/usr/include/libknot/packet/wire.h is in libknot-dev 2.1.1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*!
* \file
*
* \brief Functions for manipulating and parsing raw data in DNS packets.
*
* \addtogroup libknot
* @{
*/
#pragma once
#include <stdint.h>
#include <stdlib.h>
#include "libknot/attribute.h"
/*! \brief Offset of DNS header fields in wireformat. */
enum knot_wire_offsets {
KNOT_WIRE_OFFSET_ID = 0,
KNOT_WIRE_OFFSET_FLAGS1 = 2,
KNOT_WIRE_OFFSET_FLAGS2 = 3,
KNOT_WIRE_OFFSET_QDCOUNT = 4,
KNOT_WIRE_OFFSET_ANCOUNT = 6,
KNOT_WIRE_OFFSET_NSCOUNT = 8,
KNOT_WIRE_OFFSET_ARCOUNT = 10
};
/*! \brief Minimum size for some parts of the DNS packet. */
enum knot_wire_sizes {
KNOT_WIRE_HEADER_SIZE = 12,
KNOT_WIRE_QUESTION_MIN_SIZE = 5,
KNOT_WIRE_RR_MIN_SIZE = 11,
KNOT_WIRE_MIN_PKTSIZE = 512,
KNOT_WIRE_MAX_PKTSIZE = 65535,
KNOT_WIRE_MAX_PAYLOAD = KNOT_WIRE_MAX_PKTSIZE
- KNOT_WIRE_HEADER_SIZE
- KNOT_WIRE_QUESTION_MIN_SIZE
};
/*
* Packet header manipulation functions.
*/
/*!
* \brief Returns the ID from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return DNS packet ID.
*/
uint16_t knot_wire_get_id(const uint8_t *packet);
/*!
* \brief Sets the ID to the wire format of the packet.
*
* \param packet Wire format of the packet.
* \param id DNS packet ID.
*/
void knot_wire_set_id(uint8_t *packet, uint16_t id);
/*!
* \brief Returns the first byte of flags from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return First byte of DNS flags.
*/
static inline uint8_t knot_wire_get_flags1(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS1);
}
/*!
* \brief Sets the first byte of flags to the wire format of the packet.
*
* \param packet Wire format of the packet.
* \param flags1 First byte of the DNS flags.
*/
static inline uint8_t knot_wire_set_flags1(uint8_t *packet, uint8_t flags1)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS1) = flags1;
}
/*!
* \brief Returns the second byte of flags from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return Second byte of DNS flags.
*/
static inline uint8_t knot_wire_get_flags2(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS2);
}
/*!
* \brief Sets the second byte of flags to the wire format of the packet.
*
* \param packet Wire format of the packet.
* \param flags2 Second byte of the DNS flags.
*/
static inline uint8_t knot_wire_set_flags2(uint8_t *packet, uint8_t flags2)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS2) = flags2;
}
/*!
* \brief Returns the QDCOUNT (count of Question entries) from wire format of
* the packet.
*
* \param packet Wire format of the packet.
*
* \return QDCOUNT (count of Question entries in the packet).
*/
uint16_t knot_wire_get_qdcount(const uint8_t *packet);
/*!
* \brief Sets the QDCOUNT (count of Question entries) to wire format of the
* packet.
*
* \param packet Wire format of the packet.
* \param qdcount QDCOUNT (count of Question entries in the packet).
*/
void knot_wire_set_qdcount(uint8_t *packet, uint16_t qdcount);
/*!
* \brief Adds to QDCOUNT.
*/
void knot_wire_add_qdcount(uint8_t *packet, int16_t n);
/*!
* \brief Returns the ANCOUNT (count of Answer entries) from wire format of
* the packet.
*
* \param packet Wire format of the packet.
*
* \return ANCOUNT (count of Answer entries in the packet).
*/
uint16_t knot_wire_get_ancount(const uint8_t *packet);
/*!
* \brief Sets the ANCOUNT (count of Answer entries) to wire format of the
* packet.
*
* \param packet Wire format of the packet.
* \param ancount ANCOUNT (count of Answer entries in the packet).
*/
void knot_wire_set_ancount(uint8_t *packet, uint16_t ancount);
/*!
* \brief Adds to ANCOUNT.
*/
void knot_wire_add_ancount(uint8_t *packet, int16_t n);
/*!
* \brief Returns the NSCOUNT (count of Authority entries) from wire format of
* the packet.
*
* \param packet Wire format of the packet.
*
* \return NSCOUNT (count of Authority entries in the packet).
