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 |
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9 | //applet:IF_MODINFO(APPLET(modinfo, _BB_DIR_SBIN, _BB_SUID_DROP))
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10 |
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11 | //kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o
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12 |
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13 | //config:config MODINFO
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14 | //config: bool "modinfo"
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15 | //config: default y
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16 | //config: help
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17 | //config: Show information about a Linux Kernel module
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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 |
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25 | enum {
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26 | OPT_TAGS = (1 << 6) - 1,
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27 | OPT_F = (1 << 6), /* field name */
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28 | OPT_0 = (1 << 7), /* \0 as separator */
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29 | };
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30 |
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31 | struct modinfo_env {
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32 | char *field;
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33 | int tags;
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34 | };
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35 |
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36 | static int display(const char *data, const char *pattern, int flag)
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37 | {
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38 | if (flag) {
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39 | int n = printf("%s:", pattern);
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40 | while (n++ < 16)
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41 | bb_putchar(' ');
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42 | }
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43 | return printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
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44 | }
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45 |
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46 | static void modinfo(const char *path, const char *version,
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47 | struct modinfo_env *env)
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48 | {
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49 | static const char *const shortcuts[] = {
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50 | "filename",
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51 | "description",
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52 | "author",
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53 | "license",
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54 | "vermagic",
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55 | "parm",
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56 | };
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57 | size_t len;
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58 | int j, length;
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59 | char *ptr, *the_module;
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60 | const char *field = env->field;
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61 | int tags = env->tags;
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62 |
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63 | if (tags & 1) { /* filename */
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64 | display(path, shortcuts[0], 1 != tags);
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65 | }
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66 |
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67 | len = MAXINT(ssize_t);
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68 | the_module = xmalloc_open_zipped_read_close(path, &len);
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69 | if (!the_module) {
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70 | if (path[0] == '/')
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71 | return;
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72 | /* Newer depmod puts relative paths in modules.dep */
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73 | path = xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, version, path);
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74 | the_module = xmalloc_open_zipped_read_close(path, &len);
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75 | free((char*)path);
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76 | if (!the_module)
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77 | return;
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78 | }
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79 |
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80 | if (field)
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81 | tags |= OPT_F;
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82 | for (j = 1; (1<<j) & (OPT_TAGS + OPT_F); j++) {
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83 | const char *pattern = field;
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84 | if ((1<<j) & OPT_TAGS)
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85 | pattern = shortcuts[j];
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86 | if (!((1<<j) & tags))
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87 | continue;
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88 | length = strlen(pattern);
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89 | ptr = the_module;
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90 | while (1) {
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91 | ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
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92 | if (ptr == NULL) /* no occurance left, done */
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93 | break;
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94 | if (strncmp(ptr, pattern, length) == 0 && ptr[length] == '=') {
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95 | ptr += length + 1;
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96 | ptr += display(ptr, pattern, (1<<j) != tags);
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97 | }
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98 | ++ptr;
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99 | }
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100 | }
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101 | free(the_module);
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102 | }
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103 |
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104 | //usage:#define modinfo_trivial_usage
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105 | //usage: "[-adlp0] [-F keyword] MODULE"
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106 | //usage:#define modinfo_full_usage "\n\n"
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107 | //usage: "Options:"
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108 | //usage: "\n -a Shortcut for '-F author'"
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109 | //usage: "\n -d Shortcut for '-F description'"
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110 | //usage: "\n -l Shortcut for '-F license'"
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111 | //usage: "\n -p Shortcut for '-F parm'"
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112 | //usage: "\n -F keyword Keyword to look for"
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113 | //usage: "\n -0 Separate output with NULs"
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114 | //usage:#define modinfo_example_usage
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115 | //usage: "$ modinfo -F vermagic loop\n"
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116 |
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117 | int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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118 | int modinfo_main(int argc UNUSED_PARAM, char **argv)
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119 | {
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120 | struct modinfo_env env;
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121 | char name[MODULE_NAME_LEN];
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122 | struct utsname uts;
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123 | parser_t *parser;
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124 | char *colon, *tokens[2];
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125 | unsigned opts;
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126 | unsigned i;
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127 |
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128 | env.field = NULL;
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129 | opt_complementary = "-1"; /* minimum one param */
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130 | opts = getopt32(argv, "fdalvpF:0", &env.field);
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131 | env.tags = opts & OPT_TAGS ? opts & OPT_TAGS : OPT_TAGS;
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132 | argv += optind;
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133 |
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134 | uname(&uts);
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135 | parser = config_open2(
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136 | xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, uts.release, CONFIG_DEFAULT_DEPMOD_FILE),
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137 | xfopen_for_read
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138 | );
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139 |
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140 | while (config_read(parser, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
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141 | colon = last_char_is(tokens[0], ':');
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142 | if (colon == NULL)
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143 | continue;
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144 | *colon = '\0';
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145 | filename2modname(tokens[0], name);
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146 | for (i = 0; argv[i]; i++) {
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147 | if (fnmatch(argv[i], name, 0) == 0) {
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148 | modinfo(tokens[0], uts.release, &env);
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149 | argv[i] = (char *) "";
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150 | }
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151 | }
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152 | }
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153 | if (ENABLE_FEATURE_CLEAN_UP)
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154 | config_close(parser);
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155 |
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156 | for (i = 0; argv[i]; i++) {
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157 | if (argv[i][0]) {
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158 | modinfo(argv[i], uts.release, &env);
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159 | }
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160 | }
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161 |
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162 | return 0;
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163 | }
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