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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 anytun.org <satp@wirdorange.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdexcept>
#include <iostream>
#include <arpa/inet.h>
#include <cstdio> // for std::memcpy
#include "encryptedPacket.h"
#include "datatypes.h"
#include "authTag.h"
#include "log.h"
// TODO: fix auth_tag stuff
EncryptedPacket::EncryptedPacket(u_int32_t payload_length, bool allow_realloc)
: Buffer(payload_length + sizeof(struct HeaderStruct), allow_realloc)
{
header_ = reinterpret_cast<struct HeaderStruct*>(buf_);
payload_ = buf_ + sizeof(struct HeaderStruct); // TODO: fix auth_tag stuff
auth_tag_ = NULL; // TODO: fix auth_tag stuff
if(header_)
{
header_->seq_nr = 0;
header_->sender_id = 0;
header_->mux = 0;
}
}
seq_nr_t EncryptedPacket::getSeqNr() const
{
if(header_)
return SEQ_NR_T_NTOH(header_->seq_nr);
return 0;
}
sender_id_t EncryptedPacket::getSenderId() const
{
if(header_)
return SENDER_ID_T_NTOH(header_->sender_id);
return 0;
}
mux_t EncryptedPacket::getMux() const
{
if(header_)
return MUX_T_NTOH(header_->mux);
return 0;
}
void EncryptedPacket::setSeqNr(seq_nr_t seq_nr)
{
if(header_)
header_->seq_nr = SEQ_NR_T_HTON(seq_nr);
}
void EncryptedPacket::setSenderId(sender_id_t sender_id)
{
if(header_)
header_->sender_id = SENDER_ID_T_HTON(sender_id);
}
void EncryptedPacket::setMux(mux_t mux)
{
if(header_)
header_->mux = MUX_T_HTON(mux);
}
void EncryptedPacket::setHeader(seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux)
{
if(!header_)
return;
header_->seq_nr = SEQ_NR_T_HTON(seq_nr);
header_->sender_id = SENDER_ID_T_HTON(sender_id);
header_->mux = MUX_T_HTON(mux);
}
u_int32_t EncryptedPacket::getPayloadLength() const
{
return (length_ > sizeof(struct HeaderStruct)) ? (length_ - sizeof(struct HeaderStruct)) : 0; // TODO: fix auth_tag stuff
}
void EncryptedPacket::setPayloadLength(u_int32_t payload_length)
{
Buffer::setLength(payload_length + sizeof(struct HeaderStruct));
// depending on allow_realloc buf_ may point to another address
// therefore in this case reinit() gets called by Buffer::setLength()
}
void EncryptedPacket::reinit()
{
Buffer::reinit();
header_ = reinterpret_cast<struct HeaderStruct*>(buf_);
payload_ = buf_ + sizeof(struct HeaderStruct); // TODO: fix auth_tag stuff
auth_tag_ = NULL; // TODO: fix auth_tag stuff
}
u_int8_t* EncryptedPacket::getPayload()
{
return payload_;
}
// TODO: fix auth_tag stuff
bool EncryptedPacket::hasAuthTag() const
{
// if( auth_tag_ == NULL )
return false;
// return true;
}
void EncryptedPacket::withAuthTag(bool b)
{
// if( b && (auth_tag_ != NULL) )
// throw std::runtime_error("packet already has auth tag function enabled");
// //TODO: return instead?
// if( ! b && (auth_tag_ == NULL) )
// throw std::runtime_error("packet already has auth tag function disabled");
// //TODO: return instead?
// if( b ) {
// auth_tag_ = reinterpret_cast<AuthTag*>( buf_ + sizeof(struct HeaderStruct) );
// payload_ = payload_ + AUTHTAG_SIZE;
// length_ -= AUTHTAG_SIZE;
// max_length_ -= AUTHTAG_SIZE;
// } else {
// payload_ = reinterpret_cast<u_int8_t*>( auth_tag_ );
// length_ += AUTHTAG_SIZE;
// max_length_ += AUTHTAG_SIZE;
// auth_tag_ = NULL;
// }
}
void EncryptedPacket::setAuthTag(AuthTag& tag)
{
// if( auth_tag_ == NULL )
// throw std::runtime_error("auth tag not enabled");
// if( tag == AuthTag(0) )
// return;
// if( tag.getLength() != AUTHTAG_SIZE )
// throw std::length_error("authtag length mismatch with AUTHTAG_SIZE");
// std::memcpy( auth_tag_, tag.getBuf(), AUTHTAG_SIZE );
}
AuthTag EncryptedPacket::getAuthTag() const
{
// if( auth_tag_ == NULL )
// throw std::runtime_error("auth tag not enabled");
AuthTag at(AUTHTAG_SIZE);
// std::memcpy(at, auth_tag_, AUTHTAG_SIZE );
return at;
}
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