blob: 37ba77edf2f27633f291b0c531e0382b93d24a31 [file] [log] [blame]
Pascal Bellard22bdf902010-06-06 04:55:13 +02001/* vi: set sw=4 ts=4: */
2/*
3 * modinfo - retrieve module info
4 * Copyright (c) 2008 Pascal Bellard
5 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02006 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
Pascal Bellard22bdf902010-06-06 04:55:13 +02007 */
8
9//applet:IF_MODINFO(APPLET(modinfo, _BB_DIR_SBIN, _BB_SUID_DROP))
10
Denys Vlasenko7fdf5a82010-06-09 10:18:35 +020011//kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o
Pascal Bellard22bdf902010-06-06 04:55:13 +020012
13//config:config MODINFO
14//config: bool "modinfo"
15//config: default y
16//config: help
17//config: Show information about a Linux Kernel module
18
19#include <fnmatch.h>
20#include <sys/utsname.h> /* uname() */
21#include "libbb.h"
22#include "modutils.h"
23
24
25enum {
26 OPT_TAGS = (1 << 6) - 1,
27 OPT_F = (1 << 6), /* field name */
28 OPT_0 = (1 << 7), /* \0 as separator */
29};
30
31struct modinfo_env {
32 char *field;
33 int tags;
34};
35
36static int display(const char *data, const char *pattern, int flag)
37{
38 if (flag) {
39 int n = printf("%s:", pattern);
40 while (n++ < 16)
41 bb_putchar(' ');
42 }
43 return printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
44}
45
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +020046static void modinfo(const char *path, const char *version,
47 struct modinfo_env *env)
Pascal Bellard22bdf902010-06-06 04:55:13 +020048{
49 static const char *const shortcuts[] = {
50 "filename",
51 "description",
52 "author",
53 "license",
54 "vermagic",
55 "parm",
56 };
57 size_t len;
58 int j, length;
59 char *ptr, *the_module;
60 const char *field = env->field;
61 int tags = env->tags;
62
63 if (tags & 1) { /* filename */
64 display(path, shortcuts[0], 1 != tags);
65 }
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +020066
Pascal Bellard22bdf902010-06-06 04:55:13 +020067 len = MAXINT(ssize_t);
68 the_module = xmalloc_open_zipped_read_close(path, &len);
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +020069 if (!the_module) {
70 if (path[0] == '/')
71 return;
72 /* Newer depmod puts relative paths in modules.dep */
73 path = xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, version, path);
74 the_module = xmalloc_open_zipped_read_close(path, &len);
75 free((char*)path);
76 if (!the_module)
77 return;
78 }
79
Pascal Bellard22bdf902010-06-06 04:55:13 +020080 if (field)
81 tags |= OPT_F;
82 for (j = 1; (1<<j) & (OPT_TAGS + OPT_F); j++) {
83 const char *pattern = field;
84 if ((1<<j) & OPT_TAGS)
85 pattern = shortcuts[j];
86 if (!((1<<j) & tags))
87 continue;
88 length = strlen(pattern);
89 ptr = the_module;
90 while (1) {
91 ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
92 if (ptr == NULL) /* no occurance left, done */
93 break;
94 if (strncmp(ptr, pattern, length) == 0 && ptr[length] == '=') {
95 ptr += length + 1;
96 ptr += display(ptr, pattern, (1<<j) != tags);
97 }
98 ++ptr;
99 }
100 }
101 free(the_module);
102}
103
104//usage:#define modinfo_trivial_usage
105//usage: "[-adlp0] [-F keyword] MODULE"
106//usage:#define modinfo_full_usage "\n\n"
107//usage: "Options:"
108//usage: "\n -a Shortcut for '-F author'"
109//usage: "\n -d Shortcut for '-F description'"
110//usage: "\n -l Shortcut for '-F license'"
111//usage: "\n -p Shortcut for '-F parm'"
112//usage: "\n -F keyword Keyword to look for"
113//usage: "\n -0 Separate output with NULs"
114//usage:#define modinfo_example_usage
115//usage: "$ modinfo -F vermagic loop\n"
116
117int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
118int modinfo_main(int argc UNUSED_PARAM, char **argv)
119{
120 struct modinfo_env env;
121 char name[MODULE_NAME_LEN];
122 struct utsname uts;
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +0200123 parser_t *parser;
Pascal Bellard22bdf902010-06-06 04:55:13 +0200124 char *colon, *tokens[2];
125 unsigned opts;
126 unsigned i;
127
128 env.field = NULL;
129 opt_complementary = "-1"; /* minimum one param */
130 opts = getopt32(argv, "fdalvpF:0", &env.field);
131 env.tags = opts & OPT_TAGS ? opts & OPT_TAGS : OPT_TAGS;
132 argv += optind;
133
134 uname(&uts);
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +0200135 parser = config_open2(
136 xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, uts.release, CONFIG_DEFAULT_DEPMOD_FILE),
Pascal Bellard22bdf902010-06-06 04:55:13 +0200137 xfopen_for_read
138 );
139
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +0200140 while (config_read(parser, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
Pascal Bellard22bdf902010-06-06 04:55:13 +0200141 colon = last_char_is(tokens[0], ':');
142 if (colon == NULL)
143 continue;
144 *colon = '\0';
145 filename2modname(tokens[0], name);
146 for (i = 0; argv[i]; i++) {
147 if (fnmatch(argv[i], name, 0) == 0) {
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +0200148 modinfo(tokens[0], uts.release, &env);
Pascal Bellard22bdf902010-06-06 04:55:13 +0200149 argv[i] = (char *) "";
150 }
151 }
152 }
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +0200153 if (ENABLE_FEATURE_CLEAN_UP)
154 config_close(parser);
155
Pascal Bellard22bdf902010-06-06 04:55:13 +0200156 for (i = 0; argv[i]; i++) {
157 if (argv[i][0]) {
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +0200158 modinfo(argv[i], uts.release, &env);
Pascal Bellard22bdf902010-06-06 04:55:13 +0200159 }
160 }
Lauri Kasanen1b14cdb2010-06-27 00:35:49 +0200161
Pascal Bellard22bdf902010-06-06 04:55:13 +0200162 return 0;
163}