Method: Rex::Socket.getaddresses

Defined in:
lib/rex/socket.rb

.getaddresses(hostname, accept_ipv6 = true) ⇒ Array<String>

Wrapper for ::Socket.gethostbyname that takes special care to see if the supplied address is already an ASCII IP address. This is necessary to prevent blocking while waiting on a DNS reverse lookup when we already have what we need.



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# File 'lib/rex/socket.rb', line 176

def self.getaddresses(hostname, accept_ipv6 = true)
  if hostname =~ MATCH_IPV4 or (accept_ipv6 and hostname =~ MATCH_IPV6)
    return [hostname]
  end

  res = ::Socket.gethostbyname(hostname)
  return [] if not res

  # Shift the first three elements out, leaving just the list of
  # addresses
  res.shift # name
  res.shift # alias hostnames
  res.shift # address_family

  # Rubinius has a bug where gethostbyname returns dotted quads instead of
  # NBO, but that's what we want anyway, so just short-circuit here.
  if res[0] =~ MATCH_IPV4 || res[0] =~ MATCH_IPV6
    unless accept_ipv6
      res.reject!{ |ascii| ascii =~ MATCH_IPV6 }
    end
  else
    unless accept_ipv6
      res.reject!{ |nbo| nbo.length != 4 }
    end
    res.map!{ |nbo| self.addr_ntoa(nbo) }
  end

  res
end