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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
35 static 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
41 static char sccsid[] = "@(#)cp.c        8.2 (Berkeley) 4/1/94";
42 #endif /* not lint */
43 #endif
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
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 #include "extern.h"
76
77 #define STRIP_TRAILING_SLASH(p) {                                       \
78         while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/')      \
79                 *--(p).p_end = 0;                                       \
80 }
81
82 static char emptystring[] = "";
83
84 PATH_T to = { to.p_path, emptystring, "" };
85
86 int fflag, iflag, lflag, nflag, pflag, vflag;
87 static int Rflag, rflag;
88 volatile sig_atomic_t info;
89
90 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
91
92 static int copy(char *[], enum op, int);
93 static int mastercmp(const FTSENT * const *, const FTSENT * const *);
94 static void siginfo(int __unused);
95
96 int
97 main(int argc, char *argv[])
98 {
99         struct stat to_stat, tmp_stat;
100         enum op type;
101         int Hflag, Lflag, ch, fts_options, r, have_trailing_slash;
102         char *target;
103
104         fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
105         Hflag = Lflag = 0;
106         while ((ch = getopt(argc, argv, "HLPRafilnprvx")) != -1)
107                 switch (ch) {
108                 case 'H':
109                         Hflag = 1;
110                         Lflag = 0;
111                         break;
112                 case 'L':
113                         Lflag = 1;
114                         Hflag = 0;
115                         break;
116                 case 'P':
117                         Hflag = Lflag = 0;
118                         break;
119                 case 'R':
120                         Rflag = 1;
121                         break;
122                 case 'a':
123                         pflag = 1;
124                         Rflag = 1;
125                         Hflag = Lflag = 0;
126                         break;
127                 case 'f':
128                         fflag = 1;
129                         iflag = nflag = 0;
130                         break;
131                 case 'i':
132                         iflag = 1;
133                         fflag = nflag = 0;
134                         break;
135                 case 'l':
136                         lflag = 1;
137                         break;
138                 case 'n':
139                         nflag = 1;
140                         fflag = iflag = 0;
141                         break;
142                 case 'p':
143                         pflag = 1;
144                         break;
145                 case 'r':
146                         rflag = Lflag = 1;
147                         Hflag = 0;
148                         break;
149                 case 'v':
150                         vflag = 1;
151                         break;
152                 case 'x':
153                         fts_options |= FTS_XDEV;
154                         break;
155                 default:
156                         usage();
157                         break;
158                 }
159         argc -= optind;
160         argv += optind;
161
162         if (argc < 2)
163                 usage();
164
165         if (Rflag && rflag)
166                 errx(1, "the -R and -r options may not be specified together");
167         if (rflag)
168                 Rflag = 1;
169         if (Rflag) {
170                 if (Hflag)
171                         fts_options |= FTS_COMFOLLOW;
172                 if (Lflag) {
173                         fts_options &= ~FTS_PHYSICAL;
174                         fts_options |= FTS_LOGICAL;
175                 }
176         } else {
177                 fts_options &= ~FTS_PHYSICAL;
178                 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW;
179         }
180         (void)signal(SIGINFO, siginfo);
181
182         /* Save the target base in "to". */
183         target = argv[--argc];
184         if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path))
185                 errx(1, "%s: name too long", target);
186         to.p_end = to.p_path + strlen(to.p_path);
187         if (to.p_path == to.p_end) {
188                 *to.p_end++ = '.';
189                 *to.p_end = 0;
190         }
191         have_trailing_slash = (to.p_end[-1] == '/');
192         if (have_trailing_slash)
193                 STRIP_TRAILING_SLASH(to);
194         to.target_end = to.p_end;
195
196         /* Set end of argument list for fts(3). */
197         argv[argc] = NULL;
198
199         /*
200          * Cp has two distinct cases:
201          *
202          * cp [-R] source target
203          * cp [-R] source1 ... sourceN directory
204          *
205          * In both cases, source can be either a file or a directory.
206          *
207          * In (1), the target becomes a copy of the source. That is, if the
208          * source is a file, the target will be a file, and likewise for
209          * directories.
210          *
211          * In (2), the real target is not directory, but "directory/source".
212          */
213         r = stat(to.p_path, &to_stat);
214         if (r == -1 && errno != ENOENT)
215                 err(1, "%s", to.p_path);
216         if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
217                 /*
218                  * Case (1).  Target is not a directory.
219                  */
220                 if (argc > 1)
221                         errx(1, "%s is not a directory", to.p_path);
222
223                 /*
224                  * Need to detect the case:
225                  *      cp -R dir foo
226                  * Where dir is a directory and foo does not exist, where
227                  * we want pathname concatenations turned on but not for
228                  * the initial mkdir().
