/usr/include/tins/udp.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_UDP_H
#define TINS_UDP_H
#include "macros.h"
#include "pdu.h"
#include "endianness.h"
namespace Tins {
/** \brief Class that represents an UDP PDU.
*
* UDP is the representation of the UDP PDU. Instances of this class
* must be sent over a level 3 PDU, this will otherwise fail.
*/
class UDP : public PDU {
public:
/**
* \brief This PDU's flag.
*/
static const PDU::PDUType pdu_flag = PDU::UDP;
/**
* \brief UDP constructor.
*
* Creates an instance of UDP. Destination and source port can
* be provided, otherwise both will be 0.
*
* \param dport Destination port.
* \param sport Source port.
* */
UDP(uint16_t dport = 0, uint16_t sport = 0);
/**
* \brief Constructs an UDP object from a buffer.
*
* If there is not enough size for a UDP header a malformed_packet
* exception is thrown.
*
* Any extra data will be stored in a RawPDU.
*
* \param buffer The buffer from which this PDU will be constructed.
* \param total_sz The total size of the buffer.
*/
UDP(const uint8_t *buffer, uint32_t total_sz);
/**
* \brief Getter for the destination port.
* \return The datagram's destination port.
*/
uint16_t dport() const { return Endian::be_to_host(_udp.dport); }
/**
* \brief Getter for the source port.
* \return The datagram's source port.
*/
uint16_t sport() const { return Endian::be_to_host(_udp.sport); }
/**
* \brief Getter for the length of the datagram.
* \return The length of the datagram.
*/
uint16_t length() const { return Endian::be_to_host(_udp.len); }
/**
* \brief Getter for the checksum of the datagram.
* \return The datagram's checksum.
*/
uint16_t checksum() const { return Endian::be_to_host(_udp.check); }
/**
* \brief Set the destination port.
* \param new_dport The new destination port.
*/
void dport(uint16_t new_dport);
/**
* \brief Set the source port.
*
* \param new_sport The new source port.
*/
void sport(uint16_t new_sport);
/**
* \brief Getter for the length field.
* \param new_len The new length field.
* \return The length field.
*/
void length(uint16_t new_len);
/**
* \brief Check wether ptr points to a valid response for this PDU.
*
* This compares the source and destination ports in the provided
* response with those stored in this PDU.
*
* \sa PDU::matches_response
* \param ptr The pointer to the buffer.
* \param total_sz The size of the buffer.
*/
bool matches_response(const uint8_t *ptr, uint32_t total_sz) const;
/**
* \brief Returns the header size.
*
* This metod overrides PDU::header_size. This size includes the
* payload and options 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::UDP; }
/**
* \sa PDU::clone
*/
UDP *clone() const {
return new UDP(*this);
}
private:
TINS_BEGIN_PACK
struct udphdr {
uint16_t sport;
uint16_t dport;
uint16_t len;
uint16_t check;
} TINS_END_PACK;
void write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent);
udphdr _udp;
};
}
#endif // TINS_UDP_H
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