doc: 📝 document environment variables

CHANGELOG.md

@@ -1,6 +1,24 @@
 # Changelog
 
 
+## 0.1.2 (2021-04-23)
+
+### Documentation
+
+* :memo: document environment variables. [Eduard Veit]
+
+### Other
+
+* :recycle: refactor: method extractions and other beautifications. [Eduard Veit]
+
+
+## 0.1.1 (2021-04-23)
+
+### Fix
+
+* :bug: fix loop and error handling in case of connection issues. [Eduard Veit]
+
+
 ## 0.1.0 (2021-04-22)
 
 ### New

README.md

@@ -11,7 +11,7 @@ IPv4 (A) and IPv6 (AAAA) record updates are supported.
 - [⚙ Configuration](#-configuration)
 - [🏃 Run](#-run)
 - [⏰ Cron](#-cron)
-- [⏰ docker](#-docker)
+- [🐟 docker](#-docker)
 <!-- /TOC -->
 
 ## ✨ Update Methods
@@ -140,3 +140,18 @@ services:
       - DYNB_PASSWORD=SuperSecretPassword
       - DYNB_INTERVAL=60
 ```
+## environment variables
+| variable              | default value   | description |
+| --------------------- | --------------- | ----------- |
+| DYNB_DYN_DOMAIN       | undefined       | required |
+| DYNB_SERVICE_PROVIDER | undefined       | required |
+| DYNB_UPDATE_METHOD    | undefined       | required |
+| DYNB_IP_MODE          | undefined       | required |
+| 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 | 1.1.1.1         | If you are using a local DNS Resolver/Server make sure it answers with the public answer |

dynb.sh

@@ -65,7 +65,7 @@ _response=
 _statusHostname=
 _statusUsername=
 _statusPassword=
-_version=0.1.0
+_version=0.1.2
 _userAgent="DynB/$_version github.com/EV21/dynb"
 _configFile=$HOME/.local/share/dynb/.env
 _statusFile=/tmp/dynb.status
@@ -345,13 +345,22 @@ function debugMode() {
   fi
 }
 
+function infoMessage() {
+  echo "$(logtime) INFO: $*"
+}
+
 function debugMessage() {
   if debugMode; then
-    echo "Debug: $*"
+    echo "$(logtime) DEBUG: $*"
   fi
 }
 
-function echoerr() { printf "%s\n" "$*" >&2; }
+function errorMessage() { printf "$(logtime) ERROR: %s\n" "$*" >&2; }
+
+function logtime() {
+  LOGTIME=$(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() {
@@ -473,7 +482,7 @@ function dynupdate() {
       myipv6_str=ipv6
     ;;
     * )
-    echoerr "$DYNB_SERVICE_PROVIDER is not supported"
+    errorMessage "$DYNB_SERVICE_PROVIDER is not supported"
     exit 1
     ;;
   esac
@@ -516,64 +525,64 @@ function dynupdate() {
   case $_response in
     good* | OK* | "addresses updated" )
       if [[ $_response == "good 127.0.0.1" ]]; then
-        echoerr "Error: $_response: Request ignored."
+        errorMessage "$_response: Request ignored."
         return 1
       else
-        echo "$_response: The DynDNS update has been executed."
+        infoMessage "$_response: The DynDNS update has been executed."
         _errorCounter=0
         return 0
       fi
     ;;
     nochg* )
-      echo "$_response: Nothing has changed, IP addresses are still up to date."
+      infoMessage "$_response: Nothing has changed, IP addresses are still up to date."
       return 1
     ;;
     abuse )
-      echoerr "Error: $_response: Username is blocked due to abuse."
+      errorMessage "$_response: Username is blocked due to abuse."
       return 1
     ;;
     badauth | 401 )
-      echoerr "Error: $_response: Invalid username password combination."
+      errorMessage "$_response: Invalid username password combination."
       return 1
     ;;
     badagent )
-      echoerr "Error: $_response: Client disabled. Something is very wrong!"
+      errorMessage "$_response: Client disabled. Something is very wrong!"
       return 1
     ;;
     !donator )
-      echoerr "Error: $_response: An update request was sent, including a feature that is not available to that particular user such as offline options."
+      errorMessage "$_response: An update request was sent, including a feature that is not available to that particular user such as offline options."
