1 /* vi: set sw=4 ts=4: */
3 * Mini unzip implementation for busybox
5 * Copyright (C) 2004 by Ed Clark
7 * Loosely based on original busybox unzip applet by Laurence Anderson.
8 * All options and features should work in this version.
10 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 * http://www.pkware.com/company/standards/appnote/
14 * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
17 * Zip64 + other methods
20 //config: bool "unzip (24 kb)"
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.
28 //config:config FEATURE_UNZIP_CDF
29 //config: bool "Read and use Central Directory data"
31 //config: depends on UNZIP
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.
38 //config:config FEATURE_UNZIP_BZIP2
39 //config: bool "Support compression method 12 (bzip2)"
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
45 //config:config FEATURE_UNZIP_LZMA
46 //config: bool "Support compression method 14 (lzma)"
48 //config: depends on FEATURE_UNZIP_CDF && DESKTOP
50 //config:config FEATURE_UNZIP_XZ
51 //config: bool "Support compression method 95 (xz)"
53 //config: depends on FEATURE_UNZIP_CDF && DESKTOP
55 //applet:IF_UNZIP(APPLET(unzip, BB_DIR_USR_BIN, BB_SUID_DROP))
56 //kbuild:lib-$(CONFIG_UNZIP) += unzip.o
58 //usage:#define unzip_trivial_usage
59 //usage: "[-lnopq] 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 Print to stdout"
67 //usage: "\n -q Quiet"
68 //usage: "\n -x FILE Exclude FILEs"
69 //usage: "\n -d DIR Extract into DIR"
72 #include "bb_archive.h"
75 # define dbg(...) bb_error_msg(__VA_ARGS__)
77 # define dbg(...) ((void)0)
82 ZIP_FILEHEADER_MAGIC = 0x504b0304,
83 ZIP_CDF_MAGIC = 0x504b0102, /* CDF item */
84 ZIP_CDE_MAGIC = 0x504b0506, /* End of CDF */
85 ZIP_DD_MAGIC = 0x504b0708,
87 ZIP_FILEHEADER_MAGIC = 0x04034b50,
88 ZIP_CDF_MAGIC = 0x02014b50,
89 ZIP_CDE_MAGIC = 0x06054b50,
90 ZIP_DD_MAGIC = 0x08074b50,
94 #define ZIP_HEADER_LEN 26
97 uint8_t raw[ZIP_HEADER_LEN];
99 uint16_t version; /* 0-1 */
100 uint16_t zip_flags; /* 2-3 */
101 uint16_t method; /* 4-5 */
102 uint16_t modtime; /* 6-7 */
103 uint16_t moddate; /* 8-9 */
104 uint32_t crc32 PACKED; /* 10-13 */
105 uint32_t cmpsize PACKED; /* 14-17 */
106 uint32_t ucmpsize PACKED; /* 18-21 */
107 uint16_t filename_len; /* 22-23 */
108 uint16_t extra_len; /* 24-25 */
109 /* filename follows (not NUL terminated) */
110 /* extra field follows */
113 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
115 #define FIX_ENDIANNESS_ZIP(zip) \
116 do { if (BB_BIG_ENDIAN) { \
117 (zip).fmt.crc32 = SWAP_LE32((zip).fmt.crc32 ); \
118 (zip).fmt.cmpsize = SWAP_LE32((zip).fmt.cmpsize ); \
119 (zip).fmt.ucmpsize = SWAP_LE32((zip).fmt.ucmpsize ); \
120 (zip).fmt.filename_len = SWAP_LE16((zip).fmt.filename_len); \
121 (zip).fmt.extra_len = SWAP_LE16((zip).fmt.extra_len ); \
124 #define CDF_HEADER_LEN 42
127 uint8_t raw[CDF_HEADER_LEN];
129 /* uint32_t signature; 50 4b 01 02 */
130 uint16_t version_made_by; /* 0-1 */
131 uint16_t version_needed; /* 2-3 */
132 uint16_t cdf_flags; /* 4-5 */
133 uint16_t method; /* 6-7 */
134 uint16_t modtime; /* 8-9 */
135 uint16_t moddate; /* 10-11 */
136 uint32_t crc32; /* 12-15 */
137 uint32_t cmpsize; /* 16-19 */
138 uint32_t ucmpsize; /* 20-23 */
139 uint16_t filename_len; /* 24-25 */
140 uint16_t extra_len; /* 26-27 */
