archival/unzip.c

   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 enum {
  49 #if BB_BIG_ENDIAN
  50         ZIP_FILEHEADER_MAGIC = 0x504b0304,
  51         ZIP_CDF_MAGIC        = 0x504b0102, /* central directory's file header */
  52         ZIP_CDE_MAGIC        = 0x504b0506, /* "end of central directory" record */
  53         ZIP_DD_MAGIC         = 0x504b0708,
  54 #else
  55         ZIP_FILEHEADER_MAGIC = 0x04034b50,
  56         ZIP_CDF_MAGIC        = 0x02014b50,
  57         ZIP_CDE_MAGIC        = 0x06054b50,
  58         ZIP_DD_MAGIC         = 0x08074b50,
  59 #endif
  60 };
  61
  62 #define ZIP_HEADER_LEN 26
  63
  64 typedef union {
  65         uint8_t raw[ZIP_HEADER_LEN];
  66         struct {
  67                 uint16_t version;               /* 0-1 */
  68                 uint16_t zip_flags;             /* 2-3 */
  69                 uint16_t method;                /* 4-5 */
  70                 uint16_t modtime;               /* 6-7 */
  71                 uint16_t moddate;               /* 8-9 */
  72                 uint32_t crc32 PACKED;          /* 10-13 */
  73                 uint32_t cmpsize PACKED;        /* 14-17 */
  74                 uint32_t ucmpsize PACKED;       /* 18-21 */
  75                 uint16_t filename_len;          /* 22-23 */
  76                 uint16_t extra_len;             /* 24-25 */
  77         } formatted PACKED;
  78 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
  79
  80 /* Check the offset of the last element, not the length.  This leniency
  81  * allows for poor packing, whereby the overall struct may be too long,
  82  * even though the elements are all in the right place.
  83  */
  84 struct BUG_zip_header_must_be_26_bytes {
  85         char BUG_zip_header_must_be_26_bytes[
  86                 offsetof(zip_header_t, formatted.extra_len) + 2
  87                         == ZIP_HEADER_LEN ? 1 : -1];
  88 };
  89
  90 #define FIX_ENDIANNESS_ZIP(zip_header) do { \
  91         (zip_header).formatted.version      = SWAP_LE16((zip_header).formatted.version     ); \
  92         (zip_header).formatted.method       = SWAP_LE16((zip_header).formatted.method      ); \
  93         (zip_header).formatted.modtime      = SWAP_LE16((zip_header).formatted.modtime     ); \
  94         (zip_header).formatted.moddate      = SWAP_LE16((zip_header).formatted.moddate     ); \
  95         (zip_header).formatted.crc32        = SWAP_LE32((zip_header).formatted.crc32       ); \
  96         (zip_header).formatted.cmpsize      = SWAP_LE32((zip_header).formatted.cmpsize     ); \
  97         (zip_header).formatted.ucmpsize     = SWAP_LE32((zip_header).formatted.ucmpsize    ); \
  98         (zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
  99         (zip_header).formatted.extra_len    = SWAP_LE16((zip_header).formatted.extra_len   ); \
 100 } while (0)
 101
 102 #define CDF_HEADER_LEN 42
 103
 104 typedef union {
 105         uint8_t raw[CDF_HEADER_LEN];
 106         struct {
 107                 /* uint32_t signature; 50 4b 01 02 */
 108                 uint16_t version_made_by;       /* 0-1 */
 109                 uint16_t version_needed;        /* 2-3 */
 110                 uint16_t cdf_flags;             /* 4-5 */
 111                 uint16_t method;                /* 6-7 */
 112                 uint16_t mtime;                 /* 8-9 */
 113                 uint16_t mdate;                 /* 10-11 */
 114                 uint32_t crc32;                 /* 12-15 */
 115                 uint32_t cmpsize;               /* 16-19 */
 116                 uint32_t ucmpsize;              /* 20-23 */
 117                 uint16_t file_name_length;      /* 24-25 */
 118                 uint16_t extra_field_length;    /* 26-27 */
 119                 uint16_t file_comment_length;   /* 28-29 */
 120                 uint16_t disk_number_start;     /* 30-31 */
 121                 uint16_t internal_file_attributes; /* 32-33 */
 122                 uint32_t external_file_attributes PACKED; /* 34-37 */
 123                 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
