1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini cpio implementation for busybox
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4 | *
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5 | * Copyright (C) 2001 by Glenn McGrath
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | *
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9 | * Limitations:
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10 | * Doesn't check CRC's
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11 | * Only supports new ASCII and CRC formats
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12 | *
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13 | */
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14 | #include "libbb.h"
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15 | #include "bb_archive.h"
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16 |
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17 | //usage:#define cpio_trivial_usage
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18 | //usage: "[-dmvu] [-F FILE]" IF_FEATURE_CPIO_O(" [-H newc]")
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19 | //usage: " [-ti"IF_FEATURE_CPIO_O("o")"]" IF_FEATURE_CPIO_P(" [-p DIR]")
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20 | //usage: " [EXTR_FILE]..."
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21 | //usage:#define cpio_full_usage "\n\n"
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22 | //usage: "Extract or list files from a cpio archive"
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23 | //usage: IF_FEATURE_CPIO_O(", or"
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24 | //usage: "\ncreate an archive" IF_FEATURE_CPIO_P(" (-o) or copy files (-p)")
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25 | //usage: " using file list on stdin"
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26 | //usage: )
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27 | //usage: "\n"
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28 | //usage: "\nMain operation mode:"
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29 | //usage: "\n -t List"
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30 | //usage: "\n -i Extract EXTR_FILEs (or all)"
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31 | //usage: IF_FEATURE_CPIO_O(
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32 | //usage: "\n -o Create (requires -H newc)"
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33 | //usage: )
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34 | //usage: IF_FEATURE_CPIO_P(
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35 | //usage: "\n -p DIR Copy files to DIR"
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36 | //usage: )
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37 | //usage: "\n -d Make leading directories"
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38 | //usage: "\n -m Preserve mtime"
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39 | //usage: "\n -v Verbose"
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40 | //usage: "\n -u Overwrite"
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41 | //usage: "\n -F FILE Input (-t,-i,-p) or output (-o) file"
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42 | //usage: IF_FEATURE_CPIO_O(
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43 | //usage: "\n -H newc Archive format"
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44 | //usage: )
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45 |
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46 | /* GNU cpio 2.9 --help (abridged):
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47 |
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48 | Modes:
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49 | -t, --list List the archive
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50 | -i, --extract Extract files from an archive
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51 | -o, --create Create the archive
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52 | -p, --pass-through Copy-pass mode
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53 |
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54 | Options valid in any mode:
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55 | --block-size=SIZE I/O block size = SIZE * 512 bytes
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56 | -B I/O block size = 5120 bytes
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57 | -c Use the old portable (ASCII) archive format
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58 | -C, --io-size=NUMBER I/O block size in bytes
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59 | -f, --nonmatching Only copy files that do not match given pattern
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60 | -F, --file=FILE Use FILE instead of standard input or output
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61 | -H, --format=FORMAT Use given archive FORMAT
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62 | -M, --message=STRING Print STRING when the end of a volume of the
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63 | backup media is reached
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64 | -n, --numeric-uid-gid If -v, show numeric UID and GID
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65 | --quiet Do not print the number of blocks copied
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66 | --rsh-command=COMMAND Use remote COMMAND instead of rsh
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67 | -v, --verbose Verbosely list the files processed
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68 | -V, --dot Print a "." for each file processed
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69 | -W, --warning=FLAG Control warning display: 'none','truncate','all';
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70 | multiple options accumulate
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71 |
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72 | Options valid only in --extract mode:
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73 | -b, --swap Swap both halfwords of words and bytes of
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74 | halfwords in the data (equivalent to -sS)
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75 | -r, --rename Interactively rename files
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76 | -s, --swap-bytes Swap the bytes of each halfword in the files
