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1 /*-
2  * Copyright (c) 2003-2007 Tim Kientzle
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25
26 #include "bsdtar_platform.h"
27 __FBSDID("$FreeBSD$");
28
29 #ifdef HAVE_SYS_TYPES_H
30 #include <sys/types.h>
31 #endif
32 #ifdef HAVE_SYS_IOCTL_H
33 #include <sys/ioctl.h>
34 #endif
35 #ifdef HAVE_SYS_STAT_H
36 #include <sys/stat.h>
37 #endif
38 #ifdef HAVE_ATTR_XATTR_H
39 #include <attr/xattr.h>
40 #endif
41 #ifdef HAVE_ERRNO_H
42 #include <errno.h>
43 #endif
44 #ifdef HAVE_FCNTL_H
45 #include <fcntl.h>
46 #endif
47 #ifdef HAVE_GRP_H
48 #include <grp.h>
49 #endif
50 #ifdef HAVE_IO_H
51 #include <io.h>
52 #endif
53 #ifdef HAVE_LIMITS_H
54 #include <limits.h>
55 #endif
56 #ifdef HAVE_LINUX_FS_H
57 #include <linux/fs.h>   /* for Linux file flags */
58 #endif
59 /*
60  * Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h.
61  * As the include guards don't agree, the order of include is important.
62  */
63 #ifdef HAVE_LINUX_EXT2_FS_H
64 #include <linux/ext2_fs.h>      /* for Linux file flags */
65 #endif
66 #if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__)
67 /* This header exists but is broken on Cygwin. */
68 #include <ext2fs/ext2_fs.h>
69 #endif
70 #ifdef HAVE_PWD_H
71 #include <pwd.h>
72 #endif
73 #ifdef HAVE_STDINT_H
74 #include <stdint.h>
75 #endif
76 #include <stdio.h>
77 #ifdef HAVE_STDLIB_H
78 #include <stdlib.h>
79 #endif
80 #ifdef HAVE_STRING_H
81 #include <string.h>
82 #endif
83 #ifdef HAVE_UNISTD_H
84 #include <unistd.h>
85 #endif
86
87 #include "bsdtar.h"
88 #include "err.h"
89 #include "line_reader.h"
90 #include "tree.h"
91
92 /* Size of buffer for holding file data prior to writing. */
93 #define FILEDATABUFLEN  65536
94
95 /* Fixed size of uname/gname caches. */
96 #define name_cache_size 101
97
98 #ifndef O_BINARY
99 #define O_BINARY 0
100 #endif
101
102 static const char * const NO_NAME = "(noname)";
103
104 struct archive_dir_entry {
105         struct archive_dir_entry        *next;
106         time_t                   mtime_sec;
107         int                      mtime_nsec;
108         char                    *name;
109 };
110
111 struct archive_dir {
112         struct archive_dir_entry *head, *tail;
113 };
114
115 struct name_cache {
116         int     probes;
117         int     hits;
118         size_t  size;
119         struct {
120                 id_t id;
121                 const char *name;
122         } cache[name_cache_size];
123 };
124
125 static void              add_dir_list(struct bsdtar *bsdtar, const char *path,
126                              time_t mtime_sec, int mtime_nsec);
127 static int               append_archive(struct bsdtar *, struct archive *,
128                              struct archive *ina);
129 static int               append_archive_filename(struct bsdtar *,
130                              struct archive *, const char *fname);
131 static void              archive_names_from_file(struct bsdtar *bsdtar,
132                              struct archive *a);
133 static int               copy_file_data(struct bsdtar *, struct archive *a,
134                              struct archive *ina, struct archive_entry *);
135 static int               new_enough(struct bsdtar *, const char *path,
136                              const struct stat *);
137 static void              report_write(struct bsdtar *, struct archive *,
138                              struct archive_entry *, int64_t progress);
139 static void              test_for_append(struct bsdtar *);
140 static void              write_archive(struct archive *, struct bsdtar *);
141 static void              write_entry_backend(struct bsdtar *, struct archive *,
142                              struct archive_entry *);
143 static int               write_file_data(struct bsdtar *, struct archive *,
144                              struct archive_entry *, int fd);
145 static void              write_hierarchy(struct bsdtar *, struct archive *,
146                              const char *);
147
148 #if defined(_WIN32) && !defined(__CYGWIN__)
149 /* Not a full lseek() emulation, but enough for our needs here. */
150 static int
151 seek_file(int fd, int64_t offset, int whence)
152 {
153         LARGE_INTEGER distance;
154         (void)whence; /* UNUSED */
155         distance.QuadPart = offset;
156         return (SetFilePointerEx((HANDLE)_get_osfhandle(fd),
157                 distance, NULL, FILE_BEGIN) ? 1 : -1);
158 }
159 #define open _open
160 #define close _close
161 #define read _read
162 #define lseek seek_file
163 #endif
164
165 void
166 tar_mode_c(struct bsdtar *bsdtar)
167 {
168         struct archive *a;
169         int r;
170
171         if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL)
172                 lafe_errc(1, 0, "no files or directories specified");
173
174         a = archive_write_new();
175
176         /* Support any format that the library supports. */
177         if (bsdtar->create_format == NULL) {
178                 r = archive_write_set_format_pax_restricted(a);
179                 bsdtar->create_format = "pax restricted";
180         } else {
181                 r = archive_write_set_format_by_name(a, bsdtar->create_format);
182         }
183         if (r != ARCHIVE_OK) {
184                 fprintf(stderr, "Can't use format %s: %s\n",
185                     bsdtar->create_format,
186                     archive_error_string(a));
187                 usage();
188         }
189
190         /*
191          * If user explicitly set the block size, then assume they
192          * want the last block padded as well.  Otherwise, use the
193          * default block size and accept archive_write_open_file()'s
194          * default padding decisions.
