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grub2/grub-core/lib/syslinux_parse.c
Darren Kenny 95bc016dba syslinux: Fix memory leak while parsing 
In syslinux_parse_real() the 2 points where return is being called
didn't release the memory stored in buf which is no longer required.

Fixes: CID 176634

Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2021-03-02 15:54:17 +01:00

1556 lines
38 KiB
C
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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013 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/file.h>
#include <grub/normal.h>
#include <grub/syslinux_parse.h>
struct syslinux_say
{
struct syslinux_say *next;
struct syslinux_say *prev;
char msg[0];
};
struct initrd_list
{
struct initrd_list *next;
char *file;
};
struct syslinux_menuentry
{
struct syslinux_menuentry *next;
struct syslinux_menuentry *prev;
char *label;
char *extlabel;
char *kernel_file;
struct initrd_list *initrds;
struct initrd_list *initrds_last;
char *append;
char *argument;
char *help;
char *comments;
grub_size_t commentslen;
char hotkey;
int make_default;
struct syslinux_say *say;
enum { KERNEL_NO_KERNEL, KERNEL_LINUX, KERNEL_CHAINLOADER,
KERNEL_BIN, KERNEL_PXE, KERNEL_CHAINLOADER_BPB,
KERNEL_COM32, KERNEL_COM, KERNEL_IMG, KERNEL_CONFIG, LOCALBOOT }
entry_type;
};
struct syslinux_menu
{
struct syslinux_menu *parent;
struct syslinux_menuentry *entries;
char *def;
char *comments;
char *background;
const char *root_read_directory;
const char *root_target_directory;
const char *current_read_directory;
const char *current_target_directory;
const char *filename;
grub_size_t commentslen;
unsigned long timeout;
struct syslinux_say *say;
grub_syslinux_flavour_t flavour;
};
struct output_buffer
{
grub_size_t alloc;
grub_size_t ptr;
char *buf;
};
static grub_err_t
syslinux_parse_real (struct syslinux_menu *menu);
static grub_err_t
config_file (struct output_buffer *outbuf,
const char *root, const char *target_root,
const char *cwd, const char *target_cwd,
const char *fname, struct syslinux_menu *parent,
grub_syslinux_flavour_t flav);
static grub_err_t
print_entry (struct output_buffer *outbuf,
struct syslinux_menu *menu,
const char *str);
static grub_err_t
ensure_space (struct output_buffer *outbuf, grub_size_t len)
{
grub_size_t newlen;
char *newbuf;
if (len < outbuf->alloc - outbuf->ptr)
return GRUB_ERR_NONE;
newlen = (outbuf->ptr + len + 10) * 2;
newbuf = grub_realloc (outbuf->buf, newlen);
if (!newbuf)
return grub_errno;
outbuf->alloc = newlen;
outbuf->buf = newbuf;
return GRUB_ERR_NONE;
}
static grub_err_t
print (struct output_buffer *outbuf, const char *str, grub_size_t len)
{
grub_err_t err;
err = ensure_space (outbuf, len);
if (err)
return err;
grub_memcpy (&outbuf->buf[outbuf->ptr], str, len);
outbuf->ptr += len;
return GRUB_ERR_NONE;
}
static grub_err_t
add_comment (struct syslinux_menu *menu, const char *comment, int nl)
{
if (menu->entries)
{
if (menu->entries->commentslen == 0 && *comment == 0)
return GRUB_ERR_NONE;
menu->entries->comments = grub_realloc (menu->entries->comments,
menu->entries->commentslen
+ 2 + grub_strlen (comment));
if (!menu->entries->comments)
return grub_errno;
menu->entries->commentslen
+= grub_stpcpy (menu->entries->comments + menu->entries->commentslen,
comment)
- (menu->entries->comments + menu->entries->commentslen);
if (nl)
menu->entries->comments[menu->entries->commentslen++] = '\n';
menu->entries->comments[menu->entries->commentslen] = '\0';
}
else
{
if (menu->commentslen == 0 && *comment == 0)
return GRUB_ERR_NONE;
menu->comments = grub_realloc (menu->comments, menu->commentslen
+ 2 + grub_strlen (comment));
if (!menu->comments)
return grub_errno;
menu->commentslen += grub_stpcpy (menu->comments + menu->commentslen,
comment)
- (menu->comments + menu->commentslen);
if (nl)
menu->comments[menu->commentslen++] = '\n';
menu->comments[menu->commentslen] = '\0';
}
return GRUB_ERR_NONE;
}
#define print_string(x) do { err = print (outbuf, x, sizeof (x) - 1); if (err) return err; } while (0)
static grub_err_t
print_num (struct output_buffer *outbuf, int n)
{
char buf[20];
grub_snprintf (buf, sizeof (buf), "%d", n);
return print (outbuf, buf, grub_strlen (buf));
}
static grub_err_t
label (const char *line, struct syslinux_menu *menu)
{
struct syslinux_menuentry *entry;
entry = grub_malloc (sizeof (*entry));
if (!entry)
return grub_errno;
grub_memset (entry, 0, sizeof (*entry));
entry->label = grub_strdup (line);
if (!entry->label)
{
grub_free (entry);
return grub_errno;
}
entry->next = menu->entries;
entry->prev = NULL;
if (menu->entries)
menu->entries->prev = entry;
menu->entries = entry;
return GRUB_ERR_NONE;
}
static grub_err_t
kernel (const char *line, struct syslinux_menu *menu)
{
const char *end = line + grub_strlen (line);
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->kernel_file = grub_strdup (line);
if (!menu->entries->kernel_file)
