1
2 /* Copyright 1998 by the Massachusetts Institute of Technology.
3 * Copyright (C) 2019 by Andrew Selivanov
4 *
5 * Permission to use, copy, modify, and distribute this
6 * software and its documentation for any purpose and without
7 * fee is hereby granted, provided that the above copyright
8 * notice appear in all copies and that both that copyright
9 * notice and this permission notice appear in supporting
10 * documentation, and that the name of M.I.T. not be used in
11 * advertising or publicity pertaining to distribution of the
12 * software without specific, written prior permission.
13 * M.I.T. makes no representations about the suitability of
14 * this software for any purpose. It is provided "as is"
15 * without express or implied warranty.
16 */
17
18 #include "ares_setup.h"
19
20 #ifdef HAVE_NETINET_IN_H
21 # include <netinet/in.h>
22 #endif
23 #ifdef HAVE_NETDB_H
24 # include <netdb.h>
25 #endif
26 #ifdef HAVE_ARPA_INET_H
27 # include <arpa/inet.h>
28 #endif
29
30 #include "ares_nameser.h"
31
32 #ifdef HAVE_STRINGS_H
33 # include <strings.h>
34 #endif
35
36 #ifdef HAVE_LIMITS_H
37 # include <limits.h>
38 #endif
39
40 #include "ares.h"
41 #include "ares_dns.h"
42 #include "ares_private.h"
43
ares_parse_a_reply(const unsigned char * abuf,int alen,struct hostent ** host,struct ares_addrttl * addrttls,int * naddrttls)44 int ares_parse_a_reply(const unsigned char *abuf, int alen,
45 struct hostent **host, struct ares_addrttl *addrttls,
46 int *naddrttls)
47 {
48 struct ares_addrinfo ai;
49 char *question_hostname = NULL;
50 int status;
51 int req_naddrttls = 0;
52
53 if (naddrttls)
54 {
55 req_naddrttls = *naddrttls;
56 *naddrttls = 0;
57 }
58
59 memset(&ai, 0, sizeof(ai));
60
61 status = ares__parse_into_addrinfo(abuf, alen, 0, 0, &ai);
62 if (status != ARES_SUCCESS && status != ARES_ENODATA)
63 {
64 goto fail;
65 }
66
67 if (host != NULL)
68 {
69 status = ares__addrinfo2hostent(&ai, AF_INET, host);
70 if (status != ARES_SUCCESS && status != ARES_ENODATA)
71 {
72 goto fail;
73 }
74 }
75
76 if (addrttls != NULL && req_naddrttls)
77 {
78 ares__addrinfo2addrttl(&ai, AF_INET, req_naddrttls, addrttls,
79 NULL, naddrttls);
80 }
81
82
83 fail:
84 ares__freeaddrinfo_cnames(ai.cnames);
85 ares__freeaddrinfo_nodes(ai.nodes);
86 ares_free(ai.name);
87 ares_free(question_hostname);
88
89 return status;
90 }
91