141 uint16_t file_comment_length; /* 28-29 */
142 uint16_t disk_number_start; /* 30-31 */
143 uint16_t internal_attributes; /* 32-33 */
144 uint32_t external_attributes PACKED; /* 34-37 */
145 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
146 /* filename follows (not NUL terminated) */
147 /* extra field follows */
148 /* file comment follows */
152 #define FIX_ENDIANNESS_CDF(cdf) \
153 do { if (BB_BIG_ENDIAN) { \
154 (cdf).fmt.version_made_by = SWAP_LE16((cdf).fmt.version_made_by); \
155 (cdf).fmt.version_needed = SWAP_LE16((cdf).fmt.version_needed); \
156 (cdf).fmt.method = SWAP_LE16((cdf).fmt.method ); \
157 (cdf).fmt.modtime = SWAP_LE16((cdf).fmt.modtime ); \
158 (cdf).fmt.moddate = SWAP_LE16((cdf).fmt.moddate ); \
159 (cdf).fmt.crc32 = SWAP_LE32((cdf).fmt.crc32 ); \
160 (cdf).fmt.cmpsize = SWAP_LE32((cdf).fmt.cmpsize ); \
161 (cdf).fmt.ucmpsize = SWAP_LE32((cdf).fmt.ucmpsize ); \
162 (cdf).fmt.filename_len = SWAP_LE16((cdf).fmt.filename_len); \
163 (cdf).fmt.extra_len = SWAP_LE16((cdf).fmt.extra_len ); \
164 (cdf).fmt.file_comment_length = SWAP_LE16((cdf).fmt.file_comment_length); \
165 (cdf).fmt.external_attributes = SWAP_LE32((cdf).fmt.external_attributes); \
171 uint8_t raw[CDE_LEN];
173 /* uint32_t signature; 50 4b 05 06 */
174 uint16_t this_disk_no;
175 uint16_t disk_with_cdf_no;
176 uint16_t cdf_entries_on_this_disk;
177 uint16_t cdf_entries_total;
180 /* uint16_t archive_comment_length; */
181 /* archive comment follows */
185 #define FIX_ENDIANNESS_CDE(cde) \
186 do { if (BB_BIG_ENDIAN) { \
187 (cde).fmt.cdf_offset = SWAP_LE32((cde).fmt.cdf_offset); \
191 /* Check the offset of the last element, not the length. This leniency
192 * allows for poor packing, whereby the overall struct may be too long,
193 * even though the elements are all in the right place.
195 char BUG_zip_header_must_be_26_bytes[
196 offsetof(zip_header_t, fmt.extra_len) + 2
197 == ZIP_HEADER_LEN ? 1 : -1];
198 char BUG_cdf_header_must_be_42_bytes[
199 offsetof(cdf_header_t, fmt.relative_offset_of_local_header) + 4
200 == CDF_HEADER_LEN ? 1 : -1];
201 char BUG_cde_must_be_16_bytes[
202 sizeof(cde_t) == CDE_LEN ? 1 : -1];
209 /* This value means that we failed to find CDF */
210 #define BAD_CDF_OFFSET ((uint32_t)0xffffffff)
212 #if !ENABLE_FEATURE_UNZIP_CDF
214 # define find_cdf_offset() BAD_CDF_OFFSET
218 * Self-extracting PRO2K3XP_32.exe contains 19078464 byte zip archive,
219 * where CDE was nearly 48 kbytes before EOF.
220 * (Surprisingly, it also apparently has *another* CDE structure
221 * closer to the end, with bogus cdf_offset).
222 * To make extraction work, bumped PEEK_FROM_END from 16k to 64k.
224 #define PEEK_FROM_END (64*1024)
225 /* NB: does not preserve file position! */
226 static uint32_t find_cdf_offset(void)
234 end = lseek(zip_fd, 0, SEEK_END);
235 if (end == (off_t) -1)
236 return BAD_CDF_OFFSET;
238 end -= PEEK_FROM_END;
242 dbg("Looking for cdf_offset starting from 0x%"OFF_FMT"x", end);
243 xlseek(zip_fd, end, SEEK_SET);
244 buf = xzalloc(PEEK_FROM_END);
245 full_read(zip_fd, buf, PEEK_FROM_END);
247 found = BAD_CDF_OFFSET;
249 while (p <= buf + PEEK_FROM_END - CDE_LEN - 4) {
261 memcpy(cde.raw, p + 1, CDE_LEN);
262 FIX_ENDIANNESS_CDE(cde);
264 * I've seen .ZIP files with seemingly valid CDEs
265 * where cdf_offset points past EOF - ??