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77 | -S, --swap-halfwords Swap the halfwords of each word (4 bytes)
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78 | --to-stdout Extract files to standard output
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79 | -E, --pattern-file=FILE Read additional patterns specifying filenames to
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80 | extract or list from FILE
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81 | --only-verify-crc Verify CRC's, don't actually extract the files
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82 |
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83 | Options valid only in --create mode:
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84 | -A, --append Append to an existing archive
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85 | -O FILE File to use instead of standard output
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86 |
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87 | Options valid only in --pass-through mode:
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88 | -l, --link Link files instead of copying them, when possible
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89 |
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90 | Options valid in --extract and --create modes:
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91 | --absolute-filenames Do not strip file system prefix components from
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92 | the file names
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93 | --no-absolute-filenames Create all files relative to the current dir
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94 |
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95 | Options valid in --create and --pass-through modes:
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96 | -0, --null A list of filenames is terminated by a NUL
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97 | -a, --reset-access-time Reset the access times of files after reading them
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98 | -I FILE File to use instead of standard input
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99 | -L, --dereference Dereference symbolic links (copy the files
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100 | that they point to instead of copying the links)
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101 | -R, --owner=[USER][:.][GROUP] Set owner of created files
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102 |
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103 | Options valid in --extract and --pass-through modes:
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104 | -d, --make-directories Create leading directories where needed
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105 | -m, --preserve-modification-time Retain mtime when creating files
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106 | --no-preserve-owner Do not change the ownership of the files
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107 | --sparse Write files with blocks of zeros as sparse files
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108 | -u, --unconditional Replace all files unconditionally
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109 | */
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110 |
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111 | enum {
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112 | OPT_EXTRACT = (1 << 0),
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113 | OPT_TEST = (1 << 1),
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114 | OPT_NUL_TERMINATED = (1 << 2),
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115 | OPT_UNCONDITIONAL = (1 << 3),
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116 | OPT_VERBOSE = (1 << 4),
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117 | OPT_CREATE_LEADING_DIR = (1 << 5),
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118 | OPT_PRESERVE_MTIME = (1 << 6),
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119 | OPT_DEREF = (1 << 7),
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120 | OPT_FILE = (1 << 8),
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121 | OPTBIT_FILE = 8,
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122 | IF_FEATURE_CPIO_O(OPTBIT_CREATE ,)
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123 | IF_FEATURE_CPIO_O(OPTBIT_FORMAT ,)
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124 | IF_FEATURE_CPIO_P(OPTBIT_PASSTHROUGH,)
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125 | IF_LONG_OPTS( OPTBIT_QUIET ,)
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126 | IF_LONG_OPTS( OPTBIT_2STDOUT ,)
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127 | OPT_CREATE = IF_FEATURE_CPIO_O((1 << OPTBIT_CREATE )) + 0,
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128 | OPT_FORMAT = IF_FEATURE_CPIO_O((1 << OPTBIT_FORMAT )) + 0,
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129 | OPT_PASSTHROUGH = IF_FEATURE_CPIO_P((1 << OPTBIT_PASSTHROUGH)) + 0,
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130 | OPT_QUIET = IF_LONG_OPTS( (1 << OPTBIT_QUIET )) + 0,
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131 | OPT_2STDOUT = IF_LONG_OPTS( (1 << OPTBIT_2STDOUT )) + 0,
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132 | };
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133 |
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134 | #define OPTION_STR "it0uvdmLF:"
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135 |
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136 | #if ENABLE_FEATURE_CPIO_O
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137 | static off_t cpio_pad4(off_t size)
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138 | {
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139 | int i;
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140 |
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141 | i = (- size) & 3;
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142 | size += i;
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143 | while (--i >= 0)
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144 | bb_putchar('\0');
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145 | return size;
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146 | }
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147 |
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148 | /* Return value will become exit code.
