feat: ipv6 support added

dyndns.sh

@@ -1,13 +1,14 @@
 #!/bin/bash
+set -euo pipefail
 
 api_host="https://api.digitalocean.com/v2"
 sleep_interval=${SLEEP_INTERVAL:-300}
 remove_duplicates=${REMOVE_DUPLICATES:-"false"}
 
+# Only services with ipv6 supported are listed here.
 services=(
     "ifconfig.co"
-    "ipinfo.io/ip"
+    "ifconfig.io"
-    "ifconfig.me"
 )
 
 die() {
@@ -22,6 +23,68 @@ test -z $NAME && die "NAME not set!"
 
 dns_list="$api_host/domains/$DOMAIN/records"
 
+configure_record() {
+  # disable glob expansion
+  set -f
+
+  ip=$1
+  type=$2
+
+  for sub in ${NAME//;/ }; do
+    record_id=$(echo $domain_records| jq ".domain_records[] | select(.type == \"$type\" and .name == \"$sub\") | .id")
+    record_data=$(echo $domain_records| jq -r ".domain_records[] | select(.type == \"$type\" and .name == \"$sub\") | .data")
+
+    if [ $(echo "$record_id" | wc -l) -ge 2 ]; then :
+      if [[ "${remove_duplicates}" == "true" ]]; then :
+        echo "'$sub' domain name has duplicate DNS records, removing duplicates"
+        record_id_to_delete=$(echo "$record_id"| tail -n +2)
+        record_id=$(echo "$record_id"| head -1)
+        record_data=$(echo "$record_data"| head -1)
+
+        while IFS= read -r line; do
+          curl -s -X DELETE \
+            -H "Content-Type: application/json" \
+            -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
+            "$dns_list/$line" &> /dev/null
+        done <<< "$record_id_to_delete"
+      else :
+        echo "Unable to update '$sub' domain name as it has duplicate DNS records. Set REMOVE_DUPLICATES='true' to remove them."
+        continue
+      fi
+    fi
+
+  # re-enable glob expansion
+  set +f
+
+  data="{\"type\": \"A\", \"name\": \"$sub\", \"data\": \"$ip\"}"
+  url="$dns_list/$record_id"
+
+  if [[ -z $record_id ]]; then
+    echo "No record found with '$sub' domain name. Creating record, sending data=$data to url=$url"
+
+    new_record=$(curl -s -X POST \
+      -H "Content-Type: application/json" \
+      -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
+      -d "$data" \
+      "$url")
+
+    record_data=$(echo $new_record| jq -r ".data")
+  fi
+
+  if [[ "$ip" != "$record_data" ]]; then
+    echo "existing DNS record address ($record_data) doesn't match current IP ($ip), sending data=$data to url=$url"
+
+    curl -s -X PUT \
+      -H "Content-Type: application/json" \
+      -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
+      -d "$data" \
+      "$url" &> /dev/null
+    else
+      echo "existing DNS record address ($record_data) did not need updating"
+    fi
+  done
+}
+
 while ( true ); do
     domain_records=$(curl -s -X GET \
         -H "Content-Type: application/json" \
@@ -31,72 +94,26 @@ while ( true ); do
     for service in ${services[@]}; do
         echo "Trying with $service..."
 
-        ip="$(curl -s $service | grep '[0-9]\{1,3\}\(\.[0-9]\{1,3\}\)\{3\}')"
+        ipv4="$(curl -4 -s -f $service)"
-        test -n "$ip" && break
+        ipv6="$(curl -6 -s -f $service)"
+
+        test -n "$ipv4$ipv6" && break
     done
 
-    echo "Found IP address $ip"
+    echo "Found IPv4 address $ipv4"
+    echo "Found IPv6 address $ipv6"
 
-    if [[ -n $ip ]]; then
+    if [[ -z $ipv4 ]]; then
-        # disable glob expansion
+        echo "IPv4 wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
-        set -f
-
-        for sub in ${NAME//;/ }; do
-            record_id=$(echo $domain_records| jq ".domain_records[] | select(.type == \"A\" and .name == \"$sub\") | .id")
-            record_data=$(echo $domain_records| jq -r ".domain_records[] | select(.type == \"A\" and .name == \"$sub\") | .data")
-
-            if [ $(echo "$record_id" | wc -l) -ge 2 ]; then :
-                if [[ "${remove_duplicates}" == "true" ]]; then :
-                    echo "'$sub' domain name has duplicate DNS records, removing duplicates"
-                    record_id_to_delete=$(echo "$record_id"| tail -n +2)
-                    record_id=$(echo "$record_id"| head -1)
-                    record_data=$(echo "$record_data"| head -1)
-
-                    while IFS= read -r line; do
-                        curl -s -X DELETE \
-                            -H "Content-Type: application/json" \
-                            -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
-                            "$dns_list/$line" &> /dev/null
-                    done <<< "$record_id_to_delete"
-                else :
-                    echo "Unable to update '$sub' domain name as it has duplicate DNS records. Set REMOVE_DUPLICATES='true' to remove them."
-                    continue
-                fi
-            fi
-
-            # re-enable glob expansion
-            set +f
-
-            data="{\"type\": \"A\", \"name\": \"$sub\", \"data\": \"$ip\"}"
-            url="$dns_list/$record_id"
-
-            if [[ -z $record_id ]]; then
-                echo "No record found with '$sub' domain name. Creating record, sending data=$data to url=$url"
-
-                new_record=$(curl -s -X POST \
-                    -H "Content-Type: application/json" \
-                    -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
-                    -d "$data" \
-                    "$url")
-
-                record_data=$(echo $new_record| jq -r ".data")
-            fi
-
-            if [[ "$ip" != "$record_data" ]]; then
-                echo "existing DNS record address ($record_data) doesn't match current IP ($ip), sending data=$data to url=$url"
-
-                curl -s -X PUT \
-                    -H "Content-Type: application/json" \
-                    -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
-                    -d "$data" \
-                    "$url" &> /dev/null
-            else
-                echo "existing DNS record address ($record_data) did not need updating"
-            fi
-        done
     else
-        echo "IP wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
+      configure_record $ipv4 "A"
     fi
 
+    if [[ -z $ipv6 ]]; then
+        echo "IPv6 wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
+    else
+      configure_record $ipv6 "AAAA"
+    fi 
+
     sleep $sleep_interval
 done