1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Mini unzip implementation for busybox
|
---|
4 | *
|
---|
5 | * Copyright (C) 2004 by Ed Clark
|
---|
6 | *
|
---|
7 | * Loosely based on original busybox unzip applet by Laurence Anderson.
|
---|
8 | * All options and features should work in this version.
|
---|
9 | *
|
---|
10 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
---|
11 | */
|
---|
12 |
|
---|
13 | /* For reference see
|
---|
14 | * http://www.pkware.com/company/standards/appnote/
|
---|
15 | * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
|
---|
16 | */
|
---|
17 |
|
---|
18 | /* TODO
|
---|
19 | * Endian issues
|
---|
20 | * Zip64 + other methods
|
---|
21 | * Improve handling of zip format, ie.
|
---|
22 | * - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
|
---|
23 | * - unix file permissions, etc.
|
---|
24 | * - central directory
|
---|
25 | */
|
---|
26 |
|
---|
27 | #include "libbb.h"
|
---|
28 | #include "unarchive.h"
|
---|
29 |
|
---|
30 | #define ZIP_FILEHEADER_MAGIC SWAP_LE32(0x04034b50)
|
---|
31 | #define ZIP_CDS_MAGIC SWAP_LE32(0x02014b50)
|
---|
32 | #define ZIP_CDS_END_MAGIC SWAP_LE32(0x06054b50)
|
---|
33 | #define ZIP_DD_MAGIC SWAP_LE32(0x08074b50)
|
---|
34 |
|
---|
35 | typedef union {
|
---|
36 | unsigned char raw[26];
|
---|
37 | struct {
|
---|
38 | unsigned short version; /* 0-1 */
|
---|
39 | unsigned short flags; /* 2-3 */
|
---|
40 | unsigned short method; /* 4-5 */
|
---|
41 | unsigned short modtime; /* 6-7 */
|
---|
42 | unsigned short moddate; /* 8-9 */
|
---|
43 | unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
|
---|
44 | unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
|
---|
45 | unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
|
---|
46 | unsigned short filename_len; /* 22-23 */
|
---|
47 | unsigned short extra_len; /* 24-25 */
|
---|
48 | } formatted ATTRIBUTE_PACKED;
|
---|
49 | } zip_header_t;
|
---|
50 |
|
---|
51 | static void unzip_skip(int fd, off_t skip)
|
---|
52 | {
|
---|
53 | if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
|
---|
54 | if (errno != ESPIPE)
|
---|
55 | bb_error_msg_and_die("seek failure");
|
---|
56 | bb_copyfd_exact_size(fd, -1, skip);
|
---|
57 | }
|
---|
58 | }
|
---|
59 |
|
---|
60 | static void unzip_create_leading_dirs(char *fn)
|
---|
61 | {
|
---|
62 | /* Create all leading directories */
|
---|
63 | char *name = xstrdup(fn);
|
---|
64 | if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
|
---|
65 | bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
|
---|
66 | }
|
---|
67 | free(name);
|
---|
68 | }
|
---|
69 |
|
---|
70 | static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
|
---|
71 | {
|
---|
72 | if (zip_header->formatted.method == 0) {
|
---|
73 | /* Method 0 - stored (not compressed) */
|
---|
74 | off_t size = zip_header->formatted.ucmpsize;
|
---|
75 | if (size)
|
---|
76 | bb_copyfd_exact_size(src_fd, dst_fd, size);
|
---|
77 | } else {
|
---|
78 | /* Method 8 - inflate */
|
---|
79 | inflate_unzip_result res;
|
---|
80 | /* err = */ inflate_unzip(&res, zip_header->formatted.cmpsize, src_fd, dst_fd);
|
---|
81 | // we should check for -1 error return
|
---|
82 | /* Validate decompression - crc */
|
---|
83 | if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
|
---|
84 | bb_error_msg("invalid compressed data--%s error", "crc");
|
---|
85 | return 1;
|
---|
86 | }
|
---|
87 | /* Validate decompression - size */
|
---|