*/
uint16_t knot_wire_get_nscount(const uint8_t *packet);
/*!
* \brief Sets the NSCOUNT (count of Authority entries) to wire format of the
* packet.
*
* \param packet Wire format of the packet.
* \param nscount NSCOUNT (count of Authority entries in the packet).
*/
void knot_wire_set_nscount(uint8_t *packet, uint16_t nscount);
/*!
* \brief Adds to NSCOUNT.
*/
void knot_wire_add_nscount(uint8_t *packet, int16_t n);
/*!
* \brief Returns the ARCOUNT (count of Additional entries) from wire format of
* the packet.
*
* \param packet Wire format of the packet.
*
* \return ARCOUNT (count of Additional entries in the packet).
*/
uint16_t knot_wire_get_arcount(const uint8_t *packet);
/*!
* \brief Sets the ARCOUNT (count of Additional entries) to wire format of the
* packet.
*
* \param packet Wire format of the packet.
* \param arcount ARCOUNT (count of Additional entries in the packet).
*/
void knot_wire_set_arcount(uint8_t *packet, uint16_t arcount);
/*!
* \brief Adds to ARCOUNT.
*/
void knot_wire_add_arcount(uint8_t *packet, int16_t n);
/*
* Packet header flags manipulation functions.
*/
/*! \brief Constants for DNS header flags in the first flags byte. */
enum knot_wire_flags1_consts {
KNOT_WIRE_RD_MASK = (uint8_t)0x01U, /*!< RD bit mask. */
KNOT_WIRE_RD_SHIFT = 0, /*!< RD bit shift. */
KNOT_WIRE_TC_MASK = (uint8_t)0x02U, /*!< TC bit mask. */
KNOT_WIRE_TC_SHIFT = 1, /*!< TC bit shift. */
KNOT_WIRE_AA_MASK = (uint8_t)0x04U, /*!< AA bit mask. */
KNOT_WIRE_AA_SHIFT = 2, /*!< AA bit shift. */
KNOT_WIRE_OPCODE_MASK = (uint8_t)0x78U, /*!< OPCODE mask. */
KNOT_WIRE_OPCODE_SHIFT = 3, /*!< OPCODE shift. */
KNOT_WIRE_QR_MASK = (uint8_t)0x80U, /*!< QR bit mask. */
KNOT_WIRE_QR_SHIFT = 7 /*!< QR bit shift. */
};
/*! \brief Constants for DNS header flags in the second flags byte. */
enum knot_wire_flags2_consts {
KNOT_WIRE_RCODE_MASK = (uint8_t)0x0fU, /*!< RCODE mask. */
KNOT_WIRE_RCODE_SHIFT = 0, /*!< RCODE shift. */
KNOT_WIRE_CD_MASK = (uint8_t)0x10U, /*!< CD bit mask. */
KNOT_WIRE_CD_SHIFT = 4, /*!< CD bit shift. */
KNOT_WIRE_AD_MASK = (uint8_t)0x20U, /*!< AD bit mask. */
KNOT_WIRE_AD_SHIFT = 5, /*!< AD bit shift. */
KNOT_WIRE_Z_MASK = (uint8_t)0x40U, /*!< Zero bit mask. */
KNOT_WIRE_Z_SHIFT = 6, /*!< Zero bit shift. */
KNOT_WIRE_RA_MASK = (uint8_t)0x80U, /*!< RA bit mask. */
KNOT_WIRE_RA_SHIFT = 7 /*!< RA bit shift. */
};
/*
* Functions for getting / setting / clearing flags and codes directly in packet
*/
/*!
* \brief Returns the RD bit from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return Flags with only the RD bit according to its setting in the packet.
*/
static inline uint8_t knot_wire_get_rd(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS1) & KNOT_WIRE_RD_MASK;
}
/*!
* \brief Sets the RD bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_set_rd(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS1) |= KNOT_WIRE_RD_MASK;
}
/*!
* \brief Clears the RD bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_flags_clear_rd(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS1) &= ~KNOT_WIRE_RD_MASK;
}
/*!
* \brief Returns the TC bit from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return Flags with only the TC bit according to its setting in the packet.
*/
static inline uint8_t knot_wire_get_tc(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS1) & KNOT_WIRE_TC_MASK;
}
/*!
* \brief Sets the TC bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_set_tc(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS1) |= KNOT_WIRE_TC_MASK;
}
/*!
* \brief Clears the TC bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_clear_tc(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS1) &= ~KNOT_WIRE_TC_MASK;
}
/*!
