aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libarchive/libarchive/archive_write_set_format_cpio_newc.c
blob: 9075616f9d71e6b30a14418bcf8e37ae0a86bee9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
/*-
 * Copyright (c) 2003-2007 Tim Kientzle
 * Copyright (c) 2006 Rudolf Marek SYSGO s.r.o.
 * Copyright (c) 2011-2012 Michihiro NAKAJIMA
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "archive_platform.h"
__FBSDID("$FreeBSD$");

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif

#include "archive.h"
#include "archive_entry.h"
#include "archive_entry_locale.h"
#include "archive_private.h"
#include "archive_write_private.h"
#include "archive_write_set_format_private.h"

static ssize_t	archive_write_newc_data(struct archive_write *,
		    const void *buff, size_t s);
static int	archive_write_newc_close(struct archive_write *);
static int	archive_write_newc_free(struct archive_write *);
static int	archive_write_newc_finish_entry(struct archive_write *);
static int	archive_write_newc_header(struct archive_write *,
		    struct archive_entry *);
static int      archive_write_newc_options(struct archive_write *,
		    const char *, const char *);
static int	format_hex(int64_t, void *, int);
static int64_t	format_hex_recursive(int64_t, char *, int);
static int	write_header(struct archive_write *, struct archive_entry *);

struct cpio {
	uint64_t	  entry_bytes_remaining;
	int		  padding;

	struct archive_string_conv *opt_sconv;
	struct archive_string_conv *sconv_default;
	int		  init_default_conversion;
};

#define	c_magic_offset 0
#define	c_magic_size 6
#define	c_ino_offset 6
#define	c_ino_size 8
#define	c_mode_offset 14
#define	c_mode_size 8
#define	c_uid_offset 22
#define	c_uid_size 8
#define	c_gid_offset 30
#define	c_gid_size 8
#define	c_nlink_offset 38
#define	c_nlink_size 8
#define	c_mtime_offset 46
#define	c_mtime_size 8
#define	c_filesize_offset 54
#define	c_filesize_size 8
#define	c_devmajor_offset 62
#define	c_devmajor_size 8
#define	c_devminor_offset 70
#define	c_devminor_size 8
#define	c_rdevmajor_offset 78
#define	c_rdevmajor_size 8
#define	c_rdevminor_offset 86
#define	c_rdevminor_size 8
#define	c_namesize_offset 94
#define	c_namesize_size 8
#define	c_checksum_offset 102
#define	c_checksum_size 8
#define	c_header_size 110

/* Logic trick: difference between 'n' and next multiple of 4 */
#define PAD4(n)	(3 & (1 + ~(n)))

/*
 * Set output format to 'cpio' format.
 */
int
archive_write_set_format_cpio_newc(struct archive *_a)
{
	struct archive_write *a = (struct archive_write *)_a;
	struct cpio *cpio;

	archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
	    ARCHIVE_STATE_NEW, "archive_write_set_format_cpio_newc");

	/* If someone else was already registered, unregister them. */
	if (a->format_free != NULL)
		(a->format_free)(a);

	cpio = (struct cpio *)calloc(1, sizeof(*cpio));
	if (cpio == NULL) {
		archive_set_error(&a->archive, ENOMEM, "Can't allocate cpio data");
		return (ARCHIVE_FATAL);
	}
	a->format_data = cpio;
	a->format_name = "cpio";
	a->format_options = archive_write_newc_options;
	a->format_write_header = archive_write_newc_header;
	a->format_write_data = archive_write_newc_data;
	a->format_finish_entry = archive_write_newc_finish_entry;
	a->format_close = archive_write_newc_close;
	a->format_free = archive_write_newc_free;
	a->archive.archive_format = ARCHIVE_FORMAT_CPIO_SVR4_NOCRC;
	a->archive.archive_format_name = "SVR4 cpio nocrc";
	return (ARCHIVE_OK);
}

static int
archive_write_newc_options(struct archive_write *a, const char *key,
    const char *val)
{
	struct cpio *cpio = (struct cpio *)a->format_data;
	int ret = ARCHIVE_FAILED;

	if (strcmp(key, "hdrcharset")  == 0) {
		if (val == NULL || val[0] == 0)
			archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
			    "%s: hdrcharset option needs a character-set name",
			    a->format_name);
		else {
			cpio->opt_sconv = archive_string_conversion_to_charset(
			    &a->archive, val, 0);
			if (cpio->opt_sconv != NULL)
				ret = ARCHIVE_OK;
			else
				ret = ARCHIVE_FATAL;
		}
		return (ret);
	}

