direct copy of cp and rm code into mv, so it can avoid fork+exec.

some or even most of the code can still be streamlined more.
ok deraadt

1 files changed, 796 insertions, 0 deletions

diff --git a/bin/mv/cp.c b/bin/mv/cp.c
new file mode 100644
index 00000000000..79e8d593037
--- /dev/null
+++ b/bin/mv/cp.c
@@ -0,0 +1,796 @@
+/*	$OpenBSD: cp.c,v 1.1 2015/11/17 17:24:26 tedu Exp $	*/
+/*	$NetBSD: cp.c,v 1.14 1995/09/07 06:14:51 jtc Exp $	*/
+
+/*
+ * Copyright (c) 1988, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * David Hitz of Auspex Systems Inc.
+ *
+ * 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. 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.
+ */
+
+/*
+ * Cp copies source files to target files.
+ *
+ * The global PATH_T structure "to" always contains the path to the
+ * current target file.  Since fts(3) does not change directories,
+ * this path can be either absolute or dot-relative.
+ *
+ * The basic algorithm is to initialize "to" and use fts(3) to traverse
+ * the file hierarchy rooted in the argument list.  A trivial case is the
+ * case of 'cp file1 file2'.  The more interesting case is the case of
+ * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the
+ * path (relative to the root of the traversal) is appended to dir (stored
+ * in "to") to form the final target path.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+
+#include <dirent.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fts.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+
+#define	fts_dne(_x)	(_x->fts_pointer != NULL)
+
+typedef struct {
+	char *p_end;                    /* pointer to NULL at end of path */
+	char *target_end;               /* pointer to end of target base */
+	char p_path[PATH_MAX];          /* pointer to the start of a path */
+} PATH_T;
+
+static PATH_T to = { to.p_path, "" };
+
+static int     copy_fifo(struct stat *, int);
+static int     copy_file(FTSENT *, int);
+static int     copy_link(FTSENT *, int);
+static int     copy_special(struct stat *, int);
+static int     setfile(struct stat *, int);
+static int     setlink(struct stat *);
+
+
+extern char *__progname;
+
+static uid_t myuid;
+static int Rflag, fflag, iflag, pflag, rflag;
+static mode_t myumask;
+
+enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
+
+static int copy(char *[], enum op, int);
+static char *find_last_component(char *);
+
+static void __dead
+usage(void)
+{
+	(void)fprintf(stderr,
+	    "usage: %s [-fip] [-R [-H | -L | -P]] source target\n", __progname);
+	(void)fprintf(stderr,
+	    "       %s [-fip] [-R [-H | -L | -P]] source ... directory\n",
+	    __progname);
+	exit(1);
+}
+
+int
+cpmain(int argc, char *argv[])
+{
+	struct stat to_stat, tmp_stat;
+	enum op type;
+	int Hflag, Lflag, Pflag, ch, fts_options, r;
+	char *target;
+
+	(void)setlocale(LC_ALL, "");
+
+	Hflag = Lflag = Pflag = Rflag = 0;
+	while ((ch = getopt(argc, argv, "HLPRfipr")) != -1)
+		switch (ch) {
+		case 'H':
+			Hflag = 1;
+			Lflag = Pflag = 0;
+			break;
+		case 'L':
+			Lflag = 1;
+			Hflag = Pflag = 0;
+			break;
+		case 'P':
+			Pflag = 1;
+			Hflag = Lflag = 0;
+			break;
+		case 'R':
+			Rflag = 1;
+			break;
+		case 'f':
+			fflag = 1;
+			iflag = 0;
+			break;
+		case 'i':
+			iflag = isatty(STDIN_FILENO);
+			fflag = 0;
+			break;
+		case 'p':
+			pflag = 1;
+			break;
+		case 'r':
+			rflag = 1;
+			break;
+		default:
+			usage();
+			break;
+		}
+	argc -= optind;
+	argv += optind;
+
+	/*
+	 * Unfortunately, -R will use mkfifo & mknod;
+	 * -p will use fchown, fchmod, lchown, fchflags..
