rm.c revision 1.1.1.2
1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1990, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/stat.h> 46 47 #include <err.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <fts.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 int dflag, eval, fflag, iflag, Pflag, stdin_ok; 57 58 int check __P((char *, char *, struct stat *)); 59 void checkdot __P((char **)); 60 void rm_file __P((char **)); 61 void rm_overwrite __P((char *, struct stat *)); 62 void rm_tree __P((char **)); 63 void usage __P((void)); 64 65 /* 66 * rm -- 67 * This rm is different from historic rm's, but is expected to match 68 * POSIX 1003.2 behavior. The most visible difference is that -f 69 * has two specific effects now, ignore non-existent files and force 70 * file removal. 71 */ 72 int 73 main(argc, argv) 74 int argc; 75 char *argv[]; 76 { 77 int ch, rflag; 78 79 Pflag = rflag = 0; 80 while ((ch = getopt(argc, argv, "dfiPRr")) != EOF) 81 switch(ch) { 82 case 'd': 83 dflag = 1; 84 break; 85 case 'f': 86 fflag = 1; 87 iflag = 0; 88 break; 89 case 'i': 90 fflag = 0; 91 iflag = 1; 92 break; 93 case 'P': 94 Pflag = 1; 95 break; 96 case 'R': 97 case 'r': /* Compatibility. */ 98 rflag = 1; 99 break; 100 case '?': 101 default: 102 usage(); 103 } 104 argc -= optind; 105 argv += optind; 106 107 if (argc < 1) 108 usage(); 109 110 checkdot(argv); 111 if (!*argv) 112 exit (eval); 113 114 stdin_ok = isatty(STDIN_FILENO); 115 116 if (rflag) 117 rm_tree(argv); 118 else 119 rm_file(argv); 120 exit (eval); 121 } 122 123 void 124 rm_tree(argv) 125 char **argv; 126 { 127 FTS *fts; 128 FTSENT *p; 129 int needstat; 130 131 /* 132 * Remove a file hierarchy. If forcing removal (-f), or interactive 133 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 134 */ 135 needstat = !fflag && !iflag && stdin_ok; 136 137 /* 138 * If the -i option is specified, the user can skip on the pre-order 139 * visit. The fts_number field flags skipped directories. 140 */ 141 #define SKIPPED 1 142 143 if (!(fts = fts_open(argv, 144 needstat ? FTS_PHYSICAL : FTS_PHYSICAL|FTS_NOSTAT, 145 (int (*)())NULL))) 146 err(1, NULL); 147 while ((p = fts_read(fts)) != NULL) { 148 switch (p->fts_info) { 149 case FTS_DNR: 150 if (!fflag || p->fts_errno != ENOENT) { 151 warnx("%s: %s", 152 p->fts_path, strerror(p->fts_errno)); 153 eval = 1; 154 } 155 continue; 156 case FTS_ERR: 157 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 158 case FTS_NS: 159 /* 160 * FTS_NS: assume that if can't stat the file, it 161 * can't be unlinked. 162 */ 163 if (!needstat) 164 break; 165 if (!fflag || p->fts_errno != ENOENT) { 166 warnx("%s: %s", 167 p->fts_path, strerror(p->fts_errno)); 168 eval = 1; 169 } 170 continue; 171 case FTS_D: 172 /* Pre-order: give user chance to skip. */ 173 if (iflag && !check(p->fts_path, p->fts_accpath, 174 p->fts_statp)) { 175 (void)fts_set(fts, p, FTS_SKIP); 176 p->fts_number = SKIPPED; 177 } 178 continue; 179 case FTS_DP: 180 /* Post-order: see if user skipped. */ 181 if (p->fts_number == SKIPPED) 182 continue; 183 break; 184 } 185 if (!fflag && 186 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 187 continue; 188 189 /* 190 * If we can't read or search the directory, may still be 191 * able to remove it. Don't print out the un{read,search}able 192 * message unless the remove fails. 