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434 lines
9.6 KiB
C
434 lines
9.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1992 Keith Muller.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)cache.c 8.1 (Berkeley) 5/31/93";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <stdio.h>
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#include <pwd.h>
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#include <grp.h>
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#include <stdlib.h>
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#include "pax.h"
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#include "cache.h"
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#include "extern.h"
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/*
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* routines that control user, group, uid and gid caches (for the archive
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* member print routine).
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* IMPORTANT:
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* these routines cache BOTH hits and misses, a major performance improvement
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*/
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static int pwopn = 0; /* is password file open */
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static int gropn = 0; /* is group file open */
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static UIDC **uidtb = NULL; /* uid to name cache */
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static GIDC **gidtb = NULL; /* gid to name cache */
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static UIDC **usrtb = NULL; /* user name to uid cache */
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static GIDC **grptb = NULL; /* group name to gid cache */
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/*
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* uidtb_start
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* creates an an empty uidtb
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* Return:
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* 0 if ok, -1 otherwise
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*/
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int
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uidtb_start(void)
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{
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static int fail = 0;
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if (uidtb != NULL)
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return(0);
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if (fail)
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return(-1);
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if ((uidtb = (UIDC **)calloc(UID_SZ, sizeof(UIDC *))) == NULL) {
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++fail;
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paxwarn(1, "Unable to allocate memory for user id cache table");
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return(-1);
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}
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return(0);
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}
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/*
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* gidtb_start
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* creates an an empty gidtb
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* Return:
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* 0 if ok, -1 otherwise
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*/
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int
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gidtb_start(void)
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{
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static int fail = 0;
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if (gidtb != NULL)
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return(0);
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if (fail)
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return(-1);
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if ((gidtb = (GIDC **)calloc(GID_SZ, sizeof(GIDC *))) == NULL) {
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++fail;
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paxwarn(1, "Unable to allocate memory for group id cache table");
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return(-1);
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}
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return(0);
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}
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/*
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* usrtb_start
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* creates an an empty usrtb
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* Return:
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* 0 if ok, -1 otherwise
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*/
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int
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usrtb_start(void)
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{
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static int fail = 0;
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if (usrtb != NULL)
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return(0);
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if (fail)
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return(-1);
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if ((usrtb = (UIDC **)calloc(UNM_SZ, sizeof(UIDC *))) == NULL) {
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++fail;
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paxwarn(1, "Unable to allocate memory for user name cache table");
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return(-1);
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}
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return(0);
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}
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/*
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* grptb_start
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* creates an an empty grptb
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* Return:
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* 0 if ok, -1 otherwise
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*/
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int
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grptb_start(void)
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{
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static int fail = 0;
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if (grptb != NULL)
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return(0);
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if (fail)
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return(-1);
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if ((grptb = (GIDC **)calloc(GNM_SZ, sizeof(GIDC *))) == NULL) {
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++fail;
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paxwarn(1,"Unable to allocate memory for group name cache table");
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return(-1);
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}
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return(0);
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}
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/*
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* name_uid()
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* caches the name (if any) for the uid. If frc set, we always return the
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* the stored name (if valid or invalid match). We use a simple hash table.
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* Return
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* Pointer to stored name (or an empty string).
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*/
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const char *
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name_uid(uid_t uid, int frc)
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{
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struct passwd *pw;
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UIDC *ptr;
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if ((uidtb == NULL) && (uidtb_start() < 0))
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return("");
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/*
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* see if we have this uid cached
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*/
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ptr = uidtb[uid % UID_SZ];
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if ((ptr != NULL) && (ptr->valid > 0) && (ptr->uid == uid)) {
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/*
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* have an entry for this uid
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*/
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if (frc || (ptr->valid == VALID))
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return(ptr->name);
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return("");
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}
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/*
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* No entry for this uid, we will add it
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*/
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if (!pwopn) {
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setpassent(1);
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++pwopn;
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}
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if (ptr == NULL)
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ptr = uidtb[uid % UID_SZ] = (UIDC *)malloc(sizeof(UIDC));
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if ((pw = getpwuid(uid)) == NULL) {
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/*
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* no match for this uid in the local password file
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* a string that is the uid in numeric format
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*/
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if (ptr == NULL)
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return("");
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ptr->uid = uid;
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ptr->valid = INVALID;
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# ifdef NET2_STAT
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(void)snprintf(ptr->name, sizeof(ptr->name), "%u", uid);
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# else
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(void)snprintf(ptr->name, sizeof(ptr->name), "%lu",
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(unsigned long)uid);
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# endif
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if (frc == 0)
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return("");
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} else {
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/*
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* there is an entry for this uid in the password file
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*/
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if (ptr == NULL)
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return(pw->pw_name);
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ptr->uid = uid;
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(void)strncpy(ptr->name, pw->pw_name, UNMLEN - 1);
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ptr->name[UNMLEN-1] = '\0';
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ptr->valid = VALID;
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}
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return(ptr->name);
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}
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/*
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* name_gid()
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* caches the name (if any) for the gid. If frc set, we always return the
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* the stored name (if valid or invalid match). We use a simple hash table.
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* Return
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* Pointer to stored name (or an empty string).