+	 */
+	if (Rflag == 0 && pflag == 0)
+		if (pledge("stdio rpath wpath cpath fattr", NULL) == -1)
+			err(1, "pledge");
+
+	if (argc < 2)
+		usage();
+
+	fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
+	if (rflag) {
+		if (Rflag)
+			errx(1,
+		    "the -R and -r options may not be specified together.");
+		if (Hflag || Lflag || Pflag)
+			errx(1,
+	"the -H, -L, and -P options may not be specified with the -r option.");
+		fts_options &= ~FTS_PHYSICAL;
+		fts_options |= FTS_LOGICAL;
+	}
+	if (Rflag) {
+		if (Hflag)
+			fts_options |= FTS_COMFOLLOW;
+		if (Lflag) {
+			fts_options &= ~FTS_PHYSICAL;
+			fts_options |= FTS_LOGICAL;
+		}
+	} else {
+		fts_options &= ~FTS_PHYSICAL;
+		fts_options |= FTS_LOGICAL;
+	}
+
+	myuid = getuid();
+
+	/* Copy the umask for explicit mode setting. */
+	myumask = umask(0);
+	(void)umask(myumask);
+
+	/* Save the target base in "to". */
+	target = argv[--argc];
+	if (strlcpy(to.p_path, target, sizeof to.p_path) >= sizeof(to.p_path))
+		errx(1, "%s: name too long", target);
+	to.p_end = to.p_path + strlen(to.p_path);
+	if (to.p_path == to.p_end) {
+		*to.p_end++ = '.';
+		*to.p_end = '\0';
+	}
+	to.target_end = to.p_end;
+
+	/* Set end of argument list for fts(3). */
+	argv[argc] = NULL;
+
+	/*
+	 * Cp has two distinct cases:
+	 *
+	 * cp [-R] source target
+	 * cp [-R] source1 ... sourceN directory
+	 *
+	 * In both cases, source can be either a file or a directory.
+	 *
+	 * In (1), the target becomes a copy of the source. That is, if the
+	 * source is a file, the target will be a file, and likewise for
+	 * directories.
+	 *
+	 * In (2), the real target is not directory, but "directory/source".
+	 */
+	r = stat(to.p_path, &to_stat);
+	if (r == -1 && errno != ENOENT)
+		err(1, "%s", to.p_path);
+	if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
+		/*
+		 * Case (1).  Target is not a directory.
+		 */
+		if (argc > 1)
+			usage();
+		/*
+		 * Need to detect the case:
+		 *	cp -R dir foo
+		 * Where dir is a directory and foo does not exist, where
+		 * we want pathname concatenations turned on but not for
+		 * the initial mkdir().
+		 */
+		if (r == -1) {
+			if (rflag || (Rflag && (Lflag || Hflag)))
+				stat(*argv, &tmp_stat);
+			else
+				lstat(*argv, &tmp_stat);
+
+			if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag))
+				type = DIR_TO_DNE;
+			else
+				type = FILE_TO_FILE;
+		} else
+			type = FILE_TO_FILE;
+	} else {
+		/*
+		 * Case (2).  Target is a directory.
+		 */
+		type = FILE_TO_DIR;
+	}
+
+	return (copy(argv, type, fts_options));
+}
+
+static char *
+find_last_component(char *path)
+{
+	char *p;
+
+	if ((p = strrchr(path, '/')) == NULL)
+		p = path;
+	else {
+		/* Special case foo/ */
+		if (!*(p+1)) {
+			while ((p >= path) && *p == '/')
+				p--;
+
+			while ((p >= path) && *p != '/')
+				p--;
+		}
+
+		p++;
+	}
+
+	return (p);
+}
+
+static int
+copy(char *argv[], enum op type, int fts_options)
+{
+	struct stat to_stat;
+	FTS *ftsp;
+	FTSENT *curr;
+	int base, nlen, rval;
+	char *p, *target_mid;
+	base = 0;
+
+	if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL)
+		err(1, NULL);
+	for (rval = 0; (curr = fts_read(ftsp)) != NULL;) {
+		switch (curr->fts_info) {
+		case FTS_NS:
+		case FTS_DNR:
+		case FTS_ERR:
+			warnx("%s: %s",
+			    curr->fts_path, strerror(curr->fts_errno));
+			rval = 1;
+			continue;
+		case FTS_DC:
+			warnx("%s: directory causes a cycle", curr->fts_path);
+			rval = 1;
+			continue;
+		}
+
+		/*
+		 * If we are in case (2) or (3) above, we need to append the
+		 * source name to the target name.
