/* 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; }