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/types.h> 50 #include <sys/stat.h> 51 #include <sys/param.h> 52 #include <sys/mount.h> 53 54 #include <err.h> 55 #include <errno.h> 56 #include <fcntl.h> 57 #include <fts.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <sysexits.h> 62 #include <unistd.h> 63 64 extern char *flags_to_string __P((u_long, char *)); 65 66 int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok; 67 uid_t uid; 68 69 int check __P((char *, char *, struct stat *)); 70 void checkdot __P((char **)); 71 void rm_file __P((char **)); 72 void rm_overwrite __P((char *, struct stat *)); 73 void rm_tree __P((char **)); 74 void usage __P((void)); 75 76 /* 77 * rm -- 78 * This rm is different from historic rm's, but is expected to match 79 * POSIX 1003.2 behavior. The most visible difference is that -f 80 * has two specific effects now, ignore non-existent files and force 81 * file removal. 82 */ 83 int 84 main(argc, argv) 85 int argc; 86 char *argv[]; 87 { 88 int ch, rflag; 89 char *p; 90 91 /* 92 * Test for the special case where the utility is called as 93 * "unlink", for which the functionality provided is greatly 94 * simplified. 95 */ 96 if ((p = rindex(argv[0], '/')) == NULL) 97 p = argv[0]; 98 else 99 ++p; 100 if (strcmp(p, "unlink") == 0) { 101 if (argc == 2) { 102 rm_file(&argv[1]); 103 exit(eval); 104 } else 105 usage(); 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(argv) 164 char **argv; 165 { 166 FTS *fts; 167 FTSENT *p; 168 int needstat; 169 int flags; 170 int rval; 171 172 /* 173 * Remove a file hierarchy. If forcing removal (-f), or interactive 174 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 175 */ 176 needstat = !uid || (!fflag && !iflag && stdin_ok); 177 178 /* 179 * If the -i option is specified, the user can skip on the pre-order 180 * visit. The fts_number field flags skipped directories. 181 */ 182 #define SKIPPED 1 183 184 flags = FTS_PHYSICAL; 185 if (!needstat) 186 flags |= FTS_NOSTAT; 187 if (Wflag) 188 flags |= FTS_WHITEOUT; 189 if (!(fts = fts_open(argv, flags, (int (*)())NULL))) 190 err(1, NULL); 191 while ((p = fts_read(fts)) != NULL) { 192 switch (p->fts_info) { 193 case FTS_DNR: 194 if (!fflag || p->fts_errno != ENOENT) { 195 warnx("%s: %s", 196 p->fts_path, strerror(p->fts_errno)); 197 eval = 1; 198 } 199 continue; 200 case FTS_ERR: 201 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 202 case FTS_NS: 203 /* 204 * FTS_NS: assume that if can't stat the file, it 205 * can't be unlinked. 206 */ 207 if (!needstat) 208 break; 209 if (!fflag || p->fts_errno != ENOENT) { 210 warnx("%s: %s", 211 p->fts_path, strerror(p->fts_errno)); 212 eval = 1; 213 } 214 continue; 215 case FTS_D: 216 /* Pre-order: give user chance to skip. */ 217 if (!fflag && !check(p->fts_path, p->fts_accpath, 218 p->fts_statp)) { 219 (void)fts_set(fts, p, FTS_SKIP); 220 p->fts_number = SKIPPED; 221 } 222 else if (!uid && 223 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 224 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 225 chflags(p->fts_accpath, 226 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0) 227 goto err; 228 continue; 229 case FTS_DP: 230 /* Post-order: see if user skipped. */ 231 if (p->fts_number == SKIPPED) 232 continue; 233 break; 234 default: 235 if (!fflag && 236 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 237 continue; 238 } 239 240 rval = 0; 241 if (!uid && 242 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 243 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE))) 244 rval = chflags(p->fts_accpath, 245 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); 246 if (rval == 0) { 247 /* 248 * If we can't read or search the directory, may still be 249 * able to remove it. Don't print out the un{read,search}able 250 * message unless the remove fails. 