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 #include <sys/types.h> 35 #include <sys/stat.h> 36 #include <sys/time.h> 37 #include <fcntl.h> 38 #include <errno.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <ctype.h> 43 #include <unistd.h> 44 #include <stdint.h> 45 46 #include <errno_private.h> 47 48 49 static int _gettemp(char *, int *, int, int); 50 51 static const char padchar[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 52 53 54 int 55 mkstemps(char *path, int slen) 56 { 57 int fd; 58 return _gettemp(path, &fd, 0, slen) ? fd : -1; 59 } 60 61 62 int 63 mkstemp(char *path) 64 { 65 int fd; 66 if (_gettemp(path, &fd, 0, 0)) 67 return fd; 68 69 return -1; 70 } 71 72 73 char * 74 mkdtemp(path) 75 char *path; 76 { 77 return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL); 78 } 79 80 81 char * 82 mktemp(char *path) 83 { 84 if (_gettemp(path, (int *)NULL, 0, 0)) 85 return path; 86 87 return NULL; 88 } 89 90 91 static int 92 _gettemp(char *path, int *doopen, int domkdir, int slen) 93 { 94 char *start, *trv, *suffp; 95 char *pad; 96 struct stat sbuf; 97 int rval; 98 static unsigned int seed = 0; 99 100 if (doopen != NULL && domkdir) { 101 __set_errno(EINVAL); 102 return 0; 103 } 104 105 for (trv = path; *trv != '\0'; ++trv) 106 ; 107 108 trv -= slen; 109 suffp = trv; 110 --trv; 111 if (trv < path) { 112 __set_errno(EINVAL); 113 return 0; 114 } 115 116 /* Fill space with random characters */ 117 if (seed == 0) { 118 /* Select a pseudo-random seed on first call to avoid 119 to generate the same sequence of pattern */ 120 struct timeval tv; 121 gettimeofday(&tv, 0); 122 seed = (getpid() << 16) ^ getuid() ^ tv.tv_sec ^ tv.tv_usec; 123 } 124 while (trv >= path && *trv == 'X') { 125 uint32_t value = rand_r(&seed) % (sizeof(padchar) - 1); 126 *trv-- = padchar[value]; 127 } 128 start = trv + 1; 129 130 /* 131 * check the target directory. 132 */ 133 if (doopen != NULL || domkdir) { 134 for (; trv > path; --trv) { 135 if (*trv == '/') { 136 *trv = '\0'; 137 rval = stat(path, &sbuf); 138 *trv = '/'; 139 if (rval != 0) 140 return 0; 141 if (!S_ISDIR(sbuf.st_mode)) { 142 __set_errno(ENOTDIR); 143 return 0; 144 } 145 break; 146 } 147 } 148 } 149 150 for (;;) { 151 if (doopen) { 152 if ((*doopen = open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 153 return 1; 154 if (errno != EEXIST) 155 return 0; 156 } else if (domkdir) { 157 if (mkdir(path, 0700) == 0) 158 return 1; 159 if (errno != EEXIST) 160 return 0; 161 } else if (lstat(path, &sbuf)) 162 return errno == ENOENT; 163 164 /* If we have a collision, cycle through the space of filenames */ 165 for (trv = start;;) { 166 if (*trv == '\0' || trv == suffp) 167 return 0; 168 pad = strchr(padchar, *trv); 169 if (pad == NULL || *++pad == '\0') 170 *trv++ = padchar[0]; 171 else { 172 *trv++ = *pad; 173 break; 174 } 175 } 176 } 177 178 /* not reached */ 179 } 180