rm.c revision 1.38
1 /* $NetBSD: rm.c,v 1.38 2003/09/14 19:20:25 jschauma Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993, 1994, 2003 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1990, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)rm.c 8.8 (Berkeley) 4/27/95"; 41 #else 42 __RCSID("$NetBSD: rm.c,v 1.38 2003/09/14 19:20:25 jschauma Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 #include <sys/types.h> 49 50 #include <err.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <fts.h> 54 #include <grp.h> 55 #include <locale.h> 56 #include <pwd.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 #include <vis.h> 62 63 int dflag, eval, fflag, iflag, Pflag, stdin_ok, vflag, Wflag; 64 65 int check(char *, char *, struct stat *); 66 void checkdot(char **); 67 void rm_file(char **); 68 void rm_overwrite(char *, struct stat *); 69 void rm_tree(char **); 70 void usage(void); 71 int main(int, char *[]); 72 73 /* 74 * For the sake of the `-f' flag, check whether an error number indicates the 75 * failure of an operation due to an non-existent file, either per se (ENOENT) 76 * or because its filename argument was illegal (ENAMETOOLONG, ENOTDIR). 77 */ 78 #define NONEXISTENT(x) \ 79 ((x) == ENOENT || (x) == ENAMETOOLONG || (x) == ENOTDIR) 80 81 /* 82 * rm -- 83 * This rm is different from historic rm's, but is expected to match 84 * POSIX 1003.2 behavior. The most visible difference is that -f 85 * has two specific effects now, ignore non-existent files and force 86 * file removal. 87 */ 88 int 89 main(int argc, char *argv[]) 90 { 91 int ch, rflag; 92 93 setprogname(argv[0]); 94 (void)setlocale(LC_ALL, ""); 95 96 Pflag = rflag = 0; 97 while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1) 98 switch (ch) { 99 case 'd': 100 dflag = 1; 101 break; 102 case 'f': 103 fflag = 1; 104 iflag = 0; 105 break; 106 case 'i': 107 fflag = 0; 108 iflag = 1; 109 break; 110 case 'P': 111 Pflag = 1; 112 break; 113 case 'R': 114 case 'r': /* Compatibility. */ 115 rflag = 1; 116 break; 117 case 'v': 118 vflag = 1; 119 break; 120 case 'W': 121 Wflag = 1; 122 break; 123 case '?': 124 default: 125 usage(); 126 } 127 argc -= optind; 128 argv += optind; 129 130 if (argc < 1) 131 usage(); 132 133 checkdot(argv); 134 135 if (*argv) { 136 stdin_ok = isatty(STDIN_FILENO); 137 138 if (rflag) 139 rm_tree(argv); 140 else 141 rm_file(argv); 142 } 143 144 exit(eval); 145 /* NOTREACHED */ 146 } 147 148 void 149 rm_tree(char **argv) 150 { 151 FTS *fts; 152 FTSENT *p; 153 int flags, needstat, rval; 154 155 /* 156 * Remove a file hierarchy. If forcing removal (-f), or interactive 157 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 158 */ 159 needstat = !fflag && !iflag && stdin_ok; 160 161 /* 162 * If the -i option is specified, the user can skip on the pre-order 163 * visit. The fts_number field flags skipped directories. 164 */ 165 #define SKIPPED 1 166 167 flags = FTS_PHYSICAL; 168 if (!needstat) 169 flags |= FTS_NOSTAT; 170 if (Wflag) 171 flags |= FTS_WHITEOUT; 172 if (!