mirror of
https://github.com/mfontanini/libtins
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121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
/*
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* libtins is a net packet wrapper library for crafting and
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* interpreting sniffed packets.
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*
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* Copyright (C) 2011 Nasel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __UDP_H
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#define __UDP_H
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#include "pdu.h"
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namespace Tins {
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/** \brief UDP represents the UDP PDU.
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*
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* UDP is the representation of the UDP PDU. Instances of this class
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* must be sent over a level 3 PDU, this will otherwise fail.
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*/
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class UDP : public PDU {
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public:
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/**
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* \brief UDP constructor.
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*
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* Creates an instance of UDP. Destination and source port can
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* be provided, otherwise both will be 0.
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* \param dport Destination port.
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* \param sport Source port.
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* \param child The child PDU(optional).
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* */
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UDP(uint16_t dport = 0, uint16_t sport = 0, PDU *child = 0);
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/**
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* \brief Constructor which creates an UDP object from a buffer and adds all identifiable
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* PDUs found in the buffer as children of this one.
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* \param buffer The buffer from which this PDU will be constructed.
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* \param total_sz The total size of the buffer.
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*/
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UDP(const uint8_t *buffer, uint32_t total_sz);
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/** \brief Returns the destination port
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*/
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inline uint16_t dport() const { return _udp.dport; }
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/** \brief Returns the source port
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*/
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inline uint16_t sport() const { return _udp.sport; }
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/** \brief Set the destination port.
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*
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* \param new_dport The new destination port.
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*/
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void dport(uint16_t new_dport);
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/** \brief Set the source port.
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*
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* \param new_sport The new source port.
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*/
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void sport(uint16_t new_sport);
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/** \brief Getter for the length field.
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* \param new_len The new length field.
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* \return The length field.
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*/
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void length(uint16_t new_len);
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/** \brief Set the payload.
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*
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* Payload is NOT copied. Therefore, pointers provided as
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* payloads must be freed manually by the user. This actually
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* creates a RawPDU that holds the payload, and sets it as the
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* inner_pdu. Therefore, if an inner_pdu was set previously,
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* a call to UDP::payload will delete it.
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* \param new_payload New payload.
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* \param new_payload_size New payload's size
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*/
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void payload(uint8_t *new_payload, uint32_t new_payload_size);
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/** \brief Returns the header size.
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*
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* This metod overrides PDU::header_size. This size includes the
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* payload and options size. \sa PDU::header_size
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*/
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uint32_t header_size() const;
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/**
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* \brief Getter for the PDU's type.
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* \sa PDU::pdu_type
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*/
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PDUType pdu_type() const { return PDU::UDP; }
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private:
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struct udphdr {
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uint16_t sport;
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uint16_t dport;
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uint16_t len;
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uint16_t check;
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} __attribute__((packed));
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void write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent);
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udphdr _udp;
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};
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};
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#endif
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