* \brief Returns the AA bit from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return Flags with only the AA bit according to its setting in the packet.
*/
static inline uint8_t knot_wire_get_aa(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS1) & KNOT_WIRE_AA_MASK;
}
/*!
* \brief Sets the AA bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_set_aa(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS1) |= KNOT_WIRE_AA_MASK;
}
/*!
* \brief Clears the AA bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_clear_aa(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS1) &= ~KNOT_WIRE_AA_MASK;
}
/*!
* \brief Returns the OPCODE from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return OPCODE of the packet.
*/
static inline uint8_t knot_wire_get_opcode(const uint8_t *packet)
{
return (*(packet + KNOT_WIRE_OFFSET_FLAGS1)
& KNOT_WIRE_OPCODE_MASK) >> KNOT_WIRE_OPCODE_SHIFT;
}
/*!
* \brief Sets the OPCODE in the wire format of the packet.
*
* \param packet Wire format of the packet.
* \param opcode OPCODE to set.
*/
static inline void knot_wire_set_opcode(uint8_t *packet, short opcode)
{
uint8_t *flags1 = packet + KNOT_WIRE_OFFSET_FLAGS1;
*flags1 = (*flags1 & ~KNOT_WIRE_OPCODE_MASK)
| ((opcode) << KNOT_WIRE_OPCODE_SHIFT);
}
/*!
* \brief Returns the QR bit from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return Flags with only the QR bit according to its setting in the packet.
*/
static inline uint8_t knot_wire_get_qr(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS1) & KNOT_WIRE_QR_MASK;
}
/*!
* \brief Sets the QR bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_set_qr(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS1) |= KNOT_WIRE_QR_MASK;
}
/*!
* \brief Clears the QR bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_clear_qr(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS1) &= ~KNOT_WIRE_QR_MASK;
}
/*!
* \brief Returns the RCODE from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return RCODE of the packet.
*/
static inline uint8_t knot_wire_get_rcode(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS2)
& KNOT_WIRE_RCODE_MASK;
}
/*!
* \brief Sets the RCODE in the wire format of the packet.
*
* \param packet Wire format of the packet.
* \param rcode RCODE to set.
*/
static inline void knot_wire_set_rcode(uint8_t *packet, short rcode)
{
uint8_t *flags2 = packet + KNOT_WIRE_OFFSET_FLAGS2;
*flags2 = (*flags2 & ~KNOT_WIRE_RCODE_MASK) | (rcode);
}
/*!
* \brief Returns the CD bit from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return Flags with only the CD bit according to its setting in the packet.
*/
static inline uint8_t knot_wire_get_cd(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS2) & KNOT_WIRE_CD_MASK;
}
/*!
* \brief Sets the CD bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_set_cd(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS2) |= KNOT_WIRE_CD_MASK;
}
/*!
* \brief Clears the CD bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_clear_cd(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS2) &= ~KNOT_WIRE_CD_MASK;
}
/*!
* \brief Returns the AD bit from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return Flags with only the AD bit according to its setting in the packet.
*/
static inline uint8_t knot_wire_get_ad(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS2) & KNOT_WIRE_AD_MASK;
}
/*!
* \brief Sets the AD bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_set_ad(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS2) |= KNOT_WIRE_AD_MASK;
}
/*!
* \brief Clears the AD bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_clear_ad(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS2) &= ~KNOT_WIRE_AD_MASK;
}
/*!
* \brief Returns the Zero bit from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return Flags with only the Zero bit according to its setting in the packet.
*/
static inline uint8_t knot_wire_get_z(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS2) & KNOT_WIRE_Z_MASK;
}
/*!
* \brief Sets the Zero bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_set_z(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS2) |= KNOT_WIRE_Z_MASK;
}
/*!
* \brief Clears the Zero bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_clear_z(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS2) &= ~KNOT_WIRE_Z_MASK;
}
/*!
* \brief Returns the RA bit from wire format of the packet.
*
* \param packet Wire format of the packet.
*
* \return Flags with only the RA bit according to its setting in the packet.
*/
static inline uint8_t knot_wire_get_ra(const uint8_t *packet)
{
return *(packet + KNOT_WIRE_OFFSET_FLAGS2) & KNOT_WIRE_RA_MASK;
}
/*!
* \brief Sets the RA bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_set_ra(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS2) |= KNOT_WIRE_RA_MASK;
}
/*!
* \brief Clears the RA bit in the wire format of the packet.
*
* \param packet Wire format of the packet.