 124         } formatted PACKED;
 125 } cdf_header_t;
 126
 127 struct BUG_cdf_header_must_be_42_bytes {
 128         char BUG_cdf_header_must_be_42_bytes[
 129                 offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
 130                         == CDF_HEADER_LEN ? 1 : -1];
 131 };
 132
 133 #define FIX_ENDIANNESS_CDF(cdf_header) do { \
 134         (cdf_header).formatted.crc32        = SWAP_LE32((cdf_header).formatted.crc32       ); \
 135         (cdf_header).formatted.cmpsize      = SWAP_LE32((cdf_header).formatted.cmpsize     ); \
 136         (cdf_header).formatted.ucmpsize     = SWAP_LE32((cdf_header).formatted.ucmpsize    ); \
 137         (cdf_header).formatted.file_name_length = SWAP_LE16((cdf_header).formatted.file_name_length); \
 138         (cdf_header).formatted.extra_field_length = SWAP_LE16((cdf_header).formatted.extra_field_length); \
 139         (cdf_header).formatted.file_comment_length = SWAP_LE16((cdf_header).formatted.file_comment_length); \
 140         IF_DESKTOP( \
 141         (cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
 142         (cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
 143         ) \
 144 } while (0)
 145
 146 #define CDE_HEADER_LEN 16
 147
 148 typedef union {
 149         uint8_t raw[CDE_HEADER_LEN];
 150         struct {
 151                 /* uint32_t signature; 50 4b 05 06 */
 152                 uint16_t this_disk_no;
 153                 uint16_t disk_with_cdf_no;
 154                 uint16_t cdf_entries_on_this_disk;
 155                 uint16_t cdf_entries_total;
 156                 uint32_t cdf_size;
 157                 uint32_t cdf_offset;
 158                 /* uint16_t file_comment_length; */
 159                 /* .ZIP file comment (variable size) */
 160         } formatted PACKED;
 161 } cde_header_t;
 162
 163 struct BUG_cde_header_must_be_16_bytes {
 164         char BUG_cde_header_must_be_16_bytes[
 165                 sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
 166 };
 167
 168 #define FIX_ENDIANNESS_CDE(cde_header) do { \
 169         (cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
 170 } while (0)
 171
 172 enum { zip_fd = 3 };
 173
 174
 175 #if ENABLE_DESKTOP
 176
 177 /* Seen in the wild:
 178  * Self-extracting PRO2K3XP_32.exe contains 19078464 byte zip archive,
 179  * where CDE was nearly 48 kbytes before EOF.
 180  * (Surprisingly, it also apparently has *another* CDE structure
 181  * closer to the end, with bogus cdf_offset).
 182  * To make extraction work, bumped PEEK_FROM_END from 16k to 64k.
 183  */
 184 #define PEEK_FROM_END (64*1024)
 185
 186 /* This value means that we failed to find CDF */
 187 #define BAD_CDF_OFFSET ((uint32_t)0xffffffff)
 188
 189 /* NB: does not preserve file position! */
 190 static uint32_t find_cdf_offset(void)
 191 {
 192         cde_header_t cde_header;
 193         unsigned char *p;
 194         off_t end;
 195         unsigned char *buf = xzalloc(PEEK_FROM_END);
 196
 197         end = xlseek(zip_fd, 0, SEEK_END);
 198         end -= PEEK_FROM_END;
 199         if (end < 0)
 200                 end = 0;
 201         xlseek(zip_fd, end, SEEK_SET);
 202         full_read(zip_fd, buf, PEEK_FROM_END);
 203
 204         cde_header.formatted.cdf_offset = BAD_CDF_OFFSET;
 205         p = buf;
 206         while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
 207                 if (*p != 'P') {
 208                         p++;
 209                         continue;
 210                 }
 211                 if (*++p != 'K')
 212                         continue;
 213                 if (*++p != 5)
 214                         continue;
 215                 if (*++p != 6)
 216                         continue;
 217                 /* we found CDE! */
 218                 memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
 219                 FIX_ENDIANNESS_CDE(cde_header);
 220                 /*
 221                  * I've seen .ZIP files with seemingly valid CDEs
 222                  * where cdf_offset points past EOF - ??
