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 //config:config UNZIP
20 //config: bool "unzip (26 kb)"
21 //config: default y
22 //config: help
23 //config: unzip will list or extract files from a ZIP archive,
24 //config: commonly found on DOS/WIN systems. The default behavior
25 //config: (with no options) is to extract the archive into the
26 //config: current directory.
27 //config:
28 //config:config FEATURE_UNZIP_CDF
29 //config: bool "Read and use Central Directory data"
30 //config: default y
31 //config: depends on UNZIP
32 //config: help
33 //config: If you know that you only need to deal with simple
34 //config: ZIP files without deleted/updated files, SFX archives etc,
35 //config: you can reduce code size by unselecting this option.
36 //config: To support less trivial ZIPs, say Y.
37 //config:
38 //config:config FEATURE_UNZIP_BZIP2
39 //config: bool "Support compression method 12 (bzip2)"
40 //config: default y
41 //config: depends on FEATURE_UNZIP_CDF && DESKTOP
42 // FEATURE_UNZIP_CDF is needed, otherwise we can't find start of next file
43 // DESKTOP is needed to get back uncompressed length
44 //config:
45 //config:config FEATURE_UNZIP_LZMA
46 //config: bool "Support compression method 14 (lzma)"
47 //config: default y
48 //config: depends on FEATURE_UNZIP_CDF && DESKTOP
49 //config:
50 //config:config FEATURE_UNZIP_XZ
51 //config: bool "Support compression method 95 (xz)"
52 //config: default y
53 //config: depends on FEATURE_UNZIP_CDF && DESKTOP
54
55 //applet:IF_UNZIP(APPLET(unzip, BB_DIR_USR_BIN, BB_SUID_DROP))
56 //kbuild:lib-$(CONFIG_UNZIP) += unzip.o
57
58 //usage:#define unzip_trivial_usage
59 //usage: "[-lnojpq] FILE[.zip] [FILE]... [-x FILE]... [-d DIR]"
60 //usage:#define unzip_full_usage "\n\n"
61 //usage: "Extract FILEs from ZIP archive\n"
62 //usage: "\n -l List contents (with -q for short form)"
63 //usage: "\n -n Never overwrite files (default: ask)"
64 //usage: "\n -o Overwrite"
65 //usage: "\n -j Do not restore paths"
66 //usage: "\n -p Write to stdout"
67 //usage: "\n -t Test"
68 //usage: "\n -q Quiet"
69 //usage: "\n -x FILE Exclude FILEs"
70 //usage: "\n -d DIR Extract into DIR"
71
72 #include "libbb.h"
73 #include "bb_archive.h"
74
75 #if 0
76 # define dbg(...) bb_error_msg(__VA_ARGS__)
77 #else
78 # define dbg(...) ((void)0)
79 #endif
80
81 enum {
82 #if BB_BIG_ENDIAN
83 ZIP_FILEHEADER_MAGIC = 0x504b0304,
84 ZIP_CDF_MAGIC = 0x504b0102, /* CDF item */
85 ZIP_CDE_MAGIC = 0x504b0506, /* End of CDF */
86 ZIP64_CDE_MAGIC = 0x504b0606, /* End of Zip64 CDF */
87 ZIP_DD_MAGIC = 0x504b0708,
88 #else
89 ZIP_FILEHEADER_MAGIC = 0x04034b50,
90 ZIP_CDF_MAGIC = 0x02014b50,
91 ZIP_CDE_MAGIC = 0x06054b50,
92 ZIP64_CDE_MAGIC = 0x06064b50,
93 ZIP_DD_MAGIC = 0x08074b50,
94 #endif
95 };
96
97 #define ZIP_HEADER_LEN 26
98
99 typedef union {
100 uint8_t raw[ZIP_HEADER_LEN];
101 struct {
102 uint16_t version; /* 0-1 */
103 uint16_t zip_flags; /* 2-3 */
104 uint16_t method; /* 4-5 */
105 uint16_t modtime; /* 6-7 */
106 uint16_t moddate; /* 8-9 */
107 uint32_t crc32 PACKED; /* 10-13 */
108 uint32_t cmpsize PACKED; /* 14-17 */
109 uint32_t ucmpsize PACKED; /* 18-21 */
110 uint16_t filename_len; /* 22-23 */
111 uint16_t extra_len; /* 24-25 */
112 /* filename follows (not NUL terminated) */
113 /* extra field follows */
114 /* data follows */
115 } fmt PACKED;
116 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
117
118 #define FIX_ENDIANNESS_ZIP(zip) \
119 do { if (BB_BIG_ENDIAN) { \
120 (zip).fmt.method = SWAP_LE16((zip).fmt.method ); \
121 (zip).fmt.crc32 = SWAP_LE32((zip).fmt.crc32 ); \
122 (zip).fmt.cmpsize = SWAP_LE32((zip).fmt.cmpsize ); \
123 (zip).fmt.ucmpsize = SWAP_LE32((zip).fmt.ucmpsize ); \
