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/*
* Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb_locl.h"
RCSID("$Id: get_krbrlm.c,v 1.25 1999/12/02 16:58:41 joda Exp $");
/*
* krb_get_lrealm takes a pointer to a string, and a number, n. It fills
* in the string, r, with the name of the nth realm specified on the
* first line of the kerberos config file (KRB_CONF, defined in "krb.h").
* It returns 0 (KSUCCESS) on success, and KFAILURE on failure. If the
* config file does not exist, and if n=1, a successful return will occur
* with r = KRB_REALM (also defined in "krb.h").
*
* For the format of the KRB_CONF file, see comments describing the routine
* krb_get_krbhst().
*/
static int
krb_get_lrealm_f(char *r, int n, const char *fname)
{
char buf[1024];
char *p;
int nchar;
FILE *f;
int ret = KFAILURE;
if (n < 0)
return KFAILURE;
if(n == 0)
n = 1;
f = fopen(fname, "r");
if (f == 0)
return KFAILURE;
for (; n > 0; n--)
if (fgets(buf, sizeof(buf), f) == 0)
goto done;
/* We now have the n:th line, remove initial white space. */
p = buf + strspn(buf, " \t");
/* Collect realmname. */
nchar = strcspn(p, " \t\n");
if (nchar == 0 || nchar > REALM_SZ)
goto done; /* No realmname */
strncpy(r, p, nchar);
r[nchar] = 0;
/* Does more junk follow? */
p += nchar;
nchar = strspn(p, " \t\n");
if (p[nchar] == 0)
ret = KSUCCESS; /* This was a realm name only line. */
done:
fclose(f);
return ret;
}
static const char *no_default_realm = "NO.DEFAULT.REALM";
int
krb_get_lrealm(char *r, int n)
{
int i;
char file[MaxPathLen];
for (i = 0; krb_get_krbconf(i, file, sizeof(file)) == 0; i++)
if (krb_get_lrealm_f(r, n, file) == KSUCCESS)
return KSUCCESS;
/* When nothing else works try default realm */
if (n == 1) {
char *t = krb_get_default_realm();
if (strcmp(t, no_default_realm) == 0)
return KFAILURE; /* Can't figure out default realm */
strcpy(r, t);
return KSUCCESS;
}
else
return(KFAILURE);
}
/* Returns local realm if that can be figured out else NO.DEFAULT.REALM */
char *
krb_get_default_realm(void)
{
static char local_realm[REALM_SZ]; /* Local kerberos realm */
if (local_realm[0] == 0) {
char *t, hostname[MaxHostNameLen];
strlcpy(local_realm, no_default_realm,
sizeof(local_realm)); /* Provide default */
gethostname(hostname, sizeof(hostname));
t = krb_realmofhost(hostname);
if (t && strcmp(t, no_default_realm) != 0)
strlcpy(local_realm, t, sizeof(local_realm));
}
return local_realm;
}
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