[821] | 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 the GPL v2 or later, see the file LICENSE in this tarball.
|
---|
| 11 | */
|
---|
| 12 |
|
---|
| 13 | /* For reference see
|
---|
| 14 | * http://www.pkware.com/company/standards/appnote/
|
---|
| 15 | * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
|
---|
| 16 | */
|
---|
| 17 |
|
---|
| 18 | /* TODO
|
---|
| 19 | * Endian issues
|
---|
| 20 | * Zip64 + other methods
|
---|
| 21 | * Improve handling of zip format, ie.
|
---|
| 22 | * - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
|
---|
| 23 | * - unix file permissions, etc.
|
---|
| 24 | * - central directory
|
---|
| 25 | */
|
---|
| 26 |
|
---|
[1765] | 27 | #include "libbb.h"
|
---|
[821] | 28 | #include "unarchive.h"
|
---|
| 29 |
|
---|
[1765] | 30 | #define ZIP_FILEHEADER_MAGIC SWAP_LE32(0x04034b50)
|
---|
| 31 | #define ZIP_CDS_MAGIC SWAP_LE32(0x02014b50)
|
---|
| 32 | #define ZIP_CDS_END_MAGIC SWAP_LE32(0x06054b50)
|
---|
| 33 | #define ZIP_DD_MAGIC SWAP_LE32(0x08074b50)
|
---|
[821] | 34 |
|
---|
| 35 | typedef union {
|
---|
| 36 | unsigned char raw[26];
|
---|
| 37 | struct {
|
---|
| 38 | unsigned short version; /* 0-1 */
|
---|
| 39 | unsigned short flags; /* 2-3 */
|
---|
| 40 | unsigned short method; /* 4-5 */
|
---|
| 41 | unsigned short modtime; /* 6-7 */
|
---|
| 42 | unsigned short moddate; /* 8-9 */
|
---|
| 43 | unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
|
---|
| 44 | unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
|
---|
| 45 | unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
|
---|
| 46 | unsigned short filename_len; /* 22-23 */
|
---|
| 47 | unsigned short extra_len; /* 24-25 */
|
---|
[1765] | 48 | } formatted ATTRIBUTE_PACKED;
|
---|
[821] | 49 | } zip_header_t;
|
---|
| 50 |
|
---|
| 51 | static void unzip_skip(int fd, off_t skip)
|
---|
| 52 | {
|
---|
| 53 | if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
|
---|
[1765] | 54 | if (errno != ESPIPE)
|
---|
| 55 | bb_error_msg_and_die("seek failure");
|
---|
| 56 | bb_copyfd_exact_size(fd, -1, skip);
|
---|
[821] | 57 | }
|
---|
| 58 | }
|
---|
| 59 |
|
---|
| 60 | static void unzip_create_leading_dirs(char *fn)
|
---|
| 61 | {
|
---|
| 62 | /* Create all leading directories */
|
---|
[1765] | 63 | char *name = xstrdup(fn);
|
---|
[821] | 64 | if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
|
---|
[1765] | 65 | bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
|
---|
[821] | 66 | }
|
---|
| 67 | free(name);
|
---|
| 68 | }
|
---|
| 69 |
|
---|
| 70 | static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
|
---|
| 71 | {
|
---|
[1765] | 72 | if (zip_header->formatted.method == 0) {
|
---|
[821] | 73 | /* Method 0 - stored (not compressed) */
|
---|
[1765] | 74 | off_t size = zip_header->formatted.ucmpsize;
|
---|
| 75 | if (size)
|
---|
| 76 | bb_copyfd_exact_size(src_fd, dst_fd, size);
|
---|
[821] | 77 | } else {
|
---|
| 78 | /* Method 8 - inflate */
|
---|
[1765] | 79 | inflate_unzip_result res;
|
---|
| 80 | /* err = */ inflate_unzip(&res, zip_header->formatted.cmpsize, src_fd, dst_fd);
|
---|
| 81 | // we should check for -1 error return
|
---|
[821] | 82 | /* Validate decompression - crc */
|
---|
[1765] | 83 | if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
|
---|
| 84 | bb_error_msg("invalid compressed data--%s error", "crc");
|
---|
[821] | 85 | return 1;
|
---|
| 86 | }
|
---|
| 87 | /* Validate decompression - size */
|
---|
[1765] | 88 | if (zip_header->formatted.ucmpsize != res.bytes_out) {
|
---|
| 89 | bb_error_msg("invalid compressed data--%s error", "length");
|
---|
[821] | 90 | return 1;
|
---|
| 91 | }
|
---|
| 92 | }
|
---|
| 93 | return 0;
|
---|
| 94 | }
|
---|