195          */
196         if (bsdtar->bytes_per_block != 0) {
197                 archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block);
198                 archive_write_set_bytes_in_last_block(a,
199                     bsdtar->bytes_per_block);
200         } else
201                 archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK);
202
203         if (bsdtar->compress_program) {
204                 archive_write_set_compression_program(a, bsdtar->compress_program);
205         } else {
206                 switch (bsdtar->create_compression) {
207                 case 0:
208                         r = archive_write_set_compression_none(a);
209                         break;
210                 case 'j': case 'y':
211                         r = archive_write_set_compression_bzip2(a);
212                         break;
213                 case 'J':
214                         r = archive_write_set_compression_xz(a);
215                         break;
216                 case OPTION_LZMA:
217                         r = archive_write_set_compression_lzma(a);
218                         break;
219                 case 'z':
220                         r = archive_write_set_compression_gzip(a);
221                         break;
222                 case 'Z':
223                         r = archive_write_set_compression_compress(a);
224                         break;
225                 default:
226                         lafe_errc(1, 0,
227                             "Unrecognized compression option -%c",
228                             bsdtar->create_compression);
229                 }
230                 if (r != ARCHIVE_OK) {
231                         lafe_errc(1, 0,
232                             "Unsupported compression option -%c",
233                             bsdtar->create_compression);
234                 }
235         }
236
237         if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options))
238                 lafe_errc(1, 0, "%s", archive_error_string(a));
239         if (ARCHIVE_OK != archive_write_open_file(a, bsdtar->filename))
240                 lafe_errc(1, 0, "%s", archive_error_string(a));
241         write_archive(a, bsdtar);
242 }
243
244 /*
245  * Same as 'c', except we only support tar or empty formats in
246  * uncompressed files on disk.
247  */
248 void
249 tar_mode_r(struct bsdtar *bsdtar)
250 {
251         int64_t end_offset;
252         int     format;
253         struct archive *a;
254         struct archive_entry *entry;
255         int     r;
256
257         /* Sanity-test some arguments and the file. */
258         test_for_append(bsdtar);
259
260         format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
261
262 #if defined(__BORLANDC__)
263         bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT | O_BINARY);
264 #else
265         bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT | O_BINARY, 0666);
266 #endif
267         if (bsdtar->fd < 0)
268                 lafe_errc(1, errno,
269                     "Cannot open %s", bsdtar->filename);
270
271         a = archive_read_new();
272         archive_read_support_compression_all(a);
273         archive_read_support_format_tar(a);
274         archive_read_support_format_gnutar(a);
275         r = archive_read_open_fd(a, bsdtar->fd, 10240);
276         if (r != ARCHIVE_OK)
277                 lafe_errc(1, archive_errno(a),
278                     "Can't read archive %s: %s", bsdtar->filename,
279                     archive_error_string(a));
280         while (0 == archive_read_next_header(a, &entry)) {
281                 if (archive_compression(a) != ARCHIVE_COMPRESSION_NONE) {
282                         archive_read_finish(a);
283                         close(bsdtar->fd);
284                         lafe_errc(1, 0,
285                             "Cannot append to compressed archive.");
286                 }
287                 /* Keep going until we hit end-of-archive */
288                 format = archive_format(a);
289         }
290
291         end_offset = archive_read_header_position(a);
292         archive_read_finish(a);
293
294         /* Re-open archive for writing */
295         a = archive_write_new();
296         archive_write_set_compression_none(a);
297         /*
298          * Set the format to be used for writing.  To allow people to
299          * extend empty files, we need to allow them to specify the format,
300          * which opens the possibility that they will specify a format that
301          * doesn't match the existing format.  Hence, the following bit
302          * of arcane ugliness.
303          */
304
305         if (bsdtar->create_format != NULL) {
306                 /* If the user requested a format, use that, but ... */
307                 archive_write_set_format_by_name(a,
308                     bsdtar->create_format);
309                 /* ... complain if it's not compatible. */
310                 format &= ARCHIVE_FORMAT_BASE_MASK;
311                 if (format != (int)(archive_format(a) & ARCHIVE_FORMAT_BASE_MASK)
312                     && format != ARCHIVE_FORMAT_EMPTY) {
313                         lafe_errc(1, 0,
314                             "Format %s is incompatible with the archive %s.",
315                             bsdtar->create_format, bsdtar->filename);
316                 }
317         } else {
318                 /*
319                  * Just preserve the current format, with a little care
320                  * for formats that libarchive can't write.