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*/
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const char *
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name_gid(gid_t gid, int frc)
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{
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struct group *gr;
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GIDC *ptr;
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if ((gidtb == NULL) && (gidtb_start() < 0))
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return("");
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/*
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* see if we have this gid cached
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*/
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ptr = gidtb[gid % GID_SZ];
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if ((ptr != NULL) && (ptr->valid > 0) && (ptr->gid == gid)) {
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/*
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* have an entry for this gid
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*/
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if (frc || (ptr->valid == VALID))
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return(ptr->name);
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return("");
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}
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/*
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* No entry for this gid, we will add it
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*/
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if (!gropn) {
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setgroupent(1);
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++gropn;
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}
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if (ptr == NULL)
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ptr = gidtb[gid % GID_SZ] = (GIDC *)malloc(sizeof(GIDC));
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if ((gr = getgrgid(gid)) == NULL) {
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/*
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* no match for this gid in the local group file, put in
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* a string that is the gid in numeric format
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*/
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if (ptr == NULL)
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return("");
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ptr->gid = gid;
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ptr->valid = INVALID;
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# ifdef NET2_STAT
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(void)snprintf(ptr->name, sizeof(ptr->name), "%u", gid);
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# else
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(void)snprintf(ptr->name, sizeof(ptr->name), "%lu",
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(unsigned long)gid);
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# endif
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if (frc == 0)
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return("");
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} else {
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/*
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* there is an entry for this group in the group file
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*/
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if (ptr == NULL)
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return(gr->gr_name);
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ptr->gid = gid;
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(void)strncpy(ptr->name, gr->gr_name, GNMLEN - 1);
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ptr->name[GNMLEN-1] = '\0';
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ptr->valid = VALID;
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}
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return(ptr->name);
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}
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/*
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* uid_name()
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* caches the uid for a given user name. We use a simple hash table.
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* Return
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* the uid (if any) for a user name, or a -1 if no match can be found
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*/
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int
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uid_name(char *name, uid_t *uid)
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{
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struct passwd *pw;
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UIDC *ptr;
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int namelen;
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/*
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* return -1 for mangled names
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*/
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if (((namelen = strlen(name)) == 0) || (name[0] == '\0'))
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return(-1);
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if ((usrtb == NULL) && (usrtb_start() < 0))
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return(-1);
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/*
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* look up in hash table, if found and valid return the uid,
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* if found and invalid, return a -1
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*/
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ptr = usrtb[st_hash(name, namelen, UNM_SZ)];
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if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
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if (ptr->valid == INVALID)
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return(-1);
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*uid = ptr->uid;
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return(0);
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}
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if (!pwopn) {
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setpassent(1);
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++pwopn;
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}
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if (ptr == NULL)
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ptr = usrtb[st_hash(name, namelen, UNM_SZ)] =
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(UIDC *)malloc(sizeof(UIDC));
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/*
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* no match, look it up, if no match store it as an invalid entry,
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* or store the matching uid
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*/
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if (ptr == NULL) {
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if ((pw = getpwnam(name)) == NULL)
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return(-1);
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*uid = pw->pw_uid;
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return(0);
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}
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(void)strncpy(ptr->name, name, UNMLEN - 1);
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ptr->name[UNMLEN-1] = '\0';
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if ((pw = getpwnam(name)) == NULL) {
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ptr->valid = INVALID;
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return(-1);
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}
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ptr->valid = VALID;
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*uid = ptr->uid = pw->pw_uid;
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return(0);
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}
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/*
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* gid_name()
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* caches the gid for a given group name. We use a simple hash table.
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* Return
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* the gid (if any) for a group name, or a -1 if no match can be found
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*/
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int
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gid_name(char *name, gid_t *gid)
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{
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struct group *gr;
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GIDC *ptr;
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int namelen;
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/*
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* return -1 for mangled names
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*/
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if (((namelen = strlen(name)) == 0) || (name[0] == '\0'))
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return(-1);
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if ((grptb == NULL) && (grptb_start() < 0))
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return(-1);
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/*
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* look up in hash table, if found and valid return the uid,
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* if found and invalid, return a -1
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*/
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ptr = grptb[st_hash(name, namelen, GID_SZ)];
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if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
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if (ptr->valid == INVALID)
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return(-1);
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*gid = ptr->gid;
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return(0);
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}
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if (!gropn) {
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setgroupent(1);
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++gropn;
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}
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if (ptr == NULL)
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ptr = grptb[st_hash(name, namelen, GID_SZ)] =
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(GIDC *)malloc(sizeof(GIDC));
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/*
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* no match, look it up, if no match store it as an invalid entry,
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* or store the matching gid
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*/
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if (ptr == NULL) {
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if ((gr = getgrnam(name)) == NULL)
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return(-1);
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*gid = gr->gr_gid;
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return(0);
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}
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(void)strncpy(ptr->name, name, GNMLEN - 1);
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ptr->name[GNMLEN-1] = '\0';
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if ((gr = getgrnam(name)) == NULL) {
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ptr->valid = INVALID;
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return(-1);
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}
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ptr->valid = VALID;
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*gid = ptr->gid = gr->gr_gid;
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return(0);
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}
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