1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * modinfo - retrieve module info
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4 | * Copyright (c) 2008 Pascal Bellard
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5 | *
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6 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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7 | */
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8 | //config:config MODINFO
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9 | //config: bool "modinfo"
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10 | //config: default y
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11 | //config: select PLATFORM_LINUX
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12 | //config: help
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13 | //config: Show information about a Linux Kernel module
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14 |
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15 | //applet:IF_MODINFO(APPLET(modinfo, BB_DIR_SBIN, BB_SUID_DROP))
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16 |
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17 | //kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o
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18 |
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19 | #include <fnmatch.h>
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20 | #include <sys/utsname.h> /* uname() */
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21 | #include "libbb.h"
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22 | #include "modutils.h"
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23 |
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24 | static const char *const shortcuts[] = {
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25 | "filename", // -n
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26 | "author", // -a
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27 | "description", // -d
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28 | "license", // -l
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29 | "parm", // -p
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30 | "version", // the rest has no shortcut options
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31 | "alias",
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32 | "srcversion",
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33 | "depends",
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34 | "uts_release",
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35 | "intree",
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36 | "vermagic",
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37 | "firmware",
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38 | };
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39 |
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40 | enum {
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41 | OPT_0 = (1 << 0), /* \0 as separator */
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42 | OPT_F = (1 << 1), /* field name */
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43 | /* first bits are for -nadlp options, the rest are for
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44 | * fields not selectable with "shortcut" options
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45 | */
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46 | OPT_n = (1 << 2),
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47 | OPT_TAGS = ((1 << ARRAY_SIZE(shortcuts)) - 1) << 2,
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48 | };
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49 |
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50 | static void display(const char *data, const char *pattern)
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51 | {
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52 | int flag = option_mask32 >> 1; /* shift out -0 bit */
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53 | if (flag & (flag-1)) {
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54 | /* more than one field to show: print "FIELD:" pfx */
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55 | int n = printf("%s:", pattern);
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56 | while (n++ < 16)
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57 | bb_putchar(' ');
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58 | }
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59 | printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
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60 | }
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61 |
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62 | static void modinfo(const char *path, const char *version,
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63 | const char *field)
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64 | {
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65 | size_t len;
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66 | int j;
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67 | char *ptr, *the_module;
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68 | char *allocated;
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69 | int tags = option_mask32;
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70 |
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71 | allocated = NULL;
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72 | len = MAXINT(ssize_t);
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73 | the_module = xmalloc_open_zipped_read_close(path, &len);
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74 | if (!the_module) {
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75 | if (path[0] == '/')
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76 | return;
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77 | /* Newer depmod puts relative paths in modules.dep */
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78 | path = allocated = xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, version, path);
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79 | the_module = xmalloc_open_zipped_read_close(path, &len);
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80 | if (!the_module) {
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81 | bb_error_msg("module '%s' not found", path);
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82 | goto ret;
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83 | }
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84 | }
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85 |
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86 | for (j = 1; (1<<j) & (OPT_TAGS|OPT_F); j++) {
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87 | const char *pattern;
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88 |
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89 | if (!((1<<j) & tags))
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90 | continue;
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91 |
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92 | pattern = field;
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93 | if ((1<<j) & OPT_TAGS)
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94 | pattern = shortcuts[j-2];
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95 |
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96 | if (strcmp(pattern, shortcuts[0]) == 0) {
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97 | /* "-n" or "-F filename" */
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98 | display(path, shortcuts[0]);
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99 | continue;
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100 | }
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101 |
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102 | ptr = the_module;
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103 | while (1) {
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104 | char *after_pattern;
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105 |
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106 | ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
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107 | if (ptr == NULL) /* no occurance left, done */
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108 | break;
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109 | after_pattern = is_prefixed_with(ptr, pattern);
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110 | if (after_pattern && *after_pattern == '=') {
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111 | /* field prefixes are 0x80 or 0x00 */
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112 | if ((ptr[-1] & 0x7F) == 0x00) {
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113 | ptr = after_pattern + 1;
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114 | display(ptr, pattern);
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115 | ptr += strlen(ptr);
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116 | }
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117 | }
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118 | ++ptr;
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119 | }
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120 | }
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121 | free(the_module);
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122 | ret:
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123 | free(allocated);
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124 | }
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125 |
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126 | //usage:#define modinfo_trivial_usage
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127 | //usage: "[-adlpn0] [-F keyword] MODULE"
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128 | //usage:#define modinfo_full_usage "\n\n"
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129 | //usage: " -a Shortcut for '-F author'"
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130 | //usage: "\n -d Shortcut for '-F description'"
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131 | //usage: "\n -l Shortcut for '-F license'"
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132 | //usage: "\n -p Shortcut for '-F parm'"
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133 | ////usage: "\n -n Shortcut for '-F filename'"
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134 | //usage: "\n -F keyword Keyword to look for"
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135 | //usage: "\n -0 Separate output with NULs"
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136 | //usage:#define modinfo_example_usage
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137 | //usage: "$ modinfo -F vermagic loop\n"
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138 |
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139 | int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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140 | int modinfo_main(int argc UNUSED_PARAM, char **argv)
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141 | {
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142 | const char *field;
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143 | char name[MODULE_NAME_LEN];
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144 | struct utsname uts;
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145 | parser_t *parser;
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146 | char *colon, *tokens[2];
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147 | unsigned opts;
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148 | unsigned i;
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149 |
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150 | field = NULL;
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151 | opt_complementary = "-1"; /* minimum one param */
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152 | opts = getopt32(argv, "0F:nadlp", &field);
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153 | /* If no field selected, show all */
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154 | if (!(opts & (OPT_TAGS|OPT_F)))
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155 | option_mask32 |= OPT_TAGS;
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156 | argv += optind;
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157 |
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158 | uname(&uts);
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159 | parser = config_open2(
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160 | xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, uts.release, CONFIG_DEFAULT_DEPMOD_FILE),
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161 | xfopen_for_read
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162 | );
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163 |
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164 | while (config_read(parser, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
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165 | colon = last_char_is(tokens[0], ':');
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166 | if (colon == NULL)
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167 | continue;
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168 | *colon = '\0';
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169 | filename2modname(bb_basename(tokens[0]), name);
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170 | for (i = 0; argv[i]; i++) {
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171 | if (fnmatch(argv[i], name, 0) == 0) {
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172 | modinfo(tokens[0], uts.release, field);
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173 | argv[i] = (char *) "";
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174 | }
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175 | }
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176 | }
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177 | if (ENABLE_FEATURE_CLEAN_UP)
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178 | config_close(parser);
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179 |
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180 | for (i = 0; argv[i]; i++) {
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181 | if (argv[i][0]) {
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182 | modinfo(argv[i], uts.release, field);
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183 | }
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184 | }
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185 |
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186 | return 0;
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187 | }
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