Date: Mon, 8 Oct 2012 11:52:30 -0500 From: Brooks Davis <brooks@freebsd.org> To: freebsd-arch@freebsd.org Subject: [CFT] Importing NetBSD's pwcache(3) Message-ID: <20121008165230.GD23400@lor.one-eyed-alien.net>
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I'm planning to import NetBSD's implementation and expansion
of pwcache(3). The main feature is that it adds is the new
functions gid_from_group(), pwcache_userdb(), pwcache_groupdb(), and
uid_from_user(). The *_from_*() functions do what you'd expect. The
pwcache*() functions allow you to implement alternative lookup
functions.
NetBSD's mtree and install use them to support alternate master.passwd
and group files. They use it to support image creation on non-NetBSD
systems. In principle this could eliminate the need to run mergemaster
before installworld after a new user or group is added to the system
(assuming of course that the admin isn't randomly renumbering users and
groups).
If you wish to test this patch, apply it and then delete
lib/libc/gen/pwcache.[3c] so the new versions in contrib are found.
The actual commit will include a copy from
vendor/NetBSD/libc-pwcache/dist to contrib/libc-pwcache.
Thanks,
Brooks
Index: lib/libc/gen/Makefile.inc
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- lib/libc/gen/Makefile.inc (revision 241235)
+++ lib/libc/gen/Makefile.inc (working copy)
@@ -24,7 +24,7 @@
lockf.c lrand48.c mrand48.c nftw.c nice.c \
nlist.c nrand48.c opendir.c \
pause.c pmadvise.c popen.c posix_spawn.c \
- psignal.c pututxline.c pw_scan.c pwcache.c \
+ psignal.c pututxline.c pw_scan.c \
raise.c readdir.c readpassphrase.c rewinddir.c \
scandir.c seed48.c seekdir.c semctl.c \
setdomainname.c sethostname.c setjmperr.c setmode.c \
@@ -36,6 +36,9 @@
usleep.c utime.c utxdb.c valloc.c vis.c wait.c wait3.c waitpid.c \
wordexp.c
=20
+.PATH: ${.CURDIR}/../../contrib/libc-pwcache
+SRCS+=3D pwcache.c pwcache.h
+
MISRCS+=3Dmodf.c
=20
CANCELPOINTS_SRCS=3Dsem.c sem_new.c
Index: lib/libc/gen/pwcache.3
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- lib/libc/gen/pwcache.3 (revision 241235)
+++ lib/libc/gen/pwcache.3 (working copy)
@@ -1,93 +0,0 @@
-.\" Copyright (c) 1989, 1991, 1993
-.\" The Regents of the University of California. All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\" notice, this list of conditions and the following disclaimer in the
-.\" documentation and/or other materials provided with the distribution.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\" may be used to endorse or promote products derived from this softwa=
re
-.\" without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PUR=
POSE
-.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIAB=
LE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUEN=
TIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, ST=
RICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY =
WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" @(#)pwcache.3 8.1 (Berkeley) 6/9/93
-.\" $FreeBSD$
-.\"
-.Dd March 22, 2002
-.Dt PWCACHE 3
-.Os
-.Sh NAME
-.Nm pwcache
-.Nd cache password and group entries
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In pwd.h
-.Ft const char *
-.Fn user_from_uid "uid_t uid" "int nouser"
-.In grp.h
-.Ft const char *
-.Fn group_from_gid "gid_t gid" "int nogroup"
-.Sh DESCRIPTION
-The
-.Fn user_from_uid
-function returns the user name associated with the argument
-.Fa uid .
-The user name is cached so that multiple calls with the same
-.Fa uid
-do not require additional calls to
-.Xr getpwuid 3 .
-If there is no user associated with the
-.Fa uid ,
-a pointer is returned
-to a string representation of the
-.Fa uid ,
-unless the argument
-.Fa nouser
-is non-zero, in which case a
-.Dv NULL
-pointer is returned.
-.Pp
-The
-.Fn group_from_gid
-function returns the group name associated with the argument
-.Fa gid .
-The group name is cached so that multiple calls with the same
-.Fa gid
-do not require additional calls to
-.Xr getgrgid 3 .
-If there is no group associated with the
-.Fa gid ,
-a pointer is returned
-to a string representation of the
-.Fa gid ,
-unless the argument
-.Fa nogroup
-is non-zero, in which case a
-.Dv NULL
-pointer is returned.
-.Sh SEE ALSO
-.Xr getgrgid 3 ,
-.Xr getpwuid 3
-.Sh HISTORY
-The
-.Fn user_from_uid
-and
-.Fn group_from_gid
-functions first appeared in
-.Bx 4.4 .
