| /* 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 (25 kb)" |
| //config: default y |
| //config: select PLATFORM_LINUX |
| //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[] = { |
| "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; |
| } |