| 95 |
|
---|
[1765] | 96 | int unzip_main(int argc, char **argv);
|
---|
[821] | 97 | int unzip_main(int argc, char **argv)
|
---|
| 98 | {
|
---|
| 99 | zip_header_t zip_header;
|
---|
| 100 | enum {v_silent, v_normal, v_list} verbosity = v_normal;
|
---|
| 101 | enum {o_prompt, o_never, o_always} overwrite = o_prompt;
|
---|
| 102 | unsigned int total_size = 0;
|
---|
| 103 | unsigned int total_entries = 0;
|
---|
| 104 | int src_fd = -1, dst_fd = -1;
|
---|
| 105 | char *src_fn = NULL, *dst_fn = NULL;
|
---|
| 106 | llist_t *zaccept = NULL;
|
---|
| 107 | llist_t *zreject = NULL;
|
---|
| 108 | char *base_dir = NULL;
|
---|
| 109 | int failed, i, opt, opt_range = 0, list_header_done = 0;
|
---|
| 110 | char key_buf[512];
|
---|
| 111 | struct stat stat_buf;
|
---|
| 112 |
|
---|
[1765] | 113 | while ((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
|
---|
| 114 | switch (opt_range) {
|
---|
[821] | 115 | case 0: /* Options */
|
---|
[1765] | 116 | switch (opt) {
|
---|
[821] | 117 | case 'l': /* List */
|
---|
| 118 | verbosity = v_list;
|
---|
| 119 | break;
|
---|
| 120 |
|
---|
| 121 | case 'n': /* Never overwrite existing files */
|
---|
| 122 | overwrite = o_never;
|
---|
| 123 | break;
|
---|
| 124 |
|
---|
| 125 | case 'o': /* Always overwrite existing files */
|
---|
| 126 | overwrite = o_always;
|
---|
| 127 | break;
|
---|
| 128 |
|
---|
| 129 | case 'p': /* Extract files to stdout and fall through to set verbosity */
|
---|
| 130 | dst_fd = STDOUT_FILENO;
|
---|
| 131 |
|
---|
| 132 | case 'q': /* Be quiet */
|
---|
| 133 | verbosity = (verbosity == v_normal) ? v_silent : verbosity;
|
---|
| 134 | break;
|
---|
| 135 |
|
---|
| 136 | case 1 : /* The zip file */
|
---|
[1765] | 137 | src_fn = xmalloc(strlen(optarg)+4);
|
---|
| 138 | strcpy(src_fn, optarg);
|
---|
[821] | 139 | opt_range++;
|
---|
| 140 | break;
|
---|
| 141 |
|
---|
| 142 | default:
|
---|
| 143 | bb_show_usage();
|
---|
| 144 |
|
---|
| 145 | }
|
---|
| 146 | break;
|
---|
| 147 |
|
---|
| 148 | case 1: /* Include files */
|
---|
| 149 | if (opt == 1) {
|
---|
| 150 | llist_add_to(&zaccept, optarg);
|
---|
| 151 |
|
---|
| 152 | } else if (opt == 'd') {
|
---|
| 153 | base_dir = optarg;
|
---|
| 154 | opt_range += 2;
|
---|
| 155 |
|
---|
| 156 | } else if (opt == 'x') {
|
---|
| 157 | opt_range++;
|
---|
| 158 |
|
---|
| 159 | } else {
|
---|
| 160 | bb_show_usage();
|
---|
| 161 | }
|
---|
| 162 | break;
|
---|
| 163 |
|
---|
| 164 | case 2 : /* Exclude files */
|
---|
| 165 | if (opt == 1) {
|
---|
| 166 | llist_add_to(&zreject, optarg);
|
---|
| 167 |
|
---|
| 168 | } else if (opt == 'd') { /* Extract to base directory */
|
---|
| 169 | base_dir = optarg;
|
---|
| 170 | opt_range++;
|
---|
| 171 |
|
---|
| 172 | } else {
|
---|
| 173 | bb_show_usage();
|
---|
| 174 | }
|
---|
| 175 | break;
|
---|
| 176 |
|
---|
| 177 | default:
|
---|
| 178 | bb_show_usage();
|
---|
| 179 | }
|
---|
| 180 | }
|
---|
| 181 |
|
---|
| 182 | if (src_fn == NULL) {
|
---|
| 183 | bb_show_usage();
|
---|
| 184 | }
|
---|
| 185 |
|
---|
| 186 | /* Open input file */
|
---|
[1765] | 187 | if (LONE_DASH(src_fn)) {
|
---|
[821] | 188 | src_fd = STDIN_FILENO;
|
---|
| 189 | /* Cannot use prompt mode since zip data is arriving on STDIN */
|
---|
| 190 | overwrite = (overwrite == o_prompt) ? o_never : overwrite;
|
---|
| 191 | } else {
|
---|
| 192 | static const char *const extn[] = {"", ".zip", ".ZIP"};
|
---|
| 193 | int orig_src_fn_len = strlen(src_fn);
|
---|
[1765] | 194 | for (i = 0; (i < 3) && (src_fd == -1); i++) {
|
---|
[821] | 195 | strcpy(src_fn + orig_src_fn_len, extn[i]);
|
---|
| 196 | src_fd = open(src_fn, O_RDONLY);
|
---|
| 197 | }
|
---|
| 198 | if (src_fd == -1) {
|
