rm.c revision 1.22
1 /* $NetBSD: rm.c,v 1.22 1998/07/28 04:01:03 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 1.22 1998/07/28 04:01:03 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 /* 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 } 146 147 void 148 rm_tree(argv) 149 char **argv; 150 { 151 FTS *fts; 152 FTSENT *p; 153 int needstat; 154 int flags; 155 156 /* 157 * Remove a file hierarchy. If forcing removal (-f), or interactive 158 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 159 */ 160 needstat = !fflag && !iflag && stdin_ok; 161 162 /* 163 * If the -i option is specified, the user can skip on the pre-order 164 * visit. The fts_number field flags skipped directories. 165 */ 166 #define SKIPPED 1 167 168 flags = FTS_PHYSICAL; 169 if (!needstat) 170 flags |= FTS_NOSTAT; 171 if (Wflag) 172 flags |= FTS_WHITEOUT; 173 if (!(fts = fts_open(argv, flags, 174 (int (*) __P((const FTSENT **, const FTSENT **)))NULL))) 175 err(1, "%s", ""); 176 while ((p = fts_read(fts)) != NULL) { 177 switch (p->fts_info) { 178 case FTS_DNR: 179 if (!fflag || p->fts_errno != ENOENT) { 180 warnx("%s: %s", 181 p->fts_path, strerror(p->fts_errno)); 182 eval = 1; 183 } 184 continue; 185 case FTS_ERR: 186 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 187 case FTS_NS: 188 /* 189 * FTS_NS: assume that if can't stat the file, it 190 * can't be unlinked. 191 */ 192 if (!needstat) 193 break; 194 if (!fflag || !NONEXISTENT(p->fts_errno)) { 195 warnx("%s: %s", 196 p->fts_path, strerror(p->fts_errno)); 197 eval = 1; 198 } 199 continue; 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(argv) 254 char **argv; 255 { 256 struct stat sb; 257 int rval; 258 char *f; 259 260 /* 261 * Remove a file. POSIX 1003.2 states that, by default, attempting 262 * to remove a directory is an error, so must always stat the file. 263 */ 264 while ((f = *argv++) != NULL) { 265 /* Assume if can't stat the file, can't unlink it. */ 266 if (lstat(f, &sb)) { 267 if (Wflag) { 268 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 269 } else { 270 if (!fflag || !NONEXISTENT(errno)) { 271 warn("%s", f); 272 eval = 1; 273 } 274 continue; 275 } 276 } else if (Wflag) { 277 warnx("%s: %s", f, strerror(EEXIST)); 278 eval = 1; 279 continue; 280 } 281 282 if (S_ISDIR(sb.st_mode) && !dflag) { 283 warnx("%s: is a directory", f); 284 eval = 1; 285 continue; 286 } 287 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 288 continue; 289 if (S_ISWHT(sb.st_mode)) 290 rval = undelete(f); 291 else if (S_ISDIR(sb.st_mode)) 292 rval = rmdir(f); 293 else { 294 if (Pflag) 295 rm_overwrite(f, &sb); 296 rval = unlink(f); 297 } 298 if (rval && (!fflag || !NONEXISTENT(errno))) { 299 warn("%s", f); 300 eval = 1; 301 } 302 } 303 } 304 305 /* 306 * rm_overwrite -- 307 * Overwrite the file 3 times with varying bit patterns. 308 * 309 * XXX 310 * This is a cheap way to *really* delete files. Note that only regular 311 * files are deleted, directories (and therefore names) will remain. 312 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 313 * System V file system). In a logging file system, you'll have to have 314 * kernel support. 315 */ 316 void 317 rm_overwrite(file, sbp) 318 char *file; 319 struct stat *sbp; 320 { 321 struct stat sb; 322 off_t len; 323 int fd, wlen; 324 char buf[8 * 1024]; 325 326 fd = -1; 327 if (sbp == NULL) { 328 if (lstat(file, &sb)) 329 goto err; 330 sbp = &sb; 331 } 332 if (!S_ISREG(sbp->st_mode)) 333 return; 334 if ((fd = open(file, O_WRONLY, 0)) == -1) 335 goto err; 336 337 #define PASS(byte) { \ 338 memset(buf, byte, sizeof(buf)); \ 339 for (len = sbp->st_size; len > 0; len -= wlen) { \ 340 wlen = len < sizeof(buf) ? len : sizeof(buf); \ 341 if (write(fd, buf, wlen) != wlen) \ 342 goto err; \ 343 } \ 344 } 345 PASS(0xff); 346 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 347 goto err; 348 PASS(0x00); 349 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 350 goto err; 351 PASS(0xff); 352 if (!fsync(fd) && !close(fd)) 353 return; 354 355 err: eval = 1; 356 warn("%s", file); 357 } 358 359 360 int 361 check(path, name, sp) 362 char *path, *name; 363 struct stat *sp; 364 { 365 int ch, first; 366 char modep[15]; 367 368 /* Check -i first. */ 369 if (iflag) 370 (void)fprintf(stderr, "remove %s? ", path); 371 else { 372 /* 373 * If it's not a symbolic link and it's unwritable and we're 374 * talking to a terminal, ask. Symbolic links are excluded 375 * because their permissions are meaningless. Check stdin_ok 376 * first because we may not have stat'ed the file. 377 */ 378 if (!stdin_ok || S_ISLNK(sp->st_mode) || !access(name, W_OK)) 379 return (1); 380 strmode(sp->st_mode, modep); 381 (void)fprintf(stderr, "override %s%s%s/%s for %s? ", 382 modep + 1, modep[9] == ' ' ? "" : " ", 383 user_from_uid(sp->st_uid, 0), 384 group_from_gid(sp->st_gid, 0), path); 385 } 386 (void)fflush(stderr); 387 388 first = ch = getchar(); 389 while (ch != '\n' && ch != EOF) 390 ch = getchar(); 391 return (first == 'y' || first == 'Y'); 392 } 393 394 /* 395 * POSIX.2 requires that if "." or ".." are specified as the basename 396 * portion of an operand, a diagnostic message be written to standard 397 * error and nothing more be done with such operands. 398 * 399 * Since POSIX.2 defines basename as the final portion of a path after 400 * trailing slashes have been removed, we'll remove them here. 401 */ 402 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 403 void 404 checkdot(argv) 405 char **argv; 406 { 407 char *p, **save, **t; 408 int complained; 409 410 complained = 0; 411 for (t = argv; *t;) { 412 /* strip trailing slashes */ 413 p = strrchr (*t, '\0'); 414 while (--p > *t && *p == '/') 415 *p = '\0'; 416 417 /* extract basename */ 418 if ((p = strrchr(*t, '/')) != NULL) 419 ++p; 420 else 421 p = *t; 422 423 if (ISDOT(p)) { 424 if (!complained++) 425 warnx("\".\" and \"..\" may not be removed"); 426 eval = 1; 427 for (save = t; (t[0] = t[1]) != NULL; ++t) 428 continue; 429 t = save; 430 } else 431 ++t; 432 } 433 } 434 435 void 436 usage() 437 { 438 439 (void)fprintf(stderr, "usage: rm [-dfiPRrW] file ...\n"); 440 exit(1); 441 } 442
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