1 /* $NetBSD: cp.c,v 1.58 2012/01/04 15:58:37 christos Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * David Hitz of Auspex Systems Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 #ifndef lint
37 __COPYRIGHT(
38 "@(#) Copyright (c) 1988, 1993, 1994\
39 The Regents of the University of California. All rights reserved.");
40 #endif /* not lint */
41
42 #ifndef lint
43 #if 0
44 static char sccsid[] = "@(#)cp.c 8.5 (Berkeley) 4/29/95";
45 #else
46 __RCSID("$NetBSD: cp.c,v 1.58 2012/01/04 15:58:37 christos Exp $");
47 #endif
48 #endif /* not lint */
49
50 /*
51 * Cp copies source files to target files.
52 *
53 * The global PATH_T structure "to" always contains the path to the
54 * current target file. Since fts(3) does not change directories,
55 * this path can be either absolute or dot-relative.
56 *
57 * The basic algorithm is to initialize "to" and use fts(3) to traverse
58 * the file hierarchy rooted in the argument list. A trivial case is the
59 * case of 'cp file1 file2'. The more interesting case is the case of
60 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the
61 * path (relative to the root of the traversal) is appended to dir (stored
62 * in "to") to form the final target path.
63 */
64
65 #include <sys/param.h>
66 #include <sys/stat.h>
67
68 #include <assert.h>
69 #include <err.h>
70 #include <errno.h>
71 #include <fts.h>
72 #include <locale.h>
73 #include <signal.h>
74 #include <stdlib.h>
75 #include <stdio.h>
76 #include <string.h>
77 #include <unistd.h>
78
79 #include "extern.h"
80
81 #define STRIP_TRAILING_SLASH(p) { \
82 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \
83 *--(p).p_end = '\0'; \
84 }
85
86 static char empty[] = "";
87 PATH_T to = { .p_end = to.p_path, .target_end = empty };
88
89 uid_t myuid;
90 int Hflag, Lflag, Rflag, Pflag, fflag, iflag, lflag, pflag, rflag, vflag, Nflag;
91 mode_t myumask;
92 sig_atomic_t pinfo;
93
94 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
95
96 static int copy(char *[], enum op, int);
97
98 static void
progress(int sig __unused)99 progress(int sig __unused)
100 {
101
102 pinfo++;
103 }
104
105 int
cp_main(int argc,char * argv[])106 cp_main(int argc, char *argv[])
107 {
108 struct stat to_stat, tmp_stat;
109 enum op type;
110 int ch, fts_options, r, have_trailing_slash;
111 char *target, **src;
112
113 #ifndef ANDROID
114 setprogname(argv[0]);
115 #endif
116 (void)setlocale(LC_ALL, "");
117
118 Hflag = Lflag = Pflag = Rflag = 0;
119 while ((ch = getopt(argc, argv, "HLNPRfailprv")) != -1)
120 switch (ch) {
121 case 'H':
122 Hflag = 1;
123 Lflag = Pflag = 0;
124 break;
125 case 'L':
126 Lflag = 1;
127 Hflag = Pflag = 0;
128 break;
129 case 'N':
130 Nflag = 1;
131 break;
132 case 'P':
133 Pflag = 1;
134 Hflag = Lflag = 0;
135 break;
136 case 'R':
137 Rflag = 1;
138 break;
139 case 'a':
140 Pflag = 1;
141 pflag = 1;
142 Rflag = 1;
143 Hflag = Lflag = 0;
144 break;
145 case 'f':
146 fflag = 1;
147 iflag = 0;
148 break;
149 case 'i':
150 iflag = isatty(fileno(stdin));
151 fflag = 0;
152 break;
153 case 'l':
154 lflag = 1;
155 break;
156 case 'p':
157 pflag = 1;
158 break;
159 case 'r':
160 rflag = 1;
161 break;
162 case 'v':
163 vflag = 1;
