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 #if 0 36 static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* LIBC_SCCS and not lint */ 41 42 #include <sys/types.h> 43 #include <sys/stat.h> 44 #include <fcntl.h> 45 #include <errno.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <ctype.h> 49 #include <unistd.h> 50 51 char *_mktemp __P((char *)); 52 53 static int _gettemp __P((char *, int *, int, int)); 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 register int *doopen; 102 int domkdir; 103 int slen; 104 { 105 register char *start, *trv, *suffp; 106 struct stat sbuf; 107 int pid, rval; 108 109 if (doopen && domkdir) { 110 errno = EINVAL; 111 return(0); 112 } 113 114 for (trv = path; *trv; ++trv) 115 ; 116 trv -= slen; 117 suffp = trv; 118 --trv; 119 if (trv < path) { 120 errno = EINVAL; 121 return (0); 122 } 123 pid = getpid(); 124 while (*trv == 'X' && pid != 0) { 125 *trv-- = (pid % 10) + '0'; 126 pid /= 10; 127 } 128 while (*trv == 'X') { 129 char c; 130 131 pid = (arc4random() & 0xffff) % (26+26); 132 if (pid < 26) 133 c = pid + 'A'; 134 else 135 c = (pid - 26) + 'a'; 136 *trv-- = c; 137 } 138 start = trv + 1; 139 140 /* 141 * check the target directory; if you have six X's and it 142 * doesn't exist this runs for a *very* long time. 143 */ 144 if (doopen || domkdir) { 145 for (;; --trv) { 146 if (trv <= path) 147 break; 148 if (*trv == '/') { 149 *trv = '\0'; 150 rval = stat(path, &sbuf); 151 *trv = '/'; 152 if (rval != 0) 153 return(0); 154 if (!S_ISDIR(sbuf.st_mode)) { 155 errno = ENOTDIR; 156 return(0); 157 } 158 break; 159 } 160 } 161 } 162 163 for (;;) { 164 if (doopen) { 165 if ((*doopen = 166 _open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 167 return(1); 168 if (errno != EEXIST) 169 return(0); 170 } else if (domkdir) { 171 if (mkdir(path, 0700) == 0) 172 return(1); 173 if (errno != EEXIST) 174 return(0); 175 } else if (lstat(path, &sbuf)) 176 return(errno == ENOENT ? 1 : 0); 177 178 /* tricky little algorithm for backward compatibility */ 179 for (trv = start;;) { 180 if (*trv == '\0' || trv == suffp) 181 return(0); 182 if (*trv == 'Z') 183 *trv++ = 'a'; 184 else { 185 if (isdigit((unsigned char)*trv)) 186 *trv = 'a'; 187 else if (*trv == 'z') /* inc from z to A */ 188 *trv = 'A'; 189 else 190 ++*trv; 191 break; 192 } 193 } 194 } 195 /*NOTREACHED*/ 196 } 197