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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methodes used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Anytun is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with anytun. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _ENCRYPTED_PACKET_H_
#define _ENCRYPTED_PACKET_H_
#include "datatypes.h"
#include "buffer.h"
class Cipher;
class EncryptedPacket : public Buffer
{
public:
/**
* Packet constructor
* @param the length of the payload
* @param allow reallocation of buffer
*/
EncryptedPacket(u_int32_t payload_length, bool allow_realloc = false);
/**
* Packet destructor
*/
~EncryptedPacket() {};
/**
* Get the sequence number
* @return seqence number
*/
seq_nr_t getSeqNr() const;
/**
* Set the seqence number
* @param seq_nr sequence number
*/
void setSeqNr(seq_nr_t seq_nr);
/**
* Get the sender id
* @return sender id
*/
sender_id_t getSenderId() const;
/**
* Set the sender id
* @param sender_id sender id
*/
void setSenderId(sender_id_t sender_id);
/**
* Get the mulitplex id
* @return multiplex id
*/
mux_t getMux() const;
/**
* Set the multiplex id
* @param mux multiplex id
*/
void setMux(mux_t mux);
/**
* Set the header of a packet
* @param seq_nr sequence number
* @param sender_id sender id
* @param mux multiplex id
*/
void setHeader(seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
/**
* Get the length of the payload
* @return the length of the payload
*/
u_int32_t getPayloadLength() const;
/**
* Set the length of the payload
* @param length length of the payload
*/
void setPayloadLength(u_int32_t payload_length);
/**
* Get the the payload
* @return the Pointer to the payload
*/
u_int8_t* getPayload();
u_int8_t* getAuthenticatedPortion();
u_int32_t getAuthenticatedPortionLength();
void withAuthTag(bool b);
void addAuthTag();
void removeAuthTag();
u_int8_t* getAuthTag();
u_int32_t getAuthTagLength();
private:
EncryptedPacket();
EncryptedPacket(const EncryptedPacket &src);
void reinit();
struct ATTR_PACKED HeaderStruct
{
seq_nr_t seq_nr;
sender_id_t sender_id;
mux_t mux;
};
struct HeaderStruct* header_;
u_int8_t * payload_;
u_int8_t * auth_tag_;
static const u_int32_t AUTHTAG_SIZE = 10; // TODO: hardcoded size
};
#endif
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