[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini unzip implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2004 by Ed Clark
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| 6 | *
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| 7 | * Loosely based on original busybox unzip applet by Laurence Anderson.
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| 8 | * All options and features should work in this version.
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| 9 | *
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| 10 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 11 | */
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| 12 |
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| 13 | /* For reference see
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| 14 | * http://www.pkware.com/company/standards/appnote/
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| 15 | * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
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| 16 | */
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| 17 |
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| 18 | /* TODO
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| 19 | * Endian issues
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| 20 | * Zip64 + other methods
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| 21 | * Improve handling of zip format, ie.
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| 22 | * - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
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| 23 | * - unix file permissions, etc.
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| 24 | * - central directory
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| 25 | */
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| 26 |
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| 27 | #include <fcntl.h>
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| 28 | #include <stdlib.h>
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| 29 | #include <string.h>
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| 30 | #include <unistd.h>
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| 31 | #include <errno.h>
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| 32 | #include "unarchive.h"
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| 33 | #include "busybox.h"
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| 34 |
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| 35 | #if BB_BIG_ENDIAN
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| 36 | static inline unsigned short
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| 37 | __swap16(unsigned short x) {
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| 38 | return (((uint16_t)(x) & 0xFF) << 8) | (((uint16_t)(x) & 0xFF00) >> 8);
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| 39 | }
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| 40 |
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| 41 | static inline uint32_t
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| 42 | __swap32(uint32_t x) {
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| 43 | return (((x & 0xFF) << 24) |
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| 44 | ((x & 0xFF00) << 8) |
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| 45 | ((x & 0xFF0000) >> 8) |
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| 46 | ((x & 0xFF000000) >> 24));
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| 47 | }
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| 48 | #else /* it's little-endian */
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| 49 | # define __swap16(x) (x)
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| 50 | # define __swap32(x) (x)
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| 51 | #endif /* BB_BIG_ENDIAN */
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| 52 |
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| 53 | #define ZIP_FILEHEADER_MAGIC __swap32(0x04034b50)
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| 54 | #define ZIP_CDS_MAGIC __swap32(0x02014b50)
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| 55 | #define ZIP_CDS_END_MAGIC __swap32(0x06054b50)
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| 56 | #define ZIP_DD_MAGIC __swap32(0x08074b50)
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| 57 |
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| 58 | extern unsigned int gunzip_crc;
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| 59 | extern unsigned int gunzip_bytes_out;
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| 60 |
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| 61 | typedef union {
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| 62 | unsigned char raw[26];
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| 63 | struct {
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| 64 | unsigned short version; /* 0-1 */
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| 65 | unsigned short flags; /* 2-3 */
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| 66 | unsigned short method; /* 4-5 */
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| 67 | unsigned short modtime; /* 6-7 */
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| 68 | unsigned short moddate; /* 8-9 */
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| 69 | unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
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| 70 | unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
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| 71 | unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
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| 72 | unsigned short filename_len; /* 22-23 */
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| 73 | unsigned short extra_len; /* 24-25 */
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| 74 | } formated ATTRIBUTE_PACKED;
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| 75 | } zip_header_t;
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| 76 |
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| 77 | static void unzip_skip(int fd, off_t skip)
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| 78 | {
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| 79 | if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
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| 80 | if ((errno != ESPIPE) || (bb_copyfd_size(fd, -1, skip) != skip)) {
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| 81 | bb_error_msg_and_die("Seek failure");
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| 82 | }
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| 83 | }
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| 84 | }
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| 85 |
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| 86 | static void unzip_read(int fd, void *buf, size_t count)
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| 87 | {
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| 88 | if (bb_xread(fd, buf, count) != count) {
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| 89 | bb_error_msg_and_die(bb_msg_read_error);
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| 90 | }
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| 91 | }
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| 92 |
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| 93 | static void unzip_create_leading_dirs(char *fn)
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| 94 | {
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| 95 | /* Create all leading directories */
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| 96 | char *name = bb_xstrdup(fn);
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| 97 | if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
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| 98 | bb_error_msg_and_die("Exiting"); /* bb_make_directory is noisy */
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| 99 | }
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| 100 | free(name);
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| 101 | }
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| 102 |
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| 103 | static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
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| 104 | {
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| 105 | if (zip_header->formated.method == 0) {
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| 106 | /* Method 0 - stored (not compressed) */
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| 107 | int size = zip_header->formated.ucmpsize;