	/* Note: The "warn" return is just to inform the options
	 * supervisor that we didn't handle it.  It will generate
	 * a suitable error if no one used this option. */
	return (ARCHIVE_WARN);
}

static struct archive_string_conv *
get_sconv(struct archive_write *a)
{
	struct cpio *cpio;
	struct archive_string_conv *sconv;

	cpio = (struct cpio *)a->format_data;
	sconv = cpio->opt_sconv;
	if (sconv == NULL) {
		if (!cpio->init_default_conversion) {
			cpio->sconv_default =
			    archive_string_default_conversion_for_write(
			      &(a->archive));
			cpio->init_default_conversion = 1;
		}
		sconv = cpio->sconv_default;
	}
	return (sconv);
}

static int
archive_write_newc_header(struct archive_write *a, struct archive_entry *entry)
{
	const char *path;
	size_t len;

	if (archive_entry_filetype(entry) == 0 && archive_entry_hardlink(entry) == NULL) {
		archive_set_error(&a->archive, -1, "Filetype required");
		return (ARCHIVE_FAILED);
	}

	if (archive_entry_pathname_l(entry, &path, &len, get_sconv(a)) != 0
	    && errno == ENOMEM) {
		archive_set_error(&a->archive, ENOMEM,
		    "Can't allocate memory for Pathname");
		return (ARCHIVE_FATAL);
	}
	if (len == 0 || path == NULL || path[0] == '\0') {
		archive_set_error(&a->archive, -1, "Pathname required");
		return (ARCHIVE_FAILED);
	}

	if (archive_entry_hardlink(entry) == NULL
	    && (!archive_entry_size_is_set(entry) || archive_entry_size(entry) < 0)) {
		archive_set_error(&a->archive, -1, "Size required");
		return (ARCHIVE_FAILED);
	}
	return write_header(a, entry);
}

static int
write_header(struct archive_write *a, struct archive_entry *entry)
{
	int64_t ino;
	struct cpio *cpio;
	const char *p, *path;
	int pathlength, ret, ret_final;
	char h[c_header_size];
	struct archive_string_conv *sconv;
	struct archive_entry *entry_main;
	size_t len;
	int pad;

	cpio = (struct cpio *)a->format_data;
	ret_final = ARCHIVE_OK;
	sconv = get_sconv(a);

#if defined(_WIN32) && !defined(__CYGWIN__)
	/* Make sure the path separators in pathname, hardlink and symlink
	 * are all slash '/', not the Windows path separator '\'. */
	entry_main = __la_win_entry_in_posix_pathseparator(entry);
	if (entry_main == NULL) {
		archive_set_error(&a->archive, ENOMEM,
		    "Can't allocate ustar data");
		return(ARCHIVE_FATAL);
	}
	if (entry != entry_main)
		entry = entry_main;
	else
		entry_main = NULL;
#else
	entry_main = NULL;
#endif

	ret = archive_entry_pathname_l(entry, &path, &len, sconv);
	if (ret != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Pathname");
			ret_final = ARCHIVE_FATAL;
			goto exit_write_header;
		}
		archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate pathname '%s' to %s",
		    archive_entry_pathname(entry),
		    archive_string_conversion_charset_name(sconv));
		ret_final = ARCHIVE_WARN;
	}
	pathlength = (int)len + 1; /* Include trailing null. */

	memset(h, 0, c_header_size);
	format_hex(0x070701, h + c_magic_offset, c_magic_size);
	format_hex(archive_entry_devmajor(entry), h + c_devmajor_offset,
	    c_devmajor_size);
	format_hex(archive_entry_devminor(entry), h + c_devminor_offset,
	    c_devminor_size);

	ino = archive_entry_ino64(entry);
	if (ino > 0xffffffff) {
		archive_set_error(&a->archive, ERANGE,
		    "large inode number truncated");
		ret_final = ARCHIVE_WARN;
	}

	/* TODO: Set ret_final to ARCHIVE_WARN if any of these overflow. */
	format_hex(ino & 0xffffffff, h + c_ino_offset, c_ino_size);
	format_hex(archive_entry_mode(entry), h + c_mode_offset, c_mode_size);
	format_hex(archive_entry_uid(entry), h + c_uid_offset, c_uid_size);
	format_hex(archive_entry_gid(entry), h + c_gid_offset, c_gid_size);
	format_hex(archive_entry_nlink(entry), h + c_nlink_offset, c_nlink_size);
	if (archive_entry_filetype(entry) == AE_IFBLK
	    || archive_entry_filetype(entry) == AE_IFCHR) {
	    format_hex(archive_entry_rdevmajor(entry), h + c_rdevmajor_offset, c_rdevmajor_size);
	    format_hex(archive_entry_rdevminor(entry), h + c_rdevminor_offset, c_rdevminor_size);
	} else {
	    format_hex(0, h + c_rdevmajor_offset, c_rdevmajor_size);
	    format_hex(0, h + c_rdevminor_offset, c_rdevminor_size);
	}
	format_hex(archive_entry_mtime(entry), h + c_mtime_offset, c_mtime_size);
	format_hex(pathlength, h + c_namesize_offset, c_namesize_size);
	format_hex(0, h + c_checksum_offset, c_checksum_size);

