Add address change logging to ddns script

.gitignore

@@ -1,4 +1,4 @@
-cloudflare_token.ini
+cloudflare ddns/ddns_config.ini
-.vscode/settings.json
+.vscode
 .vault_pass
 .ansible_facts.json

.vscode/launch.json

@@ -1,19 +0,0 @@
-{
-    // Use IntelliSense to learn about possible attributes.
-    // Hover to view descriptions of existing attributes.
-    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "name": "Python Debugger: Current File with Arguments",
-            "type": "debugpy",
-            "request": "launch",
-            "program": "${file}",
-            "console": "integratedTerminal",
-            "args": [
-                "wireguard.arnhem",
-                "--credential-file", "./cloudflare_token.ini"
-            ]
-        }
-    ]
-}

cloudflare ddns/cloudflare_ddns.py

@@ -24,7 +24,11 @@ def get_public_IP():
 
 def resolve_name(domain):
     logging.info(f'Resolving {domain}...')
+    try:
         result = dns.resolver.resolve(domain, 'A')
+    except dns.resolver.NXDOMAIN:
+        logging.error(f'No DNS record exists for {domain}, configure it first before using this ddns script. Exiting...')
+        exit(1)
 
     resolved_address = result[0].address
     logging.info(f'Resolved {domain} to: {resolved_address}.')
@@ -69,28 +73,38 @@ def change_record(subdomain, zoneId, recordId):
 
 parser = argparse.ArgumentParser()
 parser.add_argument('subdomain')
-parser.add_argument('-c', '--credential-file', dest='token')
+parser.add_argument('-c', '--config-file', dest='config')
 
 args = parser.parse_args()
 
 subdomain = args.subdomain
-cloudflare_token_path = args.token
+config_file_path = args.config
 
 fixedTopLevelDomain = 'kleinendorst.info'
 fullDomainName = f'{subdomain}.{fixedTopLevelDomain}'
 
-publicIP = get_public_IP()
-
-if resolve_name(fullDomainName) == publicIP:
-    logging.info(f'Currently resolved name already matches the public ip ({publicIP}), exiting...')
-    exit(0)
-    
 config = configparser.ConfigParser()
-config.read(cloudflare_token_path)
+config.read(config_file_path)
 
 cloudflare_api_credentials = config['credentials']['dns_cloudflare_token']
 cloudflare_request_headers = {'Content-Type': 'application/json', 'Authorization': f'Bearer {cloudflare_api_credentials}'}
 
+log_path = config.get('log_changes', 'log_path', fallback=None)
+if log_path is not None:
+    log_path = config['log_changes']['log_path']
+    logging.info(f'Logging DNS name changes to {log_path} on IP updates.')
+
+resolvedIP = resolve_name(fullDomainName)
+publicIP = get_public_IP()
+if resolvedIP == publicIP:
+    logging.info(f'Currently resolved name already matches the public ip ({publicIP}), exiting...')
+    exit(0)
+
 zoneId = get_zone_id(fixedTopLevelDomain)
 recordId = get_record_id(zoneId, fullDomainName)
 change_record(subdomain, zoneId, recordId)
+
+with open(log_path, 'a+') as log_file:
+    msg = f'Address for FQDN {fullDomainName} altered from: {resolvedIP} - {publicIP}.'
+    logging.info(f'Writing: "{msg}" to log file at {log_path}...')
+    log_file.write(msg + '\n')