*/
static inline void knot_wire_clear_ra(uint8_t *packet)
{
*(packet + KNOT_WIRE_OFFSET_FLAGS2) &= ~KNOT_WIRE_RA_MASK;
}
/*
* Functions for getting / setting / clearing flags in flags variable
*/
/*!
* \brief Returns the RD bit from the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*
* \return Flags byte with only the RD bit according to its setting in
* \a flags1.
*/
static inline uint8_t knot_wire_flags_get_rd(uint8_t flags1)
{
return flags1 & KNOT_WIRE_RD_MASK;
}
/*!
* \brief Sets the RD bit in the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*/
static inline void knot_wire_flags_set_rd(uint8_t *flags1)
{
*flags1 |= KNOT_WIRE_RD_MASK;
}
/*!
* \brief Clears the RD bit in the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*/
static inline void knot_wire_flags_flags_clear_rd(uint8_t *flags1)
{
*flags1 &= ~KNOT_WIRE_RD_MASK;
}
/*!
* \brief Returns the TC bit from the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*
* \return Flags byte with only the TC bit according to its setting in
* \a flags1.
*/
static inline uint8_t knot_wire_flags_get_tc(uint8_t flags1)
{
return flags1 & KNOT_WIRE_TC_MASK;
}
/*!
* \brief Sets the TC bit in the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*/
static inline void knot_wire_flags_set_tc(uint8_t *flags1)
{
*flags1 |= KNOT_WIRE_TC_MASK;
}
/*!
* \brief Clears the TC bit in the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*/
static inline void knot_wire_flags_clear_tc(uint8_t *flags1)
{
*flags1 &= ~KNOT_WIRE_TC_MASK;
}
/*!
* \brief Returns the AA bit from the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*
* \return Flags byte with only the AA bit according to its setting in
* \a flags1.
*/
static inline uint8_t knot_wire_flags_get_aa(uint8_t flags1)
{
return flags1 & KNOT_WIRE_AA_MASK;
}
/*!
* \brief Sets the AA bit in the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*/
static inline void knot_wire_flags_set_aa(uint8_t *flags1)
{
*flags1 |= KNOT_WIRE_AA_MASK;
}
/*!
* \brief Clears the AA bit in the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*/
static inline void knot_wire_flags_clear_aa(uint8_t *flags1)
{
*flags1 &= ~KNOT_WIRE_AA_MASK;
}
/*!
* \brief Returns the OPCODE from the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*
* \return OPCODE
*/
static inline uint8_t knot_wire_flags_get_opcode(uint8_t flags1)
{
return (flags1 & KNOT_WIRE_OPCODE_MASK)
>> KNOT_WIRE_OPCODE_SHIFT;
}
/*!
* \brief Sets the OPCODE in the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
* \param opcode OPCODE to set.
*/
static inline void knot_wire_flags_set_opcode(uint8_t *flags1, short opcode)
{
*flags1 = (*flags1 & ~KNOT_WIRE_OPCODE_MASK)
| ((opcode) << KNOT_WIRE_OPCODE_SHIFT);
}
/*!
* \brief Returns the QR bit from the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*
* \return Flags byte with only the QR bit according to its setting in
* \a flags1.
*/
static inline uint8_t knot_wire_flags_get_qr(uint8_t flags1)
{
return flags1 & KNOT_WIRE_QR_MASK;
}
/*!
* \brief Sets the QR bit in the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*/
static inline void knot_wire_flags_set_qr(uint8_t *flags1)
{
*flags1 |= KNOT_WIRE_QR_MASK;
}
/*!
* \brief Clears the QR bit in the first byte of flags.
*
* \param flags1 First byte of DNS header flags.
*/
static inline void knot_wire_flags_clear_qr(uint8_t *flags1)
{
*flags1 &= ~KNOT_WIRE_QR_MASK;
}
/*!
* \brief Returns the RCODE from the second byte of flags.
*
* \param flags2 First byte of DNS header flags.
*
* \return RCODE
*/
static inline uint8_t knot_wire_flags_get_rcode(uint8_t flags2)
{
return flags2 & KNOT_WIRE_RCODE_MASK;
}
/*!
* \brief Sets the RCODE in the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
* \param rcode RCODE to set.
*/
static inline void knot_wire_flags_set_rcode(uint8_t *flags2, short rcode)
{
*flags2 = (*flags2 & ~KNOT_WIRE_RCODE_MASK) | (rcode);
}
/*!
* \brief Returns the CD bit from the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*
* \return Flags byte with only the CD bit according to its setting in
* \a flags2.
