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34 #include "krb5_locl.h"
36 RCSID("$Id: expand_hostname.c,v 1.11 2001/09/18 09:35:47 joda Exp $");
38 static krb5_error_code
39 copy_hostname(krb5_context context,
40 const char *orig_hostname,
43 *new_hostname = strdup (orig_hostname);
44 if (*new_hostname == NULL) {
45 krb5_set_error_string(context, "malloc: out of memory");
48 strlwr (*new_hostname);
53 * Try to make `orig_hostname' into a more canonical one in the newly
54 * allocated space returned in `new_hostname'.
58 krb5_expand_hostname (krb5_context context,
59 const char *orig_hostname,
62 struct addrinfo *ai, *a, hints;
65 memset (&hints, 0, sizeof(hints));
66 hints.ai_flags = AI_CANONNAME;
68 error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
70 return copy_hostname (context, orig_hostname, new_hostname);
71 for (a = ai; a != NULL; a = a->ai_next) {
72 if (a->ai_canonname != NULL) {
73 *new_hostname = strdup (a->ai_canonname);
75 if (*new_hostname == NULL) {
76 krb5_set_error_string(context, "malloc: out of memory");
84 return copy_hostname (context, orig_hostname, new_hostname);
88 * handle the case of the hostname being unresolvable and thus identical
91 static krb5_error_code
92 vanilla_hostname (krb5_context context,
93 const char *orig_hostname,
99 ret = copy_hostname (context, orig_hostname, new_hostname);
102 strlwr (*new_hostname);
104 ret = krb5_get_host_realm (context, *new_hostname, realms);
106 free (*new_hostname);
113 * expand `hostname' to a name we believe to be a hostname in newly
114 * allocated space in `host' and return realms in `realms'.
118 krb5_expand_hostname_realms (krb5_context context,
119 const char *orig_hostname,
123 struct addrinfo *ai, *a, hints;
125 krb5_error_code ret = 0;
127 memset (&hints, 0, sizeof(hints));
128 hints.ai_flags = AI_CANONNAME;
130 error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
132 return vanilla_hostname (context, orig_hostname, new_hostname,
135 for (a = ai; a != NULL; a = a->ai_next) {
136 if (a->ai_canonname != NULL) {
137 ret = copy_hostname (context, a->ai_canonname, new_hostname);
142 strlwr (*new_hostname);
143 ret = krb5_get_host_realm (context, *new_hostname, realms);
148 free (*new_hostname);
152 return vanilla_hostname (context, orig_hostname, new_hostname, realms);