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 * $Id: rm.c,v 1.11 1996/03/07 23:26:59 wosch Exp $ 34 */ 35 36 #ifndef lint 37 static char const copyright[] = 38 "@(#) Copyright (c) 1990, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 static char const sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94"; 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 #include <sys/stat.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <fts.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 /* 59 * XXX Until we get kernel support for the undelete(2) system call, 60 * this define *must* remain in place. 61 */ 62 #define BSD4_4_LITE 63 64 extern char *flags_to_string __P((u_long, char *)); 65 66 #ifdef BSD4_4_LITE 67 int dflag, eval, fflag, iflag, Pflag, stdin_ok; 68 #else 69 int dflag, eval, fflag, iflag, Pflag, Wflag, stdin_ok; 70 #endif 71 uid_t uid; 72 73 int check __P((char *, char *, struct stat *)); 74 void checkdot __P((char **)); 75 void rm_file __P((char **)); 76 void rm_overwrite __P((char *, struct stat *)); 77 void rm_tree __P((char **)); 78 void usage __P((void)); 79 80 /* 81 * rm -- 82 * This rm is different from historic rm's, but is expected to match 83 * POSIX 1003.2 behavior. The most visible difference is that -f 84 * has two specific effects now, ignore non-existent files and force 85 * file removal. 86 */ 87 int 88 main(argc, argv) 89 int argc; 90 char *argv[]; 91 { 92 int ch, rflag; 93 94 Pflag = rflag = 0; 95 #ifdef BSD4_4_LITE 96 while ((ch = getopt(argc, argv, "dfiPRr")) != EOF) 97 #else 98 while ((ch = getopt(argc, argv, "dfiPRrW")) != EOF) 99 #endif 100 switch(ch) { 101 case 'd': 102 dflag = 1; 103 break; 104 case 'f': 105 fflag = 1; 106 iflag = 0; 107 break; 108 case 'i': 109 fflag = 0; 110 iflag = 1; 111 break; 112 case 'P': 113 Pflag = 1; 114 break; 115 case 'R': 116 case 'r': /* Compatibility. */ 117 rflag = 1; 118 break; 119 #ifndef BSD4_4_LITE 120 case 'W': 121 Wflag = 1; 122 break; 123 #endif 124 default: 125 usage(); 126 } 127 argc -= optind; 128 argv += optind; 129 130 if (argc < 1) 131 usage(); 132 133 checkdot(argv); 134 uid = geteuid(); 135 136 if (*argv) { 137 stdin_ok = isatty(STDIN_FILENO); 138 139 if (rflag) 140 rm_tree(argv); 141 else 142 rm_file(argv); 143 } 144 145 exit (eval); 146 } 147 148 void 149 rm_tree(argv) 150 char **argv; 151 { 152 FTS *fts; 153 FTSENT *p; 154 int needstat; 155 int flags; 156 int rval; 157 158 /* 159 * Remove a file hierarchy. If forcing removal (-f), or interactive 160 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 161 */ 162 needstat = !uid || (!fflag && !iflag && stdin_ok); 163 164 /* 165 * If the -i option is specified, the user can skip on the pre-order 166 * visit. The fts_number field flags skipped directories. 167 */ 168 #define SKIPPED 1 169 170 flags = FTS_PHYSICAL | FTS_NOCHDIR; 171 if (!needstat) 172 flags |= FTS_NOSTAT; 173 #ifndef BSD4_4_LITE 174 if (Wflag) 175 flags |= FTS_WHITEOUT; 176 #endif 177 if (!(fts = fts_open(argv, flags, (int (*)())NULL))) 178 err(1, NULL); 179 while ((p = fts_read(fts)) != NULL) { 180 switch (p->fts_info) { 181 case FTS_DNR: 182 if (!fflag || p->fts_errno != ENOENT) { 183 warnx("%s: %s", 184 p->fts_path, strerror(p->fts_errno)); 185 eval = 1; 186 } 187 continue; 188 case FTS_ERR: 189 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 190 case FTS_NS: 191 /* 192 * FTS_NS: assume that if can't stat the file, it 193 * can't be unlinked. 