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 GPLv2 or later, see file LICENSE in this source tree.
11 */
12 /* For reference see
13 * http://www.pkware.com/company/standards/appnote/
14 * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
15 *
16 * TODO
17 * Zip64 + other methods
18 */
19
20 //config:config UNZIP
21 //config: bool "unzip"
22 //config: default y
23 //config: help
24 //config: unzip will list or extract files from a ZIP archive,
25 //config: commonly found on DOS/WIN systems. The default behavior
26 //config: (with no options) is to extract the archive into the
27 //config: current directory. Use the `-d' option to extract to a
28 //config: directory of your choice.
29
30 //applet:IF_UNZIP(APPLET(unzip, BB_DIR_USR_BIN, BB_SUID_DROP))
31 //kbuild:lib-$(CONFIG_UNZIP) += unzip.o
32
33 //usage:#define unzip_trivial_usage
34 //usage: "[-lnopq] FILE[.zip] [FILE]... [-x FILE...] [-d DIR]"
35 //usage:#define unzip_full_usage "\n\n"
36 //usage: "Extract FILEs from ZIP archive\n"
37 //usage: "\n -l List contents (with -q for short form)"
38 //usage: "\n -n Never overwrite files (default: ask)"
39 //usage: "\n -o Overwrite"
40 //usage: "\n -p Print to stdout"
41 //usage: "\n -q Quiet"
42 //usage: "\n -x FILE Exclude FILEs"
43 //usage: "\n -d DIR Extract into DIR"
44
45 #include "libbb.h"
46 #include "bb_archive.h"
47
48 #if 0
49 # define dbg(...) bb_error_msg(__VA_ARGS__)
50 #else
51 # define dbg(...) ((void)0)
52 #endif
53
54 enum {
55 #if BB_BIG_ENDIAN
56 ZIP_FILEHEADER_MAGIC = 0x504b0304,
57 ZIP_CDF_MAGIC = 0x504b0102, /* central directory's file header */
58 ZIP_CDE_MAGIC = 0x504b0506, /* "end of central directory" record */
59 ZIP_DD_MAGIC = 0x504b0708,
60 #else
61 ZIP_FILEHEADER_MAGIC = 0x04034b50,
62 ZIP_CDF_MAGIC = 0x02014b50,
63 ZIP_CDE_MAGIC = 0x06054b50,
64 ZIP_DD_MAGIC = 0x08074b50,
65 #endif
66 };
67
68 #define ZIP_HEADER_LEN 26
69
70 typedef union {
71 uint8_t raw[ZIP_HEADER_LEN];
72 struct {
73 uint16_t version; /* 0-1 */
74 uint16_t zip_flags; /* 2-3 */
75 uint16_t method; /* 4-5 */
76 uint16_t modtime; /* 6-7 */
77 uint16_t moddate; /* 8-9 */
78 uint32_t crc32 PACKED; /* 10-13 */
79 uint32_t cmpsize PACKED; /* 14-17 */
80 uint32_t ucmpsize PACKED; /* 18-21 */
81 uint16_t filename_len; /* 22-23 */
82 uint16_t extra_len; /* 24-25 */
83 } formatted PACKED;
84 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
85
86 /* Check the offset of the last element, not the length. This leniency
87 * allows for poor packing, whereby the overall struct may be too long,
88 * even though the elements are all in the right place.
