rm.c revision 1.29
1 /* $NetBSD: rm.c,v 1.29 2001/12/20 20:10:34 soren 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 1.29 2001/12/20 20:10:34 soren 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, 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, "dfiPRrW")) != -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 'W': 120 Wflag = 1; 121 break; 122 case '?': 123 default: 124 usage(); 125 } 126 argc -= optind; 127 argv += optind; 128 129 if (argc < 1) 130 usage(); 131 132 checkdot(argv); 133 134 if (*argv) { 135 stdin_ok = isatty(STDIN_FILENO); 136 137 if (rflag) 138 rm_tree(argv); 139 else 140 rm_file(argv); 141 } 142 143 exit(eval); 144 /* NOTREACHED */ 145 } 146 147 void 148 rm_tree(char **argv) 149 { 150 FTS *fts; 151 FTSENT *p; 152 int flags, needstat; 153 154 /* 155 * Remove a file hierarchy. If forcing removal (-f), or interactive 156 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 157 */ 158 needstat = !fflag && !iflag && stdin_ok; 159 160 /* 161 * If the -i option is specified, the user can skip on the pre-order 162 * visit. The fts_number field flags skipped directories. 163 */ 164 #define SKIPPED 1 165 166 flags = FTS_PHYSICAL; 167 if (!needstat) 168 flags |= FTS_NOSTAT; 169 if (Wflag) 170 flags |= FTS_WHITEOUT; 171 if (!(fts = fts_open(argv, flags, 172 (int (*) __P((const FTSENT **, const FTSENT **)))NULL))) 173 err(1, NULL); 174 while ((p = fts_read(fts)) != NULL) { 175 switch (p->fts_info) { 176 case FTS_DNR: 177 if (!fflag || p->fts_errno != ENOENT) { 178 warnx("%s: %s", 179 p->fts_path, strerror(p->fts_errno)); 180 eval = 1; 181 } 182 continue; 183 case FTS_ERR: 184 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 185 /* NOTREACHED */ 186 case FTS_NS: 187 /* 188 * FTS_NS: assume that if can't stat the file, it 189 * can't be unlinked. 190 */ 191 if (fflag && NONEXISTENT(p->fts_errno)) 192 continue; 193 if (needstat) { 194 warnx("%s: %s", 195 p->fts_path, strerror(p->fts_errno)); 196 eval = 1; 197 continue; 198 } 199 break; 200 case FTS_D: 201 /* Pre-order: give user chance to skip. */ 202 if (!fflag && !check(p->fts_path, p->fts_accpath, 203 p->fts_statp)) { 204 (void)fts_set(fts, p, FTS_SKIP); 205 p->fts_number = SKIPPED; 206 } 207 continue; 208 case FTS_DP: 209 /* Post-order: see if user skipped. */ 210 if (p->fts_number == SKIPPED) 211 continue; 212 break; 213 default: 214 if (!fflag && 215 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 216 continue; 217 } 218 219 /* 220 * If we can't read or search the directory, may still be 221 * able to remove it. Don't print out the un{read,search}able 222 * message unless the remove fails. 223 */ 224 switch (p->fts_info) { 225 case FTS_DP: 226 case FTS_DNR: 227 if (!rmdir(p->fts_accpath) || 228 (fflag && errno == ENOENT)) 229 continue; 230 break; 231 232 case FTS_W: 233 if (!undelete(p->fts_accpath) || 234 (fflag && errno == ENOENT)) 235 continue; 236 break; 237 238 default: 239 if (Pflag) 240 rm_overwrite(p->fts_accpath, NULL); 241 if (!unlink(p->fts_accpath) || 242 (fflag && NONEXISTENT(errno))) 243 continue; 244 } 245 warn("%s", p->fts_path); 246 eval = 1; 247 } 248 if (errno) 249 err(1, "fts_read"); 250 } 251 252 void 253 rm_file(char **argv) 254 { 255 struct stat sb; 256 int rval; 257 char *f; 258 259 /* 260 * Remove a file. POSIX 1003.2 states that, by default, attempting 261 * to remove a directory is an error, so must always stat the file. 262 */ 263 while ((f = *argv++) != NULL) { 264 /* Assume if can't stat the file, can't unlink it. */ 265 if (lstat(f, &sb)) { 266 if (Wflag) { 267 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 268 } else { 269 if (!fflag || !NONEXISTENT(errno)) { 270 warn("%s", f); 271 eval = 1; 272 } 273 continue; 274 } 275 } else if (Wflag) { 276 warnx("%s: %s", f, strerror(EEXIST)); 277 eval = 1; 278 continue; 279 } 280 281 if (S_ISDIR(sb.st_mode) && !dflag) { 282 warnx("%s: is a directory", f); 283 eval = 1; 284 continue; 285 } 286 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 287 continue; 288 if (S_ISWHT(sb.st_mode)) 289 rval = undelete(f); 290 else if (S_ISDIR(sb.st_mode)) 291 rval = rmdir(f); 292 else { 293 if (Pflag) 294 rm_overwrite(f, &sb); 295 rval = unlink(f); 296 } 297 if (rval && (!fflag || !NONEXISTENT(errno))) { 298 warn("%s", f); 299 eval = 1; 300 } 301 } 302 } 303 304 /* 305 * rm_overwrite -- 306 * Overwrite the file 3 times with varying bit patterns. 