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 //kbuild:lib-$(CONFIG_UNZIP) += unzip.o
  21
  22 //usage:#define unzip_trivial_usage
  23 //usage:       "[-lnopq] FILE[.zip] [FILE]... [-x FILE...] [-d DIR]"
  24 //usage:#define unzip_full_usage "\n\n"
  25 //usage:       "Extract FILEs from ZIP archive\n"
  26 //usage:     "\n        -l      List contents (with -q for short form)"
  27 //usage:     "\n        -n      Never overwrite files (default: ask)"
  28 //usage:     "\n        -o      Overwrite"
  29 //usage:     "\n        -p      Print to stdout"
  30 //usage:     "\n        -q      Quiet"
  31 //usage:     "\n        -x FILE Exclude FILEs"
  32 //usage:     "\n        -d DIR  Extract into DIR"
  33
  34 #include "libbb.h"
  35 #include "bb_archive.h"
  36
  37 enum {
  38 #if BB_BIG_ENDIAN
  39         ZIP_FILEHEADER_MAGIC = 0x504b0304,
  40         ZIP_CDF_MAGIC        = 0x504b0102, /* central directory's file header */
  41         ZIP_CDE_MAGIC        = 0x504b0506, /* "end of central directory" record */
  42         ZIP_DD_MAGIC         = 0x504b0708,
  43 #else
  44         ZIP_FILEHEADER_MAGIC = 0x04034b50,
  45         ZIP_CDF_MAGIC        = 0x02014b50,
  46         ZIP_CDE_MAGIC        = 0x06054b50,
  47         ZIP_DD_MAGIC         = 0x08074b50,
  48 #endif
  49 };
  50
  51 #define ZIP_HEADER_LEN 26
  52
  53 typedef union {
  54         uint8_t raw[ZIP_HEADER_LEN];
  55         struct {
  56                 uint16_t version;               /* 0-1 */
  57                 uint16_t zip_flags;             /* 2-3 */
  58                 uint16_t method;                /* 4-5 */
  59                 uint16_t modtime;               /* 6-7 */
  60                 uint16_t moddate;               /* 8-9 */
  61                 uint32_t crc32 PACKED;          /* 10-13 */
  62                 uint32_t cmpsize PACKED;        /* 14-17 */
  63                 uint32_t ucmpsize PACKED;       /* 18-21 */
  64                 uint16_t filename_len;          /* 22-23 */
  65                 uint16_t extra_len;             /* 24-25 */
  66         } formatted PACKED;
  67 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
  68
  69 /* Check the offset of the last element, not the length.  This leniency
  70  * allows for poor packing, whereby the overall struct may be too long,
  71  * even though the elements are all in the right place.
  72  */
  73 struct BUG_zip_header_must_be_26_bytes {
  74         char BUG_zip_header_must_be_26_bytes[
  75                 offsetof(zip_header_t, formatted.extra_len) + 2
  76                         == ZIP_HEADER_LEN ? 1 : -1];
  77 };
  78
  79 #define FIX_ENDIANNESS_ZIP(zip_header) do { \
  80         (zip_header).formatted.version      = SWAP_LE16((zip_header).formatted.version     ); \
  81         (zip_header).formatted.method       = SWAP_LE16((zip_header).formatted.method      ); \
  82         (zip_header).formatted.modtime      = SWAP_LE16((zip_header).formatted.modtime     ); \
  83         (zip_header).formatted.moddate      = SWAP_LE16((zip_header).formatted.moddate     ); \
  84         (zip_header).formatted.crc32        = SWAP_LE32((zip_header).formatted.crc32       ); \
  85         (zip_header).formatted.cmpsize      = SWAP_LE32((zip_header).formatted.cmpsize     ); \
  86         (zip_header).formatted.ucmpsize     = SWAP_LE32((zip_header).formatted.ucmpsize    ); \
  87         (zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
  88         (zip_header).formatted.extra_len    = SWAP_LE16((zip_header).formatted.extra_len   ); \
  89 } while (0)
  90
  91 #define CDF_HEADER_LEN 42
  92
  93 typedef union {
  94         uint8_t raw[CDF_HEADER_LEN];
  95         struct {