229                  */
230                 if (r == -1) {
231                         if (Rflag && (Lflag || Hflag))
232                                 stat(*argv, &tmp_stat);
233                         else
234                                 lstat(*argv, &tmp_stat);
235
236                         if (S_ISDIR(tmp_stat.st_mode) && Rflag)
237                                 type = DIR_TO_DNE;
238                         else
239                                 type = FILE_TO_FILE;
240                 } else
241                         type = FILE_TO_FILE;
242
243                 if (have_trailing_slash && type == FILE_TO_FILE) {
244                         if (r == -1)
245                                 errx(1, "directory %s does not exist",
246                                      to.p_path);
247                         else
248                                 errx(1, "%s is not a directory", to.p_path);
249                 }
250         } else
251                 /*
252                  * Case (2).  Target is a directory.
253                  */
254                 type = FILE_TO_DIR;
255
256         exit (copy(argv, type, fts_options));
257 }
258
259 static int
260 copy(char *argv[], enum op type, int fts_options)
261 {
262         struct stat to_stat;
263         FTS *ftsp;
264         FTSENT *curr;
265         int base = 0, dne, badcp, rval;
266         size_t nlen;
267         char *p, *target_mid;
268         mode_t mask, mode;
269
270         /*
271          * Keep an inverted copy of the umask, for use in correcting
272          * permissions on created directories when not using -p.
273          */
274         mask = ~umask(0777);
275         umask(~mask);
276
277         if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL)
278                 err(1, "fts_open");
279         for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) {
280                 switch (curr->fts_info) {
281                 case FTS_NS:
282                 case FTS_DNR:
283                 case FTS_ERR:
284                         warnx("%s: %s",
285                             curr->fts_path, strerror(curr->fts_errno));
286                         badcp = rval = 1;
287                         continue;
288                 case FTS_DC:                    /* Warn, continue. */
289                         warnx("%s: directory causes a cycle", curr->fts_path);
290                         badcp = rval = 1;
291                         continue;
292                 default:
293                         ;
294                 }
295
296                 /*
297                  * If we are in case (2) or (3) above, we need to append the
298                  * source name to the target name.
299                  */
300                 if (type != FILE_TO_FILE) {
301                         /*
302                          * Need to remember the roots of traversals to create
303                          * correct pathnames.  If there's a directory being
304                          * copied to a non-existent directory, e.g.
305                          *      cp -R a/dir noexist
306                          * the resulting path name should be noexist/foo, not
307                          * noexist/dir/foo (where foo is a file in dir), which
308                          * is the case where the target exists.
309                          *
310                          * Also, check for "..".  This is for correct path
311                          * concatenation for paths ending in "..", e.g.
312                          *      cp -R .. /tmp
313                          * Paths ending in ".." are changed to ".".  This is
314                          * tricky, but seems the easiest way to fix the problem.
315                          *
316                          * XXX
317                          * Since the first level MUST be FTS_ROOTLEVEL, base
318                          * is always initialized.
319                          */
320                         if (curr->fts_level == FTS_ROOTLEVEL) {
321                                 if (type != DIR_TO_DNE) {
322                                         p = strrchr(curr->fts_path, '/');
323                                         base = (p == NULL) ? 0 :
324                                             (int)(p - curr->fts_path + 1);
325
326                                         if (!strcmp(&curr->fts_path[base],
327                                             ".."))
328                                                 base += 1;
329                                 } else
330                                         base = curr->fts_pathlen;
331                         }
332
333                         p = &curr->fts_path[base];
334                         nlen = curr->fts_pathlen - base;
335                         target_mid = to.target_end;
336                         if (*p != '/' && target_mid[-1] != '/')
337                                 *target_mid++ = '/';
338                         *target_mid = 0;
339                         if (target_mid - to.p_path + nlen >= PATH_MAX) {
340                                 warnx("%s%s: name too long (not copied)",
341                                     to.p_path, p);
342                                 badcp = rval = 1;
343                                 continue;
344                         }
345                         (void)strncat(target_mid, p, nlen);
346                         to.p_end = target_mid + nlen;
347                         *to.p_end = 0;
348                         STRIP_TRAILING_SLASH(to);
349                 }
350
351                 if (curr->fts_info == FTS_DP) {
352                         /*
353                          * We are nearly finished with this directory.  If we
354                          * didn't actually copy it, or otherwise don't need to
355                          * change its attributes, then we are done.
356                          */
357                         if (!curr->fts_number)
358                                 continue;
359                         /*
360                          * If -p is in effect, set all the attributes.
361                          * Otherwise, set the correct permissions, limited
362                          * by the umask.  Optimise by avoiding a chmod()
363                          * if possible (which is usually the case if we
364                          * made the directory).  Note that mkdir() does not
365                          * honour setuid, setgid and sticky bits, but we
366                          * normally want to preserve them on directories.
