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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) 2007-2009 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 as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* 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/>.
*/
#include <stdexcept>
#include <iostream>
#include "datatypes.h"
#include "endian.h"
#include "plainPacket.h"
#include "anytunError.h"
PlainPacket::PlainPacket(u_int32_t payload_length, bool allow_realloc) : Buffer(payload_length + sizeof(payload_type_t), allow_realloc)
{
payload_type_ = reinterpret_cast<payload_type_t*>(buf_);
payload_ = buf_ + sizeof(payload_type_t);
*payload_type_ = 0;
}
u_int32_t PlainPacket::getHeaderLength()
{
return sizeof(payload_type_t);
}
payload_type_t PlainPacket::getPayloadType() const
{
if(payload_type_)
return PAYLOAD_TYPE_T_NTOH(*payload_type_);
return 0;
}
void PlainPacket::setPayloadType(payload_type_t payload_type)
{
if(!payload_type_)
return;
if(payload_type == PAYLOAD_TYPE_TUN) {
if(!payload_) {
*payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN);
return;
}
char * ip_version_ptr = reinterpret_cast<char *>(payload_);
char ip_version = ip_version_ptr[0];
ip_version >>=4;
if(ip_version == 4)
*payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN4);
else if(ip_version == 6)
*payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN6);
}
else
*payload_type_ = PAYLOAD_TYPE_T_HTON(payload_type);
}
u_int32_t PlainPacket::getPayloadLength() const
{
if(!payload_)
return 0;
return (length_ > sizeof(payload_type_t)) ? (length_ - sizeof(payload_type_t)) : 0;
}
void PlainPacket::setPayloadLength(u_int32_t payload_length)
{
Buffer::setLength(payload_length + sizeof(payload_type_t));
// depending on allow_realloc buf_ may point to another address
// therefore in this case reinit() gets called by Buffer::setLength()
}
void PlainPacket::reinit()
{
payload_type_ = reinterpret_cast<payload_type_t*>(buf_);
payload_ = buf_ + sizeof(payload_type_t);
if(length_ <= (sizeof(payload_type_t)))
payload_ = NULL;
if(length_ < (sizeof(payload_type_t))) {
payload_type_ = NULL;
AnytunError::throwErr() << "plain packet can't be initialized, buffer is too small";
}
}
u_int8_t* PlainPacket::getPayload()
{
return payload_;
}
/*
NetworkAddress PlainPacket::getSrcAddr() const
{
if(!payload_type_ || !payload_)
return NetworkAddress();
payload_type_t type = PAYLOAD_TYPE_T_NTOH(*payload_type_);
if(type == PAYLOAD_TYPE_TAP) // Ehternet
{
// TODO
return NetworkAddress();
}
else if(type == PAYLOAD_TYPE_TUN4) // IPv4
{
if(length_ < (sizeof(payload_type_t)+sizeof(struct ip)))
return NetworkAddress();
struct ip* hdr = reinterpret_cast<struct ip*>(payload_);
return NetworkAddress(hdr->ip_src);
}
else if(type == PAYLOAD_TYPE_TUN6) // IPv6
{
if(length_ < (sizeof(payload_type_t)+sizeof(struct ip6_hdr)))
return NetworkAddress();
struct ip6_hdr* hdr = reinterpret_cast<struct ip6_hdr*>(payload_);
return NetworkAddress(hdr->ip6_src);
}
return NetworkAddress();
}*/
NetworkAddress PlainPacket::getDstAddr() const
{
if(!payload_type_ || !payload_)
return NetworkAddress();
payload_type_t type = PAYLOAD_TYPE_T_NTOH(*payload_type_);
if(type == PAYLOAD_TYPE_TAP) // Ehternet
{
// TODO
return NetworkAddress();
}
else if(type == PAYLOAD_TYPE_TUN4) // IPv4
{
if(length_ < (sizeof(payload_type_t)+5*4))
return NetworkAddress();
char * hdr = reinterpret_cast<char *>(payload_);
boost::asio::ip::address_v4::bytes_type ip_octets;
for (int i=0; i<4;i++)
ip_octets[i]=hdr[4*4+i];
return NetworkAddress(boost::asio::ip::address_v4(ip_octets));
}
else if(type == PAYLOAD_TYPE_TUN6) // IPv6
{
if(length_ < (sizeof(payload_type_t)+2*16+2*4))
return NetworkAddress();
char * hdr = reinterpret_cast<char *>(payload_);
boost::asio::ip::address_v6::bytes_type ip_octets;
for (int i=0; i<16;i++)
ip_octets[i]=hdr[2*4+16+i];
return NetworkAddress(boost::asio::ip::address_v6(ip_octets));
}
return NetworkAddress();
}
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