encryptedPacket.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 _ENCRYPTED_PACKET_H_
  32 #define _ENCRYPTED_PACKET_H_
  33
  34 #include "datatypes.h"
  35 #include "buffer.h"
  36
  37 class Cipher;
  38 class EncryptedPacket : public Buffer
  39 {
  40 public:
  41
  42   /**
  43    * Packet constructor
  44    * @param the length of the payload
  45    * @param allow reallocation of buffer
  46    */
  47   EncryptedPacket(u_int32_t payload_length, bool allow_realloc = false);
  48
  49   /**
  50    * Packet destructor
  51    */
  52   ~EncryptedPacket() {};
  53
  54   /**
  55    * Get the sequence number
  56    * @return seqence number
  57    */
  58   seq_nr_t getSeqNr() const;
  59
  60   /**
  61    * Set the seqence number
  62    * @param seq_nr sequence number
  63    */
  64   void setSeqNr(seq_nr_t seq_nr);
  65
  66   /**
  67    * Get the sender id
  68    * @return sender id
  69    */
  70   sender_id_t getSenderId() const;
  71
  72   /**
  73    * Set the sender id
  74    * @param sender_id sender id
  75    */
  76   void setSenderId(sender_id_t sender_id);
  77
  78   /**
  79    * Get the mulitplex id
  80    * @return multiplex id
  81    */
  82   mux_t getMux() const;
  83
  84   /**
  85    * Set the multiplex id
  86    * @param mux multiplex id
  87    */
  88   void setMux(mux_t mux);
  89
  90   /**
  91    * Set the header of a packet
  92    * @param seq_nr sequence number
  93    * @param sender_id sender id
  94    * @param mux multiplex id
  95    */
  96   void setHeader(seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
  97
  98   /**
  99    * Get the length of the payload
 100    * @return the length of the payload
 101    */
 102         u_int32_t getPayloadLength() const;
 103
 104   /**
 105    * Set the length of the payload
 106    * @param length length of the payload
 107    */
 108   void setPayloadLength(u_int32_t payload_length);
 109
 110   /**
 111    * Get the the payload
 112    * @return the Pointer to the payload
 113    */
 114   u_int8_t* getPayload();
 115
 116
 117   u_int8_t* getAuthenticatedPortion();
 118   u_int32_t getAuthenticatedPortionLength();
 119
 120   void withAuthTag(bool b);
 121   void addAuthTag();
 122   void removeAuthTag();
 123   u_int8_t* getAuthTag();
 124   u_int32_t getAuthTagLength();
 125
 126 private:
 127   EncryptedPacket();
 128   EncryptedPacket(const EncryptedPacket &src);
 129
 130   void reinit();
 131
 132   struct HeaderStruct
 133   {
 134     seq_nr_t seq_nr;
 135     sender_id_t sender_id;
 136     mux_t mux;
 137   }__attribute__((__packed__));
 138
 139   struct HeaderStruct* header_;
 140         u_int8_t * payload_;
 141   u_int8_t * auth_tag_;
 142   static const u_int32_t AUTHTAG_SIZE = 10;  // TODO: hardcoded size
 143 };
 144
 145 #endif