  96                 /* uint32_t signature; 50 4b 01 02 */
  97                 uint16_t version_made_by;       /* 0-1 */
  98                 uint16_t version_needed;        /* 2-3 */
  99                 uint16_t cdf_flags;             /* 4-5 */
 100                 uint16_t method;                /* 6-7 */
 101                 uint16_t mtime;                 /* 8-9 */
 102                 uint16_t mdate;                 /* 10-11 */
 103                 uint32_t crc32;                 /* 12-15 */
 104                 uint32_t cmpsize;               /* 16-19 */
 105                 uint32_t ucmpsize;              /* 20-23 */
 106                 uint16_t file_name_length;      /* 24-25 */
 107                 uint16_t extra_field_length;    /* 26-27 */
 108                 uint16_t file_comment_length;   /* 28-29 */
 109                 uint16_t disk_number_start;     /* 30-31 */
 110                 uint16_t internal_file_attributes; /* 32-33 */
 111                 uint32_t external_file_attributes PACKED; /* 34-37 */
 112                 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
 113         } formatted PACKED;
 114 } cdf_header_t;
 115
 116 struct BUG_cdf_header_must_be_42_bytes {
 117         char BUG_cdf_header_must_be_42_bytes[
 118                 offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
 119                         == CDF_HEADER_LEN ? 1 : -1];
 120 };
 121
 122 #define FIX_ENDIANNESS_CDF(cdf_header) do { \
 123         (cdf_header).formatted.crc32        = SWAP_LE32((cdf_header).formatted.crc32       ); \
 124         (cdf_header).formatted.cmpsize      = SWAP_LE32((cdf_header).formatted.cmpsize     ); \
 125         (cdf_header).formatted.ucmpsize     = SWAP_LE32((cdf_header).formatted.ucmpsize    ); \
 126         (cdf_header).formatted.file_name_length = SWAP_LE16((cdf_header).formatted.file_name_length); \
 127         (cdf_header).formatted.extra_field_length = SWAP_LE16((cdf_header).formatted.extra_field_length); \
 128         (cdf_header).formatted.file_comment_length = SWAP_LE16((cdf_header).formatted.file_comment_length); \
 129         IF_DESKTOP( \
 130         (cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
 131         (cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
 132         ) \
 133 } while (0)
 134
 135 #define CDE_HEADER_LEN 16
 136
 137 typedef union {
 138         uint8_t raw[CDE_HEADER_LEN];
 139         struct {
 140                 /* uint32_t signature; 50 4b 05 06 */
 141                 uint16_t this_disk_no;
 142                 uint16_t disk_with_cdf_no;
 143                 uint16_t cdf_entries_on_this_disk;
 144                 uint16_t cdf_entries_total;
 145                 uint32_t cdf_size;
 146                 uint32_t cdf_offset;
 147                 /* uint16_t file_comment_length; */
 148                 /* .ZIP file comment (variable size) */
 149         } formatted PACKED;
 150 } cde_header_t;
 151
 152 struct BUG_cde_header_must_be_16_bytes {
 153         char BUG_cde_header_must_be_16_bytes[
 154                 sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
 155 };
 156
 157 #define FIX_ENDIANNESS_CDE(cde_header) do { \
 158         (cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
 159 } while (0)
 160
 161 enum { zip_fd = 3 };
 162
 163
 164 #if ENABLE_DESKTOP
 165
 166 /* Seen in the wild:
 167  * Self-extracting PRO2K3XP_32.exe contains 19078464 byte zip archive,
 168  * where CDE was nearly 48 kbytes before EOF.
 169  * (Surprisingly, it also apparently has *another* CDE structure
 170  * closer to the end, with bogus cdf_offset).
 171  * To make extraction work, bumped PEEK_FROM_END from 16k to 64k.