 223                  * Ignore such CDEs:
 224                  */
 225                 if (cde_header.formatted.cdf_offset < end + (p - buf))
 226                         break;
 227                 cde_header.formatted.cdf_offset = BAD_CDF_OFFSET;
 228         }
 229         free(buf);
 230         return cde_header.formatted.cdf_offset;
 231 };
 232
 233 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
 234 {
 235         off_t org;
 236
 237         org = xlseek(zip_fd, 0, SEEK_CUR);
 238
 239         if (!cdf_offset)
 240                 cdf_offset = find_cdf_offset();
 241
 242         if (cdf_offset != BAD_CDF_OFFSET) {
 243                 xlseek(zip_fd, cdf_offset + 4, SEEK_SET);
 244                 xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
 245                 FIX_ENDIANNESS_CDF(*cdf_ptr);
 246                 cdf_offset += 4 + CDF_HEADER_LEN
 247                         + cdf_ptr->formatted.file_name_length
 248                         + cdf_ptr->formatted.extra_field_length
 249                         + cdf_ptr->formatted.file_comment_length;
 250         }
 251
 252         xlseek(zip_fd, org, SEEK_SET);
 253         return cdf_offset;
 254 };
 255 #endif
 256
 257 static void unzip_skip(off_t skip)
 258 {
 259         if (skip != 0)
 260                 if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
 261                         bb_copyfd_exact_size(zip_fd, -1, skip);
 262 }
 263
 264 static void unzip_create_leading_dirs(const char *fn)
 265 {
 266         /* Create all leading directories */
 267         char *name = xstrdup(fn);
 268         if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
 269                 xfunc_die(); /* bb_make_directory is noisy */
 270         }
 271         free(name);
 272 }
 273
 274 static void unzip_extract(zip_header_t *zip_header, int dst_fd)
 275 {
 276         if (zip_header->formatted.method == 0) {
 277                 /* Method 0 - stored (not compressed) */
 278                 off_t size = zip_header->formatted.ucmpsize;
 279                 if (size)
 280                         bb_copyfd_exact_size(zip_fd, dst_fd, size);
 281         } else {
 282                 /* Method 8 - inflate */
 283                 transformer_state_t xstate;
 284                 init_transformer_state(&xstate);
 285                 xstate.bytes_in = zip_header->formatted.cmpsize;
 286                 xstate.src_fd = zip_fd;
 287                 xstate.dst_fd = dst_fd;
 288                 if (inflate_unzip(&xstate) < 0)
 289                         bb_error_msg_and_die("inflate error");
 290                 /* Validate decompression - crc */
 291                 if (zip_header->formatted.crc32 != (xstate.crc32 ^ 0xffffffffL)) {
 292                         bb_error_msg_and_die("crc error");
 293                 }
 294                 /* Validate decompression - size */
 295                 if (zip_header->formatted.ucmpsize != xstate.bytes_out) {
 296                         /* Don't die. Who knows, maybe len calculation
 297                          * was botched somewhere. After all, crc matched! */
 298                         bb_error_msg("bad length");
 299                 }
 300         }
 301 }
 302
 303 static void my_fgets80(char *buf80)
 304 {
 305         fflush_all();
 306         if (!fgets(buf80, 80, stdin)) {
 307                 bb_perror_msg_and_die("can't read standard input");
 308         }
 309 }
 310
 311 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 312 int unzip_main(int argc, char **argv)
 313 {
 314         enum { O_PROMPT, O_NEVER, O_ALWAYS };
 315
 316         zip_header_t zip_header;
 317         smallint quiet = 0;
 318         IF_NOT_DESKTOP(const) smallint verbose = 0;
 319         smallint listing = 0;
 320         smallint overwrite = O_PROMPT;
 321         smallint x_opt_seen;
 322 #if ENABLE_DESKTOP
 323         uint32_t cdf_offset;
 324 #endif
 325         unsigned long total_usize;
 326         unsigned long total_size;
 327         unsigned total_entries;
 328         int dst_fd = -1;
 329         char *src_fn = NULL;
 330         char *dst_fn = NULL;
 331         llist_t *zaccept = NULL;
 332         llist_t *zreject = NULL;
 333         char *base_dir = NULL;
 334         int i, opt;
 335         char key_buf[80]; /* must match size used by my_fgets80 */
 336         struct stat stat_buf;
 337
 338 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
