9a09392057
* grub-core/fs/i386/pc/pxe.c (grub_pxe_pxenv): Put correct type bangpxe. (grub_pxe_scan): Fix types and pxe_rm_entry computation. All users updated. * include/grub/i386/pc/pxe.h (grub_pxe_bangpxe): New struct. (grub_pxe_pxenv): Correct type.
641 lines
15 KiB
C
641 lines
15 KiB
C
/* pxe.c - Driver to provide access to the pxe filesystem */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/fs.h>
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#include <grub/mm.h>
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#include <grub/disk.h>
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#include <grub/file.h>
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#include <grub/misc.h>
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#include <grub/bufio.h>
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#include <grub/env.h>
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#include <grub/machine/pxe.h>
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#include <grub/machine/int.h>
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#include <grub/machine/memory.h>
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#define SEGMENT(x) ((x) >> 4)
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#define OFFSET(x) ((x) & 0xF)
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#define SEGOFS(x) ((SEGMENT(x) << 16) + OFFSET(x))
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#define LINEAR(x) (void *) (((x >> 16) <<4) + (x & 0xFFFF))
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struct grub_pxe_disk_data
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{
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grub_uint32_t server_ip;
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grub_uint32_t gateway_ip;
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};
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struct grub_pxe_bangpxe *grub_pxe_pxenv;
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static grub_uint32_t grub_pxe_your_ip;
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static grub_uint32_t grub_pxe_default_server_ip;
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static grub_uint32_t grub_pxe_default_gateway_ip;
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static unsigned grub_pxe_blksize = GRUB_PXE_MIN_BLKSIZE;
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static grub_file_t curr_file = 0;
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struct grub_pxe_data
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{
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grub_uint32_t packet_number;
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grub_uint32_t block_size;
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char filename[0];
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};
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static grub_uint32_t pxe_rm_entry = 0;
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static struct grub_pxe_bangpxe *
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grub_pxe_scan (void)
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{
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struct grub_bios_int_registers regs;
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struct grub_pxenv *pxenv;
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struct grub_pxe_bangpxe *bangpxe;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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regs.ebx = 0;
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regs.ecx = 0;
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regs.eax = 0x5650;
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regs.es = 0;
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grub_bios_interrupt (0x1a, ®s);
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if ((regs.eax & 0xffff) != 0x564e)
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return NULL;
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pxenv = (struct grub_pxenv *) ((regs.es << 4) + (regs.ebx & 0xffff));
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if (grub_memcmp (pxenv->signature, GRUB_PXE_SIGNATURE,
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sizeof (pxenv->signature))
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!= 0)
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return NULL;
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if (pxenv->version < 0x201)
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return NULL;
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bangpxe = (void *) ((((pxenv->pxe_ptr & 0xffff0000) >> 16) << 4)
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+ (pxenv->pxe_ptr & 0xffff));
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if (!bangpxe)
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return NULL;
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if (grub_memcmp (bangpxe->signature, GRUB_PXE_BANGPXE_SIGNATURE,
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sizeof (bangpxe->signature)) != 0)
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return NULL;
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pxe_rm_entry = bangpxe->rm_entry;
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return bangpxe;
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}
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static int
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grub_pxe_iterate (int (*hook) (const char *name))
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{
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if (hook ("pxe"))
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return 1;
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return 0;
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}
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static grub_err_t
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parse_ip (const char *val, grub_uint32_t *ip, const char **rest)
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{
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grub_uint32_t newip = 0;
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unsigned long t;
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int i;
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const char *ptr = val;
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for (i = 0; i < 4; i++)
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{
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t = grub_strtoul (ptr, (char **) &ptr, 0);
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if (grub_errno)
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return grub_errno;
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if (t & ~0xff)
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "Invalid IP.");
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newip >>= 8;
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newip |= (t << 24);
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if (i != 3 && *ptr != '.')