Index: lib/libc/gen/pwcache.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- lib/libc/gen/pwcache.c (revision 241235)
+++ lib/libc/gen/pwcache.c (working copy)
@@ -1,113 +0,0 @@
-/*
- * Copyright (c) 1989, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURP=
OSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENT=
IAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STR=
ICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY W=
AY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] =3D "@(#)pwcache.c 8.1 (Berkeley) 6/4/93";
-#endif /* LIBC_SCCS and not lint */
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/param.h>
-#include <sys/types.h>
-
-#include <grp.h>
-#include <pwd.h>
-#include <stdio.h>
-#include <string.h>
-
-#define NCACHE 64 /* power of 2 */
-#define MASK (NCACHE - 1) /* bits to store with */
-
-const char *
-user_from_uid(uid_t uid, int nouser)
-{
- static struct ncache {
- uid_t uid;
- int found;
- char name[MAXLOGNAME];
- } c_uid[NCACHE];
- static int pwopen;
- struct passwd *pw;
- struct ncache *cp;
-
- cp =3D c_uid + (uid & MASK);
- if (cp->uid !=3D uid || !*cp->name) {
- if (pwopen =3D=3D 0) {
- setpassent(1);
- pwopen =3D 1;
- }
- pw =3D getpwuid(uid);
- cp->uid =3D uid;
- if (pw !=3D NULL) {
- cp->found =3D 1;
- (void)strncpy(cp->name, pw->pw_name, MAXLOGNAME - 1);
- cp->name[MAXLOGNAME - 1] =3D '\0';
- } else {
- cp->found =3D 0;
- (void)snprintf(cp->name, MAXLOGNAME - 1, "%u", uid);
- if (nouser)
- return (NULL);
- }
- }
- return ((nouser && !cp->found) ? NULL : cp->name);
-}
-
-const char *
-group_from_gid(gid_t gid, int nogroup)
-{
- static struct ncache {
- gid_t gid;
- int found;
- char name[MAXLOGNAME];
- } c_gid[NCACHE];
- static int gropen;
- struct group *gr;
- struct ncache *cp;
-
- cp =3D c_gid + (gid & MASK);
- if (cp->gid !=3D gid || !*cp->name) {
- if (gropen =3D=3D 0) {
- setgroupent(1);
- gropen =3D 1;
- }
- gr =3D getgrgid(gid);
- cp->gid =3D gid;
- if (gr !=3D NULL) {
- cp->found =3D 1;
- (void)strncpy(cp->name, gr->gr_name, MAXLOGNAME - 1);
- cp->name[MAXLOGNAME - 1] =3D '\0';
- } else {
- cp->found =3D 0;
- (void)snprintf(cp->name, MAXLOGNAME - 1, "%u", gid);
- if (nogroup)
- return (NULL);
- }
- }
- return ((nogroup && !cp->found) ? NULL : cp->name);
-}
Index: lib/libc/gen/Symbol.map
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- lib/libc/gen/Symbol.map (revision 241235)
+++ lib/libc/gen/Symbol.map (working copy)
@@ -387,6 +387,10 @@
fdlopen;
__FreeBSD_libc_enter_restricted_mode;
getcontextx;
+ gid_from_group;
+ pwcache_userdb;
+ pwcache_groupdb;
+ uid_from_user;
};
=20
FBSDprivate_1.0 {
Index: include/pwd.h
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- include/pwd.h (revision 241235)
+++ include/pwd.h (working copy)
@@ -165,6 +165,10 @@
int getpwent_r(struct passwd *, char *, size_t, struct passwd **);
int setpassent(int);
const char *user_from_uid(uid_t, int);
+int uid_from_user(const char *, uid_t *);
+int pwcache_userdb(int (*)(int), void (*)(void),
+ struct passwd * (*)(const char *),
+ struct passwd * (*)(uid_t));
#endif
__END_DECLS
=20
Index: include/grp.h
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- include/grp.h (revision 241235)
+++ include/grp.h (working copy)
@@ -69,6 +69,10 @@
struct group *getgrnam(const char *);
#if __BSD_VISIBLE
const char *group_from_gid(gid_t, int);
+int gid_from_group(const char *, gid_t *);
+int pwcache_groupdb(int (*)(int), void (*)(void),
+ struct group * (*)(const char *),
+ struct group * (*)(gid_t));
#endif
#if __BSD_VISIBLE || __XSI_VISIBLE
/* XXX IEEE Std 1003.1, 2003 specifies `void setgrent(void)' */
Index: contrib/libc-pwcache/pwcache.h
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- contrib/libc-pwcache/pwcache.h (revision 0)
+++ contrib/libc-pwcache/pwcache.h (working copy)
@@ -0,0 +1,73 @@
+/* $NetBSD: pwcache.h,v 1.5 2003/11/10 08:51:51 wiz Exp $ */
+/* $FreeBSD$ */
+
+/*-
+ * Copyright (c) 1992 Keith Muller.
