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/* ISC license. */
#ifndef S6DNS_MESSAGE_H
#define S6DNS_MESSAGE_H
#include <stdint.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <s6-dns/s6dns-domain.h>
/* Header */
typedef struct s6dns_message_counts_s s6dns_message_counts_t, *s6dns_message_counts_t_ref ;
struct s6dns_message_counts_s
{
uint16_t qd ;
uint16_t an ;
uint16_t ns ;
uint16_t nr ;
} ;
#define S6DNS_MESSAGE_COUNTS_ZERO { .qd = 0, .an = 0, .ns = 0, .nr = 0 }
extern s6dns_message_counts_t const s6dns_message_counts_zero ;
extern void s6dns_message_counts_pack (char *, s6dns_message_counts_t const *) ;
extern void s6dns_message_counts_unpack (char const *, s6dns_message_counts_t *) ;
extern unsigned int s6dns_message_counts_next (s6dns_message_counts_t *) ;
typedef struct s6dns_message_header_s s6dns_message_header_t, *s6dns_message_header_t_ref ;
struct s6dns_message_header_s
{
uint16_t id ;
unsigned int qr : 1 ;
unsigned int opcode : 4 ;
unsigned int aa : 1 ;
unsigned int tc : 1 ;
unsigned int rd : 1 ;
unsigned int ra : 1 ;
unsigned int z : 3 ;
unsigned int rcode : 4 ;
s6dns_message_counts_t counts ;
} ;
#define S6DNS_MESSAGE_HEADER_ZERO { \
.id = 0, \
.qr = 0, \
.opcode = 0, \
.aa = 0, \
.tc = 0, \
.rd = 0, \
.ra = 0, \
.z = 0, \
.rcode = 0, \
.counts = S6DNS_MESSAGE_COUNTS_ZERO \
}
extern s6dns_message_header_t const s6dns_message_header_zero ;
extern void s6dns_message_header_pack (char *, s6dns_message_header_t const *) ;
extern void s6dns_message_header_unpack (char const *, s6dns_message_header_t *) ;
/* Specific RR helpers */
extern int s6dns_message_get_string (s6dns_domain_t *, char const *, unsigned int, unsigned int *) ;
extern int s6dns_message_get_strings (char *, unsigned int, char const *, unsigned int, unsigned int *) ;
extern int s6dns_message_get_domain (s6dns_domain_t *, char const *, unsigned int, unsigned int *) ;
extern size_t s6dns_message_get_domain_nodecode (char *, size_t, char const *, unsigned int, unsigned int *) ;
typedef struct s6dns_message_rr_hinfo_s s6dns_message_rr_hinfo_t, *s6dns_message_rr_hinfo_t_ref ;
struct s6dns_message_rr_hinfo_s
{
s6dns_domain_t cpu ;
s6dns_domain_t os ;
} ;
extern int s6dns_message_get_hinfo (s6dns_message_rr_hinfo_t *, char const *, unsigned int, unsigned int *) ;
typedef struct s6dns_message_rr_mx_s s6dns_message_rr_mx_t, *s6dns_message_rr_mx_t_ref ;
struct s6dns_message_rr_mx_s
{
uint16_t preference ;
s6dns_domain_t exchange ;
} ;
extern int s6dns_message_get_mx (s6dns_message_rr_mx_t *, char const *, unsigned int, unsigned int *) ;
typedef struct s6dns_message_rr_soa_s s6dns_message_rr_soa_t, *s6dns_message_rr_soa_t_ref ;
struct s6dns_message_rr_soa_s
{
s6dns_domain_t mname ;
s6dns_domain_t rname ;
uint32_t serial ;
uint32_t refresh ;
uint32_t retry ;
uint32_t expire ;
uint32_t minimum ;
} ;
extern int s6dns_message_get_soa (s6dns_message_rr_soa_t *, char const *, unsigned int, unsigned int *) ;
typedef struct s6dns_message_rr_srv_s s6dns_message_rr_srv_t, *s6dns_message_rr_srv_t_ref ;
