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/* MIT License
*
* Copyright (c) 1998 Massachusetts Institute of Technology
* Copyright (c) The c-ares project and its contributors
*
* 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
#include "ares_nameser.h"
#include "ares.h"
#include "ares_dns.h"
#include "ares_private.h"
typedef struct {
ares_callback_dnsrec callback;
void *arg;
} ares_query_dnsrec_arg_t;
static void ares_query_dnsrec_cb(void *arg, ares_status_t status,
size_t timeouts,
const ares_dns_record_t *dnsrec)
{
ares_query_dnsrec_arg_t *qquery = arg;
if (status != ARES_SUCCESS) {
qquery->callback(qquery->arg, status, timeouts, dnsrec);
} else {
size_t ancount;
ares_dns_rcode_t rcode;
/* Pull the response code and answer count from the packet and convert any
* errors.
*/
rcode = ares_dns_record_get_rcode(dnsrec);
ancount = ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER);
status = ares_dns_query_reply_tostatus(rcode, ancount);
qquery->callback(qquery->arg, status, timeouts, dnsrec);
}
ares_free(qquery);
}
static ares_status_t ares_query_int(ares_channel_t *channel, const char *name,
ares_dns_class_t dnsclass,
ares_dns_rec_type_t type,
ares_callback_dnsrec callback, void *arg,
unsigned short *qid)
{
ares_status_t status;
ares_dns_record_t *dnsrec = NULL;
ares_dns_flags_t flags = 0;
ares_query_dnsrec_arg_t *qquery = NULL;
if (channel == NULL || name == NULL || callback == NULL) {
status = ARES_EFORMERR;
if (callback != NULL) {
callback(arg, status, 0, NULL);
}
return status;
}
if (!(channel->flags & ARES_FLAG_NORECURSE)) {
flags |= ARES_FLAG_RD;
}
status = ares_dns_record_create_query(
&dnsrec, name, dnsclass, type, 0, flags,
(size_t)(channel->flags & ARES_FLAG_EDNS) ? channel->ednspsz : 0);
if (status != ARES_SUCCESS) {
callback(arg, status, 0, NULL);
return status;
}
qquery = ares_malloc(sizeof(*qquery));
if (qquery == NULL) {
status = ARES_ENOMEM;
callback(arg, status, 0, NULL);
ares_dns_record_destroy(dnsrec);
return status;
}
qquery->callback = callback;
qquery->arg = arg;
/* Send it off. qcallback will be called when we get an answer. */
status = ares_send_dnsrec(channel, dnsrec, ares_query_dnsrec_cb, qquery, qid);
ares_dns_record_destroy(dnsrec);
return status;
}
ares_status_t ares_query_dnsrec(ares_channel_t *channel, const char *name,
ares_dns_class_t dnsclass,
ares_dns_rec_type_t type,
ares_callback_dnsrec callback, void *arg,
unsigned short *qid)
{
ares_status_t status;
if (channel == NULL) {
return ARES_EFORMERR;
}
ares__channel_lock(channel);
status = ares_query_int(channel, name, dnsclass, type, callback, arg, qid);
ares__channel_unlock(channel);
return status;
}
void ares_query(ares_channel_t *channel, const char *name, int dnsclass,
int type, ares_callback callback, void *arg)
{
void *carg = NULL;
if (channel == NULL) {
return;
}
carg = ares__dnsrec_convert_arg(callback, arg);
if (carg == NULL) {
callback(arg, ARES_ENOMEM, 0, NULL, 0);
return;
}
ares_query_dnsrec(channel, name, (ares_dns_class_t)dnsclass,
(ares_dns_rec_type_t)type, ares__dnsrec_convert_cb, carg,
NULL);
}
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