30 lines
702 B
Ruby
30 lines
702 B
Ruby
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require 'resolv'
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require 'resolv-replace'
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def multiple_lookup(*names)
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dns = Resolv::DNS.new
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results = {}
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threads = []
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names.each do |name|
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threads << Thread.new(name) do |name|
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begin
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dns.each_address(name) { |a| (results[name] ||= []) << a }
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rescue Resolv::ResolvError
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results[name] = nil
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end
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end
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end
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threads.each { |t| t.join }
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return results
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end
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domains = ("a".."z").collect { |l| l + '.com' }
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multiple_lookup(*domains).sort.each do |name, addresses|
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if addresses
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puts "#{name}: #{addresses.size} " + \
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"address#{addresses.size == 1 ? "" : "es"}"
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end
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end
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