266 * This check ignores such CDEs:
268 if (cde.fmt.cdf_offset < end + (p - buf)) {
269 found = cde.fmt.cdf_offset;
270 dbg("Possible cdf_offset:0x%x at 0x%"OFF_FMT"x",
271 (unsigned)found, end + (p-3 - buf));
272 dbg(" cdf_offset+cdf_size:0x%x",
273 (unsigned)(found + SWAP_LE32(cde.fmt.cdf_size)));
275 * We do not "break" here because only the last CDE is valid.
276 * I've seen a .zip archive which contained a .zip file,
277 * uncompressed, and taking the first CDE was using
278 * the CDE inside that file!
283 dbg("Found cdf_offset:0x%x", (unsigned)found);
287 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf)
291 if (cdf_offset == BAD_CDF_OFFSET)
294 dbg("Reading CDF at 0x%x", (unsigned)cdf_offset);
295 xlseek(zip_fd, cdf_offset, SEEK_SET);
296 xread(zip_fd, &magic, 4);
297 /* Central Directory End? Assume CDF has ended.
298 * (more correct method is to use cde.cdf_entries_total counter)
300 if (magic == ZIP_CDE_MAGIC) {
301 dbg("got ZIP_CDE_MAGIC");
304 xread(zip_fd, cdf->raw, CDF_HEADER_LEN);
306 FIX_ENDIANNESS_CDF(*cdf);
307 dbg(" filename_len:%u extra_len:%u file_comment_length:%u",
308 (unsigned)cdf->fmt.filename_len,
309 (unsigned)cdf->fmt.extra_len,
310 (unsigned)cdf->fmt.file_comment_length
312 cdf_offset += 4 + CDF_HEADER_LEN
313 + cdf->fmt.filename_len
315 + cdf->fmt.file_comment_length;
321 static void die_if_bad_fnamesize(unsigned sz)
323 if (sz > 0xfff) /* more than 4k?! no funny business please */
324 bb_error_msg_and_die("bad archive");
327 static void unzip_skip(off_t skip)
330 if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
331 bb_copyfd_exact_size(zip_fd, -1, skip);
334 static void unzip_create_leading_dirs(const char *fn)
336 /* Create all leading directories */
337 char *name = xstrdup(fn);
338 if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
339 xfunc_die(); /* bb_make_directory is noisy */
344 #if ENABLE_FEATURE_UNZIP_CDF
345 static void unzip_extract_symlink(zip_header_t *zip, const char *dst_fn)
349 die_if_bad_fnamesize(zip->fmt.ucmpsize);
351 if (zip->fmt.method == 0) {
352 /* Method 0 - stored (not compressed) */
353 target = xzalloc(zip->fmt.ucmpsize + 1);
354 xread(zip_fd, target, zip->fmt.ucmpsize);
357 bb_error_msg_and_die("compressed symlink is not supported");
359 transformer_state_t xstate;
360 init_transformer_state(&xstate);
361 xstate.mem_output_size_max = zip->fmt.ucmpsize;
363 if (!xstate.mem_output_buf)
365 target = xstate.mem_output_buf;
366 target = xrealloc(target, xstate.mem_output_size + 1);
367 target[xstate.mem_output_size] = '\0';
370 //TODO: libbb candidate
371 if (symlink(target, dst_fn))
372 bb_perror_msg_and_die("can't create symlink '%s'", dst_fn);
377 static void unzip_extract(zip_header_t *zip, int dst_fd)
379 transformer_state_t xstate;
381 if (zip->fmt.method == 0) {
382 /* Method 0 - stored (not compressed) */
383 off_t size = zip->fmt.ucmpsize;
385 bb_copyfd_exact_size(zip_fd, dst_fd, size);
389 init_transformer_state(&xstate);
390 xstate.bytes_in = zip->fmt.cmpsize;
391 xstate.src_fd = zip_fd;
392 xstate.dst_fd = dst_fd;
393 if (zip->fmt.method == 8) {
394 /* Method 8 - inflate */
395 if (inflate_unzip(&xstate) < 0)
396 bb_error_msg_and_die("inflate error");
397 /* Validate decompression - crc */
398 if (zip->fmt.crc32 != (xstate.crc32 ^ 0xffffffffL)) {
399 bb_error_msg_and_die("crc error");
402 #if ENABLE_FEATURE_UNZIP_BZIP2
403 else if (zip->fmt.method == 12) {
404 /* Tested. Unpacker reads too much, but we use CDF
405 * and will seek to the correct beginning of next file.
