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libtins/include/icmp.h
Matias Fontanini 4d8fb5a4e5 Modified IP, ARP, ICMP and EthernetII's clone_packet.
2011-09-15 09:17:35 -03:00

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/*
* libtins is a net packet wrapper library for crafting and
* interpreting sniffed packets.
*
* Copyright (C) 2011 Nasel
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __ICMP_H
#define __ICMP_H
#include "pdu.h"
#include "utils.h"
namespace Tins {
/** \brief Class that represents an ICMP PDU.
*
* ICMP is the representation of the ICMP PDU. Instances of this class
* must be sent over a level 3 PDU, this will otherwise fail.
*/
class ICMP : public PDU {
public:
/** \brief ICMP flags
*/
enum Flags {
ECHO_REPLY = 0,
DEST_UNREACHABLE = 3,
SOURCE_QUENCH = 4,
REDIRECT = 5,
ECHO_REQUEST = 8,
TIME_EXCEEDED = 11,
PARAM_PROBLEM = 12,
INFO_REQUEST = 15,
INFO_REPLY = 16
};
/**
* \brief Creates an instance of ICMP.
*
* If no flag is specified, then ECHO_REPLY will be used.
* \param flag The type flag which will be set.
*/
ICMP(Flags flag = ECHO_REQUEST);
/**
* \brief Constructor which creates an ICMP object from a buffer and adds all identifiable
* PDUs found in the buffer as children of this one.
* \param buffer The buffer from which this PDU will be constructed.
* \param total_sz The total size of the buffer.
*/
ICMP(const uint8_t *buffer, uint32_t total_sz);
/**
* \brief Sets the code field.
*
* \param new_code The code which will be stored in the ICMP struct.
*/
void code(uint8_t new_code);
/** \brief Sets the type field.
*
* \param type The type which will be stored in the ICMP struct.
*/
void type(Flags type);
/**
* \brief Setter for checksum field.
*
* \param new_check uint16_t with the new checksum.
*/
void check(uint16_t new_check);
/**
* \brief Setter for the id field.
*
* \param new_id uint16_t with the new id.
*/
void id(uint16_t new_id);
/**
* \brief Setter for the sequence field.
*
* \param new_seq uint16_t with the new sequence.
*/
void sequence(uint16_t new_seq);
/**
* \brief Setter for the gateway field.
*
* \param new_gw uint32_t with the new gateway.
*/
void gateway(uint32_t new_gw);
/**
* \brief Setter for the mtu field.
*
* \param new_mtu uint16_t with the new sequence.
*/
void mtu(uint16_t new_mtu);
/**
* \brief Sets echo request flag for this PDU.
*
* \param id The identifier for this request.
* \param seq The sequence number for this request.
*/
void set_echo_request(uint16_t id, uint16_t seq);
/**
* \brief Sets echo request flag for this PDU.
*
* This uses a global id and sequence number to fill the request's
* fields.
*/
void set_echo_request();
/**
* \brief Sets echo reply flag for this PDU.
*
* \param id The identifier for this request.
* \param seq The sequence number for this request.
*/
void set_echo_reply(uint16_t id, uint16_t seq);
/**
* \brief Sets echo reply flag for this PDU.
*
* This uses a global id and sequence number to fill the request's
* fields.
*/
void set_echo_reply();
/**
* \brief Sets information request flag for this PDU.
*
* \param id The identifier for this request.
* \param seq The sequence number for this request.
*/
void set_info_request(uint16_t id, uint16_t seq);
/**
* \brief Sets information reply flag for this PDU.
*
* \param id The identifier for this request.
* \param seq The sequence number for this request.
*/
void set_info_reply(uint16_t id, uint16_t seq);
/**
* \brief Sets destination unreachable for this PDU.
*/
void set_dest_unreachable();
/**
* \brief Sets time exceeded flag for this PDU.
*
* \param ttl_exceeded If true this PDU will represent a ICMP ttl
* exceeded, otherwise it will represent a fragment reassembly
* time exceeded.
*/
void set_time_exceeded(bool ttl_exceeded = true);
/**
* \brief Sets parameter problem flag for this PDU.
*
* \param set_pointer Indicates wether a pointer to the bad octet
* is provided.
* \param bad_octet Identifies the octet in which the error was
* detected. If set_pointer == false, it is ignored.
*/
void set_param_problem(bool set_pointer = false, uint8_t bad_octet = 0);
/**
* \brief Sets source quench flag for this PDU.
*/
void set_source_quench();
/**
* \brief Sets redirect flag for this PDU.
*
* \param icode The code to be set.
* \param address Address of the gateway to which traffic should
* be sent.
*/
void set_redirect(uint8_t icode, uint32_t address);
/**
* \brief Getter for the ICMP type flag.
*
* \return The type flag for this ICMP PDU.
*/
Flags type() const { return (Flags)_icmp.type; }
/**
* \brief Getter for the ICMP code flag.
*
* \return The code flag for this ICMP PDU.
*/
uint8_t code() const { return _icmp.code; }
/**
* \brief Getter for the checksum field.
*
* \return Returns the checksum as an unit16_t.
*/
uint16_t check() const { return Utils::net_to_host_s(this->_icmp.check); }
/**
* \brief Getter for the echo id.
*
* \return Returns the echo id.
*/
uint16_t id() const { return Utils::net_to_host_s(_icmp.un.echo.id); }
/**
* \brief Getter for the echo sequence number.
*
* \return Returns the echo sequence number.
*/
uint16_t sequence() const { return Utils::net_to_host_s(_icmp.un.echo.sequence); }
/**
* \brief Getter for the gateway field.
*
* \return Returns the gateways in an unit32_t.
*/
uint32_t gateway() const { return Utils::net_to_host_l(this->_icmp.un.gateway); }
/**
* \brief Getter for the mtu field.
*
* \return Returns the mtu value in an uint16_t.
*/
uint16_t mtu() const { return Utils::net_to_host_s(this->_icmp.un.frag.mtu); }
/**
* \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 Check wether ptr points to a valid response for this PDU.
*
* \sa PDU::matches_response
* \param ptr The pointer to the buffer.
* \param total_sz The size of the buffer.
*/
bool matches_response(uint8_t *ptr, uint32_t total_sz);
/**
* \brief Getter for the PDU's type.
*
* \sa PDU::pdu_type
*/
PDUType pdu_type() const { return PDU::ICMP; }
/**
* \brief Clones this pdu, filling the corresponding header with data
* extracted from a buffer.
*
* \param ptr The pointer to the from from which the data will be extracted.
* \param total_sz The size of the buffer.
* \return The cloned PDU.
* \sa PDU::clone_packet
*/
PDU *clone_packet(const uint8_t *ptr, uint32_t total_sz);
/**
* \brief Clones this PDU.
*
* \sa PDU::clone_pdu
*/
PDU *clone_pdu() const;
private:
static uint16_t global_id, global_seq;
struct icmphdr {
uint8_t type;
uint8_t code;
uint16_t check;
union {
struct {
uint16_t id;
uint16_t sequence;
} echo;
uint32_t gateway;
struct {
uint16_t __unused;
uint16_t mtu;
} frag;
} un;
} __attribute__((__packed__));
void copy_fields(const ICMP *other);
/** \brief Serialices this ICMP PDU.
* \param buffer The buffer in which the PDU will be serialized.
* \param total_sz The size available in the buffer.
* \param parent The PDU that's one level below this one on the stack.
*/
void write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent);
icmphdr _icmp;
};
};
#endif
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