minix/lib/libc/gen/pwcache.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

643 lines
15 KiB
C

/* $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 PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS 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.
*/
/*-
* 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 CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* 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[] = "@(#)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 */
#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>
#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 improvement
*/
/*
* function pointers to various name lookup routines.
* these may be changed as necessary.
*/
static int (*_pwcache_setgroupent)(int) = setgroupent;
static void (*_pwcache_endgrent)(void) = endgrent;
static struct group * (*_pwcache_getgrnam)(const char *) = getgrnam;
static struct group * (*_pwcache_getgrgid)(gid_t) = getgrgid;
static int (*_pwcache_setpassent)(int) = setpassent;
static void (*_pwcache_endpwent)(void) = endpwent;
static struct passwd * (*_pwcache_getpwnam)(const char *) = getpwnam;
static struct passwd * (*_pwcache_getpwuid)(uid_t) = 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 = 0;
_DIAGASSERT(name != NULL);
while (len--) {
key += *name++;
key = (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 != NULL)
return (0);
if (uidtb_fail)
return (-1);
if ((uidtb = (UIDC **)calloc(UID_SZ, sizeof(UIDC *))) == 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 != NULL)
return (0);
if (gidtb_fail)
return (-1);
if ((gidtb = (GIDC **)calloc(GID_SZ, sizeof(GIDC *))) == 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 != NULL)
return (0);
if (usrtb_fail)
return (-1);
if ((usrtb = (UIDC **)calloc(UNM_SZ, sizeof(UIDC *))) == 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 != NULL)
return (0);
if (grptb_fail)
return (-1);
if ((grptb = (GIDC **)calloc(GNM_SZ, sizeof(GIDC *))) == 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 == NULL) && (uidtb_start() < 0))
return (NULL);
/*
* see if we have this uid cached
*/
pptr = uidtb + (uid % UID_SZ);
ptr = *pptr;
if ((ptr != NULL) && (ptr->valid > 0) && (ptr->uid == uid)) {
/*
* have an entry for this uid
*/
if (!noname || (ptr->valid == VALID))
return (ptr->name);
return (NULL);
}
/*
* No entry for this uid, we will add it
*/
if (!pwopn) {
if (_pwcache_setpassent != NULL)
(*_pwcache_setpassent)(1);
++pwopn;
}
if (ptr == NULL)
*pptr = ptr = (UIDC *)malloc(sizeof(UIDC));
if ((pw = (*_pwcache_getpwuid)(uid)) == NULL) {
/*
* no match for this uid in the local password file
* a string that is the uid in numeric format
*/
if (ptr == NULL)
return (NULL);
ptr->uid = uid;
(void)snprintf(ptr->name, UNMLEN, "%lu", (long) uid);
ptr->valid = INVALID;
if (noname)
return (NULL);
} else {
/*
* there is an entry for this uid in the password file
*/
if (ptr == NULL)
return (pw->pw_name);
ptr->uid = uid;
(void)strlcpy(ptr->name, pw->pw_name, UNMLEN);
ptr->valid = 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 == NULL) && (gidtb_start() < 0))
return (NULL);
/*
* see if we have this gid cached
*/
pptr = gidtb + (gid % GID_SZ);
ptr = *pptr;
if ((ptr != NULL) && (ptr->valid > 0) && (ptr->gid == gid)) {
/*
* have an entry for this gid
*/
if (!noname || (ptr->valid == VALID))
return (ptr->name);
return (NULL);
}
/*
* No entry for this gid, we will add it
*/
if (!gropn) {
if (_pwcache_setgroupent != NULL)
(*_pwcache_setgroupent)(1);
++gropn;
}
if (ptr == NULL)
*pptr = ptr = (GIDC *)malloc(sizeof(GIDC));
