blob: aa641ad54c7eeddaa95beb29b9b3f75d2664d80f
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * modinfo - retrieve module info |
4 | * Copyright (c) 2008 Pascal Bellard |
5 | * |
6 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
7 | */ |
8 | //config:config MODINFO |
9 | //config: bool "modinfo" |
10 | //config: default y |
11 | //config: select PLATFORM_LINUX |
12 | //config: help |
13 | //config: Show information about a Linux Kernel module |
14 | |
15 | //applet:IF_MODINFO(APPLET(modinfo, BB_DIR_SBIN, BB_SUID_DROP)) |
16 | |
17 | //kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o |
18 | |
19 | #include <fnmatch.h> |
20 | #include <sys/utsname.h> /* uname() */ |
21 | #include "libbb.h" |
22 | #include "modutils.h" |
23 | |
24 | static const char *const shortcuts[] = { |
25 | "filename", // -n |
26 | "author", // -a |
27 | "description", // -d |
28 | "license", // -l |
29 | "parm", // -p |
30 | "version", // the rest has no shortcut options |
31 | "alias", |
32 | "srcversion", |
33 | "depends", |
34 | "uts_release", |
35 | "intree", |
36 | "vermagic", |
37 | "firmware", |
38 | }; |
39 | |
40 | enum { |
41 | OPT_0 = (1 << 0), /* \0 as separator */ |
42 | OPT_F = (1 << 1), /* field name */ |
43 | /* first bits are for -nadlp options, the rest are for |
44 | * fields not selectable with "shortcut" options |
45 | */ |
46 | OPT_n = (1 << 2), |
47 | OPT_TAGS = ((1 << ARRAY_SIZE(shortcuts)) - 1) << 2, |
48 | }; |
49 | |
50 | static void display(const char *data, const char *pattern) |
51 | { |
52 | int flag = option_mask32 >> 1; /* shift out -0 bit */ |
53 | if (flag & (flag-1)) { |
54 | /* more than one field to show: print "FIELD:" pfx */ |
55 | int n = printf("%s:", pattern); |
56 | while (n++ < 16) |
57 | bb_putchar(' '); |
58 | } |
59 | printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n'); |
60 | } |
61 | |
62 | static void modinfo(const char *path, const char *version, |
63 | const char *field) |
64 | { |
65 | size_t len; |
66 | int j; |
67 | char *ptr, *the_module; |
68 | char *allocated; |
69 | int tags = option_mask32; |
70 | |
71 | allocated = NULL; |
72 | len = MAXINT(ssize_t); |
73 | the_module = xmalloc_open_zipped_read_close(path, &len); |
74 | if (!the_module) { |
75 | if (path[0] == '/') |
76 | return; |
77 | /* Newer depmod puts relative paths in modules.dep */ |
78 | path = allocated = xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, version, path); |
79 | the_module = xmalloc_open_zipped_read_close(path, &len); |
80 | if (!the_module) { |
81 | bb_error_msg("module '%s' not found", path); |
82 | goto ret; |
83 | } |
84 | } |
85 | |
86 | for (j = 1; (1<<j) & (OPT_TAGS|OPT_F); j++) { |
87 | const char *pattern; |
88 | |
89 | if (!((1<<j) & tags)) |
90 | continue; |
91 | |
92 | pattern = field; |
93 | if ((1<<j) & OPT_TAGS) |
94 | pattern = shortcuts[j-2]; |
95 | |
96 | if (strcmp(pattern, shortcuts[0]) == 0) { |
97 | /* "-n" or "-F filename" */ |
98 | display(path, shortcuts[0]); |
99 | continue; |
100 | } |
101 | |
102 | ptr = the_module; |
103 | while (1) { |
104 | char *after_pattern; |
105 | |
106 | ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module)); |
107 | if (ptr == NULL) /* no occurance left, done */ |
108 | break; |
109 | after_pattern = is_prefixed_with(ptr, pattern); |
110 | if (after_pattern && *after_pattern == '=') { |
111 | /* field prefixes are 0x80 or 0x00 */ |
112 | if ((ptr[-1] & 0x7F) == 0x00) { |
113 | ptr = after_pattern + 1; |
114 | display(ptr, pattern); |
115 | ptr += strlen(ptr); |
116 | } |
117 | } |
118 | ++ptr; |
119 | } |
120 | } |
121 | free(the_module); |
122 | ret: |
123 | free(allocated); |
124 | } |
125 | |
126 | //usage:#define modinfo_trivial_usage |
127 | //usage: "[-adlpn0] [-F keyword] MODULE" |
128 | //usage:#define modinfo_full_usage "\n\n" |
129 | //usage: " -a Shortcut for '-F author'" |
130 | //usage: "\n -d Shortcut for '-F description'" |
131 | //usage: "\n -l Shortcut for '-F license'" |
132 | //usage: "\n -p Shortcut for '-F parm'" |
133 | ////usage: "\n -n Shortcut for '-F filename'" |
134 | //usage: "\n -F keyword Keyword to look for" |
135 | //usage: "\n -0 Separate output with NULs" |
136 | //usage:#define modinfo_example_usage |
137 | //usage: "$ modinfo -F vermagic loop\n" |
138 | |
139 | int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
140 | int modinfo_main(int argc UNUSED_PARAM, char **argv) |
141 | { |
142 | const char *field; |
143 | char name[MODULE_NAME_LEN]; |
144 | struct utsname uts; |
145 | parser_t *parser; |
146 | char *colon, *tokens[2]; |
147 | unsigned opts; |
148 | unsigned i; |
149 | |
150 | field = NULL; |
151 | opt_complementary = "-1"; /* minimum one param */ |
152 | opts = getopt32(argv, "0F:nadlp", &field); |
153 | /* If no field selected, show all */ |
154 | if (!(opts & (OPT_TAGS|OPT_F))) |
155 | option_mask32 |= OPT_TAGS; |
156 | argv += optind; |
157 | |
158 | uname(&uts); |
159 | parser = config_open2( |
160 | xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, uts.release, CONFIG_DEFAULT_DEPMOD_FILE), |
161 | xfopen_for_read |
162 | ); |
163 | |
164 | while (config_read(parser, tokens, 2, 1, "# \t", PARSE_NORMAL)) { |
165 | colon = last_char_is(tokens[0], ':'); |
166 | if (colon == NULL) |
167 | continue; |
168 | *colon = '\0'; |
169 | filename2modname(bb_basename(tokens[0]), name); |
170 | for (i = 0; argv[i]; i++) { |
171 | if (fnmatch(argv[i], name, 0) == 0) { |
172 | modinfo(tokens[0], uts.release, field); |
173 | argv[i] = (char *) ""; |
174 | } |
175 | } |
176 | } |
177 | if (ENABLE_FEATURE_CLEAN_UP) |
178 | config_close(parser); |
179 | |
180 | for (i = 0; argv[i]; i++) { |
181 | if (argv[i][0]) { |
182 | modinfo(argv[i], uts.release, field); |
183 | } |
184 | } |
185 | |
186 | return 0; |
187 | } |
188 |