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nscd: Do not rebuild getaddrinfo (bug 30709)

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The nscd daemon caches hosts data from NSS modules verbatim, without
filtering protocol families or sorting them (otherwise separate caches
would be needed for certain ai_flags combinations).  The cache
implementation is complete separate from the getaddrinfo code.  This
means that rebuilding getaddrinfo is not needed.  The only function
actually used is __bump_nl_timestamp from check_pf.c, and this change
moves it into nscd/connections.c.

Tested on x86_64-linux-gnu with -fexceptions, built with
build-many-glibcs.py.  I also backported this patch into a distribution
that still supports nscd and verified manually that caching still works.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer 2023-08-11 10:10:16 +02:00
parent 881546979d
commit 039ff51ac7
6 changed files with 13 additions and 80 deletions
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4
include/ifaddrs.h
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@ -34,9 +34,5 @@ extern void __check_native (uint32_t a1_index, int *a1_native,
uint32_t a2_index, int *a2_native)
attribute_hidden;
#if IS_IN (nscd)
extern uint32_t __bump_nl_timestamp (void) attribute_hidden;
#endif
# endif /* !_ISOMAC */
#endif /* ifaddrs.h */

9
inet/check_pf.c
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@ -60,12 +60,3 @@ __free_in6ai (struct in6addrinfo *in6ai)
{
/* Nothing to do. */
}
#if IS_IN (nscd)
uint32_t
__bump_nl_timestamp (void)
{
return 0;
}
#endif

2
nscd/Makefile
View File

@ -35,7 +35,7 @@ nscd-modules := nscd connections pwdcache getpwnam_r getpwuid_r grpcache \
getgrnam_r getgrgid_r hstcache gethstbyad_r gethstbynm3_r \
getsrvbynm_r getsrvbypt_r servicescache \
dbg_log nscd_conf nscd_stat cache mem nscd_setup_thread \
xmalloc xstrdup aicache initgrcache gai res_hconf \
xmalloc xstrdup aicache initgrcache res_hconf \
netgroupcache cachedumper
ifeq ($(build-nscd)$(have-thread-library),yesyes)

11
nscd/connections.c
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@ -256,6 +256,17 @@ int inotify_fd = -1;
#ifdef HAVE_NETLINK
/* Descriptor for netlink status updates. */
static int nl_status_fd = -1;
static uint32_t
__bump_nl_timestamp (void)
{
static uint32_t nl_timestamp;
if (atomic_fetch_add_relaxed (&nl_timestamp, 1) + 1 == 0)
atomic_fetch_add_relaxed (&nl_timestamp, 1);
return nl_timestamp;
}
#endif
/* Number of times clients had to wait. */

50
nscd/gai.c
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@ -1,50 +0,0 @@
/* Copyright (C) 2004-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <https://www.gnu.org/licenses/>. */
#include <alloca.h>
#include <sys/stat.h>
/* This file uses the getaddrinfo code but it compiles it without NSCD
support. We just need a few symbol renames. */
#define __ioctl ioctl
#define __getsockname getsockname
#define __socket socket
#define __recvmsg recvmsg
#define __bind bind
#define __sendto sendto
#define __strchrnul strchrnul
#define __getline getline
#define __qsort_r qsort_r
/* nscd uses 1MB or 2MB thread stacks. */
#define __libc_use_alloca(size) (size <= __MAX_ALLOCA_CUTOFF)
#define __getifaddrs getifaddrs
#define __freeifaddrs freeifaddrs
#undef __fstat64
#define __fstat64 fstat64
#undef __stat64
#define __stat64 stat64
/* We are nscd, so we don't want to be talking to ourselves. */
#undef USE_NSCD
#include <getaddrinfo.c>
/* Support code. */
#include <check_pf.c>
#include <check_native.c>
/* Some variables normally defined in libc. */
nss_action_list __nss_hosts_database attribute_hidden;

17
sysdeps/unix/sysv/linux/check_pf.c
View File

@ -66,25 +66,10 @@ static struct cached_data *cache;
__libc_lock_define_initialized (static, lock);
#if IS_IN (nscd)
static uint32_t nl_timestamp;
uint32_t
__bump_nl_timestamp (void)
{
if (atomic_fetch_add_relaxed (&nl_timestamp, 1) + 1 == 0)
atomic_fetch_add_relaxed (&nl_timestamp, 1);
return nl_timestamp;
}
#endif
static inline uint32_t
get_nl_timestamp (void)
{
#if IS_IN (nscd)
return nl_timestamp;
#elif defined USE_NSCD
#if defined USE_NSCD
return __nscd_get_nl_timestamp ();
#else
return 0;