packet.h

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/*
 * packet.h
 *
 * DNS packet definitions
 *
 * a Net::DNS like library for C
 *
 * (c) NLnet Labs, 2005-2006
 *
 * See the file LICENSE for the license
 */
 
#ifndef LDNS_PACKET_H
#define LDNS_PACKET_H
 
#define LDNS_MAX_PACKETLEN         65535
 
/* allow flags to be given to ldns_pkt_query_new */
#define LDNS_QR         1       /* Query Response flag */
#define LDNS_AA         2       /* Authoritative Answer - server flag */
#define LDNS_TC         4       /* TrunCated - server flag */
#define LDNS_RD         8       /* Recursion Desired - query flag */
#define LDNS_CD         16      /* Checking Disabled - query flag */
#define LDNS_RA         32      /* Recursion Available - server flag */
#define LDNS_AD         64      /* Authenticated Data - server flag */
 
#include <ldns/error.h>
#include <ldns/common.h>
#include <ldns/rr.h>
#include <sys/time.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* opcodes for pkt's */
enum ldns_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 ldns_enum_pkt_opcode ldns_pkt_opcode;
 
/* rcodes for pkts */
enum ldns_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 ldns_enum_pkt_rcode ldns_pkt_rcode;
 
struct ldns_struct_hdr
{
        uint16_t _id;
        bool _qr;
        bool _aa;
        bool _tc;
        bool _rd;
        bool _cd;
        bool _ra;
        bool _ad;
        ldns_pkt_opcode _opcode;         /* XXX 8 bits? */
        uint8_t _rcode;
        uint16_t _qdcount;
        uint16_t _ancount;
        uint16_t _nscount;
        uint16_t _arcount;
};
typedef struct ldns_struct_hdr ldns_hdr;
 
struct ldns_struct_pkt
{
        ldns_hdr *_header;
        /* extra items needed in a packet */
        ldns_rdf *_answerfrom;
        struct timeval timestamp;
        uint32_t _querytime;
        size_t _size;
        ldns_rr *_tsig_rr;
        uint16_t _edns_udp_size;
        uint8_t _edns_extended_rcode;
        uint8_t _edns_version;
        /* OPT pseudo-RR presence flag */
        uint8_t _edns_present;
        uint16_t _edns_z;
        ldns_rdf *_edns_data;
        ldns_rr_list    *_question;
        ldns_rr_list    *_answer;
        ldns_rr_list    *_authority;
        ldns_rr_list    *_additional;
};
typedef struct ldns_struct_pkt ldns_pkt;
 
enum ldns_enum_pkt_section {
        LDNS_SECTION_QUESTION = 0,
        LDNS_SECTION_ANSWER = 1,
        LDNS_SECTION_AUTHORITY = 2,
        LDNS_SECTION_ADDITIONAL = 3,
        LDNS_SECTION_ANY = 4,
        LDNS_SECTION_ANY_NOQUESTION = 5
};
typedef enum ldns_enum_pkt_section ldns_pkt_section;    
 
enum ldns_enum_pkt_type {
        LDNS_PACKET_QUESTION,
        LDNS_PACKET_REFERRAL,
        LDNS_PACKET_ANSWER,
        LDNS_PACKET_NXDOMAIN,
        LDNS_PACKET_NODATA,
        LDNS_PACKET_UNKNOWN
};
typedef enum ldns_enum_pkt_type ldns_pkt_type;
 
/* prototypes */
 
/* read */
 
uint16_t ldns_pkt_id(const ldns_pkt *p);
bool ldns_pkt_qr(const ldns_pkt *p);
bool ldns_pkt_aa(const ldns_pkt *p);
bool ldns_pkt_tc(const ldns_pkt *p);
bool ldns_pkt_rd(const ldns_pkt *p);
bool ldns_pkt_cd(const ldns_pkt *p);
bool ldns_pkt_ra(const ldns_pkt *p);
bool ldns_pkt_ad(const ldns_pkt *p);
ldns_pkt_opcode ldns_pkt_get_opcode(const ldns_pkt *p);
ldns_pkt_rcode ldns_pkt_get_rcode(const ldns_pkt *p);
uint16_t ldns_pkt_qdcount(const ldns_pkt *p);
uint16_t ldns_pkt_ancount(const ldns_pkt *p);
uint16_t ldns_pkt_nscount(const ldns_pkt *p);
uint16_t ldns_pkt_arcount(const ldns_pkt *p);
 
ldns_rdf *ldns_pkt_answerfrom(const ldns_pkt *p);
 
struct timeval ldns_pkt_timestamp(const ldns_pkt *p);
uint32_t ldns_pkt_querytime(const ldns_pkt *p);
 
size_t ldns_pkt_size(const ldns_pkt *p);
 
uint16_t ldns_pkt_section_count(const ldns_pkt *p, ldns_pkt_section s);
 
ldns_rr *ldns_pkt_tsig(const ldns_pkt *p);
 
ldns_rr_list *ldns_pkt_question(const ldns_pkt *p);
ldns_rr_list *ldns_pkt_answer(const ldns_pkt *p);
ldns_rr_list *ldns_pkt_authority(const ldns_pkt *p);
ldns_rr_list *ldns_pkt_additional(const ldns_pkt *p);
ldns_rr_list *ldns_pkt_all(const ldns_pkt *p);
ldns_rr_list *ldns_pkt_all_noquestion(const ldns_pkt *p);
 
ldns_rr_list *ldns_pkt_get_section_clone(const ldns_pkt *p, ldns_pkt_section s);
 
