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grub/kern/rescue.c

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/* rescue.c - rescue mode */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <grub/kernel.h>
#include <grub/rescue.h>
#include <grub/term.h>
#include <grub/misc.h>
#include <grub/disk.h>
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/err.h>
#include <grub/loader.h>
#include <grub/dl.h>
#include <grub/partition.h>
#include <grub/env.h>
#define GRUB_RESCUE_BUF_SIZE 256
#define GRUB_RESCUE_MAX_ARGS 20
struct grub_rescue_command
{
const char *name;
void (*func) (int argc, char *argv[]);
const char *message;
struct grub_rescue_command *next;
};
typedef struct grub_rescue_command *grub_rescue_command_t;
static char linebuf[GRUB_RESCUE_BUF_SIZE];
static grub_rescue_command_t grub_rescue_command_list;
void
grub_rescue_register_command (const char *name,
void (*func) (int argc, char *argv[]),
const char *message)
{
grub_rescue_command_t cmd;
cmd = (grub_rescue_command_t) grub_malloc (sizeof (*cmd));
if (! cmd)
return;
cmd->name = name;
cmd->func = func;
cmd->message = message;
cmd->next = grub_rescue_command_list;
grub_rescue_command_list = cmd;
}
void
grub_rescue_unregister_command (const char *name)
{
grub_rescue_command_t *p, q;
for (p = &grub_rescue_command_list, q = *p; q; p = &(q->next), q = q->next)
if (grub_strcmp (name, q->name) == 0)
{
*p = q->next;
grub_free (q);
break;
}
}
/* Prompt to input a command and read the line. */
static void
grub_rescue_get_command_line (const char *prompt)
{
int c;
int pos = 0;
grub_printf (prompt);
grub_memset (linebuf, 0, GRUB_RESCUE_BUF_SIZE);
while ((c = GRUB_TERM_ASCII_CHAR (grub_getkey ())) != '\n' && c != '\r')
{
if (grub_isprint (c))
{
if (pos < GRUB_RESCUE_BUF_SIZE - 1)
{
linebuf[pos++] = c;
grub_putchar (c);
}
}
else if (c == '\b')
{
if (pos > 0)
{
linebuf[--pos] = 0;
grub_putchar (c);
grub_putchar (' ');
grub_putchar (c);
}
}
grub_refresh ();
}
grub_putchar ('\n');
grub_refresh ();
}
/* boot */
static void
grub_rescue_cmd_boot (int argc __attribute__ ((unused)),
char *argv[] __attribute__ ((unused)))
{
grub_loader_boot ();
}
/* cat FILE */
static void
grub_rescue_cmd_cat (int argc, char *argv[])
{
grub_file_t file;
char buf[GRUB_DISK_SECTOR_SIZE];
grub_ssize_t size;
if (argc < 1)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified");
return;
}
file = grub_file_open (argv[0]);
if (! file)
return;
while ((size = grub_file_read (file, buf, sizeof (buf))) > 0)
{
int i;
for (i = 0; i < size; i++)
{
unsigned char c = buf[i];
if (grub_isprint (c) || grub_isspace (c))
grub_putchar (c);
else
{
grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
grub_printf ("<%x>", (int) c);
grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
}
}
}
grub_putchar ('\n');
grub_refresh ();
grub_file_close (file);
}
static int
grub_rescue_print_disks (const char *name)
{
grub_device_t dev;
auto int print_partition (grub_disk_t disk, const grub_partition_t p);
int print_partition (grub_disk_t disk __attribute__ ((unused)),
const grub_partition_t p)
{
char *pname = grub_partition_get_name (p);
if (pname)
{
grub_printf ("(%s,%s) ", name, pname);
grub_free (pname);
}
return 0;
}
dev = grub_device_open (name);
grub_errno = GRUB_ERR_NONE;
if (dev)
{
