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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