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/* Copyright (C) 2018 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 <http://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,
knot_rrset_compare_type_t cmp)
{
if (cmp == KNOT_RRSET_COMPARE_PTR) {
return r1 == r2;
}
if (r1->type != r2->type) {
return false;
}
if (r1->owner && r2->owner) {
if (!knot_dname_is_equal(r1->owner, r2->owner)) {
return false;
}
} else if (r1->owner != r2->owner) { // At least one is NULL.
return false;
}
if (cmp == KNOT_RRSET_COMPARE_WHOLE) {
return knot_rdataset_eq(&r1->rrs, &r2->rrs);
}
return true;
}
_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;
}
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