rm.c revision 191670
1306196Sjkim/*- 2160819Ssimon * Copyright (c) 1990, 1993, 1994 3160819Ssimon * The Regents of the University of California. All rights reserved. 4160819Ssimon * 5160819Ssimon * Redistribution and use in source and binary forms, with or without 6160819Ssimon * modification, are permitted provided that the following conditions 7160819Ssimon * are met: 8160819Ssimon * 1. Redistributions of source code must retain the above copyright 9160819Ssimon * notice, this list of conditions and the following disclaimer. 10160819Ssimon * 2. Redistributions in binary form must reproduce the above copyright 11160819Ssimon * notice, this list of conditions and the following disclaimer in the 12160819Ssimon * documentation and/or other materials provided with the distribution. 13160819Ssimon * 4. Neither the name of the University nor the names of its contributors 14160819Ssimon * may be used to endorse or promote products derived from this software 15160819Ssimon * without specific prior written permission. 16160819Ssimon * 17160819Ssimon * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18160819Ssimon * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19160819Ssimon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20215698Ssimon * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21215698Ssimon * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22215698Ssimon * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23215698Ssimon * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24215698Ssimon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25160819Ssimon * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26160819Ssimon * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27160819Ssimon * SUCH DAMAGE. 28160819Ssimon */ 29160819Ssimon 30160819Ssimon#if 0 31160819Ssimon#ifndef lint 32160819Ssimonstatic const char copyright[] = 33160819Ssimon"@(#) Copyright (c) 1990, 1993, 1994\n\ 34160819Ssimon The Regents of the University of California. All rights reserved.\n"; 35160819Ssimon#endif /* not lint */ 36160819Ssimon 37160819Ssimon#ifndef lint 38160819Ssimonstatic char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94"; 39160819Ssimon#endif /* not lint */ 40160819Ssimon#endif 41276864Sjkim#include <sys/cdefs.h> 42276864Sjkim__FBSDID("$FreeBSD: head/bin/rm/rm.c 191670 2009-04-29 18:08:18Z imp $"); 43160819Ssimon 44160819Ssimon#include <sys/stat.h> 45215698Ssimon#include <sys/param.h> 46215698Ssimon#include <sys/mount.h> 47215698Ssimon 48215698Ssimon#include <err.h> 49160819Ssimon#include <errno.h> 50215698Ssimon#include <fcntl.h> 51160819Ssimon#include <fts.h> 52160819Ssimon#include <grp.h> 53276864Sjkim#include <pwd.h> 54276864Sjkim#include <stdio.h> 55276864Sjkim#include <stdlib.h> 56160819Ssimon#include <string.h> 57276864Sjkim#include <sysexits.h> 58276864Sjkim#include <unistd.h> 59276864Sjkim 60276864Sjkimint dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok; 61276864Sjkimint rflag, Iflag; 62276864Sjkimuid_t uid; 63215698Ssimonvolatile sig_atomic_t info; 64276864Sjkim 65276864Sjkimint check(char *, char *, struct stat *); 66276864Sjkimint check2(char **); 67276864Sjkimvoid checkdot(char **); 68276864Sjkimvoid checkslash(char **); 69215698Ssimonvoid rm_file(char **); 70276864Sjkimint rm_overwrite(char *, struct stat *); 71160819Ssimonvoid rm_tree(char **); 72160819Ssimonstatic void siginfo(int __unused); 73160819Ssimonvoid usage(void); 74160819Ssimon 75160819Ssimon/* 76160819Ssimon * rm -- 77160819Ssimon * This rm is different from historic rm's, but is expected to match 78160819Ssimon * POSIX 1003.2 behavior. The most visible difference is that -f 79160819Ssimon * has two specific effects now, ignore non-existent files and force 80160819Ssimon * file removal. 