89 */
90 struct BUG_zip_header_must_be_26_bytes {
91 char BUG_zip_header_must_be_26_bytes[
92 offsetof(zip_header_t, formatted.extra_len) + 2
93 == ZIP_HEADER_LEN ? 1 : -1];
94 };
95
96 #define FIX_ENDIANNESS_ZIP(zip_header) do { \
97 (zip_header).formatted.version = SWAP_LE16((zip_header).formatted.version ); \
98 (zip_header).formatted.method = SWAP_LE16((zip_header).formatted.method ); \
99 (zip_header).formatted.modtime = SWAP_LE16((zip_header).formatted.modtime ); \
100 (zip_header).formatted.moddate = SWAP_LE16((zip_header).formatted.moddate ); \
101 (zip_header).formatted.crc32 = SWAP_LE32((zip_header).formatted.crc32 ); \
102 (zip_header).formatted.cmpsize = SWAP_LE32((zip_header).formatted.cmpsize ); \
103 (zip_header).formatted.ucmpsize = SWAP_LE32((zip_header).formatted.ucmpsize ); \
104 (zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
105 (zip_header).formatted.extra_len = SWAP_LE16((zip_header).formatted.extra_len ); \
106 } while (0)
107
108 #define CDF_HEADER_LEN 42
109
110 typedef union {
111 uint8_t raw[CDF_HEADER_LEN];
112 struct {
113 /* uint32_t signature; 50 4b 01 02 */
114 uint16_t version_made_by; /* 0-1 */
115 uint16_t version_needed; /* 2-3 */
116 uint16_t cdf_flags; /* 4-5 */
117 uint16_t method; /* 6-7 */
118 uint16_t mtime; /* 8-9 */
119 uint16_t mdate; /* 10-11 */
120 uint32_t crc32; /* 12-15 */
121 uint32_t cmpsize; /* 16-19 */
122 uint32_t ucmpsize; /* 20-23 */
123 uint16_t file_name_length; /* 24-25 */
124 uint16_t extra_field_length; /* 26-27 */
125 uint16_t file_comment_length; /* 28-29 */
126 uint16_t disk_number_start; /* 30-31 */
127 uint16_t internal_file_attributes; /* 32-33 */
128 uint32_t external_file_attributes PACKED; /* 34-37 */
129 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
130 } formatted PACKED;
131 } cdf_header_t;
132
133 struct BUG_cdf_header_must_be_42_bytes {
134 char BUG_cdf_header_must_be_42_bytes[
135 offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
136 == CDF_HEADER_LEN ? 1 : -1];
137 };
138
139 #define FIX_ENDIANNESS_CDF(cdf_header) do { \
140 (cdf_header).formatted.crc32 = SWAP_LE32((cdf_header).formatted.crc32 ); \
141 (cdf_header).formatted.cmpsize = SWAP_LE32((cdf_header).formatted.cmpsize ); \
142 (cdf_header).formatted.ucmpsize = SWAP_LE32((cdf_header).formatted.ucmpsize ); \
143 (cdf_header).formatted.file_name_length = SWAP_LE16((cdf_header).formatted.file_name_length); \
144 (cdf_header).formatted.extra_field_length = SWAP_LE16((cdf_header).formatted.extra_field_length); \
145 (cdf_header).formatted.file_comment_length = SWAP_LE16((cdf_header).formatted.file_comment_length); \
146 IF_DESKTOP( \
147 (cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
148 (cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
149 ) \
150 } while (0)
151
152 #define CDE_HEADER_LEN 16
153
154 typedef union {
155 uint8_t raw[CDE_HEADER_LEN];
156 struct {
157 /* uint32_t signature; 50 4b 05 06 */
158 uint16_t this_disk_no;
159 uint16_t disk_with_cdf_no;
160 uint16_t cdf_entries_on_this_disk;
161 uint16_t cdf_entries_total;
162 uint32_t cdf_size;
163 uint32_t cdf_offset;
164 /* uint16_t file_comment_length; */
165 /* .ZIP file comment (variable size) */
166 } formatted PACKED;
167 } cde_header_t;
168
169 struct BUG_cde_header_must_be_16_bytes {
170 char BUG_cde_header_must_be_16_bytes[
171 sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
172 };
173
174 #define FIX_ENDIANNESS_CDE(cde_header) do { \
175 (cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
176 } while (0)
177
178 enum { zip_fd = 3 };
179
180
181 #if ENABLE_DESKTOP
182
183 /* Seen in the wild:
184 * Self-extracting PRO2K3XP_32.exe contains 19078464 byte zip archive,
185 * where CDE was nearly 48 kbytes before EOF.
186 * (Surprisingly, it also apparently has *another* CDE structure
187 * closer to the end, with bogus cdf_offset).
188 * To make extraction work, bumped PEEK_FROM_END from 16k to 64k.
