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rdataslab.h
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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 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 */ 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 */ 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 */