1 /* @(#)cache.c 8.1 (Berkeley) 5/31/93 */
2 /* $NetBSD: pwcache.c,v 1.31 2010/03/23 20:28:59 drochner Exp $ */
5 * Copyright (c) 1992 Keith Muller.
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
9 * This code is derived from software contributed to Berkeley by
10 * Keith Muller of the University of California, San Diego.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * Copyright (c) 2002 The NetBSD Foundation, Inc.
39 * All rights reserved.
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
50 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
51 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
52 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
53 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
54 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
55 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
56 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
57 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
58 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
59 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
60 * POSSIBILITY OF SUCH DAMAGE.
63 #if HAVE_NBTOOL_CONFIG_H
64 #include "nbtool_config.h"
66 * XXX Undefine the renames of these functions so that we don't
67 * XXX rename the versions found in the host's <pwd.h> by mistake!
73 #include "namespace.h"
75 #include <sys/types.h>
76 #include <sys/param.h>
86 #if HAVE_NBTOOL_CONFIG_H
87 /* XXX Now, re-apply the renaming that we undid above. */
88 #define group_from_gid __nbcompat_group_from_gid
89 #define user_from_uid __nbcompat_user_from_uid
93 __weak_alias(user_from_uid,_user_from_uid)
94 __weak_alias(group_from_gid,_group_from_gid)
95 __weak_alias(pwcache_groupdb,_pwcache_groupdb)
98 #if !HAVE_PWCACHE_USERDB || HAVE_NBTOOL_CONFIG_H
102 * routines that control user, group, uid and gid caches (for the archive
103 * member print routine).
105 * these routines cache BOTH hits and misses, a major performance improvement
109 * function pointers to various name lookup routines.
110 * these may be changed as necessary.
112 static int (*_pwcache_setgroupent)(int) = setgroupent;
113 static void (*_pwcache_endgrent)(void) = endgrent;
114 static struct group * (*_pwcache_getgrnam)(const char *) = getgrnam;
115 static struct group * (*_pwcache_getgrgid)(gid_t) = getgrgid;
116 static int (*_pwcache_setpassent)(int) = setpassent;
117 static void (*_pwcache_endpwent)(void) = endpwent;
118 static struct passwd * (*_pwcache_getpwnam)(const char *) = getpwnam;
119 static struct passwd * (*_pwcache_getpwuid)(uid_t) = getpwuid;
124 static int pwopn; /* is password file open */
125 static int gropn; /* is group file open */
126 static UIDC **uidtb; /* uid to name cache */
127 static GIDC **gidtb; /* gid to name cache */
128 static UIDC **usrtb; /* user name to uid cache */
129 static GIDC **grptb; /* group name to gid cache */
131 static int uidtb_fail; /* uidtb_start() failed ? */
132 static int gidtb_fail; /* gidtb_start() failed ? */
133 static int usrtb_fail; /* usrtb_start() failed ? */
134 static int grptb_fail; /* grptb_start() failed ? */
137 static u_int st_hash(const char *, size_t, int);
138 static int uidtb_start(void);
139 static int gidtb_start(void);
140 static int usrtb_start(void);
141 static int grptb_start(void);
145 st_hash(const char *name, size_t len, int tabsz)
149 _DIAGASSERT(name != NULL);
153 key = (key << 8) | (key >> 24);
156 return (key % tabsz);
161 * creates an an empty uidtb
163 * 0 if ok, -1 otherwise
173 if ((uidtb = (UIDC **)calloc(UID_SZ, sizeof(UIDC *))) == NULL) {
182 * creates an an empty gidtb
184 * 0 if ok, -1 otherwise
194 if ((gidtb = (GIDC **)calloc(GID_SZ, sizeof(GIDC *))) == NULL) {
203 * creates an an empty usrtb
205 * 0 if ok, -1 otherwise
215 if ((usrtb = (UIDC **)calloc(UNM_SZ, sizeof(UIDC *))) == NULL) {
224 * creates an an empty grptb
226 * 0 if ok, -1 otherwise
236 if ((grptb = (GIDC **)calloc(GNM_SZ, sizeof(GIDC *))) == NULL) {
245 * caches the name (if any) for the uid. If noname clear, we always
246 * return the stored name (if valid or invalid match).
