1 /*- 2 * Copyright (c) 1990, 1993, 1994 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if 0 31 #ifndef lint 32 static const char copyright[] = 33 "@(#) Copyright (c) 1990, 1993, 1994\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35 #endif /* not lint */ 36 37 #ifndef lint 38 static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94"; 39 #endif /* not lint */ 40 #endif 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/stat.h> 45 #include <sys/param.h> 46 #include <sys/mount.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <fts.h> 52 #include <grp.h> 53 #include <pwd.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <sysexits.h> 58 #include <unistd.h> 59 60 int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok; 61 uid_t uid; 62 63 int check(char *, char *, struct stat *); 64 void checkdot(char **); 65 void rm_file(char **); 66 int rm_overwrite(char *, struct stat *); 67 void rm_tree(char **); 68 void usage(void); 69 70 /* 71 * rm -- 72 * This rm is different from historic rm's, but is expected to match 73 * POSIX 1003.2 behavior. The most visible difference is that -f 74 * has two specific effects now, ignore non-existent files and force 75 * file removal. 76 */ 77 int 78 main(int argc, char *argv[]) 79 { 80 int ch, rflag; 81 char *p; 82 83 /* 84 * Test for the special case where the utility is called as 85 * "unlink", for which the functionality provided is greatly 86 * simplified. 87 */ 88 if ((p = rindex(argv[0], '/')) == NULL) 89 p = argv[0]; 90 else 91 ++p; 92 if (strcmp(p, "unlink") == 0) { 93 while (getopt(argc, argv, "") != -1) 94 usage(); 95 argc -= optind; 96 argv += optind; 97 if (argc != 1) 98 usage(); 99 rm_file(&argv[0]); 100 exit(eval); 101 } 102 103 Pflag = rflag = 0; 104 while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1) 105 switch(ch) { 106 case 'd': 107 dflag = 1; 108 break; 109 case 'f': 110 fflag = 1; 111 iflag = 0; 112 break; 113 case 'i': 114 fflag = 0; 115 iflag = 1; 116 break; 117 case 'P': 118 Pflag = 1; 119 break; 120 case 'R': 121 case 'r': /* Compatibility. */ 122 rflag = 1; 123 break; 124 case 'v': 125 vflag = 1; 126 break; 127 case 'W': 128 Wflag = 1; 129 break; 130 default: 131 usage(); 132 } 133 argc -= optind; 134 argv += optind; 135 136 if (argc < 1) { 137 if (fflag) 138 return (0); 139 usage(); 140 } 141 142 checkdot(argv); 143 uid = geteuid(); 144 145 if (*argv) { 146 stdin_ok = isatty(STDIN_FILENO); 147 148 if (rflag) 149 rm_tree(argv); 150 else 151 rm_file(argv); 152 } 153 154 exit (eval); 155 } 156 157 void 158 rm_tree(char **argv) 159 { 160 FTS *fts; 161 FTSENT *p; 162 int needstat; 163 int flags; 164 int rval; 165 166 /* 167 * Remove a file hierarchy. If forcing removal (-f), or interactive 168 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 169 */ 170 needstat = !uid || (!fflag && !iflag && stdin_ok); 171 172 /* 173 * If the -i option is specified, the user can skip on the pre-order 174 * visit. The fts_number field flags skipped directories. 175 */ 176 #define SKIPPED 1 177 178 flags = FTS_PHYSICAL; 179 if (!needstat) 180 flags |= FTS_NOSTAT; 181 if (Wflag) 182 flags |= FTS_WHITEOUT; 183 if (!(fts = fts_open(argv, flags, NULL))) 184 err(1, "fts_open"); 185 while ((p = fts_read(fts)) != NULL) { 186 switch (p->fts_info) { 187 case FTS_DNR: 188 if (!fflag || p->fts_errno != ENOENT) { 189 warnx("%s: %s", 190 p->fts_path, strerror(p->fts_errno)); 191 eval = 1; 192 } 193 continue; 194 case FTS_ERR: 195 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 196 case FTS_NS: 197 /* 198 * Assume that since fts_read() couldn't stat the 199 * file, it can't be unlinked. 