Sha256: 07d7f6e1b5031e83abb04d1a2acb0b7c8b1c00b5c6337852749b5eb93968f3c4
Contents?: true
Size: 1.69 KB
Versions: 8
Compression:
Stored size: 1.69 KB
Contents
# This file is part of PacketGen
# See https://github.com/sdaubert/packetgen for more informations
# Copyright (C) 2016 Sylvain Daubert <sylvain.daubert@laposte.net>
# This program is published under MIT license.
# frozen_string_literal: true
module PacketGen
module Header
# A ICMP header consists of:
# * a {#type} field ({Types::Int8} type),
# * a {#code} field ({Types::Int8} type),
# * a {#checksum} field ({Types::Int16} type),
# * and a {#body}.
#
# == Create a ICMP header
# # standalone
# icmp = PacketGen::Header::ICMP.new
# # in a packet
# pkt = PacketGen.gen('IP').add('ICMP')
# # access to ICMP header
# pkt.icmp # => PacketGen::Header::ICMP
#
# == ICMP attributes
# icmp.code = 0
# icmp.type = 200
# icmp.checksum = 0x248a
# icmp.body.read 'this is a body'
# @author Sylvain Daubert
class ICMP < Base
# ICMP internet protocol number
IP_PROTOCOL = 1
# @!attribute type
# 8-bit ICMP type
# @return [Integer]
define_field :type, Types::Int8
# @!attribute code
# 8-bit ICMP code
# @return [Integer]
define_field :code, Types::Int8
# @!attribute checksum
# 16-bit ICMP checksum
# @return [Integer]
define_field :checksum, Types::Int16
# @!attribute body
# @return [Types::String,Header::Base]
define_field :body, Types::String
# Compute checksum and set +checksum+ field
# @return [Integer]
def calc_checksum
sum = IP.sum16(self)
self.checksum = IP.reduce_checksum(sum)
end
end
self.add_class ICMP
IP.bind ICMP, protocol: ICMP::IP_PROTOCOL
end
end
Version data entries
8 entries across 8 versions & 1 rubygems