194 */ 195 if (!needstat) 196 break; 197 if (!fflag || p->fts_errno != ENOENT) { 198 warnx("%s: %s", 199 p->fts_path, strerror(p->fts_errno)); 200 eval = 1; 201 } 202 continue; 203 case FTS_D: 204 /* Pre-order: give user chance to skip. */ 205 if (!fflag && !check(p->fts_path, p->fts_accpath, 206 p->fts_statp)) { 207 (void)fts_set(fts, p, FTS_SKIP); 208 p->fts_number = SKIPPED; 209 } 210 else if (!uid && 211 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 212 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 213 chflags(p->fts_accpath, 214 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0) 215 goto err; 216 continue; 217 case FTS_DP: 218 /* Post-order: see if user skipped. */ 219 if (p->fts_number == SKIPPED) 220 continue; 221 break; 222 default: 223 if (!fflag && 224 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 225 continue; 226 } 227 228 rval = 0; 229 if (!uid && 230 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 231 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE))) 232 rval = chflags(p->fts_accpath, 233 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); 234 if (!rval) { 235 /* 236 * If we can't read or search the directory, may still be 237 * able to remove it. Don't print out the un{read,search}able 238 * message unless the remove fails. 239 */ 240 switch (p->fts_info) { 241 case FTS_DP: 242 case FTS_DNR: 243 if (!rmdir(p->fts_accpath) || (fflag && errno == ENOENT)) 244 continue; 245 break; 246 247 #ifndef BSD4_4_LITE 248 case FTS_W: 249 if (!undelete(p->fts_accpath) || 250 fflag && errno == ENOENT) 251 continue; 252 break; 253 #endif 254 255 default: 256 if (Pflag) 257 rm_overwrite(p->fts_accpath, NULL); 258 if (!unlink(p->fts_accpath) || (fflag && errno == ENOENT)) 259 continue; 260 } 261 } 262 err: 263 warn("%s", p->fts_path); 264 eval = 1; 265 } 266 if (errno) 267 err(1, "fts_read"); 268 } 269 270 void 271 rm_file(argv) 272 char **argv; 273 { 274 struct stat sb; 275 int rval; 276 char *f; 277 278 /* 279 * Remove a file. POSIX 1003.2 states that, by default, attempting 280 * to remove a directory is an error, so must always stat the file. 281 */ 282 while ((f = *argv++) != NULL) { 283 /* Assume if can't stat the file, can't unlink it. */ 284 if (lstat(f, &sb)) { 285 #ifdef BSD4_4_LITE 286 if (!fflag || errno != ENOENT) { 287 warn("%s", f); 288 eval = 1; 289 } 290 #else 291 if (Wflag) { 292 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 293 } else { 294 if (!fflag || errno != ENOENT) { 295 warn("%s", f); 296 eval = 1; 297 } 298 continue; 299 } 300 } else if (Wflag) { 301 warnx("%s: %s", f, strerror(EEXIST)); 302 eval = 1; 303 #endif 304 continue; 305 } 306 307 if (S_ISDIR(sb.st_mode) && !dflag) { 308 warnx("%s: is a directory", f); 309 eval = 1; 310 continue; 311 } 312 #ifdef BSD4_4_LITE 313 if (!fflag && !check(f, f, &sb)) 314 #else 315 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 316 #endif 317 continue; 318 rval = 0; 319 if (!uid && 320 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) && 321 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE))) 322 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE)); 323 if (!rval) { 324 #ifdef BSD4_4_LITE 325 if (S_ISDIR(sb.st_mode)) 326 #else 327 if (S_ISWHT(sb.st_mode)) 328 rval = undelete(f); 329 else if (S_ISDIR(sb.st_mode)) 330 #endif 331 rval = rmdir(f); 332 else { 333 if (Pflag) 334 rm_overwrite(f, &sb); 335 rval = unlink(f); 336 } 337 } 338 if (rval && (!fflag || errno != ENOENT)) { 339 warn("%s", f); 340 eval = 1; 341 } 342 } 343 } 344 345 /* 346 * rm_overwrite -- 347 * Overwrite the file 3 times with varying bit patterns. 