22bdf9033
Pascal Bellard
2010-06-06
Subject
modinfo: new applet
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modutils/Config.src+2 -0
| @@ -5,6 +5,8 @@ | |
| menu "Linux Module Utilities" | |
| + | INSERT |
| + | |
| config MODPROBE_SMALL | |
| bool "Simplified modutils" | |
| default y | |
modutils/Kbuild.src+1 -0
| @@ -5,6 +5,7 @@ | |
| # Licensed under the GPL v2, see the file LICENSE in this tarball. | |
| lib-y:= | |
| + | INSERT |
| lib-$(CONFIG_MODPROBE_SMALL) += modprobe-small.o | |
| lib-$(CONFIG_DEPMOD) += depmod.o modutils.o | |
| lib-$(CONFIG_INSMOD) += insmod.o modutils.o | |
modutils/modinfo.c+150 -0
| @@ -0,0 +1,150 @@ | |
| + | /* vi: set sw=4 ts=4: */ |
| + | /* |
| + | * modinfo - retrieve module info |
| + | * Copyright (c) 2008 Pascal Bellard |
| + | * |
| + | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| + | */ |
| + | |
| + | //applet:IF_MODINFO(APPLET(modinfo, _BB_DIR_SBIN, _BB_SUID_DROP)) |
| + | |
| + | //kbuild:lib-$(CONFIG_MODINFO) += modinfo.o |
| + | |
| + | //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; |
| + | } |