[thirdparty/glibc.git] / nscd / nscd_getgr_r.c

/* Copyright (C) 1998-2023 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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, see
   <https://www.gnu.org/licenses/>.  */

#include <alloca.h>
#include <assert.h>
#include <errno.h>
#include <grp.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <not-cancel.h>
#include <_itoa.h>
#include <scratch_buffer.h>

#include "nscd-client.h"
#include "nscd_proto.h"

int __nss_not_use_nscd_group;

static int nscd_getgr_r (const char *key, size_t keylen, request_type type,
			 struct group *resultbuf, char *buffer,
			 size_t buflen, struct group **result);


int
__nscd_getgrnam_r (const char *name, struct group *resultbuf, char *buffer,
		   size_t buflen, struct group **result)
{
  return nscd_getgr_r (name, strlen (name) + 1, GETGRBYNAME, resultbuf,
		       buffer, buflen, result);
}


int
__nscd_getgrgid_r (gid_t gid, struct group *resultbuf, char *buffer,
		   size_t buflen, struct group **result)
{
  char buf[3 * sizeof (gid_t)];
  buf[sizeof (buf) - 1] = '\0';
  char *cp = _itoa_word (gid, buf + sizeof (buf) - 1, 10, 0);

  return nscd_getgr_r (cp, buf + sizeof (buf) - cp, GETGRBYGID, resultbuf,
		       buffer, buflen, result);
}


libc_locked_map_ptr (,__gr_map_handle) attribute_hidden;
/* Note that we only free the structure if necessary.  The memory
   mapping is not removed since it is not visible to the malloc
   handling.  */
libc_freeres_fn (gr_map_free)
{
  if (__gr_map_handle.mapped != NO_MAPPING)
    {
      void *p = __gr_map_handle.mapped;
      __gr_map_handle.mapped = NO_MAPPING;
      free (p);
    }
}


static int
nscd_getgr_r (const char *key, size_t keylen, request_type type,
	      struct group *resultbuf, char *buffer, size_t buflen,
	      struct group **result)
{
  int gc_cycle;
  int nretries = 0;
  const uint32_t *len = NULL;
  struct scratch_buffer lenbuf;
  scratch_buffer_init (&lenbuf);

  /* If the mapping is available, try to search there instead of
     communicating with the nscd.  */
  struct mapped_database *mapped = __nscd_get_map_ref (GETFDGR, "group",
						       &__gr_map_handle,
						       &gc_cycle);
 retry:;
  const char *gr_name = NULL;
  size_t gr_name_len = 0;
  int retval = -1;
  const char *recend = (const char *) ~UINTMAX_C (0);
  gr_response_header gr_resp;

  if (mapped != NO_MAPPING)
    {
      struct datahead *found = __nscd_cache_search (type, key, keylen, mapped,
						    sizeof gr_resp);
      if (found != NULL)
	{
	  len = (const uint32_t *) (&found->data[0].grdata + 1);
	  gr_resp = found->data[0].grdata;
	  gr_name = ((const char *) len
		     + gr_resp.gr_mem_cnt * sizeof (uint32_t));
	  gr_name_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	  recend = (const char *) found->data + found->recsize;
	  /* Now check if we can trust gr_resp fields.  If GC is
	     in progress, it can contain anything.  */
	  if (mapped->head->gc_cycle != gc_cycle)
	    {
	      retval = -2;
	      goto out;
	    }

	  /* The alignment is always sufficient, unless GC is in progress.  */
	  assert (((uintptr_t) len & (__alignof__ (*len) - 1)) == 0);
	}
    }

  int sock = -1;
  if (gr_name == NULL)
    {
      sock = __nscd_open_socket (key, keylen, type, &gr_resp,
				 sizeof (gr_resp));
      if (sock == -1)
	{
	  __nss_not_use_nscd_group = 1;
	  goto out;
	}
    }