321                  */
322                 if (format == ARCHIVE_FORMAT_TAR_GNUTAR)
323                         /* TODO: When gtar supports pax, use pax restricted. */
324                         format = ARCHIVE_FORMAT_TAR_USTAR;
325                 if (format == ARCHIVE_FORMAT_EMPTY)
326                         format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
327                 archive_write_set_format(a, format);
328         }
329         if (lseek(bsdtar->fd, end_offset, SEEK_SET) < 0)
330                 lafe_errc(1, errno, "Could not seek to archive end");
331         if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options))
332                 lafe_errc(1, 0, "%s", archive_error_string(a));
333         if (ARCHIVE_OK != archive_write_open_fd(a, bsdtar->fd))
334                 lafe_errc(1, 0, "%s", archive_error_string(a));
335
336         write_archive(a, bsdtar); /* XXX check return val XXX */
337
338         close(bsdtar->fd);
339         bsdtar->fd = -1;
340 }
341
342 void
343 tar_mode_u(struct bsdtar *bsdtar)
344 {
345         int64_t                  end_offset;
346         struct archive          *a;
347         struct archive_entry    *entry;
348         int                      format;
349         struct archive_dir_entry        *p;
350         struct archive_dir       archive_dir;
351
352         bsdtar->archive_dir = &archive_dir;
353         memset(&archive_dir, 0, sizeof(archive_dir));
354
355         format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
356
357         /* Sanity-test some arguments and the file. */
358         test_for_append(bsdtar);
359
360         bsdtar->fd = open(bsdtar->filename, O_RDWR | O_BINARY);
361         if (bsdtar->fd < 0)
362                 lafe_errc(1, errno,
363                     "Cannot open %s", bsdtar->filename);
364
365         a = archive_read_new();
366         archive_read_support_compression_all(a);
367         archive_read_support_format_tar(a);
368         archive_read_support_format_gnutar(a);
369         if (archive_read_open_fd(a, bsdtar->fd,
370             bsdtar->bytes_per_block != 0 ? bsdtar->bytes_per_block :
371                 DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
372                 lafe_errc(1, 0,
373                     "Can't open %s: %s", bsdtar->filename,
374                     archive_error_string(a));
375         }
376
377         /* Build a list of all entries and their recorded mod times. */
378         while (0 == archive_read_next_header(a, &entry)) {
379                 if (archive_compression(a) != ARCHIVE_COMPRESSION_NONE) {
380                         archive_read_finish(a);
381                         close(bsdtar->fd);
382                         lafe_errc(1, 0,
383                             "Cannot append to compressed archive.");
384                 }
385                 add_dir_list(bsdtar, archive_entry_pathname(entry),
386                     archive_entry_mtime(entry),
387                     archive_entry_mtime_nsec(entry));
388                 /* Record the last format determination we see */
389                 format = archive_format(a);
390                 /* Keep going until we hit end-of-archive */
391         }
392
393         end_offset = archive_read_header_position(a);
394         archive_read_finish(a);
395
396         /* Re-open archive for writing. */
397         a = archive_write_new();
398         archive_write_set_compression_none(a);
399         /*
400          * Set format to same one auto-detected above, except that
401          * we don't write GNU tar format, so use ustar instead.
402          */
403         if (format == ARCHIVE_FORMAT_TAR_GNUTAR)
404                 format = ARCHIVE_FORMAT_TAR_USTAR;
405         archive_write_set_format(a, format);
406         if (bsdtar->bytes_per_block != 0) {
407                 archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block);
408                 archive_write_set_bytes_in_last_block(a,
409                     bsdtar->bytes_per_block);
410         } else
411                 archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK);
412         if (lseek(bsdtar->fd, end_offset, SEEK_SET) < 0)
413                 lafe_errc(1, errno, "Could not seek to archive end");
414         if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options))
415                 lafe_errc(1, 0, "%s", archive_error_string(a));
416         if (ARCHIVE_OK != archive_write_open_fd(a, bsdtar->fd))
417                 lafe_errc(1, 0, "%s", archive_error_string(a));
418
419         write_archive(a, bsdtar);
420
421         close(bsdtar->fd);
422         bsdtar->fd = -1;
423
424         while (bsdtar->archive_dir->head != NULL) {
425                 p = bsdtar->archive_dir->head->next;
426                 free(bsdtar->archive_dir->head->name);
427                 free(bsdtar->archive_dir->head);
428                 bsdtar->archive_dir->head = p;
429         }
430         bsdtar->archive_dir->tail = NULL;
431 }
432
433
434 /*
435  * Write user-specified files/dirs to opened archive.
