1 /* $NetBSD: rm.c,v 1.19 1995/09/07 06:48:50 jtc 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 #ifndef lint 37 static char copyright[] = 38 "@(#) 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 static char rcsid[] = "$NetBSD: rm.c,v 1.19 1995/09/07 06:48:50 jtc 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 63 int dflag, eval, fflag, iflag, Pflag, Wflag, stdin_ok; 64 65 int check __P((char *, char *, struct stat *)); 66 void checkdot __P((char **)); 67 void rm_file __P((char **)); 68 void rm_overwrite __P((char *, struct stat *)); 69 void rm_tree __P((char **)); 70 void usage __P((void)); 71 72 /* 73 * rm -- 74 * This rm is different from historic rm's, but is expected to match 75 * POSIX 1003.2 behavior. The most visible difference is that -f 76 * has two specific effects now, ignore non-existent files and force 77 * file removal. 78 */ 79 int 80 main(argc, argv) 81 int argc; 82 char *argv[]; 83 { 84 int ch, rflag; 85 86 setlocale(LC_ALL, ""); 87 88 Pflag = rflag = 0; 89 while ((ch = getopt(argc, argv, "dfiPRrW")) != -1) 90 switch(ch) { 91 case 'd': 92 dflag = 1; 93 break; 94 case 'f': 95 fflag = 1; 96 iflag = 0; 97 break; 98 case 'i': 99 fflag = 0; 100 iflag = 1; 101 break; 102 case 'P': 103 Pflag = 1; 104 break; 105 case 'R': 106 case 'r': /* Compatibility. */ 107 rflag = 1; 108 break; 109 case 'W': 110 Wflag = 1; 111 break; 112 case '?': 113 default: 114 usage(); 115 } 116 argc -= optind; 117 argv += optind; 118 119 if (argc < 1) 120 usage(); 121 122 checkdot(argv); 123 124 if (*argv) { 125 stdin_ok = isatty(STDIN_FILENO); 126 127 if (rflag) 128 rm_tree(argv); 129 else 130 rm_file(argv); 131 } 132 133 exit (eval); 134 } 135 136 void 137 rm_tree(argv) 138 char **argv; 139 { 140 FTS *fts; 141 FTSENT *p; 142 int needstat; 143 int flags; 144 145 /* 146 * Remove a file hierarchy. If forcing removal (-f), or interactive 147 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 148 */ 149 needstat = !fflag && !iflag && stdin_ok; 150 151 /* 152 * If the -i option is specified, the user can skip on the pre-order 153 * visit. The fts_number field flags skipped directories. 154 */ 155 #define SKIPPED 1 156 157 flags = FTS_PHYSICAL; 158 if (!needstat) 159 flags |= FTS_NOSTAT; 160 if (Wflag) 161 flags |= FTS_WHITEOUT; 162 if (!(fts = fts_open(argv, flags, (int (*)())NULL))) 163 err(1, NULL); 164 while ((p = fts_read(fts)) != NULL) { 165 switch (p->fts_info) { 166 case FTS_DNR: 167 if (!fflag || p->fts_errno != ENOENT) { 168 warnx("%s: %s", 169 p->fts_path, strerror(p->fts_errno)); 170 eval = 1; 171 } 172 continue; 173 case FTS_ERR: 174 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 175 case FTS_NS: 176 /* 177 * FTS_NS: assume that if can't stat the file, it 178 * can't be unlinked. 179 */ 180 if (!needstat) 181 break; 182 if (!fflag || p->fts_errno != ENOENT) { 183 warnx("%s: %s", 184 p->fts_path, strerror(p->fts_errno)); 185 eval = 1; 186 } 187 continue; 188 case FTS_D: 189 /* Pre-order: give user chance to skip. */ 190 if (!fflag && !check(p->fts_path, p->fts_accpath, 191 p->fts_statp)) { 192 (void)fts_set(fts, p, FTS_SKIP); 193 p->fts_number = SKIPPED; 194 } 195 continue; 196 case FTS_DP: 197 /* Post-order: see if user skipped. */ 198 if (p->fts_number == SKIPPED) 199 continue; 200 break; 201 default: 202 if (!fflag && 203 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 204 continue; 205 } 206 207 /* 208 * If we can't read or search the directory, may still be 209 * able to remove it. Don't print out the un{read,search}able 210 * message unless the remove fails. 211 */ 212 switch (p->fts_info) { 213 case FTS_DP: 214 case FTS_DNR: 215 if (!rmdir(p->fts_accpath) || fflag && errno == ENOENT) 216 continue; 217 break; 218 219 case FTS_W: 220 if (!undelete(p->fts_accpath) || 221 fflag && errno == ENOENT) 222 continue; 223 break; 224 225 default: 226 if (Pflag) 227 rm_overwrite(p->fts_accpath, NULL); 228 if (!unlink(p->fts_accpath) || fflag && errno == ENOENT) 229 continue; 230 } 231 warn("%s", p->fts_path); 232 eval = 1; 233 } 234 if (errno) 235 err(1, "fts_read"); 236 } 237 238 void 239 rm_file(argv) 240 char **argv; 241 { 242 struct stat sb; 243 int rval; 244 char *f; 245 246 /* 247 * Remove a file. POSIX 1003.2 states that, by default, attempting 248 * to remove a directory is an error, so must always stat