251 */ 252 switch (p->fts_info) { 253 case FTS_DP: 254 case FTS_DNR: 255 rval = rmdir(p->fts_accpath); 256 if (rval == 0 || (fflag && errno == ENOENT)) { 257 if (rval == 0 && vflag) 258 (void)printf("%s\n", 259 p->fts_accpath); 260 continue; 261 } 262 break; 263 264 case FTS_W: 265 rval = undelete(p->fts_accpath); 266 if (rval == 0 && (fflag && errno == ENOENT)) { 267 if (vflag) 268 (void)printf("%s\n", 269 p->fts_accpath); 270 continue; 271 } 272 break; 273 274 default: 275 if (Pflag) 276 rm_overwrite(p->fts_accpath, NULL); 277 rval = unlink(p->fts_accpath); 278 if (rval == 0 || (fflag && errno == ENOENT)) { 279 if (rval == 0 && vflag) 280 (void)printf("%s\n", 281 p->fts_accpath); 282 continue; 283 } 284 } 285 } 286 err: 287 warn("%s", p->fts_path); 288 eval = 1; 289 } 290 if (errno) 291 err(1, "fts_read"); 292 } 293 294 void 295 rm_file(argv) 296 char **argv; 297 { 298 struct stat sb; 299 int rval; 300 char *f; 301 302 /* 303 * Remove a file. POSIX 1003.2 states that, by default, attempting 304 * to remove a directory is an error, so must always stat the file. 305 */ 306 while ((f = *argv++) != NULL) { 307 /* Assume if can't stat the file, can't unlink it. */ 308 if (lstat(f, &sb)) { 309 if (Wflag) { 310 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 311 } else { 312 if (!fflag || errno != ENOENT) { 313 warn("%s", f); 314 eval = 1; 315 } 316 continue; 317 } 318 } else if (Wflag) { 319 warnx("%s: %s", f, strerror(EEXIST)); 320 eval = 1; 321 continue; 322 } 323 324 if (S_ISDIR(sb.st_mode) && !dflag) { 325 warnx("%s: is a directory", f); 326 eval = 1; 327 continue; 328 } 329 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 330 continue; 331 rval = 0; 332 if (!uid && 333 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) && 334 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE))) 335 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE)); 336 if (rval == 0) { 337 if (S_ISWHT(sb.st_mode)) 338 rval = undelete(f); 339 else if (S_ISDIR(sb.st_mode)) 340 rval = rmdir(f); 341 else { 342 if (Pflag) 343 rm_overwrite(f, &sb); 344 rval = unlink(f); 345 } 346 } 347 if (rval && (!fflag || errno != ENOENT)) { 348 warn("%s", f); 349 eval = 1; 350 } 351 if (vflag && rval == 0) 352 (void)printf("%s\n", f); 353 } 354 } 355 356 /* 357 * rm_overwrite -- 358 * Overwrite the file 3 times with varying bit patterns. 359 * 360 * XXX 361 * This is a cheap way to *really* delete files. Note that only regular 362 * files are deleted, directories (and therefore names) will remain. 363 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 364 * System V file system). In a logging file system, you'll have to have 365 * kernel support. 366 */ 367 void 368 rm_overwrite(file, sbp) 369 char *file; 370 struct stat *sbp; 371 { 372 struct stat sb; 373 struct statfs fsb; 374 off_t len; 375 int bsize, fd, wlen; 376 char *buf = NULL; 377 378 fd = -1; 379 if (sbp == NULL) { 380 if (lstat(file, &sb)) 381 goto err; 382 sbp = &sb; 383 } 384 if (!S_ISREG(sbp->st_mode)) 385 return; 386 if ((fd = open(file, O_WRONLY, 0)) == -1) 387 goto err; 388 if (fstatfs(fd, &fsb) == -1) 389 goto err; 390 bsize = MAX(fsb.f_iosize, 1024); 391 if ((buf = malloc(bsize)) == NULL) 392 err(1, "malloc"); 393 394 #define PASS(byte) { \ 395 memset(buf, byte, bsize); \ 396 for (len = sbp->st_size; len > 0; len -= wlen) { \ 397 wlen = len < bsize ? len : bsize; \ 398 if (write(fd, buf, wlen) != wlen) \ 399 goto err; \ 400 } \ 401 } 402 PASS(0xff); 403 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 404 goto err; 405 PASS(0x00); 406 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 407 goto err; 408 PASS(0xff); 409 if (!fsync(fd) && !close(fd)) { 410 free(buf); 411 return; 412 } 413 414 err: eval = 1; 415 if (buf) 416 free(buf); 417 warn("%s", file); 418 } 419 420 421 int 422 check(path, name, sp) 423 char *path, *name; 424 struct stat *sp; 425 { 426 int ch, first; 427 char modep[15], flagsp[128]; 428 429 /* Check -i first. */ 430 if (iflag) 431 (void)fprintf(stderr, "remove %s? ", path); 432 else { 433 /* 434 * If it's not a symbolic link and it's unwritable and we're 435 * talking to a terminal, ask. Symbolic links are excluded 436 * because their permissions are meaningless. Check stdin_ok 437 * first because we may not have stat'ed the file. 438 */ 439 if (!stdin_ok || S_ISLNK(sp->st_mode) || 440 (!access(name, W_OK) && 441 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 442 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))) 443 return (1); 444 strmode(sp->st_mode, modep); 445 strcpy(flagsp, flags_to_string(sp->st_flags, NULL)); 446 if (*flagsp) 447 strcat(flagsp, " "); 448 (void)fprintf(stderr, "override %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 : "", 453 path); 454 } 455 (void)fflush(stderr); 456 457 first = ch = getchar(); 458 while (ch != '\n' && ch != EOF) 459 ch = getchar(); 460 return (first == 'y' || first == 'Y'); 461 } 462 463 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 464 void 465 checkdot(argv) 466 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() 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