409 lines
11 KiB
C
409 lines
11 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini unzip implementation for busybox
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*
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* Copyright (C) 2004 by Ed Clark
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*
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* Loosely based on original busybox unzip applet by Laurence Anderson.
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* All options and features should work in this version.
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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/* For reference see
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* http://www.pkware.com/company/standards/appnote/
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* http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
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*/
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/* TODO
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* Endian issues
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* Zip64 + other methods
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* Improve handling of zip format, ie.
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* - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
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* - unix file permissions, etc.
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* - central directory
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*/
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#include "libbb.h"
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#include "unarchive.h"
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enum {
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#if BB_BIG_ENDIAN
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ZIP_FILEHEADER_MAGIC = 0x504b0304,
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ZIP_CDS_MAGIC = 0x504b0102,
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ZIP_CDS_END_MAGIC = 0x504b0506,
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ZIP_DD_MAGIC = 0x504b0708,
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#else
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ZIP_FILEHEADER_MAGIC = 0x04034b50,
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ZIP_CDS_MAGIC = 0x02014b50,
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ZIP_CDS_END_MAGIC = 0x06054b50,
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ZIP_DD_MAGIC = 0x08074b50,
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#endif
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};
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#define ZIP_HEADER_LEN 26
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typedef union {
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uint8_t raw[ZIP_HEADER_LEN];
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struct {
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uint16_t version; /* 0-1 */
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uint16_t flags; /* 2-3 */
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uint16_t method; /* 4-5 */
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uint16_t modtime; /* 6-7 */
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uint16_t moddate; /* 8-9 */
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uint32_t crc32 ATTRIBUTE_PACKED; /* 10-13 */
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uint32_t cmpsize ATTRIBUTE_PACKED; /* 14-17 */
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uint32_t ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
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uint16_t filename_len; /* 22-23 */
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uint16_t extra_len; /* 24-25 */
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} formatted ATTRIBUTE_PACKED;
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} zip_header_t; /* ATTRIBUTE_PACKED - gcc 4.2.1 doesn't like it (spews warning) */
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/* Check the offset of the last element, not the length. This leniency
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* allows for poor packing, whereby the overall struct may be too long,
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* even though the elements are all in the right place.
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*/
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struct BUG_zip_header_must_be_26_bytes {
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char BUG_zip_header_must_be_26_bytes[
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offsetof(zip_header_t, formatted.extra_len) + 2 ==
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ZIP_HEADER_LEN ? 1 : -1];
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};
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#define FIX_ENDIANNESS(zip_header) do { \
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(zip_header).formatted.version = SWAP_LE16((zip_header).formatted.version ); \
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(zip_header).formatted.flags = SWAP_LE16((zip_header).formatted.flags ); \
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(zip_header).formatted.method = SWAP_LE16((zip_header).formatted.method ); \
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(zip_header).formatted.modtime = SWAP_LE16((zip_header).formatted.modtime ); \
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(zip_header).formatted.moddate = SWAP_LE16((zip_header).formatted.moddate ); \
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(zip_header).formatted.crc32 = SWAP_LE32((zip_header).formatted.crc32 ); \
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(zip_header).formatted.cmpsize = SWAP_LE32((zip_header).formatted.cmpsize ); \
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(zip_header).formatted.ucmpsize = SWAP_LE32((zip_header).formatted.ucmpsize ); \
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(zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
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(zip_header).formatted.extra_len = SWAP_LE16((zip_header).formatted.extra_len ); \
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} while (0)
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static void unzip_skip(int fd, off_t skip)
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{
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bb_copyfd_exact_size(fd, -1, skip);
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}
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static void unzip_create_leading_dirs(const char *fn)
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{
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/* Create all leading directories */
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char *name = xstrdup(fn);
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if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
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bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
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}
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free(name);
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}
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static void unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
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{
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if (zip_header->formatted.method == 0) {
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/* Method 0 - stored (not compressed) */
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off_t size = zip_header->formatted.ucmpsize;
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if (size)
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bb_copyfd_exact_size(src_fd, dst_fd, size);
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} else {
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/* Method 8 - inflate */
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inflate_unzip_result res;
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if (inflate_unzip(&res, zip_header->formatted.cmpsize, src_fd, dst_fd) < 0)
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bb_error_msg_and_die("inflate error");
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/* Validate decompression - crc */
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if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
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bb_error_msg_and_die("crc error");
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}
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/* Validate decompression - size */
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if (zip_header->formatted.ucmpsize != res.bytes_out) {
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/* Don't die. Who knows, maybe len calculation
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* was botched somewhere. After all, crc matched! */
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bb_error_msg("bad length");
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}
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}
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}
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int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int unzip_main(int argc, char **argv)
