| 1 | /* $NetBSD: rm.c,v 1.24 1998/07/28 11:41:51 mycroft Exp $ */ |
| 2 | |
| 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. All advertising materials mentioning features or use of this software |
| 16 | * must display the following acknowledgement: |
| 17 | * This product includes software developed by the University of |
| 18 | * California, Berkeley and its contributors. |
| 19 | * 4. Neither the name of the University nor the names of its contributors |
| 20 | * may be used to endorse or promote products derived from this software |
| 21 | * without specific prior written permission. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 33 | * SUCH DAMAGE. |
| 34 | */ |
| 35 | |
| 36 | #include <sys/cdefs.h> |
| 37 | #ifndef lint |
| 38 | __COPYRIGHT("@(#) 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 | #if 0 |
| 44 | static char sccsid[] = "@(#)rm.c 8.8 (Berkeley) 4/27/95"; |
| 45 | #else |
| 46 | __RCSID("$NetBSD: rm.c,v 1.24 1998/07/28 11:41:51 mycroft Exp $"); |
| 47 | #endif |
| 48 | #endif /* not lint */ |
| 49 | |
| 50 | #include <sys/types.h> |
| 51 | #include <sys/stat.h> |
| 52 | |
| 53 | #include <locale.h> |
| 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 | #include <pwd.h> |
| 63 | #include <grp.h> |
| 64 | |
| 65 | int dflag, eval, fflag, iflag, Pflag, Wflag, stdin_ok; |
| 66 | |
| 67 | int check __P((char *, char *, struct stat *)); |
| 68 | void checkdot __P((char **)); |
| 69 | void rm_file __P((char **)); |
| 70 | void rm_overwrite __P((char *, struct stat *)); |
| 71 | void rm_tree __P((char **)); |
| 72 | void usage __P((void)); |
| 73 | int main __P((int, char *[])); |
| 74 | |
| 75 | #ifdef __APPLE__ /* We're missing this prototype */ |
| 76 | int undelete __P((char *)); |
| 77 | #endif |
| 78 | |
| 79 | /* |
| 80 | * For the sake of the `-f' flag, check whether an error number indicates the |
| 81 | * failure of an operation due to an non-existent file, either per se (ENOENT) |
| 82 | * or because its filename argument was illegal (ENAMETOOLONG, ENOTDIR). |
| 83 | */ |
| 84 | #define NONEXISTENT(x) \ |
| 85 | ((x) == ENOENT || (x) == ENAMETOOLONG || (x) == ENOTDIR) |
| 86 | |
| 87 | /* |
| 88 | * rm -- |
| 89 | * This rm is different from historic rm's, but is expected to match |
| 90 | * POSIX 1003.2 behavior. The most visible difference is that -f |
| 91 | * has two specific effects now, ignore non-existent files and force |
| 92 | * file removal. |
| 93 | */ |
| 94 | int |
| 95 | main(argc, argv) |
| 96 | int argc; |
| 97 | char *argv[]; |
| 98 | { |
| 99 | int ch, rflag; |
| 100 | |
| 101 | (void)setlocale(LC_ALL, ""); |
| 102 | |
| 103 | Pflag = rflag = 0; |
| 104 | while ((ch = getopt(argc, argv, "dfiPRrW")) != -1) |
| 105 | switch(ch) { |
| 106 | case 'd': |
| 107 | dflag = 1; |
| 108 | break; |
| 109 | case 'f': |
| 110 | fflag = 1; |
| 111 | iflag = 0; |
| 112 | break; |
| 113 | case 'i': |
| 114 | fflag = 0; |
| 115 | iflag = 1; |
| 116 | break; |
| 117 | case 'P': |
| 118 | Pflag = 1; |
| 119 | break; |
| 120 | case 'R': |
| 121 | case 'r': /* Compatibility. */ |
| 122 | rflag = 1; |
| 123 | break; |
| 124 | case 'W': |
| 125 | Wflag = 1; |
| 126 | break; |
| 127 | case '?': |
| 128 | default: |
| 129 | usage(); |
| 130 | } |
| 131 | argc -= optind; |
| 132 | argv += optind; |
| 133 | |
| 134 | if (argc < 1) |
| 135 | usage(); |
| 136 | |
| 137 | checkdot(argv); |
| 138 | |
| 139 | if (*argv) { |
| 140 | stdin_ok = isatty(STDIN_FILENO); |
| 141 | |
| 142 | if (rflag) |
| 143 | rm_tree(argv); |
| 144 | else |
| 145 | rm_file(argv); |
| 146 | } |
| 147 | |
| 148 | exit(eval); |
| 149 | /* NOTREACHED */ |
| 150 | } |
| 151 | |
| 152 | void |
| 153 | rm_tree(argv) |
| 154 | char **argv; |
| 155 | { |