return grub_errno;
menu->entries->entry_type = KERNEL_LINUX;
if (end - line >= 2 && grub_strcmp (end - 2, ".0") == 0)
menu->entries->entry_type = KERNEL_PXE;
if (end - line >= 4 && grub_strcasecmp (end - 4, ".bin") == 0)
menu->entries->entry_type = KERNEL_BIN;
if (end - line >= 3 && grub_strcasecmp (end - 3, ".bs") == 0)
menu->entries->entry_type = KERNEL_CHAINLOADER;
if (end - line >= 4 && grub_strcasecmp (end - 4, ".bss") == 0)
menu->entries->entry_type = KERNEL_CHAINLOADER_BPB;
if (end - line >= 4 && grub_strcasecmp (end - 4, ".c32") == 0)
menu->entries->entry_type = KERNEL_COM32;
if (end - line >= 4 && grub_strcasecmp (end - 4, ".cbt") == 0)
menu->entries->entry_type = KERNEL_COM;
if (end - line >= 4 && grub_strcasecmp (end - 4, ".com") == 0)
menu->entries->entry_type = KERNEL_COM;
if (end - line >= 4 && grub_strcasecmp (end - 4, ".img") == 0)
menu->entries->entry_type = KERNEL_IMG;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_linux (const char *line, struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->kernel_file = grub_strdup (line);
if (!menu->entries->kernel_file)
return grub_errno;
menu->entries->entry_type = KERNEL_LINUX;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_boot (const char *line, struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->kernel_file = grub_strdup (line);
if (!menu->entries->kernel_file)
return grub_errno;
menu->entries->entry_type = KERNEL_CHAINLOADER;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_bss (const char *line, struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->kernel_file = grub_strdup (line);
if (!menu->entries->kernel_file)
return grub_errno;
menu->entries->entry_type = KERNEL_CHAINLOADER_BPB;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_pxe (const char *line, struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->kernel_file = grub_strdup (line);
if (!menu->entries->kernel_file)
return grub_errno;
menu->entries->entry_type = KERNEL_PXE;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_fdimage (const char *line, struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->kernel_file = grub_strdup (line);
if (!menu->entries->kernel_file)
return grub_errno;
menu->entries->entry_type = KERNEL_IMG;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_comboot (const char *line, struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->kernel_file = grub_strdup (line);
if (!menu->entries->kernel_file)
return grub_errno;
menu->entries->entry_type = KERNEL_COM;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_com32 (const char *line, struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->kernel_file = grub_strdup (line);
if (!menu->entries->kernel_file)
return grub_errno;
menu->entries->entry_type = KERNEL_COM32;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_config (const char *line, struct syslinux_menu *menu)
{
const char *space;
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
for (space = line; *space && !grub_isspace (*space); space++);
menu->entries->kernel_file = grub_strndup (line, space - line);
if (!menu->entries->kernel_file)
return grub_errno;
for (; *space && grub_isspace (*space); space++);
if (*space)
{
menu->entries->argument = grub_strdup (space);
if (!menu->entries->argument)
return grub_errno;
}
menu->entries->entry_type = KERNEL_CONFIG;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_append (const char *line, struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->append = grub_strdup (line);
if (!menu->entries->append)
return grub_errno;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_initrd (const char *line, struct syslinux_menu *menu)
{
struct initrd_list *ninitrd;
const char *comma;
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
while (*line)
{
for (comma = line; *comma && *comma != ','; comma++);
ninitrd = grub_malloc (sizeof (*ninitrd));
if (!ninitrd)
return grub_errno;
ninitrd->file = grub_strndup (line, comma - line);
if (!ninitrd->file)
{
grub_free (ninitrd);
return grub_errno;
}
ninitrd->next = NULL;
if (menu->entries->initrds_last)
menu->entries->initrds_last->next = ninitrd;
else
{
menu->entries->initrds_last = ninitrd;
menu->entries->initrds = ninitrd;
}
line = comma;
while (*line == ',')
line++;
}
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_default (const char *line, struct syslinux_menu *menu)
{
menu->def = grub_strdup (line);
if (!menu->def)
return grub_errno;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_timeout (const char *line, struct syslinux_menu *menu)
{
menu->timeout = grub_strtoul (line, NULL, 0);
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_menudefault (const char *line __attribute__ ((unused)),
struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->make_default = 1;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_menubackground (const char *line,
struct syslinux_menu *menu)
{