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{
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enum { O_PROMPT, O_NEVER, O_ALWAYS };
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zip_header_t zip_header;
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smallint verbose = 1;
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smallint listing = 0;
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smallint overwrite = O_PROMPT;
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unsigned total_size;
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unsigned total_entries;
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int src_fd = -1;
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int dst_fd = -1;
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char *src_fn = NULL;
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char *dst_fn = NULL;
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llist_t *zaccept = NULL;
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llist_t *zreject = NULL;
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char *base_dir = NULL;
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int i, opt;
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int opt_range = 0;
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char key_buf[80];
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struct stat stat_buf;
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/* '-' makes getopt return 1 for non-options */
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while ((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
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switch (opt_range) {
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case 0: /* Options */
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switch (opt) {
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case 'l': /* List */
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listing = 1;
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break;
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case 'n': /* Never overwrite existing files */
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overwrite = O_NEVER;
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break;
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case 'o': /* Always overwrite existing files */
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overwrite = O_ALWAYS;
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break;
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case 'p': /* Extract files to stdout and fall through to set verbosity */
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dst_fd = STDOUT_FILENO;
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case 'q': /* Be quiet */
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verbose = 0;
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break;
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case 1: /* The zip file */
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/* +5: space for ".zip" and NUL */
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src_fn = xmalloc(strlen(optarg) + 5);
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strcpy(src_fn, optarg);
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opt_range++;
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break;
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default:
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bb_show_usage();
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}
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break;
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case 1: /* Include files */
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if (opt == 1) {
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llist_add_to(&zaccept, optarg);
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break;
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}
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if (opt == 'd') {
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base_dir = optarg;
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opt_range += 2;
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break;
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}
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if (opt == 'x') {
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opt_range++;
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break;
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}
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bb_show_usage();
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case 2 : /* Exclude files */
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if (opt == 1) {
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llist_add_to(&zreject, optarg);
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break;
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}
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if (opt == 'd') { /* Extract to base directory */
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base_dir = optarg;
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opt_range++;
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break;
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}
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/* fall through */
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default:
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bb_show_usage();
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}
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}
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if (src_fn == NULL) {
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bb_show_usage();
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}
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/* Open input file */
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if (LONE_DASH(src_fn)) {
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src_fd = STDIN_FILENO;
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/* Cannot use prompt mode since zip data is arriving on STDIN */
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if (overwrite == O_PROMPT)
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overwrite = O_NEVER;
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} else {
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static const char extn[][5] = {"", ".zip", ".ZIP"};
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int orig_src_fn_len = strlen(src_fn);
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for (i = 0; (i < 3) && (src_fd == -1); i++) {
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strcpy(src_fn + orig_src_fn_len, extn[i]);
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src_fd = open(src_fn, O_RDONLY);
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}
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if (src_fd == -1) {
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src_fn[orig_src_fn_len] = '\0';
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bb_error_msg_and_die("can't open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
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}
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}
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/* Change dir if necessary */
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if (base_dir)
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xchdir(base_dir);
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if (verbose) {
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printf("Archive: %s\n", src_fn);
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if (listing){
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puts(" Length Date Time Name\n"
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" -------- ---- ---- ----");
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}
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}
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total_size = 0;
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total_entries = 0;
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while (1) {
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uint32_t magic;
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/* Check magic number */
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xread(src_fd, &magic, 4);
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if (magic == ZIP_CDS_MAGIC)
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break;
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if (magic != ZIP_FILEHEADER_MAGIC)
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bb_error_msg_and_die("invalid zip magic %08X", magic);
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/* Read the file header */
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xread(src_fd, zip_header.raw, ZIP_HEADER_LEN);
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FIX_ENDIANNESS(zip_header);
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if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
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bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
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}
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/* Read filename */
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free(dst_fn);
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dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