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "Invalid IP.");
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ptr++;
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}
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*ip = newip;
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if (rest)
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*rest = ptr - 1;
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return 0;
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}
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static grub_err_t
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grub_pxe_open (const char *name, grub_disk_t disk)
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{
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struct grub_pxe_disk_data *data;
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if (grub_strcmp (name, "pxe") != 0
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&& grub_strncmp (name, "pxe:", sizeof ("pxe:") - 1) != 0)
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a pxe disk");
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data = grub_malloc (sizeof (*data));
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if (!data)
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return grub_errno;
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if (grub_strncmp (name, "pxe:", sizeof ("pxe:") - 1) == 0)
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{
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const char *ptr;
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grub_err_t err;
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ptr = name + sizeof ("pxe:") - 1;
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err = parse_ip (ptr, &(data->server_ip), &ptr);
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if (err)
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return err;
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if (*ptr == ':')
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{
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err = parse_ip (ptr + 1, &(data->gateway_ip), 0);
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if (err)
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return err;
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}
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else
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data->gateway_ip = grub_pxe_default_gateway_ip;
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}
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else
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{
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data->server_ip = grub_pxe_default_server_ip;
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data->gateway_ip = grub_pxe_default_gateway_ip;
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}
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disk->total_sectors = 0;
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disk->id = (unsigned long) data;
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disk->has_partitions = 0;
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disk->data = data;
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return GRUB_ERR_NONE;
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}
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static void
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grub_pxe_close (grub_disk_t disk)
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{
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grub_free (disk->data);
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}
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static grub_err_t
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grub_pxe_read (grub_disk_t disk __attribute((unused)),
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grub_disk_addr_t sector __attribute((unused)),
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grub_size_t size __attribute((unused)),
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char *buf __attribute((unused)))
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{
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return GRUB_ERR_OUT_OF_RANGE;
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}
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static grub_err_t
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grub_pxe_write (grub_disk_t disk __attribute((unused)),
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grub_disk_addr_t sector __attribute((unused)),
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grub_size_t size __attribute((unused)),
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const char *buf __attribute((unused)))
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{
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return GRUB_ERR_OUT_OF_RANGE;
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}
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static struct grub_disk_dev grub_pxe_dev =
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{
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.name = "pxe",
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.id = GRUB_DISK_DEVICE_PXE_ID,
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.iterate = grub_pxe_iterate,
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.open = grub_pxe_open,
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.close = grub_pxe_close,
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.read = grub_pxe_read,
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.write = grub_pxe_write,
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.next = 0
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};
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static grub_err_t
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grub_pxefs_dir (grub_device_t device,
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const char *path __attribute__ ((unused)),
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int (*hook) (const char *filename,
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const struct grub_dirhook_info *info)
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__attribute__ ((unused)))
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{
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if (device->disk->dev->id != GRUB_DISK_DEVICE_PXE_ID)
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return grub_error (GRUB_ERR_IO, "not a pxe disk");
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_pxefs_open (struct grub_file *file, const char *name)
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{
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union
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{
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struct grub_pxenv_tftp_get_fsize c1;
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struct grub_pxenv_tftp_open c2;
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} c;
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struct grub_pxe_data *data;
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struct grub_pxe_disk_data *disk_data = file->device->disk->data;
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grub_file_t file_int, bufio;
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if (file->device->disk->dev->id != GRUB_DISK_DEVICE_PXE_ID)
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return grub_error (GRUB_ERR_IO, "not a pxe disk");
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if (curr_file != 0)
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{
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grub_pxe_call (GRUB_PXENV_TFTP_CLOSE, &c.c2, pxe_rm_entry);
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curr_file = 0;
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}
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c.c1.server_ip = disk_data->server_ip;
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c.c1.gateway_ip = disk_data->gateway_ip;
