1 /* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */
   2 /* Changes: Removed mktemp */
   3 
   4 /*
   5  * Copyright (c) 1987, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36 
  37 #include "includes.h"
  38 
  39 #ifndef HAVE_MKDTEMP
  40 
  41 #if defined(LIBC_SCCS) && !defined(lint)
  42 static char rcsid[] = "$OpenBSD: mktemp.c,v 1.16 2002/05/27 18:20:45 millert Exp $";
  43 #endif /* LIBC_SCCS and not lint */
  44 
  45 #ifdef HAVE_CYGWIN
  46 #define open binary_open
  47 extern int binary_open();
  48 #endif
  49 
  50 static int _gettemp(char *, int *, int, int);
  51 
  52 int
  53 mkstemps(path, slen)
  54         char *path;
  55         int slen;
  56 {
  57         int fd;
  58 
  59         return (_gettemp(path, &fd, 0, slen) ? fd : -1);
  60 }
  61 
  62 int
  63 mkstemp(path)
  64         char *path;
  65 {
  66         int fd;
  67 
  68         return (_gettemp(path, &fd, 0, 0) ? fd : -1);
  69 }
  70 
  71 char *
  72 mkdtemp(path)
  73         char *path;
  74 {
  75         return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
  76 }
  77 
  78 static int
  79 _gettemp(path, doopen, domkdir, slen)
  80         char *path;
  81         register int *doopen;
  82         int domkdir;
  83         int slen;
  84 {
  85         register char *start, *trv, *suffp;
  86         struct stat sbuf;
  87         int rval;
  88         pid_t pid;
  89 
  90         if (doopen && domkdir) {
  91                 errno = EINVAL;
  92                 return(0);
  93         }
  94 
  95         for (trv = path; *trv; ++trv)
  96                 ;
  97         trv -= slen;
  98         suffp = trv;
  99         --trv;
 100         if (trv < path) {
 101                 errno = EINVAL;
 102                 return (0);
 103         }
 104         pid = getpid();
 105         while (trv >= path && *trv == 'X' && pid != 0) {
 106                 *trv-- = (pid % 10) + '0';
 107                 pid /= 10;
 108         }
 109         while (trv >= path && *trv == 'X') {
 110                 char c;
 111 
 112                 pid = (arc4random() & 0xffff) % (26+26);
 113                 if (pid < 26)
 114                         c = pid + 'A';
 115                 else
 116                         c = (pid - 26) + 'a';
 117                 *trv-- = c;
 118         }
 119         start = trv + 1;
 120 
 121         /*
 122          * check the target directory; if you have six X's and it
 123          * doesn't exist this runs for a *very* long time.
 124          */
 125         if (doopen || domkdir) {
 126                 for (;; --trv) {
 127                         if (trv <= path)
 128                                 break;
 129                         if (*trv == '/') {
 130                                 *trv = '\0';
 131                                 rval = stat(path, &sbuf);
 132                                 *trv = '/';
 133                                 if (rval != 0)
 134                                         return(0);
 135                                 if (!S_ISDIR(sbuf.st_mode)) {
 136                                         errno = ENOTDIR;
 137                                         return(0);
 138                                 }
 139                                 break;
 140                         }
 141                 }
 142         }
 143 
 144         for (;;) {
 145                 if (doopen) {
 146                         if ((*doopen =
 147                             open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
 148                                 return(1);
 149                         if (errno != EEXIST)
 150                                 return(0);
 151                 } else if (domkdir) {
 152                         if (mkdir(path, 0700) == 0)
 153                                 return(1);
 154                         if (errno != EEXIST)
 155                                 return(0);
 156                 } else if (lstat(path, &sbuf))
 157                         return(errno == ENOENT ? 1 : 0);
 158 
 159                 /* tricky little algorithm for backward compatibility */
 160                 for (trv = start;;) {
 161                         if (!*trv)
 162                                 return (0);
 163                         if (*trv == 'Z') {
 164                                 if (trv == suffp)
 165                                         return (0);
 166                                 *trv++ = 'a';
 167                         } else {
 168                                 if (isdigit(*trv))
 169                                         *trv = 'a';
 170                                 else if (*trv == 'z')   /* inc from z to A */
 171                                         *trv = 'A';
 172                                 else {
 173                                         if (trv == suffp)
 174                                                 return (0);
 175                                         ++*trv;
 176                                 }
 177                                 break;
 178                         }
 179                 }
 180         }
 181         /*NOTREACHED*/
 182 }
 183 
 184 #endif /* !HAVE_MKDTEMP */
 185 
 186 #pragma ident   "%Z%%M% %I%     %E% SMI"