/* * 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 GLDNS_PKTHDR_H #define GLDNS_PKTHDR_H #ifdef __cplusplus extern "C" { #endif /* The length of the header */ #define GLDNS_HEADER_SIZE 12 /* First octet of flags */ #define GLDNS_RD_MASK 0x01U #define GLDNS_RD_SHIFT 0 #define GLDNS_RD_WIRE(wirebuf) (*(wirebuf+2) & GLDNS_RD_MASK) #define GLDNS_RD_SET(wirebuf) (*(wirebuf+2) |= GLDNS_RD_MASK) #define GLDNS_RD_CLR(wirebuf) (*(wirebuf+2) &= ~GLDNS_RD_MASK) #define GLDNS_TC_MASK 0x02U #define GLDNS_TC_SHIFT 1 #define GLDNS_TC_WIRE(wirebuf) (*(wirebuf+2) & GLDNS_TC_MASK) #define GLDNS_TC_SET(wirebuf) (*(wirebuf+2) |= GLDNS_TC_MASK) #define GLDNS_TC_CLR(wirebuf) (*(wirebuf+2) &= ~GLDNS_TC_MASK) #define GLDNS_AA_MASK 0x04U #define GLDNS_AA_SHIFT 2 #define GLDNS_AA_WIRE(wirebuf) (*(wirebuf+2) & GLDNS_AA_MASK) #define GLDNS_AA_SET(wirebuf) (*(wirebuf+2) |= GLDNS_AA_MASK) #define GLDNS_AA_CLR(wirebuf) (*(wirebuf+2) &= ~GLDNS_AA_MASK) #define GLDNS_OPCODE_MASK 0x78U #define GLDNS_OPCODE_SHIFT 3 #define GLDNS_OPCODE_WIRE(wirebuf) ((*(wirebuf+2) & GLDNS_OPCODE_MASK) >> GLDNS_OPCODE_SHIFT) #define GLDNS_OPCODE_SET(wirebuf, opcode) \ (*(wirebuf+2) = ((*(wirebuf+2)) & ~GLDNS_OPCODE_MASK) | ((opcode) << GLDNS_OPCODE_SHIFT)) #define GLDNS_QR_MASK 0x80U #define GLDNS_QR_SHIFT 7 #define GLDNS_QR_WIRE(wirebuf) (*(wirebuf+2) & GLDNS_QR_MASK) #define GLDNS_QR_SET(wirebuf) (*(wirebuf+2) |= GLDNS_QR_MASK) #define GLDNS_QR_CLR(wirebuf) (*(wirebuf+2) &= ~GLDNS_QR_MASK) /* Second octet of flags */ #define GLDNS_RCODE_MASK 0x0fU #define GLDNS_RCODE_SHIFT 0 #define GLDNS_RCODE_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_RCODE_MASK) #define GLDNS_RCODE_SET(wirebuf, rcode) \ (*(wirebuf+3) = ((*(wirebuf+3)) & ~GLDNS_RCODE_MASK) | (rcode)) #define GLDNS_CD_MASK 0x10U #define GLDNS_CD_SHIFT 4 #define GLDNS_CD_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_CD_MASK) #define GLDNS_CD_SET(wirebuf) (*(wirebuf+3) |= GLDNS_CD_MASK) #define GLDNS_CD_CLR(wirebuf) (*(wirebuf+3) &= ~GLDNS_CD_MASK) #define GLDNS_AD_MASK 0x20U #define GLDNS_AD_SHIFT 5 #define GLDNS_AD_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_AD_MASK) #define GLDNS_AD_SET(wirebuf) (*(wirebuf+3) |= GLDNS_AD_MASK) #define GLDNS_AD_CLR(wirebuf) (*(wirebuf+3) &= ~GLDNS_AD_MASK) #define GLDNS_Z_MASK 0x40U #define GLDNS_Z_SHIFT 6 #define GLDNS_Z_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_Z_MASK) #define GLDNS_Z_SET(wirebuf) (*(wirebuf+3) |= GLDNS_Z_MASK) #define GLDNS_Z_CLR(wirebuf) (*(wirebuf+3) &= ~GLDNS_Z_MASK) #define GLDNS_RA_MASK 0x80U #define GLDNS_RA_SHIFT 7 #define GLDNS_RA_WIRE(wirebuf) (*(wirebuf+3) & GLDNS_RA_MASK) #define GLDNS_RA_SET(wirebuf) (*(wirebuf+3) |= GLDNS_RA_MASK) #define GLDNS_RA_CLR(wirebuf) (*(wirebuf+3) &= ~GLDNS_RA_MASK) /* Query ID */ #define GLDNS_ID_WIRE(wirebuf) (gldns_read_uint16(wirebuf)) #define GLDNS_ID_SET(wirebuf, id) (gldns_write_uint16(wirebuf, id)) /* Counter of the question section */ #define GLDNS_QDCOUNT_OFF 4 /* #define QDCOUNT(wirebuf) (ntohs(*(uint16_t *)(wirebuf+QDCOUNT_OFF))) */ #define GLDNS_QDCOUNT(wirebuf) (gldns_read_uint16(wirebuf+GLDNS_QDCOUNT_OFF)) /* Counter of the answer section */ #define GLDNS_ANCOUNT_OFF 6 #define GLDNS_ANCOUNT(wirebuf) (gldns_read_uint16(wirebuf+GLDNS_ANCOUNT_OFF)) /* Counter of the authority section */ #define GLDNS_NSCOUNT_OFF 8 #define GLDNS_NSCOUNT(wirebuf) (gldns_read_uint16(wirebuf+GLDNS_NSCOUNT_OFF)) /* Counter of the additional section */ #define GLDNS_ARCOUNT_OFF 10 #define GLDNS_ARCOUNT(wirebuf) (gldns_read_uint16(wirebuf+GLDNS_ARCOUNT_OFF)) /** * The sections of a packet */ enum gldns_enum_pkt_section { GLDNS_SECTION_QUESTION = 0, GLDNS_SECTION_ANSWER = 1, GLDNS_SECTION_AUTHORITY = 2, GLDNS_SECTION_ADDITIONAL = 3, /** bogus section, if not interested */ GLDNS_SECTION_ANY = 4, /** used to get all non-question rrs from a packet */ GLDNS_SECTION_ANY_NOQUESTION = 5 }; typedef enum gldns_enum_pkt_section gldns_pkt_section; /* opcodes for pkt's */ enum gldns_enum_pkt_opcode { GLDNS_PACKET_QUERY = 0, GLDNS_PACKET_IQUERY = 1, GLDNS_PACKET_STATUS = 2, /* there is no 3?? DNS is weird */ GLDNS_PACKET_NOTIFY = 4, GLDNS_PACKET_UPDATE = 5 }; typedef enum gldns_enum_pkt_opcode gldns_pkt_opcode; /* rcodes for pkts */ enum gldns_enum_pkt_rcode { GLDNS_RCODE_NOERROR = 0, GLDNS_RCODE_FORMERR = 1, GLDNS_RCODE_SERVFAIL = 2, GLDNS_RCODE_NXDOMAIN = 3, GLDNS_RCODE_NOTIMPL = 4, GLDNS_RCODE_REFUSED = 5, GLDNS_RCODE_YXDOMAIN = 6, GLDNS_RCODE_YXRRSET = 7, GLDNS_RCODE_NXRRSET = 8, GLDNS_RCODE_NOTAUTH = 9, GLDNS_RCODE_NOTZONE = 10 }; typedef enum gldns_enum_pkt_rcode gldns_pkt_rcode; #ifdef __cplusplus } #endif #endif /* GLDNS_PKTHDR_H */