developer.intra2net.com Git - pingcheck/blob - src/ip/ipv4header.h

   1 // Copyright (c) 2003-2010 Christopher M. Kohlhoff
   2 // Modifications (c) 2011 by Guilherme Maciel Ferreira / Intra2net AG
   3 //
   4 // Distributed under the Boost Software License, Version 1.0.
   5 //    (See accompanying file LICENSE_1_0.txt or copy at
   6 //          http://www.boost.org/LICENSE_1_0.txt)
   7 #ifndef IPV4_HEADER_H
   8 #define IPV4_HEADER_H
   9
  10 #include <stdint.h>
  11
  12 #include <boost/asio/ip/address_v4.hpp>
  13
  14 #include "ip/ipheader.h"
  15 #include "host/messagepayload.h"
  16
  17 //-----------------------------------------------------------------------------
  18 // Ipv4Header
  19 //-----------------------------------------------------------------------------
  20
  21 /**
  22  * @brief This class represents the IP version 4 Packet Header.
  23  *
  24  * The IPv4 header format is:
  25  *
  26  * @code
  27  * 0      3 4     7 8            15 16                           31
  28  * +-------+-------+---------------+------------------------------+      ---
  29  * |       |       |               |                              |       ^
  30  * |version|header | differentiated|    total length in bytes     |       |
  31  * |  (4)  | length|    services   |                              |       |
  32  * +-------+-------+---------------+-+-+-+------------------------+       |
  33  * |                               | | | |                        |       |
  34  * |        identification         |0|D|M|    fragment offset     |       |
  35  * |                               | |F|F|                        |       |
  36  * +---------------+---------------+-+-+-+------------------------+       |
  37  * |               |               |                              |       |
  38  * | time to live  |   protocol    |       header checksum        |   20 bytes
  39  * |               |               |                              |       |
  40  * +---------------+---------------+------------------------------+       |
  41  * |                                                              |       |
  42  * |                      source IPv4 address                     |       |
  43  * |                                                              |       |
  44  * +--------------------------------------------------------------+       |
  45  * |                                                              |       |
  46  * |                   destination IPv4 address                   |       |
  47  * |                                                              |       v
  48  * +--------------------------------------------------------------+      ---
  49  * |                                                              |       ^
  50  * |                                                              |       |
  51  * /                        options (if any)                      /    0 - 40
  52  * /                                                              /     bytes
  53  * |                                                              |       |
  54  * |                                                              |       v
  55  * +--------------------------------------------------------------+      ---
  56  * @endcode
  57  */
  58 class Ipv4Header : public IpHeader
  59 {
  60 public:
  61     Ipv4Header();
  62
  63     uint8_t get_version() const;
  64     uint16_t get_header_length() const;
  65     uint8_t get_differentiated_services() const;
  66     uint16_t get_total_length() const;
  67
  68     uint16_t get_identification() const;
  69     bool dont_fragment() const;
  70     bool more_fragments() const;
  71     uint16_t get_fragment_offset() const;
  72
  73     uint8_t get_time_to_live() const;
  74     uint8_t get_protocol() const;
  75     uint16_t get_header_checksum() const;
  76
  77     boost::asio::ip::address get_source_address() const;
  78     boost::asio::ip::address get_destination_address() const;
  79
  80     friend std::istream &operator>>(
  81             std::istream &is,
  82             Ipv4Header &header
  83     );
  84
  85 private:
  86     MessagePayload Payload;
  87
  88 };
  89
  90 #endif // IPV4_HEADER_H