summaryrefslogtreecommitdiff
path: root/archival/ar.c
blob: 46c10aad49a6b6f11ce1490e03f2623f8459e855 (plain)
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
/* vi: set sw=4 ts=4: */
/*
 * Mini ar implementation for busybox
 *
 * Copyright (C) 2000 by Glenn McGrath
 *
 * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 *
 * Archive creation support:
 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
 * Written by Alexander Shishkin.
 *
 * There is no single standard to adhere to so ar may not portable
 * between different systems
 * http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html
 */

//config:config AR
//config:	bool "ar (9.5 kb)"
//config:	default n  # needs to be improved to be able to replace binutils ar
//config:	help
//config:	ar is an archival utility program used to create, modify, and
//config:	extract contents from archives. In practice, it is used exclusively
//config:	for object module archives used by compilers.
//config:
//config:	Unless you have a specific application which requires ar, you should
//config:	probably say N here: most compilers come with their own ar utility.
//config:
//config:config FEATURE_AR_LONG_FILENAMES
//config:	bool "Support long filenames (not needed for debs)"
//config:	default y
//config:	depends on AR
//config:	help
//config:	By default the ar format can only store the first 15 characters
//config:	of the filename, this option removes that limitation.
//config:	It supports the GNU ar long filename method which moves multiple long
//config:	filenames into a the data section of a new ar entry.
//config:
//config:config FEATURE_AR_CREATE
//config:	bool "Support archive creation"
//config:	default y
//config:	depends on AR
//config:	help
//config:	This enables archive creation (-c and -r) with busybox ar.

//applet:IF_AR(APPLET(ar, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_AR) += ar.o

//usage:#define ar_trivial_usage
//usage:       "[-o] [-v] [-p] [-t] [-x] ARCHIVE FILES"
//usage:#define ar_full_usage "\n\n"
//usage:       "Extract or list FILES from an ar archive\n"
//usage:     "\n	-o	Preserve original dates"
//usage:     "\n	-p	Extract to stdout"
//usage:     "\n	-t	List"
//usage:     "\n	-x	Extract"
//usage:     "\n	-v	Verbose"

#include "libbb.h"
#include "bb_archive.h"
#include "ar.h"

#if ENABLE_FEATURE_AR_CREATE
/* filter out entries with same names as specified on the command line */
static char FAST_FUNC filter_replaceable(archive_handle_t *handle)
{
	if (find_list_entry(handle->accept, handle->file_header->name))
		return EXIT_FAILURE;

	return EXIT_SUCCESS;
}

static void output_ar_header(archive_handle_t *handle)
{
	/* GNU ar 2.19.51.0.14 creates malformed archives
	 * if input files are >10G. It also truncates files >4GB
	 * (uses "size mod 4G"). We abort in this case:
	 * We could add support for up to 10G files, but this is unlikely to be useful.
	 * Note that unpacking side limits all fields to "unsigned int" data type,
	 * and treats "all ones" as an error indicator. Thus max we allow here is UINT_MAX-1.
	 */
	enum {
		/* for 2nd field: mtime */
		MAX11CHARS = UINT_MAX > 0xffffffff ? (unsigned)99999999999 : UINT_MAX-1,
		/* for last field: filesize */
		MAX10CHARS = UINT_MAX > 0xffffffff ? (unsigned)9999999999 : UINT_MAX-1,
	};

	struct file_header_t *fh = handle->file_header;

	if (handle->offset & 1) {
		xwrite(handle->src_fd, "\n", 1);
		handle->offset++;
	}

	/* Careful! The widths should be exact. Fields must be separated */
	if (sizeof(off_t) > 4 && fh->size > (off_t)MAX10CHARS) {
		bb_error_msg_and_die("'%s' is bigger than ar can handle", fh->name);
	}
	fdprintf(handle->src_fd, "%-16.16s%-12lu%-6u%-6u%-8o%-10"OFF_FMT"u`\n",
			fh->name,
			(sizeof(time_t) > 4 && fh->mtime > MAX11CHARS) ? (long)0 : (long)fh->mtime,
			fh->uid > 99999 ? 0 : (int)fh->uid,
			fh->gid > 99999 ? 0 : (int)fh->gid,
			(int)fh->mode & 07777777,
			fh->size
	);

	handle->offset += AR_HEADER_LEN;
}

/*
 * when replacing files in an existing archive, copy from the
 * original archive those files that are to be left intact
 */
static void FAST_FUNC copy_data(archive_handle_t *handle)
{
	archive_handle_t *out_handle = handle->ar__out;
	struct file_header_t *fh = handle->file_header;

	out_handle->file_header = fh;
	output_ar_header(out_handle);

	bb_copyfd_exact_size(handle->src_fd, out_handle->src_fd, fh->size);
	out_handle->offset += fh->size;
}

static int write_ar_header(archive_handle_t *handle)
{
	char *fn;
	char fn_h[17]; /* 15 + "/" + NUL */
	struct stat st;
	int fd;

	fn = llist_pop(&handle->accept);
	if (!fn)
		return -1;

	xstat(fn, &st);

