1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Common code for gunzip-like applets
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4 | *
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5 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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6 | */
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7 | #include "libbb.h"
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8 | #include "archive.h"
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9 |
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10 | enum {
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11 | OPT_STDOUT = 1 << 0,
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12 | OPT_FORCE = 1 << 1,
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13 | /* only some decompressors: */
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14 | OPT_VERBOSE = 1 << 2,
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15 | OPT_DECOMPRESS = 1 << 3,
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16 | OPT_TEST = 1 << 4,
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17 | };
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18 |
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19 | static
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20 | int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
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21 | {
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22 | int fd = open3_or_warn(filename, flags, mode);
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23 | if (fd < 0) {
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24 | return 1;
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25 | }
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26 | xmove_fd(fd, to_fd);
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27 | return 0;
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28 | }
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29 |
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30 | char* FAST_FUNC append_ext(char *filename, const char *expected_ext)
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31 | {
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32 | return xasprintf("%s.%s", filename, expected_ext);
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33 | }
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34 |
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35 | int FAST_FUNC bbunpack(char **argv,
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36 | IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(unpack_info_t *info),
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37 | char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
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38 | const char *expected_ext
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39 | )
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40 | {
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41 | struct stat stat_buf;
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42 | IF_DESKTOP(long long) int status;
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43 | char *filename, *new_name;
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44 | smallint exitcode = 0;
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45 | unpack_info_t info;
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46 |
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47 | do {
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48 | /* NB: new_name is *maybe* malloc'ed! */
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49 | new_name = NULL;
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50 | filename = *argv; /* can be NULL - 'streaming' bunzip2 */
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51 |
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52 | if (filename && LONE_DASH(filename))
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53 | filename = NULL;
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54 |
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55 | /* Open src */
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56 | if (filename) {
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57 | if (stat(filename, &stat_buf) != 0) {
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58 | bb_simple_perror_msg(filename);
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59 | err:
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60 | exitcode = 1;
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61 | goto free_name;
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62 | }
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63 | if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
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64 | goto err;
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65 | }
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66 |
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67 | /* Special cases: test, stdout */
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68 | if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
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69 | if (option_mask32 & OPT_TEST)
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70 | if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
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71 | goto err;
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72 | filename = NULL;
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73 | }
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74 |
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75 | /* Open dst if we are going to unpack to file */
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76 | if (filename) {
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77 | new_name = make_new_name(filename, expected_ext);
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78 | if (!new_name) {
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79 | bb_error_msg("%s: unknown suffix - ignored", filename);
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80 | goto err;
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81 | }
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82 |
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83 | /* -f: overwrite existing output files */
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84 | if (option_mask32 & OPT_FORCE) {
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85 | unlink(new_name);
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86 | }
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87 |
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88 | /* O_EXCL: "real" bunzip2 doesn't overwrite files */
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89 | /* GNU gunzip does not bail out, but goes to next file */
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90 | if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
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91 | stat_buf.st_mode))
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92 | goto err;
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93 | }
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94 |
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95 | /* Check that the input is sane */
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96 | if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) {
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97 | bb_error_msg_and_die("compressed data not read from terminal, "
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98 | "use -f to force it");
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99 | }
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100 |
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101 | /* memset(&info, 0, sizeof(info)); */
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102 | info.mtime = 0; /* so far it has one member only */
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103 | status = unpacker(&info);
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104 | if (status < 0)
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105 | exitcode = 1;
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106 | xclose(STDOUT_FILENO); /* with error check! */
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107 |
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108 | if (filename) {
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109 | char *del = new_name;
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110 | if (status >= 0) {
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111 | /* TODO: restore other things? */
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112 | if (info.mtime) {
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113 | struct timeval times[2];
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114 |
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115 | times[1].tv_sec = times[0].tv_sec = info.mtime;
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116 | times[1].tv_usec = times[0].tv_usec = 0;
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117 | /* Note: we closed it first.
