Method: PacketFu::Packet#recalc

Defined in:
lib/packetfu/packet.rb

#recalc(arg = :all) ⇒ Object

Recalculates all the calcuated fields for all headers in the packet. This is important since read() wipes out all the calculated fields such as length and checksum and what all.



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# File 'lib/packetfu/packet.rb', line 119

def recalc(arg=:all)
  case arg
  when :ip
    ip_recalc(:all)
  when :ipv6
    ipv6_recalc(:all)
  when :icmp
    icmp_recalc(:all)
  when :udp
    udp_recalc(:all)
  when :tcp
    tcp_recalc(:all)
  when :all
    ip_recalc(:all) if @ip_header
    ipv6_recalc(:all) if @ipv6_header
    icmp_recalc(:all) if @icmp_header
    udp_recalc(:all) if @udp_header
    tcp_recalc(:all) if @tcp_header
  else
    raise ArgumentError, "Recalculating `#{arg}' unsupported. Try :all"
  end
  @headers[0]
end