menu->background = grub_strdup (line);
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_localboot (const char *line,
struct syslinux_menu *menu)
{
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->kernel_file = grub_strdup (line);
if (!menu->entries->kernel_file)
return grub_errno;
menu->entries->entry_type = LOCALBOOT;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_extlabel (const char *line, struct syslinux_menu *menu)
{
const char *in;
char *out;
if (!menu->entries)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "kernel without label");
menu->entries->extlabel = grub_malloc (grub_strlen (line) + 1);
if (!menu->entries->extlabel)
return grub_errno;
in = line;
out = menu->entries->extlabel;
while (*in)
{
if (in[0] == '^' && in[1])
{
menu->entries->hotkey = grub_tolower (in[1]);
in++;
}
*out++ = *in++;
}
*out = 0;
return GRUB_ERR_NONE;
}
static grub_err_t
cmd_say (const char *line, struct syslinux_menu *menu)
{
struct syslinux_say *nsay;
nsay = grub_malloc (sizeof (*nsay) + grub_strlen (line) + 1);
if (!nsay)
return grub_errno;
nsay->prev = NULL;
if (menu->entries)
{
nsay->next = menu->entries->say;
menu->entries->say = nsay;
}
else
{
nsay->next = menu->say;
menu->say = nsay;
}
if (nsay->next)
nsay->next->prev = nsay;
grub_memcpy (nsay->msg, line, grub_strlen (line) + 1);
return GRUB_ERR_NONE;
}
static char *
get_read_filename (struct syslinux_menu *menu,
const char *filename)
{
return grub_xasprintf ("%s/%s",
filename[0] == '/' ? menu->root_read_directory
: menu->current_read_directory, filename);
}
static char *
get_target_filename (struct syslinux_menu *menu,
const char *filename)
{
return grub_xasprintf ("%s/%s",
filename[0] == '/' ? menu->root_target_directory
: menu->current_target_directory, filename);
}
static grub_err_t
syslinux_parse (const char *filename,
struct syslinux_menu *menu)
{
const char *old_filename = menu->filename;
grub_err_t ret;
char *nf;
nf = get_read_filename (menu, filename);
if (!nf)
return grub_errno;
menu->filename = nf;
ret = syslinux_parse_real (menu);
if (ret == GRUB_ERR_FILE_NOT_FOUND
|| ret == GRUB_ERR_BAD_FILENAME)
{
grub_errno = ret = GRUB_ERR_NONE;
add_comment (menu, "# File ", 0);
add_comment (menu, nf, 0);
add_comment (menu, " not found", 1);
}
grub_free (nf);
menu->filename = old_filename;
return ret;
}
struct
{
const char *name1;
const char *name2;
grub_err_t (*parse) (const char *line, struct syslinux_menu *menu);
} commands[] = {
/* FIXME: support tagname. */
{"include", NULL, syslinux_parse},
{"menu", "include", syslinux_parse},
{"label", NULL, label},
{"kernel", NULL, kernel},
{"linux", NULL, cmd_linux},
{"boot", NULL, cmd_boot},
{"bss", NULL, cmd_bss},
{"pxe", NULL, cmd_pxe},
{"fdimage", NULL, cmd_fdimage},
{"comboot", NULL, cmd_comboot},
{"com32", NULL, cmd_com32},
{"config", NULL, cmd_config},
{"append", NULL, cmd_append},
/* FIXME: ipappend not supported. */
{"localboot", NULL, cmd_localboot},
{"initrd", NULL, cmd_initrd},
{"default", NULL, cmd_default},
{"menu", "label", cmd_extlabel},
/* FIXME: MENU LABEL not supported. */
/* FIXME: MENU HIDDEN not supported. */
/* FIXME: MENU SEPARATOR not supported. */
/* FIXME: MENU INDENT not supported. */
/* FIXME: MENU DISABLE not supported. */
/* FIXME: MENU HIDE not supported. */
{"menu", "default", cmd_menudefault},
/* FIXME: MENU PASSWD not supported. */
/* FIXME: MENU MASTER PASSWD not supported. */
{"menu", "background", cmd_menubackground},
/* FIXME: MENU BEGIN not supported. */
/* FIXME: MENU GOTO not supported. */
/* FIXME: MENU EXIT not supported. */
/* FIXME: MENU QUIT not supported. */
/* FIXME: MENU START not supported. */
/* FIXME: MENU AUTOBOOT not supported. */
/* FIXME: MENU TABMSG not supported. */
/* FIXME: MENU NOTABMSG not supported. */
/* FIXME: MENU PASSPROMPT not supported. */
/* FIXME: MENU COLOR not supported. */
/* FIXME: MENU MSGCOLOR not supported. */
/* FIXME: MENU WIDTH not supported. */
/* FIXME: MENU MARGIN not supported. */
/* FIXME: MENU PASSWORDMARGIN not supported. */
/* FIXME: MENU ROWS not supported. */
/* FIXME: MENU TABMSGROW not supported. */
/* FIXME: MENU CMDLINEROW not supported. */
/* FIXME: MENU ENDROW not supported. */
/* FIXME: MENU PASSWORDROW not supported. */
/* FIXME: MENU TIMEOUTROW not supported. */
/* FIXME: MENU HELPMSGROW not supported. */
/* FIXME: MENU HELPMSGENDROW not supported. */
/* FIXME: MENU HIDDENROW not supported. */
/* FIXME: MENU HSHIFT not supported. */
/* FIXME: MENU VSHIFT not supported. */
{"timeout", NULL, cmd_timeout},
/* FIXME: TOTALTIMEOUT not supported. */
/* FIXME: ONTIMEOUT not supported. */
/* FIXME: ONERROR not supported. */
/* FIXME: SERIAL not supported. */
/* FIXME: CONSOLE not supported. */
/* FIXME: FONT not supported. */
/* FIXME: KBDMAP not supported. */
{"say", NULL, cmd_say},
/* FIXME: DISPLAY not supported. */
/* FIXME: F* not supported. */
/* Commands to control interface behaviour which aren't needed with GRUB.