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118 | * On some systems calling utimes
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119 | * then closing resets the mtime
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120 | * back to current time. */
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121 | utimes(new_name, times); /* ignoring errors */
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122 | }
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123 |
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124 | /* Delete _compressed_ file */
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125 | del = filename;
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126 | /* restore extension (unless tgz -> tar case) */
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127 | if (new_name == filename)
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128 | filename[strlen(filename)] = '.';
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129 | }
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130 | xunlink(del);
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131 |
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132 | #if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
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133 | /* Extreme bloat for gunzip compat */
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134 | if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
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135 | fprintf(stderr, "%s: %u%% - replaced with %s\n",
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136 | filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
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137 | }
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138 | #endif
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139 |
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140 | free_name:
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141 | if (new_name != filename)
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142 | free(new_name);
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143 | }
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144 | } while (*argv && *++argv);
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145 |
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146 | return exitcode;
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147 | }
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148 |
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149 | #if ENABLE_UNCOMPRESS || ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNXZ
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150 | static
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151 | char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext)
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152 | {
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153 | char *extension = strrchr(filename, '.');
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154 | if (!extension || strcmp(extension + 1, expected_ext) != 0) {
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155 | /* Mimic GNU gunzip - "real" bunzip2 tries to */
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156 | /* unpack file anyway, to file.out */
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157 | return NULL;
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158 | }
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159 | *extension = '\0';
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160 | return filename;
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161 | }
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162 | #endif
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163 |
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164 |
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165 | /*
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166 | * Uncompress applet for busybox (c) 2002 Glenn McGrath
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167 | *
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168 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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169 | */
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170 | #if ENABLE_UNCOMPRESS
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171 | static
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172 | IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(unpack_info_t *info UNUSED_PARAM)
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173 | {
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174 | IF_DESKTOP(long long) int status = -1;
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175 |
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176 | if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
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177 | bb_error_msg("invalid magic");
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178 | } else {
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179 | status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
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180 | }
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181 | return status;
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182 | }
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183 | int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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184 | int uncompress_main(int argc UNUSED_PARAM, char **argv)
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185 | {
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186 | getopt32(argv, "cf");
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187 | argv += optind;
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188 |
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189 | return bbunpack(argv, unpack_uncompress, make_new_name_generic, "Z");
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190 | }
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191 | #endif
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192 |
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193 |
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194 | /*
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195 | * Gzip implementation for busybox
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196 | *
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197 | * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
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198 | *
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199 | * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
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200 | * based on gzip sources
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201 | *
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202 | * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
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203 | * well as stdin/stdout, and to generally behave itself wrt command line
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204 | * handling.
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205 | *
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206 | * General cleanup to better adhere to the style guide and make use of standard
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207 | * busybox functions by Glenn McGrath
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208 | *
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209 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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210 | *
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211 | * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
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212 | * Copyright (C) 1992-1993 Jean-loup Gailly
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213 | * The unzip code was written and put in the public domain by Mark Adler.
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214 | * Portions of the lzw code are derived from the public domain 'compress'
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215 | * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
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216 | * Ken Turkowski, Dave Mack and Peter Jannesen.
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217 | *
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218 | * See the license_msg below and the file COPYING for the software license.
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219 | * See the file algorithm.doc for the compression algorithms and file formats.
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220 | */
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221 | #if ENABLE_GUNZIP
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222 | static
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223 | char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UNUSED_PARAM)
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224 | {
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225 | char *extension = strrchr(filename, '.');
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226 |
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227 | if (!extension)
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228 | return NULL;
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229 |
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230 | extension++;
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231 | if (strcmp(extension, "tgz" + 1) == 0
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232 | #if ENABLE_FEATURE_SEAMLESS_Z
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233 | || (extension[0] == 'Z' && extension[1] == '\0')
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234 | #endif
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235 | ) {
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236 | extension[-1] = '\0';
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237 | } else if (strcmp(extension, "tgz") == 0) {
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238 | filename = xstrdup(filename);
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239 | extension = strrchr(filename, '.');
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240 | extension[2] = 'a';
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241 | extension[3] = 'r';
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242 | } else {
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243 | return NULL;
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244 | }
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245 | return filename;
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246 | }
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247 | static
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248 | IF_DESKTOP(long long) int FAST_FUNC unpack_gunzip(unpack_info_t *info)
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249 | {
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250 | IF_DESKTOP(long long) int status = -1;
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251 |
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252 | /* do the decompression, and cleanup */
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253 | if (xread_char(STDIN_FILENO) == 0x1f) {
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254 | unsigned char magic2;
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255 |
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256 | magic2 = xread_char(STDIN_FILENO);
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257 | if (ENABLE_FEATURE_SEAMLESS_Z && magic2 == 0x9d) {
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258 | status = unpack_Z_stream(STDIN_FILENO, STDOUT_FILENO);
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259 | } else if (magic2 == 0x8b) {
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260 | status = unpack_gz_stream_with_info(STDIN_FILENO, STDOUT_FILENO, info);
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261 | } else {
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262 | goto bad_magic;
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263 | }
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264 | if (status < 0) {
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265 | bb_error_msg("error inflating");
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266 | }
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267 | } else {
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268 | bad_magic:
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269 | bb_error_msg("invalid magic");
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270 | /* status is still == -1 */
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271 | }
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272 | return status;
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273 | }
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274 | /*
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275 | * Linux kernel build uses gzip -d -n. We accept and ignore it.
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276 | * Man page says:
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277 | * -n --no-name
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278 | * gzip: do not save the original file name and time stamp.
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279 | * (The original name is always saved if the name had to be truncated.)
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280 | * gunzip: do not restore the original file name/time even if present
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281 | * (remove only the gzip suffix from the compressed file name).