247 * We use a simple hash table.
249 * Pointer to stored name (or a empty string)
252 user_from_uid(uid_t uid, int noname)
257 if ((uidtb == NULL) && (uidtb_start() < 0))
261 * see if we have this uid cached
263 pptr = uidtb + (uid % UID_SZ);
266 if ((ptr != NULL) && (ptr->valid > 0) && (ptr->uid == uid)) {
268 * have an entry for this uid
270 if (!noname || (ptr->valid == VALID))
276 * No entry for this uid, we will add it
279 if (_pwcache_setpassent != NULL)
280 (*_pwcache_setpassent)(1);
285 *pptr = ptr = (UIDC *)malloc(sizeof(UIDC));
287 if ((pw = (*_pwcache_getpwuid)(uid)) == NULL) {
289 * no match for this uid in the local password file
290 * a string that is the uid in numeric format
295 snprintf(ptr->name, UNMLEN, "%lu", (long) uid);
296 ptr->valid = INVALID;
301 * there is an entry for this uid in the password file
304 return (pw->pw_name);
306 strlcpy(ptr->name, pw->pw_name, UNMLEN);
314 * caches the name (if any) for the gid. If noname clear, we always
315 * return the stored name (if valid or invalid match).
316 * We use a simple hash table.
318 * Pointer to stored name (or a empty string)
321 group_from_gid(gid_t gid, int noname)
326 if ((gidtb == NULL) && (gidtb_start() < 0))
330 * see if we have this gid cached
332 pptr = gidtb + (gid % GID_SZ);
335 if ((ptr != NULL) && (ptr->valid > 0) && (ptr->gid == gid)) {
337 * have an entry for this gid
339 if (!noname || (ptr->valid == VALID))
345 * No entry for this gid, we will add it
348 if (_pwcache_setgroupent != NULL)
349 (*_pwcache_setgroupent)(1);
354 *pptr = ptr = (GIDC *)malloc(sizeof(GIDC));
356 if ((gr = (*_pwcache_getgrgid)(gid)) == NULL) {
358 * no match for this gid in the local group file, put in
359 * a string that is the gid in numberic format
364 snprintf(ptr->name, GNMLEN, "%lu", (long) gid);
365 ptr->valid = INVALID;
370 * there is an entry for this group in the group file
373 return (gr->gr_name);
375 strlcpy(ptr->name, gr->gr_name, GNMLEN);
383 * caches the uid for a given user name. We use a simple hash table.
385 * the uid (if any) for a user name, or a -1 if no match can be found
388 uid_from_user(const char *name, uid_t *uid)
395 * return -1 for mangled names
397 if (name == NULL || ((namelen = strlen(name)) == 0))
399 if ((usrtb == NULL) && (usrtb_start() < 0))
403 * look up in hash table, if found and valid return the uid,
404 * if found and invalid, return a -1
406 pptr = usrtb + st_hash(name, namelen, UNM_SZ);
409 if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
410 if (ptr->valid == INVALID)
417 if (_pwcache_setpassent != NULL)
418 (*_pwcache_setpassent)(1);
423 *pptr = ptr = (UIDC *)malloc(sizeof(UIDC));
426 * no match, look it up, if no match store it as an invalid entry,
427 * or store the matching uid
430 if ((pw = (*_pwcache_getpwnam)(name)) == NULL)
435 strlcpy(ptr->name, name, UNMLEN);
436 if ((pw = (*_pwcache_getpwnam)(name)) == NULL) {
437 ptr->valid = INVALID;
441 *uid = ptr->uid = pw->pw_uid;
447 * caches the gid for a given group name. We use a simple hash table.