(fts = fts_open(argv, flags, 173 (int (*)(const FTSENT **, const FTSENT **))NULL))) 174 err(1, NULL); 175 while ((p = fts_read(fts)) != NULL) { 176 177 switch (p->fts_info) { 178 case FTS_DNR: 179 if (!fflag || p->fts_errno != ENOENT) { 180 warnx("%s: %s", p->fts_path, 181 strerror(p->fts_errno)); 182 eval = 1; 183 } 184 continue; 185 case FTS_ERR: 186 errx(EXIT_FAILURE, "%s: %s", p->fts_path, 187 strerror(p->fts_errno)); 188 /* NOTREACHED */ 189 case FTS_NS: 190 /* 191 * FTS_NS: assume that if can't stat the file, it 192 * can't be unlinked. 193 */ 194 if (fflag && NONEXISTENT(p->fts_errno)) 195 continue; 196 if (needstat) { 197 warnx("%s: %s", p->fts_path, 198 strerror(p->fts_errno)); 199 eval = 1; 200 continue; 201 } 202 break; 203 case FTS_D: 204 /* Pre-order: give user chance to skip. */ 205 if (!fflag && !check(p->fts_path, p->fts_accpath, 206 p->fts_statp)) { 207 (void)fts_set(fts, p, FTS_SKIP); 208 p->fts_number = SKIPPED; 209 } 210 continue; 211 case FTS_DP: 212 /* Post-order: see if user skipped. */ 213 if (p->fts_number == SKIPPED) 214 continue; 215 break; 216 default: 217 if (!fflag && 218 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 219 continue; 220 } 221 222 rval = 0; 223 /* 224 * If we can't read or search the directory, may still be 225 * able to remove it. Don't print out the un{read,search}able 226 * message unless the remove fails. 227 */ 228 switch (p->fts_info) { 229 case FTS_DP: 230 case FTS_DNR: 231 rval = rmdir(p->fts_accpath); 232 if (rval != 0 && fflag && errno == ENOENT) 233 continue; 234 break; 235 236 case FTS_W: 237 rval = undelete(p->fts_accpath); 238 if (rval != 0 && fflag && errno == ENOENT) 239 continue; 240 break; 241 242 default: 243 if (Pflag) 244 rm_overwrite(p->fts_accpath, NULL); 245 rval = unlink(p->fts_accpath); 246 if (rval != 0 && fflag && NONEXISTENT(errno)) 247 continue; 248 break; 249 } 250 if (rval != 0) { 251 warn("%s", p->fts_path); 252 eval = 1; 253 } else if (vflag) 254 (void)printf("%s\n", p->fts_path); 255 } 256 if (errno) 257 err(1, "fts_read"); 258 } 259 260 void 261 rm_file(char **argv) 262 { 263 struct stat sb; 264 int rval; 265 char *f; 266 267 /* 268 * Remove a file. POSIX 1003.2 states that, by default, attempting 269 * to remove a directory is an error, so must always stat the file. 270 */ 271 while ((f = *argv++) != NULL) { 272 /* Assume if can't stat the file, can't unlink it. */ 273 if (lstat(f, &sb)) { 274 if (Wflag) { 275 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 276 } else { 277 if (!fflag || !NONEXISTENT(errno)) { 278 warn("%s", f); 279 eval = 1; 280 } 281 continue; 282 } 283 } else if (Wflag) { 284 warnx("%s: %s", f, strerror(EEXIST)); 285 eval = 1; 286 continue; 287 } 288 289 if (S_ISDIR(sb.st_mode) && !dflag) { 290 warnx("%s: is a directory", f); 291 eval = 1; 292 continue; 293 } 294 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 295 continue; 296 if (S_ISWHT(sb.st_mode)) 297 rval = undelete(f); 298 else if (S_ISDIR(sb.st_mode)) 299 rval = rmdir(f); 300 else { 301 if (Pflag) 302 rm_overwrite(f, &sb); 303 rval = unlink(f); 304 } 305 if (rval && (!fflag || !NONEXISTENT(errno))) { 306 warn("%s", f); 307 eval = 1; 308 } 309 if (vflag && rval == 0) 310 (void)printf("%s\n", f); 311 } 312 } 313 314 /* 315 * rm_overwrite -- 316 * Overwrite the file 3 times with varying bit patterns. 317 * 318 * XXX 319 * This is a cheap way to *really* delete files. Note that only regular 320 * files are deleted, directories (and therefore names) will remain. 