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 #endif 40 #include <sys/cdefs.h> 41 #include <sys/stat.h> 42 #include <sys/param.h> 43 #include <sys/mount.h> 44 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <fts.h> 49 #include <grp.h> 50 #include <locale.h> 51 #include <pwd.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <sysexits.h> 56 #include <unistd.h> 57 58 static int dflag, eval, fflag, iflag, vflag, Wflag, stdin_ok; 59 static int rflag, Iflag, xflag; 60 static uid_t uid; 61 static volatile sig_atomic_t info; 62 63 static int check(const char *, const char *, struct stat *); 64 static int check2(char **); 65 static void checkdot(char **); 66 static void checkslash(char **); 67 static void rm_file(char **); 68 static void rm_tree(char **); 69 static void siginfo(int __unused); 70 static void usage(void); 71 72 /* 73 * rm -- 74 * This rm is different from historic rm's, but is expected to match 75 * POSIX 1003.2 behavior. The most visible difference is that -f 76 * has two specific effects now, ignore non-existent files and force 77 * file removal. 78 */ 79 int 80 main(int argc, char *argv[]) 81 { 82 int ch; 83 char *p; 84 85 (void)setlocale(LC_ALL, ""); 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 = strrchr(argv[0], '/')) == NULL) 93 p = argv[0]; 94 else 95 ++p; 96 if (strcmp(p, "unlink") == 0) { 97 if (argc == 2) 98 rm_file(&argv[1]); 99 else if (argc == 3 && strcmp(argv[1], "--") == 0) 100 rm_file(&argv[2]); 101 else 102 usage(); 103 exit(eval); 104 } 105 106 rflag = xflag = 0; 107 while ((ch = getopt(argc, argv, "dfiIPRrvWx")) != -1) 108 switch(ch) { 109 case 'd': 110 dflag = 1; 111 break; 112 case 'f': 113 fflag = 1; 114 iflag = 0; 115 break; 116 case 'i': 117 fflag = 0; 118 iflag = 1; 119 break; 120 case 'I': 121 Iflag = 1; 122 break; 123 case 'P': 124 /* Compatibility no-op. */ 125 break; 126 case 'R': 127 case 'r': /* Compatibility. */ 128 rflag = 1; 129 break; 130 case 'v': 131 vflag = 1; 132 break; 133 case 'W': 134 Wflag = 1; 135 break; 136 case 'x': 137 xflag = 1; 138 break; 139 default: 140 usage(); 141 } 142 argc -= optind; 143 argv += optind; 144 145 if (argc < 1) { 146 if (fflag) 147 return (0); 148 usage(); 149 } 150 151 checkdot(argv); 152 checkslash(argv); 153 uid = geteuid(); 154 155 (void)signal(SIGINFO, siginfo); 156 if (*argv) { 157 stdin_ok = isatty(STDIN_FILENO); 158 159 if (Iflag) { 160 if (check2(argv) == 0) 161 exit (1); 162 } 163 if (rflag) 164 rm_tree(argv); 165 else 166 rm_file(argv); 167 } 168 169 exit (eval); 170 } 171 172 static void 173 rm_tree(char **argv) 174 { 175 FTS *fts; 176 FTSENT *p; 177 int needstat; 178 int flags; 179 int rval; 180 181 /* 182 * Remove a file hierarchy. If forcing removal (-f), or interactive 183 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 184 */ 185 needstat = !uid || (!fflag && !iflag && stdin_ok); 186 187 /* 188 * If the -i option is specified, the user can skip on the pre-order 189 * visit. The fts_number field flags skipped directories. 190 */ 191 #define SKIPPED 1 192 193 flags = FTS_PHYSICAL; 194 if (!needstat) 195 flags |= FTS_NOSTAT; 196 if (Wflag) 197 flags |= FTS_WHITEOUT; 198 if (xflag) 199 flags |= FTS_XDEV; 200 if (!(fts = fts_open(argv, flags, NULL))) { 201 if (fflag && errno == ENOENT) 202 return; 203 err(1, "fts_open"); 204 } 205 while (errno = 0, (p = fts_read(fts)) != NULL) { 206 switch (p->fts_info) { 207 case FTS_DNR: 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_ERR: 215 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 216 case FTS_NS: 217 /* 218 * Assume that since fts_read() couldn't stat the 219 * file, it can't be unlinked. 