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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/* 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_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
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; /* LCOV_EXCL_LINE: DefensiveCoding */
}
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; /* LCOV_EXCL_LINE: OutOfMemory */
goto done; /* LCOV_EXCL_LINE: OutOfMemory */
}
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; /* LCOV_EXCL_LINE: OutOfMemory */
goto done; /* LCOV_EXCL_LINE: OutOfMemory */
}
cname->name = ares_strdup(hostname);
if (cname->name == NULL) {
status = ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
goto done; /* LCOV_EXCL_LINE: OutOfMemory */
}
} 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; /* LCOV_EXCL_LINE: OutOfMemory */
}
} 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; /* LCOV_EXCL_LINE: OutOfMemory */
}
} 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; /* LCOV_EXCL_LINE: OutOfMemory */
goto done; /* LCOV_EXCL_LINE: OutOfMemory */
}
}
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;
}
|
