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/* MIT License
*
* Copyright (c) 1998 Massachusetts Institute of Technology
* Copyright (c) 2019 Andrew Selivanov
*
* 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"
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
# include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
int ares_parse_a_reply(const unsigned char *abuf, int alen,
struct hostent **host, struct ares_addrttl *addrttls,
int *naddrttls)
{
struct ares_addrinfo ai;
char *question_hostname = NULL;
ares_status_t status;
size_t req_naddrttls = 0;
ares_dns_record_t *dnsrec = NULL;
if (alen < 0) {
return ARES_EBADRESP;
}
if (naddrttls) {
req_naddrttls = (size_t)*naddrttls;
*naddrttls = 0;
}
memset(&ai, 0, sizeof(ai));
status = ares_dns_parse(abuf, (size_t)alen, 0, &dnsrec);
if (status != ARES_SUCCESS) {
goto fail;
}
status = ares__parse_into_addrinfo(dnsrec, 0, 0, &ai);
if (status != ARES_SUCCESS && status != ARES_ENODATA) {
goto fail;
}
if (host != NULL) {
status = ares__addrinfo2hostent(&ai, AF_INET, host);
if (status != ARES_SUCCESS && status != ARES_ENODATA) {
goto fail; /* LCOV_EXCL_LINE: DefensiveCoding */
}
}
if (addrttls != NULL && req_naddrttls) {
size_t temp_naddrttls = 0;
ares__addrinfo2addrttl(&ai, AF_INET, req_naddrttls, addrttls, NULL,
&temp_naddrttls);
*naddrttls = (int)temp_naddrttls;
}
fail:
ares__freeaddrinfo_cnames(ai.cnames);
ares__freeaddrinfo_nodes(ai.nodes);
ares_free(ai.name);
ares_free(question_hostname);
ares_dns_record_destroy(dnsrec);
if (status == ARES_EBADNAME) {
status = ARES_EBADRESP;
}
return (int)status;
}
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