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Keith Muller of the University of California, San Diego.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURP=
OSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENT=
IAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STR=
ICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY W=
AY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)cache.h 8.1 (Berkeley) 5/31/93
+ */
+
+/*
+ * Constants and data structures used to implement group and password file
+ * caches. Traditional passwd/group cache routines perform quite poorly wi=
th
+ * archives. The chances of hitting a valid lookup with an archive is quit=
e a
+ * bit worse than with files already resident on the file system. These mi=
sses
+ * create a MAJOR performance cost. To address this problem, these routines
+ * cache both hits and misses.
+ *
+ * NOTE: name lengths must be as large as those stored in ANY PROTOCOL and
+ * as stored in the passwd and group files. CACHE SIZES MUST BE PRIME
+ */
+#define UNMLEN 32 /* >=3D user name found in any protocol */
+#define GNMLEN 32 /* >=3D group name found in any protocol */
+#define UID_SZ 317 /* size of uid to user_name cache */
+#define UNM_SZ 317 /* size of user_name to uid cache */
+#define GID_SZ 251 /* size of gid to group_name cache */
+#define GNM_SZ 251 /* size of group_name to gid cache */
+#define VALID 1 /* entry and name are valid */
+#define INVALID 2 /* entry valid, name NOT valid */
+
+/*
+ * Node structures used in the user, group, uid, and gid caches.
+ */
+
+typedef struct uidc {
+ int valid; /* is this a valid or a miss entry */
+ char name[UNMLEN]; /* uid name */
+ uid_t uid; /* cached uid */
+} UIDC;
+
+typedef struct gidc {
+ int valid; /* is this a valid or a miss entry */
+ char name[GNMLEN]; /* gid name */
+ gid_t gid; /* cached gid */
+} GIDC;
Property changes on: contrib/libc-pwcache/pwcache.h
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Added: svn:mime-type
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Index: contrib/libc-pwcache/pwcache.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- contrib/libc-pwcache/pwcache.c (revision 0)
+++ contrib/libc-pwcache/pwcache.c (working copy)
@@ -0,0 +1,646 @@
+/* $NetBSD: pwcache.c,v 1.31 2010/03/23 20:28:59 drochner Exp $ */
+
+/*-
+ * Copyright (c) 1992 Keith Muller.
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Keith Muller of the University of California, San Diego.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURP=
OSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENT=
IAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STR=
ICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY W=
AY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*-
+ * Copyright (c) 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTO=
RS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIM=
ITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICU=
LAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTO=
RS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF =
THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if HAVE_NBTOOL_CONFIG_H
+#include "nbtool_config.h"
+/*
+ * XXX Undefine the renames of these functions so that we don't
+ * XXX rename the versions found in the host's <pwd.h> by mistake!
+ */
+#undef group_from_gid
+#undef user_from_uid
+#endif
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] =3D "@(#)cache.c 8.1 (Berkeley) 5/31/93";
+#else
+__RCSID("$NetBSD: pwcache.c,v 1.31 2010/03/23 20:28:59 drochner Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+__FBSDID("$FreeBSD$");
+
+#include "namespace.h"
+
+#include <sys/types.h>
+#include <sys/param.h>
+
+#include <assert.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define _DIAGASSERT(x) assert((x))
+
+#if HAVE_NBTOOL_CONFIG_H
+/* XXX Now, re-apply the renaming that we undid above. */
+#define group_from_gid __nbcompat_group_from_gid
+#define user_from_uid __nbcompat_user_from_uid
+#endif
+
+#ifdef __weak_alias
+__weak_alias(user_from_uid,_user_from_uid)
+__weak_alias(group_from_gid,_group_from_gid)
+__weak_alias(pwcache_groupdb,_pwcache_groupdb)
+#endif
+
+#if !HAVE_PWCACHE_USERDB || HAVE_NBTOOL_CONFIG_H
+#include "pwcache.h"
+
+/*
+ * routines that control user, group, uid and gid caches (for the archive
+ * member print routine).