---|
[1765] | 199 | src_fn[orig_src_fn_len] = '\0';
|
---|
| 200 | bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
|
---|
[821] | 201 | }
|
---|
| 202 | }
|
---|
| 203 |
|
---|
| 204 | /* Change dir if necessary */
|
---|
| 205 | if (base_dir)
|
---|
[1765] | 206 | xchdir(base_dir);
|
---|
[821] | 207 |
|
---|
| 208 | if (verbosity != v_silent)
|
---|
| 209 | printf("Archive: %s\n", src_fn);
|
---|
| 210 |
|
---|
| 211 | failed = 0;
|
---|
| 212 |
|
---|
| 213 | while (1) {
|
---|
| 214 | unsigned int magic;
|
---|
| 215 |
|
---|
| 216 | /* Check magic number */
|
---|
[1765] | 217 | xread(src_fd, &magic, 4);
|
---|
[821] | 218 | if (magic == ZIP_CDS_MAGIC) {
|
---|
| 219 | break;
|
---|
| 220 | } else if (magic != ZIP_FILEHEADER_MAGIC) {
|
---|
[1765] | 221 | bb_error_msg_and_die("invalid zip magic %08X", magic);
|
---|
[821] | 222 | }
|
---|
| 223 |
|
---|
| 224 | /* Read the file header */
|
---|
[1765] | 225 | xread(src_fd, zip_header.raw, 26);
|
---|
| 226 | zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
|
---|
| 227 | zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
|
---|
| 228 | zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
|
---|
| 229 | zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
|
---|
| 230 | zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
|
---|
| 231 | zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
|
---|
| 232 | zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
|
---|
| 233 | zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
|
---|
| 234 | zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
|
---|
| 235 | zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
|
---|
| 236 | if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
|
---|
| 237 | bb_error_msg_and_die("unsupported compression method %d", zip_header.formatted.method);
|
---|
[821] | 238 | }
|
---|
| 239 |
|
---|
| 240 | /* Read filename */
|
---|
| 241 | free(dst_fn);
|
---|
[1765] | 242 | dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
|
---|
| 243 | xread(src_fd, dst_fn, zip_header.formatted.filename_len);
|
---|
[821] | 244 |
|
---|
| 245 | /* Skip extra header bytes */
|
---|
[1765] | 246 | unzip_skip(src_fd, zip_header.formatted.extra_len);
|
---|
[821] | 247 |
|
---|
| 248 | if ((verbosity == v_list) && !list_header_done){
|
---|
[1765] | 249 | puts(" Length Date Time Name\n"
|
---|
| 250 | " -------- ---- ---- ----");
|
---|
[821] | 251 | list_header_done = 1;
|
---|
| 252 | }
|
---|
| 253 |
|
---|
| 254 | /* Filter zip entries */
|
---|
| 255 | if (find_list_entry(zreject, dst_fn) ||
|
---|
| 256 | (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
|
---|
| 257 | i = 'n';
|
---|
| 258 |
|
---|
| 259 | } else { /* Extract entry */
|
---|
[1765] | 260 | total_size += zip_header.formatted.ucmpsize;
|
---|
[821] | 261 |
|
---|
| 262 | if (verbosity == v_list) { /* List entry */
|
---|
[1765] | 263 | unsigned int dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
|
---|
[821] | 264 | printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
|
---|
[1765] | 265 | zip_header.formatted.ucmpsize,
|
---|
[821] | 266 | (dostime & 0x01e00000) >> 21,
|
---|
| 267 | (dostime & 0x001f0000) >> 16,
|
---|
| 268 | (((dostime & 0xfe000000) >> 25) + 1980) % 100,
|
---|
| 269 | (dostime & 0x0000f800) >> 11,
|
---|
| 270 | (dostime & 0x000007e0) >> 5,
|
---|
| 271 | dst_fn);
|
---|
| 272 | total_entries++;
|
---|
| 273 | i = 'n';
|
---|
| 274 | } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
|
---|
| 275 | i = -1;
|
---|
| 276 | } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
|
---|
| 277 | if (stat(dst_fn, &stat_buf) == -1) {
|
---|
| 278 | if (errno != ENOENT) {
|
---|
