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
37krb5_error_code
38krb5_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
135errout:
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