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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef DNS_RDATASLAB_H
#define DNS_RDATASLAB_H 1
/*! \file dns/rdataslab.h
* \brief
* Implements storage of rdatasets into slabs of memory.
*
* MP:
*\li Clients of this module must impose any required synchronization.
*
* Reliability:
*\li This module deals with low-level byte streams. Errors in any of
* the functions are likely to crash the server or corrupt memory.
*
*\li If the caller passes invalid memory references, these functions are
* likely to crash the server or corrupt memory.
*
* Resources:
*\li None.
*
* Security:
*\li None.
*
* Standards:
*\li None.
*/
/***
*** Imports
***/
#include <stdbool.h>
#include <isc/lang.h>
#include <dns/types.h>
ISC_LANG_BEGINDECLS
#define DNS_RDATASLAB_FORCE 0x1
#define DNS_RDATASLAB_EXACT 0x2
#define DNS_RDATASLAB_OFFLINE 0x01 /* RRSIG is for offline DNSKEY */
#define DNS_RDATASLAB_WARNMASK \
0x0E /*%< RRSIG(DNSKEY) expired \
* warnings number mask. */
#define DNS_RDATASLAB_WARNSHIFT \
1 /*%< How many bits to shift to find \
* remaining expired warning number. */
/***
*** Functions
***/
isc_result_t
dns_rdataslab_fromrdataset(dns_rdataset_t *rdataset, isc_mem_t *mctx,
isc_region_t *region, unsigned int reservelen);
/*%<
* Slabify a rdataset. The slab area will be allocated and returned
* in 'region'.
*
* Requires:
*\li 'rdataset' is valid.
*
* Ensures:
*\li 'region' will have base pointing to the start of allocated memory,
* with the slabified region beginning at region->base + reservelen.
* region->length contains the total length allocated.
*
* Returns:
*\li ISC_R_SUCCESS - successful completion
*\li ISC_R_NOMEMORY - no memory.
*\li XXX others
*/
unsigned int
dns_rdataslab_size(unsigned char *slab, unsigned int reservelen);
/*%<
* Return the total size of an rdataslab.
*
* Requires:
*\li 'slab' points to a slab.
*
* Returns:
*\li The number of bytes in the slab, including the reservelen.
*/
unsigned int
dns_rdataslab_rdatasize(unsigned char *slab, unsigned int reservelen);
/*%<
* Return the size of the rdata in an rdataslab.
*
* Requires:
*\li 'slab' points to a slab.
*/
unsigned int
dns_rdataslab_count(unsigned char *slab, unsigned int reservelen);
/*%<
* Return the number of records in the rdataslab
*
* Requires:
*\li 'slab' points to a slab.
*
* Returns:
*\li The number of records in the slab.
*/
isc_result_t
dns_rdataslab_merge(unsigned char *oslab, unsigned char *nslab,
unsigned int reservelen, isc_mem_t *mctx,
dns_rdataclass_t rdclass, dns_rdatatype_t type,
unsigned int flags, unsigned char **tslabp);
/*%<
* Merge 'oslab' and 'nslab'.
*/
isc_result_t
dns_rdataslab_subtract(unsigned char *mslab, unsigned char *sslab,
unsigned int reservelen, isc_mem_t *mctx,
dns_rdataclass_t rdclass, dns_rdatatype_t type,
unsigned int flags, unsigned char **tslabp);
/*%<
* Subtract 'sslab' from 'mslab'. If 'exact' is true then all elements
* of 'sslab' must exist in 'mslab'.
*
* XXX
* valid flags are DNS_RDATASLAB_EXACT
*/
bool
dns_rdataslab_equal(unsigned char *slab1, unsigned char *slab2,
unsigned int reservelen);
/*%<
* Compare two rdataslabs for equality. This does _not_ do a full
* DNSSEC comparison.
*
* Requires:
*\li 'slab1' and 'slab2' point to slabs.
*
* Returns:
*\li true if the slabs are equal, false otherwise.
*/
bool
dns_rdataslab_equalx(unsigned char *slab1, unsigned char *slab2,
unsigned int reservelen, dns_rdataclass_t rdclass,
dns_rdatatype_t type);
/*%<
* Compare two rdataslabs for DNSSEC equality.
*
* Requires:
*\li 'slab1' and 'slab2' point to slabs.
*
* Returns:
*\li true if the slabs are equal, #false otherwise.
*/
ISC_LANG_ENDDECLS
#endif /* DNS_RDATASLAB_H */
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