*/
static inline uint8_t knot_wire_flags_get_cd(uint8_t flags2)
{
return flags2 & KNOT_WIRE_CD_MASK;
}
/*!
* \brief Sets the CD bit in the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*/
static inline void knot_wire_flags_set_cd(uint8_t *flags2)
{
*flags2 |= KNOT_WIRE_CD_MASK;
}
/*!
* \brief Clears the CD bit in the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*/
static inline void knot_wire_flags_clear_cd(uint8_t *flags2)
{
*flags2 &= ~KNOT_WIRE_CD_MASK;
}
/*!
* \brief Returns the AD bit from the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*
* \return Flags byte with only the AD bit according to its setting in
* \a flags2.
*/
static inline uint8_t knot_wire_flags_get_ad(uint8_t flags2)
{
return flags2 & KNOT_WIRE_AD_MASK;
}
/*!
* \brief Sets the AD bit in the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*/
static inline void knot_wire_flags_set_ad(uint8_t *flags2)
{
*flags2 |= KNOT_WIRE_AD_MASK;
}
/*!
* \brief Clears the AD bit in the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*/
static inline void knot_wire_flags_clear_ad(uint8_t *flags2)
{
*flags2 &= ~KNOT_WIRE_AD_MASK;
}
/*!
* \brief Returns the Zero bit from the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*
* \return Flags byte with only the Zero bit according to its setting in
* \a flags2.
*/
static inline uint8_t knot_wire_flags_get_z(uint8_t flags2)
{
return flags2 & KNOT_WIRE_Z_MASK;
}
/*!
* \brief Sets the Zero bit in the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*/
static inline void knot_wire_flags_set_z(uint8_t *flags2)
{
*flags2 |= KNOT_WIRE_Z_MASK;
}
/*!
* \brief Clears the Zero bit in the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*/
static inline void knot_wire_flags_clear_z(uint8_t *flags2)
{
*flags2 &= ~KNOT_WIRE_Z_MASK;
}
/*!
* \brief Returns the RA bit from the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*
* \return Flags byte with only the RA bit according to its setting in
* \a flags2.
*/
static inline uint8_t knot_wire_flags_get_ra(uint8_t flags2)
{
return flags2 & KNOT_WIRE_RA_MASK;
}
/*!
* \brief Sets the RA bit in the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*/
static inline void knot_wire_flags_set_ra(uint8_t *flags2)
{
*flags2 |= KNOT_WIRE_RA_MASK;
}
/*!
* \brief Clears the RA bit in the second byte of flags.
*
* \param flags2 Second byte of DNS header flags.
*/
static inline void knot_wire_flags_clear_ra(uint8_t *flags2)
{
*flags2 &= ~KNOT_WIRE_RA_MASK;
}
/*
* Pointer manipulation
*/
enum knot_wire_pointer_consts {
/*! \brief DNS packet pointer designation (first two bits set to 1). */
KNOT_WIRE_PTR = (uint8_t)0xC0,
/*! \brief DNS packet minimal pointer (KNOT_WIRE_PTR + 1 zero byte). */
KNOT_WIRE_PTR_BASE = (uint16_t)0xC000,
/*! \brief DNS packet maximal offset (KNOT_WIRE_BASE complement). */
KNOT_WIRE_PTR_MAX = (uint16_t)0x3FFF
};
/*!
* \brief Creates a DNS packet pointer and stores it in wire format.
*
* \param pos Position where tu put the pointer.
* \param ptr Relative position of the item to which the pointer should point in
* the wire format of the packet.
*/
void knot_wire_put_pointer(uint8_t *pos, uint16_t ptr);
uint16_t knot_wire_get_pointer(const uint8_t *pos);
static inline int knot_wire_is_pointer(const uint8_t *pos)
{
return pos && ((pos[0] & KNOT_WIRE_PTR) == KNOT_WIRE_PTR);
}
_pure_ _mustcheck_
static inline const uint8_t *knot_wire_seek_label(const uint8_t *lp, const uint8_t *wire)
{
while (knot_wire_is_pointer(lp)) {
if (!wire)
return NULL;
lp = wire + knot_wire_get_pointer(lp);
}
return lp;
}
_pure_ _mustcheck_
static inline const uint8_t *knot_wire_next_label(const uint8_t *lp, const uint8_t *wire)
{
if (!lp || !lp[0]) /* No label after final label. */
return NULL;
return knot_wire_seek_label(lp + (lp[0] + sizeof(uint8_t)), wire);
}
/*! @} */
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