124 (zip).fmt.filename_len = SWAP_LE16((zip).fmt.filename_len); \
125 (zip).fmt.extra_len = SWAP_LE16((zip).fmt.extra_len ); \
126 }} while (0)
127
128 #define CDF_HEADER_LEN 42
129
130 typedef union {
131 uint8_t raw[CDF_HEADER_LEN];
132 struct {
133 /* uint32_t signature; 50 4b 01 02 */
134 uint16_t version_made_by; /* 0-1 */
135 uint16_t version_needed; /* 2-3 */
136 uint16_t cdf_flags; /* 4-5 */
137 uint16_t method; /* 6-7 */
138 uint16_t modtime; /* 8-9 */
139 uint16_t moddate; /* 10-11 */
140 uint32_t crc32; /* 12-15 */
141 uint32_t cmpsize; /* 16-19 */
142 uint32_t ucmpsize; /* 20-23 */
143 uint16_t filename_len; /* 24-25 */
144 uint16_t extra_len; /* 26-27 */
145 uint16_t file_comment_length; /* 28-29 */
146 uint16_t disk_number_start; /* 30-31 */
147 uint16_t internal_attributes; /* 32-33 */
148 uint32_t external_attributes PACKED; /* 34-37 */
149 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
150 /* filename follows (not NUL terminated) */
151 /* extra field follows */
152 /* file comment follows */
153 } fmt PACKED;
154 } cdf_header_t;
155
156 #define FIX_ENDIANNESS_CDF(cdf) \
157 do { if (BB_BIG_ENDIAN) { \
158 (cdf).fmt.version_made_by = SWAP_LE16((cdf).fmt.version_made_by); \
159 (cdf).fmt.version_needed = SWAP_LE16((cdf).fmt.version_needed ); \
160 (cdf).fmt.method = SWAP_LE16((cdf).fmt.method ); \
161 (cdf).fmt.modtime = SWAP_LE16((cdf).fmt.modtime ); \
162 (cdf).fmt.moddate = SWAP_LE16((cdf).fmt.moddate ); \
163 (cdf).fmt.crc32 = SWAP_LE32((cdf).fmt.crc32 ); \
164 (cdf).fmt.cmpsize = SWAP_LE32((cdf).fmt.cmpsize ); \
165 (cdf).fmt.ucmpsize = SWAP_LE32((cdf).fmt.ucmpsize ); \
166 (cdf).fmt.filename_len = SWAP_LE16((cdf).fmt.filename_len ); \
167 (cdf).fmt.extra_len = SWAP_LE16((cdf).fmt.extra_len ); \
168 (cdf).fmt.file_comment_length = SWAP_LE16((cdf).fmt.file_comment_length); \
169 (cdf).fmt.external_attributes = SWAP_LE32((cdf).fmt.external_attributes); \
170 }} while (0)
171
172 #define CDE_LEN 16
173
174 typedef union {
175 uint8_t raw[CDE_LEN];
176 struct {
177 /* uint32_t signature; 50 4b 05 06 */
178 uint16_t this_disk_no;
179 uint16_t disk_with_cdf_no;
180 uint16_t cdf_entries_on_this_disk;
181 uint16_t cdf_entries_total;
182 uint32_t cdf_size;
183 uint32_t cdf_offset;
184 /* uint16_t archive_comment_length; */
185 /* archive comment follows */
186 } fmt PACKED;
187 } cde_t;
188
189 #define FIX_ENDIANNESS_CDE(cde) \
190 do { if (BB_BIG_ENDIAN) { \
191 (cde).fmt.cdf_offset = SWAP_LE32((cde).fmt.cdf_offset); \
192 }} while (0)
193
194 struct BUG {
195 /* Check the offset of the last element, not the length. This leniency
196 * allows for poor packing, whereby the overall struct may be too long,
197 * even though the elements are all in the right place.
198 */
199 char BUG_zip_header_must_be_26_bytes[
200 offsetof(zip_header_t, fmt.extra_len) + 2
201 == ZIP_HEADER_LEN ? 1 : -1];
202 char BUG_cdf_header_must_be_42_bytes[
203 offsetof(cdf_header_t, fmt.relative_offset_of_local_header) + 4
204 == CDF_HEADER_LEN ? 1 : -1];
205 char BUG_cde_must_be_16_bytes[
206 sizeof(cde_t) == CDE_LEN ? 1 : -1];
207 };
208
209
210 enum { zip_fd = 3 };
211
212
213 /* This value means that we failed to find CDF */
214 #define BAD_CDF_OFFSET ((uint32_t)0xffffffff)
215
216 #if !ENABLE_FEATURE_UNZIP_CDF
217
218 # define find_cdf_offset() BAD_CDF_OFFSET
219
220 #else
221 /* Seen in the wild:
222 * Self-extracting PRO2K3XP_32.exe contains 19078464 byte zip archive,
223 * where CDE was nearly 48 kbytes before EOF.
224 * (Surprisingly, it also apparently has *another* CDE structure
225 * closer to the end, with bogus cdf_offset).
226 * To make extraction work, bumped PEEK_FROM_END from 16k to 64k.