193 */ 194 if (p->fts_info == FTS_DP || p->fts_info == FTS_DNR) { 195 if (!rmdir(p->fts_accpath)) 196 continue; 197 if (errno == ENOENT) { 198 if (fflag) 199 continue; 200 } else if (p->fts_info != FTS_DP) 201 warnx("%s: unable to read", p->fts_path); 202 } else { 203 if (Pflag) 204 rm_overwrite(p->fts_accpath, NULL); 205 if (!unlink(p->fts_accpath) || fflag && errno == ENOENT) 206 continue; 207 } 208 warn("%s", p->fts_path); 209 eval = 1; 210 } 211 if (errno) 212 err(1, "fts_read"); 213 } 214 215 void 216 rm_file(argv) 217 char **argv; 218 { 219 struct stat sb; 220 int df, rval; 221 char *f; 222 223 df = dflag; 224 /* 225 * Remove a file. POSIX 1003.2 states that, by default, attempting 226 * to remove a directory is an error, so must always stat the file. 227 */ 228 while ((f = *argv++) != NULL) { 229 /* Assume if can't stat the file, can't unlink it. */ 230 if (lstat(f, &sb)) { 231 if (!fflag || errno != ENOENT) { 232 warn("%s", f); 233 eval = 1; 234 } 235 continue; 236 } 237 if (S_ISDIR(sb.st_mode) && !df) { 238 warnx("%s: is a directory", f); 239 eval = 1; 240 continue; 241 } 242 if (!fflag && !check(f, f, &sb)) 243 continue; 244 if (S_ISDIR(sb.st_mode)) 245 rval = rmdir(f); 246 else { 247 if (Pflag) 248 rm_overwrite(f, &sb); 249 rval = unlink(f); 250 } 251 if (rval && (!fflag || errno != ENOENT)) { 252 warn("%s", f); 253 eval = 1; 254 } 255 } 256 } 257 258 /* 259 * rm_overwrite -- 260 * Overwrite the file 3 times with varying bit patterns. 261 * 262 * XXX 263 * This is a cheap way to *really* delete files. Note that only regular 264 * files are deleted, directories (and therefore names) will remain. 265 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 266 * System V file system). In a logging file system, you'll have to have 267 * kernel support. 268 */ 269 void 270 rm_overwrite(file, sbp) 271 char *file; 272 struct stat *sbp; 273 { 274 struct stat sb; 275 off_t len; 276 int fd, wlen; 277 char buf[8 * 1024]; 278 279 fd = -1; 280 if (sbp == NULL) { 281 if (lstat(file, &sb)) 282 goto err; 283 sbp = &sb; 284 } 285 if (!S_ISREG(sbp->st_mode)) 286 return; 287 if ((fd = open(file, O_WRONLY, 0)) == -1) 288 goto err; 289 290 #define PASS(byte) { \ 291 memset(buf, byte, sizeof(buf)); \ 292 for (len = sbp->st_size; len > 0; len -= wlen) { \ 293 wlen = len < sizeof(buf) ? len : sizeof(buf); \ 294 if (write(fd, buf, wlen) != wlen) \ 295 goto err; \ 296 } \ 297 } 298 PASS(0xff); 299 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 300 goto err; 301 PASS(0x00); 302 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 303 goto err; 304 PASS(0xff); 305 if (!fsync(fd) && !close(fd)) 306 return; 307 308 err: eval = 1; 309 warn("%s", file); 310 } 311 312 313 int 314 check(path, name, sp) 315 char *path, *name; 316 struct stat *sp; 317 { 318 int ch, first; 319 char modep[15]; 320 321 /* Check -i first. */ 322 if (iflag) 323 (void)fprintf(stderr, "remove %s? ", path); 324 else { 325 /* 326 * If it's not a symbolic link and it's unwritable and we're 327 * talking to a terminal, ask. Symbolic links are excluded 328 * because their permissions are meaningless. Check stdin_ok 329 * first because we may not have stat'ed the file. 330 */ 331 if (!stdin_ok || S_ISLNK(sp->st_mode) || !access(name, W_OK)) 332 return (1); 333 strmode(sp->st_mode, modep); 334 (void)fprintf(stderr, "override %s%s%s/%s for %s? ", 335 modep + 1, modep[9] == ' ' ? "" : " ", 336 user_from_uid(sp->st_uid, 0), 337 group_from_gid(sp->st_gid, 0), path); 338 } 339 (void)fflush(stderr); 340 341 first = ch = getchar(); 342 while (ch != '\n' && ch != EOF) 343 ch = getchar(); 344 return (first == 'y'); 345 } 346 347 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || (a)[1] == '.' && !(a)[2])) 348 void 349 checkdot(argv) 350 char **argv; 351 { 352 char *p, **save, **t; 353 int complained; 354 355 complained = 0; 356 for (t = argv; *t;) { 357 if ((p = strrchr(*t, '/')) != NULL) 358 ++p; 359 else 360 p = *t; 361 if (ISDOT(p)) { 362 if (!complained++) 363 warnx("\".\" and \"..\" may not be removed"); 364 eval = 1; 365 for (save = t; (t[0] = t[1]) != NULL; ++t); 366 t = save; 367 } else 368 ++t; 369 } 370 } 371 372 void 373 usage() 374 { 375 376 (void)fprintf(stderr, "usage: rm [-dfiRr] file ...\n"); 377 exit(1); 378 } 379
Indexes created Sun Oct 12 02:09:55 GMT 2025