2016-01-05 00:05:18 +08:00
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/* Copyright (C) 1998-2016 Free Software Foundation, Inc.
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1998-01-31 16:39:55 +08:00
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 12:58:11 +08:00
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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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1998-01-31 16:39:55 +08:00
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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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2001-07-06 12:58:11 +08:00
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Lesser General Public License for more details.
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1998-01-31 16:39:55 +08:00
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2001-07-06 12:58:11 +08:00
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You should have received a copy of the GNU Lesser General Public
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2012-02-10 07:18:22 +08:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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1998-01-31 16:39:55 +08:00
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2004-09-30 16:08:40 +08:00
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#include <alloca.h>
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2004-09-08 23:46:42 +08:00
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#include <assert.h>
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1998-01-31 16:39:55 +08:00
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#include <errno.h>
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#include <grp.h>
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1999-01-12 04:13:43 +08:00
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#include <stdint.h>
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1998-01-31 16:39:55 +08:00
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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2004-09-08 23:46:42 +08:00
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#include <sys/mman.h>
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1998-01-31 16:39:55 +08:00
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#include <sys/socket.h>
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1998-07-25 05:32:39 +08:00
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#include <sys/uio.h>
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1998-01-31 16:39:55 +08:00
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#include <sys/un.h>
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2004-06-06 14:06:02 +08:00
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#include <not-cancel.h>
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2012-03-21 07:00:23 +08:00
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#include <_itoa.h>
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2015-04-09 02:58:58 +08:00
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#include <scratch_buffer.h>
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1998-01-31 16:39:55 +08:00
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1998-10-19 08:40:00 +08:00
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#include "nscd-client.h"
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1998-01-31 16:39:55 +08:00
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#include "nscd_proto.h"
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1998-03-06 19:39:36 +08:00
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int __nss_not_use_nscd_group;
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1998-10-18 23:16:22 +08:00
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static int nscd_getgr_r (const char *key, size_t keylen, request_type type,
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struct group *resultbuf, char *buffer,
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2004-02-27 08:55:39 +08:00
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size_t buflen, struct group **result)
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internal_function;
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1998-10-18 23:16:22 +08:00
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1998-01-31 16:39:55 +08:00
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int
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__nscd_getgrnam_r (const char *name, struct group *resultbuf, char *buffer,
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2004-02-27 08:55:39 +08:00
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size_t buflen, struct group **result)
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1998-01-31 16:39:55 +08:00
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{
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1998-10-18 23:16:22 +08:00
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return nscd_getgr_r (name, strlen (name) + 1, GETGRBYNAME, resultbuf,
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2004-02-27 08:55:39 +08:00
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buffer, buflen, result);
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1998-01-31 16:39:55 +08:00
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}
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1998-10-18 23:16:22 +08:00
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1998-01-31 16:39:55 +08:00
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int
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__nscd_getgrgid_r (gid_t gid, struct group *resultbuf, char *buffer,
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2004-02-27 08:55:39 +08:00
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size_t buflen, struct group **result)
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1998-01-31 16:39:55 +08:00
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{
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2004-06-06 14:06:02 +08:00
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char buf[3 * sizeof (gid_t)];
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buf[sizeof (buf) - 1] = '\0';
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char *cp = _itoa_word (gid, buf + sizeof (buf) - 1, 10, 0);
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1998-01-31 16:39:55 +08:00
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2004-06-06 14:06:02 +08:00
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return nscd_getgr_r (cp, buf + sizeof (buf) - cp, GETGRBYGID, resultbuf,
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buffer, buflen, result);
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1998-01-31 16:39:55 +08:00
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}
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1998-10-18 23:16:22 +08:00
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2006-05-16 04:46:12 +08:00
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libc_locked_map_ptr (,__gr_map_handle) attribute_hidden;
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2004-09-08 23:46:42 +08:00
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/* Note that we only free the structure if necessary. The memory
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mapping is not removed since it is not visible to the malloc
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handling. */
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libc_freeres_fn (gr_map_free)
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{
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2004-11-10 15:54:40 +08:00
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if (__gr_map_handle.mapped != NO_MAPPING)
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{
