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 #if !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) 39 40 static int _gettemp(char *, int *, int, int); 41 42 int 43 mkstemps(char *path, int slen) 44 { 45 int fd; 46 47 return (_gettemp(path, &fd, 0, slen) ? fd : -1); 48 } 49 50 int 51 mkstemp(char *path) 52 { 53 int fd; 54 55 return (_gettemp(path, &fd, 0, 0) ? fd : -1); 56 } 57 58 char * 59 mkdtemp(char *path) 60 { 61 return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL); 62 } 63 64 static int 65 _gettemp(path, doopen, domkdir, slen) 66 char *path; 67 register int *doopen; 68 int domkdir; 69 int slen; 70 { 71 register char *start, *trv, *suffp; 72 struct stat sbuf; 73 int rval; 74 pid_t pid; 75 76 if (doopen && domkdir) { 77 errno = EINVAL; 78 return(0); 79 } 80 81 for (trv = path; *trv; ++trv) 82 ; 83 trv -= slen; 84 suffp = trv; 85 --trv; 86 if (trv < path) { 87 errno = EINVAL; 88 return (0); 89 } 90 pid = getpid(); 91 while (trv >= path && *trv == 'X' && pid != 0) { 92 *trv-- = (pid % 10) + '0'; 93 pid /= 10; 94 } 95 while (trv >= path && *trv == 'X') { 96 char c; 97 98 pid = (arc4random() & 0xffff) % (26+26); 99 if (pid < 26) 100 c = pid + 'A'; 101 else 102 c = (pid - 26) + 'a'; 103 *trv-- = c; 104 } 105 start = trv + 1; 106 107 /* 108 * check the target directory; if you have six X's and it 109 * doesn't exist this runs for a *very* long time. 110 */ 111 if (doopen || domkdir) { 112 for (;; --trv) { 113 if (trv <= path) 114 break; 115 if (*trv == '/') { 116 *trv = '\0'; 117 rval = stat(path, &sbuf); 118 *trv = '/'; 119 if (rval != 0) 120 return(0); 121 if (!S_ISDIR(sbuf.st_mode)) { 122 errno = ENOTDIR; 123 return(0); 124 } 125 break; 126 } 127 } 128 } 129 130 for (;;) { 131 if (doopen) { 132 if ((*doopen = 133 open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 134 return(1); 135 if (errno != EEXIST) 136 return(0); 137 } else if (domkdir) { 138 if (mkdir(path, 0700) == 0) 139 return(1); 140 if (errno != EEXIST) 141 return(0); 142 } else if (lstat(path, &sbuf)) 143 return(errno == ENOENT ? 1 : 0); 144 145 /* tricky little algorithm for backward compatibility */ 146 for (trv = start;;) { 147 if (!*trv) 148 return (0); 149 if (*trv == 'Z') { 150 if (trv == suffp) 151 return (0); 152 *trv++ = 'a'; 153 } else { 154 if (isdigit(*trv)) 155 *trv = 'a'; 156 else if (*trv == 'z') /* inc from z to A */ 157 *trv = 'A'; 158 else { 159 if (trv == suffp) 160 return (0); 161 ++*trv; 162 } 163 break; 164 } 165 } 166 } 167 /*NOTREACHED*/ 168 } 169 170 #endif /* !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) */ 171