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| 108 | if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
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| 109 | bb_error_msg_and_die("Cannot complete extraction");
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| 110 | }
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| 111 |
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| 112 | } else {
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| 113 | /* Method 8 - inflate */
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| 114 | inflate_init(zip_header->formated.cmpsize);
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| 115 | inflate_unzip(src_fd, dst_fd);
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| 116 | inflate_cleanup();
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| 117 | /* Validate decompression - crc */
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| 118 | if (zip_header->formated.crc32 != (gunzip_crc ^ 0xffffffffL)) {
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| 119 | bb_error_msg("Invalid compressed data--crc error");
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| 120 | return 1;
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| 121 | }
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| 122 | /* Validate decompression - size */
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| 123 | if (zip_header->formated.ucmpsize != gunzip_bytes_out) {
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| 124 | bb_error_msg("Invalid compressed data--length error");
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| 125 | return 1;
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| 126 | }
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| 127 | }
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| 128 | return 0;
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| 129 | }
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| 130 |
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| 131 | int unzip_main(int argc, char **argv)
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| 132 | {
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| 133 | zip_header_t zip_header;
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| 134 | enum {v_silent, v_normal, v_list} verbosity = v_normal;
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| 135 | enum {o_prompt, o_never, o_always} overwrite = o_prompt;
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| 136 | unsigned int total_size = 0;
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| 137 | unsigned int total_entries = 0;
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| 138 | int src_fd = -1, dst_fd = -1;
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| 139 | char *src_fn = NULL, *dst_fn = NULL;
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| 140 | llist_t *zaccept = NULL;
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| 141 | llist_t *zreject = NULL;
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| 142 | char *base_dir = NULL;
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| 143 | int failed, i, opt, opt_range = 0, list_header_done = 0;
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| 144 | char key_buf[512];
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| 145 | struct stat stat_buf;
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| 146 |
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| 147 | while((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
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| 148 | switch(opt_range) {
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| 149 | case 0: /* Options */
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| 150 | switch(opt) {
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| 151 | case 'l': /* List */
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| 152 | verbosity = v_list;
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| 153 | break;
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| 154 |
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| 155 | case 'n': /* Never overwrite existing files */
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| 156 | overwrite = o_never;
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| 157 | break;
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| 158 |
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| 159 | case 'o': /* Always overwrite existing files */
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| 160 | overwrite = o_always;
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| 161 | break;
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| 162 |
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| 163 | case 'p': /* Extract files to stdout and fall through to set verbosity */
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| 164 | dst_fd = STDOUT_FILENO;
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| 165 |
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| 166 | case 'q': /* Be quiet */
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| 167 | verbosity = (verbosity == v_normal) ? v_silent : verbosity;
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| 168 | break;
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| 169 |
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| 170 | case 1 : /* The zip file */
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| 171 | src_fn = bb_xstrndup(optarg, strlen(optarg)+4);
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| 172 | opt_range++;
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| 173 | break;
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| 174 |
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| 175 | default:
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| 176 | bb_show_usage();
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| 177 |
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| 178 | }
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| 179 | break;
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| 180 |
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| 181 | case 1: /* Include files */
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| 182 | if (opt == 1) {
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| 183 | llist_add_to(&zaccept, optarg);
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| 184 |
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| 185 | } else if (opt == 'd') {
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| 186 | base_dir = optarg;
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| 187 | opt_range += 2;
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| 188 |
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| 189 | } else if (opt == 'x') {
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| 190 | opt_range++;
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| 191 |
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| 192 | } else {
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| 193 | bb_show_usage();
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| 194 | }
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| 195 | break;
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| 196 |
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| 197 | case 2 : /* Exclude files */
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| 198 | if (opt == 1) {
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| 199 | llist_add_to(&zreject, optarg);
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| 200 |
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| 201 | } else if (opt == 'd') { /* Extract to base directory */
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| 202 | base_dir = optarg;
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| 203 | opt_range++;
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| 204 |
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| 205 | } else {
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| 206 | bb_show_usage();
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| 207 | }
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| 208 | break;
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| 209 |
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| 210 | default:
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| 211 | bb_show_usage();
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| 212 | }
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| 213 | }
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| 214 |
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| 215 | if (src_fn == NULL) {
