rm.c revision 1.26.4.1
1 /* $NetBSD: rm.c,v 1.26.4.1 2002/03/06 22:28:00 he 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 1.26.4.1 2002/03/06 22:28:00 he 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 /* 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(argc, argv) 92 int argc; 93 char *argv[]; 94 { 95 int ch, rflag; 96 97 (void)setlocale(LC_ALL, ""); 98 99 Pflag = rflag = 0; 100 while ((ch = getopt(argc, argv, "dfiPRrW")) != -1) 101 switch(ch) { 102 case 'd': 103 dflag = 1; 104 break; 105 case 'f': 106 fflag = 1; 107 iflag = 0; 108 break; 109 case 'i': 110 fflag = 0; 111 iflag = 1; 112 break; 113 case 'P': 114 Pflag = 1; 115 break; 116 case 'R': 117 case 'r': /* Compatibility. */ 118 rflag = 1; 119 break; 120 case 'W': 121 Wflag = 1; 122 break; 123 case '?': 124 default: 125 usage(); 126 } 127 argc -= optind; 128 argv += optind; 129 130 if (argc < 1) 131 usage(); 132 133 checkdot(argv); 134 135 if (*argv) { 136 stdin_ok = isatty(STDIN_FILENO); 137 138 if (rflag) 139 rm_tree(argv); 140 else 141 rm_file(argv); 142 } 143 144 exit(eval); 145 /* NOTREACHED */ 146 } 147 148 void 149 rm_tree(argv) 150 char **argv; 151 { 152 FTS *fts; 153 FTSENT *p; 154 int needstat; 155 int flags; 156 157 /* 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 (*) __P((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 /* 223 * If we can't read or search the directory, may still be 224 * able to remove it. Don't print out the un{read,search}able 225 * message unless the remove fails. 226 */ 227 switch (p->fts_info) { 228 case FTS_DP: 229 case FTS_DNR: 230 if (!rmdir(p->fts_accpath) || 231 (fflag && errno == ENOENT)) 232 continue; 233 break; 234 235 case FTS_W: 236 if (!undelete(p->fts_accpath) || 237 (fflag && errno == ENOENT)) 238 continue; 239 break; 240 241 default: 242 if (Pflag) 243 rm_overwrite(p->fts_accpath, NULL); 244 if (!unlink(p->fts_accpath) || 245 (fflag && NONEXISTENT(errno))) 246 continue; 247 } 248 warn("%s", p->fts_path); 249 eval = 1; 250 } 251 if (errno) 252 err(1, "fts_read"); 253 } 254 255 void 256 rm_file(argv) 257 char **argv; 258 { 259 struct stat sb; 260 int rval; 261 char *f; 262 263 /* 264 * Remove a file. POSIX 1003.2 states that, by default, attempting 265 * to remove a directory is an error, so must always stat the file. 266 */ 267 while ((f = *argv++) != NULL) { 268 /* Assume if can't stat the file, can't unlink it. */ 269 if (lstat(f, &sb)) { 270 if (Wflag) { 271 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 272 } else { 273 if (!fflag || !NONEXISTENT(errno)) { 274 warn("%s", f); 275 eval = 1; 276 } 277 continue; 278 } 279 } else if (Wflag) { 280 warnx("%s: %s", f, strerror(EEXIST)); 281 eval = 1; 282 continue; 283 } 284 285 if (S_ISDIR(sb.st_mode) && !dflag) { 286 warnx("%s: is a directory", f); 287 eval = 1; 288 continue; 289 } 290 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 291 continue; 292 if (S_ISWHT(sb.st_mode)) 293 rval = undelete(f); 294 else if (S_ISDIR(sb.st_mode)) 295 rval = rmdir(f); 296 else { 297 if (Pflag) 298 rm_overwrite(f, &sb); 299 rval = unlink(f); 300 } 301 if (rval && (!fflag || !NONEXISTENT(errno))) { 302 warn("%s", f); 303 eval = 1; 304 } 305 } 306 } 307 308 /* 309 * rm_overwrite -- 310 * Overwrite the file 3 times with varying bit patterns. 311 * 312 * XXX 313 * This is a cheap way to *really* delete files. Note that only regular 314 * files are deleted, directories (and therefore names) will remain. 315 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 316 * System V file system). In a logging file system, you'll have to have 317 * kernel support. 318 */ 319 void 320 rm_overwrite(file, sbp) 321 char *file; 322 struct stat *sbp; 323 { 324 struct stat sb; 325 off_t len; 326 int fd, wlen; 327 char buf[8 * 1024]; 328 329 fd = -1; 330 if (sbp == NULL) { 331 if (lstat(file, &sb)) 332 goto err; 333 sbp = &sb; 334 } 335 if (!S_ISREG(sbp->st_mode)) 336 return; 337 if ((fd = open(file, O_WRONLY, 0)) == -1) 338 goto err; 339 340 #define PASS(byte) { \ 341 memset(buf, byte, sizeof(buf)); \ 342 for (len = sbp->st_size; len > 0; len -= wlen) { \ 343 wlen = len < sizeof(buf) ? len : sizeof(buf); \ 344 if (write(fd, buf, wlen) != wlen) \ 345 goto err; \ 346 } \ 347 } 348 PASS(0xff); 349 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 350 goto err; 351 PASS(0x00); 352 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 353 goto err; 354 PASS(0xff); 355 if (!fsync(fd) && !close(fd)) 356 return; 357 358 err: eval = 1; 359 warn("%s", file); 360 } 361 362 363 int 364 check(path, name, sp) 365 char *path, *name; 366 struct stat *sp; 367 { 368 int ch, first; 369 char modep[15]; 370 371 /* Check -i first. */ 372 if (iflag) 373 (void)fprintf(stderr, "remove %s? ", path); 374 else { 375 /* 376 * If it's not a symbolic link and it's unwritable and we're 377 * talking to a terminal, ask. Symbolic links are excluded 378 * because their permissions are meaningless. Check stdin_ok 379 * first because we may not have stat'ed the file. 380 */ 381 if (!stdin_ok || S_ISLNK(sp->st_mode) || 382 !(access(name, W_OK) && (errno != ETXTBSY))) 383 return (1); 384 strmode(sp->st_mode, modep); 385 (void)fprintf(stderr, "override %s%s%s/%s for %s? ", 386 modep + 1, modep[9] == ' ' ? "" : " ", 387 user_from_uid(sp->st_uid, 0), 388 group_from_gid(sp->st_gid, 0), path); 389 } 390 (void)fflush(stderr); 391 392 first = ch = getchar(); 393 while (ch != '\n' && ch != EOF) 394 ch = getchar(); 395 return (first == 'y' || first == 'Y'); 396 } 397 398 /* 399 * POSIX.2 requires that if "." or ".." are specified as the basename 400 * portion of an operand, a diagnostic message be written to standard 401 * error and nothing more be done with such operands. 402 * 403 * Since POSIX.2 defines basename as the final portion of a path after 404 * trailing slashes have been removed, we'll remove them here. 405 */ 406 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 407 void 408 checkdot(argv) 409 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() 441 { 442 443 (void)fprintf(stderr, "usage: rm [-dfiPRrW] file ...\n"); 444 exit(1); 445 /* NOTREACHED */ 446 } 447
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