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
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