 172  */
 173 #define PEEK_FROM_END (64*1024)
 174
 175 /* This value means that we failed to find CDF */
 176 #define BAD_CDF_OFFSET ((uint32_t)0xffffffff)
 177
 178 /* NB: does not preserve file position! */
 179 static uint32_t find_cdf_offset(void)
 180 {
 181         cde_header_t cde_header;
 182         unsigned char *p;
 183         off_t end;
 184         unsigned char *buf = xzalloc(PEEK_FROM_END);
 185
 186         end = xlseek(zip_fd, 0, SEEK_END);
 187         end -= PEEK_FROM_END;
 188         if (end < 0)
 189                 end = 0;
 190         xlseek(zip_fd, end, SEEK_SET);
 191         full_read(zip_fd, buf, PEEK_FROM_END);
 192
 193         cde_header.formatted.cdf_offset = BAD_CDF_OFFSET;
 194         p = buf;
 195         while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
 196                 if (*p != 'P') {
 197                         p++;
 198                         continue;
 199                 }
 200                 if (*++p != 'K')
 201                         continue;
 202                 if (*++p != 5)
 203                         continue;
 204                 if (*++p != 6)
 205                         continue;
 206                 /* we found CDE! */
 207                 memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
 208                 FIX_ENDIANNESS_CDE(cde_header);
 209                 /*
 210                  * I've seen .ZIP files with seemingly valid CDEs
 211                  * where cdf_offset points past EOF - ??
 212                  * Ignore such CDEs:
 213                  */
 214                 if (cde_header.formatted.cdf_offset < end + (p - buf))
 215                         break;
 216                 cde_header.formatted.cdf_offset = BAD_CDF_OFFSET;
 217         }
 218         free(buf);
 219         return cde_header.formatted.cdf_offset;
 220 };
 221
 222 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
 223 {
 224         off_t org;
 225
 226         org = xlseek(zip_fd, 0, SEEK_CUR);
 227
 228         if (!cdf_offset)
 229                 cdf_offset = find_cdf_offset();
 230
 231         if (cdf_offset != BAD_CDF_OFFSET) {
 232                 xlseek(zip_fd, cdf_offset + 4, SEEK_SET);
 233                 xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
 234                 FIX_ENDIANNESS_CDF(*cdf_ptr);
 235                 cdf_offset += 4 + CDF_HEADER_LEN
 236                         + cdf_ptr->formatted.file_name_length
 237                         + cdf_ptr->formatted.extra_field_length
 238                         + cdf_ptr->formatted.file_comment_length;
 239         }
 240
 241         xlseek(zip_fd, org, SEEK_SET);
 242         return cdf_offset;
 243 };
 244 #endif
 245
 246 static void unzip_skip(off_t skip)
 247 {
 248         if (skip != 0)
 249                 if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
 250                         bb_copyfd_exact_size(zip_fd, -1, skip);
 251 }
 252
 253 static void unzip_create_leading_dirs(const char *fn)
 254 {
 255         /* Create all leading directories */
 256         char *name = xstrdup(fn);
 257         if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
 258                 xfunc_die(); /* bb_make_directory is noisy */
 259         }
 260         free(name);
 261 }
 262
 263 static void unzip_extract(zip_header_t *zip_header, int dst_fd)
 264 {
 265         if (zip_header->formatted.method == 0) {
 266                 /* Method 0 - stored (not compressed) */
 267                 off_t size = zip_header->formatted.ucmpsize;
 268                 if (size)
 269                         bb_copyfd_exact_size(zip_fd, dst_fd, size);
 270         } else {
 271                 /* Method 8 - inflate */
 272                 transformer_aux_data_t aux;
 273                 init_transformer_aux_data(&aux);
 274                 aux.bytes_in = zip_header->formatted.cmpsize;
 275                 if (inflate_unzip(&aux, zip_fd, dst_fd) < 0)
 276                         bb_error_msg_and_die("inflate error");
 277                 /* Validate decompression - crc */
 278                 if (zip_header->formatted.crc32 != (aux.crc32 ^ 0xffffffffL)) {
 279                         bb_error_msg_and_die("crc error");
 280                 }
 281                 /* Validate decompression - size */
 282                 if (zip_header->formatted.ucmpsize != aux.bytes_out) {
 283                         /* Don't die. Who knows, maybe len calculation
 284                          * was botched somewhere. After all, crc matched! */
 285                         bb_error_msg("bad length");
 286                 }
 287         }
 288 }
 289
 290 static void my_fgets80(char *buf80)
 291 {
 292         fflush_all();
 293         if (!fgets(buf80, 80, stdin)) {
 294                 bb_perror_msg_and_die("can't read standard input");
 295         }
 296 }
 297
 298 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 299 int unzip_main(int argc, char **argv)
 300 {
 301         enum { O_PROMPT, O_NEVER, O_ALWAYS };
 302
 303         zip_header_t zip_header;
 304         smallint quiet = 0;
 305         IF_NOT_DESKTOP(const) smallint verbose = 0;
