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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, Pflag, ch, fts_options, r, have_trailing_slash;
102         char *target;
103
104         fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
105         Hflag = Lflag = Pflag = 0;
106         while ((ch = getopt(argc, argv, "HLPRafilnprvx")) != -1)
107                 switch (ch) {
108                 case 'H':
109                         Hflag = 1;
110                         Lflag = Pflag = 0;
111                         break;
112                 case 'L':
113                         Lflag = 1;
114                         Hflag = Pflag = 0;
115                         break;
116                 case 'P':
117                         Pflag = 1;
118                         Hflag = Lflag = 0;
119                         break;
120                 case 'R':
121                         Rflag = 1;
122                         break;
123                 case 'a':
124                         Pflag = 1;
125                         pflag = 1;
126                         Rflag = 1;
127                         Hflag = Lflag = 0;
128                         break;
129                 case 'f':
130                         fflag = 1;
131                         iflag = nflag = 0;
132                         break;
133                 case 'i':
134                         iflag = 1;
135                         fflag = nflag = 0;
136                         break;
137                 case 'l':
138                         lflag = 1;
139                         break;
140                 case 'n':
141                         nflag = 1;
142                         fflag = iflag = 0;
143                         break;
144                 case 'p':
145                         pflag = 1;
146                         break;
147                 case 'r':
148                         rflag = Lflag = 1;
149                         Hflag = Pflag = 0;
150                         break;
151                 case 'v':
152                         vflag = 1;
153                         break;
154                 case 'x':
155                         fts_options |= FTS_XDEV;
156                         break;
157                 default:
158                         usage();
159                         break;
160                 }
161         argc -= optind;
162         argv += optind;
163
164         if (argc < 2)
165                 usage();
166
167         if (Rflag && rflag)
168                 errx(1, "the -R and -r options may not be specified together");
169         if (rflag)
170                 Rflag = 1;
171         if (Rflag) {
172                 if (Hflag)
173                         fts_options |= FTS_COMFOLLOW;
174                 if (Lflag) {
175                         fts_options &= ~FTS_PHYSICAL;
176                         fts_options |= FTS_LOGICAL;
177                 }
178         } else {
179                 fts_options &= ~FTS_PHYSICAL;
180                 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW;
181         }
182         (void)signal(SIGINFO, siginfo);
183
184         /* Save the target base in "to". */
185         target = argv[--argc];
186         if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path))
187                 errx(1, "%s: name too long", target);
188         to.p_end = to.p_path + strlen(to.p_path);
189         if (to.p_path == to.p_end) {
190                 *to.p_end++ = '.';
191                 *to.p_end = 0;
192         }
193         have_trailing_slash = (to.p_end[-1] == '/');
194         if (have_trailing_slash)
195                 STRIP_TRAILING_SLASH(to);
196         to.target_end = to.p_end;
197
198         /* Set end of argument list for fts(3). */
199         argv[argc] = NULL;
200
201         /*
202          * Cp has two distinct cases:
203          *
204          * cp [-R] source target
205          * cp [-R] source1 ... sourceN directory
206          *
207          * In both cases, source can be either a file or a directory.
208          *
209          * In (1), the target becomes a copy of the source. That is, if the
210          * source is a file, the target will be a file, and likewise for
211          * directories.
212          *
213          * In (2), the real target is not directory, but "directory/source".
214          */
215         r = stat(to.p_path, &to_stat);
216         if (r == -1 && errno != ENOENT)
217                 err(1, "%s", to.p_path);
218         if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
219                 /*
220                  * Case (1).  Target is not a directory.
221                  */
222                 if (argc > 1)
223                         errx(1, "%s is not a directory", to.p_path);
224
225                 /*
226                  * Need to detect the case:
227                  *      cp -R dir foo
228                  * Where dir is a directory and foo does not exist, where
229                  * we want pathname concatenations turned on but not for
230                  * the initial mkdir().
231                  */
232                 if (r == -1) {
233                         if (Rflag && (Lflag || Hflag))
234                                 stat(*argv, &tmp_stat);
235                         else
236                                 lstat(*argv, &tmp_stat);
237
238                         if (S_ISDIR(tmp_stat.st_mode) && Rflag)
239                                 type = DIR_TO_DNE;
240                         else
241                                 type = FILE_TO_FILE;
242                 } else
243                         type = FILE_TO_FILE;
244
245                 if (have_trailing_slash && type == FILE_TO_FILE) {
246                         if (r == -1)
247                                 errx(1, "directory %s does not exist",
248                                      to.p_path);
249                         else
250                                 errx(1, "%s is not a directory", to.p_path);
251                 }
252         } else
253                 /*
254                  * Case (2).  Target is a directory.
