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google-safe-search-example #78

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02be311
google-safe-search-example
henri Jun 9, 2021
061ba21
Fixed the soft-tabs
henri Jun 10, 2021
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18 changes: 18 additions & 0 deletions examples/google-force-safe-search/google-safe-search-domain-generator.rb
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
#!/usr/bin/env ruby

# build google force safe search ruls for rubyDNS

google_domains = `curl https://www.google.com/supported_domains 2>> /dev/null | sed "s/^.//g"`.split("\n")
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@ioquatix ioquatix Jun 10, 2021 •
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This can be improved.

require 'async'
require 'async/http/internet'

google_domains = Sync do
	internet = Async::HTTP::Internet.new
	response = internet.get("https://www.google.com/supported_domains")
	
	response.read.split(/\n/)
ensure
	response&.close
end


google_domains.each do | dom |

puts ""
puts "#match #{dom}"
puts "match(/^#{dom}$/, IN::A) do |transaction|"
puts " transaction.respond!(Name.create('forcesafesearch.google.com'), resource_class: IN::CNAME)"
puts "end"
puts "match(/^www.#{dom}$/, IN::A) do |transaction|"
puts " transaction.respond!(Name.create('forcesafesearch.google.com'), resource_class: IN::CNAME)"
puts "end"

end
35 changes: 35 additions & 0 deletions examples/google-force-safe-search/google-safe-search.rb
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#!/usr/bin/env ruby
require 'rubydns'

INTERFACES = [
[:udp, "0.0.0.0", 5300],
[:tcp, "0.0.0.0", 5300],
]

# Use upstream DNS for name resolution.
UPSTREAM = RubyDNS::Resolver.new([
[:udp, "8.8.8.8", 53],
[:tcp, "8.8.8.8", 53]
])

$R = Resolv::DNS.new
Name = Resolv::DNS::Name
IN = Resolv::DNS::Resource::IN

# Start the RubyDNS server
RubyDNS::run_server(INTERFACES) do
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domains = Regexp.union(google_domains)

# Start the RubyDNS server
RubyDNS::run_server(INTERFACES) do
	@logger.debug!
	
	match(domains, IN::A) do |transaction|
		transaction.respond!(Name.create('forcesafesearch.google.com'), resource_class: IN::CNAME)
	end
	
	otherwise do |transaction|
		transaction.passthrough!(UPSTREAM)
	end
end

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Might need to tweak domains but this should avoid having to generate a script/server.

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domains = /#{Regexp.union(google_domains)}\z/

maybe sufficient.

@logger.debug!

#match google.com
match(/^google.com$/, IN::A) do |transaction|
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In order to preserve sub-domains such as admin.google.com, docs.google.com etc.

It may be necessary to do an exact match. Maybe Google handles this? Probably better to only override the specific top level domains for the force safe search?

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I do like the idea you suggested if that can work. Even if it is just matching the exact domains within an array.

transaction.respond!(Name.create('forcesafesearch.google.com'), resource_class: IN::CNAME)
end
match(/^www.google.com$/, IN::A) do |transaction|
transaction.respond!(Name.create('forcesafesearch.google.com'), resource_class: IN::CNAME)
end

otherwise do |transaction|
transaction.passthrough!(UPSTREAM)
end
end