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149 | * It's ok to exit instead of return. */
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150 | static NOINLINE int cpio_o(void)
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151 | {
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152 | static const char trailer[] ALIGN1 = "TRAILER!!!";
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153 | struct name_s {
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154 | struct name_s *next;
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155 | char name[1];
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156 | };
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157 | struct inodes_s {
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158 | struct inodes_s *next;
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159 | struct name_s *names;
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160 | struct stat st;
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161 | };
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162 |
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163 | struct inodes_s *links = NULL;
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164 | off_t bytes = 0; /* output bytes count */
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165 |
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166 | while (1) {
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167 | const char *name;
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168 | char *line;
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169 | struct stat st;
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170 |
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171 | line = (option_mask32 & OPT_NUL_TERMINATED)
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172 | ? bb_get_chunk_from_file(stdin, NULL)
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173 | : xmalloc_fgetline(stdin);
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174 |
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175 | if (line) {
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176 | /* Strip leading "./[./]..." from the filename */
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177 | name = line;
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178 | while (name[0] == '.' && name[1] == '/') {
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179 | while (*++name == '/')
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180 | continue;
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181 | }
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182 | if (!*name) { /* line is empty */
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183 | free(line);
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184 | continue;
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185 | }
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186 | if ((option_mask32 & OPT_DEREF)
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187 | ? stat(name, &st)
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188 | : lstat(name, &st)
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189 | ) {
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190 | abort_cpio_o:
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191 | bb_simple_perror_msg_and_die(name);
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192 | }
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193 |
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194 | if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
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195 | st.st_size = 0; /* paranoia */
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196 |
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197 | /* Store hardlinks for later processing, dont output them */
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198 | if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
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199 | struct name_s *n;
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200 | struct inodes_s *l;
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201 |
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202 | /* Do we have this hardlink remembered? */
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203 | l = links;
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204 | while (1) {
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205 | if (l == NULL) {
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206 | /* Not found: add new item to "links" list */
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207 | l = xzalloc(sizeof(*l));
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208 | l->st = st;
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209 | l->next = links;
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210 | links = l;
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211 | break;
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212 | }
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213 | if (l->st.st_ino == st.st_ino) {
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214 | /* found */
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215 | break;
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216 | }
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217 | l = l->next;
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218 | }
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219 | /* Add new name to "l->names" list */
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220 | n = xmalloc(sizeof(*n) + strlen(name));
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221 | strcpy(n->name, name);
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222 | n->next = l->names;
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223 | l->names = n;
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224 |
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225 | free(line);
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226 | continue;
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227 | }
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228 |
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229 | } else { /* line == NULL: EOF */
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230 | next_link:
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231 | if (links) {
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232 | /* Output hardlink's data */
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233 | st = links->st;
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234 | name = links->names->name;
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235 | links->names = links->names->next;
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236 | /* GNU cpio is reported to emit file data
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237 | * only for the last instance. Mimic that. */
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238 | if (links->names == NULL)
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239 | links = links->next;
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240 | else
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241 | st.st_size = 0;
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242 | /* NB: we leak links->names and/or links,
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243 | * this is intended (we exit soon anyway) */
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244 | } else {
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245 | /* If no (more) hardlinks to output,
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246 | * output "trailer" entry */
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247 | name = trailer;
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248 | /* st.st_size == 0 is a must, but for uniformity
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249 | * in the output, we zero out everything */
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250 | memset(&st, 0, sizeof(st));
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251 | /* st.st_nlink = 1; - GNU cpio does this */
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252 | }
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253 | }
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254 |
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255 | bytes += printf("070701"
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256 | "%08X%08X%08X%08X%08X%08X%08X"
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257 | "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
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258 | /* strlen+1: */ "%08X"
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259 | /* chksum: */ "00000000" /* (only for "070702" files) */
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260 | /* name,NUL: */ "%s%c",