227 */
228 #define PEEK_FROM_END (64*1024)
229 /* NB: does not preserve file position! */
find_cdf_offset(void)230 static uint32_t find_cdf_offset(void)
231 {
232 cde_t cde;
233 unsigned char *buf;
234 unsigned char *p;
235 off_t end;
236 uint32_t found;
237
238 end = lseek(zip_fd, 0, SEEK_END);
239 if (end == (off_t) -1)
240 return BAD_CDF_OFFSET;
241
242 end -= PEEK_FROM_END;
243 if (end < 0)
244 end = 0;
245
246 dbg("Looking for cdf_offset starting from 0x%"OFF_FMT"x", end);
247 xlseek(zip_fd, end, SEEK_SET);
248 buf = xzalloc(PEEK_FROM_END);
249 full_read(zip_fd, buf, PEEK_FROM_END);
250
251 found = BAD_CDF_OFFSET;
252 p = buf;
253 while (p <= buf + PEEK_FROM_END - CDE_LEN - 4) {
254 if (*p != 'P') {
255 p++;
256 continue;
257 }
258 if (*++p != 'K')
259 continue;
260 if (*++p != 5)
261 continue;
262 if (*++p != 6)
263 continue;
264 /* we found CDE! */
265 memcpy(cde.raw, p + 1, CDE_LEN);
266 dbg("cde.this_disk_no:%d", cde.fmt.this_disk_no );
267 dbg("cde.disk_with_cdf_no:%d", cde.fmt.disk_with_cdf_no );
268 dbg("cde.cdf_entries_on_this_disk:%d", cde.fmt.cdf_entries_on_this_disk);
269 dbg("cde.cdf_entries_total:%d", cde.fmt.cdf_entries_total );
270 dbg("cde.cdf_size:%d", cde.fmt.cdf_size );
271 dbg("cde.cdf_offset:%x", cde.fmt.cdf_offset );
272 FIX_ENDIANNESS_CDE(cde);
273 /*
274 * I've seen .ZIP files with seemingly valid CDEs
275 * where cdf_offset points past EOF - ??
276 * This check ignores such CDEs:
277 */
278 if (cde.fmt.cdf_offset < end + (p - buf)) {
279 found = cde.fmt.cdf_offset;
280 dbg("Possible cdf_offset:0x%x at 0x%"OFF_FMT"x",
281 (unsigned)found, end + (p-3 - buf));
282 dbg(" cdf_offset+cdf_size:0x%x",
283 (unsigned)(found + SWAP_LE32(cde.fmt.cdf_size)));
284 /*
285 * We do not "break" here because only the last CDE is valid.
286 * I've seen a .zip archive which contained a .zip file,
287 * uncompressed, and taking the first CDE was using
288 * the CDE inside that file!
289 */
290 }
291 }
292 free(buf);
293 dbg("Found cdf_offset:0x%x", (unsigned)found);
294 return found;
295 };
296
read_next_cdf(uint32_t cdf_offset,cdf_header_t * cdf)297 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf)
298 {
299 uint32_t magic;
300
301 if (cdf_offset == BAD_CDF_OFFSET)
302 return cdf_offset;
303
304 dbg("Reading CDF at 0x%x", (unsigned)cdf_offset);
305 xlseek(zip_fd, cdf_offset, SEEK_SET);
306 xread(zip_fd, &magic, 4);
307 /* Central Directory End? Assume CDF has ended.
308 * (more correct method is to use cde.cdf_entries_total counter)
309 */
310 if (magic == ZIP_CDE_MAGIC) {
311 dbg("got ZIP_CDE_MAGIC");
312 return 0; /* EOF */
313 }
314 if (magic == ZIP64_CDE_MAGIC) { /* seen in .zip with >4GB files */
315 dbg("got ZIP64_CDE_MAGIC");
316 return 0; /* EOF */
317 }
318 xread(zip_fd, cdf->raw, CDF_HEADER_LEN);
319
320 FIX_ENDIANNESS_CDF(*cdf);
321 dbg(" magic:%08x filename_len:%u extra_len:%u file_comment_length:%u",
322 magic,
323 (unsigned)cdf->fmt.filename_len,
324 (unsigned)cdf->fmt.extra_len,
325 (unsigned)cdf->fmt.file_comment_length
326 );
327 //TODO: require that magic == ZIP_CDF_MAGIC?