If they are important in your environment please contact GRUB team.
*/
{"prompt", NULL, NULL},
{"nocomplete", NULL, NULL},
{"noescape", NULL, NULL},
{"implicit", NULL, NULL},
{"allowoptions", NULL, NULL}
};
static grub_err_t
helptext (const char *line, grub_file_t file, struct syslinux_menu *menu)
{
char *help;
char *buf = NULL;
grub_size_t helplen, alloclen = 0;
help = grub_strdup (line);
if (!help)
return grub_errno;
helplen = grub_strlen (line);
while ((grub_free (buf), buf = grub_file_getline (file)))
{
char *ptr;
grub_size_t needlen;
for (ptr = buf; *ptr && grub_isspace (*ptr); ptr++);
if (grub_strncasecmp (ptr, "endtext", sizeof ("endtext") - 1) == 0)
{
ptr += sizeof ("endtext") - 1;
for (; *ptr && (grub_isspace (*ptr) || *ptr == '\n' || *ptr == '\r');
ptr++);
if (!*ptr)
{
menu->entries->help = help;
grub_free (buf);
return GRUB_ERR_NONE;
}
}
needlen = helplen + 1 + grub_strlen (buf);
if (alloclen < needlen)
{
alloclen = 2 * needlen;
help = grub_realloc (help, alloclen);
if (!help)
{
grub_free (buf);
return grub_errno;
}
}
helplen += grub_stpcpy (help + helplen, buf) - (help + helplen);
}
grub_free (buf);
grub_free (help);
return grub_errno;
}
static grub_err_t
syslinux_parse_real (struct syslinux_menu *menu)
{
grub_file_t file;
char *buf = NULL;
grub_err_t err = GRUB_ERR_NONE;
file = grub_file_open (menu->filename, GRUB_FILE_TYPE_CONFIG);
if (!file)
return grub_errno;
while ((grub_free (buf), buf = grub_file_getline (file)))
{
const char *ptr1, *ptr2, *ptr3, *ptr4, *ptr5;
char *end;
unsigned i;
end = buf + grub_strlen (buf);
while (end > buf && (end[-1] == '\n' || end[-1] == '\r'))
end--;
*end = 0;
for (ptr1 = buf; *ptr1 && grub_isspace (*ptr1); ptr1++);
if (*ptr1 == '#' || *ptr1 == 0)
{
err = add_comment (menu, ptr1, 1);
if (err)
goto fail;
continue;
}
for (ptr2 = ptr1; !grub_isspace (*ptr2) && *ptr2; ptr2++);
for (ptr3 = ptr2; grub_isspace (*ptr3) && *ptr3; ptr3++);
for (ptr4 = ptr3; !grub_isspace (*ptr4) && *ptr4; ptr4++);
for (ptr5 = ptr4; grub_isspace (*ptr5) && *ptr5; ptr5++);
for (i = 0; i < ARRAY_SIZE(commands); i++)
if (grub_strlen (commands[i].name1) == (grub_size_t) (ptr2 - ptr1)
&& grub_strncasecmp (commands[i].name1, ptr1, ptr2 - ptr1) == 0
&& (commands[i].name2 == NULL
|| (grub_strlen (commands[i].name2)
== (grub_size_t) (ptr4 - ptr3)
&& grub_strncasecmp (commands[i].name2, ptr3, ptr4 - ptr3)
== 0)))
break;
if (i == ARRAY_SIZE(commands))
{
if (sizeof ("text") - 1 == ptr2 - ptr1
&& grub_strncasecmp ("text", ptr1, ptr2 - ptr1) == 0
&& (sizeof ("help") - 1 == ptr4 - ptr3
&& grub_strncasecmp ("help", ptr3, ptr4 - ptr3) == 0))
{
if (helptext (ptr5, file, menu))
{
grub_free (buf);
return 1;
}
continue;
}
add_comment (menu, " # UNSUPPORTED command '", 0);
add_comment (menu, ptr1, 0);
add_comment (menu, "'", 1);
continue;
}
if (commands[i].parse)
{
err = commands[i].parse (commands[i].name2
? ptr5 : ptr3, menu);
if (err)
goto fail;
}
}
fail:
grub_file_close (file);
grub_free (buf);
return err;
}
static grub_err_t
print_escaped (struct output_buffer *outbuf,
const char *from, const char *to)
{
const char *ptr;
grub_err_t err;
if (!to)
to = from + grub_strlen (from);
err = ensure_space (outbuf, (to - from) * 4 + 2);
if (err)
return err;
outbuf->buf[outbuf->ptr++] = '\'';
for (ptr = from; *ptr && ptr < to; ptr++)
{
if (*ptr == '\'')
{
outbuf->buf[outbuf->ptr++] = '\'';
outbuf->buf[outbuf->ptr++] = '\\';
outbuf->buf[outbuf->ptr++] = '\'';
outbuf->buf[outbuf->ptr++] = '\'';
}
else
outbuf->buf[outbuf->ptr++] = *ptr;
}
outbuf->buf[outbuf->ptr++] = '\'';
return GRUB_ERR_NONE;
}
static grub_err_t
print_file (struct output_buffer *outbuf,
struct syslinux_menu *menu, const char *from, const char *to)
{
grub_err_t err;
if (!to)
to = from + grub_strlen (from);
err = print_escaped (outbuf, from[0] == '/'
? menu->root_target_directory
: menu->current_target_directory, NULL);
if (err)
return err;
err = print (outbuf, "/", 1);
if (err)
return err;
return print_escaped (outbuf, from, to);
}
/*
* Makefile.am mimics this when generating tests/syslinux/ubuntu10.04_grub.cfg,
* so changes here may need to be reflected there too.