+		 */
+		if (type != FILE_TO_FILE) {
+			/*
+			 * Need to remember the roots of traversals to create
+			 * correct pathnames.  If there's a directory being
+			 * copied to a non-existent directory, e.g.
+			 *	cp -R a/dir noexist
+			 * the resulting path name should be noexist/foo, not
+			 * noexist/dir/foo (where foo is a file in dir), which
+			 * is the case where the target exists.
+			 *
+			 * Also, check for "..".  This is for correct path
+			 * concatenation for paths ending in "..", e.g.
+			 *	cp -R .. /tmp
+			 * Paths ending in ".." are changed to ".".  This is
+			 * tricky, but seems the easiest way to fix the problem.
+			 *
+			 * XXX
+			 * Since the first level MUST be FTS_ROOTLEVEL, base
+			 * is always initialized.
+			 */
+			if (curr->fts_level == FTS_ROOTLEVEL) {
+				if (type != DIR_TO_DNE) {
+					p = find_last_component(curr->fts_path);
+					base = p - curr->fts_path;
+					
+					if (!strcmp(&curr->fts_path[base],
+					    ".."))
+						base += 1;
+				} else
+					base = curr->fts_pathlen;
+			}
+
+			p = &curr->fts_path[base];
+			nlen = curr->fts_pathlen - base;
+			target_mid = to.target_end;
+			if (*p != '/' && target_mid[-1] != '/')
+				*target_mid++ = '/';
+			*target_mid = '\0';
+			if (target_mid - to.p_path + nlen >= PATH_MAX) {
+				warnx("%s%s: name too long (not copied)",
+				    to.p_path, p);
+				rval = 1;
+				continue;
+			}
+			(void)strncat(target_mid, p, nlen);
+			to.p_end = target_mid + nlen;
+			*to.p_end = '\0';
+		}
+
+		/* Not an error but need to remember it happened */
+		if (stat(to.p_path, &to_stat) == -1) {
+			if (curr->fts_info == FTS_DP)
+				continue;
+			/*
+			 * We use fts_pointer as a boolean to indicate that
+			 * we created this directory ourselves.  We'll use
+			 * this later on via the fts_dne macro to decide
+			 * whether or not to set the directory mode during
+			 * the post-order pass.
+			 */
+			curr->fts_pointer = (void *)1;
+		} else {
+			/*
+			 * Set directory mode/user/times on the post-order
+			 * pass.  We can't do this earlier because the mode
+			 * may not allow us write permission.  Furthermore,
+			 * if we set the times during the pre-order pass,
+			 * they will get changed later when the directory
+			 * is populated.
+			 */
+			if (curr->fts_info == FTS_DP) {
+				if (!S_ISDIR(to_stat.st_mode))
+					continue;
+				/*
+				 * If not -p and directory didn't exist, set
+				 * it to be the same as the from directory,
+				 * unmodified by the umask; arguably wrong,
+				 * but it's been that way forever.