+ * IMPORTANT:
+ * these routines cache BOTH hits and misses, a major performance improvem=
ent
+ */
+
+/*
+ * function pointers to various name lookup routines.
+ * these may be changed as necessary.
+ */
+static int (*_pwcache_setgroupent)(int) =3D setgroupent;
+static void (*_pwcache_endgrent)(void) =3D endgrent;
+static struct group * (*_pwcache_getgrnam)(const char *) =3D getgrnam;
+static struct group * (*_pwcache_getgrgid)(gid_t) =3D getgrgid;
+static int (*_pwcache_setpassent)(int) =3D setpassent;
+static void (*_pwcache_endpwent)(void) =3D endpwent;
+static struct passwd * (*_pwcache_getpwnam)(const char *) =3D getpwnam;
+static struct passwd * (*_pwcache_getpwuid)(uid_t) =3D getpwuid;
+
+/*
+ * internal state
+ */
+static int pwopn; /* is password file open */
+static int gropn; /* is group file open */
+static UIDC **uidtb; /* uid to name cache */
+static GIDC **gidtb; /* gid to name cache */
+static UIDC **usrtb; /* user name to uid cache */
+static GIDC **grptb; /* group name to gid cache */
+
+static int uidtb_fail; /* uidtb_start() failed ? */
+static int gidtb_fail; /* gidtb_start() failed ? */
+static int usrtb_fail; /* usrtb_start() failed ? */
+static int grptb_fail; /* grptb_start() failed ? */
+
+
+static u_int st_hash(const char *, size_t, int);
+static int uidtb_start(void);
+static int gidtb_start(void);
+static int usrtb_start(void);
+static int grptb_start(void);
+
+
+static u_int
+st_hash(const char *name, size_t len, int tabsz)
+{
+ u_int key =3D 0;
+
+ _DIAGASSERT(name !=3D NULL);
+
+ while (len--) {
+ key +=3D *name++;
+ key =3D (key << 8) | (key >> 24);
+ }
+
+ return (key % tabsz);
+}
+
+/*
+ * uidtb_start
+ * creates an an empty uidtb
+ * Return:
+ * 0 if ok, -1 otherwise
+ */
+static int
+uidtb_start(void)
+{
+
+ if (uidtb !=3D NULL)
+ return (0);
+ if (uidtb_fail)
+ return (-1);
+ if ((uidtb =3D (UIDC **)calloc(UID_SZ, sizeof(UIDC *))) =3D=3D NULL) {
+ ++uidtb_fail;
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * gidtb_start
+ * creates an an empty gidtb
+ * Return:
+ * 0 if ok, -1 otherwise
+ */
+static int
+gidtb_start(void)
+{
+
+ if (gidtb !=3D NULL)
+ return (0);
+ if (gidtb_fail)
+ return (-1);
+ if ((gidtb =3D (GIDC **)calloc(GID_SZ, sizeof(GIDC *))) =3D=3D NULL) {
+ ++gidtb_fail;
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * usrtb_start
+ * creates an an empty usrtb
+ * Return:
+ * 0 if ok, -1 otherwise
+ */
+static int
+usrtb_start(void)
+{
+
+ if (usrtb !=3D NULL)
+ return (0);
+ if (usrtb_fail)
+ return (-1);
+ if ((usrtb =3D (UIDC **)calloc(UNM_SZ, sizeof(UIDC *))) =3D=3D NULL) {
+ ++usrtb_fail;
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * grptb_start
+ * creates an an empty grptb
+ * Return:
+ * 0 if ok, -1 otherwise
+ */
+static int
+grptb_start(void)
+{
+
+ if (grptb !=3D NULL)
+ return (0);
+ if (grptb_fail)
+ return (-1);
+ if ((grptb =3D (GIDC **)calloc(GNM_SZ, sizeof(GIDC *))) =3D=3D NULL) {
+ ++grptb_fail;
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * user_from_uid()
+ * caches the name (if any) for the uid. If noname clear, we always
+ * return the stored name (if valid or invalid match).
+ * We use a simple hash table.
