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 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
22 GLOBALS(
23 char *F, *k, *b;
24
25 long mod;
26 )
27
output_field(char * field,char * value)28 static 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
modinfo_file(char * full_name)36 static 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<ARRAY_LEN(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
check_module(struct dirtree * new)73 static 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
modinfo_main(void)101 void 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