summaryrefslogtreecommitdiffstats
path: root/bin/rm/rm.c
diff options
context:
space:
mode:
Diffstat (limited to 'bin/rm/rm.c')
-rw-r--r--bin/rm/rm.c644
1 files changed, 644 insertions, 0 deletions
diff --git a/bin/rm/rm.c b/bin/rm/rm.c
new file mode 100644
index 0000000..7beae2d
--- /dev/null
+++ b/bin/rm/rm.c
@@ -0,0 +1,644 @@
+/*-
+ * 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.
+ * 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.
+ */
+
+#if 0
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1990, 1993, 1994\n\
+ The Regents of the University of California. All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
+#endif /* not lint */
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <sys/mount.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fts.h>
+#include <grp.h>
+#include <locale.h>
+#include <pwd.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+static int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
+static int rflag, Iflag, xflag;
+static uid_t uid;
+static volatile sig_atomic_t info;
+
+static int check(const char *, const char *, struct stat *);
+static int check2(char **);
+static void checkdot(char **);
+static void checkslash(char **);
+static void rm_file(char **);
+static int rm_overwrite(const char *, struct stat *);
+static void rm_tree(char **);
+static void siginfo(int __unused);
+static 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;
+ char *p;
+
+ (void)setlocale(LC_ALL, "");
+
+ /*
+ * Test for the special case where the utility is called as
+ * "unlink", for which the functionality provided is greatly
+ * simplified.
+ */
+ if ((p = strrchr(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 = xflag = 0;
+ while ((ch = getopt(argc, argv, "dfiIPRrvWx")) != -1)
+ switch(ch) {
+ case 'd':
+ dflag = 1;
+ break;
+ case 'f':
+ fflag = 1;
+ iflag = 0;
+ break;
+ case 'i':
+ fflag = 0;
+ iflag = 1;
+ break;
+ case 'I':
+ 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;
+ case 'x':
+ xflag = 1;
+ break;
+ default:
+ usage();
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (argc < 1) {
+ if (fflag)
+ return (0);
+ usage();
+ }
+
+ checkdot(argv);
+ checkslash(argv);
+ uid = geteuid();
+
+ (void)signal(SIGINFO, siginfo);
+ if (*argv) {
+ stdin_ok = isatty(STDIN_FILENO);
+
+ if (Iflag) {
+ if (check2(argv) == 0)
+ exit (1);
+ }
+ if (rflag)
+ rm_tree(argv);
+ else
+ rm_file(argv);
+ }
+
+ exit (eval);
+}
+
+static 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 (xflag)
+ flags |= FTS_XDEV;
+ if (!(fts = fts_open(argv, flags, NULL))) {
+ if (fflag && errno == ENOENT)
+ return;
+ err(1, "fts_open");
+ }
+ 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:
+ /*
+ * Assume that since fts_read() couldn'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)) &&
+ lchflags(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 = lchflags(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);
+ if (rval == 0 && info) {
+ info = 0;
+ (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);
+ if (info) {
+ info = 0;
+ (void)printf("%s\n",
+ p->fts_path);
+ }
+ continue;
+ }
+ break;
+
+ case FTS_NS:
+ /*
+ * Assume that since fts_read() couldn't stat
+ * the file, it can't be unlinked.
+ */
+ if (fflag)
+ continue;
+ /* FALLTHROUGH */
+
+ case FTS_F:
+ case FTS_NSOK:
+ if (Pflag)
+ if (!rm_overwrite(p->fts_accpath, p->fts_info ==
+ FTS_NSOK ? NULL : p->fts_statp))
+ continue;
+ /* FALLTHROUGH */
+
+ default:
+ rval = unlink(p->fts_accpath);
+ if (rval == 0 || (fflag && errno == ENOENT)) {
+ if (rval == 0 && vflag)
+ (void)printf("%s\n",
+ p->fts_path);
+ if (rval == 0 && info) {
+ info = 0;
+ (void)printf("%s\n",
+ p->fts_path);
+ }
+ continue;
+ }
+ }
+ }
+err:
+ warn("%s", p->fts_path);
+ eval = 1;
+ }
+ if (!fflag && errno)
+ err(1, "fts_read");
+ fts_close(fts);
+}
+
+static 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 && !S_ISWHT(sb.st_mode) &&
+ (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
+ !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
+ rval = lchflags(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)
+ if (!rm_overwrite(f, &sb))
+ continue;
+ rval = unlink(f);
+ }
+ }
+ if (rval && (!fflag || errno != ENOENT)) {
+ warn("%s", f);
+ eval = 1;
+ }
+ if (vflag && rval == 0)
+ (void)printf("%s\n", f);
+ if (info && rval == 0) {
+ info = 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 file system (like FFS, or a V7 or a
+ * System V file system). In a logging or COW file system, you'll have to
+ * have kernel support.