407 xstate.bytes_out = unpack_bz2_stream(&xstate);
408 if (xstate.bytes_out < 0)
409 bb_error_msg_and_die("inflate error");
412 #if ENABLE_FEATURE_UNZIP_LZMA
413 else if (zip->fmt.method == 14) {
415 xstate.bytes_out = unpack_lzma_stream(&xstate);
416 if (xstate.bytes_out < 0)
417 bb_error_msg_and_die("inflate error");
420 #if ENABLE_FEATURE_UNZIP_XZ
421 else if (zip->fmt.method == 95) {
423 xstate.bytes_out = unpack_xz_stream(&xstate);
424 if (xstate.bytes_out < 0)
425 bb_error_msg_and_die("inflate error");
429 bb_error_msg_and_die("unsupported method %u", zip->fmt.method);
432 /* Validate decompression - size */
433 if (zip->fmt.ucmpsize != xstate.bytes_out) {
434 /* Don't die. Who knows, maybe len calculation
435 * was botched somewhere. After all, crc matched! */
436 bb_error_msg("bad length");
440 static void my_fgets80(char *buf80)
443 if (!fgets(buf80, 80, stdin)) {
444 bb_perror_msg_and_die("can't read standard input");
448 static int get_lstat_mode(const char *dst_fn)
450 struct stat stat_buf;
451 if (lstat(dst_fn, &stat_buf) == -1) {
452 if (errno != ENOENT) {
453 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
455 /* File does not exist */
458 return stat_buf.st_mode;
461 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
462 int unzip_main(int argc, char **argv)
471 IF_NOT_FEATURE_UNZIP_CDF(const) smallint verbose = 0;
472 enum { O_PROMPT, O_NEVER, O_ALWAYS };
473 smallint overwrite = O_PROMPT;
475 unsigned long total_usize;
476 unsigned long total_size;
477 unsigned total_entries;
481 llist_t *zaccept = NULL;
482 llist_t *zreject = NULL;
483 char *base_dir = NULL;
485 char key_buf[80]; /* must match size used by my_fgets80 */
487 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
489 * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
490 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
491 * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
492 * Length Method Size Ratio Date Time CRC-32 Name
493 * -------- ------ ------- ----- ---- ---- ------ ----
494 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
495 * -------- ------- --- -------
496 * 204372 35278 83% 1 file
497 * # /usr/bin/unzip -v decompress_unlzma.i.zip
498 * Archive: decompress_unlzma.i.zip
499 * Length Method Size Ratio Date Time CRC-32 Name
500 * -------- ------ ------- ----- ---- ---- ------ ----
501 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
502 * -------- ------- --- -------
503 * 204372 35278 83% 1 file
504 * # unzip -v decompress_unlzma.i.zip
505 * Archive: decompress_unlzma.i.zip
506 * Length Date Time Name
507 * -------- ---- ---- ----
508 * 204372 09-06-09 14:23 decompress_unlzma.i
511 * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
512 * 204372 09-06-09 14:23 decompress_unlzma.i
513 * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
514 * Length Date Time Name
515 * -------- ---- ---- ----
516 * 204372 09-06-09 14:23 decompress_unlzma.i
519 * # /usr/bin/unzip -l decompress_unlzma.i.zip
520 * Archive: decompress_unlzma.i.zip
521 * Length Date Time Name
522 * -------- ---- ---- ----
523 * 204372 09-06-09 14:23 decompress_unlzma.i
529 /* '-' makes getopt return 1 for non-options */
530 while ((i = getopt(argc, argv, "-d:lnopqxjv")) != -1) {
532 case 'd': /* Extract to base directory */
540 case 'n': /* Never overwrite existing files */
544 case 'o': /* Always overwrite existing files */
545 overwrite = O_ALWAYS;
548 case 'p': /* Extract files to stdout and fall through to set verbosity */
549 dst_fd = STDOUT_FILENO;
551 case 'q': /* Be quiet */
555 case 'v': /* Verbose list */
556 IF_FEATURE_UNZIP_CDF(verbose++;)
571 /* +5: space for ".zip" and NUL */
572 src_fn = xmalloc(strlen(optarg) + 5);
573 strcpy(src_fn, optarg);
574 } else if (!(opts & OPT_x)) {
576 llist_add_to(&zaccept, optarg);
579 llist_add_to(&zreject, optarg);
590 * This code is needed for non-GNU getopt
591 * which doesn't understand "-" in option string.