  /* No value found so far.  */
  *result = NULL;

  if (__glibc_unlikely (gr_resp.found == -1))
    {
      /* The daemon does not cache this database.  */
      __nss_not_use_nscd_group = 1;
      goto out_close;
    }

  if (gr_resp.found == 1)
    {
      struct iovec vec[2];
      char *p = buffer;
      size_t total_len;
      uintptr_t align;
      nscd_ssize_t cnt;

      /* Now allocate the buffer the array for the group members.  We must
	 align the pointer.  */
      align = ((__alignof__ (char *) - (p - ((char *) 0)))
	       & (__alignof__ (char *) - 1));
      total_len = (align + (1 + gr_resp.gr_mem_cnt) * sizeof (char *)
		   + gr_resp.gr_name_len + gr_resp.gr_passwd_len);
      if (__glibc_unlikely (buflen < total_len))
	{
	no_room:
	  __set_errno (ERANGE);
	  retval = ERANGE;
	  goto out_close;
	}
      buflen -= total_len;

      p += align;
      resultbuf->gr_mem = (char **) p;
      p += (1 + gr_resp.gr_mem_cnt) * sizeof (char *);

      /* Set pointers for strings.  */
      resultbuf->gr_name = p;
      p += gr_resp.gr_name_len;
      resultbuf->gr_passwd = p;
      p += gr_resp.gr_passwd_len;

      /* Fill in what we know now.  */
      resultbuf->gr_gid = gr_resp.gr_gid;

      /* Read the length information, group name, and password.  */
      if (gr_name == NULL)
	{
	  /* Handle a simple, usual case: no group members.  */
	  if (__glibc_likely (gr_resp.gr_mem_cnt == 0))
	    {
	      size_t n = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	      if (__builtin_expect (__readall (sock, resultbuf->gr_name, n)
				    != (ssize_t) n, 0))
		goto out_close;
	    }
	  else
	    {
	      /* Allocate array to store lengths.  */
	      if (!scratch_buffer_set_array_size
		  (&lenbuf, gr_resp.gr_mem_cnt, sizeof (uint32_t)))
		goto out_close;
	      len = lenbuf.data;

	      vec[0].iov_base = (void *) len;
	      vec[0].iov_len = gr_resp.gr_mem_cnt * sizeof (uint32_t);
	      vec[1].iov_base = resultbuf->gr_name;
	      vec[1].iov_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	      total_len = vec[0].iov_len + vec[1].iov_len;

	      /* Get this data.  */
	      size_t n = __readvall (sock, vec, 2);
	      if (__glibc_unlikely (n != total_len))
		goto out_close;
	    }
	}
      else
	/* We already have the data.  Just copy the group name and
	   password.  */
	memcpy (resultbuf->gr_name, gr_name,
		gr_resp.gr_name_len + gr_resp.gr_passwd_len);

      /* Clear the terminating entry.  */
      resultbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;

      /* Prepare reading the group members.  */
      total_len = 0;
      for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
	{
	  resultbuf->gr_mem[cnt] = p;
	  total_len += len[cnt];
	  p += len[cnt];
	}

      if (__glibc_unlikely (gr_name + gr_name_len + total_len > recend))
	{
	  /* len array might contain garbage during nscd GC cycle,
	     retry rather than fail in that case.  */
	  if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	    retval = -2;
	  goto out_close;
	}
      if (__glibc_unlikely (total_len > buflen))
	{
	  /* len array might contain garbage during nscd GC cycle,
	     retry rather than fail in that case.  */
	  if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	    {
	      retval = -2;
	      goto out_close;
	    }
	  else
	    goto no_room;
	}

      retval = 0;

      /* If there are no group members TOTAL_LEN is zero.  */
      if (gr_name == NULL)
	{
	  if (total_len > 0
	      && __builtin_expect (__readall (sock, resultbuf->gr_mem[0],
					      total_len) != total_len, 0))
	    {
	      /* The `errno' to some value != ERANGE.  */
	      __set_errno (ENOENT);
	      retval = ENOENT;
	    }
	  else
	    *result = resultbuf;
	}
      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; }))
	    {
	      /* We cannot use the database.  */
	      retval = mapped->head->gc_cycle != gc_cycle ? -2 : -1;
	      goto out_close;
	    }

