mirror of https://github.com/getdnsapi/getdns.git
159 lines
5.0 KiB
C
159 lines
5.0 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 GLDNS_PKTHDR_H
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#define GLDNS_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 GLDNS_HEADER_SIZE 12
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/* First octet of flags */
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#define GLDNS_RD_MASK 0x01U
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#define GLDNS_RD_SHIFT 0
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#define GLDNS_RD_WIRE(wirebuf) (*(wirebuf+2) & GLDNS_RD_MASK)
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#define GLDNS_RD_SET(wirebuf) (*(wirebuf+2) |= GLDNS_RD_MASK)
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#define GLDNS_RD_CLR(wirebuf) (*(wirebuf+2) &= ~GLDNS_RD_MASK)
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#define GLDNS_TC_MASK 0x02U
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#define GLDNS_TC_SHIFT 1
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#define GLDNS_TC_WIRE(wirebuf) (*(wirebuf+2) & GLDNS_TC_MASK)
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#define GLDNS_TC_SET(wirebuf) (*(wirebuf+2) |= GLDNS_TC_MASK)
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#define GLDNS_TC_CLR(wirebuf) (*(wirebuf+2) &= ~GLDNS_TC_MASK)
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#define GLDNS_AA_MASK 0x04U
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#define GLDNS_AA_SHIFT 2
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#define GLDNS_AA_WIRE(wirebuf) (*(wirebuf+2) & GLDNS_AA_MASK)
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#define GLDNS_AA_SET(wirebuf) (*(wirebuf+2) |= GLDNS_AA_MASK)
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#define GLDNS_AA_CLR(wirebuf) (*(wirebuf+2) &= ~GLDNS_AA_MASK)
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#define GLDNS_OPCODE_MASK 0x78U
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#define GLDNS_OPCODE_SHIFT 3
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#define GLDNS_OPCODE_WIRE(wirebuf) ((*(wirebuf+2) & GLDNS_OPCODE_MASK) >> GLDNS_OPCODE_SHIFT)
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#define GLDNS_OPCODE_SET(wirebuf, opcode) \
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(*(wirebuf+2) = ((*(wirebuf+2)) & ~GLDNS_OPCODE_MASK) | ((opcode) << GLDNS_OPCODE_SHIFT))
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#define GLDNS_QR_MASK 0x80U
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#define GLDNS_QR_SHIFT 7
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#define GLDNS_QR_WIRE(wirebuf) (*(wirebuf+2) & GLDNS_QR_MASK)
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#define GLDNS_QR_SET(wirebuf) (*(wirebuf+2) |= GLDNS_QR_MASK)
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#define GLDNS_QR_CLR(wirebuf) (*(wirebuf+2) &= ~GLDNS_QR_MASK)
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/* Second octet of flags */
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#define GLDNS_RCODE_MASK 0x0fU
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#define GLDNS_RCODE_SHIFT 0
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#define GLDNS_RCODE_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_RCODE_MASK)
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#define GLDNS_RCODE_SET(wirebuf, rcode) \
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(*(wirebuf+3) = ((*(wirebuf+3)) & ~GLDNS_RCODE_MASK) | (rcode))
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#define GLDNS_CD_MASK 0x10U
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#define GLDNS_CD_SHIFT 4
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#define GLDNS_CD_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_CD_MASK)
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#define GLDNS_CD_SET(wirebuf) (*(wirebuf+3) |= GLDNS_CD_MASK)
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#define GLDNS_CD_CLR(wirebuf) (*(wirebuf+3) &= ~GLDNS_CD_MASK)
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#define GLDNS_AD_MASK 0x20U
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#define GLDNS_AD_SHIFT 5
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#define GLDNS_AD_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_AD_MASK)
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#define GLDNS_AD_SET(wirebuf) (*(wirebuf+3) |= GLDNS_AD_MASK)
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#define GLDNS_AD_CLR(wirebuf) (*(wirebuf+3) &= ~GLDNS_AD_MASK)
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#define GLDNS_Z_MASK 0x40U
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#define GLDNS_Z_SHIFT 6
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#define GLDNS_Z_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_Z_MASK)
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#define GLDNS_Z_SET(wirebuf) (*(wirebuf+3) |= GLDNS_Z_MASK)
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#define GLDNS_Z_CLR(wirebuf) (*(wirebuf+3) &= ~GLDNS_Z_MASK)
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#define GLDNS_RA_MASK 0x80U
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#define GLDNS_RA_SHIFT 7