436  */
437 static void
438 write_archive(struct archive *a, struct bsdtar *bsdtar)
439 {
440         const char *arg;
441         struct archive_entry *entry, *sparse_entry;
442
443         /* Allocate a buffer for file data. */
444         if ((bsdtar->buff = malloc(FILEDATABUFLEN)) == NULL)
445                 lafe_errc(1, 0, "cannot allocate memory");
446
447         if ((bsdtar->resolver = archive_entry_linkresolver_new()) == NULL)
448                 lafe_errc(1, 0, "cannot create link resolver");
449         archive_entry_linkresolver_set_strategy(bsdtar->resolver,
450             archive_format(a));
451         if ((bsdtar->diskreader = archive_read_disk_new()) == NULL)
452                 lafe_errc(1, 0, "Cannot create read_disk object");
453         archive_read_disk_set_standard_lookup(bsdtar->diskreader);
454
455         if (bsdtar->names_from_file != NULL)
456                 archive_names_from_file(bsdtar, a);
457
458         while (*bsdtar->argv) {
459                 arg = *bsdtar->argv;
460                 if (arg[0] == '-' && arg[1] == 'C') {
461                         arg += 2;
462                         if (*arg == '\0') {
463                                 bsdtar->argv++;
464                                 arg = *bsdtar->argv;
465                                 if (arg == NULL) {
466                                         lafe_warnc(0, "%s",
467                                             "Missing argument for -C");
468                                         bsdtar->return_value = 1;
469                                         goto cleanup;
470                                 }
471                         }
472                         set_chdir(bsdtar, arg);
473                 } else {
474                         if (*arg != '/' && (arg[0] != '@' || arg[1] != '/'))
475                                 do_chdir(bsdtar); /* Handle a deferred -C */
476                         if (*arg == '@') {
477                                 if (append_archive_filename(bsdtar, a,
478                                     arg + 1) != 0)
479                                         break;
480                         } else
481                                 write_hierarchy(bsdtar, a, arg);
482                 }
483                 bsdtar->argv++;
484         }
485
486         entry = NULL;
487         archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry);
488         while (entry != NULL) {
489                 write_entry_backend(bsdtar, a, entry);
490                 archive_entry_free(entry);
491                 entry = NULL;
492                 archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry);
493         }
494
495         if (archive_write_close(a)) {
496                 lafe_warnc(0, "%s", archive_error_string(a));
497                 bsdtar->return_value = 1;
498         }
499
500 cleanup:
501         /* Free file data buffer. */
502         free(bsdtar->buff);
503         archive_entry_linkresolver_free(bsdtar->resolver);
504         bsdtar->resolver = NULL;
505         archive_read_finish(bsdtar->diskreader);
506         bsdtar->diskreader = NULL;
507
508         if (bsdtar->option_totals) {
509                 fprintf(stderr, "Total bytes written: %s\n",
510                     tar_i64toa(archive_position_compressed(a)));
511         }
512
513         archive_write_finish(a);
514 }
515
516 /*
517  * Archive names specified in file.
518  *
519  * Unless --null was specified, a line containing exactly "-C" will
520  * cause the next line to be a directory to pass to chdir().  If
521  * --null is specified, then a line "-C" is just another filename.
522  */
523 static void
524 archive_names_from_file(struct bsdtar *bsdtar, struct archive *a)
525 {
526         struct lafe_line_reader *lr;
527         const char *line;
528
529         bsdtar->next_line_is_dir = 0;
530
531         lr = lafe_line_reader(bsdtar->names_from_file, bsdtar->option_null);
532         while ((line = lafe_line_reader_next(lr)) != NULL) {
533                 if (bsdtar->next_line_is_dir) {
534                         set_chdir(bsdtar, line);
535                         bsdtar->next_line_is_dir = 0;
536                 } else if (!bsdtar->option_null && strcmp(line, "-C") == 0)
537                         bsdtar->next_line_is_dir = 1;
538                 else {
539                         if (*line != '/')
540                                 do_chdir(bsdtar); /* Handle a deferred -C */
541                         write_hierarchy(bsdtar, a, line);
542                 }
543         }
544         lafe_line_reader_free(lr);
545         if (bsdtar->next_line_is_dir)
546                 lafe_errc(1, errno,
547                     "Unexpected end of filename list; "
548                     "directory expected after -C");
549 }
550
551 /*
552  * Copy from specified archive to current archive.  Returns non-zero
553  * for write errors (which force us to terminate the entire archiving
554  * operation).  If there are errors reading the input archive, we set
555  * bsdtar->return_value but return zero, so the overall archiving
556  * operation will complete and return non-zero.
557  */
558 static int
559 append_archive_filename(struct bsdtar *bsdtar, struct archive *a,
560     const char *filename)
561 {
562         struct archive *ina;
563         int rc;
564
565         if (strcmp(filename, "-") == 0)
566                 filename = NULL; /* Library uses NULL for stdio. */
567
568         ina = archive_read_new();
569         archive_read_support_format_all(ina);
570         archive_read_support_compression_all(ina);
571         if (archive_read_open_file(ina, filename, 10240)) {
572                 lafe_warnc(0, "%s", archive_error_string(ina));
573                 bsdtar->return_value = 1;
574                 return (0);
575         }
576
577         rc = append_archive(bsdtar, a, ina);
578
579         if (rc != ARCHIVE_OK) {
580                 lafe_warnc(0, "Error reading archive %s: %s",
581                     filename, archive_error_string(ina));
582                 bsdtar->return_value = 1;
583         }
584         archive_read_finish(ina);
585
586         return (rc);
587 }
588
589 static int
590 append_archive(struct bsdtar *bsdtar, struct archive *a, struct archive *ina)
591 {
592         struct archive_entry *in_entry;
593         int e;
594
595         while (ARCHIVE_OK == (e = archive_read_next_header(ina, &in_entry))) {
596                 if (!new_enough(bsdtar, archive_entry_pathname(in_entry),
597                         archive_entry_stat(in_entry)))
598                         continue;
599                 if (lafe_excluded(bsdtar->matching, archive_entry_pathname(in_entry)))
600                         continue;
