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