+				 */
+				if (pflag && setfile(curr->fts_statp, -1))
+					rval = 1;
+				else if (fts_dne(curr))
+					(void)chmod(to.p_path,
+					    curr->fts_statp->st_mode);
+				continue;
+			}
+			if (to_stat.st_dev == curr->fts_statp->st_dev &&
+			    to_stat.st_ino == curr->fts_statp->st_ino) {
+				warnx("%s and %s are identical (not copied).",
+				    to.p_path, curr->fts_path);
+				rval = 1;
+				if (S_ISDIR(curr->fts_statp->st_mode))
+					(void)fts_set(ftsp, curr, FTS_SKIP);
+				continue;
+			}
+			if (!S_ISDIR(curr->fts_statp->st_mode) &&
+			    S_ISDIR(to_stat.st_mode)) {
+		warnx("cannot overwrite directory %s with non-directory %s",
+				    to.p_path, curr->fts_path);
+				rval = 1;
+				continue;
+			}
+		}
+
+		switch (curr->fts_statp->st_mode & S_IFMT) {
+		case S_IFLNK:
+			if (copy_link(curr, !fts_dne(curr)))
+				rval = 1;
+			break;
+		case S_IFDIR:
+			if (!Rflag && !rflag) {
+				warnx("%s is a directory (not copied).",
+				    curr->fts_path);
+				(void)fts_set(ftsp, curr, FTS_SKIP);
+				rval = 1;
+				break;
+			}
+			/*
+			 * If the directory doesn't exist, create the new
+			 * one with the from file mode plus owner RWX bits,
+			 * modified by the umask.  Trade-off between being
+			 * able to write the directory (if from directory is
+			 * 555) and not causing a permissions race.  If the
+			 * umask blocks owner writes, we fail..
+			 */
+			if (fts_dne(curr)) {
+				if (mkdir(to.p_path,
+				    curr->fts_statp->st_mode | S_IRWXU) < 0)
+					err(1, "%s", to.p_path);
+			} else if (!S_ISDIR(to_stat.st_mode))
+				errc(1, ENOTDIR, "%s", to.p_path);
+			break;
+		case S_IFBLK:
+		case S_IFCHR:
+			if (Rflag) {
+				if (copy_special(curr->fts_statp, !fts_dne(curr)))
+					rval = 1;
+			} else
+				if (copy_file(curr, fts_dne(curr)))
+					rval = 1;
+			break;
+		case S_IFIFO:
+			if (Rflag) {
+				if (copy_fifo(curr->fts_statp, !fts_dne(curr)))
+					rval = 1;
+			} else
+				if (copy_file(curr, fts_dne(curr)))
+					rval = 1;
+			break;
+		case S_IFSOCK:
+			warnc(EOPNOTSUPP, "%s", curr->fts_path);
+			break;
+		default:
+			if (copy_file(curr, fts_dne(curr)))
+				rval = 1;
+			break;
+		}
+	}
+	if (errno)
+		err(1, "fts_read");
+	(void)fts_close(ftsp);
+	return (rval);
+}
+
+
+/*	$OpenBSD: cp.c,v 1.1 2015/11/17 17:24:26 tedu Exp $	*/
+/*	$NetBSD: utils.c,v 1.6 1997/02/26 14:40:51 cgd Exp $	*/
+
+/*-
+ * Copyright (c) 1991, 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. 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.
+ */
+
+#include <sys/param.h>		/* MAXBSIZE */
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fts.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+
+static int
+copy_file(FTSENT *entp, int dne)
+{
+	static char *buf;
+	static char *zeroes;
+	struct stat to_stat, *fs;
+	int ch, checkch, from_fd, rcount, rval, to_fd, wcount;
+#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
+	char *p;
+#endif
+
+	if (!buf) {
+		buf = malloc(MAXBSIZE);
+		if (!buf)
+			err(1, "malloc");
+	}
+	if (!zeroes) {
+		zeroes = calloc(1, MAXBSIZE);
+		if (!zeroes)
+			err(1, "calloc");
+	}
+
+	if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
+		warn("%s", entp->fts_path);
+		return (1);
+	}
+
+	fs = entp->fts_statp;
+
+	/*
+	 * In -f (force) mode, we always unlink the destination first
+	 * if it exists.  Note that -i and -f are mutually exclusive.
