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postmodern/resolv_weirdness.rb

Last active October 10, 2017 17:44
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Resolv::DNS weirdness
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resolv_weirdness.rb
require 'resolv'
puts "Normal behavior:"
dns = Resolv::DNS.new
p dns.getaddresses('twitter.com')
# => [#<Resolv::IPv4 104.244.42.1>, #<Resolv::IPv4 104.244.42.193>]
puts "With search: option:"
dns = Resolv::DNS.new(search: ['.'])
p dns.getaddresses('twitter.com')
# => []
puts "With ndots: option:"
dns = Resolv::DNS.new(ndots: 1)
p dns.getaddresses('twitter.com')
# => []
puts "With search: and ndots: options:"
dns = Resolv::DNS.new(search: ['.'], ndots: 1)
p dns.getaddresses('twitter.com')
# => []
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