metasploit-framework

https://github.com/rapid7/metasploit-framework

Ruby

Metasploit Framework

Net::DNS::Packet#nxdomain?

Chacks whether a query has returned a NXDOMAIN error,
meaning the domain name queried doesn't exists.

  %w[a.com google.com ibm.com d.com].each do |domain|
    response = Net::DNS::Resolver.new.send(domain)
    puts "#{domain} doesn't exist" if response.nxdomain?
  end
    #=> a.com doesn't exist
    #=> d.com doesn't exist

Source | Google | Stack overflow

Edit

git clone [email protected]:rapid7/metasploit-framework.git

cd metasploit-framework

open lib/net/dns/packet.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Net--DNS--Packet-nxdomain--for-pr

# Commit to git

git add lib/net/dns/packet.rbgit commit -m "better docs for Net::DNS::Packet#nxdomain?"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Net--DNS--Packet-nxdomain--for-pr

hub pull-request

# Celebrate!