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grub_strcpy ((char *)&c.c1.filename[0], name);
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grub_pxe_call (GRUB_PXENV_TFTP_GET_FSIZE, &c.c1, pxe_rm_entry);
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if (c.c1.status)
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return grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
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file->size = c.c1.file_size;
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c.c2.tftp_port = grub_cpu_to_be16 (GRUB_PXE_TFTP_PORT);
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c.c2.packet_size = grub_pxe_blksize;
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grub_pxe_call (GRUB_PXENV_TFTP_OPEN, &c.c2, pxe_rm_entry);
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if (c.c2.status)
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return grub_error (GRUB_ERR_BAD_FS, "open fails");
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data = grub_zalloc (sizeof (struct grub_pxe_data) + grub_strlen (name) + 1);
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if (! data)
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return grub_errno;
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data->block_size = c.c2.packet_size;
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grub_strcpy (data->filename, name);
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file_int = grub_malloc (sizeof (*file_int));
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if (! file_int)
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{
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grub_free (data);
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return grub_errno;
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}
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file->data = data;
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grub_memcpy (file_int, file, sizeof (struct grub_file));
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curr_file = file_int;
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bufio = grub_bufio_open (file_int, data->block_size);
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if (! bufio)
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{
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grub_free (file_int);
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grub_free (data);
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return grub_errno;
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}
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grub_memcpy (file, bufio, sizeof (struct grub_file));
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return GRUB_ERR_NONE;
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}
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static grub_ssize_t
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grub_pxefs_read (grub_file_t file, char *buf, grub_size_t len)
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{
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struct grub_pxenv_tftp_read c;
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struct grub_pxe_data *data;
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struct grub_pxe_disk_data *disk_data = file->device->disk->data;
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grub_uint32_t pn, r;
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data = file->data;
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pn = grub_divmod64 (file->offset, data->block_size, &r);
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if (r)
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{
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grub_error (GRUB_ERR_BAD_FS,
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"read access must be aligned to packet size");
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return -1;
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}
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if ((curr_file != file) || (data->packet_number > pn))
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{
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struct grub_pxenv_tftp_open o;
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if (curr_file != 0)
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grub_pxe_call (GRUB_PXENV_TFTP_CLOSE, &o, pxe_rm_entry);
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o.server_ip = disk_data->server_ip;
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o.gateway_ip = disk_data->gateway_ip;
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grub_strcpy ((char *)&o.filename[0], data->filename);
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o.tftp_port = grub_cpu_to_be16 (GRUB_PXE_TFTP_PORT);
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o.packet_size = grub_pxe_blksize;
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grub_pxe_call (GRUB_PXENV_TFTP_OPEN, &o, pxe_rm_entry);
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if (o.status)
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{
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grub_error (GRUB_ERR_BAD_FS, "open fails");
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return -1;
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}
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data->block_size = o.packet_size;
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data->packet_number = 0;
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curr_file = file;
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}
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c.buffer = SEGOFS (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
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while (pn >= data->packet_number)
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{
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c.buffer_size = data->block_size;
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grub_pxe_call (GRUB_PXENV_TFTP_READ, &c, pxe_rm_entry);
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if (c.status)
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{
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grub_error (GRUB_ERR_BAD_FS, "read fails");
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return -1;
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}
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data->packet_number++;
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}
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grub_memcpy (buf, (char *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR, len);
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return len;
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}
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static grub_err_t
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grub_pxefs_close (grub_file_t file)
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{
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struct grub_pxenv_tftp_close c;
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if (curr_file == file)
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{
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grub_pxe_call (GRUB_PXENV_TFTP_CLOSE, &c, pxe_rm_entry);
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curr_file = 0;
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}
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grub_free (file->data);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_pxefs_label (grub_device_t device __attribute ((unused)),
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char **label __attribute ((unused)))
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{
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*label = 0;
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return GRUB_ERR_NONE;
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}
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static struct grub_fs grub_pxefs_fs =
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{
