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/* MIT License
*
* Copyright (c) 2019 Andrew Selivanov
* 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"
#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
#include "ares.h"
#include "ares_private.h"
ares_status_t ares__parse_into_addrinfo(const ares_dns_record_t *dnsrec,
ares_bool_t cname_only_is_enodata,
unsigned short port,
struct ares_addrinfo *ai)
{
ares_status_t status;
size_t i;
size_t ancount;
const char *hostname = NULL;
ares_bool_t got_a = ARES_FALSE;
ares_bool_t got_aaaa = ARES_FALSE;
ares_bool_t got_cname = ARES_FALSE;
struct ares_addrinfo_cname *cnames = NULL;
struct ares_addrinfo_node *nodes = NULL;
/* Save question hostname */
status = ares_dns_record_query_get(dnsrec, 0, &hostname, NULL, NULL);
if (status != ARES_SUCCESS) {
goto done;
}
ancount = ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER);
if (ancount == 0) {
status = ARES_ENODATA;
goto done;
}
for (i = 0; i < ancount; i++) {
ares_dns_rec_type_t rtype;
const ares_dns_rr_t *rr =
ares_dns_record_rr_get_const(dnsrec, ARES_SECTION_ANSWER, i);
if (ares_dns_rr_get_class(rr) != ARES_CLASS_IN) {
continue;
}
rtype = ares_dns_rr_get_type(rr);
/* Issue #683
* Old code did this hostname sanity check, however it appears this is
* flawed logic. Other resolvers don't do this sanity check. Leaving
* this code commented out for future reference.
*
* rname = ares_dns_rr_get_name(rr);
* if ((rtype == ARES_REC_TYPE_A || rtype == ARES_REC_TYPE_AAAA) &&
* strcasecmp(rname, hostname) != 0) {
* continue;
* }
*/
if (rtype == ARES_REC_TYPE_CNAME) {
struct ares_addrinfo_cname *cname;
got_cname = ARES_TRUE;
/* replace hostname with data from cname
* SA: Seems wrong as it introduces order dependency. */
hostname = ares_dns_rr_get_str(rr, ARES_RR_CNAME_CNAME);
cname = ares__append_addrinfo_cname(&cnames);
if (cname == NULL) {
status = ARES_ENOMEM;
goto done;
}
cname->ttl = (int)ares_dns_rr_get_ttl(rr);
cname->alias = ares_strdup(ares_dns_rr_get_name(rr));
if (cname->alias == NULL) {
status = ARES_ENOMEM;
goto done;
}
cname->name = ares_strdup(hostname);
if (cname->name == NULL) {
status = ARES_ENOMEM;
goto done;
}
} else if (rtype == ARES_REC_TYPE_A) {
got_a = ARES_TRUE;
status =
ares_append_ai_node(AF_INET, port, ares_dns_rr_get_ttl(rr),
ares_dns_rr_get_addr(rr, ARES_RR_A_ADDR), &nodes);
if (status != ARES_SUCCESS) {
goto done;
}
} else if (rtype == ARES_REC_TYPE_AAAA) {
got_aaaa = ARES_TRUE;
status = ares_append_ai_node(AF_INET6, port, ares_dns_rr_get_ttl(rr),
ares_dns_rr_get_addr6(rr, ARES_RR_AAAA_ADDR),
&nodes);
if (status != ARES_SUCCESS) {
goto done;
}
} else {
continue;
}
}
if (!got_a && !got_aaaa &&
(!got_cname || (got_cname && cname_only_is_enodata))) {
status = ARES_ENODATA;
goto done;
}
/* save the hostname as ai->name */
if (ai->name == NULL || strcasecmp(ai->name, hostname) != 0) {
ares_free(ai->name);
ai->name = ares_strdup(hostname);
if (ai->name == NULL) {
status = ARES_ENOMEM;
goto done;
}
}
if (got_a || got_aaaa) {
ares__addrinfo_cat_nodes(&ai->nodes, nodes);
nodes = NULL;
}
if (got_cname) {
ares__addrinfo_cat_cnames(&ai->cnames, cnames);
cnames = NULL;
}
done:
ares__freeaddrinfo_cnames(cnames);
ares__freeaddrinfo_nodes(nodes);
/* compatibility */
if (status == ARES_EBADNAME) {
status = ARES_EBADRESP;
}
return status;
}
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