1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/* 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"
int ares_parse_srv_reply(const unsigned char *abuf, int alen_int,
struct ares_srv_reply **srv_out)
{
ares_status_t status;
size_t alen;
struct ares_srv_reply *srv_head = NULL;
struct ares_srv_reply *srv_last = NULL;
struct ares_srv_reply *srv_curr;
ares_dns_record_t *dnsrec = NULL;
size_t i;
*srv_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_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);
if (rr == NULL) {
/* Shouldn't be possible */
status = ARES_EBADRESP;
goto done;
}
if (ares_dns_rr_get_class(rr) != ARES_CLASS_IN ||
ares_dns_rr_get_type(rr) != ARES_REC_TYPE_SRV) {
continue;
}
/* Allocate storage for this SRV answer appending it to the list */
srv_curr = ares_malloc_data(ARES_DATATYPE_SRV_REPLY);
if (srv_curr == NULL) {
status = ARES_ENOMEM;
goto done;
}
/* Link in the record */
if (srv_last) {
srv_last->next = srv_curr;
} else {
srv_head = srv_curr;
}
srv_last = srv_curr;
srv_curr->priority = ares_dns_rr_get_u16(rr, ARES_RR_SRV_PRIORITY);
srv_curr->weight = ares_dns_rr_get_u16(rr, ARES_RR_SRV_WEIGHT);
srv_curr->port = ares_dns_rr_get_u16(rr, ARES_RR_SRV_PORT);
srv_curr->host = ares_strdup(ares_dns_rr_get_str(rr, ARES_RR_SRV_TARGET));
if (srv_curr->host == NULL) {
status = ARES_ENOMEM;
goto done;
}
}
done:
/* clean up on error */
if (status != ARES_SUCCESS) {
if (srv_head) {
ares_free_data(srv_head);
}
} else {
/* everything looks fine, return the data */
*srv_out = srv_head;
}
ares_dns_record_destroy(dnsrec);
return (int)status;
}
|