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261 | (unsigned)(uint32_t) st.st_ino,
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262 | (unsigned)(uint32_t) st.st_mode,
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263 | (unsigned)(uint32_t) st.st_uid,
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264 | (unsigned)(uint32_t) st.st_gid,
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265 | (unsigned)(uint32_t) st.st_nlink,
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266 | (unsigned)(uint32_t) st.st_mtime,
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267 | (unsigned)(uint32_t) st.st_size,
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268 | (unsigned)(uint32_t) major(st.st_dev),
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269 | (unsigned)(uint32_t) minor(st.st_dev),
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270 | (unsigned)(uint32_t) major(st.st_rdev),
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271 | (unsigned)(uint32_t) minor(st.st_rdev),
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272 | (unsigned)(strlen(name) + 1),
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273 | name, '\0');
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274 | bytes = cpio_pad4(bytes);
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275 |
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276 | if (st.st_size) {
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277 | if (S_ISLNK(st.st_mode)) {
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278 | char *lpath = xmalloc_readlink_or_warn(name);
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279 | if (!lpath)
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280 | goto abort_cpio_o;
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281 | bytes += printf("%s", lpath);
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282 | free(lpath);
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283 | } else { /* S_ISREG */
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284 | int fd = xopen(name, O_RDONLY);
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285 | fflush_all();
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286 | /* We must abort if file got shorter too! */
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287 | bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
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288 | bytes += st.st_size;
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289 | close(fd);
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290 | }
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291 | bytes = cpio_pad4(bytes);
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292 | }
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293 |
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294 | if (!line) {
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295 | if (name != trailer)
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296 | goto next_link;
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297 | /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
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298 | return EXIT_SUCCESS;
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299 | }
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300 |
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301 | free(line);
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302 | } /* end of "while (1)" */
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303 | }
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304 | #endif
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305 |
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306 | int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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307 | int cpio_main(int argc UNUSED_PARAM, char **argv)
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308 | {
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309 | archive_handle_t *archive_handle;
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310 | char *cpio_filename;
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311 | IF_FEATURE_CPIO_O(const char *cpio_fmt = "";)
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312 | unsigned opt;
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313 |
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314 | #if ENABLE_LONG_OPTS
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315 | applet_long_options =
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316 | "extract\0" No_argument "i"
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317 | "list\0" No_argument "t"
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318 | #if ENABLE_FEATURE_CPIO_O
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319 | "create\0" No_argument "o"
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320 | "format\0" Required_argument "H"
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321 | #if ENABLE_FEATURE_CPIO_P
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322 | "pass-through\0" No_argument "p"
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323 | #endif
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324 | #endif
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325 | "verbose\0" No_argument "v"
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326 | "quiet\0" No_argument "\xff"
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327 | "to-stdout\0" No_argument "\xfe"
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328 | ;
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329 | #endif
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330 |
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331 | archive_handle = init_handle();
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332 | /* archive_handle->src_fd = STDIN_FILENO; - done by init_handle */
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333 | archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
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334 |
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335 | /* As of now we do not enforce this: */
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336 | /* -i,-t,-o,-p are mutually exclusive */
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337 | /* -u,-d,-m make sense only with -i or -p */
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338 | /* -L makes sense only with -o or -p */
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339 |
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340 | #if !ENABLE_FEATURE_CPIO_O
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341 | opt = getopt32(argv, OPTION_STR, &cpio_filename);
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342 | argv += optind;
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343 | if (opt & OPT_FILE) { /* -F */
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344 | xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
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345 | }
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346 | #else
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347 | opt = getopt32(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"), &cpio_filename, &cpio_fmt);
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348 | argv += optind;
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349 | if ((opt & (OPT_FILE|OPT_CREATE)) == OPT_FILE) { /* -F without -o */
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350 | xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
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351 | }
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352 | if (opt & OPT_PASSTHROUGH) {
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353 | pid_t pid;
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354 | struct fd_pair pp;
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355 |
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356 | if (argv[0] == NULL)
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357 | bb_show_usage();
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358 | if (opt & OPT_CREATE_LEADING_DIR)
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359 | mkdir(argv[0], 0777);
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360 | /* Crude existence check:
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361 | * close(xopen(argv[0], O_RDONLY | O_DIRECTORY));
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362 | * We can also xopen, fstat, IS_DIR, later fchdir.
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363 | * This would check for existence earlier and cleaner.
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364 | * As it stands now, if we fail xchdir later,
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365 | * child dies on EPIPE, unless it caught
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366 | * a diffrerent problem earlier.
