1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2003-2007 Tim Kientzle
5 * All rights reserved.
6 */
7
8 #include "bsdtar_platform.h"
9
10 #ifdef HAVE_SYS_TYPES_H
11 #include <sys/types.h>
12 #endif
13 #ifdef HAVE_SYS_PARAM_H
14 #include <sys/param.h>
15 #endif
16 #ifdef HAVE_SYS_STAT_H
17 #include <sys/stat.h>
18 #endif
19
20 #ifdef HAVE_ERRNO_H
21 #include <errno.h>
22 #endif
23
24 #ifdef HAVE_FCNTL_H
25 #include <fcntl.h>
26 #endif
27
28 #ifdef HAVE_GRP_H
29 #include <grp.h>
30 #endif
31
32 #ifdef HAVE_IO_H
33 #include <io.h>
34 #endif
35
36 #ifdef HAVE_LIMITS_H
37 #include <limits.h>
38 #endif
39 #ifdef HAVE_PWD_H
40 #include <pwd.h>
41 #endif
42 #ifdef HAVE_STDINT_H
43 #include <stdint.h>
44 #endif
45 #include <stdio.h>
46 #ifdef HAVE_STDLIB_H
47 #include <stdlib.h>
48 #endif
49 #ifdef HAVE_STRING_H
50 #include <string.h>
51 #endif
52 #ifdef HAVE_TIME_H
53 #include <time.h>
54 #endif
55 #ifdef HAVE_UNISTD_H
56 #include <unistd.h>
57 #endif
58
59 #include "bsdtar.h"
60 #include "lafe_err.h"
61
62 struct progress_data {
63 struct bsdtar *bsdtar;
64 struct archive *archive;
65 struct archive_entry *entry;
66 };
67
68 static void read_archive(struct bsdtar *bsdtar, char mode, struct archive *);
69 static int unmatched_inclusions_warn(struct archive *matching, const char *);
70
71
72 void
tar_mode_t(struct bsdtar * bsdtar)73 tar_mode_t(struct bsdtar *bsdtar)
74 {
75 read_archive(bsdtar, 't', NULL);
76 if (unmatched_inclusions_warn(bsdtar->matching,
77 "Not found in archive") != 0)
78 bsdtar->return_value = 1;
79 }
80
81 void
tar_mode_x(struct bsdtar * bsdtar)82 tar_mode_x(struct bsdtar *bsdtar)
83 {
84 struct archive *writer;
85
86 writer = archive_write_disk_new();
87 if (writer == NULL)
88 lafe_errc(1, ENOMEM, "Cannot allocate disk writer object");
89 if ((bsdtar->flags & OPTFLAG_NUMERIC_OWNER) == 0)
90 archive_write_disk_set_standard_lookup(writer);
91 archive_write_disk_set_options(writer, bsdtar->extract_flags);
92
93 read_archive(bsdtar, 'x', writer);
94
95 if (unmatched_inclusions_warn(bsdtar->matching,
96 "Not found in archive") != 0)
97 bsdtar->return_value = 1;
98 archive_write_free(writer);
99 }
100
101 static void
progress_func(void * cookie)102 progress_func(void *cookie)
103 {
104 struct progress_data *progress_data = (struct progress_data *)cookie;
105 struct bsdtar *bsdtar = progress_data->bsdtar;
106 struct archive *a = progress_data->archive;
107 struct archive_entry *entry = progress_data->entry;
108 uint64_t comp, uncomp;
109 int compression;
110
111 if (!need_report())
112 return;
113
114 if (bsdtar->verbose)
115 fprintf(stderr, "\n");
116 if (a != NULL) {
117 comp = archive_filter_bytes(a, -1);
118 uncomp = archive_filter_bytes(a, 0);
119 if (comp > uncomp)
120 compression = 0;
121 else
122 compression = (int)((uncomp - comp) * 100 / uncomp);
123 fprintf(stderr,
124 "In: %ju bytes, compression %d%%;",
125 (uintmax_t)comp, compression);
126 fprintf(stderr, " Out: %d files, %ju bytes\n",
127 archive_file_count(a), (uintmax_t)uncomp);
128 }
129 if (entry != NULL) {
130 safe_fprintf(stderr, "Current: %s",
131 archive_entry_pathname(entry));
132 fprintf(stderr, " (%jd bytes)\n",
133 (intmax_t)archive_entry_size(entry));
134 }
135 }
136
137 /*
138 * Handle 'x' and 't' modes.
