1/*-
2 * Copyright (c) 1988, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * David Hitz of Auspex Systems Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if 0
34#ifndef lint
35static char const copyright[] =
36"@(#) Copyright (c) 1988, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)cp.c	8.2 (Berkeley) 4/1/94";
42#endif /* not lint */
43#endif
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD: src/bin/cp/cp.c,v 1.52 2005/09/05 04:36:08 csjp Exp $");
46
47/*
48 * Cp copies source files to target files.
49 *
50 * The global PATH_T structure "to" always contains the path to the
51 * current target file.  Since fts(3) does not change directories,
52 * this path can be either absolute or dot-relative.
53 *
54 * The basic algorithm is to initialize "to" and use fts(3) to traverse
55 * the file hierarchy rooted in the argument list.  A trivial case is the
56 * case of 'cp file1 file2'.  The more interesting case is the case of
57 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the
58 * path (relative to the root of the traversal) is appended to dir (stored
59 * in "to") to form the final target path.
60 */
61
62#include <sys/types.h>
63#include <sys/stat.h>
64
65#include <err.h>
66#include <errno.h>
67#include <fts.h>
68#include <limits.h>
69#include <signal.h>
70#include <stdio.h>
71#include <stdlib.h>
72#include <string.h>
73#include <unistd.h>
74
75#ifdef __APPLE__
76#include <copyfile.h>
77#include <get_compat.h>
78#else /* !__APPLE__ */
79#define COMPAT_MODE(a,b) (1)
80#endif /* __APPLE__ */
81
82#include "extern.h"
83
84#define	STRIP_TRAILING_SLASH(p) {					\
85        while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/')	\
86                *--(p).p_end = 0;					\
87}
88
89static char emptystring[] = "";
90
91PATH_T to = { to.p_path, emptystring, "" };
92
93int fflag, iflag, nflag, pflag, vflag;
94#ifdef __APPLE__
95int Xflag;
96#endif /* __APPLE__ */
97static int Rflag, rflag;
98volatile sig_atomic_t info;
99
100enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
101
102static int copy(char *[], enum op, int);
103static void siginfo(int __unused);
104
105int
106main(int argc, char *argv[])
107{
108	struct stat to_stat, tmp_stat;
109	enum op type;
110	int Hflag, Lflag, Pflag, ch, fts_options, r, have_trailing_slash;
111	char *target;
112
113	Hflag = Lflag = Pflag = 0;
114	while ((ch = getopt(argc, argv, "HLPRXafinprv")) != -1)
115		switch (ch) {
116		case 'H':
117			Hflag = 1;
118			Lflag = Pflag = 0;
119			break;
120		case 'L':
121			Lflag = 1;
122			Hflag = Pflag = 0;
123			break;
124		case 'P':
125			Pflag = 1;
126			Hflag = Lflag = 0;
127			break;
128		case 'R':
129			Rflag = 1;
130			break;
131		case 'X':
132			Xflag = 1;
133			break;
134		case 'f':
135			fflag = 1;
136			/* Determine if the STD is SUSv3 or Legacy */
137			if (COMPAT_MODE("bin/cp", "unix2003"))
138				nflag = 0;	/* reset nflag, but not iflag */
139			else
140				iflag = nflag = 0;	/* reset both */
141			break;
142		case 'i':
143			iflag = 1;
144			if (COMPAT_MODE("bin/cp", "unix2003"))
145				nflag = 0;	/* reset nflag, but not fflag */
146			else
147				fflag = nflag = 0;
148			break;
149		case 'n':
150			nflag = 1;
151			fflag = iflag = 0;
152			break;
153		case 'p':
154			pflag = 1;
155			break;
156		case 'r':
157			rflag = 1;
158			break;
159		case 'v':
160			vflag = 1;
161			break;
162		case 'a':
163			pflag = 1;
164			Pflag = 1;
165			Rflag = 1;
166			break;
167		default:
168			usage();
169			break;
170		}
171	argc -= optind;
172	argv += optind;
173
174	if (argc < 2)
175		usage();
176
177	fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
178	if (rflag) {
179		if (Rflag)
180			errx(1,
181		    "the -R and -r options may not be specified together.");
182		if (Hflag || Lflag || Pflag)
183			errx(1,
184	"the -H, -L, and -P options may not be specified with the -r option.");
185		fts_options &= ~FTS_PHYSICAL;
186		fts_options |= FTS_LOGICAL;
187	}
188	if (Rflag) {
189		if (Hflag)
190			fts_options |= FTS_COMFOLLOW;
191		if (Lflag) {
192			fts_options &= ~FTS_PHYSICAL;
193			fts_options |= FTS_LOGICAL;
194		}
195	} else {
196		fts_options &= ~FTS_PHYSICAL;
197		fts_options |= FTS_LOGICAL | FTS_COMFOLLOW;
198	}
199	(void)signal(SIGINFO, siginfo);
