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@achillean
Created August 18, 2020 19:19
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Subdomain Discovery in Crystal
require "shodan"
module Subs
VERSION = "0.1.0"
# Basic input validation
if ARGV.size != 2
puts "Usage: subs <api key> <domain>"
exit
end
# Setup the API wrapper
client = Shodan::Client.new(ARGV[0])
begin
# Grab the list of subdomains
domain_info = client.domain(ARGV[1])
if domain_info.data
# Create a unique list of subdomains
# We need to tell the compiler that this value will never be nil
info = domain_info.data.not_nil!.uniq { |item| item.subdomain }
# Print the information
info.each do |item|
if item.subdomain != nil && item.subdomain != ""
puts "#{item.subdomain}.#{ARGV[1]}"
end
end
else
puts "No data available"
end
rescue ex: Shodan::ShodanClientException
puts ex.to_s
end
end
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