Ajay Krishnan
328fa39c55
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29 lines
763 B
Ruby
Executable File
29 lines
763 B
Ruby
Executable File
#!/usr/bin/env ruby
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# frozen_string_literal: true
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require "ipaddr"
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route_path = ARGV.fetch(0, "/proc/net/route")
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routes = File.foreach(route_path).drop(1).filter_map do |line|
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fields = line.split
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next unless fields.length >= 8
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next unless fields.fetch(1) == "00000000"
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next unless (fields.fetch(3).to_i(16) & 0x2) == 0x2
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fields
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end
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routes.sort_by { |fields| fields.fetch(6).to_i }.each do |fields|
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gateway_hex = fields.fetch(2)
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next unless gateway_hex.match?(/\A[0-9A-Fa-f]{8}\z/)
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gateway = gateway_hex.scan(/../).reverse.map { |octet| octet.to_i(16) }.join(".")
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address = IPAddr.new(gateway)
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next unless address.ipv4? && address.private?
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puts address
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exit 0
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end
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abort "no private IPv4 default-route gateway found in #{route_path}"
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