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#define GLDNS_RA_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_RA_MASK)
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#define GLDNS_RA_SET(wirebuf) (*(wirebuf+3) |= GLDNS_RA_MASK)
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#define GLDNS_RA_CLR(wirebuf) (*(wirebuf+3) &= ~GLDNS_RA_MASK)
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/* Query ID */
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#define GLDNS_ID_WIRE(wirebuf) (gldns_read_uint16(wirebuf))
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#define GLDNS_ID_SET(wirebuf, id) (gldns_write_uint16(wirebuf, id))
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/* Counter of the question section */
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#define GLDNS_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 GLDNS_QDCOUNT(wirebuf) (gldns_read_uint16(wirebuf+GLDNS_QDCOUNT_OFF))
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/* Counter of the answer section */
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#define GLDNS_ANCOUNT_OFF 6
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#define GLDNS_ANCOUNT(wirebuf) (gldns_read_uint16(wirebuf+GLDNS_ANCOUNT_OFF))
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/* Counter of the authority section */
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#define GLDNS_NSCOUNT_OFF 8
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#define GLDNS_NSCOUNT(wirebuf) (gldns_read_uint16(wirebuf+GLDNS_NSCOUNT_OFF))
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/* Counter of the additional section */
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#define GLDNS_ARCOUNT_OFF 10
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#define GLDNS_ARCOUNT(wirebuf) (gldns_read_uint16(wirebuf+GLDNS_ARCOUNT_OFF))
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/**
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* The sections of a packet
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*/
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enum gldns_enum_pkt_section {
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GLDNS_SECTION_QUESTION = 0,
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GLDNS_SECTION_ANSWER = 1,
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GLDNS_SECTION_AUTHORITY = 2,
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GLDNS_SECTION_ADDITIONAL = 3,
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/** bogus section, if not interested */
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GLDNS_SECTION_ANY = 4,
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/** used to get all non-question rrs from a packet */
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GLDNS_SECTION_ANY_NOQUESTION = 5
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};
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typedef enum gldns_enum_pkt_section gldns_pkt_section;
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/* opcodes for pkt's */
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enum gldns_enum_pkt_opcode {
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GLDNS_PACKET_QUERY = 0,
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GLDNS_PACKET_IQUERY = 1,
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GLDNS_PACKET_STATUS = 2, /* there is no 3?? DNS is weird */
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GLDNS_PACKET_NOTIFY = 4,
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GLDNS_PACKET_UPDATE = 5
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};
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typedef enum gldns_enum_pkt_opcode gldns_pkt_opcode;
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/* rcodes for pkts */
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enum gldns_enum_pkt_rcode {
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GLDNS_RCODE_NOERROR = 0,
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GLDNS_RCODE_FORMERR = 1,
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GLDNS_RCODE_SERVFAIL = 2,
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GLDNS_RCODE_NXDOMAIN = 3,
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GLDNS_RCODE_NOTIMPL = 4,
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GLDNS_RCODE_REFUSED = 5,
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GLDNS_RCODE_YXDOMAIN = 6,
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GLDNS_RCODE_YXRRSET = 7,
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GLDNS_RCODE_NXRRSET = 8,
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GLDNS_RCODE_NOTAUTH = 9,
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GLDNS_RCODE_NOTZONE = 10
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};
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typedef enum gldns_enum_pkt_rcode gldns_pkt_rcode;
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#ifdef __cplusplus
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}
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#endif
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#endif /* GLDNS_PKTHDR_H */
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