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lambda_function_route53-bind.py

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+import boto3
+import datetime
+
+def generate_bind_zone_file(domain_name, records):
+    """
+    Generates a simplified BIND zone file as a string,
+    using the real SOA and NS records from the hosted zone.
+    """
+
+    # Find the SOA record for the domain
+    soa_record = next(
+        (r for r in records if r['Type'] == 'SOA' and r['Name'].rstrip('.') == domain_name),
+        None
+    )
+    if not soa_record:
+        raise ValueError(f"SOA record not found for domain {domain_name}")
+
+    # Find the NS records for the domain
+    ns_records = [
+        r for r in records if r['Type'] == 'NS' and r['Name'].rstrip('.') == domain_name
+    ]
+    if not ns_records:
+        raise ValueError(f"NS records not found for domain {domain_name}")
+
+    output = []
+    output.append(f"$TTL {soa_record.get('TTL', 300)}")
+
+    # Build SOA record using the real fields
+    soa_value = soa_record['ResourceRecords'][0]['Value']
+    output.append(f"@  IN  SOA {soa_value}")
+
+    # Add NS records
+    for ns_record in ns_records:
+        for rr in ns_record.get('ResourceRecords', []):
+            output.append(f"@  IN  NS  {rr['Value']}")
+
+    output.append("")
+
+    # Add other records (except SOA and NS)
+    for record in records:
+        record_name = record['Name'].rstrip('.')
+        record_type = record['Type']
+        ttl = record.get('TTL', 300)
+        values = record.get('ResourceRecords', [])
+
+        if record_type in ['SOA', 'NS'] and record_name == domain_name:
+            continue  # Already handled
+
+        for val in values:
+            val_str = val['Value']
+            # Use '@' for root domain
+            name_display = '@' if record_name == domain_name else record_name
+            output.append(f"{name_display} {ttl} IN {record_type} {val_str}")
+
+    return "\n".join(output)
+
+
+def lambda_handler(event, context):
+    client = boto3.client('route53')
+    response = client.list_hosted_zones()
+    zones = response['HostedZones']
+
+    output = []
+
+    for zone in zones:
+        zone_id = zone['Id'].split("/")[-1]
+        domain_name = zone['Name'].rstrip('.')
+
+        records_response = client.list_resource_record_sets(HostedZoneId=zone_id)
+        records = records_response['ResourceRecordSets']
+
+        # Generate BIND zone file for the domain
+        bind_file = generate_bind_zone_file(domain_name, records)
+
+        output.append({
+            "domain": domain_name,
+            "bind_file": bind_file
+        })
+
+    return {
+        "statusCode": 200,
+        "zones": output
+    }