	handle->file_header->mtime = st.st_mtime;
	handle->file_header->uid = st.st_uid;
	handle->file_header->gid = st.st_gid;
	handle->file_header->mode = st.st_mode;
	handle->file_header->size = st.st_size;
	handle->file_header->name = fn_h;
//TODO: if ENABLE_FEATURE_AR_LONG_FILENAMES...
	sprintf(fn_h, "%.15s/", bb_basename(fn));

	output_ar_header(handle);

	fd = xopen(fn, O_RDONLY);
	bb_copyfd_exact_size(fd, handle->src_fd, st.st_size);
	close(fd);
	handle->offset += st.st_size;

	return 0;
}

static int write_ar_archive(archive_handle_t *handle)
{
	struct stat st;
	archive_handle_t *out_handle;

	xfstat(handle->src_fd, &st, handle->ar__name);

	/* if archive exists, create a new handle for output.
	 * we create it in place of the old one.
	 */
	if (st.st_size != 0) {
		out_handle = init_handle();
		xunlink(handle->ar__name);
		out_handle->src_fd = xopen(handle->ar__name, O_WRONLY | O_CREAT | O_TRUNC);
		out_handle->accept = handle->accept;
	} else {
		out_handle = handle;
	}

	handle->ar__out = out_handle;

	xwrite(out_handle->src_fd, AR_MAGIC "\n", AR_MAGIC_LEN + 1);
	out_handle->offset += AR_MAGIC_LEN + 1;

	/* skip to the end of the archive if we have to append stuff */
	if (st.st_size != 0) {
		handle->filter = filter_replaceable;
		handle->action_data = copy_data;
		unpack_ar_archive(handle);
	}

	while (write_ar_header(out_handle) == 0)
		continue;

	/* optional, since we exit right after we return */
	if (ENABLE_FEATURE_CLEAN_UP) {
		close(handle->src_fd);
		if (out_handle->src_fd != handle->src_fd)
			close(out_handle->src_fd);
	}

	return EXIT_SUCCESS;
}
#endif /* FEATURE_AR_CREATE */

static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
{
	const char *mode = bb_mode_string(file_header->mode);
	char *mtime;

	mtime = ctime(&file_header->mtime);
	mtime[16] = ' ';
	memmove(&mtime[17], &mtime[20], 4);
	mtime[21] = '\0';
	printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1],
			(int)file_header->uid, (int)file_header->gid,
			file_header->size,
			&mtime[4], file_header->name
	);
}

#define AR_OPT_VERBOSE          (1 << 0)
#define AR_OPT_PRESERVE_DATE    (1 << 1)
/* "ar r" implies create, but warns about it. c suppresses warning.
 * bbox accepts but ignores it: */
#define AR_OPT_CREATE           (1 << 2)

#define AR_CMD_PRINT            (1 << 3)
#define FIRST_CMD               AR_CMD_PRINT
#define AR_CMD_LIST             (1 << 4)
#define AR_CMD_EXTRACT          (1 << 5)
#define AR_CMD_INSERT           (1 << 6)

int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ar_main(int argc UNUSED_PARAM, char **argv)
{
	archive_handle_t *archive_handle;
	unsigned opt, t;

	archive_handle = init_handle();

	/* prepend '-' to the first argument if required */
	if (argv[1] && argv[1][0] != '-' && argv[1][0] != '\0')
		argv[1] = xasprintf("-%s", argv[1]);
	/* -1: at least one param is reqd */
	/* one of p,t,x[,r] is required */
	opt_complementary = "-1:p:t:x"IF_FEATURE_AR_CREATE(":r");
	opt = getopt32(argv, "voc""ptx"IF_FEATURE_AR_CREATE("r"));
	argv += optind;

	t = opt / FIRST_CMD;
	if (t & (t-1)) /* more than one of p,t,x[,r] are specified */
		bb_show_usage();

	if (opt & AR_CMD_PRINT) {
		archive_handle->action_data = data_extract_to_stdout;
	}
	if (opt & AR_CMD_LIST) {
		archive_handle->action_header = header_list;
	}
	if (opt & AR_CMD_EXTRACT) {
		archive_handle->action_data = data_extract_all;
	}
	if (opt & AR_OPT_PRESERVE_DATE) {
		archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
	}
	if (opt & AR_OPT_VERBOSE) {
		archive_handle->action_header = header_verbose_list_ar;
	}
#if ENABLE_FEATURE_AR_CREATE
	archive_handle->ar__name = *argv;
#endif
	archive_handle->src_fd = xopen(*argv++,
			(opt & AR_CMD_INSERT)
				? O_RDWR | O_CREAT
				: O_RDONLY
	);

	if (*argv)
		archive_handle->filter = filter_accept_list;
	while (*argv) {
		llist_add_to_end(&archive_handle->accept, *argv++);
	}

#if ENABLE_FEATURE_AR_CREATE
	if (opt & AR_CMD_INSERT)
		return write_ar_archive(archive_handle);
#endif

	unpack_ar_archive(archive_handle);

	return EXIT_SUCCESS;
}