328
329 cdf_offset += 4 + CDF_HEADER_LEN
330 + cdf->fmt.filename_len
331 + cdf->fmt.extra_len
332 + cdf->fmt.file_comment_length;
333
334 dbg("Next cdf_offset 0x%x", cdf_offset);
335 return cdf_offset;
336 };
337 #endif
338
die_if_bad_fnamesize(unsigned sz)339 static void die_if_bad_fnamesize(unsigned sz)
340 {
341 if (sz > 0xfff) /* more than 4k?! no funny business please */
342 bb_simple_error_msg_and_die("bad archive");
343 }
344
unzip_skip(off_t skip)345 static void unzip_skip(off_t skip)
346 {
347 if (skip != 0)
348 if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
349 bb_copyfd_exact_size(zip_fd, -1, skip);
350 }
351
unzip_create_leading_dirs(const char * fn)352 static void unzip_create_leading_dirs(const char *fn)
353 {
354 /* Create all leading directories */
355 char *name = xstrdup(fn);
356
357 /* mode of -1: set mode according to umask */
358 if (bb_make_directory(dirname(name), -1, FILEUTILS_RECUR)) {
359 xfunc_die(); /* bb_make_directory is noisy */
360 }
361 free(name);
362 }
363
364 #if ENABLE_FEATURE_UNZIP_CDF
unzip_extract_symlink(llist_t ** symlink_placeholders,zip_header_t * zip,const char * dst_fn)365 static void unzip_extract_symlink(llist_t **symlink_placeholders,
366 zip_header_t *zip,
367 const char *dst_fn)
368 {
369 char *target;
370
371 die_if_bad_fnamesize(zip->fmt.ucmpsize);
372
373 if (zip->fmt.method == 0) {
374 /* Method 0 - stored (not compressed) */
375 target = xzalloc(zip->fmt.ucmpsize + 1);
376 xread(zip_fd, target, zip->fmt.ucmpsize);
377 } else {
378 #if 1
379 bb_simple_error_msg_and_die("compressed symlink is not supported");
380 #else
381 transformer_state_t xstate;
382 init_transformer_state(&xstate);
383 xstate.mem_output_size_max = zip->fmt.ucmpsize;
384 /* ...unpack... */
385 if (!xstate.mem_output_buf)
386 WTF();
387 target = xstate.mem_output_buf;
388 target = xrealloc(target, xstate.mem_output_size + 1);
389 target[xstate.mem_output_size] = '\0';
390 #endif
391 }
392 create_or_remember_link(symlink_placeholders,
393 target,
394 dst_fn,
395 0);
396 free(target);
397 }
398 #endif
399
unzip_extract(zip_header_t * zip,int dst_fd)400 static void unzip_extract(zip_header_t *zip, int dst_fd)
401 {
402 transformer_state_t xstate;
403
404 if (zip->fmt.method == 0) {
405 /* Method 0 - stored (not compressed) */
406 off_t size = zip->fmt.ucmpsize;
407 if (size)
408 bb_copyfd_exact_size(zip_fd, dst_fd, size);
409 return;
410 }
411
412 init_transformer_state(&xstate);
413 xstate.bytes_in = zip->fmt.cmpsize;
414 xstate.src_fd = zip_fd;
415 xstate.dst_fd = dst_fd;
416 if (zip->fmt.method == 8) {
417 /* Method 8 - inflate */
418 if (inflate_unzip(&xstate) < 0)
419 bb_simple_error_msg_and_die("inflate error");
420 /* Validate decompression - crc */
421 if (zip->fmt.crc32 != (xstate.crc32 ^ 0xffffffffL)) {
422 bb_simple_error_msg_and_die("crc error");
423 }
424 }
425 #if ENABLE_FEATURE_UNZIP_BZIP2
426 else if (zip->fmt.method == 12) {
427 /* Tested. Unpacker reads too much, but we use CDF
428 * and will seek to the correct beginning of next file.
429 */
430 xstate.bytes_out = unpack_bz2_stream(&xstate);
431 if (xstate.bytes_out < 0)
432 bb_simple_error_msg_and_die("inflate error");
433 }
434 #endif
435 #if ENABLE_FEATURE_UNZIP_LZMA
436 else if (zip->fmt.method == 14) {
437 /* Not tested yet */
438 xstate.bytes_out = unpack_lzma_stream(&xstate);
439 if (xstate.bytes_out < 0)
440 bb_simple_error_msg_and_die("inflate error");
441 }
442 #endif
443 #if ENABLE_FEATURE_UNZIP_XZ
444 else if (zip->fmt.method == 95) {
445 /* Not tested yet */
446 xstate.bytes_out = unpack_xz_stream(&xstate);
447 if (xstate.bytes_out < 0)
448 bb_simple_error_msg_and_die("inflate error");
449 }
450 #endif
451 else {
452 bb_error_msg_and_die("unsupported method %u", zip->fmt.method);
453 }
454
455 /* Validate decompression - size */
456 if (zip->fmt.ucmpsize != 0xffffffff /* seen on files with >4GB uncompressed data */
457 && zip->fmt.ucmpsize != xstate.bytes_out
458 ) {
459 /* Don't die. Who knows, maybe len calculation
460 * was botched somewhere. After all, crc matched! */
461 bb_simple_error_msg("bad length");
462 }
463 }
464
my_fgets80(char * buf80)465 static void my_fgets80(char *buf80)
466 {
467 fflush_all();
468 if (!fgets(buf80, 80, stdin)) {
469 bb_simple_perror_msg_and_die("can't read standard input");
470 }
471 }
472
get_lstat_mode(const char * dst_fn)473 static int get_lstat_mode(const char *dst_fn)
474 {
475 struct stat stat_buf;
476 if (lstat(dst_fn, &stat_buf) == -1) {
477 if (errno != ENOENT) {
478 bb_perror_msg_and_die("can't stat '%s'",
479 dst_fn
480 );
481 }
482 /* File does not exist */
483 return -1;
484 }
485 return stat_buf.st_mode;
486 }
487
488 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
unzip_main(int argc,char ** argv)489 int unzip_main(int argc, char **argv)
490 {
491 enum {
492 OPT_l = (1 << 0),
493 OPT_x = (1 << 1),
494 OPT_j = (1 << 2),
