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nss: Export nscd hash function as __nss_hash [BZ #22459]
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ChangeLog
18
ChangeLog
@ -1,3 +1,21 @@
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2017-11-23 Florian Weimer <fweimer@redhat.com>
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[BZ #22459]
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Export nscd hash function as __nss_hash.
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* include/nss.h (__nss_hash): Declare.
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* nis/nis_hash.c (__nis_hash): Call __nss_hash. Turn into compat
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symbol.
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* nscd/Makefile (aux, nscd-modules): Remove nscd_hash.
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* nscd/cache.c (cache_search, cache_add): Call __nss_hash instead
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of __nscd_hash.
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* nscd/nscd_helper.c (__nscd_cache_search): Likewise.
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* nscd/nscd_hash.h, nscd/nscd_hash.c: Remove files.
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* nss/Makefiles (routines): Add nss_hash.
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* nss/Versions (GLIBC_PRIVATE): Export __nss_hash.
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* nss/nss_hash.c: Rename from nis/nis_hash.c.
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(__nss_hash): Rename from __nis_hash. Define hidden alias.
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* nis/rpcsvc/nislib.h (__nis_hash): Remove declaration.
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2017-11-23 Florian Weimer <fweimer@redhat.com>
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[BZ #22478]
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@ -1,9 +1,12 @@
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#ifndef _NSS_H
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#include <nss/nss.h>
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# ifndef _ISOMAC
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#ifndef _ISOMAC
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#define NSS_INVALID_FIELD_CHARACTERS ":\n"
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# include <stddef.h>
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# include <stdint.h>
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# define NSS_INVALID_FIELD_CHARACTERS ":\n"
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extern const char __nss_invalid_field_characters[] attribute_hidden;
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_Bool __nss_valid_field (const char *value) attribute_hidden;
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@ -11,5 +14,10 @@ _Bool __nss_valid_list_field (char **list) attribute_hidden;
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const char *__nss_rewrite_field (const char *value, char **to_be_freed)
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attribute_hidden;
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# endif /* !_ISOMAC */
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/* Compute a hash value for LENGTH bytes starting at KEY. This is the
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hash function used by the nscd for the cache mapping files. */
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uint32_t __nss_hash (const void *__key, size_t __length);
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libc_hidden_proto (__nss_hash)
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#endif /* !_ISOMAC */
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#endif /* _NSS_H */
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@ -1,6 +1,6 @@
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/* Copyright (c) 1997-2017 Free Software Foundation, Inc.
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/* Forward __nis_hash calls to __nss_hash, for ABI compatibility.
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Copyright (c) 2017 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@suse.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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@ -16,61 +16,18 @@
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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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#include <stdint.h>
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#include <rpcsvc/nis.h>
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libnsl, GLIBC_2_1, GLIBC_2_27)
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# include <nss.h>
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/* This is from libc/db/hash/hash_func.c, hash3 is static there */
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/*
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* This is INCREDIBLY ugly, but fast. We break the string up into 8 byte
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* units. On the first time through the loop we get the "leftover bytes"
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* (strlen % 8). On every other iteration, we perform 8 HASHC's so we handle
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* all 8 bytes. Essentially, this saves us 7 cmp & branch instructions. If
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* this routine is heavily used enough, it's worth the ugly coding.
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*
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* OZ's original sdbm hash
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*/
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uint32_t
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__nis_hash (const void *keyarg, size_t len)
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{
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const u_char *key;
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size_t loop;
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uint32_t h;
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#define HASHC h = *key++ + 65599 * h
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h = 0;
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key = keyarg;
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if (len > 0)
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{
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loop = (len + 8 - 1) >> 3;
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switch (len & (8 - 1))
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{
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case 0:
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do {
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HASHC;
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/* FALLTHROUGH */
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case 7:
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HASHC;
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/* FALLTHROUGH */
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case 6:
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HASHC;
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/* FALLTHROUGH */
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case 5:
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HASHC;
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/* FALLTHROUGH */
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case 4:
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HASHC;
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/* FALLTHROUGH */
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case 3:
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HASHC;
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/* FALLTHROUGH */
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case 2:
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HASHC;
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/* FALLTHROUGH */
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case 1:
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HASHC;
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} while (--loop);
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}
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}
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return h;
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return __nss_hash (keyarg, len);
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}
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compat_symbol (libnsl, __nis_hash, __nis_hash, GLIBC_2_1);
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#endif
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@ -244,7 +244,6 @@ extern uint32_t __nis_default_ttl (char *) __THROW;
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extern unsigned int __nis_default_access (char *, unsigned int) __THROW;
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extern fd_result *__nis_finddirectory (directory_obj *, const_nis_name) __THROW;
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extern void __free_fdresult (fd_result *) __THROW;
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extern uint32_t __nis_hash (const void *__keyarg, size_t __len) __THROW;
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/* NIS+ cache locking */
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extern int __nis_lock_cache (void) __THROW;
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@ -25,7 +25,7 @@ include ../Makeconfig
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ifneq ($(use-nscd),no)
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routines := nscd_getpw_r nscd_getgr_r nscd_gethst_r nscd_getai \
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nscd_initgroups nscd_getserv_r nscd_netgroup
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aux := nscd_helper nscd_hash
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aux := nscd_helper
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endif
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# To find xmalloc.c
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@ -36,7 +36,7 @@ nscd-modules := nscd connections pwdcache getpwnam_r getpwuid_r grpcache \
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getsrvbynm_r getsrvbypt_r servicescache \