ldns_rr_list *ldns_pkt_rr_list_by_name(const ldns_pkt *p, const ldns_rdf *r, ldns_pkt_section s);
ldns_rr_list *ldns_pkt_rr_list_by_type(const ldns_pkt *p, ldns_rr_type t, ldns_pkt_section s);
ldns_rr_list *ldns_pkt_rr_list_by_name_and_type(const ldns_pkt *packet, const ldns_rdf *ownername, ldns_rr_type type, ldns_pkt_section sec);
 
 
bool ldns_pkt_rr(const ldns_pkt *pkt, ldns_pkt_section sec, const ldns_rr *rr);
 
 
bool ldns_pkt_set_flags(ldns_pkt *pkt, uint16_t flags);
 
void ldns_pkt_set_id(ldns_pkt *p, uint16_t id);
void ldns_pkt_set_random_id(ldns_pkt *p);
void ldns_pkt_set_qr(ldns_pkt *p, bool b);
void ldns_pkt_set_aa(ldns_pkt *p, bool b);
void ldns_pkt_set_tc(ldns_pkt *p, bool b);
void ldns_pkt_set_rd(ldns_pkt *p, bool b);
void ldns_pkt_set_cd(ldns_pkt *p, bool b);
void ldns_pkt_set_ra(ldns_pkt *p, bool b);
void ldns_pkt_set_ad(ldns_pkt *p, bool b);
 
void ldns_pkt_set_opcode(ldns_pkt *p, ldns_pkt_opcode c);
void ldns_pkt_set_rcode(ldns_pkt *p, uint8_t c);
void ldns_pkt_set_qdcount(ldns_pkt *p, uint16_t c);
void ldns_pkt_set_ancount(ldns_pkt *p, uint16_t c);
void ldns_pkt_set_nscount(ldns_pkt *p, uint16_t c);
void ldns_pkt_set_arcount(ldns_pkt *p, uint16_t c);
void ldns_pkt_set_answerfrom(ldns_pkt *p, ldns_rdf *r);
void ldns_pkt_set_querytime(ldns_pkt *p, uint32_t t);
void ldns_pkt_set_size(ldns_pkt *p, size_t s);
 
void ldns_pkt_set_timestamp(ldns_pkt *p, struct timeval timeval);
void ldns_pkt_set_section_count(ldns_pkt *p, ldns_pkt_section s, uint16_t x);
void ldns_pkt_set_tsig(ldns_pkt *p, ldns_rr *t);
 
ldns_pkt_type ldns_pkt_reply_type(const ldns_pkt *p);
 
uint16_t ldns_pkt_edns_udp_size(const ldns_pkt *packet);
uint8_t ldns_pkt_edns_extended_rcode(const ldns_pkt *packet);
uint8_t ldns_pkt_edns_version(const ldns_pkt *packet);
uint16_t ldns_pkt_edns_z(const ldns_pkt *packet);
ldns_rdf *ldns_pkt_edns_data(const ldns_pkt *packet);
 
bool ldns_pkt_edns_do(const ldns_pkt *packet);
void ldns_pkt_set_edns_do(ldns_pkt *packet, bool value);
 
bool ldns_pkt_edns(const ldns_pkt *packet);
 
void ldns_pkt_set_edns_udp_size(ldns_pkt *packet, uint16_t s);
void ldns_pkt_set_edns_extended_rcode(ldns_pkt *packet, uint8_t c);
void ldns_pkt_set_edns_version(ldns_pkt *packet, uint8_t v);
void ldns_pkt_set_edns_z(ldns_pkt *packet, uint16_t z);
void ldns_pkt_set_edns_data(ldns_pkt *packet, ldns_rdf *data);
 
ldns_pkt *ldns_pkt_new(void);
 
void ldns_pkt_free(ldns_pkt *packet);
 
ldns_status ldns_pkt_query_new_frm_str(ldns_pkt **p, const char *rr_name, ldns_rr_type rr_type, ldns_rr_class rr_class , uint16_t flags);
 
ldns_status ldns_pkt_ixfr_request_new_frm_str(ldns_pkt **p, const char *rr_name, ldns_rr_class rr_class, uint16_t flags, ldns_rr* soa);
 
ldns_pkt *ldns_pkt_query_new(ldns_rdf *rr_name, ldns_rr_type rr_type, ldns_rr_class rr_class, uint16_t flags);
 
ldns_pkt *ldns_pkt_ixfr_request_new(ldns_rdf *rr_name, ldns_rr_class rr_class, uint16_t flags, ldns_rr* soa);
 
ldns_pkt *ldns_pkt_clone(const ldns_pkt *pkt);
 
void ldns_pkt_set_additional(ldns_pkt *p, ldns_rr_list *rr);
 
void ldns_pkt_set_answer(ldns_pkt *p, ldns_rr_list *rr);
 
void ldns_pkt_set_question(ldns_pkt *p, ldns_rr_list *rr);
 
void ldns_pkt_set_authority(ldns_pkt *p, ldns_rr_list *rr);
 
bool ldns_pkt_push_rr(ldns_pkt *packet, ldns_pkt_section section, ldns_rr *rr);
 
bool ldns_pkt_safe_push_rr(ldns_pkt *pkt, ldns_pkt_section sec, ldns_rr *rr);
 
bool ldns_pkt_push_rr_list(ldns_pkt *packet, ldns_pkt_section section, ldns_rr_list *list);
 
bool ldns_pkt_safe_push_rr_list(ldns_pkt *pkt, ldns_pkt_section sec, ldns_rr_list *list);
 
bool ldns_pkt_empty(ldns_pkt *p);
 
#ifdef __cplusplus
}
#endif
 
#endif  /* LDNS_PACKET_H */