wire2host.h

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/*
 * wire2host.h - from wire conversion routines
 *
 * a Net::DNS like library for C
 *
 * (c) NLnet Labs, 2005-2006
 *
 * See the file LICENSE for the license
 */
 
#ifndef LDNS_WIRE2HOST_H
#define LDNS_WIRE2HOST_H
 
#include <ldns/rdata.h>
#include <ldns/common.h>
#include <ldns/error.h>
#include <ldns/rr.h>
#include <ldns/packet.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* The length of the header */
#define LDNS_HEADER_SIZE        12
 
/* First octet of flags */
#define LDNS_RD_MASK            0x01U
#define LDNS_RD_SHIFT   0
#define LDNS_RD_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_RD_MASK)
#define LDNS_RD_SET(wirebuf)    (*(wirebuf+2) |= LDNS_RD_MASK)
#define LDNS_RD_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_RD_MASK)
 
#define LDNS_TC_MASK            0x02U
#define LDNS_TC_SHIFT   1
#define LDNS_TC_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_TC_MASK)
#define LDNS_TC_SET(wirebuf)    (*(wirebuf+2) |= LDNS_TC_MASK)
#define LDNS_TC_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_TC_MASK)
 
#define LDNS_AA_MASK            0x04U
#define LDNS_AA_SHIFT   2
#define LDNS_AA_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_AA_MASK)
#define LDNS_AA_SET(wirebuf)    (*(wirebuf+2) |= LDNS_AA_MASK)
#define LDNS_AA_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_AA_MASK)
 
#define LDNS_OPCODE_MASK        0x78U
#define LDNS_OPCODE_SHIFT       3
#define LDNS_OPCODE_WIRE(wirebuf)       ((*(wirebuf+2) & LDNS_OPCODE_MASK) >> LDNS_OPCODE_SHIFT)
#define LDNS_OPCODE_SET(wirebuf, opcode) \
        (*(wirebuf+2) = ((*(wirebuf+2)) & ~LDNS_OPCODE_MASK) | ((opcode) << LDNS_OPCODE_SHIFT))
 
#define LDNS_QR_MASK            0x80U
#define LDNS_QR_SHIFT   7
#define LDNS_QR_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_QR_MASK)
#define LDNS_QR_SET(wirebuf)    (*(wirebuf+2) |= LDNS_QR_MASK)
#define LDNS_QR_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_QR_MASK)
 
/* Second octet of flags */
#define LDNS_RCODE_MASK 0x0fU
#define LDNS_RCODE_SHIFT        0
#define LDNS_RCODE_WIRE(wirebuf)        (*(wirebuf+3) & LDNS_RCODE_MASK)
#define LDNS_RCODE_SET(wirebuf, rcode) \
        (*(wirebuf+3) = ((*(wirebuf+3)) & ~LDNS_RCODE_MASK) | (rcode))
 
#define LDNS_CD_MASK            0x10U
#define LDNS_CD_SHIFT   4
#define LDNS_CD_WIRE(wirebuf)   (*(wirebuf+3) & LDNS_CD_MASK)
#define LDNS_CD_SET(wirebuf)    (*(wirebuf+3) |= LDNS_CD_MASK)
#define LDNS_CD_CLR(wirebuf)    (*(wirebuf+3) &= ~LDNS_CD_MASK)
 
#define LDNS_AD_MASK            0x20U
#define LDNS_AD_SHIFT   5
#define LDNS_AD_WIRE(wirebuf)   (*(wirebuf+3) & LDNS_AD_MASK)
#define LDNS_AD_SET(wirebuf)    (*(wirebuf+3) |= LDNS_AD_MASK)
#define LDNS_AD_CLR(wirebuf)    (*(wirebuf+3) &= ~LDNS_AD_MASK)
 
#define LDNS_Z_MASK             0x40U
#define LDNS_Z_SHIFT            6
#define LDNS_Z_WIRE(wirebuf)    (*(wirebuf+3) & LDNS_Z_MASK)
#define LDNS_Z_SET(wirebuf)     (*(wirebuf+3) |= LDNS_Z_MASK)
#define LDNS_Z_CLR(wirebuf)     (*(wirebuf+3) &= ~LDNS_Z_MASK)
 
#define LDNS_RA_MASK            0x80U
#define LDNS_RA_SHIFT   7
#define LDNS_RA_WIRE(wirebuf)   (*(wirebuf+3) & LDNS_RA_MASK)
#define LDNS_RA_SET(wirebuf)    (*(wirebuf+3) |= LDNS_RA_MASK)
#define LDNS_RA_CLR(wirebuf)    (*(wirebuf+3) &= ~LDNS_RA_MASK)
 
/* Query ID */
#define LDNS_ID_WIRE(wirebuf)           (ldns_read_uint16(wirebuf))
#define LDNS_ID_SET(wirebuf, id)        (ldns_write_uint16(wirebuf, id))
 
/* Counter of the question section */
#define LDNS_QDCOUNT_OFF                4
#define LDNS_QDCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_QDCOUNT_OFF))
 
/* Counter of the answer section */
#define LDNS_ANCOUNT_OFF                6
#define LDNS_ANCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_ANCOUNT_OFF))
 
/* Counter of the authority section */
#define LDNS_NSCOUNT_OFF                8
#define LDNS_NSCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_NSCOUNT_OFF))
 
/* Counter of the additional section */
#define LDNS_ARCOUNT_OFF                10
#define LDNS_ARCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF))
 
ldns_status ldns_wire2pkt(ldns_pkt **packet, const uint8_t *data, size_t len);
 
ldns_status ldns_buffer2pkt_wire(ldns_pkt **packet, const ldns_buffer *buffer);
 
ldns_status ldns_wire2dname(ldns_rdf **dname, const uint8_t *wire, size_t max, size_t *pos);
 
ldns_status ldns_wire2rdf(ldns_rr *rr, const uint8_t *wire, size_t max, size_t *pos);
 
ldns_status ldns_wire2rr(ldns_rr **rr, const uint8_t *wire, size_t max, size_t *pos, ldns_pkt_section section);
 
#ifdef __cplusplus
}
#endif
 
#endif /* LDNS_WIRE2HOST_H */