diff options
Diffstat (limited to 'src/libknot/rrset.c')
| -rw-r--r-- | src/libknot/rrset.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/src/libknot/rrset.c b/src/libknot/rrset.c new file mode 100644 index 0000000..110422f --- /dev/null +++ b/src/libknot/rrset.c @@ -0,0 +1,217 @@ +/* Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#include <assert.h> +#include <stdbool.h> +#include <stdint.h> + +#include "libknot/attribute.h" +#include "libknot/errcode.h" +#include "libknot/rrset.h" +#include "libknot/rrtype/naptr.h" +#include "libknot/rrtype/rrsig.h" +#include "contrib/mempattern.h" + +_public_ +knot_rrset_t *knot_rrset_new(const knot_dname_t *owner, uint16_t type, + uint16_t rclass, uint32_t ttl, knot_mm_t *mm) +{ + knot_dname_t *owner_cpy = knot_dname_copy(owner, mm); + if (owner_cpy == NULL) { + return NULL; + } + + knot_rrset_t *ret = mm_alloc(mm, sizeof(knot_rrset_t)); + if (ret == NULL) { + knot_dname_free(owner_cpy, mm); + return NULL; + } + + knot_rrset_init(ret, owner_cpy, type, rclass, ttl); + + return ret; +} + +_public_ +knot_rrset_t *knot_rrset_copy(const knot_rrset_t *src, knot_mm_t *mm) +{ + if (src == NULL) { + return NULL; + } + + knot_rrset_t *rrset = knot_rrset_new(src->owner, src->type, + src->rclass, src->ttl, mm); + if (rrset == NULL) { + return NULL; + } + + int ret = knot_rdataset_copy(&rrset->rrs, &src->rrs, mm); + if (ret != KNOT_EOK) { + knot_rrset_free(rrset, mm); + return NULL; + } + + return rrset; +} + +_public_ +void knot_rrset_free(knot_rrset_t *rrset, knot_mm_t *mm) +{ + if (rrset == NULL) { + return; + } + + knot_rrset_clear(rrset, mm); + mm_free(mm, rrset); +} + +_public_ +void knot_rrset_clear(knot_rrset_t *rrset, knot_mm_t *mm) +{ + if (rrset == NULL) { + return; + } + + knot_rdataset_clear(&rrset->rrs, mm); + knot_dname_free(rrset->owner, mm); + rrset->owner = NULL; +} + +_public_ +int knot_rrset_add_rdata(knot_rrset_t *rrset, const uint8_t *data, uint16_t len, + knot_mm_t *mm) +{ + if (rrset == NULL || (data == NULL && len > 0)) { + return KNOT_EINVAL; + } + + uint8_t buf[knot_rdata_size(len)]; + knot_rdata_t *rdata = (knot_rdata_t *)buf; + knot_rdata_init(rdata, len, data); + + return knot_rdataset_add(&rrset->rrs, rdata, mm); +} + +_public_ +bool knot_rrset_equal(const knot_rrset_t *r1, + const knot_rrset_t *r2, + bool incl_ttl) +{ + if (r1->type != r2->type || + (incl_ttl && r1->ttl != r2->ttl)) { + return false; + } + + if ((r1->owner != NULL || r2->owner != NULL) && + !knot_dname_is_equal(r1->owner, r2->owner)) { + return false; + } + + return knot_rdataset_eq(&r1->rrs, &r2->rrs); +} + +_public_ +bool knot_rrset_is_nsec3rel(const knot_rrset_t *rr) +{ + if (rr == NULL) { + return false; + } + + /* Is NSEC3 or non-empty RRSIG covering NSEC3. */ + return ((rr->type == KNOT_RRTYPE_NSEC3) || + (rr->type == KNOT_RRTYPE_RRSIG + && knot_rrsig_type_covered(rr->rrs.rdata) == KNOT_RRTYPE_NSEC3)); +} + +_public_ +int knot_rrset_rr_to_canonical(knot_rrset_t *rrset) +{ + if (rrset == NULL || rrset->rrs.count != 1) { + return KNOT_EINVAL; + } + + /* Convert owner for all RRSets. */ + knot_dname_to_lower(rrset->owner); + + /* Convert DNAMEs in RDATA only for RFC4034 types. */ + if (!knot_rrtype_should_be_lowercased(rrset->type)) { + return KNOT_EOK; + } + + const knot_rdata_descriptor_t *desc = knot_get_rdata_descriptor(rrset->type); + if (desc->type_name == NULL) { + desc = knot_get_obsolete_rdata_descriptor(rrset->type); + } + + uint16_t rdlen = rrset->rrs.rdata->len; + uint8_t *pos = rrset->rrs.rdata->data; + uint8_t *endpos = pos + rdlen; + + /* No RDATA */ + if (rdlen == 0) { + return KNOT_EOK; + } + + /* Otherwise, whole and not malformed RDATA are expected. */ + for (int i = 0; desc->block_types[i] != KNOT_RDATA_WF_END; ++i) { + int type = desc->block_types[i]; + switch (type) { + case KNOT_RDATA_WF_COMPRESSIBLE_DNAME: + case KNOT_RDATA_WF_DECOMPRESSIBLE_DNAME: + case KNOT_RDATA_WF_FIXED_DNAME: + knot_dname_to_lower(pos); + pos += knot_dname_size(pos); + break; + case KNOT_RDATA_WF_NAPTR_HEADER: + ; int ret = knot_naptr_header_size(pos, endpos); + if (ret < 0) { + return ret; + } + + pos += ret; + break; + case KNOT_RDATA_WF_REMAINDER: + break; + default: + /* Fixed size block */ + assert(type > 0); + pos += type; + } + } + + return KNOT_EOK; +} + +_public_ +size_t knot_rrset_size(const knot_rrset_t *rrset) +{ + if (rrset == NULL) { + return 0; + } + + uint16_t rr_count = rrset->rrs.count; + + size_t total_size = knot_dname_size(rrset->owner) * rr_count; + + knot_rdata_t *rr = rrset->rrs.rdata; + for (size_t i = 0; i < rr_count; ++i) { + /* 10B = TYPE + CLASS + TTL + RDLENGTH */ + total_size += rr->len + 10; + rr = knot_rdataset_next(rr); + } + + return total_size; +} |