81160819Ssimon */ 82160819Ssimonint 83160819Ssimonmain(int argc, char *argv[]) 84160819Ssimon{ 85160819Ssimon int ch; 86160819Ssimon char *p; 87160819Ssimon 88160819Ssimon /* 89160819Ssimon * Test for the special case where the utility is called as 90160819Ssimon * "unlink", for which the functionality provided is greatly 91160819Ssimon * simplified. 92160819Ssimon */ 93160819Ssimon if ((p = rindex(argv[0], '/')) == NULL) 94160819Ssimon p = argv[0]; 95160819Ssimon else 96160819Ssimon ++p; 97160819Ssimon if (strcmp(p, "unlink") == 0) { 98160819Ssimon while (getopt(argc, argv, "") != -1) 99160819Ssimon usage(); 100160819Ssimon argc -= optind; 101160819Ssimon argv += optind; 102160819Ssimon if (argc != 1) 103160819Ssimon usage(); 104160819Ssimon rm_file(&argv[0]); 105160819Ssimon exit(eval); 106160819Ssimon } 107160819Ssimon 108160819Ssimon Pflag = rflag = 0; 109160819Ssimon while ((ch = getopt(argc, argv, "dfiIPRrvW")) != -1) 110160819Ssimon switch(ch) { 111160819Ssimon case 'd': 112160819Ssimon dflag = 1; 113160819Ssimon break; 114160819Ssimon case 'f': 115160819Ssimon fflag = 1; 116160819Ssimon iflag = 0; 117160819Ssimon break; 118160819Ssimon case 'i': 119160819Ssimon fflag = 0; 120160819Ssimon iflag = 1; 121160819Ssimon break; 122160819Ssimon case 'I': 123160819Ssimon Iflag = 1; 124160819Ssimon break; 125160819Ssimon case 'P': 126160819Ssimon Pflag = 1; 127160819Ssimon break; 128160819Ssimon case 'R': 129160819Ssimon case 'r': /* Compatibility. */ 130160819Ssimon rflag = 1; 131160819Ssimon break; 132160819Ssimon case 'v': 133160819Ssimon vflag = 1; 134160819Ssimon break; 135160819Ssimon case 'W': 136306196Sjkim Wflag = 1; 137215698Ssimon break; 138215698Ssimon default: 139215698Ssimon usage(); 140215698Ssimon } 141160819Ssimon argc -= optind; 142160819Ssimon argv += optind; 143160819Ssimon 144160819Ssimon if (argc < 1) { 145160819Ssimon if (fflag) 146160819Ssimon return (0); 147160819Ssimon usage(); 148160819Ssimon } 149160819Ssimon 150160819Ssimon checkdot(argv); 151160819Ssimon if (getenv("POSIXLY_CORRECT") == NULL) 152160819Ssimon checkslash(argv); 153160819Ssimon uid = geteuid(); 154160819Ssimon 155269686Sjkim (void)signal(SIGINFO, siginfo); 156160819Ssimon if (*argv) { 157160819Ssimon stdin_ok = isatty(STDIN_FILENO); 158160819Ssimon 159160819Ssimon if (Iflag) { 160160819Ssimon if (check2(argv) == 0) 161160819Ssimon exit (1); 162160819Ssimon } 163160819Ssimon if (rflag) 164160819Ssimon rm_tree(argv); 165160819Ssimon else 166160819Ssimon rm_file(argv); 167160819Ssimon } 168160819Ssimon 169276864Sjkim exit (eval); 170276864Sjkim} 171160819Ssimon 172160819Ssimonvoid 173160819Ssimonrm_tree(char **argv) 174160819Ssimon{ 175160819Ssimon FTS *fts; 176160819Ssimon FTSENT *p; 177160819Ssimon int needstat; 178160819Ssimon int flags; 179160819Ssimon int rval; 180160819Ssimon 181160819Ssimon /* 182160819Ssimon * Remove a file hierarchy. If forcing removal (-f), or interactive 183160819Ssimon * (-i) or can't ask anyway (stdin_ok), don't stat the file. 184160819Ssimon */ 185160819Ssimon needstat = !uid || (!fflag && !iflag && stdin_ok); 186160819Ssimon 187160819Ssimon /* 188160819Ssimon * If the -i option is specified, the user can skip on the pre-order 189160819Ssimon * visit. The fts_number field flags skipped directories. 190160819Ssimon */ 191160819Ssimon#define SKIPPED 1 192160819Ssimon 193160819Ssimon flags = FTS_PHYSICAL; 194160819Ssimon if (!needstat) 195160819Ssimon flags |= FTS_NOSTAT; 196160819Ssimon if (Wflag) 197160819Ssimon flags |= FTS_WHITEOUT; 198160819Ssimon if (!