rm.c revision 1.34
1 /* $NetBSD: rm.c,v 1.34 2003/03/01 07:57:33 enami Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993, 1994, 2003 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 1.34 2003/03/01 07:57:33 enami 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 <grp.h> 59 #include <pwd.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 int dflag, eval, fflag, iflag, Pflag, stdin_ok, vflag, Wflag; 66 67 int check(char *, char *, struct stat *); 68 void checkdot(char **); 69 void rm_file(char **); 70 void rm_overwrite(char *, struct stat *); 71 void rm_tree(char **); 72 void usage(void); 73 int main(int, char *[]); 74 75 /* 76 * For the sake of the `-f' flag, check whether an error number indicates the 77 * failure of an operation due to an non-existent file, either per se (ENOENT) 78 * or because its filename argument was illegal (ENAMETOOLONG, ENOTDIR). 79 */ 80 #define NONEXISTENT(x) \ 81 ((x) == ENOENT || (x) == ENAMETOOLONG || (x) == ENOTDIR) 82 83 /* 84 * rm -- 85 * This rm is different from historic rm's, but is expected to match 86 * POSIX 1003.2 behavior. The most visible difference is that -f 87 * has two specific effects now, ignore non-existent files and force 88 * file removal. 89 */ 90 int 91 main(int argc, char *argv[]) 92 { 93 int ch, rflag; 94 95 setprogname(argv[0]); 96 (void)setlocale(LC_ALL, ""); 97 98 Pflag = rflag = 0; 99 while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1) 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 case 'v': 120 vflag = 1; 121 break; 122 case 'W': 123 Wflag = 1; 124 break; 125 case '?': 126 default: 127 usage(); 128 } 129 argc -= optind; 130 argv += optind; 131 132 if (argc < 1) 133 usage(); 134 135 checkdot(argv); 136 137 if (*argv) { 138 stdin_ok = isatty(STDIN_FILENO); 139 140 if (rflag) 141 rm_tree(argv); 142 else 143 rm_file(argv); 144 } 145 146 exit(eval); 147 /* NOTREACHED */ 148 } 149 150 void 151 rm_tree(char **argv) 152 { 153 FTS *fts; 154 FTSENT *p; 155 int flags, needstat, rval; 156 157 /* 158 * Remove a file hierarchy. If forcing removal (-f), or interactive 159 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 160 */ 161 needstat = !fflag && !iflag && stdin_ok; 162 163 /* 164 * If the -i option is specified, the user can skip on the pre-order 165 * visit. The fts_number field flags skipped directories. 166 */ 167 #define SKIPPED 1 168 169 flags = FTS_PHYSICAL; 170 if (!needstat) 171 flags |= FTS_NOSTAT; 172 if (Wflag) 173 flags |= FTS_WHITEOUT; 174 if (!(fts = fts_open(argv, flags, 175 (int (*)(const FTSENT **, const FTSENT **))NULL))) 176 err(1, NULL); 177 while ((p = fts_read(fts)) != NULL) { 178 switch (p->fts_info) { 179 case FTS_DNR: 180 if (!fflag || p->fts_errno != ENOENT) { 181 warnx("%s: %s", 182 p->fts_path, strerror(p->fts_errno)); 183 eval = 1; 184 } 185 continue; 186 case FTS_ERR: 187 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 188 /* NOTREACHED */ 189 case FTS_NS: 190 /* 191 * FTS_NS: assume that if can't stat the file, it 192 * can't be unlinked. 193 */ 194 if (fflag && NONEXISTENT(p->fts_errno)) 195 continue; 196 if (needstat) { 197 warnx("%s: %s", 198 p->fts_path, strerror(p->fts_errno)); 199 eval = 1; 200 continue; 201 } 202 break; 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 continue; 211 case FTS_DP: 212 /* Post-order: see if user skipped. */ 213 if (p->fts_number == SKIPPED) 214 continue; 215 break; 216 default: 217 if (!fflag && 218 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 219 continue; 220 } 221 222 rval = 0; 223 /* 224 * If we can't read or search the directory, may still be 225 * able to remove it. Don't print out the un{read,search}able 226 * message unless the remove fails. 227 */ 228 switch (p->fts_info) { 229 case FTS_DP: 230 case FTS_DNR: 231 rval = rmdir(p->fts_accpath); 232 if (rval != 0 && fflag && errno == ENOENT) 233 continue; 234 break; 235 236 case FTS_W: 237 rval = undelete(p->fts_accpath); 238 if (rval != 0 && fflag && errno == ENOENT) 239 continue; 240 break; 241 242 default: 243 if (Pflag) 244 rm_overwrite(p->fts_accpath, NULL); 245 rval = unlink(p->fts_accpath); 246 if (rval != 0 && fflag && NONEXISTENT(errno)) 247 continue; 248 break; 249 } 250 if (rval != 0) { 251 warn("%s", p->fts_path); 252 eval = 1; 253 } else if (vflag) 254 (void)printf("%s\n", p->fts_path); 255 } 256 if (errno) 257 err(1, "fts_read"); 258 } 259 260 void 261 rm_file(char **argv) 262 { 263 struct stat sb; 264 int rval; 265 char *f; 266 267 /* 268 * Remove a file. POSIX 1003.2 states that, by