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/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * 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 http://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 <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 / void dns_rdataslab_tordataset(unsigned char slab, unsigned int reservelen, dns_rdataclass_t rdclass, dns_rdatatype_t rdtype, dns_rdatatype_t covers, dns_ttl_t ttl, dns_rdataset_t rdataset); /%< Construct an rdataset from a slab. * * Requires: \li 'slab' points to a slab. \li 'rdataset' is disassociated. * * Ensures: \li 'rdataset' is associated and points to a valid rdataest. / 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_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 / isc_boolean_t 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 ISC_TRUE if the slabs are equal, ISC_FALSE otherwise. / isc_boolean_t 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 ISC_TRUE if the slabs are equal, #ISC_FALSE otherwise. / ISC_LANG_ENDDECLS #endif /* DNS_RDATASLAB_H */

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