189 */
190 #define PEEK_FROM_END (64*1024)
191
192 /* This value means that we failed to find CDF */
193 #define BAD_CDF_OFFSET ((uint32_t)0xffffffff)
194
195 /* NB: does not preserve file position! */
find_cdf_offset(void)196 static uint32_t find_cdf_offset(void)
197 {
198 cde_header_t cde_header;
199 unsigned char *p;
200 off_t end;
201 unsigned char *buf = xzalloc(PEEK_FROM_END);
202 uint32_t found;
203
204 end = xlseek(zip_fd, 0, SEEK_END);
205 end -= PEEK_FROM_END;
206 if (end < 0)
207 end = 0;
208 dbg("Looking for cdf_offset starting from 0x%"OFF_FMT"x", end);
209 xlseek(zip_fd, end, SEEK_SET);
210 full_read(zip_fd, buf, PEEK_FROM_END);
211
212 found = BAD_CDF_OFFSET;
213 p = buf;
214 while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
215 if (*p != 'P') {
216 p++;
217 continue;
218 }
219 if (*++p != 'K')
220 continue;
221 if (*++p != 5)
222 continue;
223 if (*++p != 6)
224 continue;
225 /* we found CDE! */
226 memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
227 FIX_ENDIANNESS_CDE(cde_header);
228 /*
229 * I've seen .ZIP files with seemingly valid CDEs
230 * where cdf_offset points past EOF - ??
231 * This check ignores such CDEs:
232 */
233 if (cde_header.formatted.cdf_offset < end + (p - buf)) {
234 found = cde_header.formatted.cdf_offset;
235 dbg("Possible cdf_offset:0x%x at 0x%"OFF_FMT"x",
236 (unsigned)found, end + (p-3 - buf));
237 dbg(" cdf_offset+cdf_size:0x%x",
238 (unsigned)(found + SWAP_LE32(cde_header.formatted.cdf_size)));
239 /*
240 * We do not "break" here because only the last CDE is valid.
241 * I've seen a .zip archive which contained a .zip file,
242 * uncompressed, and taking the first CDE was using
243 * the CDE inside that file!
244 */
245 }
246 }
247 free(buf);
248 dbg("Found cdf_offset:0x%x", (unsigned)found);
249 return found;
250 };
251
read_next_cdf(uint32_t cdf_offset,cdf_header_t * cdf_ptr)252 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
253 {
254 off_t org;
255
256 org = xlseek(zip_fd, 0, SEEK_CUR);
257
258 if (!cdf_offset)
259 cdf_offset = find_cdf_offset();
260
261 if (cdf_offset != BAD_CDF_OFFSET) {
262 dbg("Reading CDF at 0x%x", (unsigned)cdf_offset);
263 xlseek(zip_fd, cdf_offset + 4, SEEK_SET);
264 xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
265 FIX_ENDIANNESS_CDF(*cdf_ptr);
266 dbg(" file_name_length:%u extra_field_length:%u file_comment_length:%u",
267 (unsigned)cdf_ptr->formatted.file_name_length,
268 (unsigned)cdf_ptr->formatted.extra_field_length,
269 (unsigned)cdf_ptr->formatted.file_comment_length
270 );
271 cdf_offset += 4 + CDF_HEADER_LEN
272 + cdf_ptr->formatted.file_name_length
273 + cdf_ptr->formatted.extra_field_length
274 + cdf_ptr->formatted.file_comment_length;
275 }
276
277 dbg("Returning file position to 0x%"OFF_FMT"x", org);
278 xlseek(zip_fd, org, SEEK_SET);
279 return cdf_offset;
280 };
281 #endif
282
unzip_skip(off_t skip)283 static void unzip_skip(off_t skip)
284 {
285 if (skip != 0)
286 if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
287 bb_copyfd_exact_size(zip_fd, -1, skip);
288 }
289
unzip_create_leading_dirs(const char * fn)290 static void unzip_create_leading_dirs(const char *fn)
291 {
292 /* Create all leading directories */
293 char *name = xstrdup(fn);
294 if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
295 xfunc_die(); /* bb_make_directory is noisy */
296 }
297 free(name);
298 }
299
unzip_extract(zip_header_t * zip_header,int dst_fd)300 static void unzip_extract(zip_header_t *zip_header, int dst_fd)
301 {
302 if (zip_header->formatted.method == 0) {
303 /* Method 0 - stored (not compressed) */
304 off_t size = zip_header->formatted.ucmpsize;
305 if (size)
306 bb_copyfd_exact_size(zip_fd, dst_fd, size);
307 } else {
308 /* Method 8 - inflate */
309 transformer_state_t xstate;
310 init_transformer_state(&xstate);
311 xstate.bytes_in = zip_header->formatted.cmpsize;
312 xstate.src_fd = zip_fd;
313 xstate.dst_fd = dst_fd;
314 if (inflate_unzip(&xstate) < 0)
315 bb_error_msg_and_die("inflate error");
316 /* Validate decompression - crc */
317 if (zip_header->formatted.crc32 != (xstate.crc32 ^ 0xffffffffL)) {
318 bb_error_msg_and_die("crc error");
319 }