default, attempting 269 * to remove a directory is an error, so must always stat the file. 270 */ 271 while ((f = *argv++) != NULL) { 272 /* Assume if can't stat the file, can't unlink it. */ 273 if (lstat(f, &sb)) { 274 if (Wflag) { 275 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 276 } else { 277 if (!fflag || !NONEXISTENT(errno)) { 278 warn("%s", f); 279 eval = 1; 280 } 281 continue; 282 } 283 } else if (Wflag) { 284 warnx("%s: %s", f, strerror(EEXIST)); 285 eval = 1; 286 continue; 287 } 288 289 if (S_ISDIR(sb.st_mode) && !dflag) { 290 warnx("%s: is a directory", f); 291 eval = 1; 292 continue; 293 } 294 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 295 continue; 296 if (S_ISWHT(sb.st_mode)) 297 rval = undelete(f); 298 else if (S_ISDIR(sb.st_mode)) 299 rval = rmdir(f); 300 else { 301 if (Pflag) 302 rm_overwrite(f, &sb); 303 rval = unlink(f); 304 } 305 if (rval && (!fflag || !NONEXISTENT(errno))) { 306 warn("%s", f); 307 eval = 1; 308 } 309 if (vflag && rval == 0) 310 (void)printf("%s\n", f); 311 } 312 } 313 314 /* 315 * rm_overwrite -- 316 * Overwrite the file 3 times with varying bit patterns. 317 * 318 * XXX 319 * This is a cheap way to *really* delete files. Note that only regular 320 * files are deleted, directories (and therefore names) will remain. 321 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 322 * System V file system). In a logging file system, you'll have to have 323 * kernel support. 324 */ 325 void 326 rm_overwrite(char *file, struct stat *sbp) 327 { 328 struct stat sb; 329 off_t len; 330 int fd, wlen; 331 char buf[8 * 1024]; 332 333 fd = -1; 334 if (sbp == NULL) { 335 if (lstat(file, &sb)) 336 goto err; 337 sbp = &sb; 338 } 339 if (!S_ISREG(sbp->st_mode)) 340 return; 341 if ((fd = open(file, O_WRONLY, 0)) == -1) 342 goto err; 343 344 #define PASS(byte) do { \ 345 memset(buf, byte, sizeof(buf)); \ 346 for (len = sbp->st_size; len > 0; len -= wlen) { \ 347 wlen = len < sizeof(buf) ? len : sizeof(buf); \ 348 if (write(fd, buf, wlen) != wlen) \ 349 goto err; \ 350 } \ 351 } while (/* CONSTCOND */ 0) 352 PASS(0xff); 353 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 354 goto err; 355 PASS(0x00); 356 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 357 goto err; 358 PASS(0xff); 359 if (!fsync(fd) && !close(fd)) 360 return; 361 362 err: eval = 1; 363 warn("%s", file); 364 } 365 366 int 367 check(char *path, char *name, struct stat *sp) 368 { 369 int ch, first; 370 char modep[15]; 371 372 /* Check -i first. */ 373 if (iflag) 374 (void)fprintf(stderr, "remove %s? ", path); 375 else { 376 /* 377 * If it's not a symbolic link and it's unwritable and we're 378 * talking to a terminal, ask. Symbolic links are excluded 379 * because their permissions are meaningless. Check stdin_ok 380 * first because we may not have stat'ed the file. 381 */ 382 if (!stdin_ok || S_ISLNK(sp->st_mode) || 383 !(access(name, W_OK) && (errno != ETXTBSY))) 384 return (1); 385 strmode(sp->st_mode, modep); 386 (void)fprintf(stderr, "override %s%s%s/%s for %s? ", 387 modep + 1, modep[9] == ' ' ? "" : " ", 388 user_from_uid(sp->st_uid, 0), 389 group_from_gid(sp->st_gid, 0), path); 390 } 391 (void)fflush(stderr); 392 393 first = ch = getchar(); 394 while (ch != '\n' && ch != EOF) 395 ch = getchar(); 396 return (first == 'y' || first == 'Y'); 397 } 398 399 /* 400 * POSIX.2 requires that if "." or ".." are specified as the basename 401 * portion of an operand, a diagnostic message be written to standard 402 * error and nothing more be done with such operands. 403 * 404 * Since POSIX.2 defines basename as the final portion of a path after 405 * trailing slashes have been removed, we'll remove them here. 406 */ 407 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 408 void 409 checkdot(char **argv) 410 { 411 char *p, **save, **t; 412 int complained; 413 414 complained = 0; 415 for (t = argv; *t;) { 416 /* strip trailing slashes */ 417 p = strrchr(*t, '\0'); 418 while (--p > *t && *p == '/') 419 *p = '\0'; 420 421 /* extract basename */ 422 if ((p = strrchr(*t, '/')) != NULL) 423 ++p; 424 else 425 p = *t; 426 427 if (ISDOT(p)) { 428 if (!complained++) 429 warnx("\".\" and \"..\" may not be removed"); 430 eval = 1; 431 for (save = t; (t[0] = t[1]) != NULL; ++t) 432 continue; 433 t = save; 434 } else 435 ++t; 436 } 437 } 438 439 void 440 usage(void) 441 { 442 443 (void)fprintf(stderr, "usage: %s [-f|-i] [-dPRrvW] file ...\n", 444 getprogname()); 445 exit(1); 446 /* NOTREACHED */ 447 } 448
Indexes created Mon Sep 29 21:09:56 GMT 2025