(fts = fts_open(argv, flags, NULL))) { 199160819Ssimon if (fflag && errno == ENOENT) 200160819Ssimon return; 201160819Ssimon err(1, "fts_open"); 202160819Ssimon } 203160819Ssimon while ((p = fts_read(fts)) != NULL) { 204160819Ssimon switch (p->fts_info) { 205160819Ssimon case FTS_DNR: 206160819Ssimon if (!fflag || p->fts_errno != ENOENT) { 207160819Ssimon warnx("%s: %s", 208160819Ssimon p->fts_path, strerror(p->fts_errno)); 209160819Ssimon eval = 1; 210160819Ssimon } 211160819Ssimon continue; 212160819Ssimon case FTS_ERR: 213160819Ssimon errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 214160819Ssimon case FTS_NS: 215160819Ssimon /* 216160819Ssimon * Assume that since fts_read() couldn't stat the 217160819Ssimon * file, it can't be unlinked. 218160819Ssimon */ 219160819Ssimon if (!needstat) 220276864Sjkim break; 221276864Sjkim if (!fflag || p->fts_errno != ENOENT) { 222160819Ssimon warnx("%s: %s", 223276864Sjkim p->fts_path, strerror(p->fts_errno)); 224160819Ssimon eval = 1; 225160819Ssimon } 226160819Ssimon continue; 227160819Ssimon case FTS_D: 228276864Sjkim /* Pre-order: give user chance to skip. */ 229160819Ssimon if (!fflag && !check(p->fts_path, p->fts_accpath, 230160819Ssimon p->fts_statp)) { 231160819Ssimon (void)fts_set(fts, p, FTS_SKIP); 232160819Ssimon p->fts_number = SKIPPED; 233160819Ssimon } 234160819Ssimon else if (!uid && 235160819Ssimon (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 236160819Ssimon !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 237215698Ssimon chflags(p->fts_accpath, 238160819Ssimon p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0) 239160819Ssimon goto err; 240160819Ssimon continue; 241238405Sjkim case FTS_DP: 242160819Ssimon /* Post-order: see if user skipped. */ 243160819Ssimon if (p->fts_number == SKIPPED) 244160819Ssimon continue; 245160819Ssimon break; 246160819Ssimon default: 247160819Ssimon if (!fflag && 248160819Ssimon !check(p->fts_path, p->fts_accpath, p->fts_statp)) 249160819Ssimon continue; 250215698Ssimon } 251215698Ssimon 252160819Ssimon rval = 0; 253160819Ssimon if (!uid && 254160819Ssimon (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 255215698Ssimon !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE))) 256160819Ssimon rval = chflags(p->fts_accpath, 257160819Ssimon p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); 258160819Ssimon if (rval == 0) { 259160819Ssimon /* 260160819Ssimon * If we can't read or search the directory, may still be 261215698Ssimon * able to remove it. Don't print out the un{read,search}able 262160819Ssimon * message unless the remove fails. 263160819Ssimon */ 264160819Ssimon switch (p->fts_info) { 265160819Ssimon case FTS_DP: 266160819Ssimon case FTS_DNR: 267215698Ssimon rval = rmdir(p->fts_accpath); 268160819Ssimon if (rval == 0 || (fflag && errno == ENOENT)) { 269160819Ssimon if (rval == 0 && vflag) 270160819Ssimon (void)printf("%s\n", 271160819Ssimon p->fts_path); 272160819Ssimon if (rval == 0 && info) { 273215698Ssimon info = 0; 274160819Ssimon (void)printf("%s\n", 275160819Ssimon p->fts_path); 276160819Ssimon } 277160819Ssimon continue; 278160819Ssimon } 279215698Ssimon break; 280160819Ssimon 281160819Ssimon case FTS_W: 282160819Ssimon rval = undelete(p->fts_accpath); 283160819Ssimon if (rval == 0 && (fflag && errno == ENOENT)) { 284160819Ssimon if (vflag) 285215698Ssimon (void)printf("%s\n", 286160819Ssimon p->fts_path); 287160819Ssimon if (info) { 288160819Ssimon info = 0; 289160819Ssimon (void)printf("%s\n", 290160819Ssimon p->fts_path); 291215698Ssimon } 292160819Ssimon continue; 293160819Ssimon } 294160819Ssimon break; 295160819Ssimon 296160819Ssimon case FTS_NS: 297160819Ssimon /* 298160819Ssimon * Assume that since fts_read() couldn't stat 299160819Ssimon * the file, it can't be unlinked. 