grub_printf ("(%s) ", name);
if (dev->disk && dev->disk->has_partitions)
{
grub_partition_iterate (dev->disk, print_partition);
grub_errno = GRUB_ERR_NONE;
}
grub_device_close (dev);
}
return 0;
}
static int
grub_rescue_print_files (const char *filename, int dir)
{
grub_printf ("%s%s ", filename, dir ? "/" : "");
return 0;
}
/* ls [ARG] */
static void
grub_rescue_cmd_ls (int argc, char *argv[])
{
if (argc < 1)
{
grub_disk_dev_iterate (grub_rescue_print_disks);
grub_putchar ('\n');
grub_refresh ();
}
else
{
char *device_name;
grub_device_t dev;
grub_fs_t fs;
char *path;
device_name = grub_file_get_device_name (argv[0]);
dev = grub_device_open (device_name);
if (! dev)
goto fail;
fs = grub_fs_probe (dev);
path = grub_strchr (argv[0], ')');
if (! path)
path = argv[0];
else
path++;
if (! path && ! device_name)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid argument");
goto fail;
}
if (! path)
{
if (grub_errno == GRUB_ERR_UNKNOWN_FS)
grub_errno = GRUB_ERR_NONE;
grub_printf ("(%s): Filesystem is %s.\n",
device_name, fs ? fs->name : "unknown");
}
else if (fs)
{
(fs->dir) (dev, path, grub_rescue_print_files);
grub_putchar ('\n');
grub_refresh ();
}
fail:
if (dev)
grub_device_close (dev);
grub_free (device_name);
}
}
/* help */
static void
grub_rescue_cmd_help (int argc __attribute__ ((unused)),
char *argv[] __attribute__ ((unused)))
{
grub_rescue_command_t p, q;
/* Sort the commands. This is not a good algorithm, but this is enough,
because rescue mode has a small number of commands. */
for (p = grub_rescue_command_list; p; p = p->next)
for (q = p->next; q; q = q->next)
if (grub_strcmp (p->name, q->name) > 0)
{
struct grub_rescue_command tmp;
tmp.name = p->name;
tmp.func = p->func;
tmp.message = p->message;
p->name = q->name;
p->func = q->func;
p->message = q->message;
q->name = tmp.name;
q->func = tmp.func;
q->message = tmp.message;
}
/* Print them. */
for (p = grub_rescue_command_list; p; p = p->next)
grub_printf ("%s\t%s\n", p->name, p->message);
}
#if 0
static void
grub_rescue_cmd_info (void)
{
extern void grub_disk_cache_get_performance (unsigned long *,
unsigned long *);
unsigned long hits, misses;
grub_disk_cache_get_performance (&hits, &misses);
grub_printf ("Disk cache: hits = %u, misses = %u ", hits, misses);
if (hits + misses)
{
unsigned long ratio = hits * 10000 / (hits + misses);
grub_printf ("(%u.%u%%)\n", ratio / 100, ratio % 100);
}
else
grub_printf ("(N/A)\n");
}
#endif
/* root [DEVICE] */
static void
grub_rescue_cmd_root (int argc, char *argv[])
{
grub_device_t dev;
grub_fs_t fs;
if (argc > 0)
{
char *device_name = grub_file_get_device_name (argv[0]);
if (! device_name)
return;
grub_env_set ("root", device_name);
grub_free (device_name);
}
dev = grub_device_open (0);
if (! dev)
return;
fs = grub_fs_probe (dev);
if (grub_errno == GRUB_ERR_UNKNOWN_FS)
grub_errno = GRUB_ERR_NONE;
grub_printf ("(%s): Filesystem is %s.\n",
grub_env_get ("root"), fs ? fs->name : "unknown");
grub_device_close (dev);
}
#if 0
static void
grub_rescue_cmd_testload (int argc, char *argv[])
{
grub_file_t file;
char *buf;
grub_ssize_t size;
grub_ssize_t pos;
auto void read_func (unsigned long sector, unsigned offset, unsigned len);
void read_func (unsigned long sector __attribute__ ((unused)),
unsigned offset __attribute__ ((unused)),
