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 kernrelease] [-F field] [modulename...]
  14
  15    Display module fields for all specified modules, looking in
  16    <basedir>/lib/modules/<kernrelease>/ (kernrelease defaults to uname -r).
  17*/
  18
  19#define FOR_modinfo
  20#include "toys.h"
  21
  22GLOBALS(
  23  char *F, *k, *b;
  24
  25  long mod;
  26)
  27
  28static void output_field(char *field, char *value)
  29{
  30  if (!TT.F) xprintf("%s:%*c", field, 15-(int)strlen(field), ' ');
  31  else if (strcmp(TT.F, field)) return;
  32  xprintf("%s", value);
  33  xputc((toys.optflags & FLAG_0) ? 0 : '\n');
  34}
  35
  36static void modinfo_file(char *full_name)
  37{
  38  int fd, len, i;
  39  char *buf = 0, *pos, *modinfo_tags[] = {
  40    "alias", "license", "description", "author", "firmware",
  41    "vermagic", "srcversion", "intree", "depends", "parm",
  42    "parmtype",
  43  };
  44
  45  if (-1 != (fd = open(full_name, O_RDONLY))) {
  46    len = fdlength(fd);
  47    buf = xmmap(0, len, PROT_READ, MAP_SHARED, fd, 0);
  48    close(fd);
  49  }
  50
  51  if (!buf) {
  52    perror_msg_raw(full_name);
  53    return;
  54  } 
  55
  56  output_field("filename", full_name);
  57
  58  for (pos = buf; pos < buf+len; pos++) {
  59    if (*pos) continue;
  60
  61    for (i = 0; i < sizeof(modinfo_tags) / sizeof(*modinfo_tags); i++) {
  62      char *str = modinfo_tags[i];
  63      int len = strlen(str);
  64
  65      if (!strncmp(pos+1, str, len) && pos[len+1] == '=') 
  66        output_field(str, pos+len+2);
  67    }
  68  }
  69
  70  munmap(buf, len);
  71}
  72
  73static int check_module(struct dirtree *new)
  74{
  75  if (!dirtree_notdotdot(new)) return 0;
  76
  77  if (S_ISREG(new->st.st_mode)) {
  78    char *s;
  79
  80    for (s = toys.optargs[TT.mod]; *s; s++) {
  81      int len = 0;
  82
  83      // The kernel treats - and _ the same, so we should too.
  84      for (len = 0; s[len]; len++) {
  85        if (s[len] == '-' && new->name[len] == '_') continue;
  86        if (s[len] == '_' && new->name[len] == '-') continue;
  87        if (s[len] != new->name[len]) break;
  88      }
  89      if (s[len] || strcmp(new->name+len, ".ko")) break;
  90
  91      modinfo_file(s = dirtree_path(new, 0));
  92      free(s);
  93
  94      return DIRTREE_ABORT;
  95    }
  96  }
  97
  98  return DIRTREE_RECURSE;
  99}
 100
 101void modinfo_main(void)
 102{
 103  for(TT.mod = 0; TT.mod<toys.optc; TT.mod++) {
 104    char *s = strstr(toys.optargs[TT.mod], ".ko");
 105
 106    if (s && !s[3]) modinfo_file(toys.optargs[TT.mod]);
 107    else {
 108      struct utsname uts;
 109
 110      if (uname(&uts) < 0) perror_exit("bad uname");
 111      if (snprintf(toybuf, sizeof(toybuf), "%s/lib/modules/%s",
 112          (toys.optflags & FLAG_b) ? TT.b : "",
 113          (toys.optflags & FLAG_k) ? TT.k : uts.release) >= sizeof(toybuf))
 114            perror_exit("basedir/kernrelease too long");
 115      dirtree_read(toybuf, check_module);
 116    }
 117  }
 118}
 119