139 */
140 static void
read_archive(struct bsdtar * bsdtar,char mode,struct archive * writer)141 read_archive(struct bsdtar *bsdtar, char mode, struct archive *writer)
142 {
143 struct progress_data progress_data;
144 FILE *out;
145 struct archive *a;
146 struct archive_entry *entry;
147 const char *reader_options;
148 int r;
149
150 while (*bsdtar->argv) {
151 if (archive_match_include_pattern(bsdtar->matching,
152 *bsdtar->argv) != ARCHIVE_OK)
153 lafe_errc(1, 0, "Error inclusion pattern: %s",
154 archive_error_string(bsdtar->matching));
155 bsdtar->argv++;
156 }
157
158 if (bsdtar->names_from_file != NULL)
159 if (archive_match_include_pattern_from_file(
160 bsdtar->matching, bsdtar->names_from_file,
161 (bsdtar->flags & OPTFLAG_NULL)) != ARCHIVE_OK)
162 lafe_errc(1, 0, "Error inclusion pattern: %s",
163 archive_error_string(bsdtar->matching));
164
165 a = archive_read_new();
166 if (cset_read_support_filter_program(bsdtar->cset, a) == 0)
167 archive_read_support_filter_all(a);
168 archive_read_support_format_all(a);
169
170 reader_options = getenv(ENV_READER_OPTIONS);
171 if (reader_options != NULL) {
172 size_t module_len = sizeof(IGNORE_WRONG_MODULE_NAME) - 1;
173 size_t opt_len = strlen(reader_options) + 1;
174 char *p;
175 /* Set default read options. */
176 if ((p = malloc(module_len + opt_len)) == NULL)
177 lafe_errc(1, errno, "Out of memory");
178 /* Prepend magic code to ignore options for
179 * a format or modules which are not added to
180 * the archive read object. */
181 memcpy(p, IGNORE_WRONG_MODULE_NAME, module_len);
182 memcpy(p + module_len, reader_options, opt_len);
183 r = archive_read_set_options(a, p);
184 free(p);
185 if (r == ARCHIVE_FATAL)
186 lafe_errc(1, 0, "%s", archive_error_string(a));
187 else
188 archive_clear_error(a);
189 }
190 if (ARCHIVE_OK != archive_read_set_options(a, bsdtar->option_options))
191 lafe_errc(1, 0, "%s", archive_error_string(a));
192 if (bsdtar->flags & OPTFLAG_IGNORE_ZEROS)
193 if (archive_read_set_options(a,
194 "read_concatenated_archives") != ARCHIVE_OK)
195 lafe_errc(1, 0, "%s", archive_error_string(a));
196 if (bsdtar->passphrase != NULL)
197 r = archive_read_add_passphrase(a, bsdtar->passphrase);
198 else
199 r = archive_read_set_passphrase_callback(a, bsdtar,
200 &passphrase_callback);
201 if (r != ARCHIVE_OK)
202 lafe_errc(1, 0, "%s", archive_error_string(a));
203 if (archive_read_open_filename(a, bsdtar->filename,
204 bsdtar->bytes_per_block))
205 lafe_errc(1, 0, "Error opening archive: %s",
206 archive_error_string(a));
207
208 do_chdir(bsdtar);
209
210 if (mode == 'x') {
211 /* Set an extract callback so that we can handle SIGINFO. */
212 progress_data.bsdtar = bsdtar;
213 progress_data.archive = a;
214 archive_read_extract_set_progress_callback(a, progress_func,
215 &progress_data);
216 }
217
218 if (mode == 'x' && (bsdtar->flags & OPTFLAG_CHROOT)) {
219 #if HAVE_CHROOT
220 if (chroot(".") != 0)
221 lafe_errc(1, errno, "Can't chroot to \".\"");
222 #else
223 lafe_errc(1, 0,
224 "chroot isn't supported on this platform");
225 #endif
226 }
227
228 #if defined(_WIN32) && !defined(__CYGWIN__)
229 if (mode == 'x' && (bsdtar->flags & OPTFLAG_STDOUT)) {
230 _setmode(1, _O_BINARY);
231 }
232 #endif
233
234 for (;;) {
235 /* Support --fast-read option */
236 const char *p;
237
238 if (bsdtar->flags & OPTFLAG_FAST_READ) {
239 r = archive_match_path_unmatched_inclusions(bsdtar->matching);
240 if (r < 0)
241 lafe_errc(1, 0, "%s", archive_error_string(a));
242 if (!r)
243 break;
244 }
245
246 r = archive_read_next_header(a, &entry);
247 progress_data.entry = entry;
248 if (r == ARCHIVE_EOF)
249 break;
250 if (r < ARCHIVE_OK)
251 lafe_warnc(0, "%s", archive_error_string(a));
252 if (r <= ARCHIVE_WARN)
253 bsdtar->return_value = 1;
254 if (r == ARCHIVE_RETRY) {
255 /* Retryable error: try again */
256 lafe_warnc(0, "Retrying...");
257 continue;
258 }
259 if (r == ARCHIVE_FATAL)
260 break;
261 p = archive_entry_pathname(entry);
262 if (p == NULL || p[0] == '\0') {
263 lafe_warnc(0, "Archive entry has empty or unreadable filename ... skipping");
264 bsdtar->return_value = 1;
265 continue;
266 }
267
268 if (bsdtar->uid >= 0) {
269 archive_entry_set_uid(entry, bsdtar->uid);
270 archive_entry_set_uname(entry, NULL);
271 }
272 if (bsdtar->gid >= 0) {
273 archive_entry_set_gid(entry, bsdtar->gid);
274 archive_entry_set_gname(entry, NULL);
275 }
276 if (bsdtar->uname)
277 archive_entry_set_uname(entry, bsdtar->uname);
278 if (bsdtar->gname)
279 archive_entry_set_gname(entry, bsdtar->gname);
280
281 /*
282 * Note that pattern exclusions are checked before
283 * pathname rewrites are handled. This gives more
284 * control over exclusions, since rewrites always lose
285 * information. (For example, consider a rewrite
286 * s/foo[0-9]/foo/. If we check exclusions after the
287 * rewrite, there would be no way to exclude foo1/bar
288 * while allowing foo2/bar.)