320 /* Validate decompression - size */
321 if (zip_header->formatted.ucmpsize != xstate.bytes_out) {
322 /* Don't die. Who knows, maybe len calculation
323 * was botched somewhere. After all, crc matched! */
324 bb_error_msg("bad length");
325 }
326 }
327 }
328
my_fgets80(char * buf80)329 static void my_fgets80(char *buf80)
330 {
331 fflush_all();
332 if (!fgets(buf80, 80, stdin)) {
333 bb_perror_msg_and_die("can't read standard input");
334 }
335 }
336
337 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
unzip_main(int argc,char ** argv)338 int unzip_main(int argc, char **argv)
339 {
340 enum { O_PROMPT, O_NEVER, O_ALWAYS };
341
342 zip_header_t zip_header;
343 smallint quiet = 0;
344 IF_NOT_DESKTOP(const) smallint verbose = 0;
345 smallint listing = 0;
346 smallint overwrite = O_PROMPT;
347 smallint x_opt_seen;
348 #if ENABLE_DESKTOP
349 uint32_t cdf_offset;
350 #endif
351 unsigned long total_usize;
352 unsigned long total_size;
353 unsigned total_entries;
354 int dst_fd = -1;
355 char *src_fn = NULL;
356 char *dst_fn = NULL;
357 llist_t *zaccept = NULL;
358 llist_t *zreject = NULL;
359 char *base_dir = NULL;
360 int i, opt;
361 char key_buf[80]; /* must match size used by my_fgets80 */
362 struct stat stat_buf;
363
364 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
365 *
366 * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
367 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
368 * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
369 * Length Method Size Ratio Date Time CRC-32 Name
370 * -------- ------ ------- ----- ---- ---- ------ ----
371 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
372 * -------- ------- --- -------
373 * 204372 35278 83% 1 file
374 * # /usr/bin/unzip -v decompress_unlzma.i.zip
375 * Archive: decompress_unlzma.i.zip
376 * Length Method Size Ratio Date Time CRC-32 Name
377 * -------- ------ ------- ----- ---- ---- ------ ----
378 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
379 * -------- ------- --- -------
380 * 204372 35278 83% 1 file
381 * # unzip -v decompress_unlzma.i.zip
382 * Archive: decompress_unlzma.i.zip
383 * Length Date Time Name
384 * -------- ---- ---- ----
385 * 204372 09-06-09 14:23 decompress_unlzma.i
386 * -------- -------
387 * 204372 1 files
388 * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
389 * 204372 09-06-09 14:23 decompress_unlzma.i
390 * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
391 * Length Date Time Name
392 * -------- ---- ---- ----
393 * 204372 09-06-09 14:23 decompress_unlzma.i
394 * -------- -------
395 * 204372 1 file
396 * # /usr/bin/unzip -l decompress_unlzma.i.zip
397 * Archive: decompress_unlzma.i.zip
398 * Length Date Time Name
399 * -------- ---- ---- ----
400 * 204372 09-06-09 14:23 decompress_unlzma.i
401 * -------- -------
402 * 204372 1 file
403 */
404
405 x_opt_seen = 0;
406 /* '-' makes getopt return 1 for non-options */
407 while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
408 switch (opt) {
409 case 'd': /* Extract to base directory */
410 base_dir = optarg;
411 break;
412
413 case 'l': /* List */
414 listing = 1;
415 break;
416
417 case 'n': /* Never overwrite existing files */
418 overwrite = O_NEVER;
419 break;
420
421 case 'o': /* Always overwrite existing files */
422 overwrite = O_ALWAYS;
423 break;
424
425 case 'p': /* Extract files to stdout and fall through to set verbosity */
426 dst_fd = STDOUT_FILENO;
427
428 case 'q': /* Be quiet */
429 quiet++;
430 break;
431
432 case 'v': /* Verbose list */
433 IF_DESKTOP(verbose++;)
434 listing = 1;
435 break;
436
437 case 'x':
438 x_opt_seen = 1;
439 break;
440
441 case 1:
442 if (!src_fn) {
443 /* The zip file */
444 /* +5: space for ".zip" and NUL */
445 src_fn = xmalloc(strlen(optarg) + 5);
446 strcpy(src_fn, optarg);
447 } else if (!x_opt_seen) {
448 /* Include files */
449 llist_add_to(&zaccept, optarg);
450 } else {
451 /* Exclude files */
452 llist_add_to(&zreject, optarg);
453 }
454 break;
455
456 default:
457 bb_show_usage();
458 }
459 }
460
461 #ifndef __GLIBC__
462 /*
463 * This code is needed for non-GNU getopt
464 * which doesn't understand "-" in option string.