| 156 | FTS *fts; |
| 157 | FTSENT *p; |
| 158 | int needstat; |
| 159 | int flags; |
| 160 | |
| 161 | /* |
| 162 | * Remove a file hierarchy. If forcing removal (-f), or interactive |
| 163 | * (-i) or can't ask anyway (stdin_ok), don't stat the file. |
| 164 | */ |
| 165 | needstat = !fflag && !iflag && stdin_ok; |
| 166 | |
| 167 | /* |
| 168 | * If the -i option is specified, the user can skip on the pre-order |
| 169 | * visit. The fts_number field flags skipped directories. |
| 170 | */ |
| 171 | #define SKIPPED 1 |
| 172 | |
| 173 | flags = FTS_PHYSICAL; |
| 174 | if (!needstat) |
| 175 | flags |= FTS_NOSTAT; |
| 176 | if (Wflag) |
| 177 | flags |= FTS_WHITEOUT; |
| 178 | if (!(fts = fts_open(argv, flags, |
| 179 | (int (*) __P((const FTSENT **, const FTSENT **)))NULL))) |
| 180 | err(1, "%s", ""); |
| 181 | while ((p = fts_read(fts)) != NULL) { |
| 182 | switch (p->fts_info) { |
| 183 | case FTS_DNR: |
| 184 | if (!fflag || p->fts_errno != ENOENT) { |
| 185 | warnx("%s: %s", |
| 186 | p->fts_path, strerror(p->fts_errno)); |
| 187 | eval = 1; |
| 188 | } |
| 189 | continue; |
| 190 | case FTS_ERR: |
| 191 | errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); |
| 192 | /* NOTREACHED */ |
| 193 | case FTS_NS: |
| 194 | /* |
| 195 | * FTS_NS: assume that if can't stat the file, it |
| 196 | * can't be unlinked. |
| 197 | */ |
| 198 | if (!needstat) |
| 199 | break; |
| 200 | if (!fflag || !NONEXISTENT(p->fts_errno)) { |
| 201 | warnx("%s: %s", |
| 202 | p->fts_path, strerror(p->fts_errno)); |
| 203 | eval = 1; |
| 204 | } |
| 205 | continue; |
| 206 | case FTS_D: |
| 207 | /* Pre-order: give user chance to skip. */ |
| 208 | if (!fflag && !check(p->fts_path, p->fts_accpath, |
| 209 | p->fts_statp)) { |
| 210 | (void)fts_set(fts, p, FTS_SKIP); |
| 211 | p->fts_number = SKIPPED; |
| 212 | } |
| 213 | continue; |
| 214 | case FTS_DP: |
| 215 | /* Post-order: see if user skipped. */ |
| 216 | if (p->fts_number == SKIPPED) |
| 217 | continue; |
| 218 | break; |
| 219 | default: |
| 220 | if (!fflag && |
| 221 | !check(p->fts_path, p->fts_accpath, p->fts_statp)) |
| 222 | continue; |
| 223 | } |
| 224 | |
| 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) || |
| 234 | (fflag && errno == ENOENT)) |
| 235 | continue; |
| 236 | break; |
| 237 | |
| 238 | case FTS_W: |
| 239 | if (!undelete(p->fts_accpath) || |
| 240 | (fflag && errno == ENOENT)) |
| 241 | continue; |
| 242 | break; |
| 243 | |
| 244 | default: |
| 245 | if (Pflag) |
| 246 | rm_overwrite(p->fts_accpath, NULL); |
| 247 | if (!unlink(p->fts_accpath) || |
| 248 | (fflag && NONEXISTENT(errno))) |
| 249 | continue; |
| 250 | } |
| 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 || !NONEXISTENT(errno)) { |
| 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 | if (S_ISWHT(sb.st_mode)) |
| 296 | rval = undelete(f); |
| 297 | else if (S_ISDIR(sb.st_mode)) |
| 298 | rval = rmdir(f); |
| 299 | else { |
| 300 | if (Pflag) |
| 301 | rm_overwrite(f, &sb); |
| 302 | rval = unlink(f); |
| 303 | } |
| 304 | if (rval && (!fflag || !NONEXISTENT(errno))) { |
| 305 | warn("%s", f); |
| 306 | eval = 1; |
| 307 | } |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * rm_overwrite -- |
| 313 | * Overwrite the file 3 times with varying bit patterns. |
| 314 | * |
| 315 | * XXX |
| 316 | * This is a cheap way to *really* delete files. Note that only regular |
| 317 | * files are deleted, directories (and therefore names) will remain. |
| 318 | * Also, this assumes a fixed-block file system (like FFS, or a V7 or a |
| 319 | * System V file system). In a logging file system, you'll have to have |
| 320 | * kernel support. |
| 321 | */ |
| 322 | void |
| 323 | rm_overwrite(file, sbp) |