321 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 322 * System V file system). In a logging file system, you'll have to have 323 * kernel support. 324 */ 325 void 326 rm_overwrite(char *file, struct stat *sbp) 327 { 328 struct stat sb; 329 off_t len; 330 int fd, wlen; 331 char buf[8 * 1024]; 332 333 fd = -1; 334 if (sbp == NULL) { 335 if (lstat(file, &sb)) 336 goto err; 337 sbp = &sb; 338 } 339 if (!S_ISREG(sbp->st_mode)) 340 return; 341 if ((fd = open(file, O_WRONLY, 0)) == -1) 342 goto err; 343 344 #define PASS(byte) do { \ 345 memset(buf, byte, sizeof(buf)); \ 346 for (len = sbp->st_size; len > 0; len -= wlen) { \ 347 wlen = len < sizeof(buf) ? len : sizeof(buf); \ 348 if (write(fd, buf, wlen) != wlen) \ 349 goto err; \ 350 } \ 351 } while (/* CONSTCOND */ 0) 352 PASS(0xff); 353 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 354 goto err; 355 PASS(0x00); 356 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 357 goto err; 358 PASS(0xff); 359 if (!fsync(fd) && !close(fd)) 360 return; 361 362 err: eval = 1; 363 warn("%s", file); 364 } 365 366 int 367 check(char *path, char *name, struct stat *sp) 368 { 369 int ch, first; 370 char modep[15]; 371 372 /* Check -i first. */ 373 if (iflag) 374 (void)fprintf(stderr, "remove '%s'? ", path); 375 else { 376 /* 377 * If it's not a symbolic link and it's unwritable and we're 378 * talking to a terminal, ask. Symbolic links are excluded 379 * because their permissions are meaningless. Check stdin_ok 380 * first because we may not have stat'ed the file. 381 */ 382 if (!stdin_ok || S_ISLNK(sp->st_mode) || 383 !(access(name, W_OK) && (errno != ETXTBSY))) 384 return (1); 385 strmode(sp->st_mode, modep); 386 (void)fprintf(stderr, "override %s%s%s/%s for '%s'? ", 387 modep + 1, modep[9] == ' ' ? "" : " ", 388 user_from_uid(sp->st_uid, 0), 389 group_from_gid(sp->st_gid, 0), path); 390 } 391 (void)fflush(stderr); 392 393 first = ch = getchar(); 394 while (ch != '\n' && ch != EOF) 395 ch = getchar(); 396 return (first == 'y' || first == 'Y'); 397 } 398 399 /* 400 * POSIX.2 requires that if "." or ".." are specified as the basename 401 * portion of an operand, a diagnostic message be written to standard 402 * error and nothing more be done with such operands. 403 * 404 * Since POSIX.2 defines basename as the final portion of a path after 405 * trailing slashes have been removed, we'll remove them here. 406 */ 407 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 408 void 409 checkdot(char **argv) 410 { 411 char *p, **save, **t; 412 int complained; 413 414 complained = 0; 415 for (t = argv; *t;) { 416 /* strip trailing slashes */ 417 p = strrchr(*t, '\0'); 418 while (--p > *t && *p == '/') 419 *p = '\0'; 420 421 /* extract basename */ 422 if ((p = strrchr(*t, '/')) != NULL) 423 ++p; 424 else 425 p = *t; 426 427 if (ISDOT(p)) { 428 if (!complained++) 429 warnx("\".\" and \"..\" may not be removed"); 430 eval = 1; 431 for (save = t; (t[0] = t[1]) != NULL; ++t) 432 continue; 433 t = save; 434 } else 435 ++t; 436 } 437 } 438 439 void 440 usage(void) 441 { 442 443 (void)fprintf(stderr, "usage: %s [-f|-i] [-dPRrvW] file ...\n", 444 getprogname()); 445 exit(1); 446 /* NOTREACHED */ 447 } 448
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