200
201	/* Save the target base in "to". */
202	target = argv[--argc];
203	if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path))
204		errx(1, "%s: name too long", target);
205	to.p_end = to.p_path + strlen(to.p_path);
206        if (to.p_path == to.p_end) {
207		*to.p_end++ = '.';
208		*to.p_end = 0;
209	}
210	have_trailing_slash = (to.p_end[-1] == '/');
211	if (have_trailing_slash)
212		STRIP_TRAILING_SLASH(to);
213	to.target_end = to.p_end;
214
215	/* Set end of argument list for fts(3). */
216	argv[argc] = NULL;
217
218	/*
219	 * Cp has two distinct cases:
220	 *
221	 * cp [-R] source target
222	 * cp [-R] source1 ... sourceN directory
223	 *
224	 * In both cases, source can be either a file or a directory.
225	 *
226	 * In (1), the target becomes a copy of the source. That is, if the
227	 * source is a file, the target will be a file, and likewise for
228	 * directories.
229	 *
230	 * In (2), the real target is not directory, but "directory/source".
231	 */
232	r = stat(to.p_path, &to_stat);
233	if (r == -1 && errno != ENOENT)
234		err(1, "%s", to.p_path);
235	if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
236		/*
237		 * Case (1).  Target is not a directory.
238		 */
239		if (argc > 1) {
240			usage();
241			exit(1);
242		}
243		/*
244		 * Need to detect the case:
245		 *	cp -R dir foo
246		 * Where dir is a directory and foo does not exist, where
247		 * we want pathname concatenations turned on but not for
248		 * the initial mkdir().
249		 */
250		if (r == -1) {
251			if (rflag || (Rflag && (Lflag || Hflag)))
252				stat(*argv, &tmp_stat);
253			else
254				lstat(*argv, &tmp_stat);
255
256			if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag))
257				type = DIR_TO_DNE;
258			else
259				type = FILE_TO_FILE;
260		} else
261			type = FILE_TO_FILE;
262
263		if (have_trailing_slash && type == FILE_TO_FILE) {
264			if (r == -1)
265				errx(1, "directory %s does not exist",
266				     to.p_path);
267			else
268				errx(1, "%s is not a directory", to.p_path);
269		}
270	} else
271		/*
272		 * Case (2).  Target is a directory.
273		 */
274		type = FILE_TO_DIR;
275
276	exit (copy(argv, type, fts_options));
277}
278
279static int
280copy(char *argv[], enum op type, int fts_options)
281{
282	struct stat to_stat;
283	FTS *ftsp;
284	FTSENT *curr;
285	int base = 0, dne, badcp, rval;
286	size_t nlen;
287	char *p, *target_mid;
288	mode_t mask, mode;
289
290	/*
291	 * Keep an inverted copy of the umask, for use in correcting
292	 * permissions on created directories when not using -p.
293	 */
294	mask = ~umask(0777);
295	umask(~mask);
296
297	if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL)
298		err(1, "fts_open");
299	for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) {
300		switch (curr->fts_info) {
301		case FTS_NS:
302		case FTS_DNR:
303		case FTS_ERR:
304			warnx("%s: %s",
305			    curr->fts_path, strerror(curr->fts_errno));
306			rval = 1;
307			continue;
308		case FTS_DC:			/* Warn, continue. */
309			warnx("%s: directory causes a cycle", curr->fts_path);
310			rval = 1;
311			continue;
312		default:
313			;
314		}
315#ifdef __APPLE__
316
317#ifdef __clang__
318#pragma clang diagnostic push
319/* clang doesn't like fts_name[1], but we know better... */
320#pragma clang diagnostic ignored "-Warray-bounds"
321#endif
322		/* Skip ._<file> when using copyfile and <file> exists */
323		if ((pflag || !Xflag) && (curr->fts_level != FTS_ROOTLEVEL) &&
324		    (curr->fts_namelen > 2) && /* ._\0 is not AppleDouble */
325		    (curr->fts_name[0] == '.') && (curr->fts_name[1] == '_')) {
326#ifdef __clang__
327#pragma clang diagnostic pop
328#endif
329			struct stat statbuf;
330			char path[PATH_MAX];
331			char *p = strrchr(curr->fts_path, '/');
332			if (p) {
333				size_t s = p + 2 - curr->fts_path;
334				if (s > sizeof(path)) s = sizeof(path);
335				strlcpy(path, curr->fts_path, s);
336				strlcat(path, curr->fts_name+2, sizeof(path));
337			} else {
338				strlcpy(path, curr->fts_name+2, sizeof(path));
339			}
340			if (!lstat(path, &statbuf)) {
341				continue;
342			}
343		}
344#endif /* __APPLE__ */
345		/*
346		 * If we are in case (2) or (3) above, we need to append the
347                 * source name to the target name.