+ */
+static int
+rm_overwrite(const char *file, struct stat *sbp)
+{
+ struct stat sb, sb2;
+ 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 (1);
+ if (sbp->st_nlink > 1 && !fflag) {
+ warnx("%s (inode %ju): not overwritten due to multiple links",
+ file, (uintmax_t)sbp->st_ino);
+ return (0);
+ }
+ if ((fd = open(file, O_WRONLY|O_NONBLOCK|O_NOFOLLOW, 0)) == -1)
+ goto err;
+ if (fstat(fd, &sb2))
+ goto err;
+ if (sb2.st_dev != sbp->st_dev || sb2.st_ino != sbp->st_ino ||
+ !S_ISREG(sb2.st_mode)) {
+ errno = EPERM;
+ goto err;
+ }
+ if (fstatfs(fd, &fsb) == -1)
+ goto err;
+ bsize = MAX(fsb.f_iosize, 1024);
+ if ((buf = malloc(bsize)) == NULL)
+ err(1, "%s: malloc", file);
+
+#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 (1);
+ }
+
+err: eval = 1;
+ if (buf)
+ free(buf);
+ if (fd != -1)
+ close(fd);
+ warn("%s", file);
+ return (0);
+}
+
+
+static int
+check(const char *path, const 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, "fflagstostr");
+ if (Pflag)
+ errx(1,
+ "%s: -P was specified, but file is not writable",
+ path);
+ (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 ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0')
+static void
+checkslash(char **argv)
+{
+ char **t, **u;
+ int complained;
+
+ complained = 0;
+ for (t = argv; *t;) {
+ if (ISSLASH(*t)) {
+ if (!complained++)
+ warnx("\"/\" may not be removed");
+ eval = 1;
+ for (u = t; u[0] != NULL; ++u)
+ u[0] = u[1];
+ } else {
+ ++t;
+ }
+ }
+}
+
+static int
+check2(char **argv)
+{
+ struct stat st;
+ int first;
+ int ch;
+ int fcount = 0;
+ int dcount = 0;
+ int i;
+ const char *dname = NULL;
+
+ for (i = 0; argv[i]; ++i) {
+ if (lstat(argv[i], &st) == 0) {
+ if (S_ISDIR(st.st_mode)) {
+ ++dcount;
+ dname = argv[i]; /* only used if 1 dir */
+ } else {
+ ++fcount;
+ }
+ }
+ }
+ first = 0;
+ while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
+ if (dcount && rflag) {
+ fprintf(stderr, "recursively remove");
+ if (dcount == 1)
+ fprintf(stderr, " %s", dname);
+ else
+ fprintf(stderr, " %d dirs", dcount);
+ if (fcount == 1)
+ fprintf(stderr, " and 1 file");
+ else if (fcount > 1)
+ fprintf(stderr, " and %d files", fcount);
+ } else if (dcount + fcount > 3) {
+ fprintf(stderr, "remove %d files", dcount + fcount);
+ } else {
+ return(1);
+ }
+ fprintf(stderr, "? ");
+ fflush(stderr);
+
+ first = ch = getchar();
+ while (ch != '\n' && ch != EOF)
+ ch = getchar();
+ if (ch == EOF)
+ break;
+ }
+ return (first == 'y' || first == 'Y');
+}
+
+#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
+static 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;
+ }
+}
+
+static void
+usage(void)
+{
+
+ (void)fprintf(stderr, "%s\n%s\n",
+ "usage: rm [-f | -i] [-dIPRrvWx] file ...",
+ " unlink file");
+ exit(EX_USAGE);
+}
+
+static void
+siginfo(int sig __unused)
+{
+
+ info = 1;
+}
OpenPOWER on IntegriCloud