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