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158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
/*
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* pkthdr.h - packet header 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 for the packet header.
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*/
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#ifndef LDNS_PKTHDR_H
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#define LDNS_PKTHDR_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) (sldns_read_uint16(wirebuf))
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#define LDNS_ID_SET(wirebuf, id) (sldns_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) (sldns_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) (sldns_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) (sldns_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) (sldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF))
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/**
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* The sections of a packet
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*/
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enum sldns_enum_pkt_section {
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LDNS_SECTION_QUESTION = 0,
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LDNS_SECTION_ANSWER = 1,
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LDNS_SECTION_AUTHORITY = 2,
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LDNS_SECTION_ADDITIONAL = 3,
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/** bogus section, if not interested */
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LDNS_SECTION_ANY = 4,
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/** used to get all non-question rrs from a packet */
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LDNS_SECTION_ANY_NOQUESTION = 5
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};
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typedef enum sldns_enum_pkt_section sldns_pkt_section;
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/* opcodes for pkt's */
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enum sldns_enum_pkt_opcode {
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LDNS_PACKET_QUERY = 0,
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LDNS_PACKET_IQUERY = 1,
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LDNS_PACKET_STATUS = 2, /* there is no 3?? DNS is weird */
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LDNS_PACKET_NOTIFY = 4,
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LDNS_PACKET_UPDATE = 5
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};
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typedef enum sldns_enum_pkt_opcode sldns_pkt_opcode;
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/* rcodes for pkts */
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enum sldns_enum_pkt_rcode {
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LDNS_RCODE_NOERROR = 0,
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LDNS_RCODE_FORMERR = 1,
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LDNS_RCODE_SERVFAIL = 2,
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LDNS_RCODE_NXDOMAIN = 3,
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LDNS_RCODE_NOTIMPL = 4,
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LDNS_RCODE_REFUSED = 5,
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LDNS_RCODE_YXDOMAIN = 6,
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LDNS_RCODE_YXRRSET = 7,
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LDNS_RCODE_NXRRSET = 8,
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LDNS_RCODE_NOTAUTH = 9,
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LDNS_RCODE_NOTZONE = 10
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};
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typedef enum sldns_enum_pkt_rcode sldns_pkt_rcode;
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#ifdef __cplusplus
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}
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#endif
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#endif /* LDNS_PKTHDR_H */
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