367                          */
368                         if (pflag) {
369                                 if (setfile(curr->fts_statp, -1))
370                                         rval = 1;
371                                 if (preserve_dir_acls(curr->fts_statp,
372                                     curr->fts_accpath, to.p_path) != 0)
373                                         rval = 1;
374                         } else {
375                                 mode = curr->fts_statp->st_mode;
376                                 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) ||
377                                     ((mode | S_IRWXU) & mask) != (mode & mask))
378                                         if (chmod(to.p_path, mode & mask) != 0){
379                                                 warn("chmod: %s", to.p_path);
380                                                 rval = 1;
381                                         }
382                         }
383                         continue;
384                 }
385
386                 /* Not an error but need to remember it happened */
387                 if (stat(to.p_path, &to_stat) == -1)
388                         dne = 1;
389                 else {
390                         if (to_stat.st_dev == curr->fts_statp->st_dev &&
391                             to_stat.st_ino == curr->fts_statp->st_ino) {
392                                 warnx("%s and %s are identical (not copied).",
393                                     to.p_path, curr->fts_path);
394                                 badcp = rval = 1;
395                                 if (S_ISDIR(curr->fts_statp->st_mode))
396                                         (void)fts_set(ftsp, curr, FTS_SKIP);
397                                 continue;
398                         }
399                         if (!S_ISDIR(curr->fts_statp->st_mode) &&
400                             S_ISDIR(to_stat.st_mode)) {
401                                 warnx("cannot overwrite directory %s with "
402                                     "non-directory %s",
403                                     to.p_path, curr->fts_path);
404                                 badcp = rval = 1;
405                                 continue;
406                         }
407                         dne = 0;
408                 }
409
410                 switch (curr->fts_statp->st_mode & S_IFMT) {
411                 case S_IFLNK:
412                         /* Catch special case of a non-dangling symlink */
413                         if ((fts_options & FTS_LOGICAL) ||
414                             ((fts_options & FTS_COMFOLLOW) &&
415                             curr->fts_level == 0)) {
416                                 if (copy_file(curr, dne))
417                                         badcp = rval = 1;
418                         } else {        
419                                 if (copy_link(curr, !dne))
420                                         badcp = rval = 1;
421                         }
422                         break;
423                 case S_IFDIR:
424                         if (!Rflag) {
425                                 warnx("%s is a directory (not copied).",
426                                     curr->fts_path);
427                                 (void)fts_set(ftsp, curr, FTS_SKIP);
428                                 badcp = rval = 1;
429                                 break;
430                         }
431                         /*
432                          * If the directory doesn't exist, create the new
433                          * one with the from file mode plus owner RWX bits,
434                          * modified by the umask.  Trade-off between being
435                          * able to write the directory (if from directory is
436                          * 555) and not causing a permissions race.  If the
437                          * umask blocks owner writes, we fail..
438                          */
439                         if (dne) {
440                                 if (mkdir(to.p_path,
441                                     curr->fts_statp->st_mode | S_IRWXU) < 0)
442                                         err(1, "%s", to.p_path);
443                         } else if (!S_ISDIR(to_stat.st_mode)) {
444                                 errno = ENOTDIR;
445                                 err(1, "%s", to.p_path);
446                         }
447                         /*
448                          * Arrange to correct directory attributes later
449                          * (in the post-order phase) if this is a new
450                          * directory, or if the -p flag is in effect.
451                          */
452                         curr->fts_number = pflag || dne;
453                         break;
454                 case S_IFBLK:
455                 case S_IFCHR:
456                         if (Rflag) {
457                                 if (copy_special(curr->fts_statp, !dne))
458                                         badcp = rval = 1;
459                         } else {
460                                 if (copy_file(curr, dne))
461                                         badcp = rval = 1;
462                         }
463                         break;
464                 case S_IFSOCK:
465                         warnx("%s is a socket (not copied).",
466                                     curr->fts_path);
467                         break;
468                 case S_IFIFO:
469                         if (Rflag) {
470                                 if (copy_fifo(curr->fts_statp, !dne))
471                                         badcp = rval = 1;
472                         } else {
473                                 if (copy_file(curr, dne))
474                                         badcp = rval = 1;
475                         }
476                         break;
477                 default:
478                         if (copy_file(curr, dne))
479                                 badcp = rval = 1;
480                         break;
481                 }
482                 if (vflag && !badcp)
483                         (void)printf("%s -> %s\n", curr->fts_path, to.p_path);
484         }
485         if (errno)
486                 err(1, "fts_read");
487         fts_close(ftsp);
488         return (rval);
489 }
490
491 /*
492  * mastercmp --
493  *      The comparison function for the copy order.  The order is to copy
494  *      non-directory files before directory files.  The reason for this
495  *      is because files tend to be in the same cylinder group as their
496  *      parent directory, whereas directories tend not to be.  Copying the
497  *      files first reduces seeking.
498  */
499 static int
500 mastercmp(const FTSENT * const *a, const FTSENT * const *b)
501 {
502         int a_info, b_info;
503
504         a_info = (*a)->fts_info;
505         if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR)
506                 return (0);
507         b_info = (*b)->fts_info;
508         if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR)
509                 return (0);
510         if (a_info == FTS_D)
511                 return (-1);
512         if (b_info == FTS_D)
513                 return (1);
514         return (0);
515 }
516
517 static void
518 siginfo(int sig __unused)
519 {
520
521         info = 1;
522 }