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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"
#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 DNSSEC_OK_MASK 0x8000U /* do bit mask */
struct edns_data
{
char ok[OPT_LEN];
char error[OPT_LEN];
char rdata_none[OPT_RDATA];
char rdata_nsid[OPT_RDATA];
char nsid[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;
struct edns_record
{
edns_status_type status;
size_t position;
size_t maxlen;
int dnssec_ok;
int nsid;
};
typedef struct edns_record edns_record_type;
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);
/*
* 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);
#endif /* _EDNS_H_ */
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