164 break;
165 case '?':
166 default:
167 cp_usage();
168 /* NOTREACHED */
169 }
170 argc -= optind;
171 argv += optind;
172
173 if (argc < 2)
174 cp_usage();
175
176 fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
177 if (rflag) {
178 if (Rflag) {
179 errx(EXIT_FAILURE,
180 "the -R and -r options may not be specified together.");
181 /* NOTREACHED */
182 }
183 if (Hflag || Lflag || Pflag) {
184 errx(EXIT_FAILURE,
185 "the -H, -L, and -P options may not be specified with the -r option.");
186 /* NOTREACHED */
187 }
188 fts_options &= ~FTS_PHYSICAL;
189 fts_options |= FTS_LOGICAL;
190 }
191
192 if (Rflag) {
193 if (Hflag)
194 fts_options |= FTS_COMFOLLOW;
195 if (Lflag) {
196 fts_options &= ~FTS_PHYSICAL;
197 fts_options |= FTS_LOGICAL;
198 }
199 } else if (!Pflag) {
200 fts_options &= ~FTS_PHYSICAL;
201 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW;
202 }
203
204 myuid = getuid();
205
206 /* Copy the umask for explicit mode setting. */
207 myumask = umask(0);
208 (void)umask(myumask);
209
210 /* Save the target base in "to". */
211 target = argv[--argc];
212 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path))
213 errx(EXIT_FAILURE, "%s: name too long", target);
214 to.p_end = to.p_path + strlen(to.p_path);
215 have_trailing_slash = (to.p_end[-1] == '/');
216 if (have_trailing_slash)
217 STRIP_TRAILING_SLASH(to);
218 to.target_end = to.p_end;
219
220 /* Set end of argument list for fts(3). */
221 argv[argc] = NULL;
222
223 #ifndef ANDROID
224 (void)signal(SIGINFO, progress);
225 #endif
226
227 /*
228 * Cp has two distinct cases:
229 *
230 * cp [-R] source target
231 * cp [-R] source1 ... sourceN directory
232 *
233 * In both cases, source can be either a file or a directory.
234 *
235 * In (1), the target becomes a copy of the source. That is, if the
236 * source is a file, the target will be a file, and likewise for
237 * directories.
238 *
239 * In (2), the real target is not directory, but "directory/source".
240 */
241 if (Pflag)
242 r = lstat(to.p_path, &to_stat);
243 else
244 r = stat(to.p_path, &to_stat);
245 if (r == -1 && errno != ENOENT) {
246 err(EXIT_FAILURE, "%s", to.p_path);
247 /* NOTREACHED */
248 }
249 if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
250 /*
251 * Case (1). Target is not a directory.
252 */
253 if (argc > 1)
254 cp_usage();
255 /*
256 * Need to detect the case:
257 * cp -R dir foo
258 * Where dir is a directory and foo does not exist, where
259 * we want pathname concatenations turned on but not for
260 * the initial mkdir().
261 */
262 if (r == -1) {
263 if (rflag || (Rflag && (Lflag || Hflag)))
264 r = stat(*argv, &tmp_stat);
265 else
266 r = lstat(*argv, &tmp_stat);
267 if (r == -1) {
268 err(EXIT_FAILURE, "%s", *argv);
269 /* NOTREACHED */
270 }
271
272 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag))
273 type = DIR_TO_DNE;
274 else
275 type = FILE_TO_FILE;
276 } else
277 type = FILE_TO_FILE;
278
279 if (have_trailing_slash && type == FILE_TO_FILE) {
280 if (r == -1)
281 errx(1, "directory %s does not exist",
282 to.p_path);
283 else
284 errx(1, "%s is not a directory", to.p_path);
285 }
286 } else {
287 /*
288 * Case (2). Target is a directory.
