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 #include <sys/stat.h> 33 #include <sys/param.h> 34 #include <sys/mount.h> 35 36 #include <err.h> 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <fts.h> 40 #include <grp.h> 41 #include <locale.h> 42 #include <pwd.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <sysexits.h> 47 #include <unistd.h> 48 49 static int dflag, eval, fflag, iflag, vflag, Wflag, stdin_ok; 50 static int rflag, Iflag, xflag; 51 static uid_t uid; 52 static volatile sig_atomic_t info; 53 54 static int check(const char *, const char *, struct stat *); 55 static int check2(char **); 56 static void checkdot(char **); 57 static void checkslash(char **); 58 static void rm_file(char **); 59 static void rm_tree(char **); 60 static void siginfo(int __unused); 61 static void usage(void); 62 63 /* 64 * rm -- 65 * This rm is different from historic rm's, but is expected to match 66 * POSIX 1003.2 behavior. The most visible difference is that -f 67 * has two specific effects now, ignore non-existent files and force 68 * file removal. 69 */ 70 int 71 main(int argc, char *argv[]) 72 { 73 int ch; 74 char *p; 75 76 (void)setlocale(LC_ALL, ""); 77 78 /* 79 * Test for the special case where the utility is called as 80 * "unlink", for which the functionality provided is greatly 81 * simplified. 82 */ 83 if ((p = strrchr(argv[0], '/')) == NULL) 84 p = argv[0]; 85 else 86 ++p; 87 if (strcmp(p, "unlink") == 0) { 88 if (argc == 2) 89 rm_file(&argv[1]); 90 else if (argc == 3 && strcmp(argv[1], "--") == 0) 91 rm_file(&argv[2]); 92 else 93 usage(); 94 exit(eval); 95 } 96 97 rflag = xflag = 0; 98 while ((ch = getopt(argc, argv, "dfiIPRrvWx")) != -1) 99 switch(ch) { 100 case 'd': 101 dflag = 1; 102 break; 103 case 'f': 104 fflag = 1; 105 iflag = 0; 106 break; 107 case 'i': 108 fflag = 0; 109 iflag = 1; 110 break; 111 case 'I': 112 Iflag = 1; 113 break; 114 case 'P': 115 /* Compatibility no-op. */ 116 break; 117 case 'R': 118 case 'r': /* Compatibility. */ 119 rflag = 1; 120 break; 121 case 'v': 122 vflag = 1; 123 break; 124 case 'W': 125 Wflag = 1; 126 break; 127 case 'x': 128 xflag = 1; 129 break; 130 default: 131 usage(); 132 } 133 argc -= optind; 134 argv += optind; 135 136 if (argc < 1) { 137 if (fflag) 138 return (0); 139 usage(); 140 } 141 142 checkdot(argv); 143 checkslash(argv); 144 uid = geteuid(); 145 146 (void)signal(SIGINFO, siginfo); 147 if (*argv) { 148 stdin_ok = isatty(STDIN_FILENO); 149 150 if (Iflag) { 151 if (check2(argv) == 0) 152 exit (1); 153 } 154 if (rflag) 155 rm_tree(argv); 156 else 157 rm_file(argv); 158 } 159 160 exit (eval); 161 } 162 163 static void 164 rm_tree(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 (xflag) 190 flags |= FTS_XDEV; 191 if (!(fts = fts_open(argv, flags, NULL))) { 192 if (fflag && errno == ENOENT) 193 return; 194 err(1, "fts_open"); 195 } 196 while (errno = 0, (p = fts_read(fts)) != NULL) { 197 switch (p->fts_info) { 198 case FTS_DNR: 199 if (!fflag || p->fts_errno != ENOENT) { 200 warnx("%s: %s", 201 p->fts_path, strerror(p->fts_errno)); 202 eval = 1; 203 } 204 continue; 205 case FTS_ERR: 206 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 207 case FTS_NS: 208 /* 209 * Assume that since fts_read() couldn't stat the 210 * file, it can't be unlinked. 