307 * 308 * XXX 309 * This is a cheap way to *really* delete files. Note that only regular 310 * files are deleted, directories (and therefore names) will remain. 311 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 312 * System V file system). In a logging file system, you'll have to have 313 * kernel support. 314 */ 315 void 316 rm_overwrite(char *file, struct stat *sbp) 317 { 318 struct stat sb; 319 off_t len; 320 int fd, wlen; 321 char buf[8 * 1024]; 322 323 fd = -1; 324 if (sbp == NULL) { 325 if (lstat(file, &sb)) 326 goto err; 327 sbp = &sb; 328 } 329 if (!S_ISREG(sbp->st_mode)) 330 return; 331 if ((fd = open(file, O_WRONLY, 0)) == -1) 332 goto err; 333 334 #define PASS(byte) { \ 335 memset(buf, byte, sizeof(buf)); \ 336 for (len = sbp->st_size; len > 0; len -= wlen) { \ 337 wlen = len < sizeof(buf) ? len : sizeof(buf); \ 338 if (write(fd, buf, wlen) != wlen) \ 339 goto err; \ 340 } \ 341 } 342 PASS(0xff); 343 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 344 goto err; 345 PASS(0x00); 346 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 347 goto err; 348 PASS(0xff); 349 if (!fsync(fd) && !close(fd)) 350 return; 351 352 err: eval = 1; 353 warn("%s", file); 354 } 355 356 357 int 358 check(char *path, char *name, struct stat *sp) 359 { 360 int ch, first; 361 char modep[15]; 362 363 /* Check -i first. */ 364 if (iflag) 365 (void)fprintf(stderr, "remove %s? ", path); 366 else { 367 /* 368 * If it's not a symbolic link and it's unwritable and we're 369 * talking to a terminal, ask. Symbolic links are excluded 370 * because their permissions are meaningless. Check stdin_ok 371 * first because we may not have stat'ed the file. 372 */ 373 if (!stdin_ok || S_ISLNK(sp->st_mode) || 374 !(access(name, W_OK) && (errno != ETXTBSY))) 375 return (1); 376 strmode(sp->st_mode, modep); 377 (void)fprintf(stderr, "override %s%s%s/%s for %s? ", 378 modep + 1, modep[9] == ' ' ? "" : " ", 379 user_from_uid(sp->st_uid, 0), 380 group_from_gid(sp->st_gid, 0), path); 381 } 382 (void)fflush(stderr); 383 384 first = ch = getchar(); 385 while (ch != '\n' && ch != EOF) 386 ch = getchar(); 387 return (first == 'y' || first == 'Y'); 388 } 389 390 /* 391 * POSIX.2 requires that if "." or ".." are specified as the basename 392 * portion of an operand, a diagnostic message be written to standard 393 * error and nothing more be done with such operands. 394 * 395 * Since POSIX.2 defines basename as the final portion of a path after 396 * trailing slashes have been removed, we'll remove them here. 397 */ 398 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 399 void 400 checkdot(char **argv) 401 { 402 char *p, **save, **t; 403 int complained; 404 405 complained = 0; 406 for (t = argv; *t;) { 407 /* strip trailing slashes */ 408 p = strrchr (*t, '\0'); 409 while (--p > *t && *p == '/') 410 *p = '\0'; 411 412 /* extract basename */ 413 if ((p = strrchr(*t, '/')) != NULL) 414 ++p; 415 else 416 p = *t; 417 418 if (ISDOT(p)) { 419 if (!complained++) 420 warnx("\".\" and \"..\" may not be removed"); 421 eval = 1; 422 for (save = t; (t[0] = t[1]) != NULL; ++t) 423 continue; 424 t = save; 425 } else 426 ++t; 427 } 428 } 429 430 void 431 usage(void) 432 { 433 (void)fprintf(stderr, "usage: %s [-f|-i] [-dPRrW] file ...\n", 434 getprogname()); 435 exit(1); 436 /* NOTREACHED */ 437 } 438
Indexes created Thu Sep 25 16:09:42 GMT 2025