rm.c revision 1.27
1 /* $NetBSD: rm.c,v 1.27 2001/09/16 21:24:54 wiz 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 1.27 2001/09/16 21:24:54 wiz 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 (!needstat) 192 break; 193 if (!fflag || !NONEXISTENT(p->fts_errno)) { 194 warnx("%s: %s", 195 p->fts_path, strerror(p->fts_errno)); 196 eval = 1; 197 } 198 continue; 199 case FTS_D: 200 /* Pre-order: give user chance to skip. */ 201 if (!fflag && !check(p->fts_path, p->fts_accpath, 202 p->fts_statp)) { 203 (void)fts_set(fts, p, FTS_SKIP); 204 p->fts_number = SKIPPED; 205 } 206 continue; 207 case FTS_DP: 208 /* Post-order: see if user skipped. */ 209 if (p->fts_number == SKIPPED) 210 continue; 211 break; 212 default: 213 if (!fflag && 214 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 215 continue; 216 } 217 218 /* 219 * If we can't read or search the directory, may still be 220 * able to remove it. Don't print out the un{read,search}able 221 * message unless the remove fails. 222 */ 223 switch (p->fts_info) { 224 case FTS_DP: 225 case FTS_DNR: 226 if (!rmdir(p->fts_accpath) || 227 (fflag && errno == ENOENT)) 228 continue; 229 break; 230 231 case FTS_W: 232 if (!undelete(p->fts_accpath) || 233 (fflag && errno == ENOENT)) 234 continue; 235 break; 236 237 default: 238 if (Pflag) 239 rm_overwrite(p->fts_accpath, NULL); 240 if (!unlink(p->fts_accpath) || 241 (fflag && NONEXISTENT(errno))) 242 continue; 243 } 244 warn("%s", p->fts_path); 245 eval = 1; 246 } 247 if (errno) 248 err(1, "fts_read"); 249 } 250 251 void 252 rm_file(char **argv) 253 { 254 struct stat sb; 255 int rval; 256 char *f; 257 258 /* 259 * Remove a file. POSIX 1003.2 states that, by default, attempting 260 * to remove a directory is an error, so must always stat the file. 261 */ 262 while ((f = *argv++) != NULL) { 263 /* Assume if can't stat the file, can't unlink it. */ 264 if (lstat(f, &sb)) { 265 if (Wflag) { 266 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 267 } else { 268 if (!fflag || !NONEXISTENT(errno)) { 269 warn("%s", f); 270 eval = 1; 271 } 272 continue; 273 } 274 } else if (Wflag) { 275 warnx("%s: %s", f, strerror(EEXIST)); 276 eval = 1; 277 continue; 278 } 279 280 if (S_ISDIR(sb.st_mode) && !dflag) { 281 warnx("%s: is a directory", f); 282 eval = 1; 283 continue; 284 } 285 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 286 continue; 287 if (S_ISWHT(sb.st_mode)) 288 rval = undelete(f); 289 else if (S_ISDIR(sb.st_mode)) 290 rval = rmdir(f); 291 else { 292 if (Pflag) 293 rm_overwrite(f, &sb); 294 rval = unlink(f); 295 } 296 if (rval && (!fflag || !NONEXISTENT(errno))) { 297 warn("%s", f); 298 eval = 1; 299 } 300 } 301 } 302 303 /* 304 * rm_overwrite -- 305 * Overwrite the file 3 times with varying bit patterns. 306 * 307 * XXX 308 * This is a cheap way to *really* delete files. Note that only regular 309 * files are deleted, directories (and therefore names) will remain. 310 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 311 * System V file system). In a logging file system, you'll have to have 312 * kernel support. 313 */ 314 void 315 rm_overwrite(char *file, struct stat *sbp) 316 { 317 struct stat sb; 318 off_t len; 319 int fd, wlen; 320 char buf[8 * 1024]; 321 322 fd = -1; 323 if (sbp == NULL) { 324 if (lstat(file, &sb)) 325 goto err; 326 sbp = &sb; 327 } 328 if (!S_ISREG(sbp->st_mode)) 329 return; 330 if ((fd = open(file, O_WRONLY, 0)) == -1) 331 goto err; 332 333 #define PASS(byte) { \ 334 memset(buf, byte, sizeof(buf)); \ 335 for (len = sbp->st_size; len > 0; len -= wlen) { \ 336 wlen = len < sizeof(buf) ? len : sizeof(buf); \ 337 if (write(fd, buf, wlen) != wlen) \ 338 goto err; \ 339 } \ 340 } 341 PASS(0xff); 342 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 343 goto err; 344 PASS(0x00); 345 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 346 goto err; 347 PASS(0xff); 348 if (!fsync(fd) && !close(fd)) 349 return; 350 351 err: eval = 1; 352 warn("%s", file); 353 } 354 355 356 int 357 check(char *path, char *name, struct stat *sp) 358 { 359 int ch, first; 360 char modep[15]; 361 362 /* Check -i first. */ 363 if (iflag) 364 (void)fprintf(stderr, "remove %s? ", path); 365 else { 366 /* 367 * If it's not a symbolic link and it's unwritable and we're 368 * talking to a terminal, ask. Symbolic links are excluded 369 * because their permissions are meaningless. Check stdin_ok 370 * first because we may not have stat'ed the file. 371 */ 372 if (!stdin_ok || S_ISLNK(sp->st_mode) || 373 !(access(name, W_OK) && (errno != ETXTBSY))) 374 return (1); 375 strmode(sp->st_mode, modep); 376 (void)fprintf(stderr, "override %s%s%s/%s for %s? ", 377 modep + 1, modep[9] == ' ' ? "" : " ", 378 user_from_uid(sp->st_uid, 0), 379 group_from_gid(sp->st_gid, 0), path); 380 } 381 (void)fflush(stderr); 382 383 first = ch = getchar(); 384 while (ch != '\n' && ch != EOF) 385 ch = getchar(); 386 return (first == 'y' || first == 'Y'); 387 } 388 389 /* 390 * POSIX.2 requires that if "." or ".." are specified as the basename 391 * portion of an operand, a diagnostic message be written to standard 392 * error and nothing more be done with such operands. 393 * 394 * Since POSIX.2 defines basename as the final portion of a path after 395 * trailing slashes have been removed, we'll remove them here. 396 */ 397 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 398 void 399 checkdot(char **argv) 400 { 401 char *p, **save, **t; 402 int complained; 403 404 complained = 0; 405 for (t = argv; *t;) { 406 /* strip trailing slashes */ 407 p = strrchr (*t, '\0'); 408 while (--p > *t && *p == '/') 409 *p = '\0'; 410 411 /* extract basename */ 412 if ((p = strrchr(*t, '/')) != NULL) 413 ++p; 414 else 415 p = *t; 416 417 if (ISDOT(p)) { 418 if (!complained++) 419 warnx("\".\" and \"..\" may not be removed"); 420 eval = 1; 421 for (save = t; (t[0] = t[1]) != NULL; ++t) 422 continue; 423 t = save; 424 } else 425 ++t; 426 } 427 } 428 429 void 430 usage(void) 431 { 432 (void)fprintf(stderr, "usage: %s [-dfiPRrW] file ...\n", getprogname()); 433 exit(1); 434 /* NOTREACHED */ 435 } 436
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