 306         smallint listing = 0;
 307         smallint overwrite = O_PROMPT;
 308         smallint x_opt_seen;
 309 #if ENABLE_DESKTOP
 310         uint32_t cdf_offset;
 311 #endif
 312         unsigned long total_usize;
 313         unsigned long total_size;
 314         unsigned total_entries;
 315         int dst_fd = -1;
 316         char *src_fn = NULL;
 317         char *dst_fn = NULL;
 318         llist_t *zaccept = NULL;
 319         llist_t *zreject = NULL;
 320         char *base_dir = NULL;
 321         int i, opt;
 322         char key_buf[80]; /* must match size used by my_fgets80 */
 323         struct stat stat_buf;
 324
 325 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
 326  *
 327  * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
 328  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 329  * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
 330  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 331  * --------  ------  ------- -----   ----   ----   ------    ----
 332  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 333  * --------          -------  ---                            -------
 334  *   204372            35278  83%                            1 file
 335  * # /usr/bin/unzip -v decompress_unlzma.i.zip
 336  * Archive:  decompress_unlzma.i.zip
 337  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 338  * --------  ------  ------- -----   ----   ----   ------    ----
 339  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 340  * --------          -------  ---                            -------
 341  *   204372            35278  83%                            1 file
 342  * # unzip -v decompress_unlzma.i.zip
 343  * Archive:  decompress_unlzma.i.zip
 344  *   Length     Date   Time    Name
 345  *  --------    ----   ----    ----
 346  *    204372  09-06-09 14:23   decompress_unlzma.i
 347  *  --------                   -------
 348  *    204372                   1 files
 349  * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
 350  *    204372  09-06-09 14:23   decompress_unlzma.i
 351  * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
 352  *   Length     Date   Time    Name
 353  *  --------    ----   ----    ----
 354  *    204372  09-06-09 14:23   decompress_unlzma.i
 355  *  --------                   -------
 356  *    204372                   1 file
 357  * # /usr/bin/unzip -l decompress_unlzma.i.zip
 358  * Archive:  decompress_unlzma.i.zip
 359  *   Length     Date   Time    Name
 360  *  --------    ----   ----    ----
 361  *    204372  09-06-09 14:23   decompress_unlzma.i
 362  *  --------                   -------
 363  *    204372                   1 file
 364  */
 365
 366         x_opt_seen = 0;
 367         /* '-' makes getopt return 1 for non-options */
 368         while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
 369                 switch (opt) {
 370                 case 'd':  /* Extract to base directory */
 371                         base_dir = optarg;
 372                         break;
 373
 374                 case 'l': /* List */
 375                         listing = 1;
 376                         break;
 377
 378                 case 'n': /* Never overwrite existing files */
 379                         overwrite = O_NEVER;
 380                         break;
 381
 382                 case 'o': /* Always overwrite existing files */
 383                         overwrite = O_ALWAYS;
 384                         break;
 385
 386                 case 'p': /* Extract files to stdout and fall through to set verbosity */
 387                         dst_fd = STDOUT_FILENO;
 388
 389                 case 'q': /* Be quiet */
 390                         quiet++;
 391                         break;
 392
 393                 case 'v': /* Verbose list */
 394                         IF_DESKTOP(verbose++;)
 395                         listing = 1;
 396                         break;
 397
 398                 case 'x':
 399                         x_opt_seen = 1;
 400                         break;
 401
 402                 case 1:
 403                         if (!src_fn) {
 404                                 /* The zip file */
 405                                 /* +5: space for ".zip" and NUL */
 406                                 src_fn = xmalloc(strlen(optarg) + 5);
 407                                 strcpy(src_fn, optarg);
 408                         } else if (!x_opt_seen) {
 409                                 /* Include files */
 410                                 llist_add_to(&zaccept, optarg);
 411                         } else {
 412                                 /* Exclude files */
 413                                 llist_add_to(&zreject, optarg);
 414                         }
 415                         break;
 416
 417                 default:
 418                         bb_show_usage();
 419                 }
 420         }
 421
 422 #ifndef __GLIBC__
 423         /*
 424          * This code is needed for non-GNU getopt
 425          * which doesn't understand "-" in option string.
