src/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) 2007-2008 Othmar Gsenger, Erwin Nindl,
  15  *                          Christian Pointner <satp@wirdorange.org>
  16  *
  17  *  This file is part of Anytun.
  18  *
  19  *  Anytun is free software: you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License version 3 as
  21  *  published by the Free Software Foundation.
  22  *
  23  *  Anytun is distributed in the hope that it will be useful,
  24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *  GNU General Public License for more details.
  27  *
  28  *  You should have received a copy of the GNU General Public License
  29  *  along with anytun.  If not, see <http://www.gnu.org/licenses/>.
  30  */
  31
  32 #ifndef _BUFFER_H_
  33 #define _BUFFER_H_
  34
  35 #include "datatypes.h"
  36 #include <string>
  37
  38 class TunDevice;
  39 class UDPPacketSource;
  40
  41 class Buffer
  42 {
  43 public:
  44   Buffer(bool allow_realloc = true);
  45   Buffer(u_int32_t length, bool allow_realloc = true);
  46   Buffer(u_int8_t* data, u_int32_t length, bool allow_realloc = true);
  47   Buffer(std::string hex_data, bool allow_realloc = true);
  48   virtual ~Buffer();
  49   Buffer(const Buffer &src);
  50   void operator=(const Buffer &src);
  51   bool operator==(const Buffer &cmp) const;
  52   Buffer operator^(const Buffer &xor_by) const;
  53
  54   u_int32_t getLength() const;
  55   virtual void setLength(u_int32_t new_length);
  56   u_int8_t* getBuf();
  57   u_int8_t& operator[](u_int32_t index);
  58   u_int8_t operator[](u_int32_t index) const;
  59   std::string getHexDump() const;
  60   std::string getHexDumpOneLine() const;
  61
  62   bool isReallocAllowed() const;
  63
  64   operator u_int8_t*();
  65
  66 protected:
  67   virtual void reinit() {};
  68
  69   u_int8_t *buf_;
  70   u_int32_t length_;
  71   u_int32_t real_length_;
  72   bool allow_realloc_;
  73
  74   static const u_int32_t OVER_SIZE_ = 100;
  75 };
  76
  77 #endif