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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_private.h"
#include "ares_data.h"
int ares_parse_soa_reply(const unsigned char *abuf, int alen_int,
struct ares_soa_reply **soa_out)
{
ares_status_t status;
size_t alen;
struct ares_soa_reply *soa = NULL;
ares_dns_record_t *dnsrec = NULL;
size_t i;
*soa_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_EBADRESP; /* ENODATA might make more sense */
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);
if (rr == NULL) {
/* Shouldn't be possible */
status = ARES_EBADRESP; /* LCOV_EXCL_LINE: DefensiveCoding */
goto done; /* LCOV_EXCL_LINE: DefensiveCoding */
}
if (ares_dns_rr_get_class(rr) != ARES_CLASS_IN ||
ares_dns_rr_get_type(rr) != ARES_REC_TYPE_SOA) {
continue;
}
/* allocate result struct */
soa = ares_malloc_data(ARES_DATATYPE_SOA_REPLY);
if (soa == NULL) {
status = ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
goto done; /* LCOV_EXCL_LINE: OutOfMemory */
}
soa->serial = ares_dns_rr_get_u32(rr, ARES_RR_SOA_SERIAL);
soa->refresh = ares_dns_rr_get_u32(rr, ARES_RR_SOA_REFRESH);
soa->retry = ares_dns_rr_get_u32(rr, ARES_RR_SOA_RETRY);
soa->expire = ares_dns_rr_get_u32(rr, ARES_RR_SOA_EXPIRE);
soa->minttl = ares_dns_rr_get_u32(rr, ARES_RR_SOA_MINIMUM);
soa->nsname = ares_strdup(ares_dns_rr_get_str(rr, ARES_RR_SOA_MNAME));
if (soa->nsname == NULL) {
status = ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
goto done; /* LCOV_EXCL_LINE: OutOfMemory */
}
soa->hostmaster = ares_strdup(ares_dns_rr_get_str(rr, ARES_RR_SOA_RNAME));
if (soa->hostmaster == NULL) {
status = ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
goto done; /* LCOV_EXCL_LINE: OutOfMemory */
}
break;
}
if (soa == NULL) {
status = ARES_EBADRESP;
}
done:
/* clean up on error */
if (status != ARES_SUCCESS) {
ares_free_data(soa);
/* Compatibility */
if (status == ARES_EBADNAME) {
status = ARES_EBADRESP;
}
} else {
/* everything looks fine, return the data */
*soa_out = soa;
}
ares_dns_record_destroy(dnsrec);
return (int)status;
}
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