 426          * The -x option won't work properly in this case:
 427          * "unzip a.zip q -x w e" will be interpreted as
 428          * "unzip a.zip q w e -x" = "unzip a.zip q w e"
 429          */
 430         argv += optind;
 431         if (argv[0]) {
 432                 /* +5: space for ".zip" and NUL */
 433                 src_fn = xmalloc(strlen(argv[0]) + 5);
 434                 strcpy(src_fn, argv[0]);
 435                 while (*++argv)
 436                         llist_add_to(&zaccept, *argv);
 437         }
 438 #endif
 439
 440         if (!src_fn) {
 441                 bb_show_usage();
 442         }
 443
 444         /* Open input file */
 445         if (LONE_DASH(src_fn)) {
 446                 xdup2(STDIN_FILENO, zip_fd);
 447                 /* Cannot use prompt mode since zip data is arriving on STDIN */
 448                 if (overwrite == O_PROMPT)
 449                         overwrite = O_NEVER;
 450         } else {
 451                 static const char extn[][5] = { ".zip", ".ZIP" };
 452                 char *ext = src_fn + strlen(src_fn);
 453                 int src_fd;
 454
 455                 i = 0;
 456                 for (;;) {
 457                         src_fd = open(src_fn, O_RDONLY);
 458                         if (src_fd >= 0)
 459                                 break;
 460                         if (++i > 2) {
 461                                 *ext = '\0';
 462                                 bb_error_msg_and_die("can't open %s[.zip]", src_fn);
 463                         }
 464                         strcpy(ext, extn[i - 1]);
 465                 }
 466                 xmove_fd(src_fd, zip_fd);
 467         }
 468
 469         /* Change dir if necessary */
 470         if (base_dir)
 471                 xchdir(base_dir);
 472
 473         if (quiet <= 1) { /* not -qq */
 474                 if (quiet == 0)
 475                         printf("Archive:  %s\n", src_fn);
 476                 if (listing) {
 477                         puts(verbose ?
 478                                 " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 479                                 "--------  ------  ------- -----   ----   ----   ------    ----"
 480                                 :
 481                                 "  Length     Date   Time    Name\n"
 482                                 " --------    ----   ----    ----"
 483                                 );
 484                 }
 485         }
 486
 487 /* Example of an archive with one 0-byte long file named 'z'
 488  * created by Zip 2.31 on Unix:
 489  * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
 490  *       sig........ vneed flags compr mtime mdate crc32>
 491  * 0010  00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
 492  *      >..... csize...... usize...... fnlen exlen fn ex>
 493  * 0020  54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
 494  *      >tra_field......................................
 495  * 0030  00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
 496  *       ........... sig........ vmade vneed flags compr
 497  * 0040  42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
 498  *       mtime mdate crc32...... csize...... usize......
 499  * 0050  01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
 500  *       fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
 501  * 0060  00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
 502  *      >..... fn extra_field...........................