300160819Ssimon */ 301160819Ssimon if (fflag) 302 continue; 303 /* FALLTHROUGH */ 304 default: 305 if (Pflag) 306 if (!rm_overwrite(p->fts_accpath, NULL)) 307 continue; 308 rval = unlink(p->fts_accpath); 309 if (rval == 0 || (fflag && errno == ENOENT)) { 310 if (rval == 0 && vflag) 311 (void)printf("%s\n", 312 p->fts_path); 313 if (rval == 0 && info) { 314 info = 0; 315 (void)printf("%s\n", 316 p->fts_path); 317 } 318 continue; 319 } 320 } 321 } 322err: 323 warn("%s", p->fts_path); 324 eval = 1; 325 } 326 if (errno) 327 err(1, "fts_read"); 328 fts_close(fts); 329} 330 331void 332rm_file(char **argv) 333{ 334 struct stat sb; 335 int rval; 336 char *f; 337 338 /* 339 * Remove a file. POSIX 1003.2 states that, by default, attempting 340 * to remove a directory is an error, so must always stat the file. 341 */ 342 while ((f = *argv++) != NULL) { 343 /* Assume if can't stat the file, can't unlink it. */ 344 if (lstat(f, &sb)) { 345 if (Wflag) { 346 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 347 } else { 348 if (!fflag || errno != ENOENT) { 349 warn("%s", f); 350 eval = 1; 351 } 352 continue; 353 } 354 } else if (Wflag) { 355 warnx("%s: %s", f, strerror(EEXIST)); 356 eval = 1; 357 continue; 358 } 359 360 if (S_ISDIR(sb.st_mode) && !dflag) { 361 warnx("%s: is a directory", f); 362 eval = 1; 363 continue; 364 } 365 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 366 continue; 367 rval = 0; 368 if (!uid && !S_ISWHT(sb.st_mode) && 369 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) && 370 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE))) 371 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE)); 372 if (rval == 0) { 373 if (S_ISWHT(sb.st_mode)) 374 rval = undelete(f); 375 else if (S_ISDIR(sb.st_mode)) 376 rval = rmdir(f); 377 else { 378 if (Pflag) 379 if (!rm_overwrite(f, &sb)) 380 continue; 381 rval = unlink(f); 382 } 383 } 384 if (rval && (!fflag || errno != ENOENT)) { 385 warn("%s", f); 386 eval = 1; 387 } 388 if (vflag && rval == 0) 389 (void)printf("%s\n", f); 390 if (info && rval == 0) { 391 info = 0; 392 (void)printf("%s\n", f); 393 } 394 } 395} 396 397/* 398 * rm_overwrite -- 399 * Overwrite the file 3 times with varying bit patterns. 400 * 401 * XXX 402 * This is a cheap way to *really* delete files. Note that only regular 403 * files are deleted, directories (and therefore names) will remain. 404 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a 405 * System V file system). In a logging file system, you'll have to have 406 * kernel support. 407 */ 408int 409rm_overwrite(char *file, struct stat *sbp) 410{ 411 struct stat sb; 412 struct statfs fsb; 413 off_t len; 414 int bsize, fd, wlen; 415 char *buf = NULL; 416 417 fd = -1; 418 if (sbp == NULL) { 419 if (lstat(file, &sb)) 420 goto err; 421 sbp = &sb; 422 } 423 if (!S_ISREG(sbp->st_mode)) 424 return (1); 425 if (sbp->st_nlink > 1 && !fflag) { 426 warnx("%s (inode %u): not overwritten due to multiple links", 427 file, sbp->st_ino); 428 return (0); 429 } 430 if ((fd = open(file, O_WRONLY, 0)) == -1) 431 goto err; 432 if (fstatfs(fd, &fsb) == -1) 433 goto err; 434 bsize = MAX(fsb.f_iosize, 1024); 435 if ((buf = malloc(bsize)) == NULL) 436 err(1, "%s: malloc", file); 437 438#define PASS(byte) { \ 439 memset(buf, byte, bsize); \ 440 for (len = sbp->st_size; len > 0; len -= wlen) { \ 441 wlen = len < bsize ? len : bsize; \ 442 if (write(fd, buf, wlen) != wlen) \ 443 goto err; \ 444 } \ 445} 446 PASS(0xff); 447 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 448 goto err; 449 PASS(0x00); 450 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) 451 goto err; 452 PASS(0xff); 453 if (!fsync(fd) && !close(fd)) { 