 339  *
 340  * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
 341  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 342  * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
 343  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 344  * --------  ------  ------- -----   ----   ----   ------    ----
 345  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 346  * --------          -------  ---                            -------
 347  *   204372            35278  83%                            1 file
 348  * # /usr/bin/unzip -v decompress_unlzma.i.zip
 349  * Archive:  decompress_unlzma.i.zip
 350  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 351  * --------  ------  ------- -----   ----   ----   ------    ----
 352  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 353  * --------          -------  ---                            -------
 354  *   204372            35278  83%                            1 file
 355  * # unzip -v decompress_unlzma.i.zip
 356  * Archive:  decompress_unlzma.i.zip
 357  *   Length     Date   Time    Name
 358  *  --------    ----   ----    ----
 359  *    204372  09-06-09 14:23   decompress_unlzma.i
 360  *  --------                   -------
 361  *    204372                   1 files
 362  * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
 363  *    204372  09-06-09 14:23   decompress_unlzma.i
 364  * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
 365  *   Length     Date   Time    Name
 366  *  --------    ----   ----    ----
 367  *    204372  09-06-09 14:23   decompress_unlzma.i
 368  *  --------                   -------
 369  *    204372                   1 file
 370  * # /usr/bin/unzip -l decompress_unlzma.i.zip
 371  * Archive:  decompress_unlzma.i.zip
 372  *   Length     Date   Time    Name
 373  *  --------    ----   ----    ----
 374  *    204372  09-06-09 14:23   decompress_unlzma.i
 375  *  --------                   -------
 376  *    204372                   1 file
 377  */
 378
 379         x_opt_seen = 0;
 380         /* '-' makes getopt return 1 for non-options */
 381         while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
 382                 switch (opt) {
 383                 case 'd':  /* Extract to base directory */
 384                         base_dir = optarg;
 385                         break;
 386
 387                 case 'l': /* List */
 388                         listing = 1;
 389                         break;
 390
 391                 case 'n': /* Never overwrite existing files */
 392                         overwrite = O_NEVER;
 393                         break;
 394
 395                 case 'o': /* Always overwrite existing files */
 396                         overwrite = O_ALWAYS;
 397                         break;
 398
 399                 case 'p': /* Extract files to stdout and fall through to set verbosity */
 400                         dst_fd = STDOUT_FILENO;
 401
 402                 case 'q': /* Be quiet */
 403                         quiet++;
 404                         break;
 405
 406                 case 'v': /* Verbose list */
 407                         IF_DESKTOP(verbose++;)
 408                         listing = 1;
 409                         break;
 410
 411                 case 'x':
 412                         x_opt_seen = 1;
 413                         break;
 414
 415                 case 1:
 416                         if (!src_fn) {
 417                                 /* The zip file */
 418                                 /* +5: space for ".zip" and NUL */
 419                                 src_fn = xmalloc(strlen(optarg) + 5);
 420                                 strcpy(src_fn, optarg);
 421                         } else if (!x_opt_seen) {
 422                                 /* Include files */
 423                                 llist_add_to(&zaccept, optarg);
 424                         } else {
 425                                 /* Exclude files */
 426                                 llist_add_to(&zreject, optarg);
 427                         }
 428                         break;
 429
 430                 default:
 431                         bb_show_usage();
 432                 }
 433         }
 434
 435 #ifndef __GLIBC__
 436         /*
 437          * This code is needed for non-GNU getopt
 438          * which doesn't understand "-" in option string.
