fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
432 lines
9.5 KiB
C
432 lines
9.5 KiB
C
/*-
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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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