modutils/lsmod.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini lsmod implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
   7  *
   8  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9  */
  10
  11 //applet:IF_LSMOD(APPLET(lsmod, BB_DIR_SBIN, BB_SUID_DROP))
  12
  13 //usage:#if !ENABLE_MODPROBE_SMALL
  14 //usage:#define lsmod_trivial_usage
  15 //usage:       ""
  16 //usage:#define lsmod_full_usage "\n\n"
  17 //usage:       "List the currently loaded kernel modules"
  18 //usage:#endif
  19
  20 #include "libbb.h"
  21 #include "unicode.h"
  22
  23 #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
  24 enum {
  25         TAINT_PROPRIETORY_MODULE = (1 << 0),
  26         TAINT_FORCED_MODULE      = (1 << 1),
  27         TAINT_UNSAFE_SMP         = (1 << 2),
  28 };
  29
  30 static void check_tainted(void)
  31 {
  32         int tainted = 0;
  33         char *buf = xmalloc_open_read_close("/proc/sys/kernel/tainted", NULL);
  34         if (buf) {
  35                 tainted = atoi(buf);
  36                 if (ENABLE_FEATURE_CLEAN_UP)
  37                         free(buf);
  38         }
  39
  40         if (tainted) {
  41                 printf("    Tainted: %c%c%c\n",
  42                                 tainted & TAINT_PROPRIETORY_MODULE      ? 'P' : 'G',
  43                                 tainted & TAINT_FORCED_MODULE           ? 'F' : ' ',
  44                                 tainted & TAINT_UNSAFE_SMP              ? 'S' : ' ');
  45         } else {
  46                 puts("    Not tainted");
  47         }
  48 }
  49 #else
  50 static void check_tainted(void) { putchar('\n'); }
  51 #endif
  52
  53 int lsmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  54 int lsmod_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  55 {
  56 #if ENABLE_FEATURE_LSMOD_PRETTY_2_6_OUTPUT
  57         char *token[4];
  58         parser_t *parser = config_open("/proc/modules");
  59         init_unicode();
  60
  61         printf("%-24sSize  Used by", "Module");
  62         check_tainted();
  63
  64         if (ENABLE_FEATURE_2_4_MODULES
  65          && get_linux_version_code() < KERNEL_VERSION(2,6,0)
  66         ) {
  67                 while (config_read(parser, token, 4, 3, "# \t", PARSE_NORMAL)) {
  68                         if (token[3] != NULL && token[3][0] == '[') {
  69                                 token[3]++;
  70                                 token[3][strlen(token[3])-1] = '\0';
  71                         } else
  72                                 token[3] = (char *) "";
  73 # if ENABLE_UNICODE_SUPPORT
  74                         {
  75                                 uni_stat_t uni_stat;
  76                                 char *uni_name = unicode_conv_to_printable(&uni_stat, token[0]);
  77                                 unsigned pad_len = (uni_stat.unicode_width > 19) ? 0 : 19 - uni_stat.unicode_width;
  78                                 printf("%s%*s %8s %2s %s\n", uni_name, pad_len, "", token[1], token[2], token[3]);
  79                                 free(uni_name);
  80                         }
  81 # else
  82                         printf("%-19s %8s %2s %s\n", token[0], token[1], token[2], token[3]);
  83 # endif
  84                 }
  85         } else {
  86                 while (config_read(parser, token, 4, 4, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
  87                         // N.B. token[3] is either '-' (module is not used by others)
  88                         // or comma-separated list ended by comma
  89                         // so trimming the trailing char is just what we need!
  90                         if (token[3][0])
  91                                 token[3][strlen(token[3]) - 1] = '\0';
  92 # if ENABLE_UNICODE_SUPPORT
  93                         {
  94                                 uni_stat_t uni_stat;
  95                                 char *uni_name = unicode_conv_to_printable(&uni_stat, token[0]);
  96                                 unsigned pad_len = (uni_stat.unicode_width > 19) ? 0 : 19 - uni_stat.unicode_width;
  97                                 printf("%s%*s %8s %2s %s\n", uni_name, pad_len, "", token[1], token[2], token[3]);
  98                                 free(uni_name);
  99                         }
 100 # else
 101                         printf("%-19s %8s %2s %s\n", token[0], token[1], token[2], token[3]);
 102 # endif
 103                 }
 104         }
 105         if (ENABLE_FEATURE_CLEAN_UP)
 106                 config_close(parser);
 107 #else
 108         check_tainted();
 109         xprint_and_close_file(xfopen_for_read("/proc/modules"));
 110 #endif
 111         return EXIT_SUCCESS;
 112 }