 439          * The -x option won't work properly in this case:
 440          * "unzip a.zip q -x w e" will be interpreted as
 441          * "unzip a.zip q w e -x" = "unzip a.zip q w e"
 442          */
 443         argv += optind;
 444         if (argv[0]) {
 445                 /* +5: space for ".zip" and NUL */
 446                 src_fn = xmalloc(strlen(argv[0]) + 5);
 447                 strcpy(src_fn, argv[0]);
 448                 while (*++argv)
 449                         llist_add_to(&zaccept, *argv);
 450         }
 451 #endif
 452
 453         if (!src_fn) {
 454                 bb_show_usage();
 455         }
 456
 457         /* Open input file */
 458         if (LONE_DASH(src_fn)) {
 459                 xdup2(STDIN_FILENO, zip_fd);
 460                 /* Cannot use prompt mode since zip data is arriving on STDIN */
 461                 if (overwrite == O_PROMPT)
 462                         overwrite = O_NEVER;
 463         } else {
 464                 static const char extn[][5] = { ".zip", ".ZIP" };
 465                 char *ext = src_fn + strlen(src_fn);
 466                 int src_fd;
 467
 468                 i = 0;
 469                 for (;;) {
 470                         src_fd = open(src_fn, O_RDONLY);
 471                         if (src_fd >= 0)
 472                                 break;
 473                         if (++i > 2) {
 474                                 *ext = '\0';
 475                                 bb_error_msg_and_die("can't open %s[.zip]", src_fn);
 476                         }
 477                         strcpy(ext, extn[i - 1]);
 478                 }
 479                 xmove_fd(src_fd, zip_fd);
 480         }
 481
 482         /* Change dir if necessary */
 483         if (base_dir)
 484                 xchdir(base_dir);
 485
 486         if (quiet <= 1) { /* not -qq */
 487                 if (quiet == 0)
 488                         printf("Archive:  %s\n", src_fn);
 489                 if (listing) {
 490                         puts(verbose ?
 491                                 " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 492                                 "--------  ------  ------- -----   ----   ----   ------    ----"
 493                                 :
 494                                 "  Length     Date   Time    Name\n"
 495                                 " --------    ----   ----    ----"
 496                                 );
 497                 }
 498         }
 499
 500 /* Example of an archive with one 0-byte long file named 'z'
 501  * created by Zip 2.31 on Unix:
 502  * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
 503  *       sig........ vneed flags compr mtime mdate crc32>
 504  * 0010  00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
 505  *      >..... csize...... usize...... fnlen exlen fn ex>
 506  * 0020  54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
 507  *      >tra_field......................................
 508  * 0030  00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
 509  *       ........... sig........ vmade vneed flags compr
 510  * 0040  42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
 511  *       mtime mdate crc32...... csize...... usize......
 512  * 0050  01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
 513  *       fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
 514  * 0060  00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
 515  *      >..... fn extra_field...........................
 516  * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
 517  * 0080  34 00 00 00 00 00                               |4.....|
 518  */
 519         total_usize = 0;
 520         total_size = 0;
 521         total_entries = 0;
 522 #if ENABLE_DESKTOP
 523         cdf_offset = 0;
 524 #endif
 525         while (1) {
 526                 uint32_t magic;
 527                 mode_t dir_mode = 0777;
 528 #if ENABLE_DESKTOP
 529                 mode_t file_mode = 0666;
 530 #endif
 531
 532                 /* Check magic number */
 533                 xread(zip_fd, &magic, 4);
 534                 /* Central directory? It's at the end, so exit */
 535                 if (magic == ZIP_CDF_MAGIC)
 536                         break;
 537 #if ENABLE_DESKTOP
 538                 /* Data descriptor? It was a streaming file, go on */
 539                 if (magic == ZIP_DD_MAGIC) {
 540                         /* skip over duplicate crc32, cmpsize and ucmpsize */
 541                         unzip_skip(3 * 4);
 542                         continue;
 543                 }
 544 #endif
 545                 if (magic != ZIP_FILEHEADER_MAGIC)
 546                         bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
 547
 548                 /* Read the file header */
 549                 xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
 550                 FIX_ENDIANNESS_ZIP(zip_header);
 551                 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
 552                         bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
 553                 }
 554 #if !ENABLE_DESKTOP
 555                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
 556                         bb_error_msg_and_die("zip flags 1 and 8 are not supported");
 557                 }
 558 #else
 559                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
 560                         /* 0x0001 - encrypted */
 561                         bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
 562                 }
 563
 564                 if (cdf_offset != BAD_CDF_OFFSET) {
 565                         cdf_header_t cdf_header;
 566                         cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
 567                         /*
 568                          * Note: cdf_offset can become BAD_CDF_OFFSET after the above call.
