415 lines
9.2 KiB
C
415 lines
9.2 KiB
C
/* Copyright (C) 1997, 1999, 2001, 2002, 2003, 2005, 2006
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <atomic.h>
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#include <nss.h>
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#include <errno.h>
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#include <pwd.h>
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#include <string.h>
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#include <bits/libc-lock.h>
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#include <rpcsvc/nis.h>
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#include "nss-nisplus.h"
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#include "nisplus-parser.h"
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#include <libnsl.h>
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__libc_lock_define_initialized (static, lock)
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/* Previous result of iteration. */
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static nis_result *result;
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/* All results of batch table load. */
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static nis_result *cached_results;
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static size_t cached_results_iter;
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nis_name pwd_tablename_val attribute_hidden;
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size_t pwd_tablename_len attribute_hidden;
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enum nss_status
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_nss_pwd_create_tablename (int *errnop)
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{
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if (pwd_tablename_val == NULL)
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{
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const char *local_dir = nis_local_directory ();
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size_t local_dir_len = strlen (local_dir);
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static const char prefix[] = "passwd.org_dir.";
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char *p = malloc (sizeof (prefix) + local_dir_len);
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if (p == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
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pwd_tablename_len = sizeof (prefix) - 1 + local_dir_len;
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atomic_write_barrier ();
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if (atomic_compare_and_exchange_bool_acq (&pwd_tablename_val, p, NULL))
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{
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/* Another thread already installed the value. */
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free (p);
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pwd_tablename_len = strlen (pwd_tablename_val);
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}
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}
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return NSS_STATUS_SUCCESS;
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}
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static void
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internal_nisplus_endpwent (void)
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{
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if (cached_results != NULL)
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{
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nis_freeresult (cached_results);
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cached_results = NULL;
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cached_results_iter = 0;
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}
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if (result != NULL)
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{
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nis_freeresult (result);
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result = NULL;
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}
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}
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static enum nss_status
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internal_nisplus_setpwent (int *errnop)
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{
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enum nss_status status;
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cached_results = nis_list (pwd_tablename_val, FOLLOW_PATH | FOLLOW_LINKS,
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NULL, NULL);
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if (cached_results == NULL)
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{
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*errnop = errno;
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status = NSS_STATUS_TRYAGAIN;
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}
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else if (__builtin_expect ((status = niserr2nss (cached_results->status))
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!= NSS_STATUS_SUCCESS, 0))
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{
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nis_freeresult (cached_results);
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cached_results = NULL;
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}
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else if (__builtin_expect (__type_of (NIS_RES_OBJECT (cached_results))
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!= NIS_ENTRY_OBJ
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|| strcmp (NIS_RES_OBJECT (cached_results)->EN_data.en_type,
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"passwd_tbl") != 0
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|| NIS_RES_OBJECT (cached_results)->EN_data.en_cols.en_cols_len < 7,
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0))
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{
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nis_freeresult (cached_results);
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cached_results = NULL;
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status = NSS_STATUS_NOTFOUND;
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}
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return status;
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}
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enum nss_status
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_nss_nisplus_setpwent (int stayopen)
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{
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enum nss_status status = NSS_STATUS_SUCCESS;
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__libc_lock_lock (lock);
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internal_nisplus_endpwent ();
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if (pwd_tablename_val == NULL)
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{
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// XXX We need to be able to set errno. Pass in new parameter.
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int err;
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status = _nss_pwd_create_tablename (&err);
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}
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if (status == NSS_STATUS_SUCCESS
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&& (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ))
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{
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// XXX We need to be able to set errno. Pass in new parameter.
