busybox/archival/ar.c

/* 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 tarball for details.
 *
 * 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
 */

#include "libbb.h"
#include "unarchive.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 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;

	if (fstat(handle->src_fd, &st) == -1)
		bb_simple_perror_msg_and_die(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 */
	/* -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;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini ar implementation for busybox
4	*
5	* Copyright (C) 2000 by Glenn McGrath
6	*
7	* Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
8	*
9	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10	*
11	* Archive creation support:
12	* Copyright (C) 2010 Nokia Corporation. All rights reserved.
13	* Written by Alexander Shishkin.
14	*
15	* There is no single standard to adhere to so ar may not portable
16	* between different systems
17	* http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html
18	*/
19
20	#include "libbb.h"
21	#include "unarchive.h"
22	#include "ar.h"
23
24	#if ENABLE_FEATURE_AR_CREATE
25	/* filter out entries with same names as specified on the command line */
26	static char FAST_FUNC filter_replaceable(archive_handle_t *handle)
27	{
28	if (find_list_entry(handle->accept, handle->file_header->name))
29	return EXIT_FAILURE;
30
31	return EXIT_SUCCESS;
32	}
33
34	static void output_ar_header(archive_handle_t *handle)
35	{
36	/* GNU ar 2.19.51.0.14 creates malformed archives
37	* if input files are >10G. It also truncates files >4GB
38	* (uses "size mod 4G"). We abort in this case:
39	* We could add support for up to 10G files, but this is unlikely to be useful.
40	* Note that unpacking side limits all fields to "unsigned int" data type,
41	* and treats "all ones" as an error indicator. Thus max we allow here is UINT_MAX-1.
42	*/
43	enum {
44	/* for 2nd field: mtime */
45	MAX11CHARS = UINT_MAX > 0xffffffff ? (unsigned)99999999999 : UINT_MAX-1,
46	/* for last field: filesize */
47	MAX10CHARS = UINT_MAX > 0xffffffff ? (unsigned)9999999999 : UINT_MAX-1,
48	};
49
50	struct file_header_t *fh = handle->file_header;
51
52	if (handle->offset & 1) {
53	xwrite(handle->src_fd, "\n", 1);
54	handle->offset++;
55	}
56
57	/* Careful! The widths should be exact. Fields must be separated */
58	if (sizeof(off_t) > 4 && fh->size > (off_t)MAX10CHARS) {
59	bb_error_msg_and_die("'%s' is bigger than ar can handle", fh->name);
60	}
61	fdprintf(handle->src_fd, "%-16.16s%-12lu%-6u%-6u%-8o%-10"OFF_FMT"u`\n",
62	fh->name,
63	(sizeof(time_t) > 4 && fh->mtime > MAX11CHARS) ? (long)0 : (long)fh->mtime,
64	fh->uid > 99999 ? 0 : (int)fh->uid,
65	fh->gid > 99999 ? 0 : (int)fh->gid,
66	(int)fh->mode & 07777777,
67	fh->size
68	);
69
70	handle->offset += AR_HEADER_LEN;
71	}
72
73	/*
74	* when replacing files in an existing archive, copy from the the
75	* original archive those files that are to be left intact
76	*/
77	static void FAST_FUNC copy_data(archive_handle_t *handle)
78	{
79	archive_handle_t *out_handle = handle->ar__out;
80	struct file_header_t *fh = handle->file_header;
81
82	out_handle->file_header = fh;
83	output_ar_header(out_handle);
84
85	bb_copyfd_exact_size(handle->src_fd, out_handle->src_fd, fh->size);
86	out_handle->offset += fh->size;
87	}
88
89	static int write_ar_header(archive_handle_t *handle)
90	{
91	char *fn;
92	char fn_h[17]; /* 15 + "/" + NUL */
93	struct stat st;
94	int fd;
95
96	fn = llist_pop(&handle->accept);
97	if (!fn)
98	return -1;
99
100	xstat(fn, &st);
101
102	handle->file_header->mtime = st.st_mtime;
103	handle->file_header->uid = st.st_uid;
104	handle->file_header->gid = st.st_gid;
105	handle->file_header->mode = st.st_mode;
106	handle->file_header->size = st.st_size;
107	handle->file_header->name = fn_h;
108	//TODO: if ENABLE_FEATURE_AR_LONG_FILENAMES...
109	sprintf(fn_h, "%.15s/", bb_basename(fn));
110
111	output_ar_header(handle);
