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nss: Export nscd hash function as __nss_hash [BZ #22459]

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This commit is contained in:
Florian Weimer 2017-11-23 14:08:11 +01:00
parent cccb6d4e87
commit 67f36c7922
12 changed files with 129 additions and 108 deletions
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18
ChangeLog
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@ -1,3 +1,21 @@
2017-11-23 Florian Weimer <fweimer@redhat.com>
[BZ #22459]
Export nscd hash function as __nss_hash.
* include/nss.h (__nss_hash): Declare.
* nis/nis_hash.c (__nis_hash): Call __nss_hash. Turn into compat
symbol.
* nscd/Makefile (aux, nscd-modules): Remove nscd_hash.
* nscd/cache.c (cache_search, cache_add): Call __nss_hash instead
of __nscd_hash.
* nscd/nscd_helper.c (__nscd_cache_search): Likewise.
* nscd/nscd_hash.h, nscd/nscd_hash.c: Remove files.
* nss/Makefiles (routines): Add nss_hash.
* nss/Versions (GLIBC_PRIVATE): Export __nss_hash.
* nss/nss_hash.c: Rename from nis/nis_hash.c.
(__nss_hash): Rename from __nis_hash. Define hidden alias.
* nis/rpcsvc/nislib.h (__nis_hash): Remove declaration.
2017-11-23 Florian Weimer <fweimer@redhat.com>
[BZ #22478]

14
include/nss.h
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@ -1,9 +1,12 @@
#ifndef _NSS_H
#include <nss/nss.h>
# ifndef _ISOMAC
#ifndef _ISOMAC
#define NSS_INVALID_FIELD_CHARACTERS ":\n"
# include <stddef.h>
# include <stdint.h>
# define NSS_INVALID_FIELD_CHARACTERS ":\n"
extern const char __nss_invalid_field_characters[] attribute_hidden;
_Bool __nss_valid_field (const char *value) attribute_hidden;
@ -11,5 +14,10 @@ _Bool __nss_valid_list_field (char **list) attribute_hidden;
const char *__nss_rewrite_field (const char *value, char **to_be_freed)
attribute_hidden;
# endif /* !_ISOMAC */
/* Compute a hash value for LENGTH bytes starting at KEY. This is the
hash function used by the nscd for the cache mapping files. */
uint32_t __nss_hash (const void *__key, size_t __length);
libc_hidden_proto (__nss_hash)
#endif /* !_ISOMAC */
#endif /* _NSS_H */

67
nis/nis_hash.c
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@ -1,6 +1,6 @@
/* Copyright (c) 1997-2017 Free Software Foundation, Inc.
/* Forward __nis_hash calls to __nss_hash, for ABI compatibility.
Copyright (c) 2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.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
@ -16,61 +16,18 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdint.h>
#include <rpcsvc/nis.h>
#include <shlib-compat.h>
#if SHLIB_COMPAT (libnsl, GLIBC_2_1, GLIBC_2_27)
# include <nss.h>
/* This is from libc/db/hash/hash_func.c, hash3 is static there */
/*
* This is INCREDIBLY ugly, but fast. We break the string up into 8 byte
* units. On the first time through the loop we get the "leftover bytes"
* (strlen % 8). On every other iteration, we perform 8 HASHC's so we handle
* all 8 bytes. Essentially, this saves us 7 cmp & branch instructions. If
* this routine is heavily used enough, it's worth the ugly coding.
*
* OZ's original sdbm hash
*/
uint32_t
__nis_hash (const void *keyarg, size_t len)
{
const u_char *key;
size_t loop;
uint32_t h;
#define HASHC h = *key++ + 65599 * h
h = 0;
key = keyarg;
if (len > 0)
{
loop = (len + 8 - 1) >> 3;
switch (len & (8 - 1))
{
case 0:
do {
HASHC;
/* FALLTHROUGH */
case 7:
HASHC;
/* FALLTHROUGH */
case 6:
HASHC;
/* FALLTHROUGH */
case 5:
HASHC;
/* FALLTHROUGH */
case 4:
HASHC;
/* FALLTHROUGH */
case 3:
HASHC;
/* FALLTHROUGH */
case 2:
HASHC;
/* FALLTHROUGH */
case 1:
HASHC;
} while (--loop);
}
}
return h;
return __nss_hash (keyarg, len);
}
compat_symbol (libnsl, __nis_hash, __nis_hash, GLIBC_2_1);
#endif

1
nis/rpcsvc/nislib.h
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@ -244,7 +244,6 @@ extern uint32_t __nis_default_ttl (char *) __THROW;
extern unsigned int __nis_default_access (char *, unsigned int) __THROW;
extern fd_result *__nis_finddirectory (directory_obj *, const_nis_name) __THROW;
extern void __free_fdresult (fd_result *) __THROW;
extern uint32_t __nis_hash (const void *__keyarg, size_t __len) __THROW;
/* NIS+ cache locking */
extern int __nis_lock_cache (void) __THROW;

