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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) 2007-2017 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/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#include "datatypes.h"
#include "plain_packet.h"
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
void plain_packet_init(plain_packet_t* packet)
{
if(!packet)
return;
memset (packet, 0, sizeof(*packet));
}
u_int32_t plain_packet_get_header_length()
{
return sizeof(payload_type_t);
}
u_int8_t* plain_packet_get_packet(plain_packet_t* packet)
{
if(!packet)
return NULL;
return packet->data_.buf_;
}
u_int32_t plain_packet_get_length(plain_packet_t* packet)
{
if(!packet)
return 0;
return (packet->payload_length_ + sizeof(payload_type_t));
}
void plain_packet_set_length(plain_packet_t* packet, u_int32_t len)
{
if(!packet)
return;
if(len > PLAIN_PACKET_SIZE_MAX)
len = PLAIN_PACKET_SIZE_MAX - sizeof(payload_type_t);
else if(len < sizeof(payload_type_t))
len = 0;
else
len -= sizeof(payload_type_t);
packet->payload_length_ = len;
}
u_int8_t* plain_packet_get_payload(plain_packet_t* packet)
{
if(!packet || !packet->payload_length_)
return NULL;
return (packet->data_.buf_ + sizeof(payload_type_t));
}
u_int32_t plain_packet_get_payload_length(plain_packet_t* packet)
{
if(!packet)
return 0;
return packet->payload_length_;
}
void plain_packet_set_payload_length(plain_packet_t* packet, u_int32_t len)
{
if(!packet)
return;
if(len > PLAIN_PACKET_SIZE_MAX || (len + sizeof(payload_type_t)) > PLAIN_PACKET_SIZE_MAX)
len = PLAIN_PACKET_SIZE_MAX - sizeof(payload_type_t);
packet->payload_length_ = len;
}
payload_type_t plain_packet_get_type(plain_packet_t* packet)
{
if(!packet)
return 0;
return PAYLOAD_TYPE_T_NTOH(packet->data_.payload_type_);
}
void plain_packet_set_type(plain_packet_t* packet, payload_type_t type)
{
if(!packet)
return;
if(type == PAYLOAD_TYPE_TUN) {
if(!packet->payload_length_) {
packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN);
return;
}
struct ip* hdr = (struct ip*)(packet->data_.buf_ + sizeof(payload_type_t));
if(hdr->ip_v == 4)
packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN4);
else if(hdr->ip_v == 6)
packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN6);
}
else
packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(type);
}
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