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      1 /* modinfo.c - Display module info
      2  *
      3  * Copyright 2012 Andre Renaud <andre (at) bluewatersys.com>
      4  *
      5  * TODO: cleanup
      6 
      7 USE_MODINFO(NEWTOY(modinfo, "<1b:k:F:0", TOYFLAG_BIN))
      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 *field;
     24   char *knam;
     25   char *base;
     26 
     27   long mod;
     28 )
     29 
     30 static 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 
     38 static 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 
     75 static 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 
    103 void 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