495 };
496 unsigned opts;
497 smallint quiet = 0;
498 IF_NOT_FEATURE_UNZIP_CDF(const) smallint verbose = 0;
499 enum { O_PROMPT, O_NEVER, O_ALWAYS };
500 smallint overwrite = O_PROMPT;
501 uint32_t cdf_offset;
502 unsigned long total_usize;
503 unsigned long total_size;
504 unsigned total_entries;
505 int dst_fd = -1;
506 char *src_fn = NULL;
507 char *dst_fn = NULL;
508 llist_t *zaccept = NULL;
509 llist_t *zreject = NULL;
510 char *base_dir = NULL;
511 #if ENABLE_FEATURE_UNZIP_CDF
512 llist_t *symlink_placeholders = NULL;
513 #endif
514 int i;
515 char key_buf[80]; /* must match size used by my_fgets80 */
516
517 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
518 *
519 * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
520 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
521 * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
522 * Length Method Size Ratio Date Time CRC-32 Name
523 * -------- ------ ------- ----- ---- ---- ------ ----
524 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
525 * -------- ------- --- -------
526 * 204372 35278 83% 1 file
527 * # /usr/bin/unzip -v decompress_unlzma.i.zip
528 * Archive: decompress_unlzma.i.zip
529 * Length Method Size Ratio Date Time CRC-32 Name
530 * -------- ------ ------- ----- ---- ---- ------ ----
531 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
532 * -------- ------- --- -------
533 * 204372 35278 83% 1 file
534 * # unzip -v decompress_unlzma.i.zip
535 * Archive: decompress_unlzma.i.zip
536 * Length Date Time Name
537 * -------- ---- ---- ----
538 * 204372 09-06-09 14:23 decompress_unlzma.i
539 * -------- -------
540 * 204372 1 files
541 * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
542 * 204372 09-06-09 14:23 decompress_unlzma.i
543 * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
544 * Length Date Time Name
545 * -------- ---- ---- ----
546 * 204372 09-06-09 14:23 decompress_unlzma.i
547 * -------- -------
548 * 204372 1 file
549 * # /usr/bin/unzip -l decompress_unlzma.i.zip
550 * Archive: decompress_unlzma.i.zip
551 * Length Date Time Name
552 * -------- ---- ---- ----
553 * 204372 09-06-09 14:23 decompress_unlzma.i
554 * -------- -------
555 * 204372 1 file
556 */
557
558 opts = 0;
559 /* '-' makes getopt return 1 for non-options */
560 while ((i = getopt(argc, argv, "-d:lnotpqxjv")) != -1) {
561 switch (i) {
562 case 'd': /* Extract to base directory */
563 base_dir = optarg;
564 break;
565
566 case 'l': /* List */
567 opts |= OPT_l;
568 break;
569
570 case 'n': /* Never overwrite existing files */
571 overwrite = O_NEVER;
572 break;
573
574 case 'o': /* Always overwrite existing files */
575 overwrite = O_ALWAYS;
576 break;
577
578 case 't': /* Extract files to /dev/null */
579 xmove_fd(xopen("/dev/null", O_WRONLY), STDOUT_FILENO);
580 /*fallthrough*/
581
582 case 'p': /* Extract files to stdout */
583 dst_fd = STDOUT_FILENO;
584 /*fallthrough*/
585
586 case 'q': /* Be quiet */
587 quiet++;
588 break;
589
590 case 'v': /* Verbose list */
591 IF_FEATURE_UNZIP_CDF(verbose++;)
592 opts |= OPT_l;
593 break;
594
595 case 'x':
596 opts |= OPT_x;
597 break;
598
599 case 'j':
600 opts |= OPT_j;
601 break;
602
603 case 1:
604 if (!src_fn) {
605 /* The zip file */
606 /* +5: space for ".zip" and NUL */
607 src_fn = xmalloc(strlen(optarg) + 5);
608 strcpy(src_fn, optarg);
609 } else if (!(opts & OPT_x)) {
610 /* Include files */
611 llist_add_to(&zaccept, optarg);
612 } else {
613 /* Exclude files */
614 llist_add_to(&zreject, optarg);
615 }
616 break;
617
618 default:
619 bb_show_usage();
620 }
621 }
622
623 #ifndef __GLIBC__
624 /*
625 * This code is needed for non-GNU getopt
626 * which doesn't understand "-" in option string.
627 * The -x option won't work properly in this case:
628 * "unzip a.zip q -x w e" will be interpreted as
629 * "unzip a.zip q w e -x" = "unzip a.zip q w e"
630 */
631 argv += optind;
632 if (argv[0]) {
633 /* +5: space for ".zip" and NUL */
634 src_fn = xmalloc(strlen(argv[0]) + 5);
635 strcpy(src_fn, argv[0]);
636 while (*++argv)
637 llist_add_to(&zaccept, *argv);
638 }
639 #endif
640
641 if (!src_fn) {
642 bb_show_usage();
643 }
644
645 /* Open input file */
646 if (LONE_DASH(src_fn)) {
647 xdup2(STDIN_FILENO, zip_fd);
648 /* Cannot use prompt mode since zip data is arriving on STDIN */
649 if (overwrite == O_PROMPT)
650 overwrite = O_NEVER;
651 } else {
652 static const char extn[][5] ALIGN1 = { ".zip", ".ZIP" };
653 char *ext = src_fn + strlen(src_fn);
654 int src_fd;
655
656 i = 0;
657 for (;;) {
658 src_fd = open(src_fn, O_RDONLY);
659 if (src_fd >= 0)
660 break;
661 if (++i > 2) {
662 *ext = '\0';
663 bb_error_msg_and_die("can't open %s[.zip]",
664 src_fn
665 );
666 }
667 strcpy(ext, extn[i - 1]);
668 }
669 xmove_fd(src_fd, zip_fd);
670 }
671
672 /* Change dir if necessary */
673 if (base_dir) {
674 /* -p DIR: try to create, errors don't matter.
