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107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/*
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* Copyright 1988 by the Massachusetts Institute 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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* routine to convert hostname into realm name.
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*
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* from: getrealm.c,v 4.6 90/01/02 13:35:56 jtkohl Exp $
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* $Id$
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*/
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#if 0
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#ifndef lint
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static char rcsid[] =
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"$Id$";
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#endif lint
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#endif
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#include <strings.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <krb.h>
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#include <sys/param.h>
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/* for Ultrix and friends ... */
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#ifndef MAXHOSTNAMELEN
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#define MAXHOSTNAMELEN 64
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#endif
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/*
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* krb_realmofhost.
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* Given a fully-qualified domain-style primary host name,
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* return the name of the Kerberos realm for the host.
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* If the hostname contains no discernable domain, or an error occurs,
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* return the local realm name, as supplied by get_krbrlm().
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* If the hostname contains a domain, but no translation is found,
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* the hostname's domain is converted to upper-case and returned.
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*
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* The format of each line of the translation file is:
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* domain_name kerberos_realm
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* -or-
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* host_name kerberos_realm
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*
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* domain_name should be of the form .XXX.YYY (e.g. .LCS.MIT.EDU)
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* host names should be in the usual form (e.g. FOO.BAR.BAZ)
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*/
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static char ret_realm[REALM_SZ+1];
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char *
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krb_realmofhost(host)
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char *host;
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{
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char *domain;
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FILE *trans_file;
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char trans_host[MAXHOSTNAMELEN+1];
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char trans_realm[REALM_SZ+1];
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int retval;
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domain = index(host, '.');
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/* prepare default */
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if (domain) {
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char *cp;
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strncpy(ret_realm, &domain[1], REALM_SZ);
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ret_realm[REALM_SZ] = '\0';
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/* Upper-case realm */
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for (cp = ret_realm; *cp; cp++)
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if (islower(*cp))
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*cp = toupper(*cp);
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} else {
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krb_get_lrealm(ret_realm, 1);
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}
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if ((trans_file = fopen(KRB_RLM_TRANS, "r")) == (FILE *) 0) {
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/* krb_errno = KRB_NO_TRANS */
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return(ret_realm);
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}
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while (1) {
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if ((retval = fscanf(trans_file, "%s %s",
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trans_host, trans_realm)) != 2) {
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if (retval == EOF) {
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fclose(trans_file);
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return(ret_realm);
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}
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continue; /* ignore broken lines */
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}
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trans_host[MAXHOSTNAMELEN] = '\0';
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trans_realm[REALM_SZ] = '\0';
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if (!strcasecmp(trans_host, host)) {
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/* exact match of hostname, so return the realm */
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(void) strcpy(ret_realm, trans_realm);
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fclose(trans_file);
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return(ret_realm);
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}
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if ((trans_host[0] == '.') && domain) {
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/* this is a domain match */
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if (!strcasecmp(trans_host, domain)) {
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/* domain match, save for later */
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(void) strcpy(ret_realm, trans_realm);
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continue;
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}
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}
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}
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}
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