1 /* 2 * Copyright (c) 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. 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 * @(#)mktemp.c 8.1 (Berkeley) 6/4/93 34 * $FreeBSD: src/lib/libc/stdio/mktemp.c,v 1.19.2.3 2002/06/18 09:53:07 robert Exp $ 35 * $DragonFly: src/lib/libc/stdio/mktemp.c,v 1.7 2005/11/20 11:07:30 swildner Exp $ 36 */ 37 38 /* #include "namespace.h" */ 39 #include <sys/types.h> 40 #include <sys/stat.h> 41 #include <fcntl.h> 42 #include <errno.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <ctype.h> 47 #include <unistd.h> 48 /* #include "un-namespace.h" */ 49 50 char *_mktemp (char *); 51 52 static int _gettemp (char *, int *, int, int); 53 54 static const unsigned char padchar[] = 55 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 56 57 int 58 mkstemps(char *path, int slen) 59 { 60 int fd; 61 62 return (_gettemp(path, &fd, 0, slen) ? fd : -1); 63 } 64 65 int 66 mkstemp(char *path) 67 { 68 int fd; 69 70 return (_gettemp(path, &fd, 0, 0) ? fd : -1); 71 } 72 73 char * 74 mkdtemp(char *path) 75 { 76 return (_gettemp(path, NULL, 1, 0) ? path : NULL); 77 } 78 79 char * 80 _mktemp(char *path) 81 { 82 return (_gettemp(path, NULL, 0, 0) ? path : NULL); 83 } 84 85 __warn_references(mktemp, 86 "warning: mktemp() possibly used unsafely; consider using mkstemp()"); 87 88 char * 89 mktemp(char *path) 90 { 91 return (_mktemp(path)); 92 } 93 94 static int 95 _gettemp(char *path, int *doopen, int domkdir, int slen) 96 { 97 char *start, *trv, *suffp; 98 char *pad; 99 struct stat sbuf; 100 int rval; 101 uint32_t psrand; 102 103 if (doopen != NULL && domkdir) { 104 errno = EINVAL; 105 return (0); 106 } 107 108 for (trv = path; *trv != '\0'; ++trv) 109 ; 110 trv -= slen; 111 suffp = trv; 112 --trv; 113 if (trv < path) { 114 errno = EINVAL; 115 return (0); 116 } 117 118 /* Fill space with random characters */ 119 while (trv >= path && *trv == 'X') { 120 psrand = arc4random() % (sizeof(padchar) - 1); 121 *trv-- = padchar[psrand]; 122 } 123 start = trv + 1; 124 125 /* 126 * check the target directory. 127 */ 128 if (doopen != NULL || domkdir) { 129 for (; trv > path; --trv) { 130 if (*trv == '/') { 131 *trv = '\0'; 132 rval = stat(path, &sbuf); 133 *trv = '/'; 134 if (rval != 0) 135 return (0); 136 if (!S_ISDIR(sbuf.st_mode)) { 137 errno = ENOTDIR; 138 return (0); 139 } 140 break; 141 } 142 } 143 } 144 145 for (;;) { 146 if (doopen) { 147 if ((*doopen = 148 _open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 149 return (1); 150 if (errno != EEXIST) 151 return (0); 152 } else if (domkdir) { 153 if (mkdir(path, 0700) == 0) 154 return (1); 155 if (errno != EEXIST) 156 return (0); 157 } else if (lstat(path, &sbuf)) 158 return (errno == ENOENT); 159 160 /* If we have a collision, cycle through the space of filenames */ 161 for (trv = start;;) { 162 if (*trv == '\0' || trv == suffp) 163 return (0); 164 pad = strchr(padchar, *trv); 165 if (pad == NULL || *++pad == '\0') 166 *trv++ = padchar[0]; 167 else { 168 *trv++ = *pad; 169 break; 170 } 171 } 172 } 173 /*NOTREACHED*/ 174 } 175