 569                          */
 570                         if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
 571                                 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
 572                                  * only from Central Directory. See unzip_doc.txt
 573                                  */
 574                                 zip_header.formatted.crc32    = cdf_header.formatted.crc32;
 575                                 zip_header.formatted.cmpsize  = cdf_header.formatted.cmpsize;
 576                                 zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
 577                         }
 578                         if ((cdf_header.formatted.version_made_by >> 8) == 3) {
 579                                 /* This archive is created on Unix */
 580                                 dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
 581                         }
 582                 }
 583                 if (cdf_offset == BAD_CDF_OFFSET
 584                  && (zip_header.formatted.zip_flags & SWAP_LE16(0x0008))
 585                 ) {
 586                         /* If it's a streaming zip, we _require_ CDF */
 587                         bb_error_msg_and_die("can't find file table");
 588                 }
 589 #endif
 590
 591                 /* Read filename */
 592                 free(dst_fn);
 593                 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
 594                 xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
 595
 596                 /* Skip extra header bytes */
 597                 unzip_skip(zip_header.formatted.extra_len);
 598
 599                 /* Guard against "/abspath", "/../" and similar attacks */
 600                 overlapping_strcpy(dst_fn, strip_unsafe_prefix(dst_fn));
 601
 602                 /* Filter zip entries */
 603                 if (find_list_entry(zreject, dst_fn)
 604                  || (zaccept && !find_list_entry(zaccept, dst_fn))
 605                 ) { /* Skip entry */
 606                         i = 'n';
 607
 608                 } else {
 609                         if (listing) {
 610                                 /* List entry */
 611                                 unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
 612                                 if (!verbose) {
 613                                         //      "  Length     Date   Time    Name\n"
 614                                         //      " --------    ----   ----    ----"
 615                                         printf(       "%9u  %02u-%02u-%02u %02u:%02u   %s\n",
 616                                                 (unsigned)zip_header.formatted.ucmpsize,
 617                                                 (dostime & 0x01e00000) >> 21,
 618                                                 (dostime & 0x001f0000) >> 16,
 619                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 620                                                 (dostime & 0x0000f800) >> 11,
 621                                                 (dostime & 0x000007e0) >> 5,
 622                                                 dst_fn);
 623                                         total_usize += zip_header.formatted.ucmpsize;
 624                                 } else {
 625                                         unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
 626                                         percents = percents * 100;
 627                                         if (zip_header.formatted.ucmpsize)
 628                                                 percents /= zip_header.formatted.ucmpsize;
 629                                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 630                                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 631                                         printf(      "%8u  Defl:N"    "%9u%4u%%  %02u-%02u-%02u %02u:%02u  %08x  %s\n",
 632                                                 (unsigned)zip_header.formatted.ucmpsize,
 633                                                 (unsigned)zip_header.formatted.cmpsize,
 634                                                 (unsigned)percents,
 635                                                 (dostime & 0x01e00000) >> 21,
 636                                                 (dostime & 0x001f0000) >> 16,
 637                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 638                                                 (dostime & 0x0000f800) >> 11,
 639                                                 (dostime & 0x000007e0) >> 5,
 640                                                 zip_header.formatted.crc32,
 641                                                 dst_fn);
 642                                         total_usize += zip_header.formatted.ucmpsize;
 643                                         total_size += zip_header.formatted.cmpsize;
 644                                 }
 645                                 i = 'n';
 646                         } else if (dst_fd == STDOUT_FILENO) {
 647                                 /* Extracting to STDOUT */
 648                                 i = -1;
 649                         } else if (last_char_is(dst_fn, '/')) {
 650                                 /* Extract directory */
 651                                 if (stat(dst_fn, &stat_buf) == -1) {
 652                                         if (errno != ENOENT) {
 653                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 654                                         }
 655                                         if (!quiet) {
 656                                                 printf("   creating: %s\n", dst_fn);
 657                                         }