465 * The -x option won't work properly in this case:
466 * "unzip a.zip q -x w e" will be interpreted as
467 * "unzip a.zip q w e -x" = "unzip a.zip q w e"
468 */
469 argv += optind;
470 if (argv[0]) {
471 /* +5: space for ".zip" and NUL */
472 src_fn = xmalloc(strlen(argv[0]) + 5);
473 strcpy(src_fn, argv[0]);
474 while (*++argv)
475 llist_add_to(&zaccept, *argv);
476 }
477 #endif
478
479 if (!src_fn) {
480 bb_show_usage();
481 }
482
483 /* Open input file */
484 if (LONE_DASH(src_fn)) {
485 xdup2(STDIN_FILENO, zip_fd);
486 /* Cannot use prompt mode since zip data is arriving on STDIN */
487 if (overwrite == O_PROMPT)
488 overwrite = O_NEVER;
489 } else {
490 static const char extn[][5] ALIGN1 = { ".zip", ".ZIP" };
491 char *ext = src_fn + strlen(src_fn);
492 int src_fd;
493
494 i = 0;
495 for (;;) {
496 src_fd = open(src_fn, O_RDONLY);
497 if (src_fd >= 0)
498 break;
499 if (++i > 2) {
500 *ext = '\0';
501 bb_error_msg_and_die("can't open %s[.zip]", src_fn);
502 }
503 strcpy(ext, extn[i - 1]);
504 }
505 xmove_fd(src_fd, zip_fd);
506 }
507
508 /* Change dir if necessary */
509 if (base_dir)
510 xchdir(base_dir);
511
512 if (quiet <= 1) { /* not -qq */
513 if (quiet == 0)
514 printf("Archive: %s\n", src_fn);
515 if (listing) {
516 puts(verbose ?
517 " Length Method Size Cmpr Date Time CRC-32 Name\n"
518 "-------- ------ ------- ---- ---------- ----- -------- ----"
519 :
520 " Length Date Time Name\n"
521 "--------- ---------- ----- ----"
522 );
523 }
524 }
525
526 /* Example of an archive with one 0-byte long file named 'z'
527 * created by Zip 2.31 on Unix:
528 * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
529 * sig........ vneed flags compr mtime mdate crc32>
530 * 0010 00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
531 * >..... csize...... usize...... fnlen exlen fn ex>
532 * 0020 54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
533 * >tra_field......................................
534 * 0030 00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
535 * ........... sig........ vmade vneed flags compr
536 * 0040 42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
537 * mtime mdate crc32...... csize...... usize......
538 * 0050 01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
539 * fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
540 * 0060 00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
541 * >..... fn extra_field...........................
542 * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
543 * 0080 34 00 00 00 00 00 |4.....|
544 */
545 total_usize = 0;
546 total_size = 0;
547 total_entries = 0;
548 #if ENABLE_DESKTOP
549 cdf_offset = 0;
550 #endif
551 while (1) {
552 uint32_t magic;
553 mode_t dir_mode = 0777;
554 #if ENABLE_DESKTOP
555 mode_t file_mode = 0666;
556 #endif
557
558 /* Check magic number */
559 xread(zip_fd, &magic, 4);
560 /* Central directory? It's at the end, so exit */
561 if (magic == ZIP_CDF_MAGIC) {
562 dbg("got ZIP_CDF_MAGIC");
563 break;
564 }
565 #if ENABLE_DESKTOP
566 /* Data descriptor? It was a streaming file, go on */
567 if (magic == ZIP_DD_MAGIC) {
568 dbg("got ZIP_DD_MAGIC");
569 /* skip over duplicate crc32, cmpsize and ucmpsize */
570 unzip_skip(3 * 4);
571 continue;
572 }
573 #endif
574 if (magic != ZIP_FILEHEADER_MAGIC)
575 bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
576 dbg("got ZIP_FILEHEADER_MAGIC");
577
578 /* Read the file header */
579 xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
580 FIX_ENDIANNESS_ZIP(zip_header);
581 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
582 bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
583 }
584 #if !ENABLE_DESKTOP
585 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
586 bb_error_msg_and_die("zip flags 1 and 8 are not supported");
587 }
588 #else
589 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
590 /* 0x0001 - encrypted */
591 bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
592 }
593
594 if (cdf_offset != BAD_CDF_OFFSET) {
595 cdf_header_t cdf_header;
596 cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
597 /*
598 * Note: cdf_offset can become BAD_CDF_OFFSET after the above call.