289 */
290 type = FILE_TO_DIR;
291 }
292
293 /*
294 * make "cp -rp src/ dst" behave like "cp -rp src dst" not
295 * like "cp -rp src/. dst"
296 */
297 for (src = argv; *src; src++) {
298 size_t len = strlen(*src);
299 while (len-- > 1 && (*src)[len] == '/')
300 (*src)[len] = '\0';
301 }
302
303 exit(copy(argv, type, fts_options));
304 /* NOTREACHED */
305 }
306
307 static int dnestack[MAXPATHLEN]; /* unlikely we'll have more nested dirs */
308 static ssize_t dnesp;
309 static void
pushdne(int dne)310 pushdne(int dne)
311 {
312
313 dnestack[dnesp++] = dne;
314 assert(dnesp < MAXPATHLEN);
315 }
316
317 static int
popdne(void)318 popdne(void)
319 {
320 int rv;
321
322 rv = dnestack[--dnesp];
323 assert(dnesp >= 0);
324 return rv;
325 }
326
327 static int
copy(char * argv[],enum op type,int fts_options)328 copy(char *argv[], enum op type, int fts_options)
329 {
330 struct stat to_stat;
331 FTS *ftsp;
332 FTSENT *curr;
333 int base, dne, sval;
334 int this_failed, any_failed;
335 size_t nlen;
336 char *p, *target_mid;
337
338 base = 0; /* XXX gcc -Wuninitialized (see comment below) */
339
340 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL)
341 err(EXIT_FAILURE, "%s", argv[0]);
342 /* NOTREACHED */
343 for (any_failed = 0; (curr = fts_read(ftsp)) != NULL;) {
344 this_failed = 0;
345 switch (curr->fts_info) {
346 case FTS_NS:
347 case FTS_DNR:
348 case FTS_ERR:
349 warnx("%s: %s", curr->fts_path,
350 strerror(curr->fts_errno));
351 this_failed = any_failed = 1;
352 continue;
353 case FTS_DC: /* Warn, continue. */
354 warnx("%s: directory causes a cycle", curr->fts_path);
355 this_failed = any_failed = 1;
356 continue;
357 }
358
359 /*
360 * If we are in case (2) or (3) above, we need to append the
361 * source name to the target name.
362 */
363 if (type != FILE_TO_FILE) {
364 if ((curr->fts_namelen +
365 to.target_end - to.p_path + 1) > MAXPATHLEN) {
366 warnx("%s/%s: name too long (not copied)",
367 to.p_path, curr->fts_name);
368 this_failed = any_failed = 1;
369 continue;
370 }
371
372 /*
373 * Need to remember the roots of traversals to create
374 * correct pathnames. If there's a directory being
375 * copied to a non-existent directory, e.g.
376 * cp -R a/dir noexist
377 * the resulting path name should be noexist/foo, not
378 * noexist/dir/foo (where foo is a file in dir), which
379 * is the case where the target exists.
380 *
381 * Also, check for "..". This is for correct path
382 * concatentation for paths ending in "..", e.g.
383 * cp -R .. /tmp
384 * Paths ending in ".." are changed to ".". This is
385 * tricky, but seems the easiest way to fix the problem.
386 *
387 * XXX
388 * Since the first level MUST be FTS_ROOTLEVEL, base
389 * is always initialized.
390 */
391 if (curr->fts_level == FTS_ROOTLEVEL) {
392 if (type != DIR_TO_DNE) {
393 p = strrchr(curr->fts_path, '/');
394 base = (p == NULL) ? 0 :
395 (int)(p - curr->fts_path + 1);
396
397 if (!strcmp(&curr->fts_path[base],
398 ".."))