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void *p = __gr_map_handle.mapped;
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__gr_map_handle.mapped = NO_MAPPING;
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free (p);
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}
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2004-09-08 23:46:42 +08:00
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}
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1998-01-31 16:39:55 +08:00
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static int
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1999-02-03 00:27:57 +08:00
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internal_function
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1998-10-18 23:16:22 +08:00
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nscd_getgr_r (const char *key, size_t keylen, request_type type,
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2004-08-27 02:35:05 +08:00
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struct group *resultbuf, char *buffer, size_t buflen,
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2004-02-27 08:55:39 +08:00
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struct group **result)
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1998-01-31 16:39:55 +08:00
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{
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2004-09-08 23:46:42 +08:00
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int gc_cycle;
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2007-01-31 17:14:21 +08:00
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int nretries = 0;
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2004-09-30 16:08:40 +08:00
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const uint32_t *len = NULL;
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2015-04-09 02:58:58 +08:00
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struct scratch_buffer lenbuf;
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scratch_buffer_init (&lenbuf);
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2004-09-08 23:46:42 +08:00
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/* If the mapping is available, try to search there instead of
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communicating with the nscd. */
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struct mapped_database *mapped = __nscd_get_map_ref (GETFDGR, "group",
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2004-11-10 15:54:40 +08:00
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&__gr_map_handle,
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&gc_cycle);
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2004-09-30 16:08:40 +08:00
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retry:;
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const char *gr_name = NULL;
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size_t gr_name_len = 0;
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int retval = -1;
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const char *recend = (const char *) ~UINTMAX_C (0);
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2007-01-31 17:14:21 +08:00
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gr_response_header gr_resp;
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2004-09-30 16:08:40 +08:00
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2004-09-08 23:46:42 +08:00
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if (mapped != NO_MAPPING)
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1998-03-06 19:39:36 +08:00
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{
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2009-05-16 12:17:08 +08:00
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struct datahead *found = __nscd_cache_search (type, key, keylen, mapped,
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sizeof gr_resp);
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2004-09-08 23:46:42 +08:00
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if (found != NULL)
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{
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2007-01-31 17:14:21 +08:00
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len = (const uint32_t *) (&found->data[0].grdata + 1);
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gr_resp = found->data[0].grdata;
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2004-09-08 23:46:42 +08:00
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gr_name = ((const char *) len
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2007-01-31 17:14:21 +08:00
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+ gr_resp.gr_mem_cnt * sizeof (uint32_t));
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gr_name_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
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2004-09-08 23:46:42 +08:00
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recend = (const char *) found->data + found->recsize;
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2007-01-31 17:14:21 +08:00
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/* Now check if we can trust gr_resp fields. If GC is
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in progress, it can contain anything. */
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if (mapped->head->gc_cycle != gc_cycle)
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{
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retval = -2;
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goto out;
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}
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/* The alignment is always sufficient, unless GC is in progress. */
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assert (((uintptr_t) len & (__alignof__ (*len) - 1)) == 0);
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2004-09-08 23:46:42 +08:00
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}
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}
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int sock = -1;
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2007-01-31 17:14:21 +08:00
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if (gr_name == NULL)
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2004-09-08 23:46:42 +08:00
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{
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2007-01-31 17:14:21 +08:00
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sock = __nscd_open_socket (key, keylen, type, &gr_resp,
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sizeof (gr_resp));
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2004-09-08 23:46:42 +08:00
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if (sock == -1)
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{
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__nss_not_use_nscd_group = 1;
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goto out;
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}
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1998-03-06 19:39:36 +08:00
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}
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1998-01-31 16:39:55 +08:00
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2004-03-02 06:35:28 +08:00
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/* No value found so far. */
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*result = NULL;
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2014-02-10 21:45:42 +08:00
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if (__glibc_unlikely (gr_resp.found == -1))
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1998-01-31 16:39:55 +08:00
