GRUB2/MOD_SRC/grub-2.04/grub-core/commands/menuentry.c

   1 /* menuentry.c - menuentry command */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2010  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/types.h>
  21 #include <grub/misc.h>
  22 #include <grub/err.h>
  23 #include <grub/dl.h>
  24 #include <grub/extcmd.h>
  25 #include <grub/i18n.h>
  26 #include <grub/normal.h>
  27
  28 static const struct grub_arg_option options[] =
  29   {
  30     {"class", 1, GRUB_ARG_OPTION_REPEATABLE,
  31      N_("Menu entry type."), N_("STRING"), ARG_TYPE_STRING},
  32     {"users", 2, 0,
  33      N_("List of users allowed to boot this entry."), N_("USERNAME[,USERNAME]"),
  34      ARG_TYPE_STRING},
  35     {"hotkey", 3, 0,
  36      N_("Keyboard key to quickly boot this entry."), N_("KEYBOARD_KEY"), ARG_TYPE_STRING},
  37     {"source", 4, 0,
  38      N_("Use STRING as menu entry body."), N_("STRING"), ARG_TYPE_STRING},
  39     {"id", 0, 0, N_("Menu entry identifier."), N_("STRING"), ARG_TYPE_STRING},
  40     /* TRANSLATORS: menu entry can either be bootable by anyone or only by
  41        handful of users. By default when security is active only superusers can
  42        boot a given menu entry. With --unrestricted (this option)
  43        anyone can boot it.  */
  44     {"unrestricted", 0, 0, N_("This entry can be booted by any user."),
  45      0, ARG_TYPE_NONE},
  46     {0, 0, 0, 0, 0, 0}
  47   };
  48
  49 static struct
  50 {
  51   const char *name;
  52   int key;
  53 } hotkey_aliases[] =
  54   {
  55     {"backspace", GRUB_TERM_BACKSPACE},
  56     {"tab", GRUB_TERM_TAB},
  57     {"delete", GRUB_TERM_KEY_DC},
  58     {"insert", GRUB_TERM_KEY_INSERT},
  59     {"f1", GRUB_TERM_KEY_F1},
  60     {"f2", GRUB_TERM_KEY_F2},
  61     {"f3", GRUB_TERM_KEY_F3},
  62     {"f4", GRUB_TERM_KEY_F4},
  63     {"f5", GRUB_TERM_KEY_F5},
  64     {"f6", GRUB_TERM_KEY_F6},
  65     {"f7", GRUB_TERM_KEY_F7},
  66     {"f8", GRUB_TERM_KEY_F8},
  67     {"f9", GRUB_TERM_KEY_F9},
  68     {"f10", GRUB_TERM_KEY_F10},
  69     {"f11", GRUB_TERM_KEY_F11},
  70     {"f12", GRUB_TERM_KEY_F12},
  71   };
  72
  73 /* Add a menu entry to the current menu context (as given by the environment
  74    variable data slot `menu').  As the configuration file is read, the script
  75    parser calls this when a menu entry is to be created.  */
  76 grub_err_t
  77 grub_normal_add_menu_entry (int argc, const char **args,
  78                             char **classes, const char *id,
  79                             const char *users, const char *hotkey,
  80                             const char *prefix, const char *sourcecode,
  81                             int submenu, int *index, struct bls_entry *bls)
  82 {
  83   int menu_hotkey = 0;
  84   char **menu_args = NULL;
  85   char *menu_users = NULL;
  86   char *menu_title = NULL;
  87   char *menu_sourcecode = NULL;
  88   char *menu_id = NULL;
  89   struct grub_menu_entry_class *menu_classes = NULL;
  90
  91   grub_menu_t menu;
  92   grub_menu_entry_t *last;
  93
  94   menu = grub_env_get_menu ();
  95   if (! menu)
  96     return grub_error (GRUB_ERR_MENU, "no menu context");
  97
  98   last = &menu->entry_list;
  99
 100   menu_sourcecode = grub_xasprintf ("%s%s", prefix ?: "", sourcecode);
 101   if (! menu_sourcecode)
 102     return grub_errno;
 103
 104   if (classes && classes[0])
 105     {
 106       int i;
 107       for (i = 0; classes[i]; i++); /* count # of menuentry classes */
 108       menu_classes = grub_zalloc (sizeof (struct grub_menu_entry_class)
