2 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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34 #include "krb5_locl.h"
36 static krb5_error_code
37 copy_hostname(krb5_context context,
38 const char *orig_hostname,
41 *new_hostname = strdup (orig_hostname);
42 if (*new_hostname == NULL) {
43 krb5_set_error_message(context, ENOMEM,
44 N_("malloc: out of memory", ""));
47 strlwr (*new_hostname);
52 * krb5_expand_hostname() tries to make orig_hostname into a more
53 * canonical one in the newly allocated space returned in
56 * @param context a Keberos context
57 * @param orig_hostname hostname to canonicalise.
58 * @param new_hostname output hostname, caller must free hostname with
61 * @return Return an error code or 0, see krb5_get_error_message().
63 * @ingroup krb5_support
66 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
67 krb5_expand_hostname (krb5_context context,
68 const char *orig_hostname,
71 struct addrinfo *ai, *a, hints;
74 if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
75 return copy_hostname (context, orig_hostname, new_hostname);
77 memset (&hints, 0, sizeof(hints));
78 hints.ai_flags = AI_CANONNAME;
80 error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
82 return copy_hostname (context, orig_hostname, new_hostname);
83 for (a = ai; a != NULL; a = a->ai_next) {
84 if (a->ai_canonname != NULL) {
85 *new_hostname = strdup (a->ai_canonname);
87 if (*new_hostname == NULL) {
88 krb5_set_error_message(context, ENOMEM,
89 N_("malloc: out of memory", ""));
97 return copy_hostname (context, orig_hostname, new_hostname);
101 * handle the case of the hostname being unresolvable and thus identical
104 static krb5_error_code
105 vanilla_hostname (krb5_context context,
106 const char *orig_hostname,
112 ret = copy_hostname (context, orig_hostname, new_hostname);
115 strlwr (*new_hostname);
117 ret = krb5_get_host_realm (context, *new_hostname, realms);
119 free (*new_hostname);
126 * krb5_expand_hostname_realms() expands orig_hostname to a name we
127 * believe to be a hostname in newly allocated space in new_hostname
128 * and return the realms new_hostname is believed to belong to in
131 * @param context a Keberos context
132 * @param orig_hostname hostname to canonicalise.
133 * @param new_hostname output hostname, caller must free hostname with
135 * @param realms output possible realms, is an array that is terminated
136 * with NULL. Caller must free with krb5_free_host_realm().
138 * @return Return an error code or 0, see krb5_get_error_message().
140 * @ingroup krb5_support
143 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
144 krb5_expand_hostname_realms (krb5_context context,
145 const char *orig_hostname,
149 struct addrinfo *ai, *a, hints;
151 krb5_error_code ret = 0;
153 if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
154 return vanilla_hostname (context, orig_hostname, new_hostname,
157 memset (&hints, 0, sizeof(hints));
158 hints.ai_flags = AI_CANONNAME;
160 error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
162 return vanilla_hostname (context, orig_hostname, new_hostname,
165 for (a = ai; a != NULL; a = a->ai_next) {
166 if (a->ai_canonname != NULL) {
167 ret = copy_hostname (context, a->ai_canonname, new_hostname);
172 strlwr (*new_hostname);
173 ret = krb5_get_host_realm (context, *new_hostname, realms);
178 free (*new_hostname);
182 return vanilla_hostname (context, orig_hostname, new_hostname, realms);