1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993, 1994 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 #if 0 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1990, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94"; 41 #endif /* not lint */ 42 #endif 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/stat.h> 47 #include <sys/param.h> 48 #include <sys/mount.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 <stdint.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <sysexits.h> 62 #include <unistd.h> 63 64 static int dflag, eval, fflag, iflag, vflag, Wflag, stdin_ok; 65 static int rflag, Iflag, xflag; 66 static uid_t uid; 67 static volatile sig_atomic_t info; 68 69 static int check(const char *, const char *, struct stat *); 70 static int check2(char **); 71 static void checkdot(char **); 72 static void checkslash(char **); 73 static void rm_file(char **); 74 static void rm_tree(char **); 75 static void siginfo(int __unused); 76 static void usage(void); 77 78 /* 79 * rm -- 80 * This rm is different from historic rm's, but is expected to match 81 * POSIX 1003.2 behavior. The most visible difference is that -f 82 * has two specific effects now, ignore non-existent files and force 83 * file removal. 84 */ 85 int 86 main(int argc, char *argv[]) 87 { 88 int ch; 89 char *p; 90 91 (void)setlocale(LC_ALL, ""); 92 93 /* 94 * Test for the special case where the utility is called as 95 * "unlink", for which the functionality provided is greatly 96 * simplified. 97 */ 98 if ((p = strrchr(argv[0], '/')) == NULL) 99 p = argv[0]; 100 else 101 ++p; 102 if (strcmp(p, "unlink") == 0) { 103 if (argc == 2) 104 rm_file(&argv[1]); 105 else if (argc == 3 && strcmp(argv[1], "--") == 0) 106 rm_file(&argv[2]); 107 else 108 usage(); 109 exit(eval); 110 } 111 112 rflag = xflag = 0; 113 while ((ch = getopt(argc, argv, "dfiIPRrvWx")) != -1) 114 switch(ch) { 115 case 'd': 116 dflag = 1; 117 break; 118 case 'f': 119 fflag = 1; 120 iflag = 0; 121 break; 122 case 'i': 123 fflag = 0; 124 iflag = 1; 125 break; 126 case 'I': 127 Iflag = 1; 128 break; 129 case 'P': 130 /* Compatibility no-op. */ 131 break; 132 case 'R': 133 case 'r': /* Compatibility. */ 134 rflag = 1; 135 break; 136 case 'v': 137 vflag = 1; 138 break; 139 case 'W': 140 Wflag = 1; 141 break; 142 case 'x': 143 xflag = 1; 144 break; 145 default: 146 usage(); 147 } 148 argc -= optind; 149 argv += optind; 150 151 if (argc < 1) { 152 if (fflag) 153 return (0); 154 usage(); 155 } 156 157 checkdot(argv); 158 checkslash(argv); 159 uid = geteuid(); 160 161 (void)signal(SIGINFO, siginfo); 162 if (*argv) { 163 stdin_ok = isatty(STDIN_FILENO); 164 165 if (Iflag) { 166 if (check2(argv) == 0) 167 exit (1); 168 } 169 if (rflag) 170 rm_tree(argv); 171 else 172 rm_file(argv); 173 } 174 175 exit (eval); 176 } 177 178 static void 179 rm_tree(char **argv) 180 { 181 FTS *fts; 182 FTSENT *p; 183 int needstat; 184 int flags; 185 int rval; 186 187 /* 188 * Remove a file hierarchy. If forcing removal (-f), or interactive 189 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 190 */ 191 needstat = !uid || (!fflag && !iflag && stdin_ok); 192 193 /* 194 * If the -i option is specified, the user can skip on the pre-order 195 * visit. The fts_number field flags skipped directories. 196 */ 197 #define SKIPPED 1 198 199 flags = FTS_PHYSICAL; 200 if (!needstat) 201 flags |= FTS_NOSTAT; 202 if (Wflag) 203 flags |= FTS_WHITEOUT; 204 if (xflag) 205 flags |= FTS_XDEV; 206 if (!(fts = fts_open(argv, flags, NULL))) { 207 if (fflag && errno == ENOENT) 208 return; 209 err(1, "fts_open"); 210 } 211 while ((p = fts_read(fts)) != NULL) { 212 switch (p->fts_info) { 213 case FTS_DNR: 214 if (!fflag || p->fts_errno != ENOENT) { 215 warnx("%s: %s", 216 p->fts_path, strerror(p->fts_errno)); 217 eval = 1; 218 } 219 continue; 220 case FTS_ERR: 221 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 222 case FTS_NS: 223 /* 224 * Assume that since fts_read() couldn't stat the 225 * file, it can't be unlinked. 