220 */ 221 if (!needstat) 222 break; 223 if (!fflag || p->fts_errno != ENOENT) { 224 warnx("%s: %s", 225 p->fts_path, strerror(p->fts_errno)); 226 eval = 1; 227 } 228 continue; 229 case FTS_D: 230 /* Pre-order: give user chance to skip. */ 231 if (!fflag && !check(p->fts_path, p->fts_accpath, 232 p->fts_statp)) { 233 (void)fts_set(fts, p, FTS_SKIP); 234 p->fts_number = SKIPPED; 235 } 236 else if (!uid && 237 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 238 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 239 lchflags(p->fts_accpath, 240 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0) 241 goto err; 242 continue; 243 case FTS_DP: 244 /* Post-order: see if user skipped. */ 245 if (p->fts_number == SKIPPED) 246 continue; 247 break; 248 default: 249 if (!fflag && 250 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 251 continue; 252 } 253 254 rval = 0; 255 if (!uid && 256 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 257 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE))) 258 rval = lchflags(p->fts_accpath, 259 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); 260 if (rval == 0) { 261 /* 262 * If we can't read or search the directory, may still be 263 * able to remove it. Don't print out the un{read,search}able 264 * message unless the remove fails. 265 */ 266 switch (p->fts_info) { 267 case FTS_DP: 268 case FTS_DNR: 269 rval = rmdir(p->fts_accpath); 270 if (rval == 0 || (fflag && errno == ENOENT)) { 271 if (rval == 0 && vflag) 272 (void)printf("%s\n", 273 p->fts_path); 274 if (rval == 0 && info) { 275 info = 0; 276 (void)printf("%s\n", 277 p->fts_path); 278 } 279 continue; 280 } 281 break; 282 283 case FTS_W: 284 rval = undelete(p->fts_accpath); 285 if (rval == 0 && (fflag && errno == ENOENT)) { 286 if (vflag) 287 (void)printf("%s\n", 288 p->fts_path); 289 if (info) { 290 info = 0; 291 (void)printf("%s\n", 292 p->fts_path); 293 } 294 continue; 295 } 296 break; 297 298 case FTS_NS: 299 /* 300 * Assume that since fts_read() couldn't stat 301 * the file, it can't be unlinked. 302 */ 303 if (fflag) 304 continue; 305 /* FALLTHROUGH */ 306 307 case FTS_F: 308 case FTS_NSOK: 309 default: 310 rval = unlink(p->fts_accpath); 311 if (rval == 0 || (fflag && errno == ENOENT)) { 312 if (rval == 0 && vflag) 313 (void)printf("%s\n", 314 p->fts_path); 315 if (rval == 0 && info) { 316 info = 0; 317 (void)printf("%s\n", 318 p->fts_path); 319 } 320 continue; 321 } 322 } 323 } 324 err: 325 warn("%s", p->fts_path); 326 eval = 1; 327 } 328 if (!fflag && errno) 329 err(1, "fts_read"); 330 fts_close(fts); 331 } 332 333 static void 334 rm_file(char **argv) 335 { 336 struct stat sb; 337 int rval; 338 char *f; 339 340 /* 341 * Remove a file. POSIX 1003.2 states that, by default, attempting 342 * to remove a directory is an error, so must always stat the file. 343 */ 344 while ((f = *argv++) != NULL) { 345 /* Assume if can't stat the file, can't unlink it. */ 346 if (lstat(f, &sb)) { 347 if (Wflag) { 348 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 349 } else { 350 if (!fflag || errno != ENOENT) { 351 warn("%s", f); 352 eval = 1; 353 } 354 continue; 355 } 356 } else if (Wflag) { 357 warnx("%s: %s", f, strerror(EEXIST)); 358 eval = 1; 359 continue; 360 } 361 362 if (S_ISDIR(sb.st_mode) && !dflag) { 363 warnx("%s: is a directory", f); 364 eval = 1; 365 continue; 366 } 367 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 368 continue; 369 rval = 0; 370 if (!uid && !S_ISWHT(sb.st_mode) && 371 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) && 372 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE))) 373 rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE)); 374 if (rval == 0) { 375 if (S_ISWHT(sb.st_mode)) 376 rval = undelete(f); 377 else if (S_ISDIR(sb.st_mode)) 378 rval = rmdir(f); 379 else 380 rval = unlink(f); 381 } 382 if (rval && (!fflag || errno != ENOENT)) { 383 warn("%s", f); 384 eval = 1; 385 } 386 if (vflag && rval == 0) 387 (void)printf("%s\n", f); 388 if (info && rval == 0) { 389 info = 0; 390 (void)printf("%s\n", f); 391 } 392 } 393 } 394 395 static int 396 check(const char *path, const char *name, struct stat *sp) 397 { 398 int ch, first; 399 char modep[15], *flagsp; 400 401 /* Check -i first. */ 402 if (iflag) 403 (void)fprintf(stderr, "remove %s? ", path); 404 else { 405 /* 406 * If it's not a symbolic link and it's unwritable and we're 407 * talking to a terminal, ask. Symbolic links are excluded 408 * because their permissions are meaningless. Check stdin_ok 409 * first because we may not have stat'ed the file. 410 */ 411 if (!stdin_ok || S_ISLNK(sp->st_mode) || 412 (!access(name, W_OK) && 413 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 414 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))) 415 return (1); 416 strmode(sp->st_mode, modep); 417 if ((flagsp = fflagstostr(sp->st_flags)) == NULL) 418 err(1, "fflagstostr"); 419 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ", 420 modep + 1, modep[10] == ' ' ? "" : " ", 421 user_from_uid(sp->st_uid, 0), 422 group_from_gid(sp->st_gid, 0), 423 *flagsp ? flagsp : "", *flagsp ? " " : "", 424 path); 425 free(flagsp); 426 } 427 (void)fflush(stderr); 428 429 first = ch = getchar(); 430 while (ch != '\n' && ch != EOF) 431 ch = getchar(); 432 return (first == 'y' || first == 'Y'); 433 } 434 435 #define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0') 436 static void 437 checkslash(char **argv) 438 { 439 char **t, **u; 440 int complained; 441 442 complained = 0; 443 for (t = argv; *t;) { 444 if (ISSLASH(*t)) { 445 if (!complained++) 446 warnx("\"/\" may not be removed"); 447 eval = 1; 448 for (u = t; u[0] != NULL; ++u) 449 u[0] = u[1]; 450 } else { 451 ++t; 452 } 453 } 454 } 455 456 static int 457 check2(char **argv) 458 { 459 struct stat st; 460 int first; 461 int ch; 462 int fcount = 0; 463 int dcount = 0; 464 int i; 465 const char *dname = NULL; 466 467 for (i = 0; argv[i]; ++i) { 468 if (lstat(argv[i], &st) == 0) { 469 if (S_ISDIR(st.st_mode)) { 470 ++dcount; 471 dname = argv[i]; /* only used if 1 dir */ 472 } else { 473 ++fcount; 474 } 475 } 476 } 477 first = 0; 478 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') { 479 if (dcount && rflag) { 480 fprintf(stderr, "recursively remove"); 481 if (dcount == 1) 482 fprintf(stderr, " %s", dname); 483 else 484 fprintf(stderr, " %d dirs", dcount); 485 if (fcount == 1) 486 fprintf(stderr, " and 1 file"); 487 else if (fcount > 1) 488 fprintf(stderr, " and %d files", fcount); 489 } else if (dcount + fcount > 3) { 490 fprintf(stderr, "remove %d files", dcount + fcount); 491 } else { 492 return(1); 493 } 494 fprintf(stderr, "? "); 495 fflush(stderr); 496 497 first = ch = getchar(); 498 while (ch != '\n' && ch != EOF) 499 ch = getchar(); 500 if (ch == EOF) 501 break; 502 } 503 return (first == 'y' || first == 'Y'); 504 } 505 506 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 507 static void 508 checkdot(char **argv) 509 { 510 char *p, **save, **t; 511 int complained; 512 513 complained = 0; 514 for (t = argv; *t;) { 515 if ((p = strrchr(*t, '/')) != NULL) 516 ++p; 517 else 518 p = *t; 519 if (ISDOT(p)) { 520 if (!complained++) 521 warnx("\".\" and \"..\" may not be removed"); 522 eval = 1; 523 for (save = t; (t[0] = t[1]) != NULL; ++t) 524 continue; 525 t = save; 526 } else 527 ++t; 528 } 529 } 530 531 static void 532 usage(void) 533 { 534 535 (void)fprintf(stderr, "%s\n%s\n", 536 "usage: rm [-f | -i] [-dIPRrvWx] file ...", 537 " unlink [--] file"); 538 exit(EX_USAGE); 539 } 540 541 static void 542 siginfo(int sig __unused) 543 { 544 545 info = 1; 546 } 547