255                  */
256                 type = FILE_TO_DIR;
257
258         exit (copy(argv, type, fts_options));
259 }
260
261 static int
262 copy(char *argv[], enum op type, int fts_options)
263 {
264         struct stat to_stat;
265         FTS *ftsp;
266         FTSENT *curr;
267         int base = 0, dne, badcp, rval;
268         size_t nlen;
269         char *p, *target_mid;
270         mode_t mask, mode;
271
272         /*
273          * Keep an inverted copy of the umask, for use in correcting
274          * permissions on created directories when not using -p.
275          */
276         mask = ~umask(0777);
277         umask(~mask);
278
279         if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL)
280                 err(1, "fts_open");
281         for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) {
282                 switch (curr->fts_info) {
283                 case FTS_NS:
284                 case FTS_DNR:
285                 case FTS_ERR:
286                         warnx("%s: %s",
287                             curr->fts_path, strerror(curr->fts_errno));
288                         badcp = rval = 1;
289                         continue;
290                 case FTS_DC:                    /* Warn, continue. */
291                         warnx("%s: directory causes a cycle", curr->fts_path);
292                         badcp = rval = 1;
293                         continue;
294                 default:
295                         ;
296                 }
297
298                 /*
299                  * If we are in case (2) or (3) above, we need to append the
300                  * source name to the target name.
301                  */
302                 if (type != FILE_TO_FILE) {
303                         /*
304                          * Need to remember the roots of traversals to create
305                          * correct pathnames.  If there's a directory being
306                          * copied to a non-existent directory, e.g.
307                          *      cp -R a/dir noexist
308                          * the resulting path name should be noexist/foo, not
309                          * noexist/dir/foo (where foo is a file in dir), which
310                          * is the case where the target exists.
311                          *
312                          * Also, check for "..".  This is for correct path
313                          * concatenation for paths ending in "..", e.g.
314                          *      cp -R .. /tmp
315                          * Paths ending in ".." are changed to ".".  This is
316                          * tricky, but seems the easiest way to fix the problem.
317                          *
318                          * XXX
319                          * Since the first level MUST be FTS_ROOTLEVEL, base
320                          * is always initialized.
321                          */
322                         if (curr->fts_level == FTS_ROOTLEVEL) {
323                                 if (type != DIR_TO_DNE) {
324                                         p = strrchr(curr->fts_path, '/');
325                                         base = (p == NULL) ? 0 :
326                                             (int)(p - curr->fts_path + 1);
327
328                                         if (!strcmp(&curr->fts_path[base],
329                                             ".."))
330                                                 base += 1;
331                                 } else
332                                         base = curr->fts_pathlen;
333                         }
334
335                         p = &curr->fts_path[base];
336                         nlen = curr->fts_pathlen - base;
337                         target_mid = to.target_end;
338                         if (*p != '/' && target_mid[-1] != '/')
339                                 *target_mid++ = '/';
340                         *target_mid = 0;
341                         if (target_mid - to.p_path + nlen >= PATH_MAX) {
342                                 warnx("%s%s: name too long (not copied)",
343                                     to.p_path, p);
344                                 badcp = rval = 1;
345                                 continue;
346                         }
347                         (void)strncat(target_mid, p, nlen);
348                         to.p_end = target_mid + nlen;
349                         *to.p_end = 0;
350                         STRIP_TRAILING_SLASH(to);
351                 }
352
353                 if (curr->fts_info == FTS_DP) {
354                         /*
355                          * We are nearly finished with this directory.  If we
356                          * didn't actually copy it, or otherwise don't need to
357                          * change its attributes, then we are done.
358                          */
359                         if (!curr->fts_number)
360                                 continue;
361                         /*
362                          * If -p is in effect, set all the attributes.
363                          * Otherwise, set the correct permissions, limited
364                          * by the umask.  Optimise by avoiding a chmod()
365                          * if possible (which is usually the case if we
366                          * made the directory).  Note that mkdir() does not
367                          * honour setuid, setgid and sticky bits, but we
368                          * normally want to preserve them on directories.