601                 if (bsdtar->option_interactive &&
602                     !yes("copy '%s'", archive_entry_pathname(in_entry)))
603                         continue;
604                 if (bsdtar->verbose)
605                         safe_fprintf(stderr, "a %s",
606                             archive_entry_pathname(in_entry));
607                 if (need_report())
608                         report_write(bsdtar, a, in_entry, 0);
609
610                 e = archive_write_header(a, in_entry);
611                 if (e != ARCHIVE_OK) {
612                         if (!bsdtar->verbose)
613                                 lafe_warnc(0, "%s: %s",
614                                     archive_entry_pathname(in_entry),
615                                     archive_error_string(a));
616                         else
617                                 fprintf(stderr, ": %s", archive_error_string(a));
618                 }
619                 if (e == ARCHIVE_FATAL)
620                         exit(1);
621
622                 if (e >= ARCHIVE_WARN) {
623                         if (archive_entry_size(in_entry) == 0)
624                                 archive_read_data_skip(ina);
625                         else if (copy_file_data(bsdtar, a, ina, in_entry))
626                                 exit(1);
627                 }
628
629                 if (bsdtar->verbose)
630                         fprintf(stderr, "\n");
631         }
632
633         return (e == ARCHIVE_EOF ? ARCHIVE_OK : e);
634 }
635
636 /* Helper function to copy data between archives. */
637 static int
638 copy_file_data(struct bsdtar *bsdtar, struct archive *a,
639     struct archive *ina, struct archive_entry *entry)
640 {
641         ssize_t bytes_read;
642         ssize_t bytes_written;
643         int64_t progress = 0;
644
645         bytes_read = archive_read_data(ina, bsdtar->buff, FILEDATABUFLEN);
646         while (bytes_read > 0) {
647                 if (need_report())
648                         report_write(bsdtar, a, entry, progress);
649
650                 bytes_written = archive_write_data(a, bsdtar->buff,
651                     bytes_read);
652                 if (bytes_written < bytes_read) {
653                         lafe_warnc(0, "%s", archive_error_string(a));
654                         return (-1);
655                 }
656                 progress += bytes_written;
657                 bytes_read = archive_read_data(ina, bsdtar->buff,
658                     FILEDATABUFLEN);
659         }
660
661         return (0);
662 }
663
664 /*
665  * Add the file or dir hierarchy named by 'path' to the archive
666  */
667 static void
668 write_hierarchy(struct bsdtar *bsdtar, struct archive *a, const char *path)
669 {
670         struct archive_entry *entry = NULL, *spare_entry = NULL;
671         struct tree *tree;
672         char symlink_mode = bsdtar->symlink_mode;
673         dev_t first_dev = 0;
674         int dev_recorded = 0;
675         int tree_ret;
676
677         tree = tree_open(path);
678
679         if (!tree) {
680                 lafe_warnc(errno, "%s: Cannot open", path);
681                 bsdtar->return_value = 1;
682                 return;
683         }
684
685         while ((tree_ret = tree_next(tree)) != 0) {
686                 int r;
687                 const char *name = tree_current_path(tree);
688                 const struct stat *st = NULL; /* info to use for this entry */
689                 const struct stat *lst = NULL; /* lstat() information */
690                 int descend;
691
692                 if (tree_ret == TREE_ERROR_FATAL)
693                         lafe_errc(1, tree_errno(tree),
694                             "%s: Unable to continue traversing directory tree",
695                             name);
696                 if (tree_ret == TREE_ERROR_DIR) {
697                         lafe_warnc(errno,
698                             "%s: Couldn't visit directory", name);
699                         bsdtar->return_value = 1;
700                 }
701                 if (tree_ret != TREE_REGULAR)
702                         continue;
703
704                 /*
705                  * If this file/dir is excluded by a filename
706                  * pattern, skip it.
707                  */
708                 if (lafe_excluded(bsdtar->matching, name))
709                         continue;
710
711                 /*
712                  * Get lstat() info from the tree library.
713                  */
714                 lst = tree_current_lstat(tree);
715                 if (lst == NULL) {
716                         /* Couldn't lstat(); must not exist. */
717                         lafe_warnc(errno, "%s: Cannot stat", name);
718                         /* Return error if files disappear during traverse. */
719                         bsdtar->return_value = 1;
720                         continue;
721                 }
722
723                 /*
724                  * Distinguish 'L'/'P'/'H' symlink following.
725                  */
726                 switch(symlink_mode) {
727                 case 'H':
728                         /* 'H': After the first item, rest like 'P'. */
729                         symlink_mode = 'P';
730                         /* 'H': First item (from command line) like 'L'. */
731                         /* FALLTHROUGH */
732                 case 'L':
733                         /* 'L': Do descend through a symlink to dir. */
734                         descend = tree_current_is_dir(tree);
735                         /* 'L': Follow symlinks to files. */
736                         archive_read_disk_set_symlink_logical(bsdtar->diskreader);
737                         /* 'L': Archive symlinks as targets, if we can. */
738                         st = tree_current_stat(tree);
739                         if (st != NULL)
740                                 break;
741                         /* If stat fails, we have a broken symlink;
742                          * in that case, don't follow the link. */
743                         /* FALLTHROUGH */
744                 default:
745                         /* 'P': Don't descend through a symlink to dir. */
746                         descend = tree_current_is_physical_dir(tree);
747                         /* 'P': Don't follow symlinks to files. */
748                         archive_read_disk_set_symlink_physical(bsdtar->diskreader);
749                         /* 'P': Archive symlinks as symlinks. */
750                         st = lst;
751                         break;
752                 }
753
754                 if (bsdtar->option_no_subdirs)
755                         descend = 0;
756
757                 /*
758                  * Are we about to cross to a new filesystem?