226 */ 227 if (!needstat) 228 break; 229 if (!fflag || p->fts_errno != ENOENT) { 230 warnx("%s: %s", 231 p->fts_path, strerror(p->fts_errno)); 232 eval = 1; 233 } 234 continue; 235 case FTS_D: 236 /* Pre-order: give user chance to skip. */ 237 if (!fflag && !check(p->fts_path, p->fts_accpath, 238 p->fts_statp)) { 239 (void)fts_set(fts, p, FTS_SKIP); 240 p->fts_number = SKIPPED; 241 } 242 else if (!uid && 243 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 244 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 245 lchflags(p->fts_accpath, 246 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0) 247 goto err; 248 continue; 249 case FTS_DP: 250 /* Post-order: see if user skipped. */ 251 if (p->fts_number == SKIPPED) 252 continue; 253 break; 254 default: 255 if (!fflag && 256 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 257 continue; 258 } 259 260 rval = 0; 261 if (!uid && 262 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 263 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE))) 264 rval = lchflags(p->fts_accpath, 265 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); 266 if (rval == 0) { 267 /* 268 * If we can't read or search the directory, may still be 269 * able to remove it. Don't print out the un{read,search}able 270 * message unless the remove fails. 271 */ 272 switch (p->fts_info) { 273 case FTS_DP: 274 case FTS_DNR: 275 rval = rmdir(p->fts_accpath); 276 if (rval == 0 || (fflag && errno == ENOENT)) { 277 if (rval == 0 && vflag) 278 (void)printf("%s\n", 279 p->fts_path); 280 if (rval == 0 && info) { 281 info = 0; 282 (void)printf("%s\n", 283 p->fts_path); 284 } 285 continue; 286 } 287 break; 288 289 case FTS_W: 290 rval = undelete(p->fts_accpath); 291 if (rval == 0 && (fflag && errno == ENOENT)) { 292 if (vflag) 293 (void)printf("%s\n", 294 p->fts_path); 295 if (info) { 296 info = 0; 297 (void)printf("%s\n", 298 p->fts_path); 299 } 300 continue; 301 } 302 break; 303 304 case FTS_NS: 305 /* 306 * Assume that since fts_read() couldn't stat 307 * the file, it can't be unlinked. 308 */ 309 if (fflag) 310 continue; 311 /* FALLTHROUGH */ 312 313 case FTS_F: 314 case FTS_NSOK: 315 default: 316 rval = unlink(p->fts_accpath); 317 if (rval == 0 || (fflag && errno == ENOENT)) { 318 if (rval == 0 && vflag) 319 (void)printf("%s\n", 320 p->fts_path); 321 if (rval == 0 && info) { 322 info = 0; 323 (void)printf("%s\n", 324 p->fts_path); 325 } 326 continue; 327 } 328 } 329 } 330 err: 331 warn("%s", p->fts_path); 332 eval = 1; 333 } 334 if (!fflag && errno) 335 err(1, "fts_read"); 336 fts_close(fts); 337 } 338 339 static void 340 rm_file(char **argv) 341 { 342 struct stat sb; 343 int rval; 344 char *f; 345 346 /* 347 * Remove a file. POSIX 1003.2 states that, by default, attempting 348 * to remove a directory is an error, so must always stat the file. 349 */ 350 while ((f = *argv++) != NULL) { 351 /* Assume if can't stat the file, can't unlink it. */ 352 if (lstat(f, &sb)) { 353 if (Wflag) { 354 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 355 } else { 356 if (!fflag || errno != ENOENT) { 357 warn("%s", f); 358 eval = 1; 359 } 360 continue; 361 } 362 } else if (Wflag) { 363 warnx("%s: %s", f, strerror(EEXIST)); 364 eval = 1; 365 continue; 366 } 367 368 if (S_ISDIR(sb.st_mode) && !dflag) { 369 warnx("%s: is a directory", f); 370 eval = 1; 371 continue; 372 } 373 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 374 continue; 375 rval = 0; 376 if (!uid && !S_ISWHT(sb.st_mode) && 377 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) && 378 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE))) 379 rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE)); 380 if (rval == 0) { 381 if (S_ISWHT(sb.st_mode)) 382 