*/
static void
simplify_filename (char *str)
{
char *iptr, *optr = str;
for (iptr = str; *iptr; iptr++)
{
if (*iptr == '/' && optr != str && optr[-1] == '/')
continue;
if (iptr[0] == '/' && iptr[1] == '.' && iptr[2] == '/')
{
iptr += 2;
continue;
}
if (iptr[0] == '/' && iptr[1] == '.' && iptr[2] == '.'
&& iptr[3] == '/')
{
iptr += 3;
while (optr >= str && *optr != '/')
optr--;
if (optr < str)
{
str[0] = '/';
optr = str;
}
optr++;
continue;
}
*optr++ = *iptr;
}
*optr = '\0';
}
static grub_err_t
print_config (struct output_buffer *outbuf,
struct syslinux_menu *menu,
const char *filename, const char *basedir)
{
struct syslinux_menu *menuptr;
grub_err_t err = GRUB_ERR_NONE;
char *new_cwd = NULL;
char *new_target_cwd = NULL;
char *newname = NULL;
int depth = 0;
new_cwd = get_read_filename (menu, basedir);
if (!new_cwd)
{
err = grub_errno;
goto out;
}
new_target_cwd = get_target_filename (menu, basedir);
if (!new_target_cwd)
{
err = grub_errno;
goto out;
}
newname = get_read_filename (menu, filename);
if (!newname)
{
err = grub_errno;
goto out;
}
simplify_filename (newname);
print_string ("#");
print_file (outbuf, menu, filename, NULL);
print_string (" ");
err = print (outbuf, newname, grub_strlen (newname));
if (err)
return err;
print_string (":\n");
for (menuptr = menu; menuptr; menuptr = menuptr->parent, depth++)
if (grub_strcmp (menuptr->filename, newname) == 0
|| depth > 20)
break;
if (menuptr)
{
print_string (" syslinux_configfile -r ");
print_file (outbuf, menu, "/", NULL);
print_string (" -c ");
print_file (outbuf, menu, basedir, NULL);
print_string (" ");
print_file (outbuf, menu, filename, NULL);
print_string ("\n");
}
else
{
err = config_file (outbuf, menu->root_read_directory,
menu->root_target_directory, new_cwd, new_target_cwd,
newname, menu, menu->flavour);
if (err == GRUB_ERR_FILE_NOT_FOUND
|| err == GRUB_ERR_BAD_FILENAME)
{
grub_errno = err = GRUB_ERR_NONE;
print_string ("# File ");
err = print (outbuf, newname, grub_strlen (newname));
if (err)
goto out;
print_string (" not found\n");
}
}
out:
grub_free (newname);
grub_free (new_cwd);
grub_free (new_target_cwd);
return err;
}
static grub_err_t
write_entry (struct output_buffer *outbuf,
struct syslinux_menu *menu,
struct syslinux_menuentry *curentry)
{
grub_err_t err;
if (curentry->comments)
{
err = print (outbuf, curentry->comments,
grub_strlen (curentry->comments));
if (err)
return err;
}
{
struct syslinux_say *say;
for (say = curentry->say; say && say->next; say = say->next);
for (; say && say->prev; say = say->prev)
{
print_string ("echo ");
if (print_escaped (outbuf, say->msg, NULL)) return grub_errno;
print_string ("\n");
}
}
/* FIXME: support help text. */
switch (curentry->entry_type)
{
case KERNEL_LINUX:
{
const char *ptr;
const char *initrd = NULL, *initrde= NULL;
for (ptr = curentry->append; ptr && *ptr; ptr++)
if ((ptr == curentry->append || grub_isspace (ptr[-1]))
&& grub_strncasecmp (ptr, "initrd=", sizeof ("initrd=") - 1)
== 0)
break;
if (ptr && *ptr)
{
initrd = ptr + sizeof ("initrd=") - 1;
for (initrde = initrd; *initrde && !grub_isspace (*initrde); initrde++);
}
print_string (" if test x$grub_platform = xpc; then "
"linux_suffix=16; else linux_suffix= ; fi\n");
print_string (" linux$linux_suffix ");
print_file (outbuf, menu, curentry->kernel_file, NULL);
print_string (" ");
if (curentry->append)
{
err = print (outbuf, curentry->append, grub_strlen (curentry->append));
if (err)
return err;
}
print_string ("\n");
if (initrd || curentry->initrds)
{
struct initrd_list *lst;
print_string (" initrd$linux_suffix ");
if (initrd)
{
print_file (outbuf, menu, initrd, initrde);
print_string (" ");
}
for (lst = curentry->initrds; lst; lst = lst->next)
{
print_file (outbuf, menu, lst->file, NULL);