112
113	fd = xopen(fn, O_RDONLY);
114	bb_copyfd_exact_size(fd, handle->src_fd, st.st_size);
115	close(fd);
116	handle->offset += st.st_size;
117
118	return 0;
119	}
120
121	static int write_ar_archive(archive_handle_t *handle)
122	{
123	struct stat st;
124	archive_handle_t *out_handle;
125
126	if (fstat(handle->src_fd, &st) == -1)
127	bb_simple_perror_msg_and_die(handle->ar__name);
128
129	/* if archive exists, create a new handle for output.
130	* we create it in place of the old one.
131	*/
132	if (st.st_size != 0) {
133	out_handle = init_handle();
134	xunlink(handle->ar__name);
135	out_handle->src_fd = xopen(handle->ar__name, O_WRONLY \| O_CREAT \| O_TRUNC);
136	out_handle->accept = handle->accept;
137	} else {
138	out_handle = handle;
139	}
140
141	handle->ar__out = out_handle;
142
143	xwrite(out_handle->src_fd, AR_MAGIC "\n", AR_MAGIC_LEN + 1);
144	out_handle->offset += AR_MAGIC_LEN + 1;
145
146	/* skip to the end of the archive if we have to append stuff */
147	if (st.st_size != 0) {
148	handle->filter = filter_replaceable;
149	handle->action_data = copy_data;
150	unpack_ar_archive(handle);
151	}
152
153	while (write_ar_header(out_handle) == 0)
154	continue;
155
156	/* optional, since we exit right after we return */
157	if (ENABLE_FEATURE_CLEAN_UP) {
158	close(handle->src_fd);
159	if (out_handle->src_fd != handle->src_fd)
160	close(out_handle->src_fd);
161	}
162
163	return EXIT_SUCCESS;
164	}
165	#endif /* FEATURE_AR_CREATE */
166
167	static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
168	{
169	const char *mode = bb_mode_string(file_header->mode);
170	char *mtime;
171
172	mtime = ctime(&file_header->mtime);
173	mtime[16] = ' ';
174	memmove(&mtime[17], &mtime[20], 4);
175	mtime[21] = '\0';
176	printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1],
177	(int)file_header->uid, (int)file_header->gid,
178	file_header->size,
179	&mtime[4], file_header->name
180	);
181	}
182
183	#define AR_OPT_VERBOSE (1 << 0)
184	#define AR_OPT_PRESERVE_DATE (1 << 1)
185	/* "ar r" implies create, but warns about it. c suppresses warning.
186	* bbox accepts but ignores it: */
187	#define AR_OPT_CREATE (1 << 2)
188
189	#define AR_CMD_PRINT (1 << 3)
190	#define FIRST_CMD AR_CMD_PRINT
191	#define AR_CMD_LIST (1 << 4)
192	#define AR_CMD_EXTRACT (1 << 5)
193	#define AR_CMD_INSERT (1 << 6)
194
195	int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
196	int ar_main(int argc UNUSED_PARAM, char **argv)
197	{
198	archive_handle_t *archive_handle;
199	unsigned opt, t;
200
201	archive_handle = init_handle();
202
203	/* --: prepend '-' to the first argument if required */
204	/* -1: at least one param is reqd */
205	/* one of p,t,x[,r] is required */
206	opt_complementary = "--:-1:p:t:x"IF_FEATURE_AR_CREATE(":r");
207	opt = getopt32(argv, "voc""ptx"IF_FEATURE_AR_CREATE("r"));
208	argv += optind;
209
210	t = opt / FIRST_CMD;
211	if (t & (t-1)) /* more than one of p,t,x[,r] are specified */
212	bb_show_usage();
213
214	if (opt & AR_CMD_PRINT) {
215	archive_handle->action_data = data_extract_to_stdout;
216	}
217	if (opt & AR_CMD_LIST) {
218	archive_handle->action_header = header_list;
219	}
220	if (opt & AR_CMD_EXTRACT) {
221	archive_handle->action_data = data_extract_all;
222	}
223	if (opt & AR_OPT_PRESERVE_DATE) {
224	archive_handle->ah_flags \|= ARCHIVE_RESTORE_DATE;
225	}
226	if (opt & AR_OPT_VERBOSE) {
227	archive_handle->action_header = header_verbose_list_ar;
228	}
229	#if ENABLE_FEATURE_AR_CREATE
230	archive_handle->ar__name = *argv;
231	#endif
232	archive_handle->src_fd = xopen(*argv++,
233	(opt & AR_CMD_INSERT)
234	? O_RDWR \| O_CREAT
235	: O_RDONLY
236	);
237
238	if (*argv)
239	archive_handle->filter = filter_accept_list;
240	while (*argv) {
241	llist_add_to_end(&archive_handle->accept, *argv++);
242	}
243
244	#if ENABLE_FEATURE_AR_CREATE
245	if (opt & AR_CMD_INSERT)
246	return write_ar_archive(archive_handle);
247	#endif
248
249	unpack_ar_archive(archive_handle);
250
251	return EXIT_SUCCESS;
252	}