399 base += 1;
400 } else
401 base = curr->fts_pathlen;
402 }
403
404 p = &curr->fts_path[base];
405 nlen = curr->fts_pathlen - base;
406 target_mid = to.target_end;
407 if (*p != '/' && target_mid[-1] != '/')
408 *target_mid++ = '/';
409 *target_mid = 0;
410
411 if (target_mid - to.p_path + nlen >= PATH_MAX) {
412 warnx("%s%s: name too long (not copied)",
413 to.p_path, p);
414 this_failed = any_failed = 1;
415 continue;
416 }
417 (void)strncat(target_mid, p, nlen);
418 to.p_end = target_mid + nlen;
419 *to.p_end = 0;
420 STRIP_TRAILING_SLASH(to);
421 }
422
423 sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat);
424 /* Not an error but need to remember it happened */
425 if (sval == -1)
426 dne = 1;
427 else {
428 if (to_stat.st_dev == curr->fts_statp->st_dev &&
429 to_stat.st_ino == curr->fts_statp->st_ino) {
430 warnx("%s and %s are identical (not copied).",
431 to.p_path, curr->fts_path);
432 this_failed = any_failed = 1;
433 if (S_ISDIR(curr->fts_statp->st_mode))
434 (void)fts_set(ftsp, curr, FTS_SKIP);
435 continue;
436 }
437 if (!S_ISDIR(curr->fts_statp->st_mode) &&
438 S_ISDIR(to_stat.st_mode)) {
439 warnx("cannot overwrite directory %s with non-directory %s",
440 to.p_path, curr->fts_path);
441 this_failed = any_failed = 1;
442 continue;
443 }
444 dne = 0;
445 }
446
447 switch (curr->fts_statp->st_mode & S_IFMT) {
448 case S_IFLNK:
449 /* Catch special case of a non dangling symlink */
450 if((fts_options & FTS_LOGICAL) ||
451 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) {
452 if (copy_file(curr, dne))
453 this_failed = any_failed = 1;
454 } else {
455 if (copy_link(curr, !dne))
456 this_failed = any_failed = 1;
457 }
458 break;
459 case S_IFDIR:
460 if (!Rflag && !rflag) {
461 if (curr->fts_info == FTS_D)
462 warnx("%s is a directory (not copied).",
463 curr->fts_path);
464 (void)fts_set(ftsp, curr, FTS_SKIP);
465 this_failed = any_failed = 1;
466 break;
467 }
468
469 /*
470 * Directories get noticed twice:
471 * In the first pass, create it if needed.
472 * In the second pass, after the children have been copied, set the permissions.
473 */
474 if (curr->fts_info == FTS_D) /* First pass */
475 {
476 /*
477 * If the directory doesn't exist, create the new
478 * one with the from file mode plus owner RWX bits,
479 * modified by the umask. Trade-off between being
480 * able to write the directory (if from directory is
481 * 555) and not causing a permissions race. If the
482 * umask blocks owner writes, we fail..
483 */
484 pushdne(dne);
485 if (dne) {
486 if (mkdir(to.p_path,
487 curr->fts_statp->st_mode | S_IRWXU) < 0)
488 err(EXIT_FAILURE, "%s",
489 to.p_path);
490 /* NOTREACHED */
491 } else if (!S_ISDIR(to_stat.st_mode)) {
492 errno = ENOTDIR;
493 err(EXIT_FAILURE, "%s",
494 to.p_path);
495 /* NOTREACHED */
496 }
497 }
498 else if (curr->fts_info == FTS_DP) /* Second pass */
499 {
500 /*
501 * If not -p and directory didn't exist, set it to be
502 * the same as the from directory, umodified by the
503 * umask; arguably wrong, but it's been that way
504 * forever.
505 */
506 if (pflag && setfile(curr->fts_statp, 0))
507 this_failed = any_failed = 1;
508 else if ((dne = popdne()))
509 (void)chmod(to.p_path,
510 curr->fts_statp->st_mode);
511 }
512 else
513 {
514 warnx("directory %s encountered when not expected.",
515 curr->fts_path);
516 this_failed = any_failed = 1;
517 break;
518 }
519
520 break;
521 case S_IFBLK:
522 case S_IFCHR:
523 if (Rflag) {
524 if (copy_special(curr->fts_statp, !dne))
525 this_failed = any_failed = 1;
526 } else
527 if (copy_file(curr, dne))
528 this_failed = any_failed = 1;
529 break;
530 case S_IFIFO:
531 if (Rflag) {
532 if (copy_fifo(curr->fts_statp, !dne))
533 this_failed = any_failed = 1;
534 } else
535 if (copy_file(curr, dne))
536 this_failed = any_failed = 1;
537 break;
538 default:
539 if (copy_file(curr, dne))
540 this_failed = any_failed = 1;
541 break;
542 }
543 if (vflag && !this_failed)
544 (void)printf("%s -> %s\n", curr->fts_path, to.p_path);
545 }
546 if (errno) {
547 err(EXIT_FAILURE, "fts_read");
548 /* NOTREACHED */
549 }
550 (void)fts_close(ftsp);
551 return (any_failed);
552 }
553