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85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
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/*
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* Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
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* of Technology.
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* For copying and distribution information, please see the file
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* <Copyright.MIT>.
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*
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* from: get_krbhst.c,v 4.8 89/01/22 20:00:29 rfrench Exp $
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* $Id: get_krbhst.c,v 1.2 1994/07/19 19:25:17 g89r4222 Exp $
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*/
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#ifndef lint
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static char *rcsid =
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"$Id: get_krbhst.c,v 1.2 1994/07/19 19:25:17 g89r4222 Exp $";
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#endif /* lint */
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#include <stdio.h>
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#include <krb.h>
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#include <strings.h>
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/*
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* Given a Kerberos realm, find a host on which the Kerberos authenti-
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* cation server can be found.
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*
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* krb_get_krbhst takes a pointer to be filled in, a pointer to the name
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* of the realm for which a server is desired, and an integer, n, and
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* returns (in h) the nth entry from the configuration file (KRB_CONF,
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* defined in "krb.h") associated with the specified realm.
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*
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* On end-of-file, krb_get_krbhst returns KFAILURE. If n=1 and the
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* configuration file does not exist, krb_get_krbhst will return KRB_HOST
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* (also defined in "krb.h"). If all goes well, the routine returnes
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* KSUCCESS.
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*
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* The KRB_CONF file contains the name of the local realm in the first
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* line (not used by this routine), followed by lines indicating realm/host
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* entries. The words "admin server" following the hostname indicate that
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* the host provides an administrative database server.
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*
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* For example:
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*
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* ATHENA.MIT.EDU
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* ATHENA.MIT.EDU kerberos-1.mit.edu admin server
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* ATHENA.MIT.EDU kerberos-2.mit.edu
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* LCS.MIT.EDU kerberos.lcs.mit.edu admin server
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*
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* This is a temporary hack to allow us to find the nearest system running
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* kerberos. In the long run, this functionality will be provided by a
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* nameserver.
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*/
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krb_get_krbhst(h,r,n)
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char *h;
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char *r;
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int n;
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{
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FILE *cnffile;
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char tr[REALM_SZ];
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char linebuf[BUFSIZ];
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register int i;
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if ((cnffile = fopen(KRB_CONF,"r")) == NULL) {
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if (n==1) {
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(void) strcpy(h,KRB_HOST);
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return(KSUCCESS);
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}
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else
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return(KFAILURE);
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}
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if (fscanf(cnffile,"%s",tr) == EOF)
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return(KFAILURE);
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/* run through the file, looking for the nth server for this realm */
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for (i = 1; i <= n;) {
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if (fgets(linebuf, BUFSIZ, cnffile) == NULL) {
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(void) fclose(cnffile);
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return(KFAILURE);
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}
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if (sscanf(linebuf, "%s %s", tr, h) != 2)
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continue;
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if (!strcmp(tr,r))
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i++;
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}
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(void) fclose(cnffile);
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return(KSUCCESS);
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}
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