packet.h

   1 /*
   2  *  anytun
   3  *
   4  *  The secure anycast tunneling protocol (satp) defines a protocol used
   5  *  for communication between any combination of unicast and anycast
   6  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
   7  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
   8  *  ethernet, ip, arp ...). satp directly includes cryptography and
   9  *  message authentication based on the methodes used by SRTP.  It is
  10  *  intended to deliver a generic, scaleable and secure solution for
  11  *  tunneling and relaying of packets of any protocol.
  12  *
  13  *
  14  *  Copyright (C) 2007 anytun.org <satp@wirdorange.org>
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License version 2
  18  *  as published by the Free Software Foundation.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program (see the file COPYING included with this
  27  *  distribution); if not, write to the Free Software Foundation, Inc.,
  28  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  29  */
  30
  31 #ifndef _PACKET_H_
  32 #define _PACKET_H_
  33
  34 #include "datatypes.h"
  35 #include "buffer.h"
  36
  37 class Packet : public Buffer
  38 {
  39 public:
  40   Packet();
  41   Packet(u_int32_t length);
  42   Packet(const Buffer &src);
  43
  44   bool hasHeader() const;
  45   Packet& withHeader(bool b);
  46   seq_nr_t getSeqNr() const;
  47   sender_id_t getSenderId() const;
  48   Packet& addHeader(seq_nr_t seq_nr, sender_id_t sender_id);
  49   Packet& removeHeader();
  50   Packet& setSeqNr(seq_nr_t seq_nr);
  51   Packet& setSenderId(sender_id_t sender_id);
  52
  53   bool hasPayloadType() const;
  54   Packet& withPayloadType(bool b);
  55   payload_type_t getPayloadType() const;
  56   Packet& addPayloadType(payload_type_t payload_type);
  57   Packet& removePayloadType();
  58
  59   bool hasAuthTag() const;
  60   Packet& withAuthTag(bool b);
  61   auth_tag_t getAuthTag() const;
  62   Packet& addAuthTag(auth_tag_t auth_tag);
  63   Packet& removeAuthTag();
  64
  65 private:
  66   struct HeaderStruct
  67   {
  68     seq_nr_t seq_nr;
  69     sender_id_t sender_id;
  70   }__attribute__((__packed__));
  71   bool has_header_;
  72   bool has_payload_type_;
  73   bool has_auth_tag_;
  74 };
  75
  76 #endif