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      1 /* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */
      2 /* Changes: Removed mktemp */
      3 
      4 /*	$OpenBSD: mktemp.c,v 1.19 2005/08/08 08:05:36 espie Exp $ */
      5 /*
      6  * Copyright (c) 1987, 1993
      7  *	The Regents of the University of California.  All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 /* OPENBSD ORIGINAL: lib/libc/stdio/mktemp.c */
     35 
     36 #include "includes.h"
     37 
     38 #include <sys/types.h>
     39 #include <sys/stat.h>
     40 
     41 #include <fcntl.h>
     42 #include <ctype.h>
     43 #include <errno.h>
     44 #include <unistd.h>
     45 
     46 #if !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP)
     47 
     48 static int _gettemp(char *, int *, int, int);
     49 
     50 int
     51 mkstemps(char *path, int slen)
     52 {
     53 	int fd;
     54 
     55 	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
     56 }
     57 
     58 int
     59 mkstemp(char *path)
     60 {
     61 	int fd;
     62 
     63 	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
     64 }
     65 
     66 char *
     67 mkdtemp(char *path)
     68 {
     69 	return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
     70 }
     71 
     72 static int
     73 _gettemp(path, doopen, domkdir, slen)
     74 	char *path;
     75 	register int *doopen;
     76 	int domkdir;
     77 	int slen;
     78 {
     79 	register char *start, *trv, *suffp;
     80 	struct stat sbuf;
     81 	int rval;
     82 	pid_t pid;
     83 
     84 	if (doopen && domkdir) {
     85 		errno = EINVAL;
     86 		return(0);
     87 	}
     88 
     89 	for (trv = path; *trv; ++trv)
     90 		;
     91 	trv -= slen;
     92 	suffp = trv;
     93 	--trv;
     94 	if (trv < path) {
     95 		errno = EINVAL;
     96 		return (0);
     97 	}
     98 	pid = getpid();
     99 	while (trv >= path && *trv == 'X' && pid != 0) {
    100 		*trv-- = (pid % 10) + '0';
    101 		pid /= 10;
    102 	}
    103 	while (trv >= path && *trv == 'X') {
    104 		char c;
    105 
    106 		pid = (arc4random() & 0xffff) % (26+26);
    107 		if (pid < 26)
    108 			c = pid + 'A';
    109 		else
    110 			c = (pid - 26) + 'a';
    111 		*trv-- = c;
    112 	}
    113 	start = trv + 1;
    114 
    115 	/*
    116 	 * check the target directory; if you have six X's and it
    117 	 * doesn't exist this runs for a *very* long time.
    118 	 */
    119 	if (doopen || domkdir) {
    120 		for (;; --trv) {
    121 			if (trv <= path)
    122 				break;
    123 			if (*trv == '/') {
    124 				*trv = '\0';
    125 				rval = stat(path, &sbuf);
    126 				*trv = '/';
    127 				if (rval != 0)
    128 					return(0);
    129 				if (!S_ISDIR(sbuf.st_mode)) {
    130 					errno = ENOTDIR;
    131 					return(0);
    132 				}
    133 				break;
    134 			}
    135 		}
    136 	}
    137 
    138 	for (;;) {
    139 		if (doopen) {
    140 			if ((*doopen =
    141 			    open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
    142 				return(1);
    143 			if (errno != EEXIST)
    144 				return(0);
    145 		} else if (domkdir) {
    146 			if (mkdir(path, 0700) == 0)
    147 				return(1);
    148 			if (errno != EEXIST)
    149 				return(0);
    150 		} else if (lstat(path, &sbuf))
    151 			return(errno == ENOENT ? 1 : 0);
    152 
    153 		/* tricky little algorithm for backward compatibility */
    154 		for (trv = start;;) {
    155 			if (!*trv)
    156 				return (0);
    157 			if (*trv == 'Z') {
    158 				if (trv == suffp)
    159 					return (0);
    160 				*trv++ = 'a';
    161 			} else {
    162 				if (isdigit(*trv))
    163 					*trv = 'a';
    164 				else if (*trv == 'z')	/* inc from z to A */
    165 					*trv = 'A';
    166 				else {
    167 					if (trv == suffp)
    168 						return (0);
    169 					++*trv;
    170 				}
    171 				break;
    172 			}
    173 		}
    174 	}
    175 	/*NOTREACHED*/
    176 }
    177 
    178 #endif /* !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) */
    179