 503  * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
 504  * 0080  34 00 00 00 00 00                               |4.....|
 505  */
 506         total_usize = 0;
 507         total_size = 0;
 508         total_entries = 0;
 509 #if ENABLE_DESKTOP
 510         cdf_offset = 0;
 511 #endif
 512         while (1) {
 513                 uint32_t magic;
 514                 mode_t dir_mode = 0777;
 515 #if ENABLE_DESKTOP
 516                 mode_t file_mode = 0666;
 517 #endif
 518
 519                 /* Check magic number */
 520                 xread(zip_fd, &magic, 4);
 521                 /* Central directory? It's at the end, so exit */
 522                 if (magic == ZIP_CDF_MAGIC)
 523                         break;
 524 #if ENABLE_DESKTOP
 525                 /* Data descriptor? It was a streaming file, go on */
 526                 if (magic == ZIP_DD_MAGIC) {
 527                         /* skip over duplicate crc32, cmpsize and ucmpsize */
 528                         unzip_skip(3 * 4);
 529                         continue;
 530                 }
 531 #endif
 532                 if (magic != ZIP_FILEHEADER_MAGIC)
 533                         bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
 534
 535                 /* Read the file header */
 536                 xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
 537                 FIX_ENDIANNESS_ZIP(zip_header);
 538                 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
 539                         bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
 540                 }
 541 #if !ENABLE_DESKTOP
 542                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
 543                         bb_error_msg_and_die("zip flags 1 and 8 are not supported");
 544                 }
 545 #else
 546                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
 547                         /* 0x0001 - encrypted */
 548                         bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
 549                 }
 550
 551                 if (cdf_offset != BAD_CDF_OFFSET) {
 552                         cdf_header_t cdf_header;
 553                         cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
 554                         /*
 555                          * Note: cdf_offset can become BAD_CDF_OFFSET after the above call.
 556                          */
 557                         if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
 558                                 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
 559                                  * only from Central Directory. See unzip_doc.txt
 560                                  */
 561                                 zip_header.formatted.crc32    = cdf_header.formatted.crc32;
 562                                 zip_header.formatted.cmpsize  = cdf_header.formatted.cmpsize;
 563                                 zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
 564                         }
 565                         if ((cdf_header.formatted.version_made_by >> 8) == 3) {
 566                                 /* This archive is created on Unix */
 567                                 dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
 568                         }
 569                 }
 570                 if (cdf_offset == BAD_CDF_OFFSET
 571                  && (zip_header.formatted.zip_flags & SWAP_LE16(0x0008))
 572                 ) {
 573                         /* If it's a streaming zip, we _require_ CDF */
 574                         bb_error_msg_and_die("can't find file table");
 575                 }
 576 #endif
 577
 578                 /* Read filename */
 579                 free(dst_fn);
 580                 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
 581                 xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
 582
 583                 /* Skip extra header bytes */
 584                 unzip_skip(zip_header.formatted.extra_len);
 585
 586                 /* Filter zip entries */
 587                 if (find_list_entry(zreject, dst_fn)
 588                  || (zaccept && !find_list_entry(zaccept, dst_fn))
 589                 ) { /* Skip entry */
 590                         i = 'n';
 591
 592                 } else { /* Extract entry */
 593                         if (listing) { /* List entry */
 594                                 unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
 595                                 if (!verbose) {
 596                                         //      "  Length     Date   Time    Name\n"
 597                                         //      " --------    ----   ----    ----"
 598                                         printf(       "%9u  %02u-%02u-%02u %02u:%02u   %s\n",
 599                                                 (unsigned)zip_header.formatted.ucmpsize,
 600                                                 (dostime & 0x01e00000) >> 21,
 601                                                 (dostime & 0x001f0000) >> 16,
 602                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 603                                                 (dostime & 0x0000f800) >> 11,
 604                                                 (dostime & 0x000007e0) >> 5,
 605                                                 dst_fn);
 606                                         total_usize += zip_header.formatted.ucmpsize;
 607                                 } else {
 608                                         unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
 609                                         percents = percents * 100;
 610                                         if (zip_header.formatted.ucmpsize)
 611                                                 percents /= zip_header.formatted.ucmpsize;
 612                                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 613                                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 614                                         printf(      "%8u  Defl:N"    "%9u%4u%%  %02u-%02u-%02u %02u:%02u  %08x  %s\n",
 615                                                 (unsigned)zip_header.formatted.ucmpsize,
 616                                                 (unsigned)zip_header.formatted.cmpsize,
 617                                                 (unsigned)percents,
 618                                                 (dostime & 0x01e00000) >> 21,
 619                                                 (dostime & 0x001f0000) >> 16,
 620                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 621                                                 (dostime & 0x0000f800) >> 11,