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int err;
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status = internal_nisplus_setpwent (&err);
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}
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__libc_lock_unlock (lock);
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return status;
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}
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enum nss_status
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_nss_nisplus_endpwent (void)
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{
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__libc_lock_lock (lock);
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internal_nisplus_endpwent ();
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__libc_lock_unlock (lock);
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return NSS_STATUS_SUCCESS;
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}
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static enum nss_status
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internal_nisplus_getpwent_r (struct passwd *pw, char *buffer, size_t buflen,
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int *errnop)
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{
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int parse_res = -1;
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nis_result *saved_res = NULL;
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/* Get the next entry until we found a correct one. */
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do
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{
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if (cached_results != NULL)
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{
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handle_batch_read:
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/* See whether we reported the last problem. */
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if (cached_results_iter >= NIS_RES_NUMOBJ (cached_results))
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return NSS_STATUS_NOTFOUND;
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parse_res = _nss_nisplus_parse_pwent (cached_results,
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cached_results_iter, pw,
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buffer, buflen, errnop);
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}
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else
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{
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if (result == NULL)
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{
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if (pwd_tablename_val == NULL)
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{
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enum nss_status status = _nss_pwd_create_tablename (errnop);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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/* Determine whether we should instead read all entries at
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once. */
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if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
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{
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enum nss_status status = internal_nisplus_setpwent (errnop);
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if (status == NSS_STATUS_SUCCESS && cached_results != NULL)
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goto handle_batch_read;
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}
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saved_res = NULL;
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result = nis_first_entry (pwd_tablename_val);
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if (result == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
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return niserr2nss (result->status);
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}
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else
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{
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saved_res = result;
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result = nis_next_entry (pwd_tablename_val, &result->cookie);
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if (result == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
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{
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nis_freeresult (saved_res);
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return niserr2nss (result->status);
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}
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}
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parse_res = _nss_nisplus_parse_pwent_chk (result, pw, buffer,
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buflen, errnop);
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}
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if (__builtin_expect (parse_res == -1, 0))
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{
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if (cached_results == NULL)
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{
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nis_freeresult (result);
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result = saved_res;
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}
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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if (cached_results != NULL)
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++cached_results_iter;
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else
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if (saved_res)
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{
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nis_freeresult (saved_res);
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saved_res = NULL;
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}
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}
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while (!parse_res);
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_getpwent_r (struct passwd *result, char *buffer, size_t buflen,
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int *errnop)
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{
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int status;
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__libc_lock_lock (lock);
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status = internal_nisplus_getpwent_r (result, buffer, buflen, errnop);
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__libc_lock_unlock (lock);
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return status;
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}
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enum nss_status
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_nss_nisplus_getpwnam_r (const char *name, struct passwd *pw,
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char *buffer, size_t buflen, int *errnop)
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{
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int parse_res;
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if (pwd_tablename_val == NULL)
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{
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enum nss_status status = _nss_pwd_create_tablename (errnop);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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if (name == NULL)
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{
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*errnop = EINVAL;
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return NSS_STATUS_UNAVAIL;
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}
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nis_result *result;
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char buf[strlen (name) + 9 + pwd_tablename_len];
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int olderr = errno;
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snprintf (buf, sizeof (buf), "[name=%s],%s", name, pwd_tablename_val);
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result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
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if (result == NULL)
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{
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
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{
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enum nss_status status = niserr2nss (result->status);
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__set_errno (olderr);
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nis_freeresult (result);
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return status;
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}
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parse_res = _nss_nisplus_parse_pwent_chk (result, pw, buffer, buflen,
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errnop);
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nis_freeresult (result);
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if (__builtin_expect (parse_res < 1, 0))
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{
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if (parse_res == -1)
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{
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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else
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{
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__set_errno (olderr);
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return NSS_STATUS_NOTFOUND;
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}
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}
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_getpwuid_r (const uid_t uid, struct passwd *pw,
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char *buffer, size_t buflen, int *errnop)
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{
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if (pwd_tablename_val == NULL)
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{
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enum nss_status status = _nss_pwd_create_tablename (errnop);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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int parse_res;
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nis_result *result;
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char buf[8 + 3 * sizeof (unsigned long int) + pwd_tablename_len];
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int olderr = errno;
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snprintf (buf, sizeof (buf), "[uid=%lu],%s",
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(unsigned long int) uid, pwd_tablename_val);
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result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
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if (result == NULL)
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{
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
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{
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enum nss_status status = niserr2nss (result->status);
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__set_errno (olderr);
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nis_freeresult (result);
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return status;
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}
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parse_res = _nss_nisplus_parse_pwent_chk (result, pw, buffer, buflen,
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errnop);
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nis_freeresult (result);
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if (__builtin_expect (parse_res < 1, 0))
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{
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if (parse_res == -1)
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{
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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else
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{
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__set_errno (olderr);
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return NSS_STATUS_NOTFOUND;
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}
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}
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return NSS_STATUS_SUCCESS;
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}
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