592 * The -x option won't work properly in this case:
593 * "unzip a.zip q -x w e" will be interpreted as
594 * "unzip a.zip q w e -x" = "unzip a.zip q w e"
598 /* +5: space for ".zip" and NUL */
599 src_fn = xmalloc(strlen(argv[0]) + 5);
600 strcpy(src_fn, argv[0]);
602 llist_add_to(&zaccept, *argv);
610 /* Open input file */
611 if (LONE_DASH(src_fn)) {
612 xdup2(STDIN_FILENO, zip_fd);
613 /* Cannot use prompt mode since zip data is arriving on STDIN */
614 if (overwrite == O_PROMPT)
617 static const char extn[][5] ALIGN1 = { ".zip", ".ZIP" };
618 char *ext = src_fn + strlen(src_fn);
623 src_fd = open(src_fn, O_RDONLY);
628 bb_error_msg_and_die("can't open %s[.zip]", src_fn);
630 strcpy(ext, extn[i - 1]);
632 xmove_fd(src_fd, zip_fd);
635 /* Change dir if necessary */
639 if (quiet <= 1) { /* not -qq */
641 printf("Archive: %s\n", src_fn);
644 " Length Method Size Cmpr Date Time CRC-32 Name\n"
645 "-------- ------ ------- ---- ---------- ----- -------- ----"
647 " Length Date Time Name\n"
648 "--------- ---------- ----- ----"
653 /* Example of an archive with one 0-byte long file named 'z'
654 * created by Zip 2.31 on Unix:
655 * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
656 * sig........ vneed flags compr mtime mdate crc32>
657 * 0010 00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
658 * >..... csize...... usize...... fnlen exlen fn ex>
659 * 0020 54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
660 * >tra_field......................................
661 * 0030 00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
662 * ........... sig........ vmade vneed flags compr
663 * 0040 42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
664 * mtime mdate crc32...... csize...... usize......
665 * 0050 01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
666 * fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
667 * 0060 00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
668 * >..... fn extra_field...........................
669 * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
670 * 0080 34 00 00 00 00 00 |4.....|
675 cdf_offset = find_cdf_offset(); /* try to seek to the end, find CDE and CDF start */
678 mode_t dir_mode = 0777;
679 #if ENABLE_FEATURE_UNZIP_CDF
680 mode_t file_mode = 0666;
683 if (!ENABLE_FEATURE_UNZIP_CDF || cdf_offset == BAD_CDF_OFFSET) {
684 /* Normally happens when input is unseekable.
686 * Valid ZIP file has Central Directory at the end
687 * with central directory file headers (CDFs).
688 * After it, there is a Central Directory End structure.
689 * CDFs identify what files are in the ZIP and where
690 * they are located. This allows ZIP readers to load
691 * the list of files without reading the entire ZIP archive.
692 * ZIP files may be appended to, only files specified in
693 * the CD are valid. Scanning for local file headers is
694 * not a correct algorithm.
696 * We try to do the above, and resort to "linear" reading
697 * of ZIP file only if seek failed or CDE wasn't found.
701 /* Check magic number */
702 xread(zip_fd, &magic, 4);
703 /* CDF item? Assume there are no more files, exit */
704 if (magic == ZIP_CDF_MAGIC) {
705 dbg("got ZIP_CDF_MAGIC");
708 /* Data descriptor? It was a streaming file, go on */
709 if (magic == ZIP_DD_MAGIC) {
710 dbg("got ZIP_DD_MAGIC");
711 /* skip over duplicate crc32, cmpsize and ucmpsize */
715 if (magic != ZIP_FILEHEADER_MAGIC)
716 bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
717 dbg("got ZIP_FILEHEADER_MAGIC");
719 xread(zip_fd, zip.raw, ZIP_HEADER_LEN);
720 FIX_ENDIANNESS_ZIP(zip);
721 if (zip.fmt.zip_flags & SWAP_LE16(0x0008)) {
722 bb_error_msg_and_die("zip flag %s is not supported",
726 #if ENABLE_FEATURE_UNZIP_CDF
728 /* cdf_offset is valid (and we know the file is seekable) */
730 cdf_offset = read_next_cdf(cdf_offset, &cdf);
731 if (cdf_offset == 0) /* EOF? */
735 SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4,
737 xread(zip_fd, zip.raw, ZIP_HEADER_LEN);
738 FIX_ENDIANNESS_ZIP(zip);
739 if (zip.fmt.zip_flags & SWAP_LE16(0x0008)) {
740 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
741 * only from Central Directory.