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{
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1998-03-06 19:39:36 +08:00
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/* The daemon does not cache this database. */
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__nss_not_use_nscd_group = 1;
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2004-09-08 23:46:42 +08:00
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goto out_close;
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1998-01-31 16:39:55 +08:00
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}
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2007-01-31 17:14:21 +08:00
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if (gr_resp.found == 1)
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1998-01-31 16:39:55 +08:00
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{
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2004-06-06 14:06:02 +08:00
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struct iovec vec[2];
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1998-01-31 16:39:55 +08:00
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char *p = buffer;
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1998-07-25 05:32:39 +08:00
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size_t total_len;
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uintptr_t align;
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2003-03-16 11:22:41 +08:00
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nscd_ssize_t cnt;
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1998-01-31 16:39:55 +08:00
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1998-10-18 23:16:22 +08:00
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/* Now allocate the buffer the array for the group members. We must
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align the pointer. */
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align = ((__alignof__ (char *) - (p - ((char *) 0)))
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& (__alignof__ (char *) - 1));
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2007-01-31 17:14:21 +08:00
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total_len = (align + (1 + gr_resp.gr_mem_cnt) * sizeof (char *)
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+ gr_resp.gr_name_len + gr_resp.gr_passwd_len);
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2014-02-10 21:45:42 +08:00
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if (__glibc_unlikely (buflen < total_len))
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1998-01-31 16:39:55 +08:00
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{
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1998-10-18 23:16:22 +08:00
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no_room:
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1998-01-31 16:39:55 +08:00
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__set_errno (ERANGE);
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2004-02-27 08:55:39 +08:00
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retval = ERANGE;
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2004-09-08 23:46:42 +08:00
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goto out_close;
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1998-01-31 16:39:55 +08:00
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}
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1999-09-06 07:34:47 +08:00
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buflen -= total_len;
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1998-07-25 05:32:39 +08:00
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1998-10-18 23:16:22 +08:00
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p += align;
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2004-08-27 02:35:05 +08:00
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resultbuf->gr_mem = (char **) p;
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2007-01-31 17:14:21 +08:00
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p += (1 + gr_resp.gr_mem_cnt) * sizeof (char *);
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1998-07-25 05:32:39 +08:00
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1998-10-18 23:16:22 +08:00
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/* Set pointers for strings. */
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2004-08-27 02:35:05 +08:00
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resultbuf->gr_name = p;
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2007-01-31 17:14:21 +08:00
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p += gr_resp.gr_name_len;
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2004-08-27 02:35:05 +08:00
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resultbuf->gr_passwd = p;
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2007-01-31 17:14:21 +08:00
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p += gr_resp.gr_passwd_len;
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1998-01-31 16:39:55 +08:00
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1998-10-18 23:16:22 +08:00
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/* Fill in what we know now. */
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2007-01-31 17:14:21 +08:00
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resultbuf->gr_gid = gr_resp.gr_gid;
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1998-07-25 05:32:39 +08:00
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2004-09-08 23:46:42 +08:00
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/* Read the length information, group name, and password. */
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2004-09-30 16:08:40 +08:00
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if (gr_name == NULL)
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2004-09-08 23:46:42 +08:00
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{
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2007-10-14 02:14:58 +08:00
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/* Handle a simple, usual case: no group members. */
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2014-02-10 21:45:42 +08:00
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if (__glibc_likely (gr_resp.gr_mem_cnt == 0))
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2004-09-30 16:08:40 +08:00
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{
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2007-10-14 02:14:58 +08:00
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size_t n = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
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if (__builtin_expect (__readall (sock, resultbuf->gr_name, n)
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!= (ssize_t) n, 0))
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goto out_close;
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}
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else
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{
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/* Allocate array to store lengths. */
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2015-04-09 02:58:58 +08:00
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if (!scratch_buffer_set_array_size
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(&lenbuf, gr_resp.gr_mem_cnt, sizeof (uint32_t)))
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goto out_close;
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len = lenbuf.data;
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2007-10-14 02:14:58 +08:00
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vec[0].iov_base = (void *) len;
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vec[0].iov_len = gr_resp.gr_mem_cnt * sizeof (uint32_t);
