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419 lines
11 KiB
C
419 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 <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "unarchive.h"
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#include "busybox.h"
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#if BB_BIG_ENDIAN
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static inline unsigned short
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__swap16(unsigned short x) {
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return (((uint16_t)(x) & 0xFF) << 8) | (((uint16_t)(x) & 0xFF00) >> 8);
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}
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static inline uint32_t
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__swap32(uint32_t x) {
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return (((x & 0xFF) << 24) |
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((x & 0xFF00) << 8) |
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((x & 0xFF0000) >> 8) |
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((x & 0xFF000000) >> 24));
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}
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#else /* it's little-endian */
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# define __swap16(x) (x)
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# define __swap32(x) (x)
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#endif /* BB_BIG_ENDIAN */
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#define ZIP_FILEHEADER_MAGIC __swap32(0x04034b50)
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#define ZIP_CDS_MAGIC __swap32(0x02014b50)
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#define ZIP_CDS_END_MAGIC __swap32(0x06054b50)
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#define ZIP_DD_MAGIC __swap32(0x08074b50)
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extern unsigned int gunzip_crc;
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extern unsigned int gunzip_bytes_out;
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typedef union {
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unsigned char raw[26];
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struct {
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unsigned short version; /* 0-1 */
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unsigned short flags; /* 2-3 */
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unsigned short method; /* 4-5 */
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unsigned short modtime; /* 6-7 */
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unsigned short moddate; /* 8-9 */
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unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
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unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
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unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
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unsigned short filename_len; /* 22-23 */
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unsigned short extra_len; /* 24-25 */
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} formated ATTRIBUTE_PACKED;
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} zip_header_t;
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static void unzip_skip(int fd, off_t skip)
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{
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if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
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if ((errno != ESPIPE) || (bb_copyfd_size(fd, -1, skip) != skip)) {
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bb_error_msg_and_die("Seek failure");
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}
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}
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}
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static void unzip_read(int fd, void *buf, size_t count)
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{
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if (bb_xread(fd, buf, count) != count) {
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bb_error_msg_and_die(bb_msg_read_error);
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}
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}
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static void unzip_create_leading_dirs(char *fn)
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{
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/* Create all leading directories */
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char *name = bb_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 int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
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{
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if (zip_header->formated.method == 0) {
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/* Method 0 - stored (not compressed) */
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int size = zip_header->formated.ucmpsize;
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if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
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bb_error_msg_and_die("Cannot complete extraction");
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}
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} else {
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/* Method 8 - inflate */
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inflate_init(zip_header->formated.cmpsize);
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inflate_unzip(src_fd, dst_fd);
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inflate_cleanup();
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/* Validate decompression - crc */
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if (zip_header->formated.crc32 != (gunzip_crc ^ 0xffffffffL)) {
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bb_error_msg("Invalid compressed data--crc error");
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return 1;
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}
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/* Validate decompression - size */
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if (zip_header->formated.ucmpsize != gunzip_bytes_out) {
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bb_error_msg("Invalid compressed data--length error");
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return 1;
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}
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}
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return 0;
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}
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int unzip_main(int argc, char **argv)
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{
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zip_header_t zip_header;
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enum {v_silent, v_normal, v_list} verbosity = v_normal;
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enum {o_prompt, o_never, o_always} overwrite = o_prompt;
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unsigned int total_size = 0;
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unsigned int total_entries = 0;
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int src_fd = -1, dst_fd = -1;
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char *src_fn = NULL, *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 failed, i, opt, opt_range = 0, list_header_done = 0;
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char key_buf[512];
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struct stat stat_buf;
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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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verbosity = v_list;
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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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verbosity = (verbosity == v_normal) ? v_silent : verbosity;
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break;
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case 1 : /* The zip file */
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src_fn = bb_xstrndup(optarg, strlen(optarg)+4);
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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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} else if (opt == 'd') {
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base_dir = optarg;
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opt_range += 2;
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} else if (opt == 'x') {
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opt_range++;
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} else {
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bb_show_usage();
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}
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break;
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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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} else if (opt == 'd') { /* Extract to base directory */
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base_dir = optarg;
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opt_range++;
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} else {
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bb_show_usage();
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}
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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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}
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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 (strcmp("-", src_fn) == 0) {
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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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overwrite = (overwrite == o_prompt) ? o_never : overwrite;
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} else {
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static const char *const extn[] = {"", ".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("Cannot 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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bb_xchdir(base_dir);
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if (verbosity != v_silent)
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printf("Archive: %s\n", src_fn);
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failed = 0;
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while (1) {
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unsigned int magic;
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/* Check magic number */
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unzip_read(src_fd, &magic, 4);
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if (magic == ZIP_CDS_MAGIC) {
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break;
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} else if (magic != ZIP_FILEHEADER_MAGIC) {
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bb_error_msg_and_die("Invalid zip magic %08X", magic);
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}
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/* Read the file header */
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unzip_read(src_fd, zip_header.raw, 26);
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#if BB_BIG_ENDIAN
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zip_header.formated.version = __swap16(zip_header.formated.version);
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zip_header.formated.flags = __swap16(zip_header.formated.flags);
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zip_header.formated.method = __swap16(zip_header.formated.method);
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zip_header.formated.modtime = __swap16(zip_header.formated.modtime);
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zip_header.formated.moddate = __swap16(zip_header.formated.moddate);
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zip_header.formated.crc32 = __swap32(zip_header.formated.crc32);
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zip_header.formated.cmpsize = __swap32(zip_header.formated.cmpsize);
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zip_header.formated.ucmpsize = __swap32(zip_header.formated.ucmpsize);
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zip_header.formated.filename_len = __swap16(zip_header.formated.filename_len);
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zip_header.formated.extra_len = __swap16(zip_header.formated.extra_len);
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#endif /* BB_BIG_ENDIAN */
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if ((zip_header.formated.method != 0) && (zip_header.formated.method != 8)) {
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bb_error_msg_and_die("Unsupported compression method %d", zip_header.formated.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.formated.filename_len + 1);
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unzip_read(src_fd, dst_fn, zip_header.formated.filename_len);
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/* Skip extra header bytes */
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unzip_skip(src_fd, zip_header.formated.extra_len);
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if ((verbosity == v_list) && !list_header_done){
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printf(" Length Date Time Name\n"
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" -------- ---- ---- ----\n");
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list_header_done = 1;
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}
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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))) { /* Skip entry */
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i = 'n';
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} else { /* Extract entry */
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total_size += zip_header.formated.ucmpsize;
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if (verbosity == v_list) { /* List entry */
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unsigned int dostime = zip_header.formated.modtime | (zip_header.formated.moddate << 16);
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printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
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zip_header.formated.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_entries++;
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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 (verbosity == v_normal) {
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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, 512, 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 = bb_xopen(dst_fn, O_WRONLY | O_CREAT);
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case -1: /* Unzip */
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if (verbosity == v_normal) {
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printf(" inflating: %s\n", dst_fn);
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}
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if (unzip_extract(&zip_header, src_fd, dst_fd)) {
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failed = 1;
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}
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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.formated.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, 512, 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 = bb_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.formated.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 (verbosity == v_list) {
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printf(" -------- -------\n"
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"%9d %d files\n", total_size, total_entries);
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}
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return failed;
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}
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