6593597931
Almost all of our stdio is actually OpenBSD, so although this isn't really a core part of stdio (it doesn't touch struct FILE, for example) it probably makes sense for it to come from the same upstream. My actual motivation though is that it's the only FreeBSD file we have compiler warnings from. This patch moves us over to -Werror by default, with only the DNS code having -Wno-error. Change-Id: Id244a5b445cba41b0a1ca30298ca7b1ed177810c
144 lines
3.2 KiB
C
144 lines
3.2 KiB
C
/* $OpenBSD: mktemp.c,v 1.33 2014/05/06 22:55:27 millert Exp $ */
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/*
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* Copyright (c) 1996-1998, 2008 Theo de Raadt
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* Copyright (c) 1997, 2008-2009 Todd C. Miller
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#define MKTEMP_NAME 0
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#define MKTEMP_FILE 1
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#define MKTEMP_DIR 2
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#define TEMPCHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
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#define NUM_CHARS (sizeof(TEMPCHARS) - 1)
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#define MIN_X 6
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#ifndef nitems
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#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
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#endif
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static int
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mktemp_internal(char *path, int slen, int mode)
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{
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char *start, *cp, *ep;
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const char *tempchars = TEMPCHARS;
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unsigned int tries;
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struct stat sb;
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size_t len;
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int fd;
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len = strlen(path);
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if (len < MIN_X || slen < 0 || (size_t)slen > len - MIN_X) {
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errno = EINVAL;
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return(-1);
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}
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ep = path + len - slen;
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for (start = ep; start > path && start[-1] == 'X'; start--)
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;
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if (ep - start < MIN_X) {
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errno = EINVAL;
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return(-1);
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}
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tries = INT_MAX;
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do {
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cp = start;
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do {
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unsigned short rbuf[16];
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unsigned int i;
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/*
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* Avoid lots of arc4random() calls by using
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* a buffer sized for up to 16 Xs at a time.
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*/
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arc4random_buf(rbuf, sizeof(rbuf));
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for (i = 0; i < nitems(rbuf) && cp != ep; i++)
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*cp++ = tempchars[rbuf[i] % NUM_CHARS];
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} while (cp != ep);
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switch (mode) {
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case MKTEMP_NAME:
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if (lstat(path, &sb) != 0)
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return(errno == ENOENT ? 0 : -1);
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break;
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case MKTEMP_FILE:
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fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
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if (fd != -1 || errno != EEXIST)
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return(fd);
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break;
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case MKTEMP_DIR:
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if (mkdir(path, S_IRUSR|S_IWUSR|S_IXUSR) == 0)
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return(0);
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if (errno != EEXIST)
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return(-1);
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break;
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}
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} while (--tries);
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errno = EEXIST;
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return(-1);
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}
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char *_mktemp(char *);
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char *
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_mktemp(char *path)
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{
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if (mktemp_internal(path, 0, MKTEMP_NAME) == -1)
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return(NULL);
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return(path);
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}
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__warn_references(mktemp,
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"warning: mktemp() possibly used unsafely; consider using mkstemp()");
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char *
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mktemp(char *path)
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{
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return(_mktemp(path));
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}
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int
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mkstemp(char *path)
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{
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return(mktemp_internal(path, 0, MKTEMP_FILE));
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}
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int
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mkstemps(char *path, int slen)
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{
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return(mktemp_internal(path, slen, MKTEMP_FILE));
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}
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char *
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mkdtemp(char *path)
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{
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int error;
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error = mktemp_internal(path, 0, MKTEMP_DIR);
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return(error ? NULL : path);
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}
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