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