88 | if (zip_header->formatted.ucmpsize != res.bytes_out) {
|
---|
89 | bb_error_msg("invalid compressed data--%s error", "length");
|
---|
90 | return 1;
|
---|
91 | }
|
---|
92 | }
|
---|
93 | return 0;
|
---|
94 | }
|
---|
95 |
|
---|
96 | int unzip_main(int argc, char **argv);
|
---|
97 | int unzip_main(int argc, char **argv)
|
---|
98 | {
|
---|
99 | zip_header_t zip_header;
|
---|
100 | enum {v_silent, v_normal, v_list} verbosity = v_normal;
|
---|
101 | enum {o_prompt, o_never, o_always} overwrite = o_prompt;
|
---|
102 | unsigned int total_size = 0;
|
---|
103 | unsigned int total_entries = 0;
|
---|
104 | int src_fd = -1, dst_fd = -1;
|
---|
105 | char *src_fn = NULL, *dst_fn = NULL;
|
---|
106 | llist_t *zaccept = NULL;
|
---|
107 | llist_t *zreject = NULL;
|
---|
108 | char *base_dir = NULL;
|
---|
109 | int failed, i, opt, opt_range = 0, list_header_done = 0;
|
---|
110 | char key_buf[512];
|
---|
111 | struct stat stat_buf;
|
---|
112 |
|
---|
113 | while ((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
|
---|
114 | switch (opt_range) {
|
---|
115 | case 0: /* Options */
|
---|
116 | switch (opt) {
|
---|
117 | case 'l': /* List */
|
---|
118 | verbosity = v_list;
|
---|
119 | break;
|
---|
120 |
|
---|
121 | case 'n': /* Never overwrite existing files */
|
---|
122 | overwrite = o_never;
|
---|
123 | break;
|
---|
124 |
|
---|
125 | case 'o': /* Always overwrite existing files */
|
---|
126 | overwrite = o_always;
|
---|
127 | break;
|
---|
128 |
|
---|
129 | case 'p': /* Extract files to stdout and fall through to set verbosity */
|
---|
130 | dst_fd = STDOUT_FILENO;
|
---|
131 |
|
---|
132 | case 'q': /* Be quiet */
|
---|
133 | verbosity = (verbosity == v_normal) ? v_silent : verbosity;
|
---|
134 | break;
|
---|
135 |
|
---|
136 | case 1 : /* The zip file */
|
---|
137 | src_fn = xmalloc(strlen(optarg)+4);
|
---|
138 | strcpy(src_fn, optarg);
|
---|
139 | opt_range++;
|
---|
140 | break;
|
---|
141 |
|
---|
142 | default:
|
---|
143 | bb_show_usage();
|
---|
144 |
|
---|
145 | }
|
---|
146 | break;
|
---|
147 |
|
---|
148 | case 1: /* Include files */
|
---|
149 | if (opt == 1) {
|
---|
150 | llist_add_to(&zaccept, optarg);
|
---|
151 |
|
---|
152 | } else if (opt == 'd') {
|
---|
153 | base_dir = optarg;
|
---|
154 | opt_range += 2;
|
---|
155 |
|
---|
156 | } else if (opt == 'x') {
|
---|
157 | opt_range++;
|
---|
158 |
|
---|
159 | } else {
|
---|
160 | bb_show_usage();
|
---|
161 | }
|
---|
162 | break;
|
---|
163 |
|
---|
164 | case 2 : /* Exclude files */
|
---|
165 | if (opt == 1) {
|
---|
166 | llist_add_to(&zreject, optarg);
|
---|
167 |
|
---|
168 | } else if (opt == 'd') { /* Extract to base directory */
|
---|
169 | base_dir = optarg;
|
---|
170 | opt_range++;
|
---|
171 |
|
---|
172 | } else {
|
---|
173 | bb_show_usage();
|
---|
174 | }
|
---|
175 | break;
|
---|
176 |
|
---|
177 | default:
|
---|
178 | bb_show_usage();
|
---|
179 | }
|
---|
180 | }
|
---|
181 |
|
---|
182 | if (src_fn == NULL) {
|
---|
183 | bb_show_usage();
|
---|
184 | }
|
---|
185 |
|
---|
186 | /* Open input file */
|
---|
187 | if (LONE_DASH(src_fn)) {
|
---|
188 | src_fd = STDIN_FILENO;
|
---|
189 | /* Cannot use prompt mode since zip data is arriving on STDIN */
|
---|
190 | overwrite = (overwrite == o_prompt) ? o_never : overwrite;
|
---|
191 | } else {
|
---|
192 | static const char *const extn[] = {"", ".zip", ".ZIP"};
|
---|
193 | int orig_src_fn_len = strlen(src_fn);
|
---|
194 | for (i = 0; (i < 3) && (src_fd == -1); i++) {