print_string (" ");
}
print_string ("\n");
}
}
break;
case KERNEL_CHAINLOADER:
print_string (" chainloader ");
print_file (outbuf, menu, curentry->kernel_file, NULL);
print_string ("\n");
break;
case KERNEL_CHAINLOADER_BPB:
print_string (" chainloader --bpb ");
print_file (outbuf, menu, curentry->kernel_file, NULL);
print_string ("\n");
break;
case LOCALBOOT:
/* FIXME: support -1. */
/* FIXME: PXELINUX. */
{
int n = grub_strtol (curentry->kernel_file, NULL, 0);
if (n >= 0 && n <= 0x02)
{
print_string (" root=fd");
if (print_num (outbuf, n))
return grub_errno;
print_string (";\n chainloader +1;\n");
break;
}
if (n >= 0x80 && n < 0x8a)
{
print_string (" root=hd");
if (print_num (outbuf, n - 0x80))
return grub_errno;
print_string (";\n chainloader +1;\n");
break;
}
print_string (" # UNSUPPORTED localboot type ");
print_string ("\ntrue;\n");
if (print_num (outbuf, n))
return grub_errno;
print_string ("\n");
break;
}
case KERNEL_COM32:
case KERNEL_COM:
{
char *basename = NULL;
{
char *ptr;
for (ptr = curentry->kernel_file; *ptr; ptr++)
if (*ptr == '/' || *ptr == '\\')
basename = ptr;
}
if (!basename)
basename = curentry->kernel_file;
else
basename++;
if (grub_strcasecmp (basename, "chain.c32") == 0)
{
char *file = NULL;
int is_fd = -1, devn = 0;
int part = -1;
int swap = 0;
char *ptr;
for (ptr = curentry->append; *ptr; )
{
while (grub_isspace (*ptr))
ptr++;
/* FIXME: support mbr: and boot. */
if (ptr[0] == 'h' && ptr[1] == 'd')
{
is_fd = 0;
devn = grub_strtoul (ptr + 2, (const char **)&ptr, 0);
continue;
}
if (grub_strncasecmp (ptr, "file=", 5) == 0)
{
file = ptr + 5;
for (ptr = file; *ptr && !grub_isspace (*ptr); ptr++);
if (*ptr)
{
*ptr = 0;
ptr++;
}
continue;
}
if (grub_strncasecmp (ptr, "swap", sizeof ("swap") - 1) == 0)
{
swap = 1;
ptr += sizeof ("swap") - 1;
continue;
}
if (ptr[0] == 'f' && ptr[1] == 'd')
{
is_fd = 1;
devn = grub_strtoul (ptr + 2, (const char **)&ptr, 0);
continue;
}
if (grub_isdigit (ptr[0]))
{
part = grub_strtoul (ptr, (const char **)&ptr, 0);
continue;
}
/* FIXME: isolinux, ntldr, cmldr, *dos, seg, hide
FIXME: sethidden. */
print_string (" # UNSUPPORTED option ");
if (print (outbuf, ptr, grub_strlen (ptr)))
return 0;
print_string ("\n");
break;
}
if (is_fd == -1)
{
print_string (" # no drive specified\n");
break;
}
if (!*ptr)
{
print_string (is_fd ? " root=fd": " root=hd");
if (print_num (outbuf, devn))
return grub_errno;
if (part != -1)
{
print_string (",");
if (print_num (outbuf, part + 1))
return grub_errno;
}
print_string (";\n");
if (file)
{
print_string (" chainloader ");
print_file (outbuf, menu, file, NULL);
print_string (";\n");
}
else
print_string (" chainloader +1;\n");
if (swap)
print_string (" drivemap -s hd0 \"root\";\n");
}
break;
}
if (grub_strcasecmp (basename, "mboot.c32") == 0)
{
char *ptr;
int first = 1;
int is_kernel = 1;
for (ptr = curentry->append; *ptr; )
{
char *ptrr = ptr;
while (*ptr && !grub_isspace (*ptr))
ptr++;
if (ptrr + 2 == ptr && ptrr[0] == '-' && ptrr[1] == '-')
{
print_string ("\n");
first = 1;
continue;
}
if (first)
{
if (is_kernel)
print_string (" multiboot ");
else
print_string (" module ");
first = 0;
is_kernel = 0;
if (print_file (outbuf, menu, ptrr, ptr))
return grub_errno;
continue;
}
if (print_escaped (outbuf, ptrr, ptr))
return grub_errno;
}
break;
}
if (grub_strcasecmp (basename, "ifcpu64.c32") == 0)
{
char *lm, *lme, *pae = 0, *paee = 0, *i386s = 0, *i386e = 0;
char *ptr;
ptr = curentry->append;
while (grub_isspace (*ptr))
ptr++;
lm = ptr;
while (*ptr && !grub_isspace (*ptr))
ptr++;
lme = ptr;
while (grub_isspace (*ptr))
ptr++;
if (ptr[0] == '-' && ptr[1] == '-')
{
ptr += 2;
while (grub_isspace (*ptr))
ptr++;
pae = ptr;
while (*ptr && !grub_isspace (*ptr))