struct s6dns_message_rr_srv_s
{
uint16_t priority ;
uint16_t weight ;
uint16_t port ;
s6dns_domain_t target ;
} ;
extern int s6dns_message_get_srv (s6dns_message_rr_srv_t *, char const *, unsigned int, unsigned int *) ;
typedef struct s6dns_message_rr_caa_s s6dns_message_rr_caa_t, *s6dns_message_rr_caa_t_ref ;
struct s6dns_message_rr_caa_s
{
uint8_t flags ;
char tag[256] ;
char value[256] ;
} ;
extern int s6dns_message_get_caa (s6dns_message_rr_caa_t *, char const *, unsigned int, unsigned int *, uint16_t) ;
/* The callback function type: how to parse RRs */
typedef struct s6dns_message_rr_s s6dns_message_rr_t, *s6dns_message_rr_t_ref ;
struct s6dns_message_rr_s
{
s6dns_domain_t name ;
uint16_t rtype ;
uint16_t rclass ;
uint32_t ttl ;
uint16_t rdlength ;
} ;
typedef int s6dns_message_rr_func (s6dns_message_rr_t const *, char const *, unsigned int, unsigned int, unsigned int, void *) ;
typedef s6dns_message_rr_func *s6dns_message_rr_func_ref ;
/* mpag: structure to encode several variable-length results */
typedef struct s6dns_mpag_s s6dns_mpag_t, *s6dns_mpag_t_ref ;
struct s6dns_mpag_s
{
stralloc sa ;
genalloc offsets ; /* array of size_t */
uint16_t rtype ;
} ;
#define S6DNS_MPAG_ZERO { .sa = STRALLOC_ZERO, .offsets = GENALLOC_ZERO, .rtype = 0 }
/* dpag: structure for domain lists */
typedef struct s6dns_dpag_s s6dns_dpag_t, *s6dns_dpag_t_ref ;
struct s6dns_dpag_s
{
genalloc ds ; /* array of s6dns_domain_t */
uint16_t rtype ;
} ;
#define S6DNS_DPAG_ZERO { .ds = GENALLOC_ZERO, .rtype = 0 }
extern s6dns_message_rr_func s6dns_message_parse_answer_strings ;
extern s6dns_message_rr_func s6dns_message_parse_answer_domain ;
extern s6dns_message_rr_func s6dns_message_parse_answer_a ;
extern s6dns_message_rr_func s6dns_message_parse_answer_aaaa ;
extern s6dns_message_rr_func s6dns_message_parse_answer_mx ;
extern s6dns_message_rr_func s6dns_message_parse_answer_hinfo ;
extern s6dns_message_rr_func s6dns_message_parse_answer_soa ;
extern s6dns_message_rr_func s6dns_message_parse_answer_srv ;
extern s6dns_message_rr_func s6dns_message_parse_answer_caa ;
/* The actual parsing function */
extern int s6dns_message_parse (s6dns_message_header_t_ref, char const *, unsigned int, s6dns_message_rr_func_ref, void *) ;
/* Internals of this function, for lower level access */
extern int s6dns_message_parse_init (s6dns_message_header_t *, s6dns_message_counts_t_ref, char const *, unsigned int, unsigned int *) ;
extern unsigned int s6dns_message_parse_skipqd (s6dns_message_counts_t *, char const *, unsigned int, unsigned int *) ;
extern int s6dns_message_parse_getrr (s6dns_message_rr_t_ref, char const *, unsigned int, unsigned int *) ;
extern unsigned int s6dns_message_parse_next (s6dns_message_counts_t *, s6dns_message_rr_t const *, char const *, unsigned int, unsigned int *) ;
/* For when you want to write a cache */
extern int s6dns_message_parse_question (s6dns_message_counts_t *, s6dns_domain_t *, uint16_t *, char const *, unsigned int, unsigned int *) ;
#endif
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