plainPacket.cpp

   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 #include <stdexcept>
  32 #include <iostream>
  33 #include <arpa/inet.h>
  34
  35 #include "datatypes.h"
  36 #include "plainPacket.h"
  37
  38
  39 PlainPacket::PlainPacket(u_int32_t payload_length, bool allow_realloc) : Buffer(payload_length + sizeof(payload_type_t), allow_realloc)
  40 {
  41   payload_type_ = reinterpret_cast<payload_type_t*>(buf_);
  42   payload_ = buf_ + sizeof(payload_type_t);
  43   *payload_type_ = 0;
  44 }
  45
  46 payload_type_t PlainPacket::getPayloadType() const
  47 {
  48   return PAYLOAD_TYPE_T_NTOH(*payload_type_);
  49 }
  50
  51 void PlainPacket::setPayloadType(payload_type_t payload_type)
  52 {
  53   if(payload_type_)
  54     *payload_type_ = PAYLOAD_TYPE_T_HTON(payload_type);
  55 }
  56
  57 u_int32_t PlainPacket::getPayloadLength() const
  58 {
  59   return (length_ > sizeof(payload_type_t)) ? (length_ - sizeof(payload_type_t)) : 0;
  60 }
  61
  62 void PlainPacket::setPayloadLength(u_int32_t payload_length)
  63 {
  64   Buffer::setLength(payload_length + sizeof(payload_type_t));
  65
  66   // depending on allow_realloc buf_ may point to another address
  67   payload_type_ = reinterpret_cast<payload_type_t*>(buf_);
  68   payload_ = buf_ + sizeof(payload_type_t);
  69 }
  70
  71 u_int8_t* PlainPacket::getPayload()
  72 {
  73   return payload_;
  74 }