4
nscd/Makefile
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@ -25,7 +25,7 @@ include ../Makeconfig
ifneq ($(use-nscd),no)
routines := nscd_getpw_r nscd_getgr_r nscd_gethst_r nscd_getai \
nscd_initgroups nscd_getserv_r nscd_netgroup
aux := nscd_helper nscd_hash
aux := nscd_helper
endif
# To find xmalloc.c
@ -36,7 +36,7 @@ nscd-modules := nscd connections pwdcache getpwnam_r getpwuid_r grpcache \
getsrvbynm_r getsrvbypt_r servicescache \
dbg_log nscd_conf nscd_stat cache mem nscd_setup_thread \
xmalloc xstrdup aicache initgrcache gai res_hconf \
netgroupcache nscd_hash
netgroupcache
ifeq ($(build-nscd)$(have-thread-library),yesyes)

6
nscd/cache.c
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@ -29,10 +29,10 @@
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <nss.h>
#include "nscd.h"
#include "dbg_log.h"
#include "nscd_hash.h"
/* Wrapper functions with error checking for standard functions. */
@ -74,7 +74,7 @@ struct datahead *
cache_search (request_type type, const void *key, size_t len,
struct database_dyn *table, uid_t owner)
{
unsigned long int hash = __nscd_hash (key, len) % table->head->module;
unsigned long int hash = __nss_hash (key, len) % table->head->module;
unsigned long int nsearched = 0;
struct datahead *result = NULL;
@ -153,7 +153,7 @@ cache_add (int type, const void *key, size_t len, struct datahead *packet,
first ? _(" (first)") : "");
}
unsigned long int hash = __nscd_hash (key, len) % table->head->module;
unsigned long int hash = __nss_hash (key, len) % table->head->module;
struct hashentry *newp;
newp = mempool_alloc (table, sizeof (struct hashentry), 0);

19
nscd/nscd_hash.c
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@ -1,19 +0,0 @@
/* Copyright (C) 2017 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
<http://www.gnu.org/licenses/>. */
#define __nis_hash __nscd_hash
#include <nis/nis_hash.c>

21
nscd/nscd_hash.h
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@ -1,21 +0,0 @@
/* Copyright (C) 2017 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
<http://www.gnu.org/licenses/>. */
#include <stdint.h>
extern uint32_t __nscd_hash (const void *__keyarg, size_t __len)
attribute_hidden;

5
nscd/nscd_helper.c
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@ -36,10 +36,9 @@
#include <sys/un.h>
#include <not-cancel.h>
#include <kernel-features.h>
#include <nss.h>
#include "nscd-client.h"
#include "nscd_hash.h"
/* Extra time we wait if the socket is still receiving data. This
value is in milliseconds. Note that the other side is nscd on the
@ -451,7 +450,7 @@ struct datahead *
__nscd_cache_search (request_type type, const char *key, size_t keylen,
const struct mapped_database *mapped, size_t datalen)
{
unsigned long int hash = __nscd_hash (key, keylen) % mapped->head->module;
unsigned long int hash = __nss_hash (key, keylen) % mapped->head->module;
size_t datasize = mapped->datasize;
ref_t trail = mapped->head->array[hash];

2
nss/Makefile
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@ -28,7 +28,7 @@ headers := nss.h
routines = nsswitch getnssent getnssent_r digits_dots \
valid_field valid_list_field rewrite_field \
$(addsuffix -lookup,$(databases)) \
compat-lookup
compat-lookup nss_hash
# These are the databases that go through nss dispatch.
# Caution: if you add a database here, you must add its real name

1
nss/Versions
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@ -15,6 +15,7 @@ libc {
__nss_passwd_lookup2; __nss_group_lookup2; __nss_hosts_lookup2;
__nss_services_lookup2; __nss_next2; __nss_lookup;
__nss_hash;
}
}

79
nss/nss_hash.c Normal file
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@ -0,0 +1,79 @@
/* Copyright (c) 1997-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.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, see
<http://www.gnu.org/licenses/>. */
#include <nss.h>
/* This is from libc/db/hash/hash_func.c, hash3 is static there */
/*
* This is INCREDIBLY ugly, but fast. We break the string up into 8 byte
* units. On the first time through the loop we get the "leftover bytes"
* (strlen % 8). On every other iteration, we perform 8 HASHC's so we handle
* all 8 bytes. Essentially, this saves us 7 cmp & branch instructions. If
* this routine is heavily used enough, it's worth the ugly coding.
*
* OZ's original sdbm hash
*/
uint32_t
__nss_hash (const void *keyarg, size_t len)
{
const unsigned char *key;
size_t loop;
uint32_t h;
#define HASHC h = *key++ + 65599 * h
h = 0;
key = keyarg;
if (len > 0)
{
loop = (len + 8 - 1) >> 3;
switch (len & (8 - 1))
{
case 0:
do
{
HASHC;
/* FALLTHROUGH */
case 7:
HASHC;
/* FALLTHROUGH */
case 6:
HASHC;
/* FALLTHROUGH */
case 5:
HASHC;
/* FALLTHROUGH */
case 4:
HASHC;
/* FALLTHROUGH */
case 3:
HASHC;
/* FALLTHROUGH */
case 2:
HASHC;
/* FALLTHROUGH */
case 1:
HASHC;
}
while (--loop);
}
}
return h;
}
libc_hidden_def (__nss_hash)