	  *result = resultbuf;
	}
    }
  else
    {
      /* Set errno to 0 to indicate no error, just no found record.  */
      __set_errno (0);
      /* Even though we have not found anything, the result is zero.  */
      retval = 0;
    }

 out_close:
  if (sock != -1)
    __close_nocancel_nostatus (sock);
 out:
  if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
    {
      /* 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.  */
      if ((gc_cycle & 1) != 0 || ++nretries == 5 || retval == -1)
	{
	  /* nscd is just running gc now.  Disable using the mapping.  */
	  if (atomic_fetch_add_relaxed (&mapped->counter, -1) == 1)
	    __nscd_unmap (mapped);
	  mapped = NO_MAPPING;
	}

      if (retval != -1)
	goto retry;
    }

  scratch_buffer_free (&lenbuf);

  return retval;
}
Commit	Line	Data
6d7e8eda	1	/* Copyright (C) 1998-2023 Free Software Foundation, Inc.
d67281a7	2	This file is part of the GNU C Library.
d67281a7 UD	3
d67281a7 UD	4	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	5	modify it under the terms of the GNU Lesser General Public
	6	License as published by the Free Software Foundation; either
	7	version 2.1 of the License, or (at your option) any later version.
d67281a7 UD	8
	9	The GNU C Library is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	12	Lesser General Public License for more details.
d67281a7	13
41bdb6e2	14	You should have received a copy of the GNU Lesser General Public
59ba27a6	15	License along with the GNU C Library; if not, see
5a82c748	16	<https://www.gnu.org/licenses/>. */
d67281a7	17
0891f970	18	#include <alloca.h>
c207f23b	19	#include <assert.h>
d67281a7 UD	20	#include <errno.h>
d67281a7 UD	21	#include <grp.h>
390955cb	22	#include <stdint.h>
d67281a7 UD	23	#include <stdio.h>
	24	#include <stdlib.h>
	25	#include <string.h>
	26	#include <unistd.h>
c207f23b	27	#include <sys/mman.h>
d67281a7	28	#include <sys/socket.h>
264d5b94	29	#include <sys/uio.h>
d67281a7	30	#include <sys/un.h>
40c38b6c	31	#include <not-cancel.h>
eb96ffb0	32	#include <_itoa.h>
561052ad	33	#include <scratch_buffer.h>
d67281a7	34
3f804c95	35	#include "nscd-client.h"
d67281a7 UD	36	#include "nscd_proto.h"
d67281a7 UD	37
ac16e905 UD	38	int __nss_not_use_nscd_group;
ac16e905 UD	39
67479a70 UD	40	static int nscd_getgr_r (const char *key, size_t keylen, request_type type,
67479a70 UD	41	struct group resultbuf, char buffer,
75b3047e	42	size_t buflen, struct group **result);
67479a70	43
d67281a7 UD	44
	45	int
	46	__nscd_getgrnam_r (const char name, struct group resultbuf, char *buffer,
261eada2	47	size_t buflen, struct group **result)
d67281a7	48	{
67479a70	49	return nscd_getgr_r (name, strlen (name) + 1, GETGRBYNAME, resultbuf,
261eada2	50	buffer, buflen, result);
d67281a7 UD	51	}
d67281a7 UD	52
67479a70	53
d67281a7 UD	54	int
d67281a7 UD	55	__nscd_getgrgid_r (gid_t gid, struct group resultbuf, char buffer,
261eada2	56	size_t buflen, struct group **result)
d67281a7	57	{
40c38b6c UD	58	char buf[3 * sizeof (gid_t)];
	59	buf[sizeof (buf) - 1] = '\0';
	60	char *cp = _itoa_word (gid, buf + sizeof (buf) - 1, 10, 0);
d67281a7	61