 109                                   * (i + 1));
 110       if (! menu_classes)
 111         goto fail;
 112
 113       for (i = 0; classes[i]; i++)
 114         {
 115           menu_classes[i].name = grub_strdup (classes[i]);
 116           if (! menu_classes[i].name)
 117             goto fail;
 118           menu_classes[i].next = classes[i + 1] ? &menu_classes[i + 1] : NULL;
 119         }
 120     }
 121
 122   if (users)
 123     {
 124       menu_users = grub_strdup (users);
 125       if (! menu_users)
 126         goto fail;
 127     }
 128
 129   if (hotkey)
 130     {
 131       unsigned i;
 132       for (i = 0; i < ARRAY_SIZE (hotkey_aliases); i++)
 133         if (grub_strcmp (hotkey, hotkey_aliases[i].name) == 0)
 134           {
 135             menu_hotkey = hotkey_aliases[i].key;
 136             break;
 137           }
 138       if (i == ARRAY_SIZE (hotkey_aliases))
 139         menu_hotkey = hotkey[0];
 140     }
 141
 142   if (! argc)
 143     {
 144       grub_error (GRUB_ERR_MENU, "menuentry is missing title");
 145       goto fail;
 146     }
 147
 148   menu_title = grub_strdup (args[0]);
 149   if (! menu_title)
 150     goto fail;
 151
 152   grub_dprintf ("menu", "id:\"%s\"\n", id);
 153   grub_dprintf ("menu", "title:\"%s\"\n", menu_title);
 154   menu_id = grub_strdup (id ? : menu_title);
 155   if (! menu_id)
 156     goto fail;
 157   grub_dprintf ("menu", "menu_id:\"%s\"\n", menu_id);
 158
 159   /* Save argc, args to pass as parameters to block arg later. */
 160   menu_args = grub_malloc (sizeof (char*) * (argc + 1));
 161   if (! menu_args)
 162     goto fail;
 163
 164   {
 165     int i;
 166     for (i = 0; i < argc; i++)
 167       {
 168         menu_args[i] = grub_strdup (args[i]);
 169         if (! menu_args[i])
 170           goto fail;
 171       }
 172     menu_args[argc] = NULL;
 173   }
 174
 175   /* Add the menu entry at the end of the list.  */
 176   int ind=0;
 177   while (*last)
 178     {
 179       ind++;
 180       last = &(*last)->next;
 181     }
 182
 183   *last = grub_zalloc (sizeof (**last));
 184   if (! *last)
 185     goto fail;
 186
 187   (*last)->title = menu_title;
 188   (*last)->id = menu_id;
 189   (*last)->hotkey = menu_hotkey;
 190   (*last)->classes = menu_classes;
 191   if (menu_users)
 192     (*last)->restricted = 1;
 193   (*last)->users = menu_users;
 194   (*last)->argc = argc;
 195   (*last)->args = menu_args;
 196   (*last)->sourcecode = menu_sourcecode;
 197   (*last)->submenu = submenu;
 198   (*last)->bls = bls;
 199
 200   menu->size++;
 201   if (index)
 202     *index = ind;
 203   return GRUB_ERR_NONE;
 204
 205  fail:
 206
 207   grub_free (menu_sourcecode);
 208   {
 209     int i;
 210     for (i = 0; menu_classes && menu_classes[i].name; i++)
 211       grub_free (menu_classes[i].name);
 212     grub_free (menu_classes);
 213   }
 214
 215   {
 216     int i;
 217     for (i = 0; menu_args && menu_args[i]; i++)
 218       grub_free (menu_args[i]);
 219     grub_free (menu_args);
 220   }
 221
 222   grub_free (menu_users);
 223   grub_free (menu_title);
 224   grub_free (menu_id);
 225   return grub_errno;
 226 }
 227
 228 static char *
 229 setparams_prefix (int argc, char **args)
 230 {
 231   int i;
 232   int j;
 233   char *p;
 234   char *result;
 235   grub_size_t len = 10;
 236
 237   /* Count resulting string length */
 238   for (i = 0; i < argc; i++)
 239     {
 240       len += 3; /* 3 = 1 space + 2 quotes */
 241       p = args[i];
 242       while (*p)
 243         len += (*p++ == '\'' ? 3 : 1);
