udp.h

/*
 * Copyright (c) 2017, 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 <tins/macros.h>
#include <tins/pdu.h>
#include <tins/endianness.h>

namespace Tins {

class TINS_API UDP : public PDU {
public:
    static const PDU::PDUType pdu_flag = PDU::UDP;

    static metadata extract_metadata(const uint8_t *buffer, uint32_t total_sz);

    UDP(uint16_t dport = 0, uint16_t sport = 0);

    UDP(const uint8_t* buffer, uint32_t total_sz);
    
    uint16_t dport() const {
        return Endian::be_to_host(header_.dport);
    }

    uint16_t sport() const {
        return Endian::be_to_host(header_.sport);
    }
    
    uint16_t length() const {
        return Endian::be_to_host(header_.len);
    }
    
    uint16_t checksum() const {
        return Endian::be_to_host(header_.check);
    }

    void dport(uint16_t new_dport);

    void sport(uint16_t new_sport);
    
    void length(uint16_t new_len);

    bool matches_response(const uint8_t* ptr, uint32_t total_sz) const;

    uint32_t header_size() const;
    
    PDUType pdu_type() const { return PDU::UDP; }
    
    UDP* clone() const {
        return new UDP(*this);
    }
private:
    TINS_BEGIN_PACK
    struct udp_header {
        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);

    udp_header header_;
};

} // Tins

#endif // TINS_UDP_H