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