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/*
* edns.h -- EDNS definitions (RFC 2671).
*
* Copyright (c) 2001-2006, NLnet Labs. All rights reserved.
*
* See LICENSE for the license.
*
*/
#ifndef EDNS_H
#define EDNS_H
#include "buffer.h"
struct nsd;
struct query;
#define OPT_LEN 9U /* Length of the NSD EDNS response record minus 2 */
#define OPT_RDATA 2 /* holds the rdata length comes after OPT_LEN */
#define OPT_HDR 4U /* NSID opt header length */
#define NSID_CODE 3 /* nsid option code */
#define COOKIE_CODE 10 /* COOKIE option code */
#define EDE_CODE 15 /* Extended DNS Errors option code */
#define DNSSEC_OK_MASK 0x8000U /* do bit mask */
struct edns_data
{
char ok[OPT_LEN];
char error[OPT_LEN];
char rdata_none[OPT_RDATA];
char nsid[OPT_HDR];
char cookie[OPT_HDR];
};
typedef struct edns_data edns_data_type;
enum edns_status
{
EDNS_NOT_PRESENT,
EDNS_OK,
/* EDNS states may be extended in the future */
EDNS_ERROR
};
typedef enum edns_status edns_status_type;
enum cookie_status
{
COOKIE_NOT_PRESENT,
COOKIE_UNVERIFIED,
COOKIE_VALID,
COOKIE_VALID_REUSE,
COOKIE_INVALID
};
typedef enum cookie_status cookie_status_type;
struct edns_record
{
edns_status_type status;
size_t position;
size_t maxlen;
size_t opt_reserved_space;
int dnssec_ok;
int nsid;
cookie_status_type cookie_status;
size_t cookie_len;
uint8_t cookie[40];
int ede; /* RFC 8914 - Extended DNS Errors */
char* ede_text; /* RFC 8914 - Extended DNS Errors text*/
uint16_t ede_text_len;
};
typedef struct edns_record edns_record_type;
/* The Extended DNS Error codes (RFC8914) we use */
#define EDE_OTHER 0
#define EDE_NOT_READY 14
#define EDE_PROHIBITED 18
#define EDE_NOT_AUTHORITATIVE 20
#define EDE_NOT_SUPPORTED 21
#define EDE_INVALID_DATA 24
/* ASSIGN_EDE_CODE_AND_STRING_LITERAL may only be used with string literals.
* This is guaranteed by concatenating and empty string to LITERAL, which
* will make compilation fail if this macro is used with variables.
*/
#define ASSIGN_EDE_CODE_AND_STRING_LITERAL(EDE, CODE, LITERAL) \
do { \
EDE = (CODE); \
EDE ## _text = (LITERAL ""); \
EDE ## _text_len = sizeof(LITERAL) - 1; \
} while (0)
void edns_init_data(edns_data_type *data, uint16_t max_length);
void edns_init_record(edns_record_type *data);
int edns_parse_record(edns_record_type *data, buffer_type *packet,
struct query* q, struct nsd* nsd);
/*
* The amount of space to reserve in the response for the EDNS data
* (if required).
*/
size_t edns_reserved_space(edns_record_type *data);
void edns_init_nsid(edns_data_type *data, uint16_t nsid_len);
void cookie_verify(struct query *q, struct nsd* nsd, uint32_t *now_p);
void cookie_create(struct query *q, struct nsd* nsd, uint32_t *now_p);
#endif /* EDNS_H */
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