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/*
* lib/krb5/os/sn2princ.c
*
* Copyright 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.
*
*
* Convert a hostname and service name to a principal in the "standard"
* form.
*/
#include <krb5/krb5.h>
#include <krb5/ext-proto.h>
#include <krb5/los-proto.h>
#include <netdb.h>
#include <ctype.h>
#include <sys/param.h>
krb5_error_code
krb5_sname_to_principal(context, hostname, sname, type, ret_princ)
krb5_context context;
const char * hostname;
const char * sname;
krb5_int32 type;
krb5_principal * ret_princ;
{
struct hostent *hp;
char **hrealms, *realm, *remote_host;
krb5_error_code retval;
register char *cp;
char localname[MAXHOSTNAMELEN];
int use_local_realm = 0;
if ((type == KRB5_NT_UNKNOWN) ||
(type == KRB5_NT_SRV_HST)) {
if (!hostname) {
use_local_realm = 1;
/* convenience hack: if hostname is NULL, use gethostname() */
if (gethostname(localname, MAXHOSTNAMELEN))
return errno;
hostname = localname;
}
/* if sname is NULL, use "host" */
if (! sname) {
sname = "host";
}
/* copy the hostname into non-volatile storage */
if (type == KRB5_NT_SRV_HST) {
char *addr;
if (!(hp = gethostbyname(hostname)))
return KRB5_ERR_BAD_HOSTNAME;
remote_host = strdup(hp->h_name);
if (!remote_host)
return ENOMEM;
/*
* Do a reverse resolution to get the full name, just in
* case there's some funny business going on. If there
* isn't an in-addr record, give up.
*/
addr = malloc(hp->h_length);
if (!addr)
return ENOMEM;
memcpy(addr, hp->h_addr, hp->h_length);
hp = gethostbyaddr(addr, hp->h_length, hp->h_addrtype);
free(addr);
if (hp) {
free(remote_host);
remote_host = strdup(hp->h_name);
if (!remote_host)
return ENOMEM;
}
} else /* type == KRB5_NT_UNKNOWN */ {
remote_host = strdup(hostname);
}
if (!remote_host)
return ENOMEM;
if (type == KRB5_NT_SRV_HST)
for (cp = remote_host; *cp; cp++)
if (isupper(*cp))
*cp = tolower(*cp);
if (use_local_realm) {
if (retval = krb5_get_default_realm(context, &realm)) {
free(remote_host);
return retval;
}
} else {
if (retval = krb5_get_host_realm(context, remote_host, &hrealms)) {
free(remote_host);
return retval;
}
if (!hrealms[0]) {
free(remote_host);
krb5_xfree(hrealms);
return KRB5_ERR_HOST_REALM_UNKNOWN;
}
realm = hrealms[0];
}
retval = krb5_build_principal(context, ret_princ, strlen(realm),
realm, sname, remote_host,
(char *)0);
krb5_princ_type(context, *ret_princ) = type;
free(remote_host);
if (!use_local_realm)
krb5_free_host_realm(context, hrealms);
return retval;
} else {
return KRB5_SNAME_UNSUPP_NAMETYPE;
}
}
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