grub-core/commands/syslinuxcfg.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2013  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/types.h>
  20 #include <grub/misc.h>
  21 #include <grub/extcmd.h>
  22 #include <grub/mm.h>
  23 #include <grub/err.h>
  24 #include <grub/dl.h>
  25 #include <grub/file.h>
  26 #include <grub/normal.h>
  27 #include <grub/script_sh.h>
  28 #include <grub/i18n.h>
  29 #include <grub/term.h>
  30 #include <grub/syslinux_parse.h>
  31 #include <grub/crypto.h>
  32 #include <grub/auth.h>
  33 #include <grub/disk.h>
  34 #include <grub/partition.h>
  35
  36 GRUB_MOD_LICENSE ("GPLv3+");
  37
  38 /* Helper for syslinux_file.  */
  39 static grub_err_t
  40 syslinux_file_getline (char **line, int cont __attribute__ ((unused)),
  41                      void *data __attribute__ ((unused)))
  42 {
  43   *line = 0;
  44   return GRUB_ERR_NONE;
  45 }
  46
  47 static const struct grub_arg_option options[] =
  48   {
  49     {"root",  'r', 0,
  50      N_("root directory of the syslinux disk [default=/]."),
  51      N_("DIR"), ARG_TYPE_STRING},
  52     {"cwd",  'c', 0,
  53      N_("current directory of syslinux [default is parent directory of input file]."),
  54      N_("DIR"), ARG_TYPE_STRING},
  55     {"isolinux",     'i',  0, N_("assume input is an isolinux configuration file."), 0, 0},
  56     {"pxelinux",     'p',  0, N_("assume input is a pxelinux configuration file."), 0, 0},
  57     {"syslinux",     's',  0, N_("assume input is a syslinux configuration file."), 0, 0},
  58     {0, 0, 0, 0, 0, 0}
  59   };
  60
  61 enum
  62   {
  63     OPTION_ROOT,
  64     OPTION_CWD,
  65     OPTION_ISOLINUX,
  66     OPTION_PXELINUX,
  67     OPTION_SYSLINUX
  68   };
  69
  70 static grub_err_t
  71 syslinux_file (grub_extcmd_context_t ctxt, const char *filename)
  72 {
  73   char *result;
  74   const char *root = ctxt->state[OPTION_ROOT].set ? ctxt->state[OPTION_ROOT].arg : "/";
  75   const char *cwd = ctxt->state[OPTION_CWD].set ? ctxt->state[OPTION_CWD].arg : NULL;
  76   grub_syslinux_flavour_t flav = GRUB_SYSLINUX_UNKNOWN;
  77   char *cwdf = NULL;
  78   grub_menu_t menu;
  79
  80   if (ctxt->state[OPTION_ISOLINUX].set)
  81     flav = GRUB_SYSLINUX_ISOLINUX;
  82   if (ctxt->state[OPTION_PXELINUX].set)
  83     flav = GRUB_SYSLINUX_PXELINUX;
  84   if (ctxt->state[OPTION_SYSLINUX].set)
  85     flav = GRUB_SYSLINUX_SYSLINUX;
  86
  87   if (!cwd)
  88     {
  89       char *p;
  90       cwdf = grub_strdup (filename);
  91       if (!cwdf)
  92         return grub_errno;
  93       p = grub_strrchr (cwdf, '/');
  94       if (!p)
  95         {
  96           grub_free (cwdf);
  97           cwd = "/";
  98           cwdf = NULL;
  99         }
 100       else
 101         {
 102           *p = '\0';
 103           cwd = cwdf;
 104         }
 105     }
 106
 107   grub_dprintf ("syslinux",
 108                 "transforming syslinux config %s, root = %s, cwd = %s\n",
 109                 filename, root, cwd);
 110
 111   result = grub_syslinux_config_file (root, root, cwd, cwd, filename, flav);
 112   if (!result)
 113     return grub_errno;
 114
 115   grub_dprintf ("syslinux", "syslinux config transformed\n");
 116
 117   menu = grub_env_get_menu ();
 118   if (! menu)
 119     {
 120       menu = grub_zalloc (sizeof (*menu));
 121       if (! menu)
 122         {
 123           grub_free (result);
 124           return grub_errno;
 125         }
 126
 127       grub_env_set_menu (menu);
 128     }
 129
 130   grub_normal_parse_line (result, syslinux_file_getline, NULL);
 131   grub_print_error ();
 132   grub_free (result);
 133   grub_free (cwdf);
 134
 135   return GRUB_ERR_NONE;
 136 }
 137
 138 static grub_err_t
 139 grub_cmd_syslinux_source (grub_extcmd_context_t ctxt,
 140                           int argc, char **args)
 141 {
 142   int new_env, extractor;
 143   grub_err_t ret;
 144
 145   if (argc != 1)
 146     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
 147
 148   extractor = (ctxt->extcmd->cmd->name[0] == 'e');
 149   new_env = (ctxt->extcmd->cmd->name[extractor ? (sizeof ("extract_syslinux_entries_") - 1)
 150                              : (sizeof ("syslinux_") - 1)] == 'c');
 151
 152   if (new_env)
 153     grub_cls ();
 154
 155   if (new_env && !extractor)
 156     grub_env_context_open ();
 157   if (extractor)
 158     grub_env_extractor_open (!new_env);
 159
 160   ret = syslinux_file (ctxt, args[0]);
 161
 162   if (new_env)
 163     {
 164       grub_menu_t menu;
 165       menu = grub_env_get_menu ();
 166       if (menu && menu->size)
 167         grub_show_menu (menu, 1, 0);
 168       if (!extractor)
 169         grub_env_context_close ();
 170     }
 171   if (extractor)
 172     grub_env_extractor_close (!new_env);
 173
 174   return ret;
 175 }
 176
 177
 178 static grub_extcmd_t cmd_source, cmd_configfile;
 179 static grub_extcmd_t cmd_source_extract, cmd_configfile_extract;
 180
 181 GRUB_MOD_INIT(syslinuxcfg)
 182 {
 183   cmd_source
 184     = grub_register_extcmd ("syslinux_source",
 185                             grub_cmd_syslinux_source, 0,
 186                             N_("FILE"),
 187                             /* TRANSLATORS: "syslinux config" means
 188                                "config as used by syslinux".  */
 189                             N_("Execute syslinux config in same context"),
 190                             options);
 191   cmd_configfile
 192     = grub_register_extcmd ("syslinux_configfile",
 193                             grub_cmd_syslinux_source, 0,
 194                             N_("FILE"),
 195                             N_("Execute syslinux config in new context"),
 196                             options);
 197   cmd_source_extract
 198     = grub_register_extcmd ("extract_syslinux_entries_source",
 199                             grub_cmd_syslinux_source, 0,
 200                             N_("FILE"),
 201                             N_("Execute syslinux config in same context taking only menu entries"),
 202                             options);
 203   cmd_configfile_extract
 204     = grub_register_extcmd ("extract_syslinux_entries_configfile",
 205                             grub_cmd_syslinux_source, 0,
 206                             N_("FILE"),
 207                             N_("Execute syslinux config in new context taking only menu entries"),
 208                             options);
 209 }
 210
 211 GRUB_MOD_FINI(syslinuxcfg)
 212 {
 213   grub_unregister_extcmd (cmd_source);
 214   grub_unregister_extcmd (cmd_configfile);
 215   grub_unregister_extcmd (cmd_source_extract);
 216   grub_unregister_extcmd (cmd_configfile_extract);
 217 }