348 * 349 * XXX 350 * This is a cheap way to *really* delete files. Note that only regular 351 * files are deleted, directories (and therefore names) will remain. 352 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 353 * System V file system). In a logging file system, you'll have to have 354 * kernel support. 355 */ 356 void 357 rm_overwrite(file, sbp) 358 char *file; 359 struct stat *sbp; 360 { 361 struct stat sb; 362 off_t len; 363 int fd, wlen; 364 char buf[8 * 1024]; 365 366 fd = -1; 367 if (sbp == NULL) { 368 if (lstat(file, &sb)) 369 goto err; 370 sbp = &sb; 371 } 372 if (!S_ISREG(sbp->st_mode)) 373 return; 374 if ((fd = open(file, O_WRONLY, 0)) == -1) 375 goto err; 376 377 #define PASS(byte) { \ 378 memset(buf, byte, sizeof(buf)); \ 379 for (len = sbp->st_size; len > 0; len -= wlen) { \ 380 wlen = len < sizeof(buf) ? len : sizeof(buf); \ 381 if (write(fd, buf, wlen) != wlen) \ 382 goto err; \ 383 } \ 384 } 385 PASS(0xff); 386 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 387 goto err; 388 PASS(0x00); 389 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 390 goto err; 391 PASS(0xff); 392 if (!fsync(fd) && !close(fd)) 393 return; 394 395 err: eval = 1; 396 warn("%s", file); 397 } 398 399 400 int 401 check(path, name, sp) 402 char *path, *name; 403 struct stat *sp; 404 { 405 int ch, first; 406 char modep[15], flagsp[128]; 407 408 /* Check -i first. */ 409 if (iflag) 410 (void)fprintf(stderr, "remove %s? ", path); 411 else { 412 /* 413 * If it's not a symbolic link and it's unwritable and we're 414 * talking to a terminal, ask. Symbolic links are excluded 415 * because their permissions are meaningless. Check stdin_ok 416 * first because we may not have stat'ed the file. 417 */ 418 if (!stdin_ok || S_ISLNK(sp->st_mode) || 419 (!access(name, W_OK) && 420 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 421 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))) 422 return (1); 423 strmode(sp->st_mode, modep); 424 strcpy(flagsp, flags_to_string(sp->st_flags, NULL)); 425 if (*flagsp) 426 strcat(flagsp, " "); 427 (void)fprintf(stderr, "override %s%s%s/%s %sfor %s? ", 428 modep + 1, modep[9] == ' ' ? "" : " ", 429 user_from_uid(sp->st_uid, 0), 430 group_from_gid(sp->st_gid, 0), 431 *flagsp ? flagsp : "", 432 path); 433 } 434 (void)fflush(stderr); 435 436 first = ch = getchar(); 437 while (ch != '\n' && ch != EOF) 438 ch = getchar(); 439 return (first == 'y' || first == 'Y'); 440 } 441 442 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 443 void 444 checkdot(argv) 445 char **argv; 446 { 447 char *p, **save, **t; 448 int complained; 449 450 complained = 0; 451 for (t = argv; *t;) { 452 if ((p = strrchr(*t, '/')) != NULL) 453 ++p; 454 else 455 p = *t; 456 if (ISDOT(p)) { 457 if (!complained++) 458 warnx("\".\" and \"..\" may not be removed"); 459 eval = 1; 460 for (save = t; (t[0] = t[1]) != NULL; ++t) 461 continue; 462 t = save; 463 } else 464 ++t; 465 } 466 } 467 468 void 469 usage() 470 { 471 472 #ifdef BSD4_4_LITE 473 (void)fprintf(stderr, "usage: rm [-f | -i] [-dPRr] file ...\n"); 474 #else 475 (void)fprintf(stderr, "usage: rm [-f | -i] [-dPRrW] file ...\n"); 476 #endif 477 exit(1); 478 } 479