+ * Return
+ * Pointer to stored name (or a empty string)
+ */
+const char *
+user_from_uid(uid_t uid, int noname)
+{
+ struct passwd *pw;
+ UIDC *ptr, **pptr;
+
+ if ((uidtb =3D=3D NULL) && (uidtb_start() < 0))
+ return (NULL);
+
+ /*
+ * see if we have this uid cached
+ */
+ pptr =3D uidtb + (uid % UID_SZ);
+ ptr =3D *pptr;
+
+ if ((ptr !=3D NULL) && (ptr->valid > 0) && (ptr->uid =3D=3D uid)) {
+ /*
+ * have an entry for this uid
+ */
+ if (!noname || (ptr->valid =3D=3D VALID))
+ return (ptr->name);
+ return (NULL);
+ }
+
+ /*
+ * No entry for this uid, we will add it
+ */
+ if (!pwopn) {
+ if (_pwcache_setpassent !=3D NULL)
+ (*_pwcache_setpassent)(1);
+ ++pwopn;
+ }
+
+ if (ptr =3D=3D NULL)
+ *pptr =3D ptr =3D (UIDC *)malloc(sizeof(UIDC));
+
+ if ((pw =3D (*_pwcache_getpwuid)(uid)) =3D=3D NULL) {
+ /*
+ * no match for this uid in the local password file
+ * a string that is the uid in numeric format
+ */
+ if (ptr =3D=3D NULL)
+ return (NULL);
+ ptr->uid =3D uid;
+ (void)snprintf(ptr->name, UNMLEN, "%lu", (long) uid);
+ ptr->valid =3D INVALID;
+ if (noname)
+ return (NULL);
+ } else {
+ /*
+ * there is an entry for this uid in the password file
+ */
+ if (ptr =3D=3D NULL)
+ return (pw->pw_name);
+ ptr->uid =3D uid;
+ (void)strlcpy(ptr->name, pw->pw_name, UNMLEN);
+ ptr->valid =3D VALID;
+ }
+ return (ptr->name);
+}
+
+/*
+ * group_from_gid()
+ * caches the name (if any) for the gid. If noname clear, we always
+ * return the stored name (if valid or invalid match).
+ * We use a simple hash table.
+ * Return
+ * Pointer to stored name (or a empty string)
+ */
+const char *
+group_from_gid(gid_t gid, int noname)
+{
+ struct group *gr;
+ GIDC *ptr, **pptr;
+
+ if ((gidtb =3D=3D NULL) && (gidtb_start() < 0))
+ return (NULL);
+
+ /*
+ * see if we have this gid cached
+ */
+ pptr =3D gidtb + (gid % GID_SZ);
+ ptr =3D *pptr;
+
+ if ((ptr !=3D NULL) && (ptr->valid > 0) && (ptr->gid =3D=3D gid)) {
+ /*
+ * have an entry for this gid
+ */
+ if (!noname || (ptr->valid =3D=3D VALID))
+ return (ptr->name);
+ return (NULL);
+ }
+
+ /*
+ * No entry for this gid, we will add it
+ */
+ if (!gropn) {
+ if (_pwcache_setgroupent !=3D NULL)
+ (*_pwcache_setgroupent)(1);
+ ++gropn;
+ }
+
+ if (ptr =3D=3D NULL)
+ *pptr =3D ptr =3D (GIDC *)malloc(sizeof(GIDC));
+
+ if ((gr =3D (*_pwcache_getgrgid)(gid)) =3D=3D NULL) {
+ /*
+ * no match for this gid in the local group file, put in
+ * a string that is the gid in numberic format
+ */
+ if (ptr =3D=3D NULL)
+ return (NULL);
+ ptr->gid =3D gid;
+ (void)snprintf(ptr->name, GNMLEN, "%lu", (long) gid);
+ ptr->valid =3D INVALID;
+ if (noname)
+ return (NULL);
+ } else {
+ /*
+ * there is an entry for this group in the group file
+ */
+ if (ptr =3D=3D NULL)
+ return (gr->gr_name);
+ ptr->gid =3D gid;
+ (void)strlcpy(ptr->name, gr->gr_name, GNMLEN);
+ ptr->valid =3D VALID;
+ }
+ return (ptr->name);
+}
+
+/*
+ * uid_from_user()
+ * caches the uid for a given user name. We use a simple hash table.