unsigned len __attribute__ ((unused)))
{
grub_putchar ('.');
grub_refresh ();
}
if (argc < 1)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified");
return;
}
file = grub_file_open (argv[0]);
if (! file)
return;
size = grub_file_size (file) & ~(GRUB_DISK_SECTOR_SIZE - 1);
if (size == 0)
{
grub_file_close (file);
return;
}
buf = grub_malloc (size);
if (! buf)
goto fail;
grub_printf ("Reading %s sequentially", argv[0]);
file->read_hook = read_func;
if (grub_file_read (file, buf, size) != size)
goto fail;
grub_printf (" Done.\n");
/* Read sequentially again. */
grub_printf ("Reading %s sequentially again", argv[0]);
if (grub_file_seek (file, 0) < 0)
goto fail;
for (pos = 0; pos < size; pos += GRUB_DISK_SECTOR_SIZE)
{
char sector[GRUB_DISK_SECTOR_SIZE];
if (grub_file_read (file, sector, GRUB_DISK_SECTOR_SIZE)
!= GRUB_DISK_SECTOR_SIZE)
goto fail;
if (grub_memcmp (sector, buf + pos, GRUB_DISK_SECTOR_SIZE) != 0)
{
grub_printf ("\nDiffers in %d\n", pos);
goto fail;
}
}
grub_printf (" Done.\n");
/* Read backwards and compare. */
grub_printf ("Reading %s backwards", argv[0]);
pos = size;
while (pos > 0)
{
char sector[GRUB_DISK_SECTOR_SIZE];
pos -= GRUB_DISK_SECTOR_SIZE;
if (grub_file_seek (file, pos) < 0)
goto fail;
if (grub_file_read (file, sector, GRUB_DISK_SECTOR_SIZE)
!= GRUB_DISK_SECTOR_SIZE)
goto fail;
if (grub_memcmp (sector, buf + pos, GRUB_DISK_SECTOR_SIZE) != 0)
{
int i;
grub_printf ("\nDiffers in %d\n", pos);
for (i = 0; i < GRUB_DISK_SECTOR_SIZE; i++)
grub_putchar (buf[pos + i]);
if (i)
grub_refresh ();
goto fail;
}
}
grub_printf (" Done.\n");
fail:
grub_file_close (file);
grub_free (buf);
}
#endif
/* dump ADDRESS [SIZE] */
static void
grub_rescue_cmd_dump (int argc, char *argv[])
{
grub_uint8_t *addr;
grub_size_t size = 4;
if (argc == 0)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "no address specified");
return;
}
addr = (grub_uint8_t *) grub_strtoul (argv[0], 0, 0);
if (grub_errno)
return;
if (argc > 1)
size = (grub_size_t) grub_strtoul (argv[1], 0, 0);
while (size--)
{
grub_printf ("%x%x ", *addr >> 4, *addr & 0xf);
addr++;
}
}
/* insmod MODULE */
static void
grub_rescue_cmd_insmod (int argc, char *argv[])
{
char *p;
grub_dl_t mod;
if (argc == 0)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified");
return;
}
p = grub_strchr (argv[0], '/');
if (! p)
mod = grub_dl_load (argv[0]);
else
mod = grub_dl_load_file (argv[0]);
if (mod)
grub_dl_ref (mod);
}
/* rmmod MODULE */
static void
grub_rescue_cmd_rmmod (int argc, char *argv[])
{
grub_dl_t mod;
if (argc == 0)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified");
return;
}
mod = grub_dl_get (argv[0]);
if (! mod)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "no such module");
return;
}
if (grub_dl_unref (mod) <= 0)
grub_dl_unload (mod);
}
/* lsmod */
static void
grub_rescue_cmd_lsmod (int argc __attribute__ ((unused)),
char *argv[] __attribute__ ((unused)))
{
auto int print_module (grub_dl_t mod);
int print_module (grub_dl_t mod)
{
grub_dl_dep_t dep;
grub_printf ("%s\t%d\t\t", mod->name, mod->ref_count);
for (dep = mod->dep; dep; dep = dep->next)
{
if (dep != mod->dep)
grub_putchar (',');
grub_printf ("%s", dep->mod->name);
}
grub_putchar ('\n');
grub_refresh ();
return 0;
}
grub_printf ("Name\tRef Count\tDependencies\n");