if ((gr = (*_pwcache_getgrgid)(gid)) == NULL) {
/*
* no match for this gid in the local group file, put in
* a string that is the gid in numberic format
*/
if (ptr == NULL)
return (NULL);
ptr->gid = gid;
(void)snprintf(ptr->name, GNMLEN, "%lu", (long) gid);
ptr->valid = INVALID;
if (noname)
return (NULL);
} else {
/*
* there is an entry for this group in the group file
*/
if (ptr == NULL)
return (gr->gr_name);
ptr->gid = gid;
(void)strlcpy(ptr->name, gr->gr_name, GNMLEN);
ptr->valid = 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 == NULL || ((namelen = strlen(name)) == 0))
return (-1);
if ((usrtb == 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 = usrtb + st_hash(name, namelen, UNM_SZ);
ptr = *pptr;
if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
if (ptr->valid == INVALID)
return (-1);
*uid = ptr->uid;
return (0);
}
if (!pwopn) {
if (_pwcache_setpassent != NULL)
(*_pwcache_setpassent)(1);
++pwopn;
}
if (ptr == NULL)
*pptr = ptr = (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 == NULL) {
if ((pw = (*_pwcache_getpwnam)(name)) == NULL)
return (-1);
*uid = pw->pw_uid;
return (0);
}
(void)strlcpy(ptr->name, name, UNMLEN);
if ((pw = (*_pwcache_getpwnam)(name)) == NULL) {
ptr->valid = INVALID;
return (-1);
}
ptr->valid = VALID;
*uid = ptr->uid = 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 == NULL || ((namelen = strlen(name)) == 0))
return (-1);
if ((grptb == 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 = grptb + st_hash(name, namelen, GID_SZ);
ptr = *pptr;
if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
if (ptr->valid == INVALID)
return (-1);
*gid = ptr->gid;
return (0);
}
if (!gropn) {
if (_pwcache_setgroupent != NULL)
(*_pwcache_setgroupent)(1);
++gropn;
}
if (ptr == NULL)
*pptr = ptr = (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 == NULL) {
if ((gr = (*_pwcache_getgrnam)(name)) == NULL)
return (-1);
*gid = gr->gr_gid;
return (0);
}
(void)strlcpy(ptr->name, name, GNMLEN);
if ((gr = (*_pwcache_getgrnam)(name)) == NULL) {
ptr->valid = INVALID;
return (-1);
}
ptr->valid = VALID;
*gid = ptr->gid = gr->gr_gid;
return (0);
}
#define FLUSHTB(arr, len, fail) \
do { \
if (arr != NULL) { \
for (i = 0; i < len; i++) \
if (arr[i] != NULL) \
free(arr[i]); \
arr = NULL; \
} \
fail = 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 == NULL || a_getpwuid == NULL)
return (-1);
if (_pwcache_endpwent != NULL)
(*_pwcache_endpwent)();
FLUSHTB(uidtb, UID_SZ, uidtb_fail);
FLUSHTB(usrtb, UNM_SZ, usrtb_fail);
pwopn = 0;
_pwcache_setpassent = a_setpassent;
_pwcache_endpwent = a_endpwent;
_pwcache_getpwnam = a_getpwnam;
_pwcache_getpwuid = 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 == NULL || a_getgrgid == NULL)
return (-1);
if (_pwcache_endgrent != NULL)
(*_pwcache_endgrent)();
FLUSHTB(gidtb, GID_SZ, gidtb_fail);
FLUSHTB(grptb, GNM_SZ, grptb_fail);
gropn = 0;
_pwcache_setgroupent = a_setgroupent;
_pwcache_endgrent = a_endgrent;
_pwcache_getgrnam = a_getgrnam;
_pwcache_getgrgid = 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") == 0) {
foo.pw_uid = 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 = 1; i < argc; i++) {
printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
i, pwopn, usrtb_fail, usrtb);
r = uid_from_user(argv[i], &u);
if (r == -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 = 1; i < argc; i++) {
printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
i, pwopn, usrtb_fail, usrtb);
u = -1;
r = uid_from_user(argv[i], &u);
if (r == -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 */