1 /* $OpenBSD: fsutil.c,v 1.24 2019/06/28 13:32:43 deraadt Exp $ */ 2 /* $NetBSD: fsutil.c,v 1.2 1996/10/03 20:06:31 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <stdio.h> 34 #include <string.h> 35 #include <stdlib.h> 36 #include <stdarg.h> 37 #include <errno.h> 38 #include <fstab.h> 39 #include <limits.h> 40 #include <err.h> 41 42 #include <sys/types.h> 43 #include <sys/stat.h> 44 45 #include "fsutil.h" 46 47 static const char *dev = NULL; 48 static const char *origdev = NULL; 49 static int hot = 0; 50 static int preen = 0; 51 52 extern char *__progname; 53 54 static void vmsg(int, const char *, va_list); 55 56 struct stat stslash; 57 58 void 59 checkroot(void) 60 { 61 if (stat("/", &stslash) == -1) { 62 xperror("/"); 63 printf("Can't stat root\n"); 64 } 65 } 66 67 void 68 setcdevname(const char *cd, const char *ocd, int pr) 69 { 70 dev = cd; 71 origdev = ocd; 72 preen = pr; 73 } 74 75 const char * 76 cdevname(void) 77 { 78 return dev; 79 } 80 81 int 82 hotroot(void) 83 { 84 return hot; 85 } 86 87 void 88 errexit(const char *fmt, ...) 89 { 90 va_list ap; 91 92 va_start(ap, fmt); 93 (void) vfprintf(stderr, fmt, ap); 94 va_end(ap); 95 exit(8); 96 } 97 98 static void 99 vmsg(int fatal, const char *fmt, va_list ap) 100 { 101 if (!fatal && preen) { 102 if (origdev) 103 printf("%s (%s): ", dev, origdev); 104 else 105 printf("%s: ", dev); 106 } 107 108 (void) vprintf(fmt, ap); 109 110 if (fatal && preen) { 111 printf("\n"); 112 if (origdev) 113 printf("%s (%s): ", dev, origdev); 114 else 115 printf("%s: ", dev); 116 printf("UNEXPECTED INCONSISTENCY; RUN %s MANUALLY.\n", 117 __progname); 118 exit(8); 119 } 120 } 121 122 void 123 pfatal(const char *fmt, ...) 124 { 125 va_list ap; 126 127 va_start(ap, fmt); 128 vmsg(1, fmt, ap); 129 va_end(ap); 130 } 131 132 void 133 pwarn(const char *fmt, ...) 134 { 135 va_list ap; 136 137 va_start(ap, fmt); 138 vmsg(0, fmt, ap); 139 va_end(ap); 140 } 141 142 void 143 xperror(const char *s) 144 { 145 pfatal("%s (%s)", s, strerror(errno)); 146 } 147 148 void 149 panic(const char *fmt, ...) 150 { 151 va_list ap; 152 153 va_start(ap, fmt); 154 vmsg(1, fmt, ap); 155 va_end(ap); 156 exit(8); 157 } 158 159 char * 160 unrawname(char *name) 161 { 162 char *dp; 163 struct stat stb; 164 165 if ((dp = strrchr(name, '/')) == NULL) 166 return (name); 167 if (stat(name, &stb) == -1) 168 return (name); 169 if (!S_ISCHR(stb.st_mode)) 170 return (name); 171 if (dp[1] != 'r') 172 return (name); 173 (void)memmove(&dp[1], &dp[2], strlen(&dp[2]) + 1); 174 return (name); 175 } 176 177 char * 178 rawname(char *name) 179 { 180 static char rawbuf[PATH_MAX]; 181 char *dp; 182 183 if ((dp = strrchr(name, '/')) == NULL) 184 return (0); 185 *dp = 0; 186 (void)strlcpy(rawbuf, name, sizeof rawbuf); 187 *dp = '/'; 188 (void)strlcat(rawbuf, "/r", sizeof rawbuf); 189 (void)strlcat(rawbuf, &dp[1], sizeof rawbuf); 190 return (rawbuf); 191 } 192 193 char * 194 blockcheck(char *origname) 195 { 196 struct stat stblock, stchar; 197 char *newname, *raw; 198 struct fstab *fsp; 199 int retried = 0; 200 201 hot = 0; 202 newname = origname; 203 retry: 204 if (stat(newname, &stblock) == -1) 205 return (origname); 206 207 if (S_ISBLK(stblock.st_mode)) { 208 if (stslash.st_dev == stblock.st_rdev) 209 hot++; 210 raw = rawname(newname); 211 if (stat(raw, &stchar) == -1) { 212 xperror(raw); 213 printf("Can't stat %s\n", raw); 214 return (origname); 215 } 216 if (S_ISCHR(stchar.st_mode)) { 217 return (raw); 218 } else { 219 printf("%s is not a character device\n", raw); 220 return (origname); 221 } 222 } else if (S_ISCHR(stblock.st_mode) && !retried) { 223 newname = unrawname(newname); 224 retried++; 225 goto retry; 226 } else if ((fsp = getfsfile(newname)) != 0 && !retried) { 227 newname = fsp->fs_spec; 228 retried++; 229 goto retry; 230 } 231 /* 232 * Not a block or character device, just return name and 233 * let the user decide whether to use it. 234 */ 235 return (origname); 236 } 237 238 239 void * 240 emalloc(size_t s) 241 { 242 void *p; 243 244 if (s == 0) 245 err(1, "malloc failed"); 246 p = malloc(s); 247 if (p == NULL) 248 err(1, "malloc failed"); 249 return p; 250 } 251 252 253 void * 254 ereallocarray(void *p, size_t n, size_t s) 255 { 256 void *newp; 257 258 if (n == 0 || s == 0) { 259 free(p); 260 err(1, "realloc failed"); 261 } 262 newp = reallocarray(p, n, s); 263 if (newp == NULL) { 264 free(p); 265 err(1, "realloc failed"); 266 } 267 return newp; 268 } 269 270 271 char * 272 estrdup(const char *s) 273 { 274 char *p = strdup(s); 275 if (p == NULL) 276 err(1, "strdup failed"); 277 return p; 278 } 279