675 * UnZip 6.00 does no multi-level mkdir (-p DIR1/DIR2 syntax),
676 * not using bb_make_directory() here (yet?)
677 */
678 mkdir(base_dir, 0777);
679 xchdir(base_dir);
680 }
681
682 if (quiet <= 1) { /* not -qq */
683 if (quiet == 0) {
684 printf("Archive: %s\n",
685 printable_string(src_fn)
686 );
687 }
688 if (opts & OPT_l) {
689 puts(verbose ?
690 " Length Method Size Cmpr Date Time CRC-32 Name\n"
691 "-------- ------ ------- ---- ---------- ----- -------- ----"
692 :
693 " Length Date Time Name\n"
694 "--------- ---------- ----- ----"
695 );
696 }
697 }
698
699 /* Example of an archive with one 0-byte long file named 'z'
700 * created by Zip 2.31 on Unix:
701 * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
702 * sig........ vneed flags compr mtime mdate crc32>
703 * 0010 00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
704 * >..... csize...... usize...... fnlen exlen fn ex>
705 * 0020 54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
706 * >tra_field......................................
707 * 0030 00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
708 * ........... sig........ vmade vneed flags compr
709 * 0040 42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
710 * mtime mdate crc32...... csize...... usize......
711 * 0050 01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
712 * fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
713 * 0060 00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
714 * >..... fn extra_field...........................
715 * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
716 * 0080 34 00 00 00 00 00 |4.....|
717 */
718 total_usize = 0;
719 total_size = 0;
720 total_entries = 0;
721 cdf_offset = find_cdf_offset(); /* try to seek to the end, find CDE and CDF start */
722 while (1) {
723 zip_header_t zip;
724 mode_t dir_mode = 0777;
725 #if ENABLE_FEATURE_UNZIP_CDF
726 mode_t file_mode = 0666;
727 #endif
728
729 if (!ENABLE_FEATURE_UNZIP_CDF || cdf_offset == BAD_CDF_OFFSET) {
730 /* Normally happens when input is unseekable.
731 *
732 * Valid ZIP file has Central Directory at the end
733 * with central directory file headers (CDFs).
734 * After it, there is a Central Directory End structure.
735 * CDFs identify what files are in the ZIP and where
736 * they are located. This allows ZIP readers to load
737 * the list of files without reading the entire ZIP archive.
738 * ZIP files may be appended to, only files specified in
739 * the CD are valid. Scanning for local file headers is
740 * not a correct algorithm.
741 *
742 * We try to do the above, and resort to "linear" reading
743 * of ZIP file only if seek failed or CDE wasn't found.
744 */
745 uint32_t magic;
746
747 /* Check magic number */
748 xread(zip_fd, &magic, 4);
749 /* CDF item? Assume there are no more files, exit */
750 if (magic == ZIP_CDF_MAGIC) {
751 dbg("got ZIP_CDF_MAGIC");
752 break;
753 }
754 /* Data descriptor? It was a streaming file, go on */
755 if (magic == ZIP_DD_MAGIC) {
756 dbg("got ZIP_DD_MAGIC");
757 /* skip over duplicate crc32, cmpsize and ucmpsize */
758 unzip_skip(3 * 4);
759 continue;
760 }
761 if (magic != ZIP_FILEHEADER_MAGIC)
762 bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
763 dbg("got ZIP_FILEHEADER_MAGIC");
764
765 xread(zip_fd, zip.raw, ZIP_HEADER_LEN);
766 FIX_ENDIANNESS_ZIP(zip);
767 if (zip.fmt.zip_flags & SWAP_LE16(0x0008)) {
768 bb_error_msg_and_die("zip flag %s is not supported",
769 "8 (streaming)");
770 }
771 }
772 #if ENABLE_FEATURE_UNZIP_CDF
773 else {
774 /* cdf_offset is valid (and we know the file is seekable) */
775 cdf_header_t cdf;
776 cdf_offset = read_next_cdf(cdf_offset, &cdf);
777 if (cdf_offset == 0) /* EOF? */
778 break;
779 # if 1
780 xlseek(zip_fd,
781 SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4,
782 SEEK_SET);
783 xread(zip_fd, zip.raw, ZIP_HEADER_LEN);
784 FIX_ENDIANNESS_ZIP(zip);
785 if (zip.fmt.zip_flags & SWAP_LE16(0x0008)) {
786 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
787 * only from Central Directory.
788 */
789 zip.fmt.crc32 = cdf.fmt.crc32;
790 zip.fmt.cmpsize = cdf.fmt.cmpsize;
791 zip.fmt.ucmpsize = cdf.fmt.ucmpsize;
792 }
793 // Seen in some zipfiles: central directory 9 byte extra field contains
794 // a subfield with ID 0x5455 and 5 data bytes, which is a Unix-style UTC mtime.