743 zip.fmt.crc32 = cdf.fmt.crc32;
744 zip.fmt.cmpsize = cdf.fmt.cmpsize;
745 zip.fmt.ucmpsize = cdf.fmt.ucmpsize;
747 // Seen in some zipfiles: central directory 9 byte extra field contains
748 // a subfield with ID 0x5455 and 5 data bytes, which is a Unix-style UTC mtime.
749 // Local header version:
751 // u16 size (1 + 4 * n)
752 // u8 flags: bit 0:mtime is present, bit 1:atime is present, bit 2:ctime is present
756 // Central header version:
758 // u16 size (5 (or 1?))
759 // u8 flags: bit 0:mtime is present, bit 1:atime is present, bit 2:ctime is present
760 // u32 mtime (CDF does not store atime/ctime)
762 /* CDF has the same data as local header, no need to read the latter...
763 * ...not really. An archive was seen with cdf.extra_len == 6 but
764 * zip.extra_len == 0.
766 memcpy(&zip.fmt.version,
767 &cdf.fmt.version_needed, ZIP_HEADER_LEN);
769 SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4 + ZIP_HEADER_LEN,
772 if ((cdf.fmt.version_made_by >> 8) == 3) {
773 /* This archive is created on Unix */
774 dir_mode = file_mode = (cdf.fmt.external_attributes >> 16);
779 if (zip.fmt.zip_flags & SWAP_LE16(0x0001)) {
780 /* 0x0001 - encrypted */
781 bb_error_msg_and_die("zip flag %s is not supported",
784 dbg("File cmpsize:0x%x extra_len:0x%x ucmpsize:0x%x",
785 (unsigned)zip.fmt.cmpsize,
786 (unsigned)zip.fmt.extra_len,
787 (unsigned)zip.fmt.ucmpsize
792 die_if_bad_fnamesize(zip.fmt.filename_len);
793 dst_fn = xzalloc(zip.fmt.filename_len + 1);
794 xread(zip_fd, dst_fn, zip.fmt.filename_len);
795 /* Skip extra header bytes */
796 unzip_skip(zip.fmt.extra_len);
798 /* Guard against "/abspath", "/../" and similar attacks */
799 overlapping_strcpy(dst_fn, strip_unsafe_prefix(dst_fn));
801 if (opts & OPT_j) /* Strip paths? */
802 overlapping_strcpy(dst_fn, bb_basename(dst_fn));
804 /* Did this strip everything ("DIR/" case)? Then skip */
808 /* Filter zip entries */
809 if (find_list_entry(zreject, dst_fn)
810 || (zaccept && !find_list_entry(zaccept, dst_fn))
817 char dtbuf[sizeof("mm-dd-yyyy hh:mm")];
818 sprintf(dtbuf, "%02u-%02u-%04u %02u:%02u",
819 (zip.fmt.moddate >> 5) & 0xf, // mm: 0x01e0
820 (zip.fmt.moddate) & 0x1f, // dd: 0x001f
821 (zip.fmt.moddate >> 9) + 1980, // yy: 0xfe00
822 (zip.fmt.modtime >> 11), // hh: 0xf800
823 (zip.fmt.modtime >> 5) & 0x3f // mm: 0x07e0
824 // seconds/2 not shown, encoded in -- 0x001f
827 // " Length Date Time Name\n"
828 // "--------- ---------- ----- ----"
829 printf( "%9u " "%s " "%s\n",
830 (unsigned)zip.fmt.ucmpsize,
835 unsigned long percents;
837 sprintf(method6, "%6u", zip.fmt.method);
838 if (zip.fmt.method == 0) {
839 strcpy(method6, "Stored");
841 if (zip.fmt.method == 8) {
842 strcpy(method6, "Defl:N");
843 /* normal, maximum, fast, superfast */
844 IF_DESKTOP(method6[5] = "NXFS"[(zip.fmt.zip_flags >> 1) & 3];)
846 percents = zip.fmt.ucmpsize - zip.fmt.cmpsize;
847 if ((int32_t)percents < 0)
848 percents = 0; /* happens if ucmpsize < cmpsize */
849 percents = percents * 100;
850 if (zip.fmt.ucmpsize)
851 percents /= zip.fmt.ucmpsize;
