165 lines
3.5 KiB
C
165 lines
3.5 KiB
C
/* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */
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/* Changes: Removed mktemp */
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/* $OpenBSD: mktemp.c,v 1.30 2010/03/21 23:09:30 schwarze 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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/* OPENBSD ORIGINAL: lib/libc/stdio/mktemp.c */
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#include "includes.h"
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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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#ifdef mkstemp
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#undef mkstemp
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#endif
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int mkstemp(char *);
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/*
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* From glibc man page: 'In glibc versions 2.06 and earlier, the file is
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* created with permissions 0666, that is, read and write for all users.'
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* Provide a wrapper to make sure the mask is reasonable (POSIX requires
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* mode 0600, so mask off any other bits).
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*/
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int
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_ssh_mkstemp(char *template)
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{
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mode_t mask;
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int ret;
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mask = umask(0177);
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ret = mkstemp(template);
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(void)umask(mask);
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return ret;
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}
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#if !defined(HAVE_MKDTEMP)
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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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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 r, 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 == 0 || slen < 0 || (size_t)slen >= len) {
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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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tries = 1;
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for (start = ep; start > path && start[-1] == 'X'; start--) {
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if (tries < INT_MAX / NUM_CHARS)
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tries *= NUM_CHARS;
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}
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tries *= 2;
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do {
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for (cp = start; cp != ep; cp++) {
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r = arc4random_uniform(NUM_CHARS);
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*cp = tempchars[r];
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}
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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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#if 0
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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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#endif
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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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#endif /* !defined(HAVE_MKDTEMP) */
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