	/* Non-regular files don't store bodies. */
	if (archive_entry_filetype(entry) != AE_IFREG)
		archive_entry_set_size(entry, 0);

	/* Symlinks get the link written as the body of the entry. */
	ret = archive_entry_symlink_l(entry, &p, &len, sconv);
	if (ret != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Likname");
			ret_final = ARCHIVE_FATAL;
			goto exit_write_header;
		}
		archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate linkname '%s' to %s",
		    archive_entry_symlink(entry),
		    archive_string_conversion_charset_name(sconv));
		ret_final = ARCHIVE_WARN;
	}
	if (len > 0 && p != NULL  &&  *p != '\0')
		ret = format_hex(strlen(p), h + c_filesize_offset,
		    c_filesize_size);
	else
		ret = format_hex(archive_entry_size(entry),
		    h + c_filesize_offset, c_filesize_size);
	if (ret) {
		archive_set_error(&a->archive, ERANGE,
		    "File is too large for this format.");
		ret_final = ARCHIVE_FAILED;
		goto exit_write_header;
	}

	ret = __archive_write_output(a, h, c_header_size);
	if (ret != ARCHIVE_OK) {
		ret_final = ARCHIVE_FATAL;
		goto exit_write_header;
	}

	/* Pad pathname to even length. */
	ret = __archive_write_output(a, path, pathlength);
	if (ret != ARCHIVE_OK) {
		ret_final = ARCHIVE_FATAL;
		goto exit_write_header;
	}
	pad = PAD4(pathlength + c_header_size);
	if (pad) {
		ret = __archive_write_output(a, "\0\0\0", pad);
		if (ret != ARCHIVE_OK) {
			ret_final = ARCHIVE_FATAL;
			goto exit_write_header;
		}
	}

	cpio->entry_bytes_remaining = archive_entry_size(entry);
	cpio->padding = (int)PAD4(cpio->entry_bytes_remaining);

	/* Write the symlink now. */
	if (p != NULL  &&  *p != '\0') {
		ret = __archive_write_output(a, p, strlen(p));
		if (ret != ARCHIVE_OK) {
			ret_final = ARCHIVE_FATAL;
			goto exit_write_header;
		}
		pad = PAD4(strlen(p));
		ret = __archive_write_output(a, "\0\0\0", pad);
		if (ret != ARCHIVE_OK) {
			ret_final = ARCHIVE_FATAL;
			goto exit_write_header;
		}
	}
exit_write_header:
	archive_entry_free(entry_main);
	return (ret_final);
}

static ssize_t
archive_write_newc_data(struct archive_write *a, const void *buff, size_t s)
{
	struct cpio *cpio;
	int ret;

	cpio = (struct cpio *)a->format_data;
	if (s > cpio->entry_bytes_remaining)
		s = (size_t)cpio->entry_bytes_remaining;

	ret = __archive_write_output(a, buff, s);
	cpio->entry_bytes_remaining -= s;
	if (ret >= 0)
		return (s);
	else
		return (ret);
}

/*
 * Format a number into the specified field.
 */
static int
format_hex(int64_t v, void *p, int digits)
{
	int64_t	max;
	int	ret;

	max = (((int64_t)1) << (digits * 4)) - 1;
	if (v >= 0  &&  v <= max) {
	    format_hex_recursive(v, (char *)p, digits);
	    ret = 0;
	} else {
	    format_hex_recursive(max, (char *)p, digits);
	    ret = -1;
	}
	return (ret);
}

static int64_t
format_hex_recursive(int64_t v, char *p, int s)
{
	if (s == 0)
		return (v);
	v = format_hex_recursive(v, p+1, s-1);
	*p = "0123456789abcdef"[v & 0xf];
	return (v >> 4);
}

static int
archive_write_newc_close(struct archive_write *a)
{
	int er;
	struct archive_entry *trailer;

	trailer = archive_entry_new();
	archive_entry_set_nlink(trailer, 1);
	archive_entry_set_size(trailer, 0);
	archive_entry_set_pathname(trailer, "TRAILER!!!");
	/* Bypass the required data checks. */
	er = write_header(a, trailer);
	archive_entry_free(trailer);
	return (er);
}

static int
archive_write_newc_free(struct archive_write *a)
{
	struct cpio *cpio;

	cpio = (struct cpio *)a->format_data;
	free(cpio);
	a->format_data = NULL;
	return (ARCHIVE_OK);
}

static int
archive_write_newc_finish_entry(struct archive_write *a)
{
	struct cpio *cpio;

	cpio = (struct cpio *)a->format_data;
	return (__archive_write_nulls(a,
		(size_t)cpio->entry_bytes_remaining + cpio->padding));
}