grub_dl_iterate (print_module);
}
/* set ENVVAR=VALUE */
static void
grub_rescue_cmd_set (int argc, char *argv[])
{
char *var;
char *val;
auto int print_env (struct grub_env_var *env);
int print_env (struct grub_env_var *env)
{
grub_printf ("%s=%s\n", env->name, env->value);
return 0;
}
if (argc < 1)
{
grub_env_iterate (print_env);
return;
}
var = argv[0];
val = grub_strchr (var, '=');
if (! val)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "not an assignment");
return;
}
val[0] = 0;
grub_env_set (var, val + 1);
val[0] = '=';
}
static void
grub_rescue_cmd_unset (int argc, char *argv[])
{
if (argc < 1)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "no environment variable specified");
return;
}
grub_env_unset (argv[0]);
}
static void
attempt_normal_mode (void)
{
grub_rescue_command_t cmd;
for (cmd = grub_rescue_command_list; cmd; cmd = cmd->next)
{
if (grub_strcmp ("normal", cmd->name) == 0)
{
(cmd->func) (0, 0);
break;
}
}
}
/* Enter the rescue mode. */
void
grub_enter_rescue_mode (void)
{
auto grub_err_t getline (char **line);
grub_err_t getline (char **line)
{
grub_rescue_get_command_line ("> ");
*line = linebuf;
return 0;
}
/* First of all, attempt to execute the normal mode. */
attempt_normal_mode ();
grub_printf ("Entering into rescue mode...\n");
grub_rescue_register_command ("boot", grub_rescue_cmd_boot,
"boot an operating system");
grub_rescue_register_command ("cat", grub_rescue_cmd_cat,
"show the contents of a file");
grub_rescue_register_command ("help", grub_rescue_cmd_help,
"show this message");
grub_rescue_register_command ("ls", grub_rescue_cmd_ls,
"list devices or files");
grub_rescue_register_command ("root", grub_rescue_cmd_root,
"set the root device");
grub_rescue_register_command ("dump", grub_rescue_cmd_dump,
"dump memory");
grub_rescue_register_command ("insmod", grub_rescue_cmd_insmod,
"insert a module");
grub_rescue_register_command ("rmmod", grub_rescue_cmd_rmmod,
"remove a module");
grub_rescue_register_command ("lsmod", grub_rescue_cmd_lsmod,
"show loaded modules");
grub_rescue_register_command ("set", grub_rescue_cmd_set,
"set an environment variable");
grub_rescue_register_command ("unset", grub_rescue_cmd_unset,
"remove an environment variable");
while (1)
{
char *line = linebuf;
char *name;
int n;
grub_rescue_command_t cmd;
char **args;
/* Print an error, if any. */
grub_print_error ();
grub_errno = GRUB_ERR_NONE;
/* Get a command line. */
grub_rescue_get_command_line ("grub rescue> ");
if (grub_split_cmdline (line, getline, &n, &args) || n < 0)
continue;
/* In case of an assignment set the environment accordingly
instead of calling a function. */
if (n == 0 && grub_strchr (line, '='))
{
char *val = grub_strchr (args[0], '=');
val[0] = 0;
grub_env_set (args[0], val + 1);
val[0] = '=';
continue;
}
/* Get the command name. */
name = args[0];
/* If nothing is specified, restart. */
if (*name == '\0')
continue;
/* Find the command and execute it. */
for (cmd = grub_rescue_command_list; cmd; cmd = cmd->next)
{
if (grub_strcmp (name, cmd->name) == 0)
{
(cmd->func) (n, &args[1]);
break;
}
}
/* If not found, print an error message. */
if (! cmd)
{
grub_printf ("Unknown command `%s'\n", name);
grub_printf ("Try `help' for usage\n");
}
}
}
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