759                  */
760                 if (!dev_recorded) {
761                         /* This is the initial file system. */
762                         first_dev = lst->st_dev;
763                         dev_recorded = 1;
764                 } else if (lst->st_dev == first_dev) {
765                         /* The starting file system is always acceptable. */
766                 } else if (descend == 0) {
767                         /* We're not descending, so no need to check. */
768                 } else if (bsdtar->option_dont_traverse_mounts) {
769                         descend = 0;
770                 } else {
771                         /* We're prepared to cross a mount point. */
772
773                         /* XXX TODO: check whether this filesystem is
774                          * synthetic and/or local.  Add a new
775                          * --local-only option to skip non-local
776                          * filesystems.  Skip synthetic filesystems
777                          * regardless.
778                          *
779                          * The results should be cached, since
780                          * tree.c doesn't usually visit a directory
781                          * and the directory contents together.  A simple
782                          * move-to-front list should perform quite well.
783                          *
784                          * This is going to be heavily OS dependent:
785                          * FreeBSD's statfs() in conjunction with getvfsbyname()
786                          * provides all of this; NetBSD's statvfs() does
787                          * most of it; other systems will vary.
788                          */
789                 }
790
791                 /*
792                  * In -u mode, check that the file is newer than what's
793                  * already in the archive; in all modes, obey --newerXXX flags.
794                  */
795                 if (!new_enough(bsdtar, name, st)) {
796                         if (!descend)
797                                 continue;
798                         if (bsdtar->option_interactive &&
799                             !yes("add '%s'", name))
800                                 continue;
801                         tree_descend(tree);
802                         continue;
803                 }
804
805                 archive_entry_free(entry);
806                 entry = archive_entry_new();
807
808                 archive_entry_set_pathname(entry, name);
809                 archive_entry_copy_sourcepath(entry,
810                     tree_current_access_path(tree));
811
812                 /* Populate the archive_entry with metadata from the disk. */
813                 /* XXX TODO: Arrange to open a regular file before
814                  * calling this so we can pass in an fd and shorten
815                  * the race to query metadata.  The linkify dance
816                  * makes this more complex than it might sound. */
817 #if defined(_WIN32) && !defined(__CYGWIN__)
818                 /* TODO: tree.c uses stat(), which is badly broken
819                  * on Windows.  To fix this, we should
820                  * deprecate tree_current_stat() and provide a new
821                  * call tree_populate_entry(t, entry).  This call
822                  * would use stat() internally on POSIX and
823                  * GetInfoByFileHandle() internally on Windows.
824                  * This would be another step towards a tree-walker
825                  * that can be integrated deep into libarchive.
826                  * For now, just set st to NULL on Windows;
827                  * archive_read_disk_entry_from_file() should
828                  * be smart enough to use platform-appropriate
829                  * ways to probe file information.
830                  */
831                 st = NULL;
832 #endif
833                 r = archive_read_disk_entry_from_file(bsdtar->diskreader,
834                     entry, -1, st);
835                 if (bsdtar->uid >= 0) {
836                         archive_entry_set_uid(entry, bsdtar->uid);
837                         if (!bsdtar->uname)
838                                 archive_entry_set_uname(entry,
839                                     archive_read_disk_uname(bsdtar->diskreader,
840                                         bsdtar->uid));
841                 }
842                 if (bsdtar->gid >= 0) {
843                         archive_entry_set_gid(entry, bsdtar->gid);
844                         if (!bsdtar->gname)
845                                 archive_entry_set_gname(entry,
846                                     archive_read_disk_gname(bsdtar->diskreader,
847                                         bsdtar->gid));
848                 }
849                 if (bsdtar->uname)
850                         archive_entry_set_uname(entry, bsdtar->uname);
851                 if (bsdtar->gname)
852                         archive_entry_set_gname(entry, bsdtar->gname);
853                 if (r != ARCHIVE_OK)
854                         lafe_warnc(archive_errno(bsdtar->diskreader),
855                             "%s", archive_error_string(bsdtar->diskreader));
856                 if (r < ARCHIVE_WARN)
857                         continue;
858
859                 /* XXX TODO: Just use flag data from entry; avoid the
860                  * duplicate check here. */
861
862                 /*
863                  * If this file/dir is flagged "nodump" and we're
864                  * honoring such flags, skip this file/dir.
865                  */
866 #if defined(HAVE_STRUCT_STAT_ST_FLAGS) && defined(UF_NODUMP)
867                 /* BSD systems store flags in struct stat */
868                 if (bsdtar->option_honor_nodump &&
869                     (lst->st_flags & UF_NODUMP))
870                         continue;
871 #endif
872
873 #if defined(EXT2_IOC_GETFLAGS) && defined(EXT2_NODUMP_FL)
874                 /* Linux uses ioctl to read flags. */
875                 if (bsdtar->option_honor_nodump) {
876                         int fd = open(name, O_RDONLY | O_NONBLOCK | O_BINARY);
877                         if (fd >= 0) {
878                                 unsigned long fflags;
879                                 int r = ioctl(fd, EXT2_IOC_GETFLAGS, &fflags);
880                                 close(fd);
881                                 if (r >= 0 && (fflags & EXT2_NODUMP_FL))
882                                         continue;
883                         }
884                 }
885 #endif
886
887                 /*
888                  * If the user vetoes this file/directory, skip it.
