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