795 // Local header version:
796 // u16 0x5455 ("UT")
797 // u16 size (1 + 4 * n)
798 // u8 flags: bit 0:mtime is present, bit 1:atime is present, bit 2:ctime is present
799 // u32 mtime
800 // u32 atime
801 // u32 ctime
802 // Central header version:
803 // u16 0x5455 ("UT")
804 // u16 size (5 (or 1?))
805 // u8 flags: bit 0:mtime is present, bit 1:atime is present, bit 2:ctime is present
806 // u32 mtime (CDF does not store atime/ctime)
807 # else
808 /* CDF has the same data as local header, no need to read the latter...
809 * ...not really. An archive was seen with cdf.extra_len == 6 but
810 * zip.extra_len == 0.
811 */
812 memcpy(&zip.fmt.version,
813 &cdf.fmt.version_needed, ZIP_HEADER_LEN);
814 xlseek(zip_fd,
815 SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4 + ZIP_HEADER_LEN,
816 SEEK_SET);
817 # endif
818 if ((cdf.fmt.version_made_by >> 8) == 3) {
819 /* This archive is created on Unix */
820 dir_mode = file_mode = (cdf.fmt.external_attributes >> 16);
821 }
822 }
823 #endif
824
825 if (zip.fmt.zip_flags & SWAP_LE16(0x0001)) {
826 /* 0x0001 - encrypted */
827 bb_error_msg_and_die("zip flag %s is not supported",
828 "1 (encryption)");
829 }
830 dbg("File cmpsize:0x%x extra_len:0x%x ucmpsize:0x%x",
831 (unsigned)zip.fmt.cmpsize,
832 (unsigned)zip.fmt.extra_len,
833 (unsigned)zip.fmt.ucmpsize
834 );
835
836 /* Read filename */
837 free(dst_fn);
838 die_if_bad_fnamesize(zip.fmt.filename_len);
839 dst_fn = xzalloc(zip.fmt.filename_len + 1);
840 xread(zip_fd, dst_fn, zip.fmt.filename_len);
841 /* Skip extra header bytes */
842 unzip_skip(zip.fmt.extra_len);
843
844 /* Guard against "/abspath", "/../" and similar attacks */
845 overlapping_strcpy(dst_fn, strip_unsafe_prefix(dst_fn));
846
847 /* Filter zip entries */
848 if (find_list_entry(zreject, dst_fn)
849 || (zaccept && !find_list_entry(zaccept, dst_fn))
850 ) { /* Skip entry */
851 goto skip_cmpsize;
852 }
853
854 if (opts & OPT_l) {
855 /* List entry */
856 char dtbuf[sizeof("mm-dd-yyyy hh:mm")];
857 sprintf(dtbuf, "%02u-%02u-%04u %02u:%02u",
858 (zip.fmt.moddate >> 5) & 0xf, // mm: 0x01e0
859 (zip.fmt.moddate) & 0x1f, // dd: 0x001f
860 (zip.fmt.moddate >> 9) + 1980, // yy: 0xfe00
861 (zip.fmt.modtime >> 11), // hh: 0xf800
862 (zip.fmt.modtime >> 5) & 0x3f // mm: 0x07e0
863 // seconds/2 not shown, encoded in -- 0x001f
864 );
865 if (!verbose) {
866 // " Length Date Time Name\n"
867 // "--------- ---------- ----- ----"
868 printf( "%9u " "%s " "%s\n",
869 (unsigned)zip.fmt.ucmpsize,
870 dtbuf,
871 printable_string(dst_fn)
872 );
873 } else {
874 char method6[7];
875 unsigned long percents;
876
877 sprintf(method6, "%6u", zip.fmt.method);
878 if (zip.fmt.method == 0) {
879 strcpy(method6, "Stored");
880 }
881 if (zip.fmt.method == 8) {
882 strcpy(method6, "Defl:N");
883 /* normal, maximum, fast, superfast */
884 IF_DESKTOP(method6[5] = "NXFS"[(zip.fmt.zip_flags >> 1) & 3];)
885 }
886 percents = zip.fmt.ucmpsize - zip.fmt.cmpsize;
887 if ((int32_t)percents < 0)
888 percents = 0; /* happens if ucmpsize < cmpsize */
889 percents = percents * 100;
890 if (zip.fmt.ucmpsize)
891 percents /= zip.fmt.ucmpsize;
892 // " Length Method Size Cmpr Date Time CRC-32 Name\n"
893 // "-------- ------ ------- ---- ---------- ----- -------- ----"
894 printf( "%8u %s" "%9u%4u%% " "%s " "%08x " "%s\n",
895 (unsigned)zip.fmt.ucmpsize,
896 method6,
897 (unsigned)zip.fmt.cmpsize,
898 (unsigned)percents,
899 dtbuf,
900 zip.fmt.crc32,
901 printable_string(dst_fn)
902 );
903 total_size += zip.fmt.cmpsize;
904 }
905 total_usize += zip.fmt.ucmpsize;
906 goto skip_cmpsize;
907 }
908
909 if (dst_fd == STDOUT_FILENO) {
910 /* Extracting to STDOUT */
911 goto do_extract;
912 }
913
914 /* Strip paths (after -l: unzip -lj a.zip lists full names) */
915 if (opts & OPT_j)
916 overlapping_strcpy(dst_fn, bb_basename(dst_fn));
917 /* Did this strip everything ("DIR/" case)? Then skip */