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367 | * This is good enough for now.
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368 | */
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369 | #if !BB_MMU
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370 | pp.rd = 3;
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371 | pp.wr = 4;
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372 | if (!re_execed) {
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373 | close(3);
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374 | close(4);
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375 | xpiped_pair(pp);
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376 | }
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377 | #else
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378 | xpiped_pair(pp);
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379 | #endif
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380 | pid = fork_or_rexec(argv - optind);
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381 | if (pid == 0) { /* child */
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382 | close(pp.rd);
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383 | xmove_fd(pp.wr, STDOUT_FILENO);
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384 | goto dump;
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385 | }
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386 | /* parent */
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387 | USE_FOR_NOMMU(argv[-optind][0] &= 0x7f); /* undo fork_or_rexec() damage */
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388 | xchdir(*argv++);
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389 | close(pp.wr);
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390 | xmove_fd(pp.rd, STDIN_FILENO);
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391 | //opt &= ~OPT_PASSTHROUGH;
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392 | opt |= OPT_EXTRACT;
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393 | goto skip;
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394 | }
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395 | /* -o */
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396 | if (opt & OPT_CREATE) {
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397 | if (cpio_fmt[0] != 'n') /* we _require_ "-H newc" */
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398 | bb_show_usage();
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399 | if (opt & OPT_FILE) {
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400 | xmove_fd(xopen(cpio_filename, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
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401 | }
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402 | dump:
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403 | return cpio_o();
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404 | }
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405 | skip:
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406 | #endif
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407 |
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408 | /* One of either extract or test options must be given */
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409 | if ((opt & (OPT_TEST | OPT_EXTRACT)) == 0) {
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410 | bb_show_usage();
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411 | }
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412 |
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413 | if (opt & OPT_TEST) {
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414 | /* if both extract and test options are given, ignore extract option */
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415 | opt &= ~OPT_EXTRACT;
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416 | archive_handle->action_header = header_list;
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417 | }
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418 | if (opt & OPT_EXTRACT) {
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419 | archive_handle->action_data = data_extract_all;
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420 | if (opt & OPT_2STDOUT)
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421 | archive_handle->action_data = data_extract_to_stdout;
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422 | }
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423 | if (opt & OPT_UNCONDITIONAL) {
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424 | archive_handle->ah_flags |= ARCHIVE_UNLINK_OLD;
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425 | archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER;
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426 | }
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---|
427 | if (opt & OPT_VERBOSE) {
|
---|
428 | if (archive_handle->action_header == header_list) {
|
---|
429 | archive_handle->action_header = header_verbose_list;
|
---|
430 | } else {
|
---|
431 | archive_handle->action_header = header_list;
|
---|
432 | }
|
---|
433 | }
|
---|
434 | if (opt & OPT_CREATE_LEADING_DIR) {
|
---|
435 | archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS;
|
---|
436 | }
|
---|
437 | if (opt & OPT_PRESERVE_MTIME) {
|
---|
438 | archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
|
---|
439 | }
|
---|
440 |
|
---|
441 | while (*argv) {
|
---|
442 | archive_handle->filter = filter_accept_list;
|
---|
443 | llist_add_to(&archive_handle->accept, *argv);
|
---|
444 | argv++;
|
---|
445 | }
|
---|
446 |
|
---|
447 | /* see get_header_cpio */
|
---|
448 | archive_handle->cpio__blocks = (off_t)-1;
|
---|
449 | while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
|
---|
450 | continue;
|
---|
451 |
|
---|
452 | if (archive_handle->cpio__blocks != (off_t)-1
|
---|
453 | && !(opt & OPT_QUIET)
|
---|
454 | ) {
|
---|
455 | fprintf(stderr, "%"OFF_FMT"u blocks\n", archive_handle->cpio__blocks);
|
---|
456 | }
|
---|
457 |
|
---|
458 | return EXIT_SUCCESS;
|
---|
459 | }
|
---|