289 */
290 r = archive_match_excluded(bsdtar->matching, entry);
291 if (r == ARCHIVE_FATAL)
292 lafe_errc(1, 0, "%s",
293 archive_error_string(bsdtar->matching));
294 if (r)
295 continue; /* Excluded by a pattern test. */
296
297 if (mode == 't') {
298 /* Perversely, gtar uses -O to mean "send to stderr"
299 * when used with -t. */
300 out = (bsdtar->flags & OPTFLAG_STDOUT) ?
301 stderr : stdout;
302
303 /*
304 * TODO: Provide some reasonable way to
305 * preview rewrites. gtar always displays
306 * the unedited path in -t output, which means
307 * you cannot easily preview rewrites.
308 */
309 if (bsdtar->verbose < 2)
310 safe_fprintf(out, "%s",
311 archive_entry_pathname(entry));
312 else
313 list_item_verbose(bsdtar, out, entry);
314 fflush(out);
315 r = archive_read_data_skip(a);
316 if (r == ARCHIVE_WARN) {
317 fprintf(out, "\n");
318 lafe_warnc(0, "%s",
319 archive_error_string(a));
320 }
321 if (r == ARCHIVE_RETRY) {
322 fprintf(out, "\n");
323 lafe_warnc(0, "%s",
324 archive_error_string(a));
325 }
326 if (r == ARCHIVE_FATAL) {
327 fprintf(out, "\n");
328 lafe_warnc(0, "%s",
329 archive_error_string(a));
330 bsdtar->return_value = 1;
331 break;
332 }
333 fprintf(out, "\n");
334 } else {
335 /* Note: some rewrite failures prevent extraction. */
336 if (edit_pathname(bsdtar, entry))
337 continue; /* Excluded by a rewrite failure. */
338
339 if ((bsdtar->flags & OPTFLAG_INTERACTIVE) &&
340 !yes("extract '%s'", archive_entry_pathname(entry)))
341 continue;
342
343 if (bsdtar->verbose > 1) {
344 /* GNU tar uses -tv format with -xvv */
345 safe_fprintf(stderr, "x ");
346 list_item_verbose(bsdtar, stderr, entry);
347 fflush(stderr);
348 } else if (bsdtar->verbose > 0) {
349 /* Format follows SUSv2, including the
350 * deferred '\n'. */
351 safe_fprintf(stderr, "x %s",
352 archive_entry_pathname(entry));
353 fflush(stderr);
354 }
355
356 /* TODO siginfo_printinfo(bsdtar, 0); */
357
358 if (bsdtar->flags & OPTFLAG_STDOUT)
359 r = archive_read_data_into_fd(a, 1);
360 else
361 r = archive_read_extract2(a, entry, writer);
362 if (r != ARCHIVE_OK) {
363 if (!bsdtar->verbose)
364 safe_fprintf(stderr, "%s", archive_entry_pathname(entry));
365 safe_fprintf(stderr, ": %s: %s",
366 archive_error_string(a),
367 strerror(archive_errno(a)));
368 if (!bsdtar->verbose)
369 fprintf(stderr, "\n");
370 bsdtar->return_value = 1;
371 }
372 if (bsdtar->verbose)
373 fprintf(stderr, "\n");
374 if (r == ARCHIVE_FATAL)
375 break;
376 }
377 }
378
379
380 r = archive_read_close(a);
381 if (r != ARCHIVE_OK)
382 lafe_warnc(0, "%s", archive_error_string(a));
383 if (r <= ARCHIVE_WARN)
384 bsdtar->return_value = 1;
385
386 if (bsdtar->verbose > 2)
387 fprintf(stdout, "Archive Format: %s, Compression: %s\n",
388 archive_format_name(a), archive_filter_name(a, 0));
389
390 archive_read_free(a);
391 }
392
393
394 static int
unmatched_inclusions_warn(struct archive * matching,const char * msg)395 unmatched_inclusions_warn(struct archive *matching, const char *msg)
396 {
397 const char *p;
398 int r;
399
400 if (matching == NULL)
401 return (0);
402
403 while ((r = archive_match_path_unmatched_inclusions_next(
404 matching, &p)) == ARCHIVE_OK)
405 lafe_warnc(0, "%s: %s", p, msg);
406 if (r == ARCHIVE_FATAL)
407 lafe_errc(1, 0, "%s", archive_error_string(matching));
408
409 return (archive_match_path_unmatched_inclusions(matching));
410 }
411