+ * Return
+ * the uid (if any) for a user name, or a -1 if no match can be found
+ */
+int
+uid_from_user(const char *name, uid_t *uid)
+{
+ struct passwd *pw;
+ UIDC *ptr, **pptr;
+ size_t namelen;
+
+ /*
+ * return -1 for mangled names
+ */
+ if (name =3D=3D NULL || ((namelen =3D strlen(name)) =3D=3D 0))
+ return (-1);
+ if ((usrtb =3D=3D NULL) && (usrtb_start() < 0))
+ return (-1);
+
+ /*
+ * look up in hash table, if found and valid return the uid,
+ * if found and invalid, return a -1
+ */
+ pptr =3D usrtb + st_hash(name, namelen, UNM_SZ);
+ ptr =3D *pptr;
+
+ if ((ptr !=3D NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
+ if (ptr->valid =3D=3D INVALID)
+ return (-1);
+ *uid =3D ptr->uid;
+ return (0);
+ }
+
+ if (!pwopn) {
+ if (_pwcache_setpassent !=3D NULL)
+ (*_pwcache_setpassent)(1);
+ ++pwopn;
+ }
+
+ if (ptr =3D=3D NULL)
+ *pptr =3D ptr =3D (UIDC *)malloc(sizeof(UIDC));
+
+ /*
+ * no match, look it up, if no match store it as an invalid entry,
+ * or store the matching uid
+ */
+ if (ptr =3D=3D NULL) {
+ if ((pw =3D (*_pwcache_getpwnam)(name)) =3D=3D NULL)
+ return (-1);
+ *uid =3D pw->pw_uid;
+ return (0);
+ }
+ (void)strlcpy(ptr->name, name, UNMLEN);
+ if ((pw =3D (*_pwcache_getpwnam)(name)) =3D=3D NULL) {
+ ptr->valid =3D INVALID;
+ return (-1);
+ }
+ ptr->valid =3D VALID;
+ *uid =3D ptr->uid =3D pw->pw_uid;
+ return (0);
+}
+
+/*
+ * gid_from_group()
+ * caches the gid for a given group name. We use a simple hash table.
+ * Return
+ * the gid (if any) for a group name, or a -1 if no match can be found
+ */
+int
+gid_from_group(const char *name, gid_t *gid)
+{
+ struct group *gr;
+ GIDC *ptr, **pptr;
+ size_t namelen;
+
+ /*
+ * return -1 for mangled names
+ */
+ if (name =3D=3D NULL || ((namelen =3D strlen(name)) =3D=3D 0))
+ return (-1);
+ if ((grptb =3D=3D NULL) && (grptb_start() < 0))
+ return (-1);
+
+ /*
+ * look up in hash table, if found and valid return the uid,
+ * if found and invalid, return a -1
+ */
+ pptr =3D grptb + st_hash(name, namelen, GID_SZ);
+ ptr =3D *pptr;
+
+ if ((ptr !=3D NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
+ if (ptr->valid =3D=3D INVALID)
+ return (-1);
+ *gid =3D ptr->gid;
+ return (0);
+ }
+
+ if (!gropn) {
+ if (_pwcache_setgroupent !=3D NULL)
+ (*_pwcache_setgroupent)(1);
+ ++gropn;
+ }
+
+ if (ptr =3D=3D NULL)
+ *pptr =3D ptr =3D (GIDC *)malloc(sizeof(GIDC));
+
+ /*
+ * no match, look it up, if no match store it as an invalid entry,
+ * or store the matching gid
+ */
+ if (ptr =3D=3D NULL) {
+ if ((gr =3D (*_pwcache_getgrnam)(name)) =3D=3D NULL)
+ return (-1);
+ *gid =3D gr->gr_gid;
+ return (0);
+ }
+
+ (void)strlcpy(ptr->name, name, GNMLEN);
+ if ((gr =3D (*_pwcache_getgrnam)(name)) =3D=3D NULL) {
+ ptr->valid =3D INVALID;
+ return (-1);
+ }
+ ptr->valid =3D VALID;
+ *gid =3D ptr->gid =3D gr->gr_gid;
+ return (0);
+}
+
+#define FLUSHTB(arr, len, fail) \
+ do { \
+ if (arr !=3D NULL) { \
+ for (i =3D 0; i < len; i++) \
+ if (arr[i] !=3D NULL) \
+ free(arr[i]); \
+ arr =3D NULL; \
+ } \
+ fail =3D 0; \
+ } while (/* CONSTCOND */0);
+
+int
+pwcache_userdb(
+ int (*a_setpassent)(int),
+ void (*a_endpwent)(void),
+ struct passwd * (*a_getpwnam)(const char *),
+ struct passwd * (*a_getpwuid)(uid_t))
+{
+ int i;
+
+ /* a_setpassent and a_endpwent may be NULL */
+ if (a_getpwnam =3D=3D NULL || a_getpwuid =3D=3D NULL)
+ return (-1);
+
+ if (_pwcache_endpwent !=3D NULL)
+ (*_pwcache_endpwent)();
+ FLUSHTB(uidtb, UID_SZ, uidtb_fail);
+ FLUSHTB(usrtb, UNM_SZ, usrtb_fail);
+ pwopn =3D 0;
+ _pwcache_setpassent =3D a_setpassent;
+ _pwcache_endpwent =3D a_endpwent;
+ _pwcache_getpwnam =3D a_getpwnam;
+ _pwcache_getpwuid =3D a_getpwuid;
+
+ return (0);
+}
+
+int
+pwcache_groupdb(
+ int (*a_setgroupent)(int),
+ void (*a_endgrent)(void),
+ struct group * (*a_getgrnam)(const char *),
+ struct group * (*a_getgrgid)(gid_t))
+{
+ int i;
+
+ /* a_setgroupent and a_endgrent may be NULL */
+ if (a_getgrnam =3D=3D NULL || a_getgrgid =3D=3D NULL)
+ return (-1);
+
+ if (_pwcache_endgrent !=3D NULL)
+ (*_pwcache_endgrent)();
+ FLUSHTB(gidtb, GID_SZ, gidtb_fail);
+ FLUSHTB(grptb, GNM_SZ, grptb_fail);
+ gropn =3D 0;
+ _pwcache_setgroupent =3D a_setgroupent;
+ _pwcache_endgrent =3D a_endgrent;