200 */ 201 if (!needstat) 202 break; 203 if (!fflag || p->fts_errno != ENOENT) { 204 warnx("%s: %s", 205 p->fts_path, strerror(p->fts_errno)); 206 eval = 1; 207 } 208 continue; 209 case FTS_D: 210 /* Pre-order: give user chance to skip. */ 211 if (!fflag && !check(p->fts_path, p->fts_accpath, 212 p->fts_statp)) { 213 (void)fts_set(fts, p, FTS_SKIP); 214 p->fts_number = SKIPPED; 215 } 216 else if (!uid && 217 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 218 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 219 chflags(p->fts_accpath, 220 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0) 221 goto err; 222 continue; 223 case FTS_DP: 224 /* Post-order: see if user skipped. */ 225 if (p->fts_number == SKIPPED) 226 continue; 227 break; 228 default: 229 if (!fflag && 230 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 231 continue; 232 } 233 234 rval = 0; 235 if (!uid && 236 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 237 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE))) 238 rval = chflags(p->fts_accpath, 239 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); 240 if (rval == 0) { 241 /* 242 * If we can't read or search the directory, may still be 243 * able to remove it. Don't print out the un{read,search}able 244 * message unless the remove fails. 245 */ 246 switch (p->fts_info) { 247 case FTS_DP: 248 case FTS_DNR: 249 rval = rmdir(p->fts_accpath); 250 if (rval == 0 || (fflag && errno == ENOENT)) { 251 if (rval == 0 && vflag) 252 (void)printf("%s\n", 253 p->fts_path); 254 continue; 255 } 256 break; 257 258 case FTS_W: 259 rval = undelete(p->fts_accpath); 260 if (rval == 0 && (fflag && errno == ENOENT)) { 261 if (vflag) 262 (void)printf("%s\n", 263 p->fts_path); 264 continue; 265 } 266 break; 267 268 case FTS_NS: 269 /* 270 * Assume that since fts_read() couldn't stat 271 * the file, it can't be unlinked. 272 */ 273 if (fflag) 274 continue; 275 /* FALLTHROUGH */ 276 default: 277 if (Pflag) 278 if (!rm_overwrite(p->fts_accpath, NULL)) 279 continue; 280 rval = unlink(p->fts_accpath); 281 if (rval == 0 || (fflag && errno == ENOENT)) { 282 if (rval == 0 && vflag) 283 (void)printf("%s\n", 284 p->fts_path); 285 continue; 286 } 287 } 288 } 289 err: 290 warn("%s", p->fts_path); 291 eval = 1; 292 } 293 if (errno) 294 err(1, "fts_read"); 295 } 296 297 void 298 rm_file(char **argv) 299 { 300 struct stat sb; 301 int rval; 302 char *f; 303 304 /* 305 * Remove a file. POSIX 1003.2 states that, by default, attempting 306 * to remove a directory is an error, so must always stat the file. 307 */ 308 while ((f = *argv++) != NULL) { 309 /* Assume if can't stat the file, can't unlink it. */ 310 if (lstat(f, &sb)) { 311 if (Wflag) { 312 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 313 } else { 314 if (!fflag || errno != ENOENT) { 315 warn("%s", f); 316 eval = 1; 317 } 318 continue; 319 } 320 } else if (Wflag) { 321 warnx("%s: %s", f, strerror(EEXIST)); 322 eval = 1; 323 continue; 324 } 325 326 if (S_ISDIR(sb.st_mode) && !dflag) { 327 warnx("%s: is a directory", f); 328 eval = 1; 329 continue; 330 } 331 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 332 continue; 333 rval = 0; 334 if (!uid && 335 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) && 336 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE))) 337 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE)); 338 if (rval == 0) { 339 if (S_ISWHT(sb.st_mode)) 340 rval = undelete(f); 341 else if (S_ISDIR(sb.st_mode)) 342 rval = rmdir(f); 343 else { 344 if (Pflag) 345 if (!rm_overwrite(f, &sb)) 346 continue; 347 rval = unlink(f); 348 } 349 } 350 if (rval && (!fflag || errno != ENOENT)) { 351 warn("%s", f); 352 eval = 1; 353 } 354 if (vflag && rval == 0) 355 (void)printf("%s\n", f); 356 } 357 } 358 359 /* 360 * rm_overwrite -- 361 * Overwrite the file 3 times with varying bit patterns. 