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/* extcmd.c - support extended command */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/mm.h>
#include <grub/list.h>
#include <grub/lockdown.h>
#include <grub/misc.h>
#include <grub/extcmd.h>
#include <grub/script_sh.h>
#include <grub/dl.h>
GRUB_MOD_LICENSE ("GPLv3+");
grub_err_t
grub_extcmd_dispatcher (struct grub_command *cmd, int argc, char **args,
struct grub_script *script)
{
int new_argc;
char **new_args;
struct grub_arg_list *state;
struct grub_extcmd_context context;
grub_err_t ret;
grub_extcmd_t ext = cmd->data;
context.state = 0;
context.extcmd = ext;
context.script = script;
if (! ext->options)
{
ret = (ext->func) (&context, argc, args);
return ret;
}
state = grub_arg_list_alloc (ext, argc, args);
if (grub_arg_parse (ext, argc, args, state, &new_args, &new_argc))
{
context.state = state;
ret = (ext->func) (&context, new_argc, new_args);
grub_free (new_args);
grub_free (state);
return ret;
}
grub_free (state);
return grub_errno;
}
static grub_err_t
grub_extcmd_dispatch (struct grub_command *cmd, int argc, char **args)
{
return grub_extcmd_dispatcher (cmd, argc, args, 0);
}
grub_extcmd_t
grub_register_extcmd_prio (const char *name, grub_extcmd_func_t func,
grub_command_flags_t flags, const char *summary,
const char *description,
const struct grub_arg_option *parser,
int prio)
{
grub_extcmd_t ext;
grub_command_t cmd;
ext = (grub_extcmd_t) grub_malloc (sizeof (*ext));
if (! ext)
return 0;
cmd = grub_register_command_prio (name, grub_extcmd_dispatch,
summary, description, prio);
if (! cmd)
{
grub_free (ext);
return 0;
}
cmd->flags = (flags | GRUB_COMMAND_FLAG_EXTCMD);
cmd->data = ext;
ext->cmd = cmd;
ext->func = func;
ext->options = parser;
ext->data = 0;
return ext;
}
grub_extcmd_t
grub_register_extcmd (const char *name, grub_extcmd_func_t func,
grub_command_flags_t flags, const char *summary,
const char *description,
const struct grub_arg_option *parser)
{
return grub_register_extcmd_prio (name, func, flags,
summary, description, parser, 1);
}
static grub_err_t
grub_extcmd_lockdown (grub_extcmd_context_t ctxt __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char **argv __attribute__ ((unused)))
{
return grub_error (GRUB_ERR_ACCESS_DENIED,
N_("%s: the command is not allowed when lockdown is enforced"),
ctxt->extcmd->cmd->name);
}
grub_extcmd_t
grub_register_extcmd_lockdown (const char *name, grub_extcmd_func_t func,
grub_command_flags_t flags, const char *summary,
const char *description,
const struct grub_arg_option *parser)
{
if (grub_is_lockdown () == GRUB_LOCKDOWN_ENABLED)
func = grub_extcmd_lockdown;
return grub_register_extcmd (name, func, flags, summary, description, parser);
}
void
grub_unregister_extcmd (grub_extcmd_t ext)
{
grub_unregister_command (ext->cmd);
grub_free (ext);
}
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