       return 1
     ;;
     !yours )
-      echoerr "Error: $_response: The domain does not belong to your user account"
+      errorMessage "$_response: The domain does not belong to your user account"
       return 1
     ;;
     notfqdn )
-      echoerr "Error: $_response: Hostname $DYNB_DYN_DOMAIN is invalid"
+      errorMessage "$_response: Hostname $DYNB_DYN_DOMAIN is invalid"
       return 1
     ;;
     nohost )
-      echoerr "Error: $_response: Hostname supplied does not exist under specified account, enter new login credentials before performing an additional request."
+      errorMessage "$_response: Hostname supplied does not exist under specified account, enter new login credentials before performing an additional request."
       return 1
     ;;
     numhost )
-      echoerr "Error: $_response: Too many hostnames have been specified for this update"
+      errorMessage "$_response: Too many hostnames have been specified for this update"
       return 1
     ;;
     dnserr )
-      echoerr "Error: $_response: There is an internal error in the dyndns update system. Retry update no sooner than 30 minutes."
+      errorMessage "$_response: There is an internal error in the dyndns update system. Retry update no sooner than 30 minutes."
       return 1
     ;;
     911 | 5* )
-      echoerr "Error: $_response: A fatal error on provider side such as a database outage. Retry update no sooner than 30 minutes."
+      errorMessage "$_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
-        echoerr "Error: An unknown response code has been received. $_response"
+        errorMessage "An unknown response code has been received. $_response"
         return 1
       else
-        echoerr "Error: unknown respnse code: $_response"
+        errorMessage "unknown respnse code: $_response"
         return 0
       fi
     ;;
@@ -589,14 +598,14 @@ function checkStatus() {
   case $_status in
     nochg* )
       if [[ _errorCounter -gt 1 ]]; then
-        echoerr "Error: The update client was spamming unnecessary update requests, something might be wrong with your IP-Check site."
-        echoerr "Fix your config an then delete $_statusFile"
+        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
-        echoerr "Error: Hostname supplied does not exist under specified account, enter new login credentials before performing an additional request."
+        errorMessage "Hostname supplied does not exist under specified account, enter new login credentials before performing an additional request."
         return 1
       else
         rm "$_statusFile"
@@ -605,7 +614,7 @@ function checkStatus() {
     ;;
     badauth | 401 )
       if [[ "$_statusUsername" == "$DYNB_USERNAME" && "$_statusPassword" == "$DYNB_PASSWORD" ]]; then
-        echoerr "Error: Invalid username password combination."
+        errorMessage "Invalid username password combination."
         return 1
       else
         rm "$_statusFile"
@@ -613,19 +622,19 @@ function checkStatus() {
       return 0
     ;;
     badagent )
-      echoerr "Error: Client is deactivated by provider."
+      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 )
-      echoerr "Error: An update request was sent, including a feature that is not available to that particular user such as offline options."
+      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 )
-      echoerr "Error: Username is blocked due to abuse."
+      errorMessage "Username is blocked due to abuse."
       echo "Fix your config and then manually remove $_statusFile to reset the client blockade"
       echo "If it still fails file an issue at github or try another client :)"
       return 1
@@ -633,7 +642,7 @@ function checkStatus() {
