grub-core/commands/minicmd.c

   1 /* minicmd.c - commands for the rescue mode */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2003,2005,2006,2007,2009  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/dl.h>
  21 #include <grub/mm.h>
  22 #include <grub/err.h>
  23 #include <grub/env.h>
  24 #include <grub/misc.h>
  25 #include <grub/file.h>
  26 #include <grub/disk.h>
  27 #include <grub/term.h>
  28 #include <grub/loader.h>
  29 #include <grub/command.h>
  30 #include <grub/i18n.h>
  31
  32 GRUB_MOD_LICENSE ("GPLv3+");
  33
  34 /* cat FILE */
  35 static grub_err_t
  36 grub_mini_cmd_cat (struct grub_command *cmd __attribute__ ((unused)),
  37                    int argc, char *argv[])
  38 {
  39   grub_file_t file;
  40   char buf[GRUB_DISK_SECTOR_SIZE];
  41   grub_ssize_t size;
  42
  43   if (argc < 1)
  44     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
  45
  46   file = grub_file_open (argv[0]);
  47   if (! file)
  48     return grub_errno;
  49
  50   while ((size = grub_file_read (file, buf, sizeof (buf))) > 0)
  51     {
  52       int i;
  53
  54       for (i = 0; i < size; i++)
  55         {
  56           unsigned char c = buf[i];
  57
  58           if ((grub_isprint (c) || grub_isspace (c)) && c != '\r')
  59             grub_printf ("%c", c);
  60           else
  61             {
  62               grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
  63               grub_printf ("<%x>", (int) c);
  64               grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
  65             }
  66         }
  67     }
  68
  69   grub_xputs ("\n");
  70   grub_refresh ();
  71   grub_file_close (file);
  72
  73   return 0;
  74 }
  75
  76 /* help */
  77 static grub_err_t
  78 grub_mini_cmd_help (struct grub_command *cmd __attribute__ ((unused)),
  79                     int argc __attribute__ ((unused)),
  80                     char *argv[] __attribute__ ((unused)))
  81 {
  82   grub_command_t p;
  83
  84   for (p = grub_command_list; p; p = p->next)
  85     grub_printf ("%s (%d%c)\t%s\n", p->name,
  86                  p->prio & GRUB_COMMAND_PRIO_MASK,
  87                  (p->prio & GRUB_COMMAND_FLAG_ACTIVE) ? '+' : '-',
  88                  p->description);
  89
  90   return 0;
  91 }
  92
  93 /* dump ADDRESS [SIZE] */
  94 static grub_err_t
  95 grub_mini_cmd_dump (struct grub_command *cmd __attribute__ ((unused)),
  96                     int argc, char *argv[])
  97 {
  98   grub_uint8_t *addr;
  99   grub_size_t size = 4;
 100
 101   if (argc == 0)
 102     return grub_error (GRUB_ERR_BAD_ARGUMENT, "no address specified");
 103
 104   addr = (grub_uint8_t *) grub_strtoul (argv[0], 0, 0);
 105   if (grub_errno)
 106     return grub_errno;
 107
 108   if (argc > 1)
 109     size = (grub_size_t) grub_strtoul (argv[1], 0, 0);
 110
 111   while (size--)
 112     {
 113       grub_printf ("%x%x ", *addr >> 4, *addr & 0xf);
 114       addr++;
 115     }
 116
 117   return 0;
 118 }
 119
 120 /* rmmod MODULE */
 121 static grub_err_t
 122 grub_mini_cmd_rmmod (struct grub_command *cmd __attribute__ ((unused)),
 123                      int argc, char *argv[])
 124 {
 125   grub_dl_t mod;
 126
 127   if (argc == 0)
 128     return grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified");
 129
 130   mod = grub_dl_get (argv[0]);
 131   if (! mod)
 132     return grub_error (GRUB_ERR_BAD_ARGUMENT, "no such module");
 133
 134   if (grub_dl_unref (mod) <= 0)
 135     grub_dl_unload (mod);
 136
 137   return 0;
 138 }
 139
 140 /* lsmod */
 141 static grub_err_t
 142 grub_mini_cmd_lsmod (struct grub_command *cmd __attribute__ ((unused)),
 143                      int argc __attribute__ ((unused)),
 144                      char *argv[] __attribute__ ((unused)))
 145 {
 146   grub_dl_t mod;
 147
 148   /* TRANSLATORS: this is module list header.  Name
 149      is module name, Ref Count is a reference counter
 150      (how many modules or open descriptors use it).
 151      Dependencies are the other modules it uses.
 152    */
 153   grub_printf_ (N_("Name\tRef Count\tDependencies\n"));
 154   FOR_DL_MODULES (mod)
 155   {
 156     grub_dl_dep_t dep;
 157
 158     grub_printf ("%s\t%d\t\t", mod->name, mod->ref_count);
 159     for (dep = mod->dep; dep; dep = dep->next)
 160       {
 161         if (dep != mod->dep)
 162           grub_xputs (",");
 163
 164         grub_printf ("%s", dep->mod->name);
 165       }
 166     grub_xputs ("\n");
 167   }
 168
 169   return 0;
 170 }
 171
 172 /* exit */
 173 static grub_err_t __attribute__ ((noreturn))
 174 grub_mini_cmd_exit (struct grub_command *cmd __attribute__ ((unused)),
 175                     int argc __attribute__ ((unused)),
 176                     char *argv[] __attribute__ ((unused)))
 177 {
 178   grub_exit ();
 179   /* Not reached.  */
 180 }
 181
 182 static grub_command_t cmd_cat, cmd_help;
 183 static grub_command_t cmd_dump, cmd_rmmod, cmd_lsmod, cmd_exit;
 184
 185 GRUB_MOD_INIT(minicmd)
 186 {
 187   cmd_cat =
 188     grub_register_command ("cat", grub_mini_cmd_cat,
 189                            N_("FILE"), N_("Show the contents of a file."));
 190   cmd_help =
 191     grub_register_command ("help", grub_mini_cmd_help,
 192                            0, N_("Show this message."));
 193   cmd_dump =
 194     grub_register_command ("dump", grub_mini_cmd_dump,
 195                            N_("ADDR [SIZE]"), N_("Show memory contents."));
 196   cmd_rmmod =
 197     grub_register_command ("rmmod", grub_mini_cmd_rmmod,
 198                            N_("MODULE"), N_("Remove a module."));
 199   cmd_lsmod =
 200     grub_register_command ("lsmod", grub_mini_cmd_lsmod,
 201                            0, N_("Show loaded modules."));
 202   cmd_exit =
 203     grub_register_command ("exit", grub_mini_cmd_exit,
 204                            0, N_("Exit from GRUB."));
 205 }
 206
 207 GRUB_MOD_FINI(minicmd)
 208 {
 209   grub_unregister_command (cmd_cat);
 210   grub_unregister_command (cmd_help);
 211   grub_unregister_command (cmd_dump);
 212   grub_unregister_command (cmd_rmmod);
 213   grub_unregister_command (cmd_lsmod);
 214   grub_unregister_command (cmd_exit);
 215 }