[1765] | 279 | bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
|
---|
[821] | 280 | }
|
---|
| 281 | if (verbosity == v_normal) {
|
---|
| 282 | printf(" creating: %s\n", dst_fn);
|
---|
| 283 | }
|
---|
| 284 | unzip_create_leading_dirs(dst_fn);
|
---|
| 285 | if (bb_make_directory(dst_fn, 0777, 0)) {
|
---|
[1765] | 286 | bb_error_msg_and_die("exiting");
|
---|
[821] | 287 | }
|
---|
| 288 | } else {
|
---|
| 289 | if (!S_ISDIR(stat_buf.st_mode)) {
|
---|
| 290 | bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
|
---|
| 291 | }
|
---|
| 292 | }
|
---|
| 293 | i = 'n';
|
---|
| 294 |
|
---|
| 295 | } else { /* Extract file */
|
---|
[1765] | 296 | _check_file:
|
---|
[821] | 297 | if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
|
---|
| 298 | if (errno != ENOENT) {
|
---|
[1765] | 299 | bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
|
---|
[821] | 300 | }
|
---|
| 301 | i = 'y';
|
---|
| 302 | } else { /* File already exists */
|
---|
| 303 | if (overwrite == o_never) {
|
---|
| 304 | i = 'n';
|
---|
| 305 | } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
|
---|
| 306 | if (overwrite == o_always) {
|
---|
| 307 | i = 'y';
|
---|
| 308 | } else {
|
---|
| 309 | printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
|
---|
| 310 | if (!fgets(key_buf, 512, stdin)) {
|
---|
[1765] | 311 | bb_perror_msg_and_die("cannot read input");
|
---|
[821] | 312 | }
|
---|
| 313 | i = key_buf[0];
|
---|
| 314 | }
|
---|
| 315 | } else { /* File is not regular file */
|
---|
| 316 | bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
|
---|
| 317 | }
|
---|
| 318 | }
|
---|
| 319 | }
|
---|
| 320 | }
|
---|
| 321 |
|
---|
| 322 | switch (i) {
|
---|
| 323 | case 'A':
|
---|
| 324 | overwrite = o_always;
|
---|
| 325 | case 'y': /* Open file and fall into unzip */
|
---|
| 326 | unzip_create_leading_dirs(dst_fn);
|
---|
[1765] | 327 | dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
|
---|
[821] | 328 | case -1: /* Unzip */
|
---|
| 329 | if (verbosity == v_normal) {
|
---|
| 330 | printf(" inflating: %s\n", dst_fn);
|
---|
| 331 | }
|
---|
| 332 | if (unzip_extract(&zip_header, src_fd, dst_fd)) {
|
---|
[1765] | 333 | failed = 1;
|
---|
[821] | 334 | }
|
---|
| 335 | if (dst_fd != STDOUT_FILENO) {
|
---|
| 336 | /* closing STDOUT is potentially bad for future business */
|
---|
| 337 | close(dst_fd);
|
---|
| 338 | }
|
---|
| 339 | break;
|
---|
| 340 |
|
---|
| 341 | case 'N':
|
---|
| 342 | overwrite = o_never;
|
---|
| 343 | case 'n':
|
---|
| 344 | /* Skip entry data */
|
---|
[1765] | 345 | unzip_skip(src_fd, zip_header.formatted.cmpsize);
|
---|
[821] | 346 | break;
|
---|
| 347 |
|
---|
| 348 | case 'r':
|
---|
| 349 | /* Prompt for new name */
|
---|
| 350 | printf("new name: ");
|
---|
| 351 | if (!fgets(key_buf, 512, stdin)) {
|
---|
[1765] | 352 | bb_perror_msg_and_die("cannot read input");
|
---|
[821] | 353 | }
|
---|
| 354 | free(dst_fn);
|
---|
[1765] | 355 | dst_fn = xstrdup(key_buf);
|
---|
[821] | 356 | chomp(dst_fn);
|
---|
| 357 | goto _check_file;
|
---|
| 358 |
|
---|
| 359 | default:
|
---|
| 360 | printf("error: invalid response [%c]\n",(char)i);
|
---|
| 361 | goto _check_file;
|
---|
| 362 | }
|
---|
| 363 |
|
---|
| 364 | /* Data descriptor section */
|
---|
[1765] | 365 | if (zip_header.formatted.flags & 4) {
|
---|
[821] | 366 | /* skip over duplicate crc, compressed size and uncompressed size */
|
---|
| 367 | unzip_skip(src_fd, 12);
|
---|
| 368 | }
|
---|
| 369 | }
|
---|
| 370 |
|
---|
| 371 | if (verbosity == v_list) {
|
---|
| 372 | printf(" -------- -------\n"
|
---|
| 373 | "%9d %d files\n", total_size, total_entries);
|
---|
| 374 | }
|
---|
| 375 |
|
---|
| 376 | return failed;
|
---|
| 377 | }
|
---|