211 */ 212 if (!needstat) 213 break; 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_D: 221 /* Pre-order: give user chance to skip. */ 222 if (!fflag && !check(p->fts_path, p->fts_accpath, 223 p->fts_statp)) { 224 (void)fts_set(fts, p, FTS_SKIP); 225 p->fts_number = SKIPPED; 226 } 227 else if (!uid && 228 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 229 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 230 lchflags(p->fts_accpath, 231 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0) 232 goto err; 233 continue; 234 case FTS_DP: 235 /* Post-order: see if user skipped. */ 236 if (p->fts_number == SKIPPED) 237 continue; 238 break; 239 default: 240 if (!fflag && 241 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 242 continue; 243 } 244 245 rval = 0; 246 if (!uid && 247 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 248 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE))) 249 rval = lchflags(p->fts_accpath, 250 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); 251 if (rval == 0) { 252 /* 253 * If we can't read or search the directory, may still be 254 * able to remove it. Don't print out the un{read,search}able 255 * message unless the remove fails. 256 */ 257 switch (p->fts_info) { 258 case FTS_DP: 259 case FTS_DNR: 260 rval = rmdir(p->fts_accpath); 261 if (rval == 0 || (fflag && errno == ENOENT)) { 262 if (rval == 0 && vflag) 263 (void)printf("%s\n", 264 p->fts_path); 265 if (rval == 0 && info) { 266 info = 0; 267 (void)printf("%s\n", 268 p->fts_path); 269 } 270 continue; 271 } 272 break; 273 274 case FTS_W: 275 rval = undelete(p->fts_accpath); 276 if (rval == 0 && (fflag && errno == ENOENT)) { 277 if (vflag) 278 (void)printf("%s\n", 279 p->fts_path); 280 if (info) { 281 info = 0; 282 (void)printf("%s\n", 283 p->fts_path); 284 } 285 continue; 286 } 287 break; 288 289 case FTS_NS: 290 /* 291 * Assume that since fts_read() couldn't stat 292 * the file, it can't be unlinked. 293 */ 294 if (fflag) 295 continue; 296 /* FALLTHROUGH */ 297 298 case FTS_F: 299 case FTS_NSOK: 300 default: 301 rval = unlink(p->fts_accpath); 302 if (rval == 0 || (fflag && errno == ENOENT)) { 303 if (rval == 0 && vflag) 304 (void)printf("%s\n", 305 p->fts_path); 306 if (rval == 0 && info) { 307 info = 0; 308 (void)printf("%s\n", 309 p->fts_path); 310 } 311 continue; 312 } 313 } 314 } 315 err: 316 warn("%s", p->fts_path); 317 eval = 1; 318 } 319 if (!fflag && errno) 320 err(1, "fts_read"); 321 fts_close(fts); 322 } 323 324 static void 325 rm_file(char **argv) 326 { 327 struct stat sb; 328 int rval; 329 char *f; 330 331 /* 332 * Remove a file. POSIX 1003.2 states that, by default, attempting 333 * to remove a directory is an error, so must always stat the file. 334 */ 335 while ((f = *argv++) != NULL) { 336 /* Assume if can't stat the file, can't unlink it. */ 337 if (lstat(f, &sb)) { 338 if (Wflag) { 339 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 340 } else { 341 if (!fflag || errno != ENOENT) { 342 warn("%s", f); 343 eval = 1; 344 } 345 continue; 346 } 347 } else if (Wflag) { 348 warnx("%s: %s", f, strerror(EEXIST)); 349 eval = 1; 350 continue; 351 } 352 353 if (S_ISDIR(sb.st_mode) && !dflag) { 354 warnx("%s: is a directory", f); 355 eval = 1; 356 continue; 357 } 358 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 359 continue; 360 rval = 0; 361 if (!uid && !S_ISWHT(sb.st_mode) && 362 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) && 363 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE))) 364 rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE)); 365 if (rval == 0) { 366 if (S_ISWHT(sb.st_mode)) 367 rval = undelete(f); 368 else if (S_ISDIR(sb.st_mode)) 369 rval = rmdir(f); 370 else 371 rval = unlink(f); 372 } 373 if (rval && (!fflag || errno != ENOENT)) { 374 warn("%s", f); 375 eval = 1; 376 } 377 if (vflag && rval == 0) 378 (void)printf("%s\n", f); 379 if (info && rval == 0) { 380 info = 0; 381 (void)printf("%s\n", f); 382 } 383 } 384 } 385 386 static int 387 check(const char *path, const char *name, struct stat *sp) 388 { 389 int ch, first; 390 char modep[15], *flagsp; 391 392 /* Check -i first. */ 393 if (iflag) 394 (void)fprintf(stderr, "remove %s? ", path); 395 else { 396 /* 397 * If it's not a symbolic link and it's unwritable and we're 398 * talking to a terminal, ask. Symbolic links are excluded 399 * because their permissions are meaningless. Check stdin_ok 400 * first because we may not have stat'ed the file. 401 */ 402 if (!stdin_ok || S_ISLNK(sp->st_mode) || 403 (!access(name, W_OK) && 404 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 405 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))) 406 return (1); 407 strmode(sp->st_mode, modep); 408 if ((flagsp = fflagstostr(sp->st_flags)) == NULL) 409 err(1, "fflagstostr"); 410 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ", 411 modep + 1, modep[10] == ' ' ? "" : " ", 412 user_from_uid(sp->st_uid, 0), 413 group_from_gid(sp->st_gid, 0), 414 *flagsp ? flagsp : "", *flagsp ? " " : "", 415 path); 416 free(flagsp); 417 } 418 (void)fflush(stderr); 419 420 first = ch = getchar(); 421 while (ch != '\n' && ch != EOF) 422 ch = getchar(); 423 return (first == 'y' || first == 'Y'); 424 } 425 426 #define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0') 427 static void 428 checkslash(char **argv) 429 { 430 char **t, **u; 431 int complained; 432 433 complained = 0; 434 for (t = argv; *t;) { 435 if (ISSLASH(*t)) { 436 if (!complained++) 437 warnx("\"/\" may not be removed"); 438 eval = 1; 439 for (u = t; u[0] != NULL; ++u) 440 u[0] = u[1]; 441 } else { 442 ++t; 443 } 444 } 445 } 446 447 static int 448 check2(char **argv) 449 { 450 struct stat st; 451 int first; 452 int ch; 453 int fcount = 0; 454 int dcount = 0; 455 int i; 456 const char *dname = NULL; 457 458 for (i = 0; argv[i]; ++i) { 459 if (lstat(argv[i], &st) == 0) { 460 if (S_ISDIR(st.st_mode)) { 461 ++dcount; 462 dname = argv[i]; /* only used if 1 dir */ 463 } else { 464 ++fcount; 465 } 466 } 467 } 468 first = 0; 469 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') { 470 if (dcount && rflag) { 471 fprintf(stderr, "recursively remove"); 472 if (dcount == 1) 473 fprintf(stderr, " %s", dname); 474 else 475 fprintf(stderr, " %d dirs", dcount); 476 if (fcount == 1) 477 fprintf(stderr, " and 1 file"); 478 else if (fcount > 1) 479 fprintf(stderr, " and %d files", fcount); 480 } else if (dcount + fcount > 3) { 481 fprintf(stderr, "remove %d files", dcount + fcount); 482 } else { 483 return(1); 484 } 485 fprintf(stderr, "? "); 486 fflush(stderr); 487 488 first = ch = getchar(); 489 while (ch != '\n' && ch != EOF) 490 ch = getchar(); 491 if (ch == EOF) 492 break; 493 } 494 return (first == 'y' || first == 'Y'); 495 } 496 497 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 498 static void 499 checkdot(char **argv) 500 { 501 char *p, **save, **t; 502 int complained; 503 504 complained = 0; 505 for (t = argv; *t;) { 506 if ((p = strrchr(*t, '/')) != NULL) 507 ++p; 508 else 509 p = *t; 510 if (ISDOT(p)) { 511 if (!complained++) 512 warnx("\".\" and \"..\" may not be removed"); 513 eval = 1; 514 for (save = t; (t[0] = t[1]) != NULL; ++t) 515 continue; 516 t = save; 517 } else 518 ++t; 519 } 520 } 521 522 static void 523 usage(void) 524 { 525 526 (void)fprintf(stderr, "%s\n%s\n", 527 "usage: rm [-f | -i] [-dIPRrvWx] file ...", 528 " unlink [--] file"); 529 exit(EX_USAGE); 530 } 531 532 static void 533 siginfo(int sig __unused) 534 { 535 536 info = 1; 537 } 538