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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"
static int ares__parse_txt_reply(const unsigned char *abuf, size_t alen,
ares_bool_t ex, void **txt_out)
{
ares_status_t status;
struct ares_txt_ext *txt_head = NULL;
struct ares_txt_ext *txt_last = NULL;
struct ares_txt_ext *txt_curr;
ares_dns_record_t *dnsrec = NULL;
size_t i;
*txt_out = NULL;
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 ares_dns_rr_t *rr =
ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
const unsigned char *ptr;
size_t ptr_len;
if (rr == NULL) {
/* Shouldn't be possible */
status = ARES_EBADRESP;
goto done;
}
/* XXX: Why Chaos? */
if ((ares_dns_rr_get_class(rr) != ARES_CLASS_IN &&
ares_dns_rr_get_class(rr) != ARES_CLASS_CHAOS) ||
ares_dns_rr_get_type(rr) != ARES_REC_TYPE_TXT) {
continue;
}
/* Allocate storage for this TXT answer appending it to the list */
txt_curr =
ares_malloc_data(ex ? ARES_DATATYPE_TXT_EXT : ARES_DATATYPE_TXT_REPLY);
if (txt_curr == NULL) {
status = ARES_ENOMEM;
goto done;
}
/* Link in the record */
if (txt_last) {
txt_last->next = txt_curr;
} else {
txt_head = txt_curr;
}
txt_last = txt_curr;
/* These days, records are joined, always tag as start */
if (ex) {
txt_curr->record_start = 1;
}
ptr = ares_dns_rr_get_bin(rr, ARES_RR_TXT_DATA, &ptr_len);
txt_curr->txt = ares_malloc(ptr_len + 1);
if (txt_curr->txt == NULL) {
status = ARES_ENOMEM;
goto done;
}
memcpy(txt_curr->txt, ptr, ptr_len);
txt_curr->txt[ptr_len] = 0;
txt_curr->length = ptr_len;
}
done:
/* clean up on error */
if (status != ARES_SUCCESS) {
if (txt_head) {
ares_free_data(txt_head);
}
} else {
/* everything looks fine, return the data */
*txt_out = txt_head;
}
ares_dns_record_destroy(dnsrec);
return (int)status;
}
int ares_parse_txt_reply(const unsigned char *abuf, int alen,
struct ares_txt_reply **txt_out)
{
if (alen < 0) {
return ARES_EBADRESP;
}
return ares__parse_txt_reply(abuf, (size_t)alen, ARES_FALSE,
(void **)txt_out);
}
int ares_parse_txt_reply_ext(const unsigned char *abuf, int alen,
struct ares_txt_ext **txt_out)
{
if (alen < 0) {
return ARES_EBADRESP;
}
return ares__parse_txt_reply(abuf, (size_t)alen, ARES_TRUE, (void **)txt_out);
}
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