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Diffstat (limited to '')
| -rw-r--r-- | external/unbound/ldns/pkthdr.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/external/unbound/ldns/pkthdr.h b/external/unbound/ldns/pkthdr.h new file mode 100644 index 000000000..de9952ea7 --- /dev/null +++ b/external/unbound/ldns/pkthdr.h @@ -0,0 +1,158 @@ +/* + * pkthdr.h - packet header from wire conversion routines + * + * a Net::DNS like library for C + * + * (c) NLnet Labs, 2005-2006 + * + * See the file LICENSE for the license + */ + +/** + * \file + * + * Contains functions that translate dns data from the wire format (as sent + * by servers and clients) to the internal structures for the packet header. + */ + +#ifndef LDNS_PKTHDR_H +#define LDNS_PKTHDR_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) (sldns_read_uint16(wirebuf)) +#define LDNS_ID_SET(wirebuf, id) (sldns_write_uint16(wirebuf, id)) + +/* Counter of the question section */ +#define LDNS_QDCOUNT_OFF 4 +/* +#define QDCOUNT(wirebuf) (ntohs(*(uint16_t *)(wirebuf+QDCOUNT_OFF))) +*/ +#define LDNS_QDCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_QDCOUNT_OFF)) + +/* Counter of the answer section */ +#define LDNS_ANCOUNT_OFF 6 +#define LDNS_ANCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_ANCOUNT_OFF)) + +/* Counter of the authority section */ +#define LDNS_NSCOUNT_OFF 8 +#define LDNS_NSCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_NSCOUNT_OFF)) + +/* Counter of the additional section */ +#define LDNS_ARCOUNT_OFF 10 +#define LDNS_ARCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF)) + +/** + * The sections of a packet + */ +enum sldns_enum_pkt_section { + LDNS_SECTION_QUESTION = 0, + LDNS_SECTION_ANSWER = 1, + LDNS_SECTION_AUTHORITY = 2, + LDNS_SECTION_ADDITIONAL = 3, + /** bogus section, if not interested */ + LDNS_SECTION_ANY = 4, + /** used to get all non-question rrs from a packet */ + LDNS_SECTION_ANY_NOQUESTION = 5 +}; +typedef enum sldns_enum_pkt_section sldns_pkt_section; + +/* opcodes for pkt's */ +enum sldns_enum_pkt_opcode { + LDNS_PACKET_QUERY = 0, + LDNS_PACKET_IQUERY = 1, + LDNS_PACKET_STATUS = 2, /* there is no 3?? DNS is weird */ + LDNS_PACKET_NOTIFY = 4, + LDNS_PACKET_UPDATE = 5 +}; +typedef enum sldns_enum_pkt_opcode sldns_pkt_opcode; + +/* rcodes for pkts */ +enum sldns_enum_pkt_rcode { + LDNS_RCODE_NOERROR = 0, + LDNS_RCODE_FORMERR = 1, + LDNS_RCODE_SERVFAIL = 2, + LDNS_RCODE_NXDOMAIN = 3, + LDNS_RCODE_NOTIMPL = 4, + LDNS_RCODE_REFUSED = 5, + LDNS_RCODE_YXDOMAIN = 6, + LDNS_RCODE_YXRRSET = 7, + LDNS_RCODE_NXRRSET = 8, + LDNS_RCODE_NOTAUTH = 9, + LDNS_RCODE_NOTZONE = 10 +}; +typedef enum sldns_enum_pkt_rcode sldns_pkt_rcode; + +#ifdef __cplusplus +} +#endif + +#endif /* LDNS_PKTHDR_H */ |