225 lines
5.6 KiB
C
225 lines
5.6 KiB
C
/* Copyright (C) 1997-1999, 2004, 2005, 2006 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <string.h>
|
|
#include <rpcsvc/nis.h>
|
|
#include "nis_xdr.h"
|
|
#include "nis_intern.h"
|
|
#include <libnsl.h>
|
|
|
|
|
|
nis_result *
|
|
nis_lookup (const_nis_name name, const unsigned int flags)
|
|
{
|
|
nis_result *res = calloc (1, sizeof (nis_result));
|
|
struct ns_request req;
|
|
nis_name *names;
|
|
nis_error status;
|
|
int link_first_try = 0;
|
|
int count_links = 0; /* We will follow only 16 links in the deep */
|
|
int done = 0;
|
|
int name_nr = 0;
|
|
nis_name namebuf[2] = {NULL, NULL};
|
|
|
|
if (res == NULL)
|
|
return NULL;
|
|
|
|
if ((flags & EXPAND_NAME) && (name[strlen (name) - 1] != '.'))
|
|
{
|
|
names = nis_getnames (name);
|
|
if (names == NULL)
|
|
{
|
|
NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE;
|
|
return res;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
names = namebuf;
|
|
names[0] = (nis_name)name;
|
|
}
|
|
|
|
req.ns_name = names[0];
|
|
while (!done)
|
|
{
|
|
dir_binding bptr;
|
|
directory_obj *dir = NULL;
|
|
req.ns_object.ns_object_len = 0;
|
|
req.ns_object.ns_object_val = NULL;
|
|
|
|
status = __prepare_niscall (req.ns_name, &dir, &bptr, flags);
|
|
if (__builtin_expect (status != NIS_SUCCESS, 0))
|
|
{
|
|
NIS_RES_STATUS (res) = status;
|
|
goto out;
|
|
}
|
|
|
|
do
|
|
{
|
|
static const struct timeval RPCTIMEOUT = {10, 0};
|
|
enum clnt_stat result;
|
|
char ndomain[strlen (req.ns_name) + 1];
|
|
|
|
again:
|
|
result = clnt_call (bptr.clnt, NIS_LOOKUP,
|
|
(xdrproc_t) _xdr_ns_request,
|
|
(caddr_t) &req, (xdrproc_t) _xdr_nis_result,
|
|
(caddr_t) res, RPCTIMEOUT);
|
|
|
|
if (result != RPC_SUCCESS)
|
|
status = NIS_RPCERROR;
|
|
else
|
|
{
|
|
status = NIS_SUCCESS;
|
|
|
|
if (NIS_RES_STATUS (res) == NIS_SUCCESS)
|
|
{
|
|
if (__type_of (NIS_RES_OBJECT (res)) == NIS_LINK_OBJ
|
|
&& (flags & FOLLOW_LINKS)) /* We are following links */
|
|
{
|
|
/* if we hit the link limit, bail */
|
|
if (count_links > NIS_MAXLINKS)
|
|
{
|
|
NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
|
|
break;
|
|
}
|
|
++count_links;
|
|
req.ns_name =
|
|
strdupa (NIS_RES_OBJECT (res)->LI_data.li_name);
|
|
|
|
/* The following is a non-obvious optimization. A
|
|
nis_freeresult call would call xdr_free as the
|
|
following code. But it also would unnecessarily
|
|
free the result structure. We avoid this here
|
|
along with the necessary tests. */
|
|
xdr_free ((xdrproc_t) _xdr_nis_result, (char *) res);
|
|
memset (res, '\0', sizeof (*res));
|
|
|
|
link_first_try = 1; /* Try at first the old binding */
|
|
goto again;
|
|
}
|
|
}
|
|
else
|
|
if (NIS_RES_STATUS (res) == NIS_SYSTEMERROR
|
|
|| NIS_RES_STATUS (res) == NIS_NOSUCHNAME
|
|
|| NIS_RES_STATUS (res) == NIS_NOT_ME)
|
|
{
|
|
if (link_first_try)
|
|
{
|
|
__nisbind_destroy (&bptr);
|
|
nis_free_directory (dir);
|
|
/* Otherwise __nisfind_server will not do anything. */
|
|
dir = NULL;
|
|
|
|
if (__nisfind_server (req.ns_name, &dir)
|
|
!= NIS_SUCCESS)
|
|
goto out;
|
|
|
|
if (__nisbind_create (&bptr,
|
|
dir->do_servers.do_servers_val,
|
|
dir->do_servers.do_servers_len,
|
|
flags) != NIS_SUCCESS)
|
|
{
|
|
nis_free_directory (dir);
|
|
goto out;
|
|
}
|
|
}
|
|
else
|
|
if (__nisbind_next (&bptr) != NIS_SUCCESS)
|
|
{
|
|
/* No more servers to search. Try parent. */
|
|
nis_domain_of_r (req.ns_name, ndomain,
|
|
sizeof (ndomain));
|
|
req.ns_name = strdupa (ndomain);
|
|
|
|
__nisbind_destroy (&bptr);
|
|
nis_free_directory (dir);
|
|
dir = NULL;
|
|
status = __prepare_niscall (req.ns_name, &dir,
|
|
&bptr, flags);
|
|
if (__builtin_expect (status != NIS_SUCCESS, 0))
|
|
{
|
|
NIS_RES_STATUS (res) = status;
|
|
goto out;
|
|
}
|
|
goto again;
|
|
}
|
|
|
|
while (__nisbind_connect (&bptr) != NIS_SUCCESS)
|
|
{
|
|
if (__nisbind_next (&bptr) != NIS_SUCCESS)
|
|
{
|
|
nis_free_directory (dir);
|
|
goto out;
|
|
}
|
|
}
|
|
goto again;
|
|
}
|
|
break;
|
|
}
|
|
link_first_try = 0; /* Set it back */
|
|
}
|
|
while ((flags & HARD_LOOKUP) && status == NIS_RPCERROR);
|
|
|
|
__nisbind_destroy (&bptr);
|
|
nis_free_directory (dir);
|
|
|
|
if (status != NIS_SUCCESS)
|
|
{
|
|
NIS_RES_STATUS (res) = status;
|
|
goto out;
|
|
}
|
|
|
|
switch (NIS_RES_STATUS (res))
|
|
{
|
|
case NIS_PARTIAL:
|
|
case NIS_SUCCESS:
|
|
case NIS_S_SUCCESS:
|
|
case NIS_LINKNAMEERROR: /* We follow to max links */
|
|
case NIS_UNAVAIL: /* NIS+ is not installed, or all servers are down */
|
|
++done;
|
|
break;
|
|
default:
|
|
/* Try the next domainname if we don't follow a link */
|
|
if (count_links)
|
|
{
|
|
free (req.ns_name);
|
|
NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
|
|
++done;
|
|
break;
|
|
}
|
|
++name_nr;
|
|
if (names[name_nr] == NULL)
|
|
{
|
|
++done;
|
|
break;
|
|
}
|
|
req.ns_name = names[name_nr];
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (names != namebuf)
|
|
nis_freenames (names);
|
|
|
|
return res;
|
|
}
|
|
libnsl_hidden_def (nis_lookup)
|