599 */
600 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
601 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
602 * only from Central Directory. See unzip_doc.txt
603 */
604 zip_header.formatted.crc32 = cdf_header.formatted.crc32;
605 zip_header.formatted.cmpsize = cdf_header.formatted.cmpsize;
606 zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
607 }
608 if ((cdf_header.formatted.version_made_by >> 8) == 3) {
609 /* This archive is created on Unix */
610 dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
611 }
612 }
613 if (cdf_offset == BAD_CDF_OFFSET
614 && (zip_header.formatted.zip_flags & SWAP_LE16(0x0008))
615 ) {
616 /* If it's a streaming zip, we _require_ CDF */
617 bb_error_msg_and_die("can't find file table");
618 }
619 #endif
620 dbg("File cmpsize:0x%x extra_len:0x%x ucmpsize:0x%x",
621 (unsigned)zip_header.formatted.cmpsize,
622 (unsigned)zip_header.formatted.extra_len,
623 (unsigned)zip_header.formatted.ucmpsize
624 );
625
626 /* Read filename */
627 free(dst_fn);
628 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
629 xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
630
631 /* Skip extra header bytes */
632 unzip_skip(zip_header.formatted.extra_len);
633
634 /* Guard against "/abspath", "/../" and similar attacks */
635 overlapping_strcpy(dst_fn, strip_unsafe_prefix(dst_fn));
636
637 /* Filter zip entries */
638 if (find_list_entry(zreject, dst_fn)
639 || (zaccept && !find_list_entry(zaccept, dst_fn))
640 ) { /* Skip entry */
641 i = 'n';
642 } else {
643 if (listing) {
644 /* List entry */
645 char dtbuf[sizeof("mm-dd-yyyy hh:mm")];
646 sprintf(dtbuf, "%02u-%02u-%04u %02u:%02u",
647 (zip_header.formatted.moddate >> 5) & 0xf, // mm: 0x01e0
648 (zip_header.formatted.moddate) & 0x1f, // dd: 0x001f
649 (zip_header.formatted.moddate >> 9) + 1980, // yy: 0xfe00
650 (zip_header.formatted.modtime >> 11), // hh: 0xf800
651 (zip_header.formatted.modtime >> 5) & 0x3f // mm: 0x07e0
652 // seconds/2 are not shown, encoded in ----------- 0x001f
653 );
654 if (!verbose) {
655 // " Length Date Time Name\n"
656 // "--------- ---------- ----- ----"
657 printf( "%9u " "%s " "%s\n",
658 (unsigned)zip_header.formatted.ucmpsize,
659 dtbuf,
660 dst_fn);
661 } else {
662 unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
663 if ((int32_t)percents < 0)
664 percents = 0; /* happens if ucmpsize < cmpsize */
665 percents = percents * 100;
666 if (zip_header.formatted.ucmpsize)
667 percents /= zip_header.formatted.ucmpsize;
668 // " Length Method Size Cmpr Date Time CRC-32 Name\n"
669 // "-------- ------ ------- ---- ---------- ----- -------- ----"
670 printf( "%8u %s" "%9u%4u%% " "%s " "%08x " "%s\n",
671 (unsigned)zip_header.formatted.ucmpsize,
672 zip_header.formatted.method == 0 ? "Stored" : "Defl:N", /* Defl is method 8 */
673 /* TODO: show other methods?
