/*- * Copyright (c) 1990, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#) Copyright (c) 1990, 1993, 1994 The Regents of the University of California. All rights reserved. * @(#)rm.c 8.5 (Berkeley) 4/18/94 * $FreeBSD: src/bin/rm/rm.c,v 1.29.2.5 2002/07/12 07:25:48 tjr Exp $ * $DragonFly: src/bin/rm/rm.c,v 1.2 2003/06/17 04:22:50 dillon Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok; uid_t uid; int check(char *, char *, struct stat *); void checkdot(char **); void rm_file(char **); void rm_overwrite(char *, struct stat *); void rm_tree(char **); void usage(void); /* * rm -- * This rm is different from historic rm's, but is expected to match * POSIX 1003.2 behavior. The most visible difference is that -f * has two specific effects now, ignore non-existent files and force * file removal. */ int main(int argc, char *argv[]) { int ch, rflag; char *p; /* * Test for the special case where the utility is called as * "unlink", for which the functionality provided is greatly * simplified. */ if ((p = rindex(argv[0], '/')) == NULL) p = argv[0]; else ++p; if (strcmp(p, "unlink") == 0) { while (getopt(argc, argv, "") != -1) usage(); argc -= optind; argv += optind; if (argc != 1) usage(); rm_file(&argv[0]); exit(eval); } Pflag = rflag = 0; while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1) switch(ch) { case 'd': dflag = 1; break; case 'f': fflag = 1; iflag = 0; break; case 'i': fflag = 0; iflag = 1; break; case 'P': Pflag = 1; break; case 'R': case 'r': /* Compatibility. */ rflag = 1; break; case 'v': vflag = 1; break; case 'W': Wflag = 1; break; default: usage(); } argc -= optind; argv += optind; if (argc < 1) { if (fflag) return 0; usage(); } checkdot(argv); uid = geteuid(); if (*argv) { stdin_ok = isatty(STDIN_FILENO); if (rflag) rm_tree(argv); else rm_file(argv); } exit (eval); } void rm_tree(char **argv) { FTS *fts; FTSENT *p; int needstat; int flags; int rval; /* * Remove a file hierarchy. If forcing removal (-f), or interactive * (-i) or can't ask anyway (stdin_ok), don't stat the file. */ needstat = !uid || (!fflag && !iflag && stdin_ok); /* * If the -i option is specified, the user can skip on the pre-order * visit. The fts_number field flags skipped directories. */ #define SKIPPED 1 flags = FTS_PHYSICAL; if (!needstat) flags |= FTS_NOSTAT; if (Wflag) flags |= FTS_WHITEOUT; if (!(fts = fts_open(argv, flags, NULL))) err(1, NULL); while ((p = fts_read(fts)) != NULL) { switch (p->fts_info) { case FTS_DNR: if (!fflag || p->fts_errno != ENOENT) { warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); eval = 1; } continue; case FTS_ERR: errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); case FTS_NS: /* * FTS_NS: assume that if can't stat the file, it * can't be unlinked. */ if (!needstat) break; if (!fflag || p->fts_errno != ENOENT) { warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); eval = 1; } continue; case FTS_D: /* Pre-order: give user chance to skip. */ if (!fflag && !check(p->fts_path, p->fts_accpath, p->fts_statp)) { (void)fts_set(fts, p, FTS_SKIP); p->fts_number = SKIPPED; } else if (!uid && (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && chflags(p->fts_accpath, p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0) goto err; continue; case FTS_DP: /* Post-order: see if user skipped. */ if (p->fts_number == SKIPPED) continue; break; default: if (!fflag && !check(p->fts_path, p->fts_accpath, p->fts_statp)) continue; } rval = 0; if (!uid && (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE))) rval = chflags(p->fts_accpath, p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); if (rval == 0) { /* * If we can't read or search the directory, may still be * able to remove it. Don't print out the un{read,search}able * message unless the remove fails. */ switch (p->fts_info) { case FTS_DP: case FTS_DNR: rval = rmdir(p->fts_accpath); if (rval == 0 || (fflag && errno == ENOENT)) { if (rval == 0 && vflag) (void)printf("%s\n", p->fts_path); continue; } break; case FTS_W: rval = undelete(p->fts_accpath); if (rval == 0 && (fflag && errno == ENOENT)) { if (vflag) (void)printf("%s\n", p->fts_path); continue; } break; default: if (Pflag) rm_overwrite(p->fts_accpath, NULL); rval = unlink(p->fts_accpath); if (rval == 0 || (fflag && errno == ENOENT)) { if (rval == 0 && vflag) (void)printf("%s\n", p->fts_path); continue; } } } err: warn("%s", p->fts_path); eval = 1; } if (errno) err(1, "fts_read"); } void rm_file(char **argv) { struct stat sb; int rval; char *f; /* * Remove a file. POSIX 1003.2 states that, by default, attempting * to remove a directory is an error, so must always stat the file. */ while ((f = *argv++) != NULL) { /* Assume if can't stat the file, can't unlink it. */ if (lstat(f, &sb)) { if (Wflag) { sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; } else { if (!fflag || errno != ENOENT) { warn("%s", f); eval = 1; } continue; } } else if (Wflag) { warnx("%s: %s", f, strerror(EEXIST)); eval = 1; continue; } if (S_ISDIR(sb.st_mode) && !dflag) { warnx("%s: is a directory", f); eval = 1; continue; } if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) continue; rval = 0; if (!uid && (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) && !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE))) rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE)); if (rval == 0) { if (S_ISWHT(sb.st_mode)) rval = undelete(f); else if (S_ISDIR(sb.st_mode)) rval = rmdir(f); else { if (Pflag) rm_overwrite(f, &sb); rval = unlink(f); } } if (rval && (!fflag || errno != ENOENT)) { warn("%s", f); eval = 1; } if (vflag && rval == 0) (void)printf("%s\n", f); } } /* * rm_overwrite -- * Overwrite the file 3 times with varying bit patterns. * * XXX * This is a cheap way to *really* delete files. Note that only regular * files are deleted, directories (and therefore names) will remain. * Also, this assumes a fixed-block filesystem (like FFS, or a V7 or a * System V filesystem). In a logging filesystem, you'll have to have * kernel support. */ void rm_overwrite(char *file, struct stat *sbp) { struct stat sb; struct statfs fsb; off_t len; int bsize, fd, wlen; char *buf = NULL; fd = -1; if (sbp == NULL) { if (lstat(file, &sb)) goto err; sbp = &sb; } if (!S_ISREG(sbp->st_mode)) return; if ((fd = open(file, O_WRONLY, 0)) == -1) goto err; if (fstatfs(fd, &fsb) == -1) goto err; bsize = MAX(fsb.f_iosize, 1024); if ((buf = malloc(bsize)) == NULL) err(1, "malloc"); #define PASS(byte) { \ memset(buf, byte, bsize); \ for (len = sbp->st_size; len > 0; len -= wlen) { \ wlen = len < bsize ? len : bsize; \ if (write(fd, buf, wlen) != wlen) \ goto err; \ } \ } PASS(0xff); if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) goto err; PASS(0x00); if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) goto err; PASS(0xff); if (!fsync(fd) && !close(fd)) { free(buf); return; } err: eval = 1; if (buf) free(buf); warn("%s", file); } int check(char *path, char *name, struct stat *sp) { int ch, first; char modep[15], *flagsp; /* Check -i first. */ if (iflag) (void)fprintf(stderr, "remove %s? ", path); else { /* * If it's not a symbolic link and it's unwritable and we're * talking to a terminal, ask. Symbolic links are excluded * because their permissions are meaningless. Check stdin_ok * first because we may not have stat'ed the file. */ if (!stdin_ok || S_ISLNK(sp->st_mode) || (!access(name, W_OK) && !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))) return (1); strmode(sp->st_mode, modep); if ((flagsp = fflagstostr(sp->st_flags)) == NULL) err(1, NULL); (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ", modep + 1, modep[9] == ' ' ? "" : " ", user_from_uid(sp->st_uid, 0), group_from_gid(sp->st_gid, 0), *flagsp ? flagsp : "", *flagsp ? " " : "", path); free(flagsp); } (void)fflush(stderr); first = ch = getchar(); while (ch != '\n' && ch != EOF) ch = getchar(); return (first == 'y' || first == 'Y'); } #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) void checkdot(char **argv) { char *p, **save, **t; int complained; complained = 0; for (t = argv; *t;) { if ((p = strrchr(*t, '/')) != NULL) ++p; else p = *t; if (ISDOT(p)) { if (!complained++) warnx("\".\" and \"..\" may not be removed"); eval = 1; for (save = t; (t[0] = t[1]) != NULL; ++t) continue; t = save; } else ++t; } } void usage(void) { (void)fprintf(stderr, "%s\n%s\n", "usage: rm [-f | -i] [-dPRrvW] file ...", " unlink file"); exit(EX_USAGE); }