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, 2005-2006
00007  *
00008  * See the file LICENSE for the license
00009  */
00010 
00018 #ifndef LDNS_WIRE2HOST_H
00019 #define LDNS_WIRE2HOST_H
00020 
00021 #include <ldns/rdata.h>
00022 #include <ldns/common.h>
00023 #include <ldns/error.h>
00024 #include <ldns/rr.h>
00025 #include <ldns/packet.h>
00026 
00027 #ifdef __cplusplus
00028 extern "C" {
00029 #endif
00030 
00031 /* The length of the header */
00032 #define LDNS_HEADER_SIZE        12
00033 
00034 /* First octet of flags */
00035 #define LDNS_RD_MASK            0x01U
00036 #define LDNS_RD_SHIFT   0
00037 #define LDNS_RD_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_RD_MASK)
00038 #define LDNS_RD_SET(wirebuf)    (*(wirebuf+2) |= LDNS_RD_MASK)
00039 #define LDNS_RD_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_RD_MASK)
00040 
00041 #define LDNS_TC_MASK            0x02U
00042 #define LDNS_TC_SHIFT   1
00043 #define LDNS_TC_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_TC_MASK)
00044 #define LDNS_TC_SET(wirebuf)    (*(wirebuf+2) |= LDNS_TC_MASK)
00045 #define LDNS_TC_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_TC_MASK)
00046 
00047 #define LDNS_AA_MASK            0x04U
00048 #define LDNS_AA_SHIFT   2
00049 #define LDNS_AA_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_AA_MASK)
00050 #define LDNS_AA_SET(wirebuf)    (*(wirebuf+2) |= LDNS_AA_MASK)
00051 #define LDNS_AA_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_AA_MASK)
00052 
00053 #define LDNS_OPCODE_MASK        0x78U
00054 #define LDNS_OPCODE_SHIFT       3
00055 #define LDNS_OPCODE_WIRE(wirebuf)       ((*(wirebuf+2) & LDNS_OPCODE_MASK) >> LDNS_OPCODE_SHIFT)
00056 #define LDNS_OPCODE_SET(wirebuf, opcode) \
00057         (*(wirebuf+2) = ((*(wirebuf+2)) & ~LDNS_OPCODE_MASK) | ((opcode) << LDNS_OPCODE_SHIFT))
00058 
00059 #define LDNS_QR_MASK            0x80U
00060 #define LDNS_QR_SHIFT   7
00061 #define LDNS_QR_WIRE(wirebuf)   (*(wirebuf+2) & LDNS_QR_MASK)
00062 #define LDNS_QR_SET(wirebuf)    (*(wirebuf+2) |= LDNS_QR_MASK)
00063 #define LDNS_QR_CLR(wirebuf)    (*(wirebuf+2) &= ~LDNS_QR_MASK)
00064 
00065 /* Second octet of flags */
00066 #define LDNS_RCODE_MASK 0x0fU
00067 #define LDNS_RCODE_SHIFT        0
00068 #define LDNS_RCODE_WIRE(wirebuf)        (*(wirebuf+3) & LDNS_RCODE_MASK)
00069 #define LDNS_RCODE_SET(wirebuf, rcode) \
00070         (*(wirebuf+3) = ((*(wirebuf+3)) & ~LDNS_RCODE_MASK) | (rcode))
00071 
00072 #define LDNS_CD_MASK            0x10U
00073 #define LDNS_CD_SHIFT   4
00074 #define LDNS_CD_WIRE(wirebuf)   (*(wirebuf+3) & LDNS_CD_MASK)
00075 #define LDNS_CD_SET(wirebuf)    (*(wirebuf+3) |= LDNS_CD_MASK)
00076 #define LDNS_CD_CLR(wirebuf)    (*(wirebuf+3) &= ~LDNS_CD_MASK)
00077 
00078 #define LDNS_AD_MASK            0x20U
00079 #define LDNS_AD_SHIFT   5
00080 #define LDNS_AD_WIRE(wirebuf)   (*(wirebuf+3) & LDNS_AD_MASK)
00081 #define LDNS_AD_SET(wirebuf)    (*(wirebuf+3) |= LDNS_AD_MASK)
00082 #define LDNS_AD_CLR(wirebuf)    (*(wirebuf+3) &= ~LDNS_AD_MASK)
00083 
00084 #define LDNS_Z_MASK             0x40U
00085 #define LDNS_Z_SHIFT            6
00086 #define LDNS_Z_WIRE(wirebuf)    (*(wirebuf+3) & LDNS_Z_MASK)
00087 #define LDNS_Z_SET(wirebuf)     (*(wirebuf+3) |= LDNS_Z_MASK)
00088 #define LDNS_Z_CLR(wirebuf)     (*(wirebuf+3) &= ~LDNS_Z_MASK)
00089 
00090 #define LDNS_RA_MASK            0x80U
00091 #define LDNS_RA_SHIFT   7
00092 #define LDNS_RA_WIRE(wirebuf)   (*(wirebuf+3) & LDNS_RA_MASK)
00093 #define LDNS_RA_SET(wirebuf)    (*(wirebuf+3) |= LDNS_RA_MASK)
00094 #define LDNS_RA_CLR(wirebuf)    (*(wirebuf+3) &= ~LDNS_RA_MASK)
00095 
00096 /* Query ID */
00097 #define LDNS_ID_WIRE(wirebuf)           (ldns_read_uint16(wirebuf))
00098 #define LDNS_ID_SET(wirebuf, id)        (ldns_write_uint16(wirebuf, id))
00099 
00100 /* Counter of the question section */
00101 #define LDNS_QDCOUNT_OFF                4
00102 /*
00103 #define QDCOUNT(wirebuf)                (ntohs(*(uint16_t *)(wirebuf+QDCOUNT_OFF)))
00104 */
00105 #define LDNS_QDCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_QDCOUNT_OFF))
00106 
00107 /* Counter of the answer section */
00108 #define LDNS_ANCOUNT_OFF                6
00109 #define LDNS_ANCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_ANCOUNT_OFF))
00110 
00111 /* Counter of the authority section */
00112 #define LDNS_NSCOUNT_OFF                8
00113 #define LDNS_NSCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_NSCOUNT_OFF))
00114 
00115 /* Counter of the additional section */
00116 #define LDNS_ARCOUNT_OFF                10
00117 #define LDNS_ARCOUNT(wirebuf)           (ldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF))
00118 
00129 ldns_status ldns_wire2pkt(ldns_pkt **packet, const uint8_t *data, size_t len);
00130 
00140 ldns_status ldns_buffer2pkt_wire(ldns_pkt **packet, ldns_buffer *buffer);
00141 
00155 ldns_status ldns_wire2dname(ldns_rdf **dname, const uint8_t *wire, size_t max, size_t *pos);
00156 
00174 ldns_status ldns_wire2rdf(ldns_rr *rr, const uint8_t *wire, size_t max, size_t *pos);
00175 
00191 ldns_status ldns_wire2rr(ldns_rr **rr, const uint8_t *wire, size_t max, size_t *pos, ldns_pkt_section section);
00192 
00193 #ifdef __cplusplus
00194 }
00195 #endif
00196 
00197 #endif /* LDNS_WIRE2HOST_H */

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