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| 216 | bb_show_usage();
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| 217 | }
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| 218 |
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| 219 | /* Open input file */
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| 220 | if (strcmp("-", src_fn) == 0) {
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| 221 | src_fd = STDIN_FILENO;
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| 222 | /* Cannot use prompt mode since zip data is arriving on STDIN */
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| 223 | overwrite = (overwrite == o_prompt) ? o_never : overwrite;
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| 224 |
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| 225 | } else {
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| 226 | static const char *const extn[] = {"", ".zip", ".ZIP"};
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| 227 | int orig_src_fn_len = strlen(src_fn);
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| 228 | for(i = 0; (i < 3) && (src_fd == -1); i++) {
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| 229 | strcpy(src_fn + orig_src_fn_len, extn[i]);
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| 230 | src_fd = open(src_fn, O_RDONLY);
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| 231 | }
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| 232 | if (src_fd == -1) {
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| 233 | src_fn[orig_src_fn_len] = 0;
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| 234 | bb_error_msg_and_die("Cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
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| 235 | }
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| 236 | }
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| 237 |
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| 238 | /* Change dir if necessary */
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| 239 | if (base_dir)
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| 240 | bb_xchdir(base_dir);
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| 241 |
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| 242 | if (verbosity != v_silent)
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| 243 | printf("Archive: %s\n", src_fn);
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| 244 |
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| 245 | failed = 0;
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| 246 |
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| 247 | while (1) {
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| 248 | unsigned int magic;
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| 249 |
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| 250 | /* Check magic number */
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| 251 | unzip_read(src_fd, &magic, 4);
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| 252 | if (magic == ZIP_CDS_MAGIC) {
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| 253 | break;
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| 254 | } else if (magic != ZIP_FILEHEADER_MAGIC) {
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| 255 | bb_error_msg_and_die("Invalid zip magic %08X", magic);
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| 256 | }
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| 257 |
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| 258 | /* Read the file header */
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| 259 | unzip_read(src_fd, zip_header.raw, 26);
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| 260 | #if BB_BIG_ENDIAN
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| 261 | zip_header.formated.version = __swap16(zip_header.formated.version);
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| 262 | zip_header.formated.flags = __swap16(zip_header.formated.flags);
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| 263 | zip_header.formated.method = __swap16(zip_header.formated.method);
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| 264 | zip_header.formated.modtime = __swap16(zip_header.formated.modtime);
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| 265 | zip_header.formated.moddate = __swap16(zip_header.formated.moddate);
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| 266 | zip_header.formated.crc32 = __swap32(zip_header.formated.crc32);
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| 267 | zip_header.formated.cmpsize = __swap32(zip_header.formated.cmpsize);
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| 268 | zip_header.formated.ucmpsize = __swap32(zip_header.formated.ucmpsize);
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| 269 | zip_header.formated.filename_len = __swap16(zip_header.formated.filename_len);
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| 270 | zip_header.formated.extra_len = __swap16(zip_header.formated.extra_len);
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| 271 | #endif /* BB_BIG_ENDIAN */
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| 272 | if ((zip_header.formated.method != 0) && (zip_header.formated.method != 8)) {
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| 273 | bb_error_msg_and_die("Unsupported compression method %d", zip_header.formated.method);
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| 274 | }
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| 275 |
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| 276 | /* Read filename */
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| 277 | free(dst_fn);
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| 278 | dst_fn = xzalloc(zip_header.formated.filename_len + 1);
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| 279 | unzip_read(src_fd, dst_fn, zip_header.formated.filename_len);
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| 280 |
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| 281 | /* Skip extra header bytes */
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| 282 | unzip_skip(src_fd, zip_header.formated.extra_len);
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| 283 |
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| 284 | if ((verbosity == v_list) && !list_header_done){
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| 285 | printf(" Length Date Time Name\n"
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| 286 | " -------- ---- ---- ----\n");
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| 287 | list_header_done = 1;
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| 288 | }
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| 289 |
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| 290 | /* Filter zip entries */
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| 291 | if (find_list_entry(zreject, dst_fn) ||
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| 292 | (zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
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| 293 | i = 'n';
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| 294 |
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| 295 | } else { /* Extract entry */
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| 296 | total_size += zip_header.formated.ucmpsize;
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| 297 |
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| 298 | if (verbosity == v_list) { /* List entry */
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| 299 | unsigned int dostime = zip_header.formated.modtime | (zip_header.formated.moddate << 16);
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| 300 | printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
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| 301 | zip_header.formated.ucmpsize,
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| 302 | (dostime & 0x01e00000) >> 21,
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| 303 | (dostime & 0x001f0000) >> 16,
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| 304 | (((dostime & 0xfe000000) >> 25) + 1980) % 100,
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| 305 | (dostime & 0x0000f800) >> 11,
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| 306 | (dostime & 0x000007e0) >> 5,
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| 307 | dst_fn);
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| 308 | total_entries++;
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| 309 | i = 'n';
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| 310 |
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| 311 | } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