348                 */
349		if (type != FILE_TO_FILE) {
350			/*
351			 * Need to remember the roots of traversals to create
352			 * correct pathnames.  If there's a directory being
353			 * copied to a non-existent directory, e.g.
354			 *	cp -R a/dir noexist
355			 * the resulting path name should be noexist/foo, not
356			 * noexist/dir/foo (where foo is a file in dir), which
357			 * is the case where the target exists.
358			 *
359			 * Also, check for "..".  This is for correct path
360			 * concatenation for paths ending in "..", e.g.
361			 *	cp -R .. /tmp
362			 * Paths ending in ".." are changed to ".".  This is
363			 * tricky, but seems the easiest way to fix the problem.
364			 *
365			 * XXX
366			 * Since the first level MUST be FTS_ROOTLEVEL, base
367			 * is always initialized.
368			 */
369			if (curr->fts_level == FTS_ROOTLEVEL) {
370				if (type != DIR_TO_DNE) {
371					p = strrchr(curr->fts_path, '/');
372					base = (p == NULL) ? 0 :
373					    (int)(p - curr->fts_path + 1);
374
375					if (!strcmp(&curr->fts_path[base],
376					    ".."))
377						base += 1;
378				} else
379					base = curr->fts_pathlen;
380			}
381
382			p = &curr->fts_path[base];
383			nlen = curr->fts_pathlen - base;
384			target_mid = to.target_end;
385			if (*p != '/' && target_mid[-1] != '/')
386				*target_mid++ = '/';
387			*target_mid = 0;
388			if (target_mid - to.p_path + nlen >= PATH_MAX) {
389				warnx("%s%s: name too long (not copied)",
390				    to.p_path, p);
391				rval = 1;
392				continue;
393			}
394			(void)strncat(target_mid, p, nlen);
395			to.p_end = target_mid + nlen;
396			*to.p_end = 0;
397			STRIP_TRAILING_SLASH(to);
398		}
399
400		if (curr->fts_info == FTS_DP) {
401			/*
402			 * We are nearly finished with this directory.  If we
403			 * didn't actually copy it, or otherwise don't need to
404			 * change its attributes, then we are done.
405			 */
406			if (!curr->fts_number)
407				continue;
408			/*
409			 * If -p is in effect, set all the attributes.
410			 * Otherwise, set the correct permissions, limited
411			 * by the umask.  Optimise by avoiding a chmod()
412			 * if possible (which is usually the case if we
413			 * made the directory).  Note that mkdir() does not
414			 * honour setuid, setgid and sticky bits, but we
415			 * normally want to preserve them on directories.