|
---|
195 | strcpy(src_fn + orig_src_fn_len, extn[i]);
|
---|
196 | src_fd = open(src_fn, O_RDONLY);
|
---|
197 | }
|
---|
198 | if (src_fd == -1) {
|
---|
199 | src_fn[orig_src_fn_len] = '\0';
|
---|
200 | bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
|
---|
201 | }
|
---|
202 | }
|
---|
203 |
|
---|
204 | /* Change dir if necessary */
|
---|
205 | if (base_dir)
|
---|
206 | xchdir(base_dir);
|
---|
207 |
|
---|
208 | if (verbosity != v_silent)
|
---|
209 | printf("Archive: %s\n", src_fn);
|
---|
210 |
|
---|
211 | failed = 0;
|
---|
212 |
|
---|
213 | while (1) {
|
---|
214 | unsigned int magic;
|
---|
215 |
|
---|
216 | /* Check magic number */
|
---|
217 | xread(src_fd, &magic, 4);
|
---|
218 | if (magic == ZIP_CDS_MAGIC) {
|
---|
219 | break;
|
---|
220 | } else if (magic != ZIP_FILEHEADER_MAGIC) {
|
---|
221 | bb_error_msg_and_die("invalid zip magic %08X", magic);
|
---|
222 | }
|
---|
223 |
|
---|
224 | /* Read the file header */
|
---|
225 | xread(src_fd, zip_header.raw, 26);
|
---|
226 | zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
|
---|
227 | zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
|
---|
228 | zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
|
---|
229 | zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
|
---|
230 | zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
|
---|
231 | zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
|
---|
232 | zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
|
---|
233 | zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
|
---|
234 | zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
|
---|
235 | zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
|
---|
236 | if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
|
---|
237 | bb_error_msg_and_die("unsupported compression method %d", zip_header.formatted.method);
|
---|
238 | }
|
---|
239 |
|
---|
240 | /* Read filename */
|
---|
241 | free(dst_fn);
|
---|
242 | dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
|
---|
243 | xread(src_fd, dst_fn, zip_header.formatted.filename_len);
|
---|
244 |
|
---|
245 | /* Skip extra header bytes */
|
---|
246 | unzip_skip(src_fd, zip_header.formatted.extra_len);
|
---|
247 |
|
---|
248 | if ((verbosity == v_list) && !list_header_done){
|
---|
249 | puts(" Length Date Time Name\n"
|
---|
250 | " -------- ---- ---- ----");
|
---|
251 | list_header_done = 1;
|
---|
252 | }
|
---|
253 |
|
---|
254 | /* Filter zip entries */
|
---|
255 | if (find_list_entry(zreject, dst_fn) ||
|
---|
256 | (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
|
---|
257 | i = 'n';
|
---|
258 |
|
---|
259 | } else { /* Extract entry */
|
---|
260 | total_size += zip_header.formatted.ucmpsize;
|
---|
261 |
|
---|
262 | if (verbosity == v_list) { /* List entry */
|
---|
263 | unsigned int dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
|
---|
264 | printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
|
---|
265 | zip_header.formatted.ucmpsize,
|
---|
266 | (dostime & 0x01e00000) >> 21,
|
---|
267 | (dostime & 0x001f0000) >> 16,
|
---|
268 | (((dostime & 0xfe000000) >> 25) + 1980) % 100,
|
---|
269 | (dostime & 0x0000f800) >> 11,
|
---|
270 | (dostime & 0x000007e0) >> 5,
|
---|
271 | dst_fn);
|
---|
272 | total_entries++;
|
---|
273 | i = 'n';
|
---|
274 | } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
|
---|
275 | i = -1;
|
---|
276 | } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
|
---|
