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/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* 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 methods 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) 2007-2014 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
* uAnytun 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.
*
* uAnytun 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 uAnytun. If not, see <http://www.gnu.org/licenses/>.
*/
#include "datatypes.h"
#include "encrypted_packet.h"
#include <stdlib.h>
#include <string.h>
void encrypted_packet_init(encrypted_packet_t* packet, u_int32_t auth_tag_length)
{
if(!packet)
return;
memset (packet, 0, sizeof(*packet));
if(auth_tag_length > (ENCRYPTED_PACKET_SIZE_MAX - sizeof(encrypted_packet_header_t)))
packet->auth_tag_length_ = ENCRYPTED_PACKET_SIZE_MAX - sizeof(encrypted_packet_header_t);
else
packet->auth_tag_length_ = auth_tag_length;
}
u_int32_t encrypted_packet_get_minimum_length(encrypted_packet_t* packet)
{
if(!packet)
return 0;
return (sizeof(encrypted_packet_header_t) + packet->auth_tag_length_);
}
u_int8_t* encrypted_packet_get_packet(encrypted_packet_t* packet)
{
if(!packet)
return NULL;
return packet->data_.buf_;
}
u_int32_t encrypted_packet_get_length(encrypted_packet_t* packet)
{
if(!packet)
return 0;
return (packet->payload_length_ + sizeof(encrypted_packet_header_t) + packet->auth_tag_length_);
}
void encrypted_packet_set_length(encrypted_packet_t* packet, u_int32_t len)
{
if(!packet)
return;
if(len > ENCRYPTED_PACKET_SIZE_MAX)
len = ENCRYPTED_PACKET_SIZE_MAX - sizeof(encrypted_packet_header_t) - packet->auth_tag_length_;
else if(len < (sizeof(encrypted_packet_header_t) + packet->auth_tag_length_))
len = 0;
else
len -= (sizeof(encrypted_packet_header_t) + packet->auth_tag_length_);
packet->payload_length_ = len;
}
u_int8_t* encrypted_packet_get_payload(encrypted_packet_t* packet)
{
if(!packet || !packet->payload_length_)
return NULL;
return (packet->data_.buf_ + sizeof(encrypted_packet_header_t));
}
u_int32_t encrypted_packet_get_payload_length(encrypted_packet_t* packet)
{
if(!packet)
return 0;
return packet->payload_length_;
}
void encrypted_packet_set_payload_length(encrypted_packet_t* packet, u_int32_t len)
{
if(!packet)
return;
if(len > (ENCRYPTED_PACKET_SIZE_MAX - sizeof(encrypted_packet_header_t) - packet->auth_tag_length_))
len = ENCRYPTED_PACKET_SIZE_MAX - sizeof(encrypted_packet_header_t) - packet->auth_tag_length_;
packet->payload_length_ = len;
}
u_int8_t* encrypted_packet_get_auth_portion(encrypted_packet_t* packet)
{
if(!packet)
return NULL;
return packet->data_.buf_;
}
u_int32_t encrypted_packet_get_auth_portion_length(encrypted_packet_t* packet)
{
if(!packet)
return 0;
return packet->payload_length_ + sizeof(encrypted_packet_header_t);
}
u_int8_t* encrypted_packet_get_auth_tag(encrypted_packet_t* packet)
{
if(!packet || !packet->auth_tag_length_)
return NULL;
return (packet->data_.buf_ + sizeof(encrypted_packet_header_t) + packet->payload_length_);
}
u_int32_t encrypted_packet_get_auth_tag_length(encrypted_packet_t* packet)
{
if(!packet)
return 0;
return packet->auth_tag_length_;
}
seq_nr_t encrypted_packet_get_seq_nr(encrypted_packet_t* packet)
{
if(!packet)
return 0;
return SEQ_NR_T_NTOH(packet->data_.header_.seq_nr_);
}
void encrypted_packet_set_seq_nr(encrypted_packet_t* packet, seq_nr_t seq_nr)
{
if(!packet)
return;
packet->data_.header_.seq_nr_ = SEQ_NR_T_HTON(seq_nr);
}
sender_id_t encrypted_packet_get_sender_id(encrypted_packet_t* packet)
{
if(!packet)
return 0;
return SENDER_ID_T_NTOH(packet->data_.header_.sender_id_);
}
void encrypted_packet_set_sender_id(encrypted_packet_t* packet, sender_id_t sender_id)
{
if(!packet)
return;
packet->data_.header_.sender_id_ = SENDER_ID_T_HTON(sender_id);
}
mux_t encrypted_packet_get_mux(encrypted_packet_t* packet)
{
if(!packet)
return 0;
return MUX_T_NTOH(packet->data_.header_.mux_);
}
void encrypted_packet_set_mux(encrypted_packet_t* packet, mux_t mux)
{
if(!packet)
return;
packet->data_.header_.mux_ = MUX_T_HTON(mux);
}
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