1 /* MIT License
2 *
3 * Copyright (c) 2023 Brad House
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 *
24 * SPDX-License-Identifier: MIT
25 */
26 #include "ares_private.h"
27 #include "ares_data.h"
28
ares_parse_naptr_reply(const unsigned char * abuf,int alen_int,struct ares_naptr_reply ** naptr_out)29 int ares_parse_naptr_reply(const unsigned char *abuf, int alen_int,
30 struct ares_naptr_reply **naptr_out)
31 {
32 ares_status_t status;
33 size_t alen;
34 struct ares_naptr_reply *naptr_head = NULL;
35 struct ares_naptr_reply *naptr_last = NULL;
36 struct ares_naptr_reply *naptr_curr;
37 ares_dns_record_t *dnsrec = NULL;
38 size_t i;
39
40 *naptr_out = NULL;
41
42 if (alen_int < 0) {
43 return ARES_EBADRESP;
44 }
45
46 alen = (size_t)alen_int;
47
48 status = ares_dns_parse(abuf, alen, 0, &dnsrec);
49 if (status != ARES_SUCCESS) {
50 goto done;
51 }
52
53 if (ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER) == 0) {
54 status = ARES_ENODATA;
55 goto done;
56 }
57
58 for (i = 0; i < ares_dns_record_rr_cnt(dnsrec, ARES_SECTION_ANSWER); i++) {
59 const ares_dns_rr_t *rr =
60 ares_dns_record_rr_get(dnsrec, ARES_SECTION_ANSWER, i);
61
62 if (rr == NULL) {
63 /* Shouldn't be possible */
64 status = ARES_EBADRESP; /* LCOV_EXCL_LINE: DefensiveCoding */
65 goto done; /* LCOV_EXCL_LINE: DefensiveCoding */
66 }
67
68 if (ares_dns_rr_get_class(rr) != ARES_CLASS_IN ||
69 ares_dns_rr_get_type(rr) != ARES_REC_TYPE_NAPTR) {
70 continue;
71 }
72
73 /* Allocate storage for this NAPTR answer appending it to the list */
74 naptr_curr = ares_malloc_data(ARES_DATATYPE_NAPTR_REPLY);
75 if (naptr_curr == NULL) {
76 status = ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
77 goto done; /* LCOV_EXCL_LINE: OutOfMemory */
78 }
79
80 /* Link in the record */
81 if (naptr_last) {
82 naptr_last->next = naptr_curr;
83 } else {
84 naptr_head = naptr_curr;
85 }
86 naptr_last = naptr_curr;
87
88 naptr_curr->order = ares_dns_rr_get_u16(rr, ARES_RR_NAPTR_ORDER);
89 naptr_curr->preference = ares_dns_rr_get_u16(rr, ARES_RR_NAPTR_PREFERENCE);
90
91 /* XXX: Why is this unsigned char * ? */
92 naptr_curr->flags = (unsigned char *)ares_strdup(
93 ares_dns_rr_get_str(rr, ARES_RR_NAPTR_FLAGS));
94 if (naptr_curr->flags == NULL) {
95 status = ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
96 goto done; /* LCOV_EXCL_LINE: OutOfMemory */
97 }
98 /* XXX: Why is this unsigned char * ? */
99 naptr_curr->service = (unsigned char *)ares_strdup(
100 ares_dns_rr_get_str(rr, ARES_RR_NAPTR_SERVICES));
101 if (naptr_curr->service == NULL) {
102 status = ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
103 goto done; /* LCOV_EXCL_LINE: OutOfMemory */
104 }
105 /* XXX: Why is this unsigned char * ? */
106 naptr_curr->regexp = (unsigned char *)ares_strdup(
107 ares_dns_rr_get_str(rr, ARES_RR_NAPTR_REGEXP));
108 if (naptr_curr->regexp == NULL) {
109 status = ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
110 goto done; /* LCOV_EXCL_LINE: OutOfMemory */
111 }
112 naptr_curr->replacement =
113 ares_strdup(ares_dns_rr_get_str(rr, ARES_RR_NAPTR_REPLACEMENT));
114 if (naptr_curr->replacement == NULL) {
115 status = ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
116 goto done; /* LCOV_EXCL_LINE: OutOfMemory */
117 }
118 }
119
120 done:
121 /* clean up on error */
122 if (status != ARES_SUCCESS) {
123 if (naptr_head) {
124 ares_free_data(naptr_head);
125 }
126 } else {
127 /* everything looks fine, return the data */
128 *naptr_out = naptr_head;
129 }
130 ares_dns_record_destroy(dnsrec);
131 return (int)status;
132 }
133