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
  36 class TunDevice;
  37 class UDPPacketSource;
  38
  39 class Buffer
  40 {
  41 public:
  42   Buffer();
  43   Buffer(u_int32_t length);
  44   Buffer(u_int8_t* data, u_int32_t length);
  45   virtual ~Buffer();
  46   Buffer(const Buffer &src);
  47   void operator=(const Buffer &src);
  48
  49   u_int32_t resizeFront(u_int32_t new_length);
  50   u_int32_t resizeBack(u_int32_t new_length);
  51   u_int32_t getLength() const;
  52   u_int8_t* getBuf();
  53   u_int8_t& operator[](u_int32_t index);
  54   u_int8_t operator[](u_int32_t index) const;
  55
  56 protected:
  57   operator u_int8_t*(); // just for write/read tun and packetSource
  58   friend class TunDevice;
  59   friend class UDPPacketSource;
  60   friend class AesIcmCypher;
  61   friend class KeyDerivation;   //
  62
  63   u_int8_t *buf_;
  64   u_int32_t length_;
  65 };
  66
  67 #endif