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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "namespace.h" 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <fcntl.h> 40 #include <errno.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <ctype.h> 45 #include <unistd.h> 46 #include "un-namespace.h" 47 48 char *_mktemp(char *); 49 50 static int _gettemp(char *, int *, int, int); 51 52 static const unsigned char padchar[] = 53 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 54 55 int 56 mkstemps(path, slen) 57 char *path; 58 int slen; 59 { 60 int fd; 61 62 return (_gettemp(path, &fd, 0, slen) ? fd : -1); 63 } 64 65 int 66 mkstemp(path) 67 char *path; 68 { 69 int fd; 70 71 return (_gettemp(path, &fd, 0, 0) ? fd : -1); 72 } 73 74 char * 75 mkdtemp(path) 76 char *path; 77 { 78 return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL); 79 } 80 81 char * 82 _mktemp(path) 83 char *path; 84 { 85 return (_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL); 86 } 87 88 __warn_references(mktemp, 89 "warning: mktemp() possibly used unsafely; consider using mkstemp()"); 90 91 char * 92 mktemp(path) 93 char *path; 94 { 95 return (_mktemp(path)); 96 } 97 98 static int 99 _gettemp(path, doopen, domkdir, slen) 100 char *path; 101 int *doopen; 102 int domkdir; 103 int slen; 104 { 105 char *start, *trv, *suffp; 106 char *pad; 107 struct stat sbuf; 108 int rval; 109 uint32_t rand; 110 111 if (doopen != NULL && domkdir) { 112 errno = EINVAL; 113 return (0); 114 } 115 116 for (trv = path; *trv != '\0'; ++trv) 117 ; 118 trv -= slen; 119 suffp = trv; 120 --trv; 121 if (trv < path) { 122 errno = EINVAL; 123 return (0); 124 } 125 126 /* Fill space with random characters */ 127 while (trv >= path && *trv == 'X') { 128 rand = arc4random() % (sizeof(padchar) - 1); 129 *trv-- = padchar[rand]; 130 } 131 start = trv + 1; 132 133 /* 134 * check the target directory. 135 */ 136 if (doopen != NULL || domkdir) { 137 for (; trv > path; --trv) { 138 if (*trv == '/') { 139 *trv = '\0'; 140 rval = stat(path, &sbuf); 141 *trv = '/'; 142 if (rval != 0) 143 return (0); 144 if (!S_ISDIR(sbuf.st_mode)) { 145 errno = ENOTDIR; 146 return (0); 147 } 148 break; 149 } 150 } 151 } 152 153 for (;;) { 154 if (doopen) { 155 if ((*doopen = 156 _open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 157 return (1); 158 if (errno != EEXIST) 159 return (0); 160 } else if (domkdir) { 161 if (mkdir(path, 0700) == 0) 162 return (1); 163 if (errno != EEXIST) 164 return (0); 165 } else if (lstat(path, &sbuf)) 166 return (errno == ENOENT); 167 168 /* If we have a collision, cycle through the space of filenames */ 169 for (trv = start;;) { 170 if (*trv == '\0' || trv == suffp) 171 return (0); 172 pad = strchr(padchar, *trv); 173 if (pad == NULL || *++pad == '\0') 174 *trv++ = padchar[0]; 175 else { 176 *trv++ = *pad; 177 break; 178 } 179 } 180 } 181 /*NOTREACHED*/ 182 } 183