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    Contents of /tags/mkinitrd-6_3_0/busybox/modutils/modinfo.c

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    Revision 1139 - (show annotations) (download)
    Thu Aug 19 10:14:02 2010 UTC (13 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 3964 byte(s) 
    tagged 'mkinitrd-6_3_0'
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * modinfo - retrieve module info
    4 * Copyright (c) 2008 Pascal Bellard
    5 *
    6 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    7 */
    8
    9 //applet:IF_MODINFO(APPLET(modinfo, _BB_DIR_SBIN, _BB_SUID_DROP))
    10
    11 //kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o
    12
    13 //config:config MODINFO
    14 //config: bool "modinfo"
    15 //config: default y
    16 //config: help
    17 //config: Show information about a Linux Kernel module
    18
    19 #include <fnmatch.h>
    20 #include <sys/utsname.h> /* uname() */
    21 #include "libbb.h"
    22 #include "modutils.h"
    23
    24
    25 enum {
    26 OPT_TAGS = (1 << 6) - 1,
    27 OPT_F = (1 << 6), /* field name */
    28 OPT_0 = (1 << 7), /* \0 as separator */
    29 };
    30
    31 struct modinfo_env {
    32 char *field;
    33 int tags;
    34 };
    35
    36 static int display(const char *data, const char *pattern, int flag)
    37 {
    38 if (flag) {
    39 int n = printf("%s:", pattern);
    40 while (n++ < 16)
    41 bb_putchar(' ');
    42 }
    43 return printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
    44 }
    45
    46 static void modinfo(const char *path, const char *version,
    47 struct modinfo_env *env)
    48 {
    49 static const char *const shortcuts[] = {
    50 "filename",
    51 "description",
    52 "author",
    53 "license",
    54 "vermagic",
    55 "parm",
    56 };
    57 size_t len;
    58 int j, length;
    59 char *ptr, *the_module;
    60 const char *field = env->field;
    61 int tags = env->tags;
    62
    63 if (tags & 1) { /* filename */
    64 display(path, shortcuts[0], 1 != tags);
    65 }
    66
    67 len = MAXINT(ssize_t);
    68 the_module = xmalloc_open_zipped_read_close(path, &len);
    69 if (!the_module) {
    70 if (path[0] == '/')
    71 return;
    72 /* Newer depmod puts relative paths in modules.dep */
    73 path = xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, version, path);
    74 the_module = xmalloc_open_zipped_read_close(path, &len);
    75 free((char*)path);
    76 if (!the_module)
    77 return;
    78 }
    79
    80 if (field)
    81 tags |= OPT_F;
    82 for (j = 1; (1<<j) & (OPT_TAGS + OPT_F); j++) {
    83 const char *pattern = field;
    84 if ((1<<j) & OPT_TAGS)
    85 pattern = shortcuts[j];
    86 if (!((1<<j) & tags))
    87 continue;
    88 length = strlen(pattern);
    89 ptr = the_module;
    90 while (1) {
    91 ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
    92 if (ptr == NULL) /* no occurance left, done */
    93 break;
    94 if (strncmp(ptr, pattern, length) == 0 && ptr[length] == '=') {
    95 ptr += length + 1;
    96 ptr += display(ptr, pattern, (1<<j) != tags);
    97 }
    98 ++ptr;
    99 }
    100 }
    101 free(the_module);
    102 }
    103
    104 //usage:#define modinfo_trivial_usage
    105 //usage: "[-adlp0] [-F keyword] MODULE"
    106 //usage:#define modinfo_full_usage "\n\n"
    107 //usage: "Options:"
    108 //usage: "\n -a Shortcut for '-F author'"
    109 //usage: "\n -d Shortcut for '-F description'"
    110 //usage: "\n -l Shortcut for '-F license'"
    111 //usage: "\n -p Shortcut for '-F parm'"
    112 //usage: "\n -F keyword Keyword to look for"
    113 //usage: "\n -0 Separate output with NULs"
    114 //usage:#define modinfo_example_usage
    115 //usage: "$ modinfo -F vermagic loop\n"
    116
    117 int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    118 int modinfo_main(int argc UNUSED_PARAM, char **argv)
    119 {
    120 struct modinfo_env env;
    121 char name[MODULE_NAME_LEN];
    122 struct utsname uts;
    123 parser_t *parser;
    124 char *colon, *tokens[2];
    125 unsigned opts;
    126 unsigned i;
    127
    128 env.field = NULL;
    129 opt_complementary = "-1"; /* minimum one param */
    130 opts = getopt32(argv, "fdalvpF:0", &env.field);
    131 env.tags = opts & OPT_TAGS ? opts & OPT_TAGS : OPT_TAGS;
    132 argv += optind;
    133
    134 uname(&uts);
    135 parser = config_open2(
    136 xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, uts.release, CONFIG_DEFAULT_DEPMOD_FILE),
    137 xfopen_for_read
    138 );
    139
    140 while (config_read(parser, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
    141 colon = last_char_is(tokens[0], ':');
    142 if (colon == NULL)
    143 continue;
    144 *colon = '\0';
    145 filename2modname(tokens[0], name);
    146 for (i = 0; argv[i]; i++) {
    147 if (fnmatch(argv[i], name, 0) == 0) {
    148 modinfo(tokens[0], uts.release, &env);
    149 argv[i] = (char *) "";
    150 }
    151 }
    152 }
    153 if (ENABLE_FEATURE_CLEAN_UP)
    154 config_close(parser);
    155
    156 for (i = 0; argv[i]; i++) {
    157 if (argv[i][0]) {
    158 modinfo(argv[i], uts.release, &env);
    159 }
    160 }
    161
    162 return 0;
    163 }