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/*
* lib/krb5/os/get_krbhst.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_krbhst() function.
*/
#include "k5-int.h"
#include <stdio.h>
#include <ctype.h>
/*
Figures out the Kerberos server names for the given realm, filling in a
pointer to an argv[] style list of names, terminated with a null pointer.
If the realm is unknown, the filled-in pointer is set to NULL.
The pointer array and strings pointed to are all in allocated storage,
and should be freed by the caller when finished.
returns system errors
*/
/*
* Implementation: the server names for given realms are stored in a
* configuration file,
* named by krb5_config_file; the first token (on the first line) in
* this file is taken as the default local realm name.
*
* Each succeeding line has a realm name as the first token, and a server name
* as a second token. Additional tokens may be present on the line, but
* are ignored by this function.
*
* All lines which begin with the desired realm name will have the
* hostname added to the list returned.
*/
extern char *krb5_config_file; /* extern so can be set at
load/runtime */
krb5_error_code INTERFACE
krb5_get_krbhst(context, realm, hostlist)
krb5_context context;
const krb5_data *realm;
char ***hostlist;
{
FILE *config_file;
char filebuf[BUFSIZ];
krb5_error_code retval;
char *cp, *cp2;
register char **rethlist = 0;
int hlindex = 0;
int hlsize = 2; /* Always have to null terminate
* host list, so be sure there
* is enough room in the common
* case.
*/
krb5_find_config_files();
if (!(config_file = fopen(krb5_config_file, "r")))
/* can't open */
return KRB5_CONFIG_CANTOPEN;
if (fgets(filebuf, sizeof(filebuf), config_file) == NULL)
retval = KRB5_CONFIG_BADFORMAT;
else {
retval = 0;
rethlist = (char **)calloc(hlsize, sizeof (*rethlist));
for (;;) {
if (fgets(filebuf, sizeof(filebuf), config_file) == NULL)
break;
if (strncmp(filebuf, realm->data, realm->length))
continue; /* no match */
/* +1 to get beyond trailing space */
if (strlen(filebuf) < (size_t) realm->length + 1) {
/* no hostname on config line */
retval = KRB5_CONFIG_BADFORMAT;
break;
}
if (!isspace(filebuf[realm->length])) {
continue; /* no match */
}
/* Throw away any whitespace between tokens */
for (cp = &filebuf[realm->length + 1]; isspace(*cp); cp++);
if (! *cp) {
/* no hostname on config line */
retval = KRB5_CONFIG_BADFORMAT;
break;
}
/* Throw away any trailing whitespace or tokens */
for (cp2 = cp+1; *cp2 && !isspace(*cp2); cp2++);
*cp2 = '\0';
rethlist[hlindex] = strdup(cp);
if (!rethlist[hlindex]) {
for (--hlindex; hlindex >= 0; hlindex--)
free(rethlist[hlindex]);
krb5_xfree(rethlist);
rethlist = 0;
retval = ENOMEM;
break;
}
if (++hlindex >= hlsize) {
/* need larger pointer array */
hlsize *= 2;
rethlist = (char **)realloc((char *)rethlist,
hlsize * sizeof(*rethlist));
if (!rethlist) {
/* XXX clean up the old saved strings?
realloc might possibly trash them if it fails? */
retval = ENOMEM;
break;
}
}
rethlist[hlindex] = 0;
}
}
(void) fclose(config_file);
if (hlindex == 0) {
krb5_xfree(rethlist);
rethlist = 0;
retval = KRB5_REALM_UNKNOWN;
}
*hostlist = rethlist;
return retval;
}
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