 658                                         unzip_create_leading_dirs(dst_fn);
 659                                         if (bb_make_directory(dst_fn, dir_mode, FILEUTILS_IGNORE_CHMOD_ERR)) {
 660                                                 xfunc_die();
 661                                         }
 662                                 } else {
 663                                         if (!S_ISDIR(stat_buf.st_mode)) {
 664                                                 bb_error_msg_and_die("'%s' exists but is not a %s",
 665                                                         dst_fn, "directory");
 666                                         }
 667                                 }
 668                                 i = 'n';
 669
 670                         } else {
 671                                 /* Extract file */
 672  check_file:
 673                                 if (stat(dst_fn, &stat_buf) == -1) {
 674                                         /* File does not exist */
 675                                         if (errno != ENOENT) {
 676                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 677                                         }
 678                                         i = 'y';
 679                                 } else {
 680                                         /* File already exists */
 681                                         if (overwrite == O_NEVER) {
 682                                                 i = 'n';
 683                                         } else if (S_ISREG(stat_buf.st_mode)) {
 684                                                 /* File is regular file */
 685                                                 if (overwrite == O_ALWAYS) {
 686                                                         i = 'y';
 687                                                 } else {
 688                                                         printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
 689                                                         my_fgets80(key_buf);
 690                                                         i = key_buf[0];
 691                                                 }
 692                                         } else {
 693                                                 /* File is not regular file */
 694                                                 bb_error_msg_and_die("'%s' exists but is not a %s",
 695                                                         dst_fn, "regular file");
 696                                         }
 697                                 }
 698                         }
 699                 }
 700
 701                 switch (i) {
 702                 case 'A':
 703                         overwrite = O_ALWAYS;
 704                 case 'y': /* Open file and fall into unzip */
 705                         unzip_create_leading_dirs(dst_fn);
 706 #if ENABLE_DESKTOP
 707                         dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
 708 #else
 709                         dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
 710 #endif
 711                 case -1: /* Unzip */
 712                         if (!quiet) {
 713                                 printf("  inflating: %s\n", dst_fn);
 714                         }
 715                         unzip_extract(&zip_header, dst_fd);
 716                         if (dst_fd != STDOUT_FILENO) {
 717                                 /* closing STDOUT is potentially bad for future business */
 718                                 close(dst_fd);
 719                         }
 720                         break;
 721
 722                 case 'N':
 723                         overwrite = O_NEVER;
 724                 case 'n':
 725                         /* Skip entry data */
 726                         unzip_skip(zip_header.formatted.cmpsize);
 727                         break;
 728
 729                 case 'r':
 730                         /* Prompt for new name */
 731                         printf("new name: ");
 732                         my_fgets80(key_buf);
 733                         free(dst_fn);
 734                         dst_fn = xstrdup(key_buf);
 735                         chomp(dst_fn);
 736                         goto check_file;
 737
 738                 default:
 739                         printf("error: invalid response [%c]\n", (char)i);
 740                         goto check_file;
 741                 }
 742
 743                 total_entries++;
 744         }
 745
 746         if (listing && quiet <= 1) {
 747                 if (!verbose) {
 748                         //      "  Length     Date   Time    Name\n"
 749                         //      " --------    ----   ----    ----"
 750                         printf( " --------                   -------\n"
 751                                 "%9lu"   "                   %u files\n",
 752                                 total_usize, total_entries);
 753                 } else {
 754                         unsigned long percents = total_usize - total_size;
 755                         percents = percents * 100;
 756                         if (total_usize)
 757                                 percents /= total_usize;
 758                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 759                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 760                         printf( "--------          -------  ---                            -------\n"
 761                                 "%8lu"              "%17lu%4u%%                            %u files\n",
 762                                 total_usize, total_size, (unsigned)percents,
 763                                 total_entries);
 764                 }
 765         }
 766
 767         return 0;
 768 }