369                          */
370                         if (pflag) {
371                                 if (setfile(curr->fts_statp, -1))
372                                         rval = 1;
373                                 if (preserve_dir_acls(curr->fts_statp,
374                                     curr->fts_accpath, to.p_path) != 0)
375                                         rval = 1;
376                         } else {
377                                 mode = curr->fts_statp->st_mode;
378                                 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) ||
379                                     ((mode | S_IRWXU) & mask) != (mode & mask))
380                                         if (chmod(to.p_path, mode & mask) != 0){
381                                                 warn("chmod: %s", to.p_path);
382                                                 rval = 1;
383                                         }
384                         }
385                         continue;
386                 }
387
388                 /* Not an error but need to remember it happened */
389                 if (stat(to.p_path, &to_stat) == -1)
390                         dne = 1;
391                 else {
392                         if (to_stat.st_dev == curr->fts_statp->st_dev &&
393                             to_stat.st_ino == curr->fts_statp->st_ino) {
394                                 warnx("%s and %s are identical (not copied).",
395                                     to.p_path, curr->fts_path);
396                                 badcp = rval = 1;
397                                 if (S_ISDIR(curr->fts_statp->st_mode))
398                                         (void)fts_set(ftsp, curr, FTS_SKIP);
399                                 continue;
400                         }
401                         if (!S_ISDIR(curr->fts_statp->st_mode) &&
402                             S_ISDIR(to_stat.st_mode)) {
403                                 warnx("cannot overwrite directory %s with "
404                                     "non-directory %s",
405                                     to.p_path, curr->fts_path);
406                                 badcp = rval = 1;
407                                 continue;
408                         }
409                         dne = 0;
410                 }
411
412                 switch (curr->fts_statp->st_mode & S_IFMT) {
413                 case S_IFLNK:
414                         /* Catch special case of a non-dangling symlink */
415                         if ((fts_options & FTS_LOGICAL) ||
416                             ((fts_options & FTS_COMFOLLOW) &&
417                             curr->fts_level == 0)) {
418                                 if (copy_file(curr, dne))
419                                         badcp = rval = 1;
420                         } else {        
421                                 if (copy_link(curr, !dne))
422                                         badcp = rval = 1;
423                         }
424                         break;
425                 case S_IFDIR:
426                         if (!Rflag) {
427                                 warnx("%s is a directory (not copied).",
428                                     curr->fts_path);
429                                 (void)fts_set(ftsp, curr, FTS_SKIP);
430                                 badcp = rval = 1;
431                                 break;
432                         }
433                         /*
434                          * If the directory doesn't exist, create the new
435                          * one with the from file mode plus owner RWX bits,
436                          * modified by the umask.  Trade-off between being
437                          * able to write the directory (if from directory is
438                          * 555) and not causing a permissions race.  If the
439                          * umask blocks owner writes, we fail..
440                          */
441                         if (dne) {
442                                 if (mkdir(to.p_path,
443                                     curr->fts_statp->st_mode | S_IRWXU) < 0)
444                                         err(1, "%s", to.p_path);
445                         } else if (!S_ISDIR(to_stat.st_mode)) {
446                                 errno = ENOTDIR;
447                                 err(1, "%s", to.p_path);
448                         }
449                         /*
450                          * Arrange to correct directory attributes later
451                          * (in the post-order phase) if this is a new
452                          * directory, or if the -p flag is in effect.
453                          */
454                         curr->fts_number = pflag || dne;
455                         break;
456                 case S_IFBLK:
457                 case S_IFCHR:
458                         if (Rflag) {
459                                 if (copy_special(curr->fts_statp, !dne))
460                                         badcp = rval = 1;
461                         } else {
462                                 if (copy_file(curr, dne))
463                                         badcp = rval = 1;
464                         }
465                         break;
466                 case S_IFSOCK:
467                         warnx("%s is a socket (not copied).",
468                                     curr->fts_path);
469                 case S_IFIFO:
470                         if (Rflag) {
471                                 if (copy_fifo(curr->fts_statp, !dne))
472                                         badcp = rval = 1;
473                         } else {
474                                 if (copy_file(curr, dne))
475                                         badcp = rval = 1;
476                         }
477                         break;
478                 default:
479                         if (copy_file(curr, dne))
480                                 badcp = rval = 1;
481                         break;
482                 }
483                 if (vflag && !badcp)
484                         (void)printf("%s -> %s\n", curr->fts_path, to.p_path);
485         }
486         if (errno)
487                 err(1, "fts_read");
488         fts_close(ftsp);
489         return (rval);
490 }
491
492 /*
493  * mastercmp --
494  *      The comparison function for the copy order.  The order is to copy
495  *      non-directory files before directory files.  The reason for this
496  *      is because files tend to be in the same cylinder group as their
497  *      parent directory, whereas directories tend not to be.  Copying the
498  *      files first reduces seeking.
499  */
500 static int
501 mastercmp(const FTSENT * const *a, const FTSENT * const *b)
502 {
503         int a_info, b_info;
504
505         a_info = (*a)->fts_info;
506         if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR)
507                 return (0);
508         b_info = (*b)->fts_info;
509         if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR)
510                 return (0);
511         if (a_info == FTS_D)
512                 return (-1);
513         if (b_info == FTS_D)
514                 return (1);
515         return (0);
516 }
517
518 static void
519 siginfo(int sig __unused)
520 {
521
522         info = 1;
523 }