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 #ifdef UNSAFE_WARN 89 __warn_references(mktemp, 90 "warning: mktemp() possibly used unsafely; consider using mkstemp()"); 91 #endif 92 93 char * 94 mktemp(path) 95 char *path; 96 { 97 return(_mktemp(path)); 98 } 99 100 static int 101 _gettemp(path, doopen, domkdir, slen) 102 char *path; 103 register int *doopen; 104 int domkdir; 105 int slen; 106 { 107 register char *start, *trv, *suffp; 108 struct stat sbuf; 109 int pid, rval; 110 111 if (doopen && domkdir) { 112 errno = EINVAL; 113 return(0); 114 } 115 116 pid = getpid(); 117 for (trv = path; *trv; ++trv) 118 ; 119 trv -= slen; 120 suffp = trv; 121 --trv; 122 if (trv < path) { 123 errno = EINVAL; 124 return (0); 125 } 126 while (*trv == 'X' && pid != 0) { 127 *trv-- = (pid % 10) + '0'; 128 pid /= 10; 129 } 130 while (*trv == 'X') { 131 char c; 132 133 pid = (arc4random() & 0xffff) % (26+26); 134 if (pid < 26) 135 c = pid + 'A'; 136 else 137 c = (pid - 26) + 'a'; 138 *trv-- = c; 139 } 140 start = trv + 1; 141 142 /* 143 * check the target directory; if you have six X's and it 144 * doesn't exist this runs for a *very* long time. 145 */ 146 if (doopen || domkdir) { 147 for (;; --trv) { 148 if (trv <= path) 149 break; 150 if (*trv == '/') { 151 *trv = '\0'; 152 rval = stat(path, &sbuf); 153 *trv = '/'; 154 if (rval != 0) 155 return(0); 156 if (!S_ISDIR(sbuf.st_mode)) { 157 errno = ENOTDIR; 158 return(0); 159 } 160 break; 161 } 162 } 163 } 164 165 for (;;) { 166 if (doopen) { 167 if ((*doopen = 168 open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 169 return(1); 170 if (errno != EEXIST) 171 return(0); 172 } else if (domkdir) { 173 if (mkdir(path, 0700) == 0) 174 return(1); 175 if (errno != EEXIST) 176 return(0); 177 } else if (lstat(path, &sbuf)) 178 return(errno == ENOENT ? 1 : 0); 179 180 /* tricky little algorithm for backward compatibility */ 181 for (trv = start;;) { 182 if (!*trv) 183 return(0); 184 if (*trv == 'Z') 185 *trv++ = 'a'; 186 else { 187 if (isdigit(*trv)) 188 *trv = 'a'; 189 else if (*trv == 'z') /* inc from z to A */ 190 *trv = 'A'; 191 else 192 ++*trv; 193 break; 194 } 195 } 196 } 197 /*NOTREACHED*/ 198 } 199