454 free(buf); 455 return (1); 456 } 457 458err: eval = 1; 459 if (buf) 460 free(buf); 461 if (fd != -1) 462 close(fd); 463 warn("%s", file); 464 return (0); 465} 466 467 468int 469check(char *path, char *name, struct stat *sp) 470{ 471 int ch, first; 472 char modep[15], *flagsp; 473 474 /* Check -i first. */ 475 if (iflag) 476 (void)fprintf(stderr, "remove %s? ", path); 477 else { 478 /* 479 * If it's not a symbolic link and it's unwritable and we're 480 * talking to a terminal, ask. Symbolic links are excluded 481 * because their permissions are meaningless. Check stdin_ok 482 * first because we may not have stat'ed the file. 483 */ 484 if (!stdin_ok || S_ISLNK(sp->st_mode) || 485 (!access(name, W_OK) && 486 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 487 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))) 488 return (1); 489 strmode(sp->st_mode, modep); 490 if ((flagsp = fflagstostr(sp->st_flags)) == NULL) 491 err(1, "fflagstostr"); 492 if (Pflag) 493 errx(1, 494 "%s: -P was specified, but file is not writable", 495 path); 496 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ", 497 modep + 1, modep[9] == ' ' ? "" : " ", 498 user_from_uid(sp->st_uid, 0), 499 group_from_gid(sp->st_gid, 0), 500 *flagsp ? flagsp : "", *flagsp ? " " : "", 501 path); 502 free(flagsp); 503 } 504 (void)fflush(stderr); 505 506 first = ch = getchar(); 507 while (ch != '\n' && ch != EOF) 508 ch = getchar(); 509 return (first == 'y' || first == 'Y'); 510} 511 512#define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0') 513void 514checkslash(char **argv) 515{ 516 char **t, **u; 517 int complained; 518 519 complained = 0; 520 for (t = argv; *t;) { 521 if (ISSLASH(*t)) { 522 if (!complained++) 523 warnx("\"/\" may not be removed"); 524 eval = 1; 525 for (u = t; u[0] != NULL; ++u) 526 u[0] = u[1]; 527 } else { 528 ++t; 529 } 530 } 531} 532 533int 534check2(char **argv) 535{ 536 struct stat st; 537 int first; 538 int ch; 539 int fcount = 0; 540 int dcount = 0; 541 int i; 542 const char *dname = NULL; 543 544 for (i = 0; argv[i]; ++i) { 545 if (lstat(argv[i], &st) == 0) { 546 if (S_ISDIR(st.st_mode)) { 547 ++dcount; 548 dname = argv[i]; /* only used if 1 dir */ 549 } else { 550 ++fcount; 551 } 552 } 553 } 554 first = 0; 555 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') { 556 if (dcount && rflag) { 557 fprintf(stderr, "recursively remove"); 558 if (dcount == 1) 559 fprintf(stderr, " %s", dname); 560 else 561 fprintf(stderr, " %d dirs", dcount); 562 if (fcount == 1) 563 fprintf(stderr, " and 1 file"); 564 else if (fcount > 1) 565 fprintf(stderr, " and %d files", fcount); 566 } else if (dcount + fcount > 3) { 567 fprintf(stderr, "remove %d files", dcount + fcount); 568 } else { 569 return(1); 570 } 571 fprintf(stderr, "? "); 572 fflush(stderr); 573 574 first = ch = getchar(); 575 while (ch != '\n' && ch != EOF) 576 ch = getchar(); 577 if (ch == EOF) 578 break; 579 } 580 return (first == 'y' || first == 'Y'); 581} 582 583#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 584void 585checkdot(char **argv) 586{ 587 char *p, **save, **t; 588 int complained; 589 590 complained = 0; 591 for (t = argv; *t;) { 592 if ((p = strrchr(*t, '/')) != NULL) 593 ++p; 594 else 595 p = *t; 596 if (ISDOT(p)) { 597 if (!complained++) 598 warnx("\".\" and \"..\" may not be removed"); 599 eval = 1; 600 for (save = t; (t[0] = t[1]) != NULL; ++t) 601 continue; 602 t = save; 603 } else 604 ++t; 605 } 606} 607 608void 609usage(void) 610{ 611 612 (void)fprintf(stderr, "%s\n%s\n", 613 "usage: rm [-f | -i] [-dIPRrvW] file ...", 614 " unlink file"); 615 exit(EX_USAGE); 616} 617 618static void 619siginfo(int sig __unused) 620{ 621 622 info = 1; 623} 624