the file. 249 */ 250 while ((f = *argv++) != NULL) { 251 /* Assume if can't stat the file, can't unlink it. */ 252 if (lstat(f, &sb)) { 253 if (Wflag) { 254 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 255 } else { 256 if (!fflag || errno != ENOENT) { 257 warn("%s", f); 258 eval = 1; 259 } 260 continue; 261 } 262 } else if (Wflag) { 263 warnx("%s: %s", f, strerror(EEXIST)); 264 eval = 1; 265 continue; 266 } 267 268 if (S_ISDIR(sb.st_mode) && !dflag) { 269 warnx("%s: is a directory", f); 270 eval = 1; 271 continue; 272 } 273 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 274 continue; 275 if (S_ISWHT(sb.st_mode)) 276 rval = undelete(f); 277 else if (S_ISDIR(sb.st_mode)) 278 rval = rmdir(f); 279 else { 280 if (Pflag) 281 rm_overwrite(f, &sb); 282 rval = unlink(f); 283 } 284 if (rval && (!fflag || errno != ENOENT)) { 285 warn("%s", f); 286 eval = 1; 287 } 288 } 289 } 290 291 /* 292 * rm_overwrite -- 293 * Overwrite the file 3 times with varying bit patterns. 294 * 295 * XXX 296 * This is a cheap way to *really* delete files. Note that only regular 297 * files are deleted, directories (and therefore names) will remain. 298 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 299 * System V file system). In a logging file system, you'll have to have 300 * kernel support. 301 */ 302 void 303 rm_overwrite(file, sbp) 304 char *file; 305 struct stat *sbp; 306 { 307 struct stat sb; 308 off_t len; 309 int fd, wlen; 310 char buf[8 * 1024]; 311 312 fd = -1; 313 if (sbp == NULL) { 314 if (lstat(file, &sb)) 315 goto err; 316 sbp = &sb; 317 } 318 if (!S_ISREG(sbp->st_mode)) 319 return; 320 if ((fd = open(file, O_WRONLY, 0)) == -1) 321 goto err; 322 323 #define PASS(byte) { \ 324 memset(buf, byte, sizeof(buf)); \ 325 for (len = sbp->st_size; len > 0; len -= wlen) { \ 326 wlen = len < sizeof(buf) ? len : sizeof(buf); \ 327 if (write(fd, buf, wlen) != wlen) \ 328 goto err; \ 329 } \ 330 } 331 PASS(0xff); 332 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 333 goto err; 334 PASS(0x00); 335 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 336 goto err; 337 PASS(0xff); 338 if (!fsync(fd) && !close(fd)) 339 return; 340 341 err: eval = 1; 342 warn("%s", file); 343 } 344 345 346 int 347 check(path, name, sp) 348 char *path, *name; 349 struct stat *sp; 350 { 351 int ch, first; 352 char modep[15]; 353 354 /* Check -i first. */ 355 if (iflag) 356 (void)fprintf(stderr, "remove %s? ", path); 357 else { 358 /* 359 * If it's not a symbolic link and it's unwritable and we're 360 * talking to a terminal, ask. Symbolic links are excluded 361 * because their permissions are meaningless. Check stdin_ok 362 * first because we may not have stat'ed the file. 363 */ 364 if (!stdin_ok || S_ISLNK(sp->st_mode) || !access(name, W_OK)) 365 return (1); 366 strmode(sp->st_mode, modep); 367 (void)fprintf(stderr, "override %s%s%s/%s for %s? ", 368 modep + 1, modep[9] == ' ' ? "" : " ", 369 user_from_uid(sp->st_uid, 0), 370 group_from_gid(sp->st_gid, 0), path); 371 } 372 (void)fflush(stderr); 373 374 first = ch = getchar(); 375 while (ch != '\n' && ch != EOF) 376 ch = getchar(); 377 return (first == 'y' || first == 'Y'); 378 } 379 380 /* 381 * POSIX.2 requires that if "." or ".." are specified as the basename 382 * portion of an operand, a diagnostic message be written to standard 383 * error and nothing more be done with such operands. 384 * 385 * Since POSIX.2 defines basename as the final portion of a path after 386 * trailing slashes have been removed, we'll remove them here. 387 */ 388 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || (a)[1] == '.' && !(a)[2])) 389 void 390 checkdot(argv) 391 char **argv; 392 { 393 char *p, **save, **t; 394 int complained; 395 396 complained = 0; 397 for (t = argv; *t;) { 398 /* strip trailing slashes */ 399 p = strrchr (*t, '\0'); 400 while (--p > *t && *p == '/') 401 *p = '\0'; 402 403 /* extract basename */ 404 if ((p = strrchr(*t, '/')) != NULL) 405 ++p; 406 else 407 p = *t; 408 409 if (ISDOT(p)) { 410 if (!complained++) 411 warnx("\".\" and \"..\" may not be removed"); 412 eval = 1; 413 for (save = t; (t[0] = t[1]) != NULL; ++t) 414 continue; 415 t = save; 416 } else 417 ++t; 418 } 419 } 420 421 void 422 usage() 423 { 424 425 (void)fprintf(stderr, "usage: rm [-dfiPRrW] file ...\n"); 426 exit(1); 427 } 428