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Diffstat (limited to 'pkgtools/libnbcompat/files/pwcache.c')
| -rw-r--r-- | pkgtools/libnbcompat/files/pwcache.c | 677 |
1 files changed, 677 insertions, 0 deletions
diff --git a/pkgtools/libnbcompat/files/pwcache.c b/pkgtools/libnbcompat/files/pwcache.c new file mode 100644 index 00000000000..1ec29699d9c --- /dev/null +++ b/pkgtools/libnbcompat/files/pwcache.c @@ -0,0 +1,677 @@ +/* $NetBSD: pwcache.c,v 1.1.1.1 2003/03/31 05:02:58 grant 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation 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 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. + */ + +#include "config.h" + +#ifdef HAVE_SYS_CDEFS_H +#include <sys/cdefs.h> +#endif + +#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 1.1.1.1 2003/03/31 05:02:58 grant Exp $"); +#endif +#endif /* LIBC_SCCS and not lint */ + +#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> + +#ifndef __ELF__ +#define _user_from_uid user_from_uid +#define _group_from_gid group_from_gid +#define _pwcache_userdb pwcache_userdb +#define _pwcache_groupdb pwcache_groupdb +#else +#ifdef __weak_alias +__weak_alias(user_from_uid,_user_from_uid) +__weak_alias(group_from_gid,_group_from_gid) +__weak_alias(pwcache_userdb,_pwcache_userdb) +__weak_alias(pwcache_groupdb,_pwcache_groupdb) +#endif +#endif + +#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) = +#ifdef HAVE_SETGROUPENT + setgroupent; +#elif HAVE_SETGRENT + setgrent; +#else + NULL +#endif +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) = +#ifdef HAVE_SETPASSENT + setpassent; +#elif HAVE_SETGRENT + setpwent; +#else + NULL +#endif +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); + +#ifndef _DIAGASSERT +#define _DIAGASSERT(cond) assert(cond) +#endif + + +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 the stored name (if valid or invalid match). + * We use a simple hash table. + * Return + * Pointer to stored name (or a empty string) + */ +#ifndef HAVE_USER_FROM_UID +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 numberic 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); +} +#endif + +/* + * group_from_gid() + * caches the name (if any) for the gid. If noname clear, we always + * return the the stored name (if valid or invalid match). + * We use a simple hash table. + * Return + * Pointer to stored name (or a empty string) + */ +#ifndef HAVE_GROUP_FROM_GID +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); +} +#endif + +/* + * 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 + */ +#ifndef HAVE_UID_FROM_USER +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); +} +#endif + +/* + * 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 + */ +#ifndef HAVE_GID_FROM_GROUP +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); +} +#endif + +#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); + +#ifndef HAVE_PWCACHE_USERDB +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); +} +#endif + +#ifndef HAVE_PWCACHE_GROUPDB +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); +} +#endif + + +#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 */ |