gettemp.c revision 1.15.2.2
1 1.15.2.1 tls /* $NetBSD: gettemp.c,v 1.15.2.2 2014/08/20 00:02:16 tls Exp $ */ 2 1.1 mycroft 3 1.1 mycroft /* 4 1.1 mycroft * Copyright (c) 1987, 1993 5 1.1 mycroft * The Regents of the University of California. All rights reserved. 6 1.1 mycroft * 7 1.1 mycroft * Redistribution and use in source and binary forms, with or without 8 1.1 mycroft * modification, are permitted provided that the following conditions 9 1.1 mycroft * are met: 10 1.1 mycroft * 1. Redistributions of source code must retain the above copyright 11 1.1 mycroft * notice, this list of conditions and the following disclaimer. 12 1.1 mycroft * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 mycroft * notice, this list of conditions and the following disclaimer in the 14 1.1 mycroft * documentation and/or other materials provided with the distribution. 15 1.10 agc * 3. Neither the name of the University nor the names of its contributors 16 1.1 mycroft * may be used to endorse or promote products derived from this software 17 1.1 mycroft * without specific prior written permission. 18 1.1 mycroft * 19 1.1 mycroft * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 1.1 mycroft * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 1.1 mycroft * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 1.1 mycroft * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 1.1 mycroft * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 1.1 mycroft * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 1.1 mycroft * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 1.1 mycroft * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 1.1 mycroft * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 1.1 mycroft * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 1.1 mycroft * SUCH DAMAGE. 30 1.1 mycroft */ 31 1.1 mycroft 32 1.15.2.2 tls #include "gettemp.h" 33 1.8 thorpej 34 1.12 lukem #if !HAVE_NBTOOL_CONFIG_H || !HAVE_MKSTEMP || !HAVE_MKDTEMP 35 1.8 thorpej 36 1.1 mycroft #include <sys/cdefs.h> 37 1.1 mycroft #if defined(LIBC_SCCS) && !defined(lint) 38 1.1 mycroft #if 0 39 1.1 mycroft static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93"; 40 1.1 mycroft #else 41 1.15.2.1 tls __RCSID("$NetBSD: gettemp.c,v 1.15.2.2 2014/08/20 00:02:16 tls Exp $"); 42 1.1 mycroft #endif 43 1.1 mycroft #endif /* LIBC_SCCS and not lint */ 44 1.1 mycroft 45 1.15.2.2 tls #include <sys/param.h> 46 1.1 mycroft #include <fcntl.h> 47 1.15.2.2 tls #include <string.h> 48 1.9 thorpej 49 1.15.2.2 tls static const unsigned char padchar[] = 50 1.15.2.2 tls "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 51 1.1 mycroft 52 1.1 mycroft int 53 1.15.2.2 tls GETTEMP(char *path, int *doopen, int domkdir, int slen, int oflags) 54 1.1 mycroft { 55 1.15.2.2 tls char *start, *trv, *suffp, *carryp; 56 1.15.2.2 tls char *pad; 57 1.1 mycroft struct stat sbuf; 58 1.15.2.2 tls int rval; 59 1.15.2.2 tls uint32_t r; 60 1.15.2.2 tls char carrybuf[MAXPATHLEN]; 61 1.4 lukem 62 1.4 lukem _DIAGASSERT(path != NULL); 63 1.4 lukem /* doopen may be NULL */ 64 1.15.2.2 tls if ((doopen != NULL && domkdir) || slen < 0 || 65 1.15.2.2 tls (oflags & ~(O_APPEND | O_DIRECT | O_SHLOCK | O_EXLOCK | O_SYNC | 66 1.15.2.2 tls O_CLOEXEC)) != 0) { 67 1.15.2.2 tls errno = EINVAL; 68 1.15.2.2 tls return 0; 69 1.15.2.2 tls } 70 1.1 mycroft 71 1.15.2.2 tls for (trv = path; *trv != '\0'; ++trv) 72 1.15.2.2 tls continue; 73 1.1 mycroft 74 1.15.2.2 tls if (trv - path >= MAXPATHLEN) { 75 1.15.2.2 tls errno = ENAMETOOLONG; 76 1.15.2.2 tls return 0; 77 1.1 mycroft } 78 1.15.2.2 tls trv -= slen; 79 1.15.2.2 tls suffp = trv; 80 1.15.2.2 tls --trv; 81 1.15.2.2 tls if (trv < path || NULL != strchr(suffp, '/')) { 82 1.15.2.2 tls errno = EINVAL; 83 1.15.2.2 tls return 0; 84 1.15.2.2 tls } 85 1.15.2.2 tls 86 1.15.2.2 tls /* Fill space with random characters */ 87 1.15.2.2 tls while (trv >= path && *trv == 'X') { 88 1.15.2.2 tls r = arc4random_uniform(sizeof(padchar) - 1); 89 1.15.2.2 tls *trv-- = padchar[r]; 90 1.15.2.2 tls } 91 1.15.2.2 tls start = trv + 1; 92 1.15.2.2 tls 93 1.15.2.2 tls /* save first combination of random characters */ 94 1.15.2.2 tls memcpy(carrybuf, start, suffp - start); 95 1.1 mycroft 96 1.1 mycroft /* 97 1.15.2.2 tls * check the target directory. 98 1.1 mycroft */ 99 1.15.2.2 tls if (doopen != NULL || domkdir) { 100 1.15.2.2 tls for (; trv > path; --trv) { 101 1.15.2.2 tls if (*trv == '/') { 102 1.15.2.2 tls *trv = '\0'; 103 1.15.2.2 tls rval = stat(path, &sbuf); 104 1.15.2.2 tls *trv = '/'; 105 1.15.2.2 tls if (rval != 0) 106 1.15.2.2 tls return 0; 107 1.15.2.2 tls if (!S_ISDIR(sbuf.st_mode)) { 108 1.15.2.2 tls errno = ENOTDIR; 109 1.15.2.2 tls return 0; 110 1.15.2.2 tls } 111 1.15.2.2 tls break; 112 1.1 mycroft } 113 1.1 mycroft } 114 1.1 mycroft } 115 1.1 mycroft 116 1.1 mycroft for (;;) { 117 1.1 mycroft if (doopen) { 118 1.15.2.2 tls if ((*doopen = open(path, O_CREAT|O_EXCL|O_RDWR|oflags, 119 1.15.2.2 tls 0600)) != -1) 120 1.15 christos return 1; 121 1.1 mycroft if (errno != EEXIST) 122 1.15 christos return 0; 123 1.2 mycroft } else if (domkdir) { 124 1.15.2.2 tls if (mkdir(path, 0700) != -1) 125 1.15 christos return 1; 126 1.2 mycroft if (errno != EEXIST) 127 1.15 christos return 0; 128 1.2 mycroft } else if (lstat(path, &sbuf)) 129 1.15.2.2 tls return errno == ENOENT; 130 1.1 mycroft 131 1.15.2.2 tls /* 132 1.15.2.2 tls * If we have a collision, 133 1.15.2.2 tls * cycle through the space of filenames 134 1.15.2.2 tls */ 135 1.15.2.2 tls for (trv = start, carryp = carrybuf;;) { 136 1.15.2.2 tls /* have we tried all possible permutations? */ 137 1.15.2.2 tls if (trv == suffp) 138 1.15.2.2 tls return 0; /* yes - exit with EEXIST */ 139 1.15.2.2 tls pad = strchr((const char *)padchar, *trv); 140 1.15.2.2 tls if (pad == NULL) { 141 1.15.2.2 tls /* this should never happen */ 142 1.15.2.2 tls errno = EIO; 143 1.15 christos return 0; 144 1.15.2.2 tls } 145 1.15.2.2 tls /* increment character */ 146 1.15.2.2 tls *trv = (*++pad == '\0') ? padchar[0] : *pad; 147 1.15.2.2 tls /* carry to next position? */ 148 1.15.2.2 tls if (*trv == *carryp) { 149 1.15.2.2 tls /* increment position and loop */ 150 1.15.2.2 tls ++trv; 151 1.15.2.2 tls ++carryp; 152 1.15.2.2 tls } else { 153 1.15.2.2 tls /* try with new name */ 154 1.1 mycroft break; 155 1.1 mycroft } 156 1.1 mycroft } 157 1.1 mycroft } 158 1.1 mycroft /*NOTREACHED*/ 159 1.1 mycroft } 160 1.8 thorpej 161 1.12 lukem #endif /* !HAVE_NBTOOL_CONFIG_H || !HAVE_MKSTEMP || !HAVE_MKDTEMP */ 162
Indexes created Thu Oct 02 01:09:59 GMT 2025