889                  * We want this to be fairly late; if some other
890                  * check would veto this file, we shouldn't bother
891                  * the user with it.
892                  */
893                 if (bsdtar->option_interactive &&
894                     !yes("add '%s'", name))
895                         continue;
896
897                 if (descend)
898                         tree_descend(tree);
899
900                 /*
901                  * Rewrite the pathname to be archived.  If rewrite
902                  * fails, skip the entry.
903                  */
904                 if (edit_pathname(bsdtar, entry))
905                         continue;
906
907                 /* Display entry as we process it.
908                  * This format is required by SUSv2. */
909                 if (bsdtar->verbose)
910                         safe_fprintf(stderr, "a %s",
911                             archive_entry_pathname(entry));
912
913                 /* Non-regular files get archived with zero size. */
914                 if (archive_entry_filetype(entry) != AE_IFREG)
915                         archive_entry_set_size(entry, 0);
916
917                 archive_entry_linkify(bsdtar->resolver, &entry, &spare_entry);
918
919                 while (entry != NULL) {
920                         write_entry_backend(bsdtar, a, entry);
921                         archive_entry_free(entry);
922                         entry = spare_entry;
923                         spare_entry = NULL;
924                 }
925
926                 if (bsdtar->verbose)
927                         fprintf(stderr, "\n");
928         }
929         archive_entry_free(entry);
930         tree_close(tree);
931 }
932
933 /*
934  * Backend for write_entry.
935  */
936 static void
937 write_entry_backend(struct bsdtar *bsdtar, struct archive *a,
938     struct archive_entry *entry)
939 {
940         int fd = -1;
941         int e;
942
943         if (archive_entry_size(entry) > 0) {
944                 const char *pathname = archive_entry_sourcepath(entry);
945                 fd = open(pathname, O_RDONLY | O_BINARY);
946                 if (fd == -1) {
947                         bsdtar->return_value = 1;
948                         if (!bsdtar->verbose)
949                                 lafe_warnc(errno,
950                                     "%s: could not open file", pathname);
951                         else
952                                 fprintf(stderr, ": %s", strerror(errno));
953                         return;
954                 }
955         }
956
957         e = archive_write_header(a, entry);
958         if (e != ARCHIVE_OK) {
959                 if (!bsdtar->verbose)
960                         lafe_warnc(0, "%s: %s",
961                             archive_entry_pathname(entry),
962                             archive_error_string(a));
963                 else
964                         fprintf(stderr, ": %s", archive_error_string(a));
965         }
966
967         if (e == ARCHIVE_FATAL)
968                 exit(1);
969
970         /*
971          * If we opened a file earlier, write it out now.  Note that
972          * the format handler might have reset the size field to zero
973          * to inform us that the archive body won't get stored.  In
974          * that case, just skip the write.
975          */
976         if (e >= ARCHIVE_WARN && fd >= 0 && archive_entry_size(entry) > 0) {
977                 if (write_file_data(bsdtar, a, entry, fd))
978                         exit(1);
979         }
980
981         /*
982          * If we opened a file, close it now even if there was an error
983          * which made us decide not to write the archive body.
984          */
985         if (fd >= 0)
986                 close(fd);
987 }
988
989 static void
990 report_write(struct bsdtar *bsdtar, struct archive *a,
991     struct archive_entry *entry, int64_t progress)
992 {
993         uint64_t comp, uncomp;
994         int compression;
995
996         if (bsdtar->verbose)
997                 fprintf(stderr, "\n");
998         comp = archive_position_compressed(a);
999         uncomp = archive_position_uncompressed(a);
1000         fprintf(stderr, "In: %d files, %s bytes;",
1001             archive_file_count(a), tar_i64toa(uncomp));
1002         if (comp > uncomp)
1003                 compression = 0;
1004         else
1005                 compression = (int)((uncomp - comp) * 100 / uncomp);
1006         fprintf(stderr,
1007             " Out: %s bytes, compression %d%%\n",
1008             tar_i64toa(comp), compression);
1009         /* Can't have two calls to tar_i64toa() pending, so split the output. */
1010         safe_fprintf(stderr, "Current: %s (%s",
1011             archive_entry_pathname(entry),
1012             tar_i64toa(progress));
1013         fprintf(stderr, "/%s bytes)\n",
1014             tar_i64toa(archive_entry_size(entry)));
1015 }
1016
1017
1018 /* Helper function to copy file to archive. */
1019 static int
1020 write_file_data(struct bsdtar *bsdtar, struct archive *a,
1021     struct archive_entry *entry, int fd)
1022 {
1023         ssize_t bytes_read;
1024         ssize_t bytes_written;
1025         int64_t progress = 0;
1026
1027         bytes_read = read(fd, bsdtar->buff, FILEDATABUFLEN);
1028         while (bytes_read > 0) {
1029                 if (need_report())
1030                         report_write(bsdtar, a, entry, progress);
1031
1032                 bytes_written = archive_write_data(a, bsdtar->buff,
1033                     bytes_read);
1034                 if (bytes_written < 0) {
1035                         /* Write failed; this is bad */
1036                         lafe_warnc(0, "%s", archive_error_string(a));
1037                         return (-1);
1038                 }
1039                 if (bytes_written < bytes_read) {
1040                         /* Write was truncated; warn but continue. */
1041                         lafe_warnc(0,
1042                             "%s: Truncated write; file may have grown while being archived.",
1043                             archive_entry_pathname(entry));
1044                         return (0);
1045                 }
1046                 progress += bytes_written;
1047                 bytes_read = read(fd, bsdtar->buff, FILEDATABUFLEN);
1048         }
1049         if (bytes_read < 0) {
1050                 lafe_warnc(errno,
1051                              "%s: Read error",
1052                              archive_entry_pathname(entry));
1053                 bsdtar->return_value = 1;
1054         }
1055         return 0;
1056 }
1057
1058 /*
1059  * Test if the specified file is new enough to include in the archive.