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vec[1].iov_base = resultbuf->gr_name;
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vec[1].iov_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
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total_len = vec[0].iov_len + vec[1].iov_len;
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/* Get this data. */
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size_t n = __readvall (sock, vec, 2);
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2014-02-10 21:45:42 +08:00
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if (__glibc_unlikely (n != total_len))
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2007-10-14 02:14:58 +08:00
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goto out_close;
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2004-09-30 16:08:40 +08:00
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}
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2004-09-08 23:46:42 +08:00
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}
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else
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/* We already have the data. Just copy the group name and
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password. */
|
2004-11-10 15:50:03 +08:00
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memcpy (resultbuf->gr_name, gr_name,
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2007-01-31 17:14:21 +08:00
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gr_resp.gr_name_len + gr_resp.gr_passwd_len);
|
1998-07-25 05:32:39 +08:00
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|
1998-10-18 23:16:22 +08:00
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/* Clear the terminating entry. */
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2007-01-31 17:14:21 +08:00
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resultbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;
|
1998-01-31 16:39:55 +08:00
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|
1998-10-18 23:16:22 +08:00
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/* Prepare reading the group members. */
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total_len = 0;
|
2007-01-31 17:14:21 +08:00
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for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
|
1998-01-31 16:39:55 +08:00
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{
|
2004-08-27 02:35:05 +08:00
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resultbuf->gr_mem[cnt] = p;
|
1998-10-18 23:16:22 +08:00
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total_len += len[cnt];
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p += len[cnt];
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1998-01-31 16:39:55 +08:00
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}
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|
2014-02-10 21:45:42 +08:00
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if (__glibc_unlikely (gr_name + gr_name_len + total_len > recend))
|
2007-01-31 17:14:21 +08:00
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{
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/* len array might contain garbage during nscd GC cycle,
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retry rather than fail in that case. */
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if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
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retval = -2;
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goto out_close;
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}
|
2014-02-10 21:45:42 +08:00
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if (__glibc_unlikely (total_len > buflen))
|
2007-01-31 17:14:21 +08:00
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{
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/* len array might contain garbage during nscd GC cycle,
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retry rather than fail in that case. */
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if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
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|
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{
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retval = -2;
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goto out_close;
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}
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else
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goto no_room;
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}
|
1998-01-31 16:39:55 +08:00
|
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|
2004-08-27 02:35:05 +08:00
|
|
|
retval = 0;
|
2007-10-14 02:14:58 +08:00
|
|
|
|
|
|
|
/* If there are no group members TOTAL_LEN is zero. */
|
2007-10-14 17:15:45 +08:00
|
|
|
if (gr_name == NULL)
|
1998-01-31 16:39:55 +08:00
|
|
|
{
|
2007-10-15 11:19:44 +08:00
|
|
|
if (total_len > 0
|
|
|
|
&& __builtin_expect (__readall (sock, resultbuf->gr_mem[0],
|
|
|
|
total_len) != total_len, 0))
|
2004-09-08 23:46:42 +08:00
|
|
|
{
|
2007-10-15 11:19:44 +08:00
|
|
|
/* The `errno' to some value != ERANGE. */
|
|
|
|
__set_errno (ENOENT);
|
|
|
|
retval = ENOENT;
|
2004-09-08 23:46:42 +08:00
|
|
|
}
|
2007-10-15 11:19:44 +08:00
|
|
|
else
|
|
|
|
*result = resultbuf;
|
2007-10-14 17:15:45 +08:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* Copy the group member names. */
|
|
|
|
memcpy (resultbuf->gr_mem[0], gr_name + gr_name_len, total_len);
|
|
|
|
|
|
|
|
/* Try to detect corrupt databases. */
|
|
|
|
if (resultbuf->gr_name[gr_name_len - 1] != '\0'
|
|
|
|
|| resultbuf->gr_passwd[gr_resp.gr_passwd_len - 1] != '\0'
|
|
|
|
|| ({for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
|
|
|
|
if (resultbuf->gr_mem[cnt][len[cnt] - 1] != '\0')
|
|
|
|
break;
|
|
|
|
cnt < gr_resp.gr_mem_cnt; }))
|
2004-11-10 15:50:03 +08:00
|
|
|
{
|
2007-10-14 17:15:45 +08:00
|
|
|
/* We cannot use the database. */
|
|
|
|
retval = mapped->head->gc_cycle != gc_cycle ? -2 : -1;
|
|
|
|
goto out_close;
|
2004-11-10 15:50:03 +08:00
|
|
|
}
|
2007-10-14 17:15:45 +08:00
|
|
|
|
|
|
|
*result = resultbuf;
|
2004-09-08 23:46:42 +08:00
|
|
|
}
|
1998-02-24 23:22:29 +08:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2007-10-14 07:04:40 +08:00
|
|
|
/* Set errno to 0 to indicate no error, just no found record. */
|
|
|
|
__set_errno (0);
|
2004-02-27 08:55:39 +08:00
|
|
|
/* Even though we have not found anything, the result is zero. */
|
|
|
|
retval = 0;
|
1998-01-31 16:39:55 +08:00
|
|
|
}
|
2003-04-28 16:17:29 +08:00
|
|
|
|
2004-09-08 23:46:42 +08:00
|
|
|
out_close:
|
|
|
|
if (sock != -1)
|
|
|
|
close_not_cancel_no_status (sock);
|
2003-04-28 16:17:29 +08:00
|
|
|
out:
|
2007-01-31 17:14:21 +08:00
|
|
|
if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
|
2004-09-30 16:08:40 +08:00
|
|
|
{
|
|
|
|
/* When we come here this means there has been a GC cycle while we
|
|
|
|
were looking for the data. This means the data might have been
|
|
|
|
inconsistent. Retry if possible. */
|
2007-01-31 17:14:21 +08:00
|
|
|
if ((gc_cycle & 1) != 0 || ++nretries == 5 || retval == -1)
|
2004-09-30 16:08:40 +08:00
|
|
|
{
|
|
|
|
/* nscd is just running gc now. Disable using the mapping. */
|
2007-01-31 17:14:21 +08:00
|
|
|
if (atomic_decrement_val (&mapped->counter) == 0)
|
|
|
|
__nscd_unmap (mapped);
|
2004-09-30 16:08:40 +08:00
|
|
|
mapped = NO_MAPPING;
|
|
|
|
}
|
|
|
|
|
2007-01-31 17:14:21 +08:00
|
|
|
if (retval != -1)
|
|
|
|
goto retry;
|
2004-09-30 16:08:40 +08:00
|
|
|
}
|
2003-04-28 16:17:29 +08:00
|
|
|
|
2015-04-09 02:58:58 +08:00
|
|
|
scratch_buffer_free (&lenbuf);
|
|
|
|
|
2004-02-27 08:55:39 +08:00
|
|
|
return retval;
|
1998-01-31 16:39:55 +08:00
|
|
|
}
|