ptr++;
paee = ptr;
}
while (grub_isspace (*ptr))
ptr++;
if (ptr[0] == '-' && ptr[1] == '-')
{
ptr += 2;
while (grub_isspace (*ptr))
ptr++;
i386s = ptr;
while (*ptr && !grub_isspace (*ptr))
ptr++;
i386e = ptr;
}
*lme = '\0';
if (paee)
*paee = '\0';
if (i386e)
*i386e = '\0';
if (!i386s)
{
i386s = pae;
pae = 0;
}
print_string ("if cpuid --long-mode; then true;\n");
if (print_entry (outbuf, menu, lm))
return grub_errno;
if (pae)
{
print_string ("elif cpuid --pae; then true;\n");
if (print_entry (outbuf, menu, pae))
return grub_errno;
}
print_string ("else\n");
if (print_entry (outbuf, menu, i386s))
return grub_errno;
print_string ("fi\n");
break;
}
if (grub_strcasecmp (basename, "reboot.c32") == 0)
{
print_string (" reboot\n");
break;
}
if (grub_strcasecmp (basename, "poweroff.com") == 0)
{
print_string (" halt\n");
break;
}
if (grub_strcasecmp (basename, "whichsys.c32") == 0)
{
grub_syslinux_flavour_t flavour = GRUB_SYSLINUX_ISOLINUX;
const char *flav[] =
{
[GRUB_SYSLINUX_ISOLINUX] = "iso",
[GRUB_SYSLINUX_PXELINUX] = "pxe",
[GRUB_SYSLINUX_SYSLINUX] = "sys"
};
char *ptr;
for (ptr = curentry->append; *ptr; )
{
char *bptr, c;
while (grub_isspace (*ptr))
ptr++;
if (grub_strncasecmp (ptr, "-iso-", 5) == 0)
{
ptr += sizeof ("-iso-") - 1;
flavour = GRUB_SYSLINUX_ISOLINUX;
continue;
}
if (grub_strncasecmp (ptr, "-pxe-", 5) == 0)
{
ptr += sizeof ("-pxe-") - 1;
flavour = GRUB_SYSLINUX_PXELINUX;
continue;
}
if (grub_strncasecmp (ptr, "-sys-", 5) == 0)
{
ptr += sizeof ("-sys-") - 1;
flavour = GRUB_SYSLINUX_SYSLINUX;
continue;
}
bptr = ptr;
while (*ptr && !grub_isspace (*ptr))
ptr++;
c = *ptr;
*ptr = '\0';
if (menu->flavour == GRUB_SYSLINUX_UNKNOWN
&& flavour == GRUB_SYSLINUX_ISOLINUX)
{
print_string ("if [ x$syslinux_flavour = xiso -o x$syslinux_flavour = x ]; then true;\n");
menu->flavour = GRUB_SYSLINUX_ISOLINUX;
print_entry (outbuf, menu, bptr);
menu->flavour = GRUB_SYSLINUX_UNKNOWN;
print_string ("fi\n");
}
else if (menu->flavour == GRUB_SYSLINUX_UNKNOWN)
{
print_string ("if [ x$syslinux_flavour = x");
err = print (outbuf, flav[flavour], grub_strlen (flav[flavour]));
if (err)
return err;
print_string (" ]; then true;\n");
menu->flavour = flavour;
print_entry (outbuf, menu, bptr);
menu->flavour = GRUB_SYSLINUX_UNKNOWN;
print_string ("fi\n");
}
if (menu->flavour != GRUB_SYSLINUX_UNKNOWN
&& menu->flavour == flavour)
print_entry (outbuf, menu, bptr);
*ptr = c;
}
break;
}
if (grub_strcasecmp (basename, "menu.c32") == 0 ||
grub_strcasecmp (basename, "vesamenu.c32") == 0)
{
char *ptr;
char *end;
ptr = curentry->append;
if (!ptr)
return grub_errno;
while (*ptr)
{
end = ptr;
for (end = ptr; *end && !grub_isspace (*end); end++);
if (*end)
*end++ = '\0';
/* "~" is supposed to be current file, so let's skip it */
if (grub_strcmp (ptr, "~") != 0)
{
err = print_config (outbuf, menu, ptr, "");
if (err != GRUB_ERR_NONE)
break;
}
for (ptr = end; *ptr && grub_isspace (*ptr); ptr++);
}
err = GRUB_ERR_NONE;
break;
}
/* FIXME: gdb, GFXBoot, Hdt, Ifcpu, Ifplop, Kbdmap,
FIXME: Linux, Lua, Meminfo, rosh, Sanbboot */
print_string (" # UNSUPPORTED com(32) ");
err = print (outbuf, basename, grub_strlen (basename));
if (err)
return err;
print_string ("\ntrue;\n");
break;
}
case KERNEL_CONFIG:
{
const char *ap;
ap = curentry->append;
if (!ap)
ap = curentry->argument;
if (!ap)
ap = "";
print_config (outbuf, menu, curentry->kernel_file, ap);
}
break;
case KERNEL_NO_KERNEL:
/* FIXME: support this. */
case KERNEL_BIN:
case KERNEL_PXE:
case KERNEL_IMG:
print_string (" # UNSUPPORTED entry type ");
if (print_num (outbuf, curentry->entry_type))
return grub_errno;
print_string ("\ntrue;\n");
break;
}
return GRUB_ERR_NONE;
}
static grub_err_t
print_entry (struct output_buffer *outbuf,