     911 | 5* )
       delta=$(( $(date +%s) - _eventTime ))
       if [[ $delta -lt 1800 ]]; then
-        echoerr "$_status: The provider currently has an fatal error. DynB will wait for next update until 30 minutes have passed since last request, $(date --date=@$delta -u +%M) minutes already passed."
+        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"
@@ -642,7 +651,7 @@ function checkStatus() {
     ;;
     * )
       if [[ _errorCounter -gt 1 ]]; then
-        echoerr "Error: An unknown response code has repeatedly been received. $_response"
+        errorMessage "An unknown response code has repeatedly been received. $_response"
         return 1
       else
         return 0
@@ -656,18 +665,40 @@ function checkStatus() {
 function ipHasChanged() {
   if [[ ${1} == 4 ]]; then
     remote_ip=$(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
-      dns_ip=$(dig @${_DNS_checkServer} in a +short "$DYNB_DYN_DOMAIN")
+      dig_response=$(dig @${_DNS_checkServer} in a +short "$DYNB_DYN_DOMAIN")
+      #TODO: this is duplicated code, refactor this.
+      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 [[ ${1} == 6 ]]; then
     remote_ip=$(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
-      dns_ip=$(dig @${_DNS_checkServer} in aaaa +short "$DYNB_DYN_DOMAIN")
+      dig_response=$(dig @${_DNS_checkServer} in aaaa +short "$DYNB_DYN_DOMAIN")
+      #TODO: this is duplicated code, refactor this.
+      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
 
@@ -757,6 +788,15 @@ function handleParameters() {
   if [[ $DYNB_DEBUG == true ]]; then
     _debug=1
   fi
+  if [[ -n $DYNB_IPv4_CHECK_SITE ]]; then
+    _ipv4_checker=$DYNB_IPv4_CHECK_SITE
+  fi
+  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
 }
 
@@ -765,30 +805,31 @@ function handleParameters() {
 ##################
 
 function checkDependencies() {
-  ## If there will be more general dependencies use a loop
-  # for i in curl and some other stuff; do
-  #   if ! command -v $i >/dev/null 2>&1; then
-  #     echoerr "Error: could not find \"$i\", DynB depends on it. "
-  #     exit 1
-  #   fi
-  # done
+  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
-      exit 1
+      (( failCounter++ ))
     fi
   }
+  if [[ failCounter -gt 0 ]]; then
+    exit 1
+  fi
 }
 
 function doUnsets() {
   unset _network_interface
   unset _DNS_checkServer
   unset _dns_records
-  unset DYNB_DYN_DOMAIN
   unset _has_getopt
   unset _help_message
   unset _INWX_JSON_API_URL
-  unset DYNB_IP_MODE
   unset _ipv4_checker
   unset _ipv6_checker
   unset _is_IPv4_enabled
@@ -796,14 +837,21 @@ function doUnsets() {
   unset _main_domain
   unset _new_IPv4
   unset _new_IPv6
-  unset DYNB_PASSWORD
-  unset DYNB_USERNAME
-  unset DYNB_SERVICE_PROVIDER
   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 doUpdates() {
-  if [[ $DYNB_UPDATE_METHOD == "domrobot" ]]; then
+function doDomrobotUpdates() {
   getMainDomain
   fetchDNSRecords
   if [[ $_is_IPv4_enabled == true ]]; then
@@ -822,9 +870,9 @@ function doUpdates() {
       debugMessage "Skip IPv6 record update, it is already up to date"
     fi
   fi
-  fi
+}
 
-  if [[ $DYNB_UPDATE_METHOD == "dyndns" ]]; then
+function doDynDNS2Updates() {
   changed=0
   if [[ $_is_IPv4_enabled == true ]]; then
     ipHasChanged 4
@@ -847,8 +895,17 @@ function doUpdates() {
       debugMessage "Skip DynDNS2 update, checkStatus fetched previous error."
     fi
   else
-      debugMessage "Skip DynDNS2 update, IPs are up to date"
+    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
 }
 
@@ -878,11 +935,8 @@ function dynb() {
 
   handleParameters
 
-  ## execute operations
-
-
   if loopMode; then
-    while checkStatus
+    while :
     do
       doUpdates
       sleep $DYNB_INTERVAL