40c38b6c UD	62	return nscd_getgr_r (cp, buf + sizeof (buf) - cp, GETGRBYGID, resultbuf,
40c38b6c UD	63	buffer, buflen, result);
d67281a7 UD	64	}
d67281a7 UD	65
67479a70	66
6f8a7dff	67	libc_locked_map_ptr (,__gr_map_handle) attribute_hidden;
c207f23b UD	68	/* Note that we only free the structure if necessary. The memory
	69	mapping is not removed since it is not visible to the malloc
	70	handling. */
	71	libc_freeres_fn (gr_map_free)
	72	{
ed2ced8a UD	73	if (__gr_map_handle.mapped != NO_MAPPING)
	74	{
	75	void *p = __gr_map_handle.mapped;
	76	__gr_map_handle.mapped = NO_MAPPING;
	77	free (p);
	78	}
c207f23b UD	79	}
	80
	81
d67281a7	82	static int
67479a70	83	nscd_getgr_r (const char *key, size_t keylen, request_type type,
a95a08b4	84	struct group resultbuf, char buffer, size_t buflen,
261eada2	85	struct group **result)
d67281a7	86	{
c207f23b	87	int gc_cycle;
1a77d37f	88	int nretries = 0;
0891f970	89	const uint32_t *len = NULL;
561052ad FW	90	struct scratch_buffer lenbuf;
561052ad FW	91	scratch_buffer_init (&lenbuf);
c207f23b UD	92
	93	/* If the mapping is available, try to search there instead of
	94	communicating with the nscd. */
	95	struct mapped_database *mapped = __nscd_get_map_ref (GETFDGR, "group",
ed2ced8a UD	96	&__gr_map_handle,
ed2ced8a UD	97	&gc_cycle);
0891f970	98	retry:;
0891f970 UD	99	const char *gr_name = NULL;
	100	size_t gr_name_len = 0;
	101	int retval = -1;
	102	const char recend = (const char ) ~UINTMAX_C (0);
1a77d37f	103	gr_response_header gr_resp;
0891f970	104
c207f23b	105	if (mapped != NO_MAPPING)
ac16e905	106	{
cfe1fc10 JJ	107	struct datahead *found = __nscd_cache_search (type, key, keylen, mapped,
cfe1fc10 JJ	108	sizeof gr_resp);
c207f23b UD	109	if (found != NULL)
c207f23b UD	110	{
1a77d37f JJ	111	len = (const uint32_t *) (&found->data[0].grdata + 1);
1a77d37f JJ	112	gr_resp = found->data[0].grdata;
c207f23b	113	gr_name = ((const char *) len
1a77d37f JJ	114	+ gr_resp.gr_mem_cnt * sizeof (uint32_t));
1a77d37f JJ	115	gr_name_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
c207f23b	116	recend = (const char *) found->data + found->recsize;
1a77d37f JJ	117	/* Now check if we can trust gr_resp fields. If GC is
	118	in progress, it can contain anything. */
	119	if (mapped->head->gc_cycle != gc_cycle)
	120	{
	121	retval = -2;
	122	goto out;
	123	}
	124
	125	/* The alignment is always sufficient, unless GC is in progress. */
	126	assert (((uintptr_t) len & (__alignof__ (*len) - 1)) == 0);
c207f23b UD	127	}
	128	}
	129
c207f23b	130	int sock = -1;
1a77d37f	131	if (gr_name == NULL)
c207f23b	132	{
1a77d37f JJ	133	sock = __nscd_open_socket (key, keylen, type, &gr_resp,
1a77d37f JJ	134	sizeof (gr_resp));
c207f23b UD	135	if (sock == -1)
	136	{
	137	__nss_not_use_nscd_group = 1;
	138	goto out;
	139	}
ac16e905	140	}
d67281a7	141
16aac663 UD	142	/* No value found so far. */
	143	*result = NULL;
	144
a1ffb40e	145	if (__glibc_unlikely (gr_resp.found == -1))
d67281a7	146	{
ac16e905	147	/* The daemon does not cache this database. */
ac16e905	148	__nss_not_use_nscd_group = 1;
c207f23b	149	goto out_close;
d67281a7 UD	150	}
