wire2host.h

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00001 /*
00002  * wire2host.h - from wire conversion routines
00003  *
00004  * a Net::DNS like library for C
00005  *
00006  * (c) NLnet Labs, 2004, 2005
00007  *
00008  * See the file LICENSE for the license
00009  */
00010 
00011 #include <ldns/rdata.h>
00012 
00013 #ifndef _LDNS_WIRE2HOST_H
00014 #define _LDNS_WIRE2HOST_H
00015 
00016 #include <ldns/common.h>
00017 #include <ldns/error.h>
00018 #include <ldns/rr.h>
00019 #include <ldns/packet.h>
00020 
00021 /* The length of the header */
00022 #define LDNS_HEADER_SIZE        12
00023 
00024 /* First octet of flags */
00025 #define LDNS_RD_MASK            0x01U
00026 #define LDNS_RD_SHIFT   0
00027 #define LDNS_RD_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_RD_MASK)
00028 #define LDNS_RD_SET(wirebuf)    (*(wirebuf+2) |= LDNS_RD_MASK)
00029 #define LDNS_RD_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_RD_MASK)
00030 
00031 #define LDNS_TC_MASK            0x02U
00032 #define LDNS_TC_SHIFT   1
00033 #define LDNS_TC_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_TC_MASK)
00034 #define LDNS_TC_SET(wirebuf)    (*(wirebuf+2) |= LDNS_TC_MASK)
00035 #define LDNS_TC_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_TC_MASK)
00036 
00037 #define LDNS_AA_MASK            0x04U
00038 #define LDNS_AA_SHIFT   2
00039 #define LDNS_AA_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_AA_MASK)
00040 #define LDNS_AA_SET(wirebuf)    (*(wirebuf+2) |= LDNS_AA_MASK)
00041 #define LDNS_AA_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_AA_MASK)
00042 
00043 #define LDNS_OPCODE_MASK        0x78U
00044 #define LDNS_OPCODE_SHIFT       3
00045 #define LDNS_OPCODE_WIRE(wirebuf)       ((*(wirebuf+2) & LDNS_OPCODE_MASK) >> LDNS_OPCODE_SHIFT)
00046 #define LDNS_OPCODE_SET(wirebuf, opcode) \
00047         (*(wirebuf+2) = ((*(wirebuf+2)) & ~LDNS_OPCODE_MASK) | ((opcode) << LDNS_OPCODE_SHIFT))
00048 
00049 #define LDNS_QR_MASK            0x80U
00050 #define LDNS_QR_SHIFT   7
00051 #define LDNS_QR_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_QR_MASK)
00052 #define LDNS_QR_SET(wirebuf)    (*(wirebuf+2) |= LDNS_QR_MASK)
00053 #define LDNS_QR_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_QR_MASK)
00054 
00055 /* Second octet of flags */
00056 #define LDNS_RCODE_MASK 0x0fU
00057 #define LDNS_RCODE_SHIFT        0
00058 #define LDNS_RCODE_WIRE(wirebuf)        (*(wirebuf+3) & LDNS_RCODE_MASK)
00059 #define LDNS_RCODE_SET(wirebuf, rcode) \
00060         (*(wirebuf+3) = ((*(wirebuf+3)) & ~LDNS_RCODE_MASK) | (rcode))
00061 
00062 #define LDNS_CD_MASK            0x10U
00063 #define LDNS_CD_SHIFT   4
00064 #define LDNS_CD_WIRE(wirebuf)   (*(wirebuf+3) & LDNS_CD_MASK)
00065 #define LDNS_CD_SET(wirebuf)    (*(wirebuf+3) |= LDNS_CD_MASK)
00066 #define LDNS_CD_CLR(wirebuf)    (*(wirebuf+3) &= ~LDNS_CD_MASK)
00067 
00068 #define LDNS_AD_MASK            0x20U
00069 #define LDNS_AD_SHIFT   5
00070 #define LDNS_AD_WIRE(wirebuf)   (*(wirebuf+3) & LDNS_AD_MASK)
00071 #define LDNS_AD_SET(wirebuf)    (*(wirebuf+3) |= LDNS_AD_MASK)
00072 #define LDNS_AD_CLR(wirebuf)    (*(wirebuf+3) &= ~LDNS_AD_MASK)
00073 
00074 #define LDNS_Z_MASK             0x40U
00075 #define LDNS_Z_SHIFT            6
00076 #define LDNS_Z_WIRE(wirebuf)    (*(wirebuf+3) & LDNS_Z_MASK)
00077 #define LDNS_Z_SET(wirebuf)     (*(wirebuf+3) |= LDNS_Z_MASK)
00078 #define LDNS_Z_CLR(wirebuf)     (*(wirebuf+3) &= ~LDNS_Z_MASK)
00079 
00080 #define LDNS_RA_MASK            0x80U
00081 #define LDNS_RA_SHIFT   7
00082 #define LDNS_RA_WIRE(wirebuf)   (*(wirebuf+3) & LDNS_RA_MASK)
00083 #define LDNS_RA_SET(wirebuf)    (*(wirebuf+3) |= LDNS_RA_MASK)
00084 #define LDNS_RA_CLR(wirebuf)    (*(wirebuf+3) &= ~LDNS_RA_MASK)
00085 
00086 /* Query ID */
00087 #define LDNS_ID_WIRE(wirebuf)                   (ldns_read_uint16(wirebuf))
00088 
00089 /* Counter of the question section */
00090 #define LDNS_QDCOUNT_OFF                4
00091 /*
00092 #define QDCOUNT(wirebuf)                (ntohs(*(uint16_t *)(wirebuf+QDCOUNT_OFF)))
00093 */
00094 #define LDNS_QDCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_QDCOUNT_OFF))
00095 
00096 /* Counter of the answer section */
00097 #define LDNS_ANCOUNT_OFF                6
00098 #define LDNS_ANCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_ANCOUNT_OFF))
00099 
00100 /* Counter of the authority section */
00101 #define LDNS_NSCOUNT_OFF                8
00102 #define LDNS_NSCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_NSCOUNT_OFF))
00103 
00104 /* Counter of the additional section */
00105 #define LDNS_ARCOUNT_OFF                10
00106 #define LDNS_ARCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF))
00107 
00118 ldns_status ldns_wire2pkt(ldns_pkt **packet, const uint8_t *data, size_t len);
00119 
00129 ldns_status ldns_buffer2pkt_wire(ldns_pkt **packet, ldns_buffer *buffer);
00130 
00144 ldns_status ldns_wire2dname(ldns_rdf **dname, const uint8_t *wire, size_t max, size_t *pos);
00145 
00160 ldns_status ldns_wire2rdf(ldns_rr *rr, const uint8_t *wire, size_t max, size_t *pos);
00161 
00177 ldns_status ldns_wire2rr(ldns_rr **rr, const uint8_t *wire, size_t max, size_t *pos, ldns_pkt_section section);
00178 
00179 #endif /* _LDNS_WIRE2HOST_H */

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