buffer.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 _BUFFER_H_
  32 #define _BUFFER_H_
  33
  34 #include "datatypes.h"
  35 #include <string>
  36
  37 class TunDevice;
  38 class UDPPacketSource;
  39
  40 class Buffer
  41 {
  42 public:
  43   Buffer();
  44   Buffer(u_int32_t length);
  45   Buffer(u_int8_t* data, u_int32_t length);
  46   virtual ~Buffer();
  47   Buffer(const Buffer &src);
  48   void operator=(const Buffer &src);
  49   bool operator==(const Buffer &cmp) const;
  50
  51   // math operations to calculate IVs and keys
  52   virtual Buffer operator^(const Buffer &xor_by) const;
  53   virtual Buffer leftByteShift(u_int32_t width) const;
  54   virtual Buffer rightByteShift(u_int32_t width) const;
  55
  56   u_int32_t resizeFront(u_int32_t new_length);
  57   u_int32_t resizeBack(u_int32_t new_length);
  58   u_int32_t getLength() const;
  59   u_int8_t* getBuf();
  60   u_int8_t& operator[](u_int32_t index);
  61   u_int8_t operator[](u_int32_t index) const;
  62   std::string getHexDump() const;
  63
  64   operator u_int8_t*(); // just for write/read tun and packetSource
  65 protected:
  66   friend class TunDevice;
  67   friend class UDPPacketSource;
  68   friend class AesIcmCypher;
  69   friend class KeyDerivation;   //
  70   friend class Mpi;
  71
  72   u_int8_t *buf_;
  73   u_int32_t length_;
  74 };
  75
  76 #endif