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/* MIT License
*
* Copyright (c) 2023 Brad House
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
#include "ares_setup.h"
#include "ares.h"
#include "ares_data.h"
#include "ares_private.h"
int ares_parse_caa_reply(const unsigned char *abuf, int alen_int,
struct ares_caa_reply **caa_out)
{
ares_status_t status;
size_t alen;
struct ares_caa_reply *caa_head = NULL;
struct ares_caa_reply *caa_last = NULL;
struct ares_caa_reply *caa_curr;
ares_dns_record_t *dnsrec = NULL;
size_t i;
*caa_out = NULL;
if (alen_int < 0) {
return ARES_EBADRESP;
}
alen = (size_t)alen_int;
status = ares_dns_parse(abuf, alen, 0, &dnsrec);
if (status != ARES_SUCCESS) {
goto done;
}
if (ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER) == 0) {
status = ARES_ENODATA;
goto done;
}
for (i = 0; i < ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER); i++) {
const unsigned char *ptr;
size_t ptr_len;
const ares_dns_rr_t *rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
if (rr == NULL) {
/* Shouldn't be possible */
status = ARES_EBADRESP;
goto done;
}
/* XXX: Why do we allow Chaos class? */
if (ares_dns_rr_get_class(rr) != ARES_CLASS_IN &&
ares_dns_rr_get_class(rr) != ARES_CLASS_CHAOS) {
continue;
}
/* Only looking for CAA records */
if (ares_dns_rr_get_type(rr) != ARES_REC_TYPE_CAA) {
continue;
}
/* Allocate storage for this CAA answer appending it to the list */
caa_curr = ares_malloc_data(ARES_DATATYPE_CAA_REPLY);
if (caa_curr == NULL) {
status = ARES_ENOMEM;
goto done;
}
/* Link in the record */
if (caa_last) {
caa_last->next = caa_curr;
} else {
caa_head = caa_curr;
}
caa_last = caa_curr;
caa_curr->critical = ares_dns_rr_get_u8(rr, ARES_RR_CAA_CRITICAL);
caa_curr->property =
(unsigned char *)ares_strdup(ares_dns_rr_get_str(rr, ARES_RR_CAA_TAG));
if (caa_curr->property == NULL) {
status = ARES_ENOMEM;
break;
}
/* RFC6844 says this can only be ascii, so not sure why we're recording a
* length */
caa_curr->plength = ares_strlen((const char *)caa_curr->property);
ptr = ares_dns_rr_get_bin(rr, ARES_RR_CAA_VALUE, &ptr_len);
if (ptr == NULL) {
status = ARES_EBADRESP;
goto done;
}
/* Wants NULL termination for some reason */
caa_curr->value = ares_malloc(ptr_len + 1);
if (caa_curr->value == NULL) {
status = ARES_ENOMEM;
goto done;
}
memcpy(caa_curr->value, ptr, ptr_len);
caa_curr->value[ptr_len] = 0;
caa_curr->length = ptr_len;
}
done:
/* clean up on error */
if (status != ARES_SUCCESS) {
if (caa_head) {
ares_free_data(caa_head);
}
} else {
/* everything looks fine, return the data */
*caa_out = caa_head;
}
ares_dns_record_destroy(dnsrec);
return (int)status;
}
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