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| 312 | i = -1;
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| 313 |
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| 314 | } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
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| 315 | if (stat(dst_fn, &stat_buf) == -1) {
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| 316 | if (errno != ENOENT) {
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| 317 | bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
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| 318 | }
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| 319 | if (verbosity == v_normal) {
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| 320 | printf(" creating: %s\n", dst_fn);
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| 321 | }
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| 322 | unzip_create_leading_dirs(dst_fn);
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| 323 | if (bb_make_directory(dst_fn, 0777, 0)) {
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| 324 | bb_error_msg_and_die("Exiting");
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| 325 | }
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| 326 | } else {
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| 327 | if (!S_ISDIR(stat_buf.st_mode)) {
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| 328 | bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
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| 329 | }
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| 330 | }
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| 331 | i = 'n';
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| 332 |
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| 333 | } else { /* Extract file */
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| 334 | _check_file:
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| 335 | if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
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| 336 | if (errno != ENOENT) {
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| 337 | bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
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| 338 | }
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| 339 | i = 'y';
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| 340 |
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| 341 | } else { /* File already exists */
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| 342 | if (overwrite == o_never) {
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| 343 | i = 'n';
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| 344 |
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| 345 | } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
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| 346 | if (overwrite == o_always) {
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| 347 | i = 'y';
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| 348 | } else {
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| 349 | printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
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| 350 | if (!fgets(key_buf, 512, stdin)) {
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| 351 | bb_perror_msg_and_die("Cannot read input");
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| 352 | }
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| 353 | i = key_buf[0];
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| 354 | }
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| 355 |
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| 356 | } else { /* File is not regular file */
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| 357 | bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
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| 358 | }
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| 359 | }
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| 360 | }
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| 361 | }
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| 362 |
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| 363 | switch (i) {
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| 364 | case 'A':
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| 365 | overwrite = o_always;
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| 366 | case 'y': /* Open file and fall into unzip */
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| 367 | unzip_create_leading_dirs(dst_fn);
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| 368 | dst_fd = bb_xopen(dst_fn, O_WRONLY | O_CREAT);
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| 369 | case -1: /* Unzip */
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| 370 | if (verbosity == v_normal) {
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| 371 | printf(" inflating: %s\n", dst_fn);
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| 372 | }
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| 373 | if (unzip_extract(&zip_header, src_fd, dst_fd)) {
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| 374 | failed = 1;
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| 375 | }
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| 376 | if (dst_fd != STDOUT_FILENO) {
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| 377 | /* closing STDOUT is potentially bad for future business */
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| 378 | close(dst_fd);
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| 379 | }
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| 380 | break;
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| 381 |
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| 382 | case 'N':
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| 383 | overwrite = o_never;
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| 384 | case 'n':
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| 385 | /* Skip entry data */
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| 386 | unzip_skip(src_fd, zip_header.formated.cmpsize);
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| 387 | break;
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| 388 |
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| 389 | case 'r':
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| 390 | /* Prompt for new name */
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| 391 | printf("new name: ");
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| 392 | if (!fgets(key_buf, 512, stdin)) {
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| 393 | bb_perror_msg_and_die("Cannot read input");
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| 394 | }
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| 395 | free(dst_fn);
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| 396 | dst_fn = bb_xstrdup(key_buf);
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| 397 | chomp(dst_fn);
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| 398 | goto _check_file;
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| 399 |
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| 400 | default:
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| 401 | printf("error: invalid response [%c]\n",(char)i);
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| 402 | goto _check_file;
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| 403 | }
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| 404 |
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| 405 | /* Data descriptor section */
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| 406 | if (zip_header.formated.flags & 4) {
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| 407 | /* skip over duplicate crc, compressed size and uncompressed size */
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| 408 | unzip_skip(src_fd, 12);
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| 409 | }
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| 410 | }
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| 411 |
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| 412 | if (verbosity == v_list) {
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| 413 | printf(" -------- -------\n"
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| 414 | "%9d %d files\n", total_size, total_entries);
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| 415 | }
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| 416 |
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| 417 | return failed;
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| 418 | }
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