+ _pwcache_getgrnam =3D a_getgrnam;
+ _pwcache_getgrgid =3D a_getgrgid;
+
+ return (0);
+}
+
+
+#ifdef TEST_PWCACHE
+
+struct passwd *
+test_getpwnam(const char *name)
+{
+ static struct passwd foo;
+
+ memset(&foo, 0, sizeof(foo));
+ if (strcmp(name, "toor") =3D=3D 0) {
+ foo.pw_uid =3D 666;
+ return &foo;
+ }
+ return (getpwnam(name));
+}
+
+int
+main(int argc, char *argv[])
+{
+ uid_t u;
+ int r, i;
+
+ printf("pass 1 (default userdb)\n");
+ for (i =3D 1; i < argc; i++) {
+ printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
+ i, pwopn, usrtb_fail, usrtb);
+ r =3D uid_from_user(argv[i], &u);
+ if (r =3D=3D -1)
+ printf(" uid_from_user %s: failed\n", argv[i]);
+ else
+ printf(" uid_from_user %s: %d\n", argv[i], u);
+ }
+ printf("pass 1 finish: pwopn %d usrtb_fail %d usrtb %p\n",
+ pwopn, usrtb_fail, usrtb);
+
+ puts("");
+ printf("pass 2 (replacement userdb)\n");
+ printf("pwcache_userdb returned %d\n",
+ pwcache_userdb(setpassent, test_getpwnam, getpwuid));
+ printf("pwopn %d usrtb_fail %d usrtb %p\n", pwopn, usrtb_fail, usrtb);
+
+ for (i =3D 1; i < argc; i++) {
+ printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
+ i, pwopn, usrtb_fail, usrtb);
+ u =3D -1;
+ r =3D uid_from_user(argv[i], &u);
+ if (r =3D=3D -1)
+ printf(" uid_from_user %s: failed\n", argv[i]);
+ else
+ printf(" uid_from_user %s: %d\n", argv[i], u);
+ }
+ printf("pass 2 finish: pwopn %d usrtb_fail %d usrtb %p\n",
+ pwopn, usrtb_fail, usrtb);
+
+ puts("");
+ printf("pass 3 (null pointers)\n");
+ printf("pwcache_userdb returned %d\n",
+ pwcache_userdb(NULL, NULL, NULL));
+
+ return (0);
+}
+#endif /* TEST_PWCACHE */
+#endif /* !HAVE_PWCACHE_USERDB */
Property changes on: contrib/libc-pwcache/pwcache.c
___________________________________________________________________
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+text/plain
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## -0,0 +1 ##
+native
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Index: contrib/libc-pwcache/pwcache.3
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- contrib/libc-pwcache/pwcache.3 (revision 0)
+++ contrib/libc-pwcache/pwcache.3 (working copy)
@@ -0,0 +1,221 @@
+.\" $NetBSD: pwcache.3,v 1.17 2008/05/02 18:11:04 martin Exp $
+.\" $FreeBSD$
+.\"
+.\" Copyright (c) 1989, 1991, 1993
+.\" The Regents of the University of California. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\" may be used to endorse or promote products derived from this softwa=
re
+.\" without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PUR=
POSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIAB=
LE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUEN=
TIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, ST=
RICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY =
WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"
+.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUT=
ORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LI=
MITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTIC=
ULAR
+.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUT=
ORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINE=
SS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF=
THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\"
+.\" @(#)pwcache.3 8.1 (Berkeley) 6/9/93
+.\"
+.Dd January 24, 2002
+.Dt PWCACHE 3
+.Os
+.Sh NAME
+.Nm pwcache ,
+.Nm user_from_uid ,
+.Nm group_from_gid
+.Nd cache password and group entries
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In pwd.h
+.Ft const char *
+.Fn user_from_uid "uid_t uid" "int nouser"
+.Ft int
+.Fn uid_from_user "const char *name" "uid_t *uid"
+.Ft int
+.Fn pwcache_userdb "int (*setpassent)(int)" "void (*endpwent)(void)" "stru=
ct passwd * (*getpwnam)(const char *)" "struct passwd * (*getpwuid)(uid_t)"
+.In grp.h
+.Ft const char *
+.Fn group_from_gid "gid_t gid" "int nogroup"
+.Ft int
+.Fn gid_from_group "const char *name" "gid_t *gid"
+.Ft int
+.Fn pwcache_groupdb "int (*setgroupent)(int)" "void (*endgrent)(void)" "st=
ruct group * (*getgrnam)(const char *)" "struct group * (*getgrgid)(gid_t)"
+.Sh DESCRIPTION
+The
+.Fn user_from_uid
+function returns the user name associated with the argument
+.Fa uid .