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dbg_log nscd_conf nscd_stat cache mem nscd_setup_thread \
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xmalloc xstrdup aicache initgrcache gai res_hconf \
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netgroupcache nscd_hash
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netgroupcache
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ifeq ($(build-nscd)$(have-thread-library),yesyes)
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@ -29,10 +29,10 @@
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <nss.h>
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#include "nscd.h"
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#include "dbg_log.h"
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#include "nscd_hash.h"
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/* Wrapper functions with error checking for standard functions. */
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@ -74,7 +74,7 @@ struct datahead *
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cache_search (request_type type, const void *key, size_t len,
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struct database_dyn *table, uid_t owner)
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{
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unsigned long int hash = __nscd_hash (key, len) % table->head->module;
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unsigned long int hash = __nss_hash (key, len) % table->head->module;
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unsigned long int nsearched = 0;
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struct datahead *result = NULL;
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@ -153,7 +153,7 @@ cache_add (int type, const void *key, size_t len, struct datahead *packet,
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first ? _(" (first)") : "");
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}
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unsigned long int hash = __nscd_hash (key, len) % table->head->module;
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unsigned long int hash = __nss_hash (key, len) % table->head->module;
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struct hashentry *newp;
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newp = mempool_alloc (table, sizeof (struct hashentry), 0);
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@ -1,19 +0,0 @@
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/* Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, see
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<http://www.gnu.org/licenses/>. */
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#define __nis_hash __nscd_hash
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#include <nis/nis_hash.c>
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@ -1,21 +0,0 @@
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/* Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, see
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<http://www.gnu.org/licenses/>. */
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#include <stdint.h>
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extern uint32_t __nscd_hash (const void *__keyarg, size_t __len)
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attribute_hidden;
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#include <sys/un.h>
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#include <not-cancel.h>
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#include <kernel-features.h>
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#include <nss.h>
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#include "nscd-client.h"
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#include "nscd_hash.h"
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/* Extra time we wait if the socket is still receiving data. This
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value is in milliseconds. Note that the other side is nscd on the
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@ -451,7 +450,7 @@ struct datahead *
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__nscd_cache_search (request_type type, const char *key, size_t keylen,
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const struct mapped_database *mapped, size_t datalen)
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{
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unsigned long int hash = __nscd_hash (key, keylen) % mapped->head->module;
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unsigned long int hash = __nss_hash (key, keylen) % mapped->head->module;
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size_t datasize = mapped->datasize;
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ref_t trail = mapped->head->array[hash];
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@ -28,7 +28,7 @@ headers := nss.h
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routines = nsswitch getnssent getnssent_r digits_dots \
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valid_field valid_list_field rewrite_field \
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$(addsuffix -lookup,$(databases)) \
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compat-lookup
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compat-lookup nss_hash
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# These are the databases that go through nss dispatch.
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# Caution: if you add a database here, you must add its real name
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@ -15,6 +15,7 @@ libc {
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__nss_passwd_lookup2; __nss_group_lookup2; __nss_hosts_lookup2;
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__nss_services_lookup2; __nss_next2; __nss_lookup;
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__nss_hash;
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}
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}
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79
nss/nss_hash.c
Normal file
79
nss/nss_hash.c
Normal file
@ -0,0 +1,79 @@
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/* Copyright (c) 1997-2017 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@suse.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, see
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<http://www.gnu.org/licenses/>. */
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#include <nss.h>
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/* This is from libc/db/hash/hash_func.c, hash3 is static there */
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/*
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* This is INCREDIBLY ugly, but fast. We break the string up into 8 byte
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* units. On the first time through the loop we get the "leftover bytes"
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* (strlen % 8). On every other iteration, we perform 8 HASHC's so we handle
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* all 8 bytes. Essentially, this saves us 7 cmp & branch instructions. If
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* this routine is heavily used enough, it's worth the ugly coding.
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*
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* OZ's original sdbm hash
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*/
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uint32_t
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__nss_hash (const void *keyarg, size_t len)
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{
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const unsigned char *key;
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size_t loop;
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uint32_t h;
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#define HASHC h = *key++ + 65599 * h
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h = 0;
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key = keyarg;
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if (len > 0)
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{
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loop = (len + 8 - 1) >> 3;
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switch (len & (8 - 1))
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{
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case 0:
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do
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{
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HASHC;
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/* FALLTHROUGH */
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case 7:
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HASHC;
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/* FALLTHROUGH */
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case 6:
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HASHC;
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/* FALLTHROUGH */
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case 5:
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HASHC;
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/* FALLTHROUGH */
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case 4:
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HASHC;
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/* FALLTHROUGH */
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case 3:
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HASHC;
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/* FALLTHROUGH */
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case 2:
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HASHC;
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/* FALLTHROUGH */
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case 1:
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HASHC;
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}
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while (--loop);
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}
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}
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return h;
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}
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libc_hidden_def (__nss_hash)
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