Module: ShadowsocksRuby::Util

Defined in:
lib/shadowsocks_ruby/util.rb

Overview

Various utility functions

Constant Summary collapse

ATYP_IPV4 = 
1
ATYP_DOMAIN = 
3
ATYP_IPV6 = 
4

Class Method Summary collapse

Class Method Details

.bin2hex(bytes) ⇒ String

Hex encodes a message

Parameters:

  • bytes (String) —

    The bytes to encode

Returns:

  • (String) —

    Tasty, tasty hexadecimal



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# File 'lib/shadowsocks_ruby/util.rb', line 15

def bin2hex(bytes)
  bytes.to_s.unpack("H*").first
end

.hex2bin(hex) ⇒ String

Hex decodes a message

Parameters:

  • hex (String) —

    hex to decode.

Returns:

  • (String) —

    crisp and clean bytes



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# File 'lib/shadowsocks_ruby/util.rb', line 24

def hex2bin(hex)
  [hex.to_s].pack("H*")
end

.parse_address_bin(bytes) ⇒ Array<String, Integer>

Parse address bytes

Parameters:

  • bytes (String) —

    The bytes to parse

Returns:

  • (Array<String, Integer>) —

    Return Host, Port



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# File 'lib/shadowsocks_ruby/util.rb', line 31

def parse_address_bin(bytes)
  bytes = bytes.dup
  address_type = bytes.slice!(0, 1).unpack("C").first
  case address_type
  when ATYP_IPV4
    host = IPAddr.ntop bytes.slice!(0, 4)
    port = bytes.slice!(0, 2).unpack('n').first
    [host, port]
  when ATYP_IPV6
    host = IPAddr.ntop bytes.slice!(0, 16)
    port = bytes.slice!(0, 2).unpack('n').first
    [host, port]
  when ATYP_DOMAIN
    domain_len = bytes.slice!(0, 1).unpack("C").first
    host = bytes.slice!(0, domain_len)
    port = bytes.slice!(0, 2).unpack('n').first
    [host, port]
  else
    raise PharseError, "unknown address_type: #{address_type}"
  end
end