+	 */
+	if (!dne && fflag)
+		(void)unlink(to.p_path);
+
+	/*
+	 * If the file exists and we're interactive, verify with the user.
+	 * If the file DNE, set the mode to be the from file, minus setuid
+	 * bits, modified by the umask; arguably wrong, but it makes copying
+	 * executables work right and it's been that way forever.  (The
+	 * other choice is 666 or'ed with the execute bits on the from file
+	 * modified by the umask.)
+	 */
+	if (!dne && !fflag) {
+		if (iflag) {
+			(void)fprintf(stderr, "overwrite %s? ", to.p_path);
+			checkch = ch = getchar();
+			while (ch != '\n' && ch != EOF)
+				ch = getchar();
+			if (checkch != 'y' && checkch != 'Y') {
+				(void)close(from_fd);
+				return (0);
+			}
+		}
+		to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
+	} else
+		to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
+		    fs->st_mode & ~(S_ISTXT | S_ISUID | S_ISGID));
+
+	if (to_fd == -1) {
+		warn("%s", to.p_path);
+		(void)close(from_fd);
+		return (1);
+	}
+
+	rval = 0;
+
+	/*
+	 * Mmap and write if less than 8M (the limit is so we don't totally
+	 * trash memory on big files.  This is really a minor hack, but it
+	 * wins some CPU back.
+	 */
+#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
+	/* XXX broken for 0-size mmap */
+	if (fs->st_size <= 8 * 1048576) {
+		if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
+		    MAP_FILE|MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
+			warn("mmap: %s", entp->fts_path);
+			rval = 1;
+		} else {
+			madvise(p, fs->st_size, MADV_SEQUENTIAL);
+			if (write(to_fd, p, fs->st_size) != fs->st_size) {
+				warn("%s", to.p_path);
+				rval = 1;
+			}
+			/* Some systems don't unmap on close(2). */
+			if (munmap(p, fs->st_size) < 0) {
+				warn("%s", entp->fts_path);
+				rval = 1;
+			}
+		}
+	} else
+#endif
+	{
+		int skipholes = 0;
+		struct stat tosb;
+		if (!fstat(to_fd, &tosb) && S_ISREG(tosb.st_mode))
+			skipholes = 1;
+		while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
+			if (skipholes && memcmp(buf, zeroes, rcount) == 0)
+				wcount = lseek(to_fd, rcount, SEEK_CUR) == -1 ? -1 : rcount;
+			else
+				wcount = write(to_fd, buf, rcount);
+			if (rcount != wcount || wcount == -1) {
+				warn("%s", to.p_path);
+				rval = 1;
+				break;
+			}
+		}
+		if (skipholes && rcount >= 0)
+			rcount = ftruncate(to_fd, lseek(to_fd, 0, SEEK_CUR));
+		if (rcount < 0) {
+			warn("%s", entp->fts_path);
+			rval = 1;
+		}
+	}
+
+	if (rval == 1) {
+		(void)close(from_fd);
+		(void)close(to_fd);
+		return (1);
+	}
+
+	if (pflag && setfile(fs, to_fd))
+		rval = 1;
+	/*
+	 * If the source was setuid or setgid, lose the bits unless the
+	 * copy is owned by the same user and group.