416			 */
417			if (pflag) {
418				if (setfile(curr->fts_statp, -1))
419					rval = 1;
420#ifdef __APPLE__
421				/* setfile will fail if writeattr is denied */
422				if (copyfile(curr->fts_path, to.p_path, NULL, COPYFILE_ACL)<0)
423					warn("%s: unable to copy ACL to %s", curr->fts_path, to.p_path);
424#else  /* !__APPLE__ */
425				if (preserve_dir_acls(curr->fts_statp,
426				    curr->fts_accpath, to.p_path) != 0)
427					rval = 1;
428#endif /* __APPLE__ */
429			} else {
430				mode = curr->fts_statp->st_mode;
431				if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) ||
432				    ((mode | S_IRWXU) & mask) != (mode & mask))
433					if (chmod(to.p_path, mode & mask) != 0){
434						warn("chmod: %s", to.p_path);
435						rval = 1;
436					}
437			}
438			continue;
439		}
440
441		/* Not an error but need to remember it happened */
442		if (stat(to.p_path, &to_stat) == -1)
443			dne = 1;
444		else {
445			if (to_stat.st_dev == curr->fts_statp->st_dev &&
446			    to_stat.st_ino == curr->fts_statp->st_ino) {
447				warnx("%s and %s are identical (not copied).",
448				    to.p_path, curr->fts_path);
449				rval = 1;
450				if (S_ISDIR(curr->fts_statp->st_mode))
451					(void)fts_set(ftsp, curr, FTS_SKIP);
452				continue;
453			}
454			if (!S_ISDIR(curr->fts_statp->st_mode) &&
455			    S_ISDIR(to_stat.st_mode)) {
456				warnx("cannot overwrite directory %s with "
457				    "non-directory %s",
458				    to.p_path, curr->fts_path);
459				rval = 1;
460				continue;
461			}
462			dne = 0;
463		}
464
465		switch (curr->fts_statp->st_mode & S_IFMT) {
466		case S_IFLNK:
467			/* Catch special case of a non-dangling symlink */
468			if ((fts_options & FTS_LOGICAL) ||
469			    ((fts_options & FTS_COMFOLLOW) &&
470			    curr->fts_level == 0)) {
471				if (copy_file(curr, dne))
472					badcp = rval = 1;
473			} else {
474				if (copy_link(curr, !dne))
475					badcp = rval = 1;
476			}
477			break;
478		case S_IFDIR:
479			if (!Rflag && !rflag) {
480				warnx("%s is a directory (not copied).",
481				    curr->fts_path);
482				(void)fts_set(ftsp, curr, FTS_SKIP);
483				badcp = rval = 1;
484				break;
485			}
486			/*
487			 * If the directory doesn't exist, create the new
488			 * one with the from file mode plus owner RWX bits,
489			 * modified by the umask.  Trade-off between being
490			 * able to write the directory (if from directory is
491			 * 555) and not causing a permissions race.  If the
492			 * umask blocks owner writes, we fail..
493			 */
494			if (dne) {
495				if (mkdir(to.p_path,
496					  curr->fts_statp->st_mode | S_IRWXU) < 0) {
497					if (COMPAT_MODE("bin/cp", "unix2003")) {
498						warn("%s", to.p_path);
499					} else {
500						err(1, "%s", to.p_path);
501					}
502				}
503			} else if (!S_ISDIR(to_stat.st_mode)) {
504				errno = ENOTDIR;
505				if (COMPAT_MODE("bin/cp", "unix2003")) {
506					warn("%s", to.p_path);
507				} else {
508					err(1, "%s", to.p_path);
509				}
510			}
511			/*
512			 * Arrange to correct directory attributes later
513			 * (in the post-order phase) if this is a new
514			 * directory, or if the -p flag is in effect.
515			 */
516			curr->fts_number = pflag || dne;
517#ifdef __APPLE__
518			if (!Xflag) {
519				if (copyfile(curr->fts_path, to.p_path, NULL, COPYFILE_XATTR) < 0)
520					warn("%s: unable to copy extended attributes to %s", curr->fts_path, to.p_path);
521				/* ACL and mtime set in postorder traversal */
522			}
523#endif /* __APPLE__ */
524			break;
525		case S_IFBLK:
526		case S_IFCHR:
527			if (Rflag) {
528				if (copy_special(curr->fts_statp, !dne))
529					badcp = rval = 1;
530			} else {
531				if (copy_file(curr, dne))
532					badcp = rval = 1;
533			}
534			break;
535		case S_IFIFO:
536			if (Rflag) {
537				if (copy_fifo(curr->fts_statp, !dne))
538					badcp = rval = 1;
539			} else {
540				if (copy_file(curr, dne))
541					badcp = rval = 1;
542			}
543			break;
544		default:
545			if (copy_file(curr, dne))
546				badcp = rval = 1;
547			break;
548		}
549		if (vflag && !badcp)
550			(void)printf("%s -> %s\n", curr->fts_path, to.p_path);
551	}
552	if (errno)
553		err(1, "fts_read");
554	fts_close(ftsp);
555	return (rval);
556}
557
558static void
559siginfo(int sig __unused)
560{
561
562	info = 1;
563}
564