918 if (!dst_fn[0])
919 goto skip_cmpsize;
920
921 if (last_char_is(dst_fn, '/')) {
922 int mode;
923
924 /* Extract directory */
925 mode = get_lstat_mode(dst_fn);
926 if (mode == -1) { /* ENOENT */
927 if (!quiet) {
928 printf(" creating: %s\n", printable_string(dst_fn));
929 }
930 unzip_create_leading_dirs(dst_fn);
931 if (bb_make_directory(dst_fn, dir_mode, FILEUTILS_IGNORE_CHMOD_ERR)) {
932 xfunc_die();
933 }
934 } else {
935 if (!S_ISDIR(mode)) {
936 bb_error_msg_and_die("'%s' exists but is not a %s",
937 printable_string(dst_fn),
938 "directory"
939 );
940 }
941 }
942 goto skip_cmpsize;
943 }
944 check_file:
945 /* Does target file already exist? */
946 {
947 int mode = get_lstat_mode(dst_fn);
948 if (mode == -1) {
949 /* ENOENT: does not exist */
950 goto do_open_and_extract;
951 }
952 if (overwrite == O_NEVER) {
953 goto skip_cmpsize;
954 }
955 if (!S_ISREG(mode)) {
956 fishy:
957 bb_error_msg_and_die("'%s' exists but is not a %s",
958 printable_string(dst_fn),
959 "regular file"
960 );
961 }
962 if (overwrite == O_ALWAYS) {
963 goto do_open_and_extract;
964 }
965 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ",
966 printable_string(dst_fn)
967 );
968 my_fgets80(key_buf);
969 /* User input could take a long time. Is it still a regular file? */
970 mode = get_lstat_mode(dst_fn);
971 if (!S_ISREG(mode))
972 goto fishy;
973 }
974
975 /* Extract (or skip) it */
976 switch (key_buf[0]) {
977 case 'A':
978 overwrite = O_ALWAYS;
979 case 'y': /* Open file and fall into unzip */
980 do_open_and_extract:
981 unzip_create_leading_dirs(dst_fn);
982 #if ENABLE_FEATURE_UNZIP_CDF
983 dst_fd = -1;
984 if (!S_ISLNK(file_mode)) {
985 dst_fd = xopen3(dst_fn,
986 O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW,
987 file_mode);
988 }
989 #else
990 /* O_NOFOLLOW defends against symlink attacks */
991 dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW);
992 #endif
993 if (!quiet) {
994 printf(/* zip.fmt.method == 0
995 ? " extracting: %s\n"
996 : */ " inflating: %s\n",
997 printable_string(dst_fn)
998 );
999 }
1000 do_extract:
1001 #if ENABLE_FEATURE_UNZIP_CDF
1002 if (S_ISLNK(file_mode)) {
1003 if (dst_fd != STDOUT_FILENO) /* not -p? */
1004 unzip_extract_symlink(&symlink_placeholders, &zip, dst_fn);
1005 } else
1006 #endif
1007 {
1008 unzip_extract(&zip, dst_fd);
1009 if (dst_fd != STDOUT_FILENO) {
1010 /* closing STDOUT is potentially bad for future business */
1011 close(dst_fd);
1012 }
1013 }
1014 break;
1015
1016 case 'N':
1017 overwrite = O_NEVER;
1018 case 'n': /* Skip entry data */
1019 skip_cmpsize:
1020 unzip_skip(zip.fmt.cmpsize);
1021 break;
1022
1023 case 'r':
1024 /* Prompt for new name */
1025 printf("new name: ");
1026 my_fgets80(key_buf);
1027 free(dst_fn);
1028 dst_fn = xstrdup(key_buf);
1029 chomp(dst_fn);
1030 goto check_file;
1031
1032 default:
1033 printf("error: invalid response [%c]\n", (char)key_buf[0]);
1034 goto check_file;
1035 }
1036
1037 total_entries++;
1038 }
1039
1040 #if ENABLE_FEATURE_UNZIP_CDF
1041 create_links_from_list(symlink_placeholders);
1042 #endif
1043
1044 if ((opts & OPT_l) && quiet <= 1) {
1045 if (!verbose) {
1046 // " Length Date Time Name\n"
1047 // "--------- ---------- ----- ----"
1048 printf( " --------%21s" "-------\n"
1049 "%9lu%21s" "%u files\n",
1050 "",
1051 total_usize, "", total_entries);
1052 } else {
1053 unsigned long percents = total_usize - total_size;
1054 if ((long)percents < 0)
1055 percents = 0; /* happens if usize < size */
1056 percents = percents * 100;
1057 if (total_usize)
1058 percents /= total_usize;
1059 // " Length Method Size Cmpr Date Time CRC-32 Name\n"
1060 // "-------- ------ ------- ---- ---------- ----- -------- ----"
1061 printf( "-------- ------- ----%28s" "----\n"
1062 "%8lu" "%17lu%4u%%%28s" "%u files\n",
1063 "",
1064 total_usize, total_size, (unsigned)percents, "",
1065 total_entries);
1066 }
1067 }
1068
1069 return 0;
1070 }
1071