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 #if 0 55 int 56 mkstemps(char *path, int slen) 57 { 58 int fd; 59 return _gettemp(path, &fd, 0, slen) ? fd : -1; 60 } 61 #endif 62 63 64 int 65 mkstemp(char *path) 66 { 67 int fd; 68 if (_gettemp(path, &fd, 0, 0)) 69 return fd; 70 71 return -1; 72 } 73 74 75 char * 76 mkdtemp(path) 77 char *path; 78 { 79 return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL); 80 } 81 82 83 char * 84 mktemp(char *path) 85 { 86 if (_gettemp(path, (int *)NULL, 0, 0)) 87 return path; 88 89 return NULL; 90 } 91 92 93 static int 94 _gettemp(char *path, int *doopen, int domkdir, int slen) 95 { 96 char *start, *trv, *suffp; 97 char *pad; 98 struct stat sbuf; 99 int rval; 100 static unsigned int seed = 0; 101 102 if (doopen != NULL && domkdir) { 103 __set_errno(EINVAL); 104 return 0; 105 } 106 107 for (trv = path; *trv != '\0'; ++trv) 108 ; 109 110 trv -= slen; 111 suffp = trv; 112 --trv; 113 if (trv < path) { 114 __set_errno(EINVAL); 115 return 0; 116 } 117 118 /* Fill space with random characters */ 119 if (seed == 0) { 120 /* Select a pseudo-random seed on first call to avoid 121 to generate the same sequence of pattern */ 122 struct timeval tv; 123 gettimeofday(&tv, 0); 124 seed = (getpid() << 16) ^ getuid() ^ tv.tv_sec ^ tv.tv_usec; 125 } 126 while (trv >= path && *trv == 'X') { 127 uint32_t value = rand_r(&seed) % (sizeof(padchar) - 1); 128 *trv-- = padchar[value]; 129 } 130 start = trv + 1; 131 132 /* 133 * check the target directory. 134 */ 135 if (doopen != NULL || domkdir) { 136 for (; trv > path; --trv) { 137 if (*trv == '/') { 138 *trv = '\0'; 139 rval = stat(path, &sbuf); 140 *trv = '/'; 141 if (rval != 0) 142 return 0; 143 if (!S_ISDIR(sbuf.st_mode)) { 144 __set_errno(ENOTDIR); 145 return 0; 146 } 147 break; 148 } 149 } 150 } 151 152 for (;;) { 153 if (doopen) { 154 if ((*doopen = open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 155 return 1; 156 if (errno != EEXIST) 157 return 0; 158 } else if (domkdir) { 159 if (mkdir(path, 0700) == 0) 160 return 1; 161 if (errno != EEXIST) 162 return 0; 163 } else if (lstat(path, &sbuf)) 164 return errno == ENOENT; 165 166 /* If we have a collision, cycle through the space of filenames */ 167 for (trv = start;;) { 168 if (*trv == '\0' || trv == suffp) 169 return 0; 170 pad = strchr(padchar, *trv); 171 if (pad == NULL || *++pad == '\0') 172 *trv++ = padchar[0]; 173 else { 174 *trv++ = *pad; 175 break; 176 } 177 } 178 } 179 180 /* not reached */ 181 } 182