This script uses ArvanCloud DNS/CDN services to implement DDNS for you to access your home computing board or camera...

arvancloud-ddns.sh

#!/bin/bash

# === Configuration ===
ZONE_NAME="my-domain.ir"
RECORD_NAME="my-a-record"
API_TOKEN="Apikey xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx"
API_URL="https://napi.arvancloud.ir/cdn/4.0/domains"

# === Get current public IP ===
CURRENT_IP=$(curl -s ifconfig.io/ip)

# === Get current DNS record IP ===
DNS_IP=$(dig +short ${RECORD_NAME}.${ZONE_NAME})

# === Exit if IPs could not be retrieved ===
if [ -z "$CURRENT_IP" ] || [ -z "$DNS_IP" ]; then
  echo "❌ Failed to retrieve IP addresses"
  exit 1
fi

echo "✅ Current IP: $CURRENT_IP"
echo "📌 DNS IP: $DNS_IP"

# === If IP has not changed, do nothing ===
if [ "$CURRENT_IP" == "$DNS_IP" ]; then
  echo "ℹ IP has not changed. No update needed."
  exit 0
fi

# === Retrieve record ID from ArvanCloud ===
RECORDS=$(curl -s -H "authorization: ${API_TOKEN}" "${API_URL}/${ZONE_NAME}/dns-records")
RECORD_ID=$(echo "${RECORDS}" | jq -r ".data[] | select(.name == \"${RECORD_NAME}\") | .id")
echo The ID for $RECORD_NAME is $RECORD_ID

# === Check if record was found ===
if [ -z "$RECORD_ID" ]; then
  echo "❌ DNS record not found."
  exit 1
fi

echo "🛠 Updating DNS record..."

# === Update DNS record with new IP ===
UPDATE_RESULT=$(curl -s --request PUT --location "$API_URL/$ZONE_NAME/dns-records/$RECORD_ID" \
--header "Content-Type: application/json" \
--header "authorization: $API_TOKEN" \
--data '{
    "id": "'"$RECORD_ID"'",
    "type": "a",
    "name": "'"$RECORD_NAME"'",
    "value": [
        {
            "ip": "'"$CURRENT_IP"'"
        }
    ],
    "cloud": false
}')

# === Check if update was successful ===
if echo "$UPDATE_RESULT" | grep -q 'DNS record updated'; then
  echo "✅ DNS record updated successfully to $CURRENT_IP"
else
  echo "❌ Failed to update DNS record:"
  echo "$UPDATE_RESULT"
  exit 1
fi