1060  */
1061 static int
1062 new_enough(struct bsdtar *bsdtar, const char *path, const struct stat *st)
1063 {
1064         struct archive_dir_entry *p;
1065
1066         /*
1067          * If this file/dir is excluded by a time comparison, skip it.
1068          */
1069         if (bsdtar->newer_ctime_sec > 0) {
1070                 if (st->st_ctime < bsdtar->newer_ctime_sec)
1071                         return (0); /* Too old, skip it. */
1072                 if (st->st_ctime == bsdtar->newer_ctime_sec
1073                     && ARCHIVE_STAT_CTIME_NANOS(st)
1074                     <= bsdtar->newer_ctime_nsec)
1075                         return (0); /* Too old, skip it. */
1076         }
1077         if (bsdtar->newer_mtime_sec > 0) {
1078                 if (st->st_mtime < bsdtar->newer_mtime_sec)
1079                         return (0); /* Too old, skip it. */
1080                 if (st->st_mtime == bsdtar->newer_mtime_sec
1081                     && ARCHIVE_STAT_MTIME_NANOS(st)
1082                     <= bsdtar->newer_mtime_nsec)
1083                         return (0); /* Too old, skip it. */
1084         }
1085
1086         /*
1087          * In -u mode, we only write an entry if it's newer than
1088          * what was already in the archive.
1089          */
1090         if (bsdtar->archive_dir != NULL &&
1091             bsdtar->archive_dir->head != NULL) {
1092                 for (p = bsdtar->archive_dir->head; p != NULL; p = p->next) {
1093                         if (pathcmp(path, p->name)==0)
1094                                 return (p->mtime_sec < st->st_mtime ||
1095                                     (p->mtime_sec == st->st_mtime &&
1096                                         p->mtime_nsec
1097                                         < ARCHIVE_STAT_MTIME_NANOS(st)));
1098                 }
1099         }
1100
1101         /* If the file wasn't rejected, include it. */
1102         return (1);
1103 }
1104
1105 /*
1106  * Add an entry to the dir list for 'u' mode.
1107  *
1108  * XXX TODO: Make this fast.
1109  */
1110 static void
1111 add_dir_list(struct bsdtar *bsdtar, const char *path,
1112     time_t mtime_sec, int mtime_nsec)
1113 {
1114         struct archive_dir_entry        *p;
1115
1116         /*
1117          * Search entire list to see if this file has appeared before.
1118          * If it has, override the timestamp data.
1119          */
1120         p = bsdtar->archive_dir->head;
1121         while (p != NULL) {
1122                 if (strcmp(path, p->name)==0) {
1123                         p->mtime_sec = mtime_sec;
1124                         p->mtime_nsec = mtime_nsec;
1125                         return;
1126                 }
1127                 p = p->next;
1128         }
1129
1130         p = malloc(sizeof(*p));
1131         if (p == NULL)
1132                 lafe_errc(1, ENOMEM, "Can't read archive directory");
1133
1134         p->name = strdup(path);
1135         if (p->name == NULL)
1136                 lafe_errc(1, ENOMEM, "Can't read archive directory");
1137         p->mtime_sec = mtime_sec;
1138         p->mtime_nsec = mtime_nsec;
1139         p->next = NULL;
1140         if (bsdtar->archive_dir->tail == NULL) {
1141                 bsdtar->archive_dir->head = bsdtar->archive_dir->tail = p;
1142         } else {
1143                 bsdtar->archive_dir->tail->next = p;
1144                 bsdtar->archive_dir->tail = p;
1145         }
1146 }
1147
1148 static void
1149 test_for_append(struct bsdtar *bsdtar)
1150 {
1151         struct stat s;
1152
1153         if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL)
1154                 lafe_errc(1, 0, "no files or directories specified");
1155         if (bsdtar->filename == NULL)
1156                 lafe_errc(1, 0, "Cannot append to stdout.");
1157
1158         if (bsdtar->create_compression != 0)
1159                 lafe_errc(1, 0,
1160                     "Cannot append to %s with compression", bsdtar->filename);
1161
1162         if (stat(bsdtar->filename, &s) != 0)
1163                 return;
1164
1165         if (!S_ISREG(s.st_mode) && !S_ISBLK(s.st_mode))
1166                 lafe_errc(1, 0,
1167                     "Cannot append to %s: not a regular file.",
1168                     bsdtar->filename);
1169
1170 /* Is this an appropriate check here on Windows? */
1171 /*
1172         if (GetFileType(handle) != FILE_TYPE_DISK)
1173                 lafe_errc(1, 0, "Cannot append");
1174 */
1175
1176 }