d67281a7 UD	151
1a77d37f	152	if (gr_resp.found == 1)
d67281a7	153	{
40c38b6c	154	struct iovec vec[2];
d67281a7	155	char *p = buffer;
264d5b94 UD	156	size_t total_len;
264d5b94 UD	157	uintptr_t align;
eb64f8cb	158	nscd_ssize_t cnt;
d67281a7	159
67479a70 UD	160	/* Now allocate the buffer the array for the group members. We must
	161	align the pointer. */
	162	align = ((__alignof__ (char ) - (p - ((char ) 0)))
	163	& (__alignof__ (char *) - 1));
1a77d37f JJ	164	total_len = (align + (1 + gr_resp.gr_mem_cnt) * sizeof (char *)
1a77d37f JJ	165	+ gr_resp.gr_name_len + gr_resp.gr_passwd_len);
a1ffb40e	166	if (__glibc_unlikely (buflen < total_len))
d67281a7	167	{
67479a70	168	no_room:
d67281a7	169	__set_errno (ERANGE);
261eada2	170	retval = ERANGE;
c207f23b	171	goto out_close;
d67281a7	172	}
bd952512	173	buflen -= total_len;
264d5b94	174
67479a70	175	p += align;
a95a08b4	176	resultbuf->gr_mem = (char **) p;
1a77d37f	177	p += (1 + gr_resp.gr_mem_cnt) * sizeof (char *);
264d5b94	178
67479a70	179	/* Set pointers for strings. */
a95a08b4	180	resultbuf->gr_name = p;
1a77d37f	181	p += gr_resp.gr_name_len;
a95a08b4	182	resultbuf->gr_passwd = p;
1a77d37f	183	p += gr_resp.gr_passwd_len;
d67281a7	184
67479a70	185	/* Fill in what we know now. */
1a77d37f	186	resultbuf->gr_gid = gr_resp.gr_gid;
264d5b94	187
c207f23b	188	/* Read the length information, group name, and password. */
0891f970	189	if (gr_name == NULL)
c207f23b	190	{
43d3e6bd	191	/* Handle a simple, usual case: no group members. */
a1ffb40e	192	if (__glibc_likely (gr_resp.gr_mem_cnt == 0))
0891f970	193	{
43d3e6bd UD	194	size_t n = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	195	if (__builtin_expect (__readall (sock, resultbuf->gr_name, n)
	196	!= (ssize_t) n, 0))
	197	goto out_close;
	198	}
	199	else
	200	{
	201	/* Allocate array to store lengths. */
561052ad FW	202	if (!scratch_buffer_set_array_size
	203	(&lenbuf, gr_resp.gr_mem_cnt, sizeof (uint32_t)))
	204	goto out_close;
	205	len = lenbuf.data;
43d3e6bd UD	206
	207	vec[0].iov_base = (void *) len;
	208	vec[0].iov_len = gr_resp.gr_mem_cnt * sizeof (uint32_t);
	209	vec[1].iov_base = resultbuf->gr_name;
	210	vec[1].iov_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	211	total_len = vec[0].iov_len + vec[1].iov_len;
	212
	213	/* Get this data. */
	214	size_t n = __readvall (sock, vec, 2);
a1ffb40e	215	if (__glibc_unlikely (n != total_len))
43d3e6bd	216	goto out_close;
0891f970	217	}
c207f23b UD	218	}
	219	else
	220	/* We already have the data. Just copy the group name and
	221	password. */
5429ff76	222	memcpy (resultbuf->gr_name, gr_name,
1a77d37f	223	gr_resp.gr_name_len + gr_resp.gr_passwd_len);
264d5b94	224
67479a70	225	/* Clear the terminating entry. */
1a77d37f	226	resultbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;
d67281a7	227
67479a70 UD	228	/* Prepare reading the group members. */
67479a70 UD	229	total_len = 0;
1a77d37f	230	for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
d67281a7	231	{
a95a08b4	232	resultbuf->gr_mem[cnt] = p;
67479a70 UD	233	total_len += len[cnt];
67479a70 UD	234	p += len[cnt];