| 324 | char *file; |
| 325 | struct stat *sbp; |
| 326 | { |
| 327 | struct stat sb; |
| 328 | off_t len; |
| 329 | int fd, wlen; |
| 330 | char buf[8 * 1024]; |
| 331 | |
| 332 | fd = -1; |
| 333 | if (sbp == NULL) { |
| 334 | if (lstat(file, &sb)) |
| 335 | goto err; |
| 336 | sbp = &sb; |
| 337 | } |
| 338 | if (!S_ISREG(sbp->st_mode)) |
| 339 | return; |
| 340 | if ((fd = open(file, O_WRONLY, 0)) == -1) |
| 341 | goto err; |
| 342 | |
| 343 | #define PASS(byte) { \ |
| 344 | memset(buf, byte, sizeof(buf)); \ |
| 345 | for (len = sbp->st_size; len > 0; len -= wlen) { \ |
| 346 | wlen = len < sizeof(buf) ? len : sizeof(buf); \ |
| 347 | if (write(fd, buf, wlen) != wlen) \ |
| 348 | goto err; \ |
| 349 | } \ |
| 350 | } |
| 351 | PASS(0xff); |
| 352 | if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) |
| 353 | goto err; |
| 354 | PASS(0x00); |
| 355 | if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) |
| 356 | goto err; |
| 357 | PASS(0xff); |
| 358 | if (!fsync(fd) && !close(fd)) |
| 359 | return; |
| 360 | |
| 361 | err: eval = 1; |
| 362 | warn("%s", file); |
| 363 | } |
| 364 | |
| 365 | |
| 366 | int |
| 367 | check(path, name, sp) |
| 368 | char *path, *name; |
| 369 | struct stat *sp; |
| 370 | { |
| 371 | int ch, first; |
| 372 | char modep[15]; |
| 373 | |
| 374 | /* Check -i first. */ |
| 375 | if (iflag) |
| 376 | (void)fprintf(stderr, "remove %s? ", path); |
| 377 | else { |
| 378 | /* |
| 379 | * If it's not a symbolic link and it's unwritable and we're |
| 380 | * talking to a terminal, ask. Symbolic links are excluded |
| 381 | * because their permissions are meaningless. Check stdin_ok |
| 382 | * first because we may not have stat'ed the file. |
| 383 | */ |
| 384 | if (!stdin_ok || S_ISLNK(sp->st_mode) || !access(name, W_OK)) |
| 385 | return (1); |
| 386 | strmode(sp->st_mode, modep); |
| 387 | (void)fprintf(stderr, "override %s%s%s/%s for %s? ", |
| 388 | modep + 1, modep[9] == ' ' ? "" : " ", |
| 389 | user_from_uid(sp->st_uid, 0), |
| 390 | group_from_gid(sp->st_gid, 0), path); |
| 391 | } |
| 392 | (void)fflush(stderr); |
| 393 | |
| 394 | first = ch = getchar(); |
| 395 | while (ch != '\n' && ch != EOF) |
| 396 | ch = getchar(); |
| 397 | return (first == 'y' || first == 'Y'); |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * POSIX.2 requires that if "." or ".." are specified as the basename |
| 402 | * portion of an operand, a diagnostic message be written to standard |
| 403 | * error and nothing more be done with such operands. |
| 404 | * |
| 405 | * Since POSIX.2 defines basename as the final portion of a path after |
| 406 | * trailing slashes have been removed, we'll remove them here. |
| 407 | */ |
| 408 | #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) |
| 409 | void |
| 410 | checkdot(argv) |
| 411 | char **argv; |
| 412 | { |
| 413 | char *p, **save, **t; |
| 414 | int complained; |
| 415 | |
| 416 | complained = 0; |
| 417 | for (t = argv; *t;) { |
| 418 | /* strip trailing slashes */ |
| 419 | p = strrchr (*t, '\0'); |
| 420 | while (--p > *t && *p == '/') |
| 421 | *p = '\0'; |
| 422 | |
| 423 | /* extract basename */ |
| 424 | if ((p = strrchr(*t, '/')) != NULL) |
| 425 | ++p; |
| 426 | else |
| 427 | p = *t; |
| 428 | |
| 429 | if (ISDOT(p)) { |
| 430 | if (!complained++) |
| 431 | warnx("\".\" and \"..\" may not be removed"); |
| 432 | eval = 1; |
| 433 | for (save = t; (t[0] = t[1]) != NULL; ++t) |
| 434 | continue; |
| 435 | t = save; |
| 436 | } else |
| 437 | ++t; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | void |
| 442 | usage() |
| 443 | { |
| 444 | |
| 445 | (void)fprintf(stderr, "usage: rm [-dfiPRrW] file ...\n"); |
| 446 | exit(1); |
| 447 | /* NOTREACHED */ |
| 448 | } |