rval = undelete(f); 383 else if (S_ISDIR(sb.st_mode)) 384 rval = rmdir(f); 385 else 386 rval = unlink(f); 387 } 388 if (rval && (!fflag || errno != ENOENT)) { 389 warn("%s", f); 390 eval = 1; 391 } 392 if (vflag && rval == 0) 393 (void)printf("%s\n", f); 394 if (info && rval == 0) { 395 info = 0; 396 (void)printf("%s\n", f); 397 } 398 } 399 } 400 401 static int 402 check(const char *path, const char *name, struct stat *sp) 403 { 404 int ch, first; 405 char modep[15], *flagsp; 406 407 /* Check -i first. */ 408 if (iflag) 409 (void)fprintf(stderr, "remove %s? ", path); 410 else { 411 /* 412 * If it's not a symbolic link and it's unwritable and we're 413 * talking to a terminal, ask. Symbolic links are excluded 414 * because their permissions are meaningless. Check stdin_ok 415 * first because we may not have stat'ed the file. 416 */ 417 if (!stdin_ok || S_ISLNK(sp->st_mode) || 418 (!access(name, W_OK) && 419 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 420 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))) 421 return (1); 422 strmode(sp->st_mode, modep); 423 if ((flagsp = fflagstostr(sp->st_flags)) == NULL) 424 err(1, "fflagstostr"); 425 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ", 426 modep + 1, modep[10] == ' ' ? "" : " ", 427 user_from_uid(sp->st_uid, 0), 428 group_from_gid(sp->st_gid, 0), 429 *flagsp ? flagsp : "", *flagsp ? " " : "", 430 path); 431 free(flagsp); 432 } 433 (void)fflush(stderr); 434 435 first = ch = getchar(); 436 while (ch != '\n' && ch != EOF) 437 ch = getchar(); 438 return (first == 'y' || first == 'Y'); 439 } 440 441 #define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0') 442 static void 443 checkslash(char **argv) 444 { 445 char **t, **u; 446 int complained; 447 448 complained = 0; 449 for (t = argv; *t;) { 450 if (ISSLASH(*t)) { 451 if (!complained++) 452 warnx("\"/\" may not be removed"); 453 eval = 1; 454 for (u = t; u[0] != NULL; ++u) 455 u[0] = u[1]; 456 } else { 457 ++t; 458 } 459 } 460 } 461 462 static int 463 check2(char **argv) 464 { 465 struct stat st; 466 int first; 467 int ch; 468 int fcount = 0; 469 int dcount = 0; 470 int i; 471 const char *dname = NULL; 472 473 for (i = 0; argv[i]; ++i) { 474 if (lstat(argv[i], &st) == 0) { 475 if (S_ISDIR(st.st_mode)) { 476 ++dcount; 477 dname = argv[i]; /* only used if 1 dir */ 478 } else { 479 ++fcount; 480 } 481 } 482 } 483 first = 0; 484 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') { 485 if (dcount && rflag) { 486 fprintf(stderr, "recursively remove"); 487 if (dcount == 1) 488 fprintf(stderr, " %s", dname); 489 else 490 fprintf(stderr, " %d dirs", dcount); 491 if (fcount == 1) 492 fprintf(stderr, " and 1 file"); 493 else if (fcount > 1) 494 fprintf(stderr, " and %d files", fcount); 495 } else if (dcount + fcount > 3) { 496 fprintf(stderr, "remove %d files", dcount + fcount); 497 } else { 498 return(1); 499 } 500 fprintf(stderr, "? "); 501 fflush(stderr); 502 503 first = ch = getchar(); 504 while (ch != '\n' && ch != EOF) 505 ch = getchar(); 506 if (ch == EOF) 507 break; 508 } 509 return (first == 'y' || first == 'Y'); 510 } 511 512 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 513 static void 514 checkdot(char **argv) 515 { 516 char *p, **save, **t; 517 int complained; 518 519 complained = 0; 520 for (t = argv; *t;) { 521 if ((p = strrchr(*t, '/')) != NULL) 522 ++p; 523 else 524 p = *t; 525 if (ISDOT(p)) { 526 if (!complained++) 527 warnx("\".\" and \"..\" may not be removed"); 528 eval = 1; 529 for (save = t; (t[0] = t[1]) != NULL; ++t) 530 continue; 531 t = save; 532 } else 533 ++t; 534 } 535 } 536 537 static void 538 usage(void) 539 { 540 541 (void)fprintf(stderr, "%s\n%s\n", 542 "usage: rm [-f | -i] [-dIPRrvWx] file ...", 543 " unlink [--] file"); 544 exit(EX_USAGE); 545 } 546 547 static void 548 siginfo(int sig __unused) 549 { 550 551 info = 1; 552 } 553