/usr/include/tins/snap.h is in libtins-dev 1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 2012, Matias Fontanini
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef TINS_SNAP_H
#define TINS_SNAP_H
#include <stdint.h>
#include "pdu.h"
#include "macros.h"
#include "endianness.h"
#include "small_uint.h"
namespace Tins {
/**
* \brief Class representing a SNAP frame.
*
* Note that this PDU contains the 802.3 LLC structure + SNAP frame.
* So far only unnumbered information structure is supported.
*/
class SNAP : public PDU {
public:
/**
* \brief This PDU's flag.
*/
static const PDU::PDUType pdu_flag = PDU::SNAP;
/**
* \brief Creates an instance of SNAP
* This constructor sets the dsap and ssap fields to 0xaa, and
* the id field to 3.
*/
SNAP();
/**
* \brief Constructs a SNAP object from a buffer and adds all
* identifiable PDUs found in the buffer as children of this one.
*
* If the next PDU is not recognized, then a RawPDU is used.
*
* If there is not enough size for a SNAP header in the
* buffer, a malformed_packet exception is thrown.
*
* \param buffer The buffer from which this PDU will be constructed.
* \param total_sz The total size of the buffer.
*/
SNAP(const uint8_t *buffer, uint32_t total_sz);
/* Setters */
/**
* \brief Setter for the control field.
* \param new_id The new control to be set.
*/
void control(uint8_t new_control);
/**
* \brief Setter for the org code field.
* \param new_org The new org code to be set.
*/
void org_code(small_uint<24> new_org);
/**
* \brief Setter for the eth type field.
* \param new_eth The new eth type to be set.
*/
void eth_type(uint16_t new_eth);
/* Getters */
/**
* \brief Getter for the dsap field.
* \return The dsap field.
*/
uint8_t dsap() const { return _snap.dsap; }
/**
* \brief Getter for the ssap field.
* \return The ssap field.
*/
uint8_t ssap() const { return _snap.ssap; }
/**
* \brief Getter for the control field.
* \return The control field.
*/
uint8_t control() const {
#if TINS_IS_LITTLE_ENDIAN
return (_snap.control_org) & 0xff;
#else
return (_snap.control_org >> 24) & 0xff;
#endif
}
/**
* \brief Getter for the org code field.
* \return The org code field.
*/
small_uint<24> org_code() const {
#if TINS_IS_LITTLE_ENDIAN
return Endian::be_to_host<uint32_t>(_snap.control_org & 0xffffff00);
#else
return _snap.control_org & 0xffffff;
#endif
}
/**
* \brief Getter for the eth type field.
* \return The eth field.
*/
uint16_t eth_type() const { return Endian::be_to_host(_snap.eth_type); }
/**
* \brief Returns the SNAP frame's header length.
*
* \return The header's size.
* \sa PDU::header_size()
*/
uint32_t header_size() const;
/**
* \brief Getter for the PDU's type.
* \sa PDU::pdu_type
*/
PDUType pdu_type() const { return PDU::SNAP; }
/**
* \brief Clones this PDU.
*
* \sa PDU::clone
*/
SNAP *clone() const {
return new SNAP(*this);
}
private:
TINS_BEGIN_PACK
struct snaphdr {
uint8_t dsap;
uint8_t ssap;
uint32_t control_org;
uint16_t eth_type;
} TINS_END_PACK;
void write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent);
snaphdr _snap;
};
}
#endif // TINS_SNAP_H
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