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_BIN))
   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 *field;
  24  char *knam;
  25  char *base;
  26
  27  long mod;
  28)
  29
  30static void output_field(char *field, char *value)
  31{
  32  if (!TT.field) xprintf("%s:%*c", field, 15-(int)strlen(field), ' ');
  33  else if (strcmp(TT.field, field)) return;
  34  xprintf("%s", value);
  35  xputc((toys.optflags & FLAG_0) ? 0 : '\n');
  36}
  37
  38static void modinfo_file(char *full_name)
  39{
  40  int fd, len, i;
  41  char *buf = 0, *pos, *modinfo_tags[] = {
  42    "alias", "license", "description", "author", "firmware",
  43    "vermagic", "srcversion", "intree", "depends", "parm",
  44    "parmtype",
  45  };
  46
  47  if (-1 != (fd = open(full_name, O_RDONLY))) {
  48    len = fdlength(fd);
  49    buf = xmmap(0, len, PROT_READ, MAP_SHARED, fd, 0);
  50    close(fd);
  51  }
  52
  53  if (!buf) {
  54    perror_msg_raw(full_name);
  55    return;
  56  } 
  57
  58  output_field("filename", full_name);
  59
  60  for (pos = buf; pos < buf+len; pos++) {
  61    if (*pos) continue;
  62
  63    for (i = 0; i < sizeof(modinfo_tags) / sizeof(*modinfo_tags); i++) {
  64      char *str = modinfo_tags[i];
  65      int len = strlen(str);
  66
  67      if (!strncmp(pos+1, str, len) && pos[len+1] == '=') 
  68        output_field(str, pos+len+2);
  69    }
  70  }
  71
  72  munmap(buf, len);
  73}
  74
  75static int check_module(struct dirtree *new)
  76{
  77  if (!dirtree_notdotdot(new)) return 0;
  78
  79  if (S_ISREG(new->st.st_mode)) {
  80    char *s;
  81
  82    for (s = toys.optargs[TT.mod]; *s; s++) {
  83      int len = 0;
  84
  85      // The kernel treats - and _ the same, so we should too.
  86      for (len = 0; s[len]; len++) {
  87        if (s[len] == '-' && new->name[len] == '_') continue;
  88        if (s[len] == '_' && new->name[len] == '-') continue;
  89        if (s[len] != new->name[len]) break;
  90      }
  91      if (s[len] || strcmp(new->name+len, ".ko")) break;
  92
  93      modinfo_file(s = dirtree_path(new, 0));
  94      free(s);
  95
  96      return DIRTREE_ABORT;
  97    }
  98  }
  99
 100  return DIRTREE_RECURSE;
 101}
 102
 103void modinfo_main(void)
 104{
 105  for(TT.mod = 0; TT.mod<toys.optc; TT.mod++) {
 106    char *s = strstr(toys.optargs[TT.mod], ".ko");
 107
 108    if (s && !s[3]) modinfo_file(toys.optargs[TT.mod]);
 109    else {
 110      struct utsname uts;
 111
 112      if (uname(&uts) < 0) perror_exit("bad uname");
 113      if (snprintf(toybuf, sizeof(toybuf), "%s/lib/modules/%s",
 114          (toys.optflags & FLAG_b) ? TT.base : "",
 115          (toys.optflags & FLAG_k) ? TT.knam : uts.release) >= sizeof(toybuf))
 116            perror_exit("basedir/kernrelease too long");
 117      dirtree_read(toybuf, check_module);
 118    }
 119  }
 120}
 121