1 /* modinfo.c - Display module info
2 *
3 * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
4 *
5 * TODO: cleanup
6
7 USE_MODINFO(NEWTOY(modinfo, "<1b:k:F:0", TOYFLAG_SBIN))
8
9 config 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
26 GLOBALS(
27 char *F, *k, *b;
28
29 long mod;
30 int count;
31 )
32
output_field(char * field,char * value)33 static 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
modinfo_file(char * full_name)41 static 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
check_module(struct dirtree * new)79 static 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
modinfo_main(void)107 void 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