 622                                                 (dostime & 0x000007e0) >> 5,
 623                                                 zip_header.formatted.crc32,
 624                                                 dst_fn);
 625                                         total_usize += zip_header.formatted.ucmpsize;
 626                                         total_size += zip_header.formatted.cmpsize;
 627                                 }
 628                                 i = 'n';
 629                         } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
 630                                 i = -1;
 631                         } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
 632                                 if (stat(dst_fn, &stat_buf) == -1) {
 633                                         if (errno != ENOENT) {
 634                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 635                                         }
 636                                         if (!quiet) {
 637                                                 printf("   creating: %s\n", dst_fn);
 638                                         }
 639                                         unzip_create_leading_dirs(dst_fn);
 640                                         if (bb_make_directory(dst_fn, dir_mode, FILEUTILS_IGNORE_CHMOD_ERR)) {
 641                                                 xfunc_die();
 642                                         }
 643                                 } else {
 644                                         if (!S_ISDIR(stat_buf.st_mode)) {
 645                                                 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
 646                                         }
 647                                 }
 648                                 i = 'n';
 649
 650                         } else {  /* Extract file */
 651  check_file:
 652                                 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
 653                                         if (errno != ENOENT) {
 654                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 655                                         }
 656                                         i = 'y';
 657                                 } else { /* File already exists */
 658                                         if (overwrite == O_NEVER) {
 659                                                 i = 'n';
 660                                         } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
 661                                                 if (overwrite == O_ALWAYS) {
 662                                                         i = 'y';
 663                                                 } else {
 664                                                         printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
 665                                                         my_fgets80(key_buf);
 666                                                         i = key_buf[0];
 667                                                 }
 668                                         } else { /* File is not regular file */
 669                                                 bb_error_msg_and_die("'%s' exists but is not regular file", dst_fn);
 670                                         }
 671                                 }
 672                         }
 673                 }
 674
 675                 switch (i) {
 676                 case 'A':
 677                         overwrite = O_ALWAYS;
 678                 case 'y': /* Open file and fall into unzip */
 679                         unzip_create_leading_dirs(dst_fn);
 680 #if ENABLE_DESKTOP
 681                         dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
 682 #else
 683                         dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
 684 #endif
 685                 case -1: /* Unzip */
 686                         if (!quiet) {
 687                                 printf("  inflating: %s\n", dst_fn);
 688                         }
 689                         unzip_extract(&zip_header, dst_fd);
 690                         if (dst_fd != STDOUT_FILENO) {
 691                                 /* closing STDOUT is potentially bad for future business */
 692                                 close(dst_fd);
 693                         }
 694                         break;
 695
 696                 case 'N':
 697                         overwrite = O_NEVER;
 698                 case 'n':
 699                         /* Skip entry data */
 700                         unzip_skip(zip_header.formatted.cmpsize);
 701                         break;
 702
 703                 case 'r':
 704                         /* Prompt for new name */
 705                         printf("new name: ");
 706                         my_fgets80(key_buf);
 707                         free(dst_fn);
 708                         dst_fn = xstrdup(key_buf);
 709                         chomp(dst_fn);
 710                         goto check_file;
 711
 712                 default:
 713                         printf("error: invalid response [%c]\n", (char)i);
 714                         goto check_file;
 715                 }
 716
 717                 total_entries++;
 718         }
 719
 720         if (listing && quiet <= 1) {
 721                 if (!verbose) {
 722                         //      "  Length     Date   Time    Name\n"
 723                         //      " --------    ----   ----    ----"
 724                         printf( " --------                   -------\n"
 725                                 "%9lu"   "                   %u files\n",
 726                                 total_usize, total_entries);
 727                 } else {
 728                         unsigned long percents = total_usize - total_size;
 729                         percents = percents * 100;
 730                         if (total_usize)
 731                                 percents /= total_usize;
 732                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 733                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 734                         printf( "--------          -------  ---                            -------\n"
 735                                 "%8lu"              "%17lu%4u%%                            %u files\n",
 736                                 total_usize, total_size, (unsigned)percents,
 737                                 total_entries);
 738                 }
 739         }
 740
 741         return 0;
 742 }