struct syslinux_menu *menu,
const char *str)
{
struct syslinux_menuentry *curentry;
for (curentry = menu->entries; curentry; curentry = curentry->next)
if (grub_strcasecmp (curentry->label, str) == 0)
{
grub_err_t err;
err = write_entry (outbuf, menu, curentry);
if (err)
return err;
}
return GRUB_ERR_NONE;
}
static void
free_menu (struct syslinux_menu *menu)
{
struct syslinux_say *say, *nsay;
struct syslinux_menuentry *entry, *nentry;
grub_free (menu->def);
grub_free (menu->comments);
grub_free (menu->background);
for (say = menu->say; say ; say = nsay)
{
nsay = say->next;
grub_free (say);
}
for (entry = menu->entries; entry ; entry = nentry)
{
nentry = entry->next;
struct initrd_list *initrd, *ninitrd;
for (initrd = entry->initrds; initrd ; initrd = ninitrd)
{
ninitrd = initrd->next;
grub_free (initrd->file);
grub_free (initrd);
}
grub_free (entry->comments);
grub_free (entry->kernel_file);
grub_free (entry->label);
grub_free (entry->extlabel);
grub_free (entry->append);
grub_free (entry->help);
grub_free (entry);
}
}
static grub_err_t
config_file (struct output_buffer *outbuf,
const char *root, const char *target_root,
const char *cwd, const char *target_cwd,
const char *fname, struct syslinux_menu *parent,
grub_syslinux_flavour_t flav)
{
grub_err_t err;
struct syslinux_menu menu;
struct syslinux_menuentry *curentry, *lentry;
struct syslinux_say *say;
grub_memset (&menu, 0, sizeof (menu));
menu.flavour = flav;
menu.root_read_directory = root;
menu.root_target_directory = target_root;
menu.current_read_directory = cwd;
menu.current_target_directory = target_cwd;
menu.filename = fname;
menu.parent = parent;
err = syslinux_parse_real (&menu);
if (err)
return err;
for (say = menu.say; say && say->next; say = say->next);
for (; say && say->prev; say = say->prev)
{
print_string ("echo ");
err = print_escaped (outbuf, say->msg, NULL);
if (err)
return err;
print_string ("\n");
}
if (menu.background)
{
print_string (" background_image ");
err = print_file (outbuf, &menu, menu.background, NULL);
if (err)
return err;
print_string ("\n");
}
if (menu.comments)
{
err = print (outbuf, menu.comments, grub_strlen (menu.comments));
if (err)
return err;
}
if (menu.timeout == 0 && menu.entries && menu.def)
{
err = print_entry (outbuf, &menu, menu.def);
if (err)
return err;
}
else if (menu.entries)
{
for (curentry = menu.entries; curentry->next; curentry = curentry->next);
lentry = curentry;
print_string ("set timeout=");
err = print_num (outbuf, (menu.timeout + 9) / 10);
if (err)
return err;
print_string ("\n");
if (menu.def)
{
print_string (" default=");
err = print_escaped (outbuf, menu.def, NULL);
if (err)
return err;
print_string ("\n");
}
for (curentry = lentry; curentry; curentry = curentry->prev)
{
print_string ("menuentry ");
err = print_escaped (outbuf,
curentry->extlabel ? : curentry->label, NULL);
if (err)
return err;
if (curentry->hotkey)
{
char hk[] = { curentry->hotkey, '\0' };
print_string (" --hotkey '");
print_string (hk);
print_string ("'");
}
print_string (" --id ");
err = print_escaped (outbuf, curentry->label, NULL);
if (err)
return err;
print_string (" {\n");
err = write_entry (outbuf, &menu, curentry);
if (err)
return err;
print_string ("}\n");
}
}
free_menu (&menu);
return GRUB_ERR_NONE;
}
char *
grub_syslinux_config_file (const char *base, const char *target_base,
const char *cwd, const char *target_cwd,
const char *fname, grub_syslinux_flavour_t flav)
{
struct output_buffer outbuf = { 0, 0, 0 };
grub_err_t err;
err = config_file (&outbuf, base, target_base, cwd, target_cwd,
fname, NULL, flav);
if (err)
return NULL;
err = print (&outbuf, "\0", 1);
if (err)
return NULL;
return outbuf.buf;
}
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