_enabled=false
_interface_str=
_status=
_eventTime=0
_errorCounter=0
_response=
_statusHostname=
_statusUsername=
_statusPassword=
_version=0.3.0
_userAgent="DynB/$_version github.com/EV21/dynb"
_configFile=$HOME/.local/share/dynb/.env
_statusFile=/tmp/dynb.status
_debug=0
_minimum_looptime=60
_loopMode=0
# Ansi color code variables
yellow_color="\e[0;33m"
green_color="\e[0;92m"
expand_bg="\e[K"
red_color_bg="\e[0;101m${expand_bg}"
bold="\e[1m"
reset_color_modification="\e[0m"
REGEX_IPv4="^(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])$"
REGEX_IPv6="^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$"
function is_IPv4_address
{
local ip=$1
if [[ $ip =~ $REGEX_IPv4 ]]
then return 0
else return 1
fi
}
function is_IPv6_address
{
local ip=$1
if [[ $ip =~ $REGEX_IPv6 ]]
then return 0
else return 1
fi
}
function loopMode
{
if [[ $_loopMode -eq 1 ]]
then return 0
else return 1
fi
}
function debugMode
{
if [[ $_debug -eq 1 ]]
then return 0
else return 1
fi
}
function infoMessage
{
echo -e "${green_color}$(logtime) INFO: $*${reset_color_modification}"
}
function debugMessage
{
if debugMode; then
echo -e "${yellow_color}$(logtime) DEBUG: ${*}${reset_color_modification}"
fi
}
function errorMessage
{
echo -e "${red_color_bg}${bold}$(logtime) ERROR: $*${reset_color_modification}" >&2
}
function logtime
{
LOGTIME=$(date "+%Y-%m-%d %H:%M:%S")
echo "[$LOGTIME]"
}
# 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
{
local ip_version=$1
local ip_check_server=$2
if [[ -n $_DNS_checkServer ]]
then
curl --silent "$_interface_str" --user-agent "$_userAgent" \
--ipv"${ip_version}" --dns-servers "$_DNS_checkServer" --location "${ip_check_server}"
else
curl --silent "$_interface_str" --user-agent "$_userAgent" \
--ipv"${ip_version}" --location "${ip_check_server}"
fi
# shellcheck disable=2181
if [[ $? -gt 0 ]]; then
errorMessage "IPCheck (getRemoteIP ${1}) request failed"
exit 1
fi
}
# requires parameter
# 1. param: 4 or 6 as ip version
function updateRecord
{
local ip_version=$1
if [[ ${ip_version} == 4 ]]
then
ID=$(getRecordID A)
IP=$_new_IPv4
fi
if [[ ${ip_version} == 6 ]]
then
ID=$(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"
)
infoMessage "$(echo "$_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="${DUCKDNS_DYNDNS_UPDATE_URL}"
myip_str=ipv4
myipv6_str=ipv6
;;
*)
errorMessage "$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 [[ $_response == "good 127.0.0.1" ]]; then
errorMessage "$_response: Request ignored."
return 1
else
infoMessage "$_response: The DynDNS update has been executed."
_errorCounter=0
return 0
fi
;;
nochg*)
infoMessage "$_response: Nothing has changed, IP addresses are still up to date."
return 1
;;
abuse)
errorMessage "$_response: Username is blocked due to abuse."
return 1
;;
badauth | 401)
errorMessage "$_response: Invalid username password combination."
return 1
;;
badagent)
errorMessage "$_response: Client disabled. Something is very wrong!"
return 1
;;
!donator)
errorMessage "$_response: An update request was sent, including a feature that is not available to that particular user such as offline options."
return 1
;;
!yours)
errorMessage "$_response: The domain does not belong to your user account"
return 1
;;
notfqdn)
errorMessage "$_response: Hostname $DYNB_DYN_DOMAIN is invalid"
return 1
;;
nohost)
errorMessage "$_response: Hostname supplied does not exist under specified account, enter new login credentials before performing an additional request."
return 1
;;
numhost)
errorMessage "$_response: Too many hostnames have been specified for this update"
return 1
;;
dnserr)
errorMessage "$_response: There is an internal error in the dyndns update system. Retry update no sooner than 30 minutes."
return 1
;;
911 | 5*)
errorMessage "$_response: A fatal error on provider side such as a database outage. Retry update no sooner than 30 minutes."
return 1
;;
*)
if [[ "$_response" == "$_status" ]]; then
errorMessage "An unknown response code has been received. $_response"
return 1
else
errorMessage "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
errorMessage "The update client was spamming unnecessary update requests, something might be wrong with your IP-Check site."
errorMessage "Fix your config an then delete $_statusFile or restart your docker container"
return 1
fi
;;
nohost | !yours)
if [[ "$_statusHostname" == "$DYNB_DYN_DOMAIN" && ("$_statusUsername" == "$DYNB_USERNAME" || $_statusUsername == "$DYNB_TOKEN") ]]; then
errorMessage "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" == "$DYNB_PASSWORD" ]]; then
errorMessage "Invalid username password combination."
