198 lines
7.1 KiB
C
198 lines
7.1 KiB
C
/*
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* wire2host.h - from wire conversion routines
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*
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* a Net::DNS like library for C
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*
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* (c) NLnet Labs, 2005-2006
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*
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* See the file LICENSE for the license
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*/
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/**
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* \file
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*
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* Contains functions that translate dns data from the wire format (as sent
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* by servers and clients) to the internal structures.
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*/
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#ifndef LDNS_WIRE2HOST_H
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#define LDNS_WIRE2HOST_H
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#include <ldns/rdata.h>
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#include <ldns/common.h>
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#include <ldns/error.h>
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#include <ldns/rr.h>
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#include <ldns/packet.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* The length of the header */
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#define LDNS_HEADER_SIZE 12
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/* First octet of flags */
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#define LDNS_RD_MASK 0x01U
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#define LDNS_RD_SHIFT 0
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#define LDNS_RD_WIRE(wirebuf) (*(wirebuf+2) & LDNS_RD_MASK)
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#define LDNS_RD_SET(wirebuf) (*(wirebuf+2) |= LDNS_RD_MASK)
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#define LDNS_RD_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_RD_MASK)
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#define LDNS_TC_MASK 0x02U
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#define LDNS_TC_SHIFT 1
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#define LDNS_TC_WIRE(wirebuf) (*(wirebuf+2) & LDNS_TC_MASK)
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#define LDNS_TC_SET(wirebuf) (*(wirebuf+2) |= LDNS_TC_MASK)
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#define LDNS_TC_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_TC_MASK)
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#define LDNS_AA_MASK 0x04U
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#define LDNS_AA_SHIFT 2
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#define LDNS_AA_WIRE(wirebuf) (*(wirebuf+2) & LDNS_AA_MASK)
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#define LDNS_AA_SET(wirebuf) (*(wirebuf+2) |= LDNS_AA_MASK)
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#define LDNS_AA_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_AA_MASK)
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#define LDNS_OPCODE_MASK 0x78U
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#define LDNS_OPCODE_SHIFT 3
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#define LDNS_OPCODE_WIRE(wirebuf) ((*(wirebuf+2) & LDNS_OPCODE_MASK) >> LDNS_OPCODE_SHIFT)
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#define LDNS_OPCODE_SET(wirebuf, opcode) \
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(*(wirebuf+2) = ((*(wirebuf+2)) & ~LDNS_OPCODE_MASK) | ((opcode) << LDNS_OPCODE_SHIFT))
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#define LDNS_QR_MASK 0x80U
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#define LDNS_QR_SHIFT 7
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#define LDNS_QR_WIRE(wirebuf) (*(wirebuf+2) & LDNS_QR_MASK)
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#define LDNS_QR_SET(wirebuf) (*(wirebuf+2) |= LDNS_QR_MASK)
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#define LDNS_QR_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_QR_MASK)
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/* Second octet of flags */
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#define LDNS_RCODE_MASK 0x0fU
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#define LDNS_RCODE_SHIFT 0
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#define LDNS_RCODE_WIRE(wirebuf) (*(wirebuf+3) & LDNS_RCODE_MASK)
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#define LDNS_RCODE_SET(wirebuf, rcode) \
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(*(wirebuf+3) = ((*(wirebuf+3)) & ~LDNS_RCODE_MASK) | (rcode))
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#define LDNS_CD_MASK 0x10U
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#define LDNS_CD_SHIFT 4
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#define LDNS_CD_WIRE(wirebuf) (*(wirebuf+3) & LDNS_CD_MASK)
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#define LDNS_CD_SET(wirebuf) (*(wirebuf+3) |= LDNS_CD_MASK)
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#define LDNS_CD_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_CD_MASK)
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#define LDNS_AD_MASK 0x20U
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#define LDNS_AD_SHIFT 5
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#define LDNS_AD_WIRE(wirebuf) (*(wirebuf+3) & LDNS_AD_MASK)
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#define LDNS_AD_SET(wirebuf) (*(wirebuf+3) |= LDNS_AD_MASK)
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#define LDNS_AD_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_AD_MASK)
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#define LDNS_Z_MASK 0x40U
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#define LDNS_Z_SHIFT 6
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#define LDNS_Z_WIRE(wirebuf) (*(wirebuf+3) & LDNS_Z_MASK)
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#define LDNS_Z_SET(wirebuf) (*(wirebuf+3) |= LDNS_Z_MASK)
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#define LDNS_Z_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_Z_MASK)
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#define LDNS_RA_MASK 0x80U
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#define LDNS_RA_SHIFT 7
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#define LDNS_RA_WIRE(wirebuf) (*(wirebuf+3) & LDNS_RA_MASK)
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#define LDNS_RA_SET(wirebuf) (*(wirebuf+3) |= LDNS_RA_MASK)
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#define LDNS_RA_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_RA_MASK)
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/* Query ID */
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#define LDNS_ID_WIRE(wirebuf) (ldns_read_uint16(wirebuf))
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#define LDNS_ID_SET(wirebuf, id) (ldns_write_uint16(wirebuf, id))
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/* Counter of the question section */
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#define LDNS_QDCOUNT_OFF 4
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/*
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#define QDCOUNT(wirebuf) (ntohs(*(uint16_t *)(wirebuf+QDCOUNT_OFF)))
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*/
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#define LDNS_QDCOUNT(wirebuf) (ldns_read_uint16(wirebuf+LDNS_QDCOUNT_OFF))
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/* Counter of the answer section */
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#define LDNS_ANCOUNT_OFF 6
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#define LDNS_ANCOUNT(wirebuf) (ldns_read_uint16(wirebuf+LDNS_ANCOUNT_OFF))
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/* Counter of the authority section */
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#define LDNS_NSCOUNT_OFF 8
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#define LDNS_NSCOUNT(wirebuf) (ldns_read_uint16(wirebuf+LDNS_NSCOUNT_OFF))
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/* Counter of the additional section */
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#define LDNS_ARCOUNT_OFF 10
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#define LDNS_ARCOUNT(wirebuf) (ldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF))
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/**
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* converts the data on the uint8_t bytearray (in wire format) to a DNS packet.