+	 */
+#define	RETAINBITS \
+	(S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
+	if (!pflag && dne &&
+	    fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) {
+		if (fstat(to_fd, &to_stat)) {
+			warn("%s", to.p_path);
+			rval = 1;
+		} else if (fs->st_gid == to_stat.st_gid &&
+		    fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) {
+			warn("%s", to.p_path);
+			rval = 1;
+		}
+	}
+	(void)close(from_fd);
+	if (close(to_fd)) {
+		warn("%s", to.p_path);
+		rval = 1;
+	}
+	return (rval);
+}
+
+static int
+copy_link(FTSENT *p, int exists)
+{
+	int len;
+	char linkname[PATH_MAX];
+
+	if ((len = readlink(p->fts_path, linkname, sizeof(linkname)-1)) == -1) {
+		warn("readlink: %s", p->fts_path);
+		return (1);
+	}
+	linkname[len] = '\0';
+	if (exists && unlink(to.p_path)) {
+		warn("unlink: %s", to.p_path);
+		return (1);
+	}
+	if (symlink(linkname, to.p_path)) {
+		warn("symlink: %s", linkname);
+		return (1);
+	}
+	return (pflag ? setlink(p->fts_statp) : 0);
+}
+
+static int
+copy_fifo(struct stat *from_stat, int exists)
+{
+	if (exists && unlink(to.p_path)) {
+		warn("unlink: %s", to.p_path);
+		return (1);
+	}
+	if (mkfifo(to.p_path, from_stat->st_mode)) {
+		warn("mkfifo: %s", to.p_path);
+		return (1);
+	}
+	return (pflag ? setfile(from_stat, -1) : 0);
+}
+
+static int
+copy_special(struct stat *from_stat, int exists)
+{
+	if (exists && unlink(to.p_path)) {
+		warn("unlink: %s", to.p_path);
+		return (1);
+	}
+	if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
+		warn("mknod: %s", to.p_path);
+		return (1);
+	}
+	return (pflag ? setfile(from_stat, -1) : 0);
+}
+
+
+static int
+setfile(struct stat *fs, int fd)
+{
+	struct timespec ts[2];
+	int rval;
+
+	rval = 0;
+	fs->st_mode &= S_ISTXT | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
+
+	ts[0] = fs->st_atim;
+	ts[1] = fs->st_mtim;
+	if (fd >= 0 ? futimens(fd, ts) :
+	    utimensat(AT_FDCWD, to.p_path, ts, AT_SYMLINK_NOFOLLOW)) {
+		warn("update times: %s", to.p_path);
+		rval = 1;
+	}
+	/*
+	 * Changing the ownership probably won't succeed, unless we're root
+	 * or POSIX_CHOWN_RESTRICTED is not set.  Set uid/gid before setting
+	 * the mode; current BSD behavior is to remove all setuid bits on
+	 * chown.  If chown fails, lose setuid/setgid bits.
+	 */
+	if (fd >= 0 ? fchown(fd, fs->st_uid, fs->st_gid) :
+	    lchown(to.p_path, fs->st_uid, fs->st_gid)) {
+		if (errno != EPERM) {
+			warn("chown: %s", to.p_path);
+			rval = 1;
+		}
+		fs->st_mode &= ~(S_ISTXT | S_ISUID | S_ISGID);
+	}
+	if (fd >= 0 ? fchmod(fd, fs->st_mode) :
+	    fchmodat(AT_FDCWD, to.p_path, fs->st_mode, AT_SYMLINK_NOFOLLOW)) {
+		warn("chmod: %s", to.p_path);
+		rval = 1;
+	}
+
+	/*
+	 * XXX
+	 * NFS doesn't support chflags; ignore errors unless there's reason
+	 * to believe we're losing bits.  (Note, this still won't be right
+	 * if the server supports flags and we were trying to *remove* flags
+	 * on a file that we copied, i.e., that we didn't create.)
+	 */
+	errno = 0;
+	if (fd >= 0 ? fchflags(fd, fs->st_flags) :
+	    chflagsat(AT_FDCWD, to.p_path, fs->st_flags, AT_SYMLINK_NOFOLLOW))
+		if (errno != EOPNOTSUPP || fs->st_flags != 0) {
+			warn("chflags: %s", to.p_path);
+			rval = 1;
+		}
+	return (rval);
+}
+
+
+static int
+setlink(struct stat *fs)
+{
+
+	if (lchown(to.p_path, fs->st_uid, fs->st_gid)) {
+		if (errno != EPERM) {
+			warn("lchown: %s", to.p_path);
+			return (1);
+		}
+	}
+	return (0);
+}