+The user name is cached so that multiple calls with the same
+.Fa uid
+do not require additional calls to
+.Xr getpwuid 3 .
+If there is no user associated with the
+.Fa uid ,
+a pointer is returned
+to a string representation of the
+.Fa uid ,
+unless the argument
+.Fa nouser
+is non-zero, in which case a
+.Dv NULL
+pointer is returned.
+.Pp
+The
+.Fn group_from_gid
+function returns the group name associated with the argument
+.Fa gid .
+The group name is cached so that multiple calls with the same
+.Fa gid
+do not require additional calls to
+.Xr getgrgid 3 .
+If there is no group associated with the
+.Fa gid ,
+a pointer is returned
+to a string representation of the
+.Fa gid ,
+unless the argument
+.Fa nogroup
+is non-zero, in which case a
+.Dv NULL
+pointer is returned.
+.Pp
+The
+.Fn uid_from_user
+function returns the uid associated with the argument
+.Fa name .
+The uid is cached so that multiple calls with the same
+.Fa name
+do not require additional calls to
+.Xr getpwnam 3 .
+If there is no uid associated with the
+.Fa name ,
+the
+.Fn uid_from_user
+function returns \-1; otherwise it stores the uid at the location pointed =
to by
+.Fa uid
+and returns 0.
+.Pp
+The
+.Fn gid_from_group
+function returns the gid associated with the argument
+.Fa name .
+The gid is cached so that multiple calls with the same
+.Fa name
+do not require additional calls to
+.Xr getgrnam 3 .
+If there is no gid associated with the
+.Fa name ,
+the
+.Fn gid_from_group
+function returns \-1; otherwise it stores the gid at the location pointed =
to by
+.Fa gid
+and returns 0.
+.Pp
+The
+.Fn pwcache_userdb
+function changes the user database access routines which
+.Fn user_from_uid
+and
+.Fn uid_from_user
+call to search for users.
+The caches are flushed and the existing
+.Fn endpwent
+method is called before switching to the new routines.
+.Fa getpwnam
+and
+.Fa getpwuid
+must be provided, and
+.Fa setpassent
+and
+.Fa endpwent
+may be
+.Dv NULL
+pointers.
+.Pp
+The
+.Fn pwcache_groupdb
+function changes the group database access routines which
+.Fn group_from_gid
+and
+.Fn gid_from_group
+call to search for groups.
+The caches are flushed and the existing
+.Fn endgrent
+method is called before switching to the new routines.
+.Fa getgrnam
+and
+.Fa getgrgid
+must be provided, and
+.Fa setgroupent
+and
+.Fa endgrent
+may be
+.Dv NULL
+pointers.
+.Sh SEE ALSO
+.Xr getgrgid 3 ,
+.Xr getgrnam 3 ,
+.Xr getpwnam 3 ,
+.Xr getpwuid 3
+.Sh HISTORY
+The
+.Fn user_from_uid
+and
+.Fn group_from_gid
+functions first appeared in
+.Bx 4.4 .
+.Pp
+The
+.Fn uid_from_user
+and
+.Fn gid_from_group
+functions first appeared in
+.Nx 1.4 .
+.Pp
+The
+.Fn pwcache_userdb
+and
+.Fn pwcache_groupdb
+functions first appeared in
+.Nx 1.6 .
Property changes on: contrib/libc-pwcache/pwcache.3
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