[3320] | 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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