449 * the gid (if any) for a group name, or a -1 if no match can be found
452 gid_from_group(const char *name, gid_t *gid)
459 * return -1 for mangled names
461 if (name == NULL || ((namelen = strlen(name)) == 0))
463 if ((grptb == NULL) && (grptb_start() < 0))
467 * look up in hash table, if found and valid return the uid,
468 * if found and invalid, return a -1
470 pptr = grptb + st_hash(name, namelen, GID_SZ);
473 if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
474 if (ptr->valid == INVALID)
481 if (_pwcache_setgroupent != NULL)
482 (*_pwcache_setgroupent)(1);
487 *pptr = ptr = (GIDC *)malloc(sizeof(GIDC));
490 * no match, look it up, if no match store it as an invalid entry,
491 * or store the matching gid
494 if ((gr = (*_pwcache_getgrnam)(name)) == NULL)
500 strlcpy(ptr->name, name, GNMLEN);
501 if ((gr = (*_pwcache_getgrnam)(name)) == NULL) {
502 ptr->valid = INVALID;
506 *gid = ptr->gid = gr->gr_gid;
510 #define FLUSHTB(arr, len, fail) \
513 for (i = 0; i < len; i++) \
514 if (arr[i] != NULL) \
519 } while (/* CONSTCOND */0);
523 int (*a_setpassent)(int),
524 void (*a_endpwent)(void),
525 struct passwd * (*a_getpwnam)(const char *),
526 struct passwd * (*a_getpwuid)(uid_t))
530 /* a_setpassent and a_endpwent may be NULL */
531 if (a_getpwnam == NULL || a_getpwuid == NULL)
534 if (_pwcache_endpwent != NULL)
535 (*_pwcache_endpwent)();
536 FLUSHTB(uidtb, UID_SZ, uidtb_fail);
537 FLUSHTB(usrtb, UNM_SZ, usrtb_fail);
539 _pwcache_setpassent = a_setpassent;
540 _pwcache_endpwent = a_endpwent;
541 _pwcache_getpwnam = a_getpwnam;
542 _pwcache_getpwuid = a_getpwuid;
549 int (*a_setgroupent)(int),
550 void (*a_endgrent)(void),
551 struct group * (*a_getgrnam)(const char *),
552 struct group * (*a_getgrgid)(gid_t))
556 /* a_setgroupent and a_endgrent may be NULL */
557 if (a_getgrnam == NULL || a_getgrgid == NULL)
560 if (_pwcache_endgrent != NULL)
561 (*_pwcache_endgrent)();
562 FLUSHTB(gidtb, GID_SZ, gidtb_fail);
563 FLUSHTB(grptb, GNM_SZ, grptb_fail);
565 _pwcache_setgroupent = a_setgroupent;
566 _pwcache_endgrent = a_endgrent;
567 _pwcache_getgrnam = a_getgrnam;
568 _pwcache_getgrgid = a_getgrgid;
577 test_getpwnam(const char *name)
579 static struct passwd foo;
581 memset(&foo, 0, sizeof(foo));
582 if (strcmp(name, "toor") == 0) {
586 return (getpwnam(name));
590 main(int argc, char *argv[])
595 printf("pass 1 (default userdb)\n");
596 for (i = 1; i < argc; i++) {
597 printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
598 i, pwopn, usrtb_fail, usrtb);
599 r = uid_from_user(argv[i], &u);
601 printf(" uid_from_user %s: failed\n", argv[i]);
603 printf(" uid_from_user %s: %d\n", argv[i], u);
605 printf("pass 1 finish: pwopn %d usrtb_fail %d usrtb %p\n",
606 pwopn, usrtb_fail, usrtb);
609 printf("pass 2 (replacement userdb)\n");
610 printf("pwcache_userdb returned %d\n",
611 pwcache_userdb(setpassent, test_getpwnam, getpwuid));
612 printf("pwopn %d usrtb_fail %d usrtb %p\n", pwopn, usrtb_fail, usrtb);
614 for (i = 1; i < argc; i++) {
615 printf("i: %d, pwopn %d usrtb_fail %d usrtb %p\n",
616 i, pwopn, usrtb_fail, usrtb);
618 r = uid_from_user(argv[i], &u);
620 printf(" uid_from_user %s: failed\n", argv[i]);
622 printf(" uid_from_user %s: %d\n", argv[i], u);
624 printf("pass 2 finish: pwopn %d usrtb_fail %d usrtb %p\n",
625 pwopn, usrtb_fail, usrtb);
628 printf("pass 3 (null pointers)\n");
629 printf("pwcache_userdb returned %d\n",
630 pwcache_userdb(NULL, NULL, NULL));
634 #endif /* TEST_PWCACHE */
635 #endif /* !HAVE_PWCACHE_USERDB */