362 * 363 * XXX 364 * This is a cheap way to *really* delete files. Note that only regular 365 * files are deleted, directories (and therefore names) will remain. 366 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 367 * System V file system). In a logging file system, you'll have to have 368 * kernel support. 369 */ 370 int 371 rm_overwrite(char *file, struct stat *sbp) 372 { 373 struct stat sb; 374 struct statfs fsb; 375 off_t len; 376 int bsize, fd, wlen; 377 char *buf = NULL; 378 379 fd = -1; 380 if (sbp == NULL) { 381 if (lstat(file, &sb)) 382 goto err; 383 sbp = &sb; 384 } 385 if (!S_ISREG(sbp->st_mode)) 386 return (1); 387 if ((fd = open(file, O_WRONLY, 0)) == -1) 388 goto err; 389 if (fstatfs(fd, &fsb) == -1) 390 goto err; 391 bsize = MAX(fsb.f_iosize, 1024); 392 if ((buf = malloc(bsize)) == NULL) 393 err(1, "%s: malloc", file); 394 395 #define PASS(byte) { \ 396 memset(buf, byte, bsize); \ 397 for (len = sbp->st_size; len > 0; len -= wlen) { \ 398 wlen = len < bsize ? len : bsize; \ 399 if (write(fd, buf, wlen) != wlen) \ 400 goto err; \ 401 } \ 402 } 403 PASS(0xff); 404 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 405 goto err; 406 PASS(0x00); 407 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 408 goto err; 409 PASS(0xff); 410 if (!fsync(fd) && !close(fd)) { 411 free(buf); 412 return (1); 413 } 414 415 err: eval = 1; 416 if (buf) 417 free(buf); 418 if (fd != -1) 419 close(fd); 420 warn("%s", file); 421 return (0); 422 } 423 424 425 int 426 check(char *path, char *name, struct stat *sp) 427 { 428 int ch, first; 429 char modep[15], *flagsp; 430 431 /* Check -i first. */ 432 if (iflag) 433 (void)fprintf(stderr, "remove %s? ", path); 434 else { 435 /* 436 * If it's not a symbolic link and it's unwritable and we're 437 * talking to a terminal, ask. Symbolic links are excluded 438 * because their permissions are meaningless. Check stdin_ok 439 * first because we may not have stat'ed the file. 440 * Also skip this check if the -P option was specified because 441 * we will not be able to overwrite file contents and will 442 * barf later. 443 */ 444 if (!stdin_ok || S_ISLNK(sp->st_mode) || Pflag || 445 (!access(name, W_OK) && 446 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 447 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))) 448 return (1); 449 strmode(sp->st_mode, modep); 450 if ((flagsp = fflagstostr(sp->st_flags)) == NULL) 451 err(1, "fflagstostr"); 452 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ", 453 modep + 1, modep[9] == ' ' ? "" : " ", 454 user_from_uid(sp->st_uid, 0), 455 group_from_gid(sp->st_gid, 0), 456 *flagsp ? flagsp : "", *flagsp ? " " : "", 457 path); 458 free(flagsp); 459 } 460 (void)fflush(stderr); 461 462 first = ch = getchar(); 463 while (ch != '\n' && ch != EOF) 464 ch = getchar(); 465 return (first == 'y' || first == 'Y'); 466 } 467 468 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 469 void 470 checkdot(char **argv) 471 { 472 char *p, **save, **t; 473 int complained; 474 475 complained = 0; 476 for (t = argv; *t;) { 477 if ((p = strrchr(*t, '/')) != NULL) 478 ++p; 479 else 480 p = *t; 481 if (ISDOT(p)) { 482 if (!complained++) 483 warnx("\".\" and \"..\" may not be removed"); 484 eval = 1; 485 for (save = t; (t[0] = t[1]) != NULL; ++t) 486 continue; 487 t = save; 488 } else 489 ++t; 490 } 491 } 492 493 void 494 usage(void) 495 { 496 497 (void)fprintf(stderr, "%s\n%s\n", 498 "usage: rm [-f | -i] [-dPRrvW] file ...", 499 " unlink file"); 500 exit(EX_USAGE); 501 } 502