Class: Shadowsocks::IPDetector

Inherits:
Object
  • Object
show all
Defined in:
lib/shadowsocks/ip_detector.rb

Constant Summary collapse

GFW_LIST_PATH = 
File.expand_path('../../../data/gfwlist.txt', __FILE__)

Instance Method Summary collapse

Constructor Details

#initialize ⇒ IPDetector

Returns a new instance of IPDetector.



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# File 'lib/shadowsocks/ip_detector.rb', line 9

def initialize
  @internals = {}
  @nums      = []
  @dns_cache = {}
  lines = File.readlines(GFW_LIST_PATH)
  lines.each do |line|
    num = IPAddr.new(line).to_i
    @nums << num
    @internals[num.to_s] = line
  end
  @nums.sort!
end

Instance Method Details

#behind_gfw?(domain) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shadowsocks/ip_detector.rb', line 22

def behind_gfw?(domain)
  key = Digest::MD5.hexdigest domain

  if @dns_cache[key]
    @dns_cache[key]
  else
    begin
      ip = IPSocket::getaddress(domain)

      ip_num = IPAddr.new(ip).to_i

      i = @nums.bsearch { |x| x > ip_num }
      index = @nums.index(i) - 1
      r = IPAddr.new(@internals[@nums[index].to_s]).include? ip
      if @dns_cache.size > 512
        @dns_cache.delete @dns_cache.first[0]
      end

      @dns_cache[key] = r
      r
    rescue Exception
      false
    end
  end
end