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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 tarball for details.
*/
//applet:IF_MODINFO(APPLET(modinfo, _BB_DIR_SBIN, _BB_SUID_DROP))
//kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o
//config:config MODINFO
//config: bool "modinfo"
//config: default y
//config: help
//config: Show information about a Linux Kernel module
#include <fnmatch.h>
#include <sys/utsname.h> /* uname() */
#include "libbb.h"
#include "modutils.h"
enum {
OPT_TAGS = (1 << 6) - 1,
OPT_F = (1 << 6), /* field name */
OPT_0 = (1 << 7), /* \0 as separator */
};
struct modinfo_env {
char *field;
int tags;
};
static int display(const char *data, const char *pattern, int flag)
{
if (flag) {
int n = printf("%s:", pattern);
while (n++ < 16)
bb_putchar(' ');
}
return printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
}
static void modinfo(const char *path, struct modinfo_env *env)
{
static const char *const shortcuts[] = {
"filename",
"description",
"author",
"license",
"vermagic",
"parm",
};
size_t len;
int j, length;
char *ptr, *the_module;
const char *field = env->field;
int tags = env->tags;
if (tags & 1) { /* filename */
display(path, shortcuts[0], 1 != tags);
}
len = MAXINT(ssize_t);
the_module = xmalloc_open_zipped_read_close(path, &len);
if (!the_module)
return;
if (field)
tags |= OPT_F;
for (j = 1; (1<<j) & (OPT_TAGS + OPT_F); j++) {
const char *pattern = field;
if ((1<<j) & OPT_TAGS)
pattern = shortcuts[j];
if (!((1<<j) & tags))
continue;
length = strlen(pattern);
ptr = the_module;
while (1) {
ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
if (ptr == NULL) /* no occurance left, done */
break;
if (strncmp(ptr, pattern, length) == 0 && ptr[length] == '=') {
ptr += length + 1;
ptr += display(ptr, pattern, (1<<j) != tags);
}
++ptr;
}
}
free(the_module);
}
//usage:#define modinfo_trivial_usage
//usage: "[-adlp0] [-F keyword] MODULE"
//usage:#define modinfo_full_usage "\n\n"
//usage: "Options:"
//usage: "\n -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 -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)
{
struct modinfo_env env;
char name[MODULE_NAME_LEN];
struct utsname uts;
parser_t *p;
char *colon, *tokens[2];
unsigned opts;
unsigned i;
env.field = NULL;
opt_complementary = "-1"; /* minimum one param */
opts = getopt32(argv, "fdalvpF:0", &env.field);
env.tags = opts & OPT_TAGS ? opts & OPT_TAGS : OPT_TAGS;
argv += optind;
uname(&uts);
p = config_open2(
concat_path_file(
concat_path_file(CONFIG_DEFAULT_MODULES_DIR, uts.release),
CONFIG_DEFAULT_DEPMOD_FILE),
xfopen_for_read
);
while (config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
colon = last_char_is(tokens[0], ':');
if (colon == NULL)
continue;
*colon = '\0';
filename2modname(tokens[0], name);
for (i = 0; argv[i]; i++) {
if (fnmatch(argv[i], name, 0) == 0) {
modinfo(tokens[0], &env);
argv[i] = (char *) "";
}
}
}
for (i = 0; argv[i]; i++) {
if (argv[i][0]) {
modinfo(argv[i], &env);
}
}
return 0;
}
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