 244     }
 245
 246   result = grub_malloc (len + 2);
 247   if (! result)
 248     return 0;
 249
 250   grub_strcpy (result, "setparams");
 251   p = result + 9;
 252
 253   for (j = 0; j < argc; j++)
 254     {
 255       *p++ = ' ';
 256       *p++ = '\'';
 257       p = grub_strchrsub (p, args[j], '\'', "'\\''");
 258       *p++ = '\'';
 259     }
 260   *p++ = '\n';
 261   *p = '\0';
 262   return result;
 263 }
 264
 265 static grub_err_t
 266 grub_cmd_menuentry (grub_extcmd_context_t ctxt, int argc, char **args)
 267 {
 268   char ch;
 269   char *src;
 270   char *prefix;
 271   unsigned len;
 272   grub_err_t r;
 273   const char *users;
 274
 275   if (! argc)
 276     return grub_error (GRUB_ERR_BAD_ARGUMENT, "missing arguments");
 277
 278   if (ctxt->state[3].set && ctxt->script)
 279     return grub_error (GRUB_ERR_BAD_ARGUMENT, "multiple menuentry definitions");
 280
 281   if (! ctxt->state[3].set && ! ctxt->script)
 282     return grub_error (GRUB_ERR_BAD_ARGUMENT, "no menuentry definition");
 283
 284   if (ctxt->state[1].set)
 285     users = ctxt->state[1].arg;
 286   else if (ctxt->state[5].set)
 287     users = NULL;
 288   else
 289     users = "";
 290
 291   if (! ctxt->script)
 292     return grub_normal_add_menu_entry (argc, (const char **) args,
 293                                        (ctxt->state[0].set ? ctxt->state[0].args
 294                                         : NULL),
 295                                        ctxt->state[4].arg,
 296                                        users,
 297                                        ctxt->state[2].arg, 0,
 298                                        ctxt->state[3].arg,
 299                                        ctxt->extcmd->cmd->name[0] == 's',
 300                                        NULL, NULL);
 301
 302   src = args[argc - 1];
 303   args[argc - 1] = NULL;
 304
 305   len = grub_strlen(src);
 306   ch = src[len - 1];
 307   src[len - 1] = '\0';
 308
 309   prefix = setparams_prefix (argc - 1, args);
 310   if (! prefix)
 311     return grub_errno;
 312
 313   r = grub_normal_add_menu_entry (argc - 1, (const char **) args,
 314                                   ctxt->state[0].args, ctxt->state[4].arg,
 315                                   users,
 316                                   ctxt->state[2].arg, prefix, src + 1,
 317                                   ctxt->extcmd->cmd->name[0] == 's', NULL,
 318                                   NULL);
 319
 320   src[len - 1] = ch;
 321   args[argc - 1] = src;
 322   grub_free (prefix);
 323   return r;
 324 }
 325
 326 static grub_extcmd_t cmd, cmd_sub;
 327
 328 void
 329 grub_menu_init (void)
 330 {
 331   cmd = grub_register_extcmd ("menuentry", grub_cmd_menuentry,
 332                               GRUB_COMMAND_FLAG_BLOCKS
 333                               | GRUB_COMMAND_ACCEPT_DASH
 334                               | GRUB_COMMAND_FLAG_EXTRACTOR,
 335                               N_("BLOCK"), N_("Define a menu entry."), options);
 336   cmd_sub = grub_register_extcmd ("submenu", grub_cmd_menuentry,
 337                                   GRUB_COMMAND_FLAG_BLOCKS
 338                                   | GRUB_COMMAND_ACCEPT_DASH
 339                                   | GRUB_COMMAND_FLAG_EXTRACTOR,
 340                                   N_("BLOCK"), N_("Define a submenu."),
 341                                   options);
 342 }
 343
 344 void
 345 grub_menu_fini (void)
 346 {
 347   grub_unregister_extcmd (cmd);
 348   grub_unregister_extcmd (cmd_sub);
 349 }