852 // " Length Method Size Cmpr Date Time CRC-32 Name\n"
853 // "-------- ------ ------- ---- ---------- ----- -------- ----"
854 printf( "%8u %s" "%9u%4u%% " "%s " "%08x " "%s\n",
855 (unsigned)zip.fmt.ucmpsize,
857 (unsigned)zip.fmt.cmpsize,
862 total_size += zip.fmt.cmpsize;
864 total_usize += zip.fmt.ucmpsize;
868 if (dst_fd == STDOUT_FILENO) {
869 /* Extracting to STDOUT */
872 if (last_char_is(dst_fn, '/')) {
875 /* Extract directory */
876 mode = get_lstat_mode(dst_fn);
877 if (mode == -1) { /* ENOENT */
879 printf(" creating: %s\n", dst_fn);
881 unzip_create_leading_dirs(dst_fn);
882 if (bb_make_directory(dst_fn, dir_mode, FILEUTILS_IGNORE_CHMOD_ERR)) {
886 if (!S_ISDIR(mode)) {
887 bb_error_msg_and_die("'%s' exists but is not a %s",
888 dst_fn, "directory");
894 /* Does target file already exist? */
896 int mode = get_lstat_mode(dst_fn);
898 /* ENOENT: does not exist */
899 goto do_open_and_extract;
901 if (overwrite == O_NEVER) {
904 if (!S_ISREG(mode)) {
906 bb_error_msg_and_die("'%s' exists but is not a %s",
907 dst_fn, "regular file");
909 if (overwrite == O_ALWAYS) {
910 goto do_open_and_extract;
912 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
914 /* User input could take a long time. Is it still a regular file? */
915 mode = get_lstat_mode(dst_fn);
920 /* Extract (or skip) it */
921 switch (key_buf[0]) {
923 overwrite = O_ALWAYS;
924 case 'y': /* Open file and fall into unzip */
926 unzip_create_leading_dirs(dst_fn);
927 #if ENABLE_FEATURE_UNZIP_CDF
929 if (!S_ISLNK(file_mode)) {
930 dst_fd = xopen3(dst_fn,
931 O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW,
935 /* O_NOFOLLOW defends against symlink attacks */
936 dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW);
940 printf(/* zip.fmt.method == 0
941 ? " extracting: %s\n"
942 : */ " inflating: %s\n", dst_fn);
944 #if ENABLE_FEATURE_UNZIP_CDF
945 if (S_ISLNK(file_mode)) {
946 if (dst_fd != STDOUT_FILENO) /* not -p? */
947 unzip_extract_symlink(&zip, dst_fn);
951 unzip_extract(&zip, dst_fd);
952 if (dst_fd != STDOUT_FILENO) {
953 /* closing STDOUT is potentially bad for future business */
961 case 'n': /* Skip entry data */
963 unzip_skip(zip.fmt.cmpsize);
967 /* Prompt for new name */
968 printf("new name: ");
971 dst_fn = xstrdup(key_buf);
976 printf("error: invalid response [%c]\n", (char)key_buf[0]);
983 if ((opts & OPT_l) && quiet <= 1) {
985 // " Length Date Time Name\n"
986 // "--------- ---------- ----- ----"
987 printf( " --------%21s" "-------\n"
988 "%9lu%21s" "%u files\n",
990 total_usize, "", total_entries);
992 unsigned long percents = total_usize - total_size;
993 if ((long)percents < 0)
994 percents = 0; /* happens if usize < size */
995 percents = percents * 100;
997 percents /= total_usize;
998 // " Length Method Size Cmpr Date Time CRC-32 Name\n"
999 // "-------- ------ ------- ---- ---------- ----- -------- ----"
1000 printf( "-------- ------- ----%28s" "----\n"
1001 "%8lu" "%17lu%4u%%%28s" "%u files\n",
1003 total_usize, total_size, (unsigned)percents, "",