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xread(src_fd, dst_fn, zip_header.formatted.filename_len);
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/* Skip extra header bytes */
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unzip_skip(src_fd, zip_header.formatted.extra_len);
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/* Filter zip entries */
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if (find_list_entry(zreject, dst_fn)
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|| (zaccept && !find_list_entry(zaccept, dst_fn))
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) { /* Skip entry */
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i = 'n';
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} else { /* Extract entry */
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if (listing) { /* List entry */
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if (verbose) {
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unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
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printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
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zip_header.formatted.ucmpsize,
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(dostime & 0x01e00000) >> 21,
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(dostime & 0x001f0000) >> 16,
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(((dostime & 0xfe000000) >> 25) + 1980) % 100,
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(dostime & 0x0000f800) >> 11,
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(dostime & 0x000007e0) >> 5,
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dst_fn);
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total_size += zip_header.formatted.ucmpsize;
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total_entries++;
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} else {
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/* short listing -- filenames only */
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puts(dst_fn);
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}
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i = 'n';
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} else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
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i = -1;
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} else if (last_char_is(dst_fn, '/')) { /* Extract directory */
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if (stat(dst_fn, &stat_buf) == -1) {
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if (errno != ENOENT) {
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bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
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}
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if (verbose) {
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printf(" creating: %s\n", dst_fn);
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}
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unzip_create_leading_dirs(dst_fn);
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if (bb_make_directory(dst_fn, 0777, 0)) {
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bb_error_msg_and_die("exiting");
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}
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} else {
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if (!S_ISDIR(stat_buf.st_mode)) {
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bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
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}
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}
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i = 'n';
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} else { /* Extract file */
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_check_file:
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if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
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if (errno != ENOENT) {
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bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
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}
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i = 'y';
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} else { /* File already exists */
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if (overwrite == O_NEVER) {
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i = 'n';
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} else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
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if (overwrite == O_ALWAYS) {
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i = 'y';
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} else {
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printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
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if (!fgets(key_buf, sizeof(key_buf), stdin)) {
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bb_perror_msg_and_die("cannot read input");
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}
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i = key_buf[0];
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}
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} else { /* File is not regular file */
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bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
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}
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}
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}
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}
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switch (i) {
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case 'A':
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overwrite = O_ALWAYS;
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case 'y': /* Open file and fall into unzip */
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unzip_create_leading_dirs(dst_fn);
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dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
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case -1: /* Unzip */
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if (verbose) {
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printf(" inflating: %s\n", dst_fn);
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}
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unzip_extract(&zip_header, src_fd, dst_fd);
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if (dst_fd != STDOUT_FILENO) {
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/* closing STDOUT is potentially bad for future business */
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close(dst_fd);
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}
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break;
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case 'N':
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overwrite = O_NEVER;
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case 'n':
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/* Skip entry data */
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unzip_skip(src_fd, zip_header.formatted.cmpsize);
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break;
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case 'r':
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/* Prompt for new name */
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printf("new name: ");
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if (!fgets(key_buf, sizeof(key_buf), stdin)) {
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bb_perror_msg_and_die("cannot read input");
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}
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free(dst_fn);
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dst_fn = xstrdup(key_buf);
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chomp(dst_fn);
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goto _check_file;
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default:
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printf("error: invalid response [%c]\n",(char)i);
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goto _check_file;
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}
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/* Data descriptor section */
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if (zip_header.formatted.flags & 4) {
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/* skip over duplicate crc, compressed size and uncompressed size */
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unzip_skip(src_fd, 12);
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}
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}
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if (listing && verbose) {
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printf(" -------- -------\n"
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"%9d %d files\n",
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total_size, total_entries);
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}
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return 0;
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}
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