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