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* This function will initialize and allocate memory space for the packet
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* structure.
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*
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* \param[in] packet pointer to the structure to hold the packet
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* \param[in] data pointer to the buffer with the data
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* \param[in] len the length of the data buffer (in bytes)
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* \return LDNS_STATUS_OK if everything succeeds, error otherwise
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*/
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ldns_status ldns_wire2pkt(ldns_pkt **packet, const uint8_t *data, size_t len);
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/**
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* converts the data on the uint8_t bytearray (in wire format) to a DNS packet.
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* This function will initialize and allocate memory space for the packet
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* structure.
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*
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* \param[in] packet pointer to the structure to hold the packet
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* \param[in] buffer the buffer with the data
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* \return LDNS_STATUS_OK if everything succeeds, error otherwise
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*/
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ldns_status ldns_buffer2pkt_wire(ldns_pkt **packet, ldns_buffer *buffer);
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/**
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* converts the data on the uint8_t bytearray (in wire format) to a DNS
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* dname rdata field. This function will initialize and allocate memory
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* space for the dname structure. The length of the wiredata of this rdf
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* is added to the *pos value.
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*
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* \param[in] dname pointer to the structure to hold the rdata value
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* \param[in] wire pointer to the buffer with the data
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* \param[in] max the length of the data buffer (in bytes)
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* \param[in] pos the position of the rdf in the buffer (ie. the number of bytes
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* from the start of the buffer)
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* \return LDNS_STATUS_OK if everything succeeds, error otherwise
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*/
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ldns_status ldns_wire2dname(ldns_rdf **dname, const uint8_t *wire, size_t max, size_t *pos);
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/**
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* converts the data on the uint8_t bytearray (in wire format) to DNS
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* rdata fields, and adds them to the list of rdfs of the given rr.
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* This function will initialize and allocate memory space for the dname
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* structures.
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* The length of the wiredata of these rdfs is added to the *pos value.
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*
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* All rdfs belonging to the RR are read; the rr should have no rdfs
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* yet. An error is returned if the format cannot be parsed.
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*
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* \param[in] rr pointer to the ldns_rr structure to hold the rdata value
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* \param[in] wire pointer to the buffer with the data
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* \param[in] max the length of the data buffer (in bytes)
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* \param[in] pos the position of the rdf in the buffer (ie. the number of bytes
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* from the start of the buffer)
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* \return LDNS_STATUS_OK if everything succeeds, error otherwise
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*/
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ldns_status ldns_wire2rdf(ldns_rr *rr, const uint8_t *wire, size_t max, size_t *pos);
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/**
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* converts the data on the uint8_t bytearray (in wire format) to a DNS
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* resource record.
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* This function will initialize and allocate memory space for the rr
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* structure.
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* The length of the wiredata of this rr is added to the *pos value.
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*
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* \param[in] rr pointer to the structure to hold the rdata value
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* \param[in] wire pointer to the buffer with the data
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* \param[in] max the length of the data buffer (in bytes)
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* \param[in] pos the position of the rr in the buffer (ie. the number of bytes
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* from the start of the buffer)
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* \param[in] section the section in the packet the rr is meant for
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* \return LDNS_STATUS_OK if everything succeeds, error otherwise
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*/
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ldns_status ldns_wire2rr(ldns_rr **rr, const uint8_t *wire, size_t max, size_t *pos, ldns_pkt_section section);
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#ifdef __cplusplus
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}
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#endif
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#endif /* LDNS_WIRE2HOST_H */
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