return 1
else
rm "$_statusFile"
fi
return 0
;;
badagent)
errorMessage "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)
errorMessage "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)
errorMessage "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 [[ $delta -lt 1800 ]]; then
errorMessage "$_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
errorMessage "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
{
local ip_version=$1
case ${ip_version} in
4)
remote_ip=$(getRemoteIP 4 $_ipv4_checker)
if ! is_IPv4_address "$remote_ip"
then errorMessage "The response from the IP check server is not an IPv4 address: $remote_ip"; return 0
fi
if [[ $DYNB_UPDATE_METHOD == domrobot ]]
then dns_ip=$(getDNSIP A)
else
if [[ -n $_DNS_checkServer ]]
then dig_response=$(dig @"${_DNS_checkServer}" in a +short "$DYNB_DYN_DOMAIN")
else dig_response=$(dig in a +short "$DYNB_DYN_DOMAIN")
fi
if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]
then errorMessage "DNS request failed $dig_response"; return 0
fi
# If the dns resolver lists multiple records in the answer section we filter the first line
# using short option "-n" and not "--lines" because of alpines limited BusyBox head command
dns_ip=$(echo "$dig_response" | head -n 1)
fi
_new_IPv4=$remote_ip
debugMessage "IPv4 from remote IP check server: $_new_IPv4, IPv4 from DNS: $dns_ip"
;;
6)
remote_ip=$(getRemoteIP 6 $_ipv6_checker)
if ! is_IPv6_address "$remote_ip"
then
errorMessage "The response from the IP check server is not an IPv6 address: $remote_ip"
return 0
fi
if [[ $DYNB_UPDATE_METHOD == domrobot ]]; then
dns_ip=$(getDNSIP AAAA)
else
if [[ -n $_DNS_checkServer ]]; then
dig_response=$(dig @"${_DNS_checkServer}" in aaaa +short "$DYNB_DYN_DOMAIN")
else
dig_response=$(dig in aaaa +short "$DYNB_DYN_DOMAIN")
fi
if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]; then
errorMessage "DNS request failed $dig_response"
return 0
fi
# If the dns server lists multiple records in the answer section we filter the first line
dns_ip=$(echo "$dig_response" | head -n 1)
fi
_new_IPv6=$remote_ip
debugMessage "IPv6 from remote IP check server: $_new_IPv6, IPv4 from DNS: $dns_ip"
;;
*) ;;
esac
if [[ "$remote_ip" == "$dns_ip" ]]
then return 0
else
case ${ip_version} in
4) infoMessage "New IPv4: $_new_IPv4 old was: $dns_ip";;
6) infoMessage "New IPv6: $_new_IPv6 old was: $dns_ip";;
esac
return 1
fi
}
################
## parameters ##
################
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
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
# 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
if [[ -n $DYNB_DNS_CHECK_SERVER ]]
then _DNS_checkServer=$DYNB_DNS_CHECK_SERVER
fi
return 0
}
##################
## dependencies ##
##################
function checkDependencies
{
failCounter=0
for i in curl dig; do
if ! command -v $i >/dev/null 2>&1; then
errorMessage "could not find \"$i\", DynB depends on it. "
((failCounter++))
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
((failCounter++))
fi
}
if [[ failCounter -gt 0 ]]; then
exit 1
fi
}
function doUnsets
{
unset _network_interface
unset _DNS_checkServer
unset _dns_records
unset _has_getopt
unset _help_message
unset _INWX_JSON_API_URL
unset _ipv4_checker
unset _ipv6_checker
unset _is_IPv4_enabled
unset _is_IPv6_enabled
unset _main_domain
unset _new_IPv4
unset _new_IPv6
unset _version
unset DYNB_DYN_DOMAIN
unset DYNB_USERNAME
unset DYNB_PASSWORD
unset DYNB_TOKEN
unset DYNB_SERVICE_PROVIDER
unset DYNB_IP_MODE
unset DYNB_INTERVAL
unset DYNB_IPv4_CHECK_SITE
unset DYNB_IPv6_CHECK_SITE
unset DYNB_DNS_CHECK_SERVER
unset DYNB_DEBUG
}
function doDomrobotUpdates
{
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
}
function doDynDNS2Updates
{
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
}
function doUpdates
{
if [[ $DYNB_UPDATE_METHOD == "domrobot" ]]
then doDomrobotUpdates
fi
if [[ $DYNB_UPDATE_METHOD == "dyndns" ]]
then doDynDNS2Updates
fi
}
function ipv6_is_not_working
{
curl --ipv6 --head --silent --max-time 1 $_internet_connectivity_test_server > /dev/null
status_code=$?
if [[ $status_code -gt 0 ]]
then return 0
else return 1
fi
}
function ipv4_is_not_working
{
curl --ipv4 --head --silent --max-time 1 $_internet_connectivity_test_server > /dev/null
status_code=$?
if [[ $status_code -gt 0 ]]
then return 0
else return 1
fi
}
function check_internet_connection
{
if [[ $_is_IPv4_enabled == true ]]
then
if ipv4_is_not_working
then
_is_IPv4_enabled="false"
errorMessage "Your IPv4 internet connection does not work."
fi
fi
if [[ $_is_IPv6_enabled == true ]]
then
if ipv6_is_not_working
then
_is_IPv6_enabled="false"
errorMessage "Your IPv6 internet connection does not work."
fi
fi
}
function main
{
# shellcheck disable=SC1091,SC1090
source "$(dirname "$(realpath "$0")")/dynb-parsing.sh"
# shellcheck source=.env
if test -f "$_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
## parameters and checks
handleParameters
checkDependencies
check_internet_connection
if loopMode
then
while :
do
doUpdates
sleep $DYNB_INTERVAL
done
else doUpdates
fi
doUnsets
return 0
}
main "${@}"
exit $?
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