LXR toybox/toys/other/modinfo.c

   1/* modinfo.c - Display module info
   2 *
   3 * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
   4 *
   5 * TODO: cleanup
   6
   7USE_MODINFO(NEWTOY(modinfo, "<1b:k:F:0", TOYFLAG_SBIN))
   8
   9config MODINFO
  10  bool "modinfo"
  11  default y
  12  help
  13    usage: modinfo [-0] [-b basedir] [-k kernel] [-F field] [module|file...]
  14
  15    Display module fields for modules specified by name or .ko path.
  16
  17    -F  Only show the given field
  18    -0  Separate fields with NUL rather than newline
  19    -b  Use <basedir> as root for /lib/modules/
  20    -k  Look in given directory under /lib/modules/
  21*/
  22
  23#define FOR_modinfo
  24#include "toys.h"
  25
  26GLOBALS(
  27  char *F, *k, *b;
  28
  29  long mod;
  30  int count;
  31)
  32
  33static void output_field(char *field, char *value)
  34{
  35  if (!TT.F) xprintf("%s:%*c", field, 15-(int)strlen(field), ' ');
  36  else if (strcmp(TT.F, field)) return;
  37  xprintf("%s", value);
  38  xputc(FLAG(0) ? 0 : '\n');
  39}
  40
  41static void modinfo_file(char *full_name)
  42{
  43  int fd, flen, i;
  44  char *buf = 0, *end, *modinfo_tags[] = {
  45    "license", "author", "description", "firmware", "alias", "srcversion",
  46    "depends", "retpoline", "intree", "name", "vermagic", "parm", "parmtype",
  47  };
  48
  49  if (-1 != (fd = open(full_name, O_RDONLY))) {
  50    flen = fdlength(fd);
  51    buf = xmmap(0, flen, PROT_READ, MAP_SHARED, fd, 0);
  52    end = buf + flen;
  53    close(fd);
  54  }
  55
  56  if (!buf) {
  57    perror_msg_raw(full_name);
  58    return;
  59  }
  60
  61  TT.count++;
  62  output_field("filename", full_name);
  63
  64  for (i=0; i<ARRAY_LEN(modinfo_tags); i++) {
  65    char *field = modinfo_tags[i], *p = buf;
  66    int slen = sprintf(toybuf, "%s=", field);
  67
  68    while (p && p < end) {
  69      p = memmem(p, end-p, toybuf, slen);
  70      if (p) output_field(field, p += slen);
  71    }
  72  }
  73
  74  munmap(buf, flen);
  75}
  76
  77static int check_module(struct dirtree *new)
  78{
  79  char *s;
  80  int len;
  81
  82  if (!dirtree_notdotdot(new)) return 0;
  83
  84  if (!S_ISREG(new->st.st_mode)) return DIRTREE_RECURSE;
  85
  86  s = toys.optargs[TT.mod];
  87
  88  // The kernel treats - and _ the same, so we should too.
  89  for (len = 0; s[len]; len++) {
  90    if (s[len] == '-' && new->name[len] == '_') continue;
  91    if (s[len] == '_' && new->name[len] == '-') continue;
  92    if (s[len] != new->name[len]) break;
  93  }
  94  if (s[len] || strcmp(new->name+len, ".ko")) return DIRTREE_RECURSE;
  95
  96  modinfo_file(s = dirtree_path(new, 0));
  97  free(s);
  98
  99  return DIRTREE_ABORT;
 100}
 101
 102void modinfo_main(void)
 103{
 104  struct utsname uts;
 105
 106  // Android (as shipped by Google) currently only has modules on /vendor.
 107  // Android does not support multiple sets of modules for different kernels.
 108  if (CFG_TOYBOX_ON_ANDROID) {
 109   if (!TT.b) TT.b = "/vendor";
 110   if (!TT.k) TT.k = "";
 111  } else {
 112   uname(&uts);
 113   if (!TT.b) TT.b = "";
 114   if (!TT.k) TT.k = uts.release;
 115  }
 116
 117  for (TT.mod = 0; TT.mod<toys.optc; TT.mod++) {
 118    if (strend(toys.optargs[TT.mod], ".ko")) modinfo_file(toys.optargs[TT.mod]);
 119    else {
 120      char *path = xmprintf("%s/lib/modules/%s", TT.b, TT.k);
 121
 122      TT.count = 0;
 123      dirtree_read(path, check_module);
 124      if (!TT.count) error_msg("%s: not found", toys.optargs[TT.mod]);
 125      free(path);
 126    }
 127  }
 128}
 129