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 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "namespace.h" 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 #include <fcntl.h> 44 #include <errno.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <ctype.h> 49 #include <unistd.h> 50 #include "un-namespace.h" 51 52 char *_mktemp(char *); 53 54 static int _gettemp(char *, int *, int, int); 55 56 static const unsigned char padchar[] = 57 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 58 59 int 60 mkstemps(path, slen) 61 char *path; 62 int slen; 63 { 64 int fd; 65 66 return (_gettemp(path, &fd, 0, slen) ? fd : -1); 67 } 68 69 int 70 mkstemp(path) 71 char *path; 72 { 73 int fd; 74 75 return (_gettemp(path, &fd, 0, 0) ? fd : -1); 76 } 77 78 char * 79 mkdtemp(path) 80 char *path; 81 { 82 return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL); 83 } 84 85 char * 86 _mktemp(path) 87 char *path; 88 { 89 return (_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL); 90 } 91 92 __warn_references(mktemp, 93 "warning: mktemp() possibly used unsafely; consider using mkstemp()"); 94 95 char * 96 mktemp(path) 97 char *path; 98 { 99 return (_mktemp(path)); 100 } 101 102 static int 103 _gettemp(path, doopen, domkdir, slen) 104 char *path; 105 int *doopen; 106 int domkdir; 107 int slen; 108 { 109 char *start, *trv, *suffp; 110 char *pad; 111 struct stat sbuf; 112 int rval; 113 uint32_t rand; 114 115 if (doopen != NULL && domkdir) { 116 errno = EINVAL; 117 return (0); 118 } 119 120 for (trv = path; *trv != '\0'; ++trv) 121 ; 122 trv -= slen; 123 suffp = trv; 124 --trv; 125 if (trv < path) { 126 errno = EINVAL; 127 return (0); 128 } 129 130 /* Fill space with random characters */ 131 while (trv >= path && *trv == 'X') { 132 rand = arc4random() % (sizeof(padchar) - 1); 133 *trv-- = padchar[rand]; 134 } 135 start = trv + 1; 136 137 /* 138 * check the target directory. 139 */ 140 if (doopen != NULL || domkdir) { 141 for (; trv > path; --trv) { 142 if (*trv == '/') { 143 *trv = '\0'; 144 rval = stat(path, &sbuf); 145 *trv = '/'; 146 if (rval != 0) 147 return (0); 148 if (!S_ISDIR(sbuf.st_mode)) { 149 errno = ENOTDIR; 150 return (0); 151 } 152 break; 153 } 154 } 155 } 156 157 for (;;) { 158 if (doopen) { 159 if ((*doopen = 160 _open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 161 return (1); 162 if (errno != EEXIST) 163 return (0); 164 } else if (domkdir) { 165 if (mkdir(path, 0700) == 0) 166 return (1); 167 if (errno != EEXIST) 168 return (0); 169 } else if (lstat(path, &sbuf)) 170 return (errno == ENOENT); 171 172 /* If we have a collision, cycle through the space of filenames */ 173 for (trv = start;;) { 174 if (*trv == '\0' || trv == suffp) 175 return (0); 176 pad = strchr(padchar, *trv); 177 if (pad == NULL || *++pad == '\0') 178 *trv++ = padchar[0]; 179 else { 180 *trv++ = *pad; 181 break; 182 } 183 } 184 } 185 /*NOTREACHED*/ 186 } 187