294 lines
7.6 KiB
C
294 lines
7.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* mkdtemp.c
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* create a mode-0700 temporary directory
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*
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* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
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*
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*
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* IDENTIFICATION
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* src/port/mkdtemp.c
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*
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* This code was taken from NetBSD to provide an implementation for platforms
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* that lack it. (Among compatibly-licensed implementations, the OpenBSD
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* version better resists denial-of-service attacks. However, it has a
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* cryptographic dependency.) The NetBSD copyright terms follow.
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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#define _DIAGASSERT(x) do {} while (0)
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/* $NetBSD: gettemp.c,v 1.17 2014/01/21 19:09:48 seanb Exp $ */
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/*
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* Copyright (c) 1987, 1993
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* The Regents of the University of California. All rights reserved.
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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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#if !HAVE_NBTOOL_CONFIG_H || !HAVE_MKSTEMP || !HAVE_MKDTEMP
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#ifdef NOT_POSTGRESQL
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: gettemp.c,v 1.17 2014/01/21 19:09:48 seanb Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#ifdef NOT_POSTGRESQL
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#if HAVE_NBTOOL_CONFIG_H
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#define GETTEMP __nbcompat_gettemp
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#else
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#include "reentrant.h"
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#include "local.h"
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#define GETTEMP __gettemp
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#endif
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#endif
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static int
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GETTEMP(char *path, int *doopen, int domkdir)
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{
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char *start,
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*trv;
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struct stat sbuf;
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u_int pid;
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/*
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* To guarantee multiple calls generate unique names even if the file is
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* not created. 676 different possibilities with 7 or more X's, 26 with 6
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* or less.
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*/
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static char xtra[2] = "aa";
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int xcnt = 0;
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_DIAGASSERT(path != NULL);
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/* doopen may be NULL */
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pid = getpid();
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/* Move to end of path and count trailing X's. */
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for (trv = path; *trv; ++trv)
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if (*trv == 'X')
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xcnt++;
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else
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xcnt = 0;
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/* Use at least one from xtra. Use 2 if more than 6 X's. */
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if (xcnt > 0)
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{
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*--trv = xtra[0];
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xcnt--;
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}
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if (xcnt > 5)
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{
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*--trv = xtra[1];
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xcnt--;
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}
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/* Set remaining X's to pid digits with 0's to the left. */
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for (; xcnt > 0; xcnt--)
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{
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*--trv = (pid % 10) + '0';
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pid /= 10;
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}
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/* update xtra for next call. */
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if (xtra[0] != 'z')
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xtra[0]++;
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else
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{
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xtra[0] = 'a';
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if (xtra[1] != 'z')
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xtra[1]++;
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else
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xtra[1] = 'a';
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}
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/*
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* check the target directory; if you have six X's and it doesn't exist
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* this runs for a *very* long time.
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*/
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for (start = trv + 1;; --trv)
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{
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if (trv <= path)
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break;
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if (*trv == '/')
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{
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int e;
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*trv = '\0';
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e = stat(path, &sbuf);
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*trv = '/';
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if (e == -1)
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return doopen == NULL && !domkdir;
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if (!S_ISDIR(sbuf.st_mode))
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{
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errno = ENOTDIR;
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return doopen == NULL && !domkdir;
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}
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break;
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}
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}
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for (;;)
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{
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if (doopen)
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{
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if ((*doopen =
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open(path, O_CREAT | O_EXCL | O_RDWR, 0600)) >= 0)
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return 1;
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if (errno != EEXIST)
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return 0;
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}
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else if (domkdir)
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{
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if (mkdir(path, 0700) >= 0)
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return 1;
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if (errno != EEXIST)
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return 0;
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}
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else if (lstat(path, &sbuf))
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return errno == ENOENT ? 1 : 0;
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/* tricky little algorithm for backward compatibility */
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for (trv = start;;)
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{
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if (!*trv)
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return 0;
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if (*trv == 'z')
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*trv++ = 'a';
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else
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{
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if (isdigit((unsigned char) *trv))
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*trv = 'a';
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else
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++*trv;
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break;
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}
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}
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}
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/* NOTREACHED */
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}
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#endif /* !HAVE_NBTOOL_CONFIG_H || !HAVE_MKSTEMP ||
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* !HAVE_MKDTEMP */
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/* $NetBSD: mkdtemp.c,v 1.11 2012/03/15 18:22:30 christos Exp $ */
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/*
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* Copyright (c) 1987, 1993
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* The Regents of the University of California. All rights reserved.
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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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#if !HAVE_NBTOOL_CONFIG_H || !HAVE_MKDTEMP
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#ifdef NOT_POSTGRESQL
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: mkdtemp.c,v 1.11 2012/03/15 18:22:30 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#if HAVE_NBTOOL_CONFIG_H
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#define GETTEMP __nbcompat_gettemp
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#else
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "reentrant.h"
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#include "local.h"
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#define GETTEMP __gettemp
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#endif
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#endif
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char *
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mkdtemp(char *path)
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{
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_DIAGASSERT(path != NULL);
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return GETTEMP(path, NULL, 1) ? path : NULL;
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}
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#endif /* !HAVE_NBTOOL_CONFIG_H || !HAVE_MKDTEMP */
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