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DEFINITIONS
This source file includes following definitions.
- copy_hostname
- krb5_expand_hostname
- vanilla_hostname
- krb5_expand_hostname_realms
1 /*
2 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include "krb5_locl.h"
35
36 RCSID("$Id$");
37
38 static krb5_error_code
39 copy_hostname(krb5_context context,
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40 const char *orig_hostname,
41 char **new_hostname)
42 {
43 *new_hostname = strdup (orig_hostname);
44 if (*new_hostname == NULL) {
45 krb5_set_error_message(context, ENOMEM,
46 N_("malloc: out of memory", ""));
47 return ENOMEM;
48 }
49 strlwr (*new_hostname);
50 return 0;
51 }
52
53 /*
54 * Try to make `orig_hostname' into a more canonical one in the newly
55 * allocated space returned in `new_hostname'.
56 */
57
58 krb5_error_code KRB5_LIB_FUNCTION
59 krb5_expand_hostname (krb5_context context,
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60 const char *orig_hostname,
61 char **new_hostname)
62 {
63 struct addrinfo *ai, *a, hints;
64 int error;
65
66 if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
67 return copy_hostname (context, orig_hostname, new_hostname);
68
69 memset (&hints, 0, sizeof(hints));
70 hints.ai_flags = AI_CANONNAME;
71
72 error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
73 if (error)
74 return copy_hostname (context, orig_hostname, new_hostname);
75 for (a = ai; a != NULL; a = a->ai_next) {
76 if (a->ai_canonname != NULL) {
77 *new_hostname = strdup (a->ai_canonname);
78 freeaddrinfo (ai);
79 if (*new_hostname == NULL) {
80 krb5_set_error_message(context, ENOMEM,
81 N_("malloc: out of memory", ""));
82 return ENOMEM;
83 } else {
84 return 0;
85 }
86 }
87 }
88 freeaddrinfo (ai);
89 return copy_hostname (context, orig_hostname, new_hostname);
90 }
91
92 /*
93 * handle the case of the hostname being unresolvable and thus identical
94 */
95
96 static krb5_error_code
97 vanilla_hostname (krb5_context context,
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98 const char *orig_hostname,
99 char **new_hostname,
100 char ***realms)
101 {
102 krb5_error_code ret;
103
104 ret = copy_hostname (context, orig_hostname, new_hostname);
105 if (ret)
106 return ret;
107 strlwr (*new_hostname);
108
109 ret = krb5_get_host_realm (context, *new_hostname, realms);
110 if (ret) {
111 free (*new_hostname);
112 return ret;
113 }
114 return 0;
115 }
116
117 /*
118 * expand `hostname' to a name we believe to be a hostname in newly
119 * allocated space in `host' and return realms in `realms'.
120 */
121
122 krb5_error_code KRB5_LIB_FUNCTION
123 krb5_expand_hostname_realms (krb5_context context,
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124 const char *orig_hostname,
125 char **new_hostname,
126 char ***realms)
127 {
128 struct addrinfo *ai, *a, hints;
129 int error;
130 krb5_error_code ret = 0;
131
132 if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
133 return vanilla_hostname (context, orig_hostname, new_hostname,
134 realms);
135
136 memset (&hints, 0, sizeof(hints));
137 hints.ai_flags = AI_CANONNAME;
138
139 error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
140 if (error)
141 return vanilla_hostname (context, orig_hostname, new_hostname,
142 realms);
143
144 for (a = ai; a != NULL; a = a->ai_next) {
145 if (a->ai_canonname != NULL) {
146 ret = copy_hostname (context, a->ai_canonname, new_hostname);
147 if (ret) {
148 freeaddrinfo (ai);
149 return ret;
150 }
151 strlwr (*new_hostname);
152 ret = krb5_get_host_realm (context, *new_hostname, realms);
153 if (ret == 0) {
154 freeaddrinfo (ai);
155 return 0;
156 }
157 free (*new_hostname);
158 }
159 }
160 freeaddrinfo(ai);
161 return vanilla_hostname (context, orig_hostname, new_hostname, realms);
162 }