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/*
* g_krbhst.c
*
* Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
* of Technology.
*
* For copying and distribution information, please see the file
* <mit-copyright.h>.
*/
#include "mit-copyright.h"
#include <stdio.h>
#include "krb.h"
#include <string.h>
#include "krb4int.h"
#include "port-sockets.h"
/*
* Given a Kerberos realm, find a host on which the Kerberos authenti-
* cation server can be found.
*
* krb_get_krbhst takes a pointer to be filled in, a pointer to the name
* of the realm for which a server is desired, and an integer, n, and
* returns (in h) the nth entry from the configuration file (KRB_CONF,
* defined in "krb.h") associated with the specified realm.
*
* On end-of-file, krb_get_krbhst returns KFAILURE. If n=1 and the
* configuration file does not exist, krb_get_krbhst will return KRB_HOST
* (also defined in "krb.h"). If all goes well, the routine returnes
* KSUCCESS.
*
* The KRB_CONF file contains the name of the local realm in the first
* line (not used by this routine), followed by lines indicating realm/host
* entries. The words "admin server" following the hostname indicate that
* the host provides an administrative database server.
* This will also look in KRB_FB_CONF if ATHENA_CONF_FALLBACK is defined.
*
* For example:
*
* ATHENA.MIT.EDU
* ATHENA.MIT.EDU kerberos-1.mit.edu admin server
* ATHENA.MIT.EDU kerberos-2.mit.edu
* LCS.MIT.EDU kerberos.lcs.mit.edu admin server
*
* This is a temporary hack to allow us to find the nearest system running
* kerberos. In the long run, this functionality will be provided by a
* nameserver.
*/
static int
get_krbhst_default(h, r, n)
char *h;
char *r;
int n;
{
if (n==1) {
(void) strncpy(h,KRB_HOST,MAXHOSTNAMELEN-1);
h[MAXHOSTNAMELEN-1] = '\0';
(void) strncat(h,".",MAXHOSTNAMELEN-1-strlen(h));
(void) strncat(h,r,MAXHOSTNAMELEN-1-strlen(h));
/* KRB_HOST.REALM (ie. kerberos.CYGNUS.COM) */
return(KSUCCESS);
}
else
return(KFAILURE);
}
int KRB5_CALLCONV
krb_get_krbhst(h,r,n)
char *h;
char *r;
int n;
{
FILE *cnffile;
char tr[REALM_SZ];
char linebuf[BUFSIZ];
register int i;
cnffile = krb__get_cnffile();
if (!cnffile)
return get_krbhst_default(h, r, n);
if (fscanf(cnffile,"%39s",tr) == EOF) /* XXX assumes REALM_SZ == 40 */
return get_krbhst_default(h, r, n);
/* run through the file, looking for the nth server for this realm */
for (i = 1; i <= n;) {
if (fgets(linebuf, BUFSIZ, cnffile) == NULL) {
(void) fclose(cnffile);
return get_krbhst_default(h, r, n);
}
if (sscanf(linebuf, "%39s %1023s", tr, h) != 2) /* REALM_SZ == 40 */
continue;
if (!strcmp(tr,r))
i++;
}
(void) fclose(cnffile);
return(KSUCCESS);
}
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