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glibc/nis/nis_lookup.c
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/* Copyright (C) 1997-1999, 2004, 2005, 2006, 2007 | |
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; | |
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, 1, &dir, &bptr, | |
flags & ~MASTER_ONLY) | |
!= NIS_SUCCESS) | |
goto out; | |
} | |
else | |
if (__nisbind_next (&bptr) != NIS_SUCCESS) | |
{ | |
/* No more servers to search. Try parent. */ | |
const char *ndomain = __nis_domain_of (req.ns_name); | |
req.ns_name = strdupa (ndomain); | |
if (strcmp (req.ns_name, ".") == 0) | |
{ | |
NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE; | |
goto out; | |
} | |
__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) |