674 * 1 - Shrunk
675 * 2 - Reduced with compression factor 1
676 * 3 - Reduced with compression factor 2
677 * 4 - Reduced with compression factor 3
678 * 5 - Reduced with compression factor 4
679 * 6 - Imploded
680 * 7 - Reserved for Tokenizing compression algorithm
681 * 9 - Deflate64
682 * 10 - PKWARE Data Compression Library Imploding
683 * 11 - Reserved by PKWARE
684 * 12 - BZIP2
685 */
686 (unsigned)zip_header.formatted.cmpsize,
687 (unsigned)percents,
688 dtbuf,
689 zip_header.formatted.crc32,
690 dst_fn);
691 total_size += zip_header.formatted.cmpsize;
692 }
693 total_usize += zip_header.formatted.ucmpsize;
694 i = 'n';
695 } else if (dst_fd == STDOUT_FILENO) {
696 /* Extracting to STDOUT */
697 i = -1;
698 } else if (last_char_is(dst_fn, '/')) {
699 /* Extract directory */
700 if (stat(dst_fn, &stat_buf) == -1) {
701 if (errno != ENOENT) {
702 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
703 }
704 if (!quiet) {
705 printf(" creating: %s\n", dst_fn);
706 }
707 unzip_create_leading_dirs(dst_fn);
708 if (bb_make_directory(dst_fn, dir_mode, FILEUTILS_IGNORE_CHMOD_ERR)) {
709 xfunc_die();
710 }
711 } else {
712 if (!S_ISDIR(stat_buf.st_mode)) {
713 bb_error_msg_and_die("'%s' exists but is not a %s",
714 dst_fn, "directory");
715 }
716 }
717 i = 'n';
718 } else {
719 /* Extract file */
720 check_file:
721 if (stat(dst_fn, &stat_buf) == -1) {
722 /* File does not exist */
723 if (errno != ENOENT) {
724 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
725 }
726 i = 'y';
727 } else {
728 /* File already exists */
729 if (overwrite == O_NEVER) {
730 i = 'n';
731 } else if (S_ISREG(stat_buf.st_mode)) {
732 /* File is regular file */
733 if (overwrite == O_ALWAYS) {
734 i = 'y';
735 } else {
736 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
737 my_fgets80(key_buf);
738 i = key_buf[0];
739 }
740 } else {
741 /* File is not regular file */
742 bb_error_msg_and_die("'%s' exists but is not a %s",
743 dst_fn, "regular file");
744 }
745 }
746 }
747 }
748
749 switch (i) {
750 case 'A':
751 overwrite = O_ALWAYS;
752 case 'y': /* Open file and fall into unzip */
753 unzip_create_leading_dirs(dst_fn);
754 #if ENABLE_DESKTOP
755 dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
756 #else
757 dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
758 #endif
759 case -1: /* Unzip */
760 if (!quiet) {
761 printf(" inflating: %s\n", dst_fn);
762 }
763 unzip_extract(&zip_header, dst_fd);
764 if (dst_fd != STDOUT_FILENO) {
765 /* closing STDOUT is potentially bad for future business */
766 close(dst_fd);
767 }
768 break;
769
770 case 'N':
771 overwrite = O_NEVER;
772 case 'n':
773 /* Skip entry data */
774 unzip_skip(zip_header.formatted.cmpsize);
775 break;
776
777 case 'r':
778 /* Prompt for new name */
779 printf("new name: ");
780 my_fgets80(key_buf);
781 free(dst_fn);
782 dst_fn = xstrdup(key_buf);
783 chomp(dst_fn);
784 goto check_file;
785
786 default:
787 printf("error: invalid response [%c]\n", (char)i);
788 goto check_file;
789 }
790
791 total_entries++;
792 }
793
794 if (listing && quiet <= 1) {
795 if (!verbose) {
796 // " Length Date Time Name\n"
797 // "--------- ---------- ----- ----"
798 printf( " --------%21s" "-------\n"
799 "%9lu%21s" "%u files\n",
800 "",
801 total_usize, "", total_entries);
802 } else {
803 unsigned long percents = total_usize - total_size;
804 if ((long)percents < 0)
805 percents = 0; /* happens if usize < size */
806 percents = percents * 100;
807 if (total_usize)
808 percents /= total_usize;
809 // " Length Method Size Cmpr Date Time CRC-32 Name\n"
810 // "-------- ------ ------- ---- ---------- ----- -------- ----"
811 printf( "-------- ------- ----%28s" "----\n"
812 "%8lu" "%17lu%4u%%%28s" "%u files\n",
813 "",
814 total_usize, total_size, (unsigned)percents, "",
815 total_entries);
816 }
817 }
818
819 return 0;
820 }
821