d67281a7	235	}
d67281a7	236
a1ffb40e	237	if (__glibc_unlikely (gr_name + gr_name_len + total_len > recend))
1a77d37f JJ	238	{
	239	/* len array might contain garbage during nscd GC cycle,
	240	retry rather than fail in that case. */
	241	if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	242	retval = -2;
	243	goto out_close;
	244	}
a1ffb40e	245	if (__glibc_unlikely (total_len > buflen))
1a77d37f JJ	246	{
	247	/* len array might contain garbage during nscd GC cycle,
	248	retry rather than fail in that case. */
	249	if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	250	{
	251	retval = -2;
	252	goto out_close;
	253	}
	254	else
	255	goto no_room;
	256	}
d67281a7	257
a95a08b4	258	retval = 0;
43d3e6bd UD	259
43d3e6bd UD	260	/* If there are no group members TOTAL_LEN is zero. */
fa76dde2	261	if (gr_name == NULL)
d67281a7	262	{
895a08c0 UD	263	if (total_len > 0
	264	&& __builtin_expect (__readall (sock, resultbuf->gr_mem[0],
	265	total_len) != total_len, 0))
c207f23b	266	{
895a08c0 UD	267	/* The `errno' to some value != ERANGE. */
	268	__set_errno (ENOENT);
	269	retval = ENOENT;
c207f23b	270	}
895a08c0 UD	271	else
895a08c0 UD	272	*result = resultbuf;
fa76dde2 UD	273	}
	274	else
	275	{
	276	/* Copy the group member names. */
	277	memcpy (resultbuf->gr_mem[0], gr_name + gr_name_len, total_len);
	278
	279	/* Try to detect corrupt databases. */
	280	if (resultbuf->gr_name[gr_name_len - 1] != '\0'
	281	\|\| resultbuf->gr_passwd[gr_resp.gr_passwd_len - 1] != '\0'
	282	\|\| ({for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
	283	if (resultbuf->gr_mem[cnt][len[cnt] - 1] != '\0')
	284	break;
	285	cnt < gr_resp.gr_mem_cnt; }))
5429ff76	286	{
fa76dde2 UD	287	/* We cannot use the database. */
	288	retval = mapped->head->gc_cycle != gc_cycle ? -2 : -1;
	289	goto out_close;
5429ff76	290	}
fa76dde2 UD	291
fa76dde2 UD	292	*result = resultbuf;
c207f23b	293	}
14e9dd67 UD	294	}
	295	else
	296	{
cfca0aa3 UD	297	/* Set errno to 0 to indicate no error, just no found record. */
cfca0aa3 UD	298	__set_errno (0);
261eada2 UD	299	/* Even though we have not found anything, the result is zero. */
261eada2 UD	300	retval = 0;
d67281a7	301	}
12c80513	302
c207f23b UD	303	out_close:
c207f23b UD	304	if (sock != -1)
c181840c	305	__close_nocancel_nostatus (sock);
12c80513	306	out:
1a77d37f	307	if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
0891f970 UD	308	{
	309	/* When we come here this means there has been a GC cycle while we
	310	were looking for the data. This means the data might have been
	311	inconsistent. Retry if possible. */
1a77d37f	312	if ((gc_cycle & 1) != 0 \|\| ++nretries == 5 \|\| retval == -1)
0891f970 UD	313	{
0891f970 UD	314	/* nscd is just running gc now. Disable using the mapping. */
a364a3a7	315	if (atomic_fetch_add_relaxed (&mapped->counter, -1) == 1)
1a77d37f	316	__nscd_unmap (mapped);
0891f970 UD	317	mapped = NO_MAPPING;
	318	}
	319
1a77d37f JJ	320	if (retval != -1)
1a77d37f JJ	321	goto retry;
0891f970	322	}
12c80513	323
561052ad FW	324	scratch_buffer_free (&lenbuf);
561052ad FW	325
261eada2	326	return retval;
d67281a7	327	}