/* $OpenBSD: mktemp.c,v 1.24 2008/09/15 20:28:44 chl Exp $ */ /* * Copyright (c) 1987, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <ctype.h> #include <unistd.h> static int _gettemp(char *, int *, int, int); int mkstemps(char *path, int slen) { int fd; return (_gettemp(path, &fd, 0, slen) ? fd : -1); } int mkstemp(char *path) { int fd; return (_gettemp(path, &fd, 0, 0) ? fd : -1); } char * mkdtemp(char *path) { return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL); } char *_mktemp(char *); char * _mktemp(char *path) { return(_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL); } __warn_references(mktemp, "warning: mktemp() possibly used unsafely; consider using mkstemp()"); char * mktemp(char *path) { return(_mktemp(path)); } static int _gettemp(char *path, int *doopen, int domkdir, int slen) { char *start, *cp, *ep; struct stat sbuf; size_t len; int r; if (doopen && domkdir) { errno = EINVAL; return(0); } len = strlen(path); if (len == 0 || slen >= len) { errno = EINVAL; return(0); } ep = path + len - slen; for (start = ep; *--start == 'X';) ; start++; for (;;) { for (cp = start; cp != ep; cp++) { r = arc4random_uniform(26 + 26); if (r < 26) *cp = r + 'A'; else *cp = (r - 26) + 'a'; } if (doopen) { if ((*doopen = open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) return(1); if (errno != EEXIST) return(0); } else if (domkdir) { if (mkdir(path, 0700) == 0) return(1); if (errno != EEXIST) return(0); } else if (lstat(path, &sbuf)) return(errno == ENOENT ? 1 : 0); } /*NOTREACHED*/ }