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/* vi: set sw=4 ts=4: */
/*
* modinfo - retrieve module info
* Copyright (c) 2008 Pascal Bellard
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config MODINFO
//config: bool "modinfo (24 kb)"
//config: default y
//config: help
//config: Show information about a Linux Kernel module
//applet:IF_MODINFO(APPLET_NOEXEC(modinfo, modinfo, BB_DIR_SBIN, BB_SUID_DROP, modinfo))
//kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o
#include <fnmatch.h>
#include <sys/utsname.h> /* uname() */
#include "libbb.h"
#include "modutils.h"
static const char *const shortcuts[] ALIGN_PTR = {
"filename", // -n
"author", // -a
"description", // -d
"license", // -l
"parm", // -p
"version", // the rest has no shortcut options
"alias",
"srcversion",
"depends",
"uts_release",
"intree",
"vermagic",
"firmware",
};
enum {
OPT_0 = (1 << 0), /* \0 as separator */
OPT_F = (1 << 1), /* field name */
/* first bits are for -nadlp options, the rest are for
* fields not selectable with "shortcut" options
*/
OPT_n = (1 << 2),
OPT_TAGS = ((1 << ARRAY_SIZE(shortcuts)) - 1) << 2,
};
static void display(const char *data, const char *pattern)
{
int flag = option_mask32 >> 1; /* shift out -0 bit */
if (flag & (flag-1)) {
/* more than one field to show: print "FIELD:" pfx */
int n = printf("%s:", pattern);
while (n++ < 16)
bb_putchar(' ');
}
printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
}
static void modinfo(const char *path, const char *version,
const char *field)
{
size_t len;
int j;
char *ptr, *the_module;
char *allocated;
int tags = option_mask32;
allocated = NULL;
len = MAXINT(ssize_t);
the_module = xmalloc_open_zipped_read_close(path, &len);
if (!the_module) {
if (path[0] == '/')
return;
/* Newer depmod puts relative paths in modules.dep */
path = allocated = xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, version, path);
the_module = xmalloc_open_zipped_read_close(path, &len);
if (!the_module) {
bb_error_msg("module '%s' not found", path);
goto ret;
}
}
for (j = 1; (1<<j) & (OPT_TAGS|OPT_F); j++) {
const char *pattern;
if (!((1<<j) & tags))
continue;
pattern = field;
if ((1<<j) & OPT_TAGS)
pattern = shortcuts[j-2];
if (strcmp(pattern, shortcuts[0]) == 0) {
/* "-n" or "-F filename" */
display(path, shortcuts[0]);
continue;
}
ptr = the_module;
while (1) {
char *after_pattern;
ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
if (ptr == NULL) /* no occurrence left, done */
break;
after_pattern = is_prefixed_with(ptr, pattern);
if (after_pattern && *after_pattern == '=') {
/* field prefixes are 0x80 or 0x00 */
if ((ptr[-1] & 0x7F) == 0x00) {
ptr = after_pattern + 1;
display(ptr, pattern);
ptr += strlen(ptr);
}
}
++ptr;
}
}
free(the_module);
ret:
free(allocated);
}
//usage:#define modinfo_trivial_usage
//usage: "[-adlpn0] [-F keyword] MODULE"
//usage:#define modinfo_full_usage "\n\n"
//usage: " -a Shortcut for '-F author'"
//usage: "\n -d Shortcut for '-F description'"
//usage: "\n -l Shortcut for '-F license'"
//usage: "\n -p Shortcut for '-F parm'"
////usage: "\n -n Shortcut for '-F filename'"
//usage: "\n -F keyword Keyword to look for"
//usage: "\n -0 Separate output with NULs"
//usage:#define modinfo_example_usage
//usage: "$ modinfo -F vermagic loop\n"
int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int modinfo_main(int argc UNUSED_PARAM, char **argv)
{
const char *field;
char name[MODULE_NAME_LEN];
struct utsname uts;
parser_t *parser;
char *colon, *tokens[2];
unsigned opts;
unsigned i;
field = NULL;
opts = getopt32(argv, "^" "0F:nadlp" "\0" "-1"/*minimum one arg*/, &field);
/* If no field selected, show all */
if (!(opts & (OPT_TAGS|OPT_F)))
option_mask32 |= OPT_TAGS;
argv += optind;
uname(&uts);
parser = config_open2(
xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, uts.release, CONFIG_DEFAULT_DEPMOD_FILE),
xfopen_for_read
);
while (config_read(parser, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
colon = last_char_is(tokens[0], ':');
if (colon == NULL)
continue;
*colon = '\0';
filename2modname(bb_basename(tokens[0]), name);
for (i = 0; argv[i]; i++) {
if (fnmatch(argv[i], name, 0) == 0) {
modinfo(tokens[0], uts.release, field);
argv[i] = (char *) "";
}
}
}
if (ENABLE_FEATURE_CLEAN_UP)
config_close(parser);
for (i = 0; argv[i]; i++) {
if (argv[i][0]) {
modinfo(argv[i], uts.release, field);
}
}
return 0;
}
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