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282 | * This option is the default when decompressing.
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283 | * -N --name
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284 | * gzip: always save the original file name and time stamp (this is the default)
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285 | * gunzip: restore the original file name and time stamp if present.
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286 | */
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287 | int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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288 | int gunzip_main(int argc UNUSED_PARAM, char **argv)
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289 | {
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290 | getopt32(argv, "cfvdtn");
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291 | argv += optind;
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292 | /* if called as zcat */
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293 | if (applet_name[1] == 'c')
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294 | option_mask32 |= OPT_STDOUT;
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295 |
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296 | return bbunpack(argv, unpack_gunzip, make_new_name_gunzip, /*unused:*/ NULL);
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297 | }
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298 | #endif
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299 |
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300 |
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301 | /*
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302 | * Modified for busybox by Glenn McGrath
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303 | * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
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304 | *
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305 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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306 | */
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307 | //usage:#define bunzip2_trivial_usage
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308 | //usage: "[-cf] [FILE]..."
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309 | //usage:#define bunzip2_full_usage "\n\n"
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310 | //usage: "Decompress FILEs (or stdin)\n"
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311 | //usage: "\nOptions:"
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312 | //usage: "\n -c Write to stdout"
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313 | //usage: "\n -f Force"
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314 | //usage:#define bzcat_trivial_usage
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315 | //usage: "FILE"
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316 | //usage:#define bzcat_full_usage "\n\n"
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317 | //usage: "Decompress to stdout"
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318 | //applet:IF_BUNZIP2(APPLET(bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP))
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319 | //applet:IF_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, _BB_DIR_USR_BIN, _BB_SUID_DROP, bzcat))
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320 | #if ENABLE_BUNZIP2
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321 | static
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322 | IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(unpack_info_t *info UNUSED_PARAM)
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323 | {
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324 | return unpack_bz2_stream_prime(STDIN_FILENO, STDOUT_FILENO);
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325 | }
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326 | int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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327 | int bunzip2_main(int argc UNUSED_PARAM, char **argv)
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328 | {
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329 | getopt32(argv, "cfvdt");
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330 | argv += optind;
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331 | if (applet_name[2] == 'c') /* bzcat */
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332 | option_mask32 |= OPT_STDOUT;
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333 |
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334 | return bbunpack(argv, unpack_bunzip2, make_new_name_generic, "bz2");
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335 | }
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336 | #endif
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337 |
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338 |
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339 | /*
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340 | * Small lzma deflate implementation.
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341 | * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
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342 | *
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343 | * Based on bunzip.c from busybox
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344 | *
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345 | * Licensed under GPLv2, see file LICENSE in this source tree.
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346 | */
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347 | #if ENABLE_UNLZMA
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348 | static
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349 | IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(unpack_info_t *info UNUSED_PARAM)
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350 | {
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351 | return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
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352 | }
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353 | int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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354 | int unlzma_main(int argc UNUSED_PARAM, char **argv)
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355 | {
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356 | IF_LZMA(int opts =) getopt32(argv, "cfvdt");
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357 | # if ENABLE_LZMA
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358 | /* lzma without -d or -t? */
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359 | if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
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360 | bb_show_usage();
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361 | # endif
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362 | /* lzcat? */
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363 | if (applet_name[2] == 'c')
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364 | option_mask32 |= OPT_STDOUT;
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365 |
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366 | argv += optind;
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367 | return bbunpack(argv, unpack_unlzma, make_new_name_generic, "lzma");
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368 | }
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369 | #endif
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370 |
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371 |
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372 | #if ENABLE_UNXZ
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373 | static
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374 | IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(unpack_info_t *info UNUSED_PARAM)
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375 | {
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376 | struct {
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377 | uint32_t v1;
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378 | uint16_t v2;
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379 | } magic;
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380 | xread(STDIN_FILENO, &magic, 6);
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381 | if (magic.v1 != XZ_MAGIC1a || magic.v2 != XZ_MAGIC2a) {
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382 | bb_error_msg("invalid magic");
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383 | return -1;
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384 | }
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385 | return unpack_xz_stream(STDIN_FILENO, STDOUT_FILENO);
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386 | }
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387 | int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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388 | int unxz_main(int argc UNUSED_PARAM, char **argv)
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389 | {
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390 | IF_XZ(int opts =) getopt32(argv, "cfvdt");
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391 | # if ENABLE_XZ
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392 | /* xz without -d or -t? */
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393 | if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
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394 | bb_show_usage();
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395 | # endif
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396 | /* xzcat? */
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397 | if (applet_name[2] == 'c')
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398 | option_mask32 |= OPT_STDOUT;
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399 |
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400 | argv += optind;
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401 | return bbunpack(argv, unpack_unxz, make_new_name_generic, "xz");
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402 | }
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403 | #endif
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