xref: /third_party/toybox/toys/other/modinfo.c (revision 0f66f451) 
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, len, i;
44  char *buf = 0, *pos, *modinfo_tags[] = {
45    "alias", "license", "description", "author", "firmware",
46    "vermagic", "srcversion", "intree", "depends", "parm",
47    "parmtype",
48  };
49
50  if (-1 != (fd = open(full_name, O_RDONLY))) {
51    len = fdlength(fd);
52    buf = xmmap(0, len, PROT_READ, MAP_SHARED, fd, 0);
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 (pos = buf; pos < buf+len; pos++) {
65    if (*pos) continue;
66
67    for (i=0; i<ARRAY_LEN(modinfo_tags); i++) {
68      char *str = modinfo_tags[i];
69      int len = strlen(str);
70
71      if (!strncmp(pos+1, str, len) && pos[len+1] == '=')
72        output_field(str, pos+len+2);
73    }
74  }
75
76  munmap(buf, len);
77}
78
79static int check_module(struct dirtree *new)
80{
81  if (!dirtree_notdotdot(new)) return 0;
82
83  if (S_ISREG(new->st.st_mode)) {
84    char *s;
85
86    for (s = toys.optargs[TT.mod]; *s; s++) {
87      int len = 0;
88
89      // The kernel treats - and _ the same, so we should too.
90      for (len = 0; s[len]; len++) {
91        if (s[len] == '-' && new->name[len] == '_') continue;
92        if (s[len] == '_' && new->name[len] == '-') continue;
93        if (s[len] != new->name[len]) break;
94      }
95      if (s[len] || strcmp(new->name+len, ".ko")) break;
96
97      modinfo_file(s = dirtree_path(new, 0));
98      free(s);
99
100      return DIRTREE_ABORT;
101    }
102  }
103
104  return DIRTREE_RECURSE;
105}
106
107void modinfo_main(void)
108{
109  struct utsname uts;
110
111  // Android (as shipped by Google) currently only has modules on /vendor.
112  // Android does not support multiple sets of modules for different kernels.
113  if (CFG_TOYBOX_ON_ANDROID) {
114   if (!TT.b) TT.b = "/vendor";
115   if (!TT.k) TT.k = "";
116  } else {
117   uname(&uts);
118   if (!TT.b) TT.b = "";
119   if (!TT.k) TT.k = uts.release;
120  }
121
122  for (TT.mod = 0; TT.mod<toys.optc; TT.mod++) {
123    char *s = strstr(toys.optargs[TT.mod], ".ko");
124
125    if (s && !s[3]) modinfo_file(toys.optargs[TT.mod]);
126    else {
127      char *path = xmprintf("%s/lib/modules/%s", TT.b, TT.k);
128
129      TT.count = 0;
130      dirtree_read(path, check_module);
131      if (!TT.count) error_msg("%s: not found", toys.optargs[TT.mod]);
132      free(path);
133    }
134  }
135}
136