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/*
* lib/krb5/os/realm_dom.c
*
* Copyright 1990,1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* krb5_get_realm_domain()
*/
/*
* Determines the proper domain name for a realm. This is mainly so that
* a krb4 principal can be converted properly into a krb5 principal.
* Currently, the same style of mapping file used in krb4.
*
* If realm is NULL, this function will assume the default realm
* of the local host.
*
* The returned domain is allocated, and must be freed by the caller.
*
* This was hacked together from krb5_get_host_realm().
*/
#include "k5-int.h"
#include <ctype.h>
#include <stdio.h>
/* for old Unixes and friends ... */
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif
#define DEF_REALMNAME_SIZE 256
extern char *krb5_trans_file;
#ifdef _WINDOWS
/*
* Windows DLL can't use the fscanf routine. We need fscanf to read
* in the host and realm. Read_2str with read_1str duplicate the needed
* functionality. See also host_realm.c
*/
static int
read_1str (FILE *fp, char *buf, int buflen) {
int c;
while (1) {
c = fgetc (fp); /* Past leading whitespace */
if (c == EOF)
return 0;
if (! isspace (c))
break;
}
while (1) {
if (buflen > 0) { /* Store the character */
*buf++ = (char) c;
--buflen;
}
if (buflen <= 0) /* Fscanf stops scanning... */
break; /* ...when buffer is full */
c = fgetc (fp); /* Get next character */
if (c == EOF || isspace (c))
break;
}
if (buflen) /* Make ASCIIZ if room */
*buf = '\0';
return 1;
}
static int
read_2str (FILE *fp, char *b1, int l1, char *b2, int l2) {
int n;
n = read_1str (fp, b1, l1); /* Read first string */
if (!n) return EOF;
n = read_1str (fp, b2, l2); /* Read second string */
if (!n) return 1;
return 2;
}
#endif /* _WINDOWS */
krb5_error_code
krb5_get_realm_domain(context, realm, domain)
krb5_context context;
const char *realm;
char **domain;
{
char **realmlist = NULL;
char *retdomain = NULL;
char trans_host[MAXHOSTNAMELEN+1];
char trans_realm[DEF_REALMNAME_SIZE];
krb5_error_code retval;
FILE *trans_file;
int scanval;
char scanstring[7+2*16]; /* 7 chars + 16 for each decimal
conversion */
if (realm == NULL) {
if (retval = krb5_get_host_realm(context, NULL, &realmlist))
return retval;
realm = realmlist[0];
}
krb5_find_config_files();
if ((trans_file = fopen(krb5_trans_file, "r")) == (FILE *) 0) {
if (realmlist != NULL) {
krb5_xfree(realmlist[0]);
krb5_xfree(realmlist);
}
return KRB5_TRANS_CANTOPEN;
}
(void) sprintf(scanstring, "%%%ds %%%ds",
sizeof(trans_host)-1,sizeof(trans_realm)-1);
while (1) {
#ifdef _WINDOWS
scanval = read_2str (trans_file, trans_host, sizeof(trans_host)-1,
trans_realm, sizeof(trans_realm)-1);
#else
scanval = fscanf(trans_file, scanstring, trans_host, trans_realm);
#endif
if (scanval != 2) {
if (scanval == EOF) {
fclose(trans_file);
if (realmlist != NULL) {
krb5_xfree(realmlist[0]);
krb5_xfree(realmlist);
}
if ((retdomain = malloc(strlen(realm) + 2)) == NULL)
return ENOMEM;
strcpy(retdomain, ".");
strcat(retdomain, realm); /* return the realm as the domain
if lookup fails */
*domain = retdomain;
return 0;
}
continue;
}
trans_host[sizeof(trans_host)-1] = '\0';
trans_realm[sizeof(trans_realm)-1] = '\0';
if (!strcmp(trans_realm, realm)) {
if (trans_host[0] == '.') {
if ((retdomain = malloc(strlen(trans_host) + 1)) == NULL) {
if (realmlist != NULL) {
krb5_xfree(realmlist[0]);
krb5_xfree(realmlist);
}
return ENOMEM;
}
(void)strcpy(retdomain, trans_host);
fclose(trans_file);
if (realmlist != NULL) {
krb5_xfree(realmlist[0]);
krb5_xfree(realmlist);
}
*domain = retdomain;
return 0;
} else
continue;
}
}
}
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