1 /*
2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4 /*
5 * lib/krb5/os/hostaddr.c
6 *
7 * Copyright 1990,1991 by the Massachusetts Institute of Technology.
8 * All Rights Reserved.
9 *
10 * Export of this software from the United States of America may
11 * require a specific license from the United States Government.
12 * It is the responsibility of any person or organization contemplating
13 * export to obtain such a license before exporting.
14 *
15 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
16 * distribute this software and its documentation for any purpose and
17 * without fee is hereby granted, provided that the above copyright
18 * notice appear in all copies and that both that copyright notice and
19 * this permission notice appear in supporting documentation, and that
20 * the name of M.I.T. not be used in advertising or publicity pertaining
21 * to distribution of the software without specific, written prior
22 * permission. Furthermore if you modify this software you must label
23 * your software as modified software and not distribute it in such a
24 * fashion that it might be confused with the original M.I.T. software.
25 * M.I.T. makes no representations about the suitability of
26 * this software for any purpose. It is provided "as is" without express
27 * or implied warranty.
28 *
29 * This routine returns a list of krb5 addresses given a hostname.
30 *
31 */
32
33 #include "k5-int.h"
34 #include <locale.h>
35 #include "fake-addrinfo.h"
36
37 krb5_error_code
krb5_os_hostaddr(krb5_context context,const char * name,krb5_address *** ret_addrs)38 krb5_os_hostaddr(krb5_context context, const char *name, krb5_address ***ret_addrs)
39 {
40 krb5_error_code retval;
41 krb5_address **addrs;
42 int i, j, r;
43 struct addrinfo hints, *ai, *aip;
44
45 if (!name) {
46 return KRB5_ERR_BAD_HOSTNAME;
47 }
48
49 memset (&hints, 0, sizeof (hints));
50 hints.ai_flags = AI_NUMERICHOST;
51 /* We don't care what kind at this point, really, but without
52 this, we can get back multiple sockaddrs per address, for
53 SOCK_DGRAM, SOCK_STREAM, and SOCK_RAW. I haven't checked if
54 that's what the spec indicates. */
55 hints.ai_socktype = SOCK_DGRAM;
56
57 r = getaddrinfo (name, 0, &hints, &ai);
58 if (r && AI_NUMERICHOST != 0) {
59 hints.ai_flags &= ~AI_NUMERICHOST;
60 r = getaddrinfo (name, 0, &hints, &ai);
61 }
62 if (r) {
63 krb5_set_error_message(context, KRB5_ERR_BAD_HOSTNAME,
64 dgettext(TEXT_DOMAIN,
65 "Hostname cannot be canonicalized for '%s': %s"),
66 name, strerror(r));
67 return KRB5_ERR_BAD_HOSTNAME;
68 }
69
70 for (i = 0, aip = ai; aip; aip = aip->ai_next) {
71 switch (aip->ai_addr->sa_family) {
72 case AF_INET:
73 #ifdef KRB5_USE_INET6
74 case AF_INET6:
75 #endif
76 i++;
77 default:
78 /* Ignore addresses of unknown families. */
79 ;
80 }
81 }
82
83 addrs = malloc ((i+1) * sizeof(*addrs));
84 if (!addrs)
85 return errno;
86
87 for (j = 0; j < i + 1; j++)
88 addrs[j] = 0;
89
90 for (i = 0, aip = ai; aip; aip = aip->ai_next) {
91 void *ptr;
92 size_t addrlen;
93 int atype;
94
95 switch (aip->ai_addr->sa_family) {
96 case AF_INET:
97 addrlen = sizeof (struct in_addr);
98 /*LINTED*/
99 ptr = &sa2sin(aip->ai_addr)->sin_addr;
100 atype = ADDRTYPE_INET;
101 break;
102 #ifdef KRB5_USE_INET6
103 case AF_INET6:
104 addrlen = sizeof (struct in6_addr);
105 /*LINTED*/
106 ptr = &sa2sin6(aip->ai_addr)->sin6_addr;
107 atype = ADDRTYPE_INET6;
108 break;
109 #endif
110 default:
111 continue;
112 }
113 addrs[i] = (krb5_address *) malloc(sizeof(krb5_address));
114 if (!addrs[i]) {
115 retval = ENOMEM;
116 goto errout;
117 }
118 addrs[i]->magic = KV5M_ADDRESS;
119 addrs[i]->addrtype = atype;
120 addrs[i]->length = addrlen;
121 addrs[i]->contents = malloc(addrs[i]->length);
122 if (!addrs[i]->contents) {
123 retval = ENOMEM;
124 goto errout;
125 }
126 memcpy (addrs[i]->contents, ptr, addrs[i]->length);
127 i++;
128 }
129
130 *ret_addrs = addrs;
131 if (ai)
132 freeaddrinfo(ai);
133 return 0;
134
135 errout:
136 /* Solaris Kerberos */
137 if (addrs)
138 krb5_free_addresses(context, addrs);
139 if (ai)
140 freeaddrinfo(ai);
141 return retval;
142
143 }
144
145