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DNS Text Record Monitor

This script continuously monitors a domain name for the presence of specified DNS TXT records. The typical use case is for site verification, where you need to prove that you own or control a particular domain or website. This proof is often required to gain access to certain features or settings provided by web services or search engines. By adding a specific TXT record to your domain's DNS configuration, you demonstrate ownership or control of the domain to these services.

Usage

Viewing a Domain's Text Records

To see the current text records of a domain, use the following command:

dig +short TXT "$domain"

Running the Code Locally

With Default Arguments

  1. Clone this repository.
  2. Create a virtual environment (optional but recommended).
  3. Install the necessary dependencies:
pip install -r requirements.txt

markdown Copy code 4. Run the script:

./dns_monitor.py

With Custom Arguments

  1. Clone this repository.
  2. Create a virtual environment (optional but recommended).
  3. Install the necessary dependencies:
pip install -r requirements.txt
4. Run the script with custom arguments:
./dns_monitor.py --targethost=google.com --substring=docusign

Running the Code via Docker

You can also run the script in a Docker container:

docker run -t -i ghcr.io/aricg/dns-text-record-monitor:latest

This will execute the script with the default arguments.

Customizing Script Execution in Docker

You can customize the script execution by setting environment variables:

docker run -t -i
-e TARGETHOSTNAME=google.com
-e SUBSTRING=google-site-verification
-e DELAY=10
ghcr.io/aricg/dns-text-record-monitor:latest

In this example, the script will monitor the google.com domain for the presence of google-site-verification TXT records and will perform the check every 10 seconds.

Example Output

2023-05-15 18:00:22 - Found new 'google-site-verification' key '5b2Ows2wRigUWdMsNX-LPNNo-wyRYULK6Gd2yvbTypQ' in TXT record
2023-05-15 18:00:22 - Found new 'google-site-verification' key 'SQ7PKFx3wTU6BmkOSX03TAidepYF1pZwfcf9F_FZSrg' in TXT record
2023-05-15 18:00:22 - Found new 'google-site-verification' key 'VGI_ot-3h14rDOnZIuMvMVYiR-YxO0VI4o1dMvzLyXM' in TXT record
2023-05-15 18:00:27 - No new keys found in this loop for futurestay.com

In this example, the script found new keys for google-site-verification in the TXT records of the domain futurestay.com. After a delay, it checked again and found no new keys.