277 | if (stat(dst_fn, &stat_buf) == -1) {
|
---|
278 | if (errno != ENOENT) {
|
---|
279 | bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
|
---|
280 | }
|
---|
281 | if (verbosity == v_normal) {
|
---|
282 | printf(" creating: %s\n", dst_fn);
|
---|
283 | }
|
---|
284 | unzip_create_leading_dirs(dst_fn);
|
---|
285 | if (bb_make_directory(dst_fn, 0777, 0)) {
|
---|
286 | bb_error_msg_and_die("exiting");
|
---|
287 | }
|
---|
288 | } else {
|
---|
289 | if (!S_ISDIR(stat_buf.st_mode)) {
|
---|
290 | bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
|
---|
291 | }
|
---|
292 | }
|
---|
293 | i = 'n';
|
---|
294 |
|
---|
295 | } else { /* Extract file */
|
---|
296 | _check_file:
|
---|
297 | if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
|
---|
298 | if (errno != ENOENT) {
|
---|
299 | bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
|
---|
300 | }
|
---|
301 | i = 'y';
|
---|
302 | } else { /* File already exists */
|
---|
303 | if (overwrite == o_never) {
|
---|
304 | i = 'n';
|
---|
305 | } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
|
---|
306 | if (overwrite == o_always) {
|
---|
307 | i = 'y';
|
---|
308 | } else {
|
---|
309 | printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
|
---|
310 | if (!fgets(key_buf, 512, stdin)) {
|
---|
311 | bb_perror_msg_and_die("cannot read input");
|
---|
312 | }
|
---|
313 | i = key_buf[0];
|
---|
314 | }
|
---|
315 | } else { /* File is not regular file */
|
---|
316 | bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
|
---|
317 | }
|
---|
318 | }
|
---|
319 | }
|
---|
320 | }
|
---|
321 |
|
---|
322 | switch (i) {
|
---|
323 | case 'A':
|
---|
324 | overwrite = o_always;
|
---|
325 | case 'y': /* Open file and fall into unzip */
|
---|
326 | unzip_create_leading_dirs(dst_fn);
|
---|
327 | dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
|
---|
328 | case -1: /* Unzip */
|
---|
329 | if (verbosity == v_normal) {
|
---|
330 | printf(" inflating: %s\n", dst_fn);
|
---|
331 | }
|
---|
332 | if (unzip_extract(&zip_header, src_fd, dst_fd)) {
|
---|
333 | failed = 1;
|
---|
334 | }
|
---|
335 | if (dst_fd != STDOUT_FILENO) {
|
---|
336 | /* closing STDOUT is potentially bad for future business */
|
---|
337 | close(dst_fd);
|
---|
338 | }
|
---|
339 | break;
|
---|
340 |
|
---|
341 | case 'N':
|
---|
342 | overwrite = o_never;
|
---|
343 | case 'n':
|
---|
344 | /* Skip entry data */
|
---|
345 | unzip_skip(src_fd, zip_header.formatted.cmpsize);
|
---|
346 | break;
|
---|
347 |
|
---|
348 | case 'r':
|
---|
349 | /* Prompt for new name */
|
---|
350 | printf("new name: ");
|
---|
351 | if (!fgets(key_buf, 512, stdin)) {
|
---|
352 | bb_perror_msg_and_die("cannot read input");
|
---|
353 | }
|
---|
354 | free(dst_fn);
|
---|
355 | dst_fn = xstrdup(key_buf);
|
---|
356 | chomp(dst_fn);
|
---|
357 | goto _check_file;
|
---|
358 |
|
---|
359 | default:
|
---|
360 | printf("error: invalid response [%c]\n",(char)i);
|
---|
361 | goto _check_file;
|
---|
362 | }
|
---|
363 |
|
---|
364 | /* Data descriptor section */
|
---|
365 | if (zip_header.formatted.flags & 4) {
|
---|
366 | /* skip over duplicate crc, compressed size and uncompressed size */
|
---|
367 | unzip_skip(src_fd, 12);
|
---|
368 | }
|
---|
369 | }
|
---|
370 |
|
---|
371 | if (verbosity == v_list) {
|
---|
372 | printf(" -------- -------\n"
|
---|
373 | "%9d %d files\n", total_size, total_entries);
|
---|
374 | }
|
---|
375 |
|
---|
376 | return failed;
|
---|
377 | }
|
---|