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.name = "pxefs",
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.dir = grub_pxefs_dir,
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.open = grub_pxefs_open,
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.read = grub_pxefs_read,
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.close = grub_pxefs_close,
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.label = grub_pxefs_label,
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.next = 0
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};
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static char *
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grub_env_write_readonly (struct grub_env_var *var __attribute__ ((unused)),
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const char *val __attribute__ ((unused)))
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{
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return NULL;
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}
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static void
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set_mac_env (grub_uint8_t *mac_addr, grub_size_t mac_len)
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{
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char buf[(sizeof ("XX:") - 1) * mac_len + 1];
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char *ptr = buf;
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unsigned i;
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for (i = 0; i < mac_len; i++)
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{
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grub_snprintf (ptr, sizeof (buf) - (ptr - buf),
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"%02x:", mac_addr[i] & 0xff);
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ptr += (sizeof ("XX:") - 1);
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}
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if (mac_len)
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*(ptr - 1) = 0;
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else
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buf[0] = 0;
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grub_env_set ("net_pxe_mac", buf);
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/* XXX: Is it possible to change MAC in PXE? */
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grub_register_variable_hook ("net_pxe_mac", 0, grub_env_write_readonly);
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}
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static void
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set_env_limn_ro (const char *varname, char *value, grub_size_t len)
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{
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char c;
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c = value[len];
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value[len] = 0;
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grub_env_set (varname, value);
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value[len] = c;
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grub_register_variable_hook (varname, 0, grub_env_write_readonly);
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}
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static void
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parse_dhcp_vendor (void *vend, int limit)
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{
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grub_uint8_t *ptr, *ptr0;
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ptr = ptr0 = vend;
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if (grub_be_to_cpu32 (*(grub_uint32_t *) ptr) != 0x63825363)
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return;
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ptr = ptr + sizeof (grub_uint32_t);
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while (ptr - ptr0 < limit)
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{
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grub_uint8_t tagtype;
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grub_uint8_t taglength;
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tagtype = *ptr++;
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/* Pad tag. */
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if (tagtype == 0)
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continue;
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/* End tag. */
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if (tagtype == 0xff)
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return;
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taglength = *ptr++;
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switch (tagtype)
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{
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case 12:
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set_env_limn_ro ("net_pxe_hostname", (char *) ptr, taglength);
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break;
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case 15:
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set_env_limn_ro ("net_pxe_domain", (char *) ptr, taglength);
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break;
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case 17:
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set_env_limn_ro ("net_pxe_rootpath", (char *) ptr, taglength);
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break;
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case 18:
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set_env_limn_ro ("net_pxe_extensionspath", (char *) ptr, taglength);
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break;
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/* If you need any other options please contact GRUB
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developpement team. */
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}
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ptr += taglength;
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}
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}
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static void
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grub_pxe_detect (void)
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{
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struct grub_pxe_bangpxe *pxenv;
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struct grub_pxenv_get_cached_info ci;
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struct grub_pxenv_boot_player *bp;
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pxenv = grub_pxe_scan ();
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if (! pxenv)
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return;
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ci.packet_type = GRUB_PXENV_PACKET_TYPE_DHCP_ACK;
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ci.buffer = 0;
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ci.buffer_size = 0;
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grub_pxe_call (GRUB_PXENV_GET_CACHED_INFO, &ci, pxe_rm_entry);
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if (ci.status)
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return;
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bp = LINEAR (ci.buffer);
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grub_pxe_your_ip = bp->your_ip;
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grub_pxe_default_server_ip = bp->server_ip;
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grub_pxe_default_gateway_ip = bp->gateway_ip;
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|
set_mac_env (bp->mac_addr, bp->hw_len < sizeof (bp->mac_addr) ? bp->hw_len
|
|
: sizeof (bp->mac_addr));
|
|
set_env_limn_ro ("net_pxe_boot_file", (char *) bp->boot_file,
|
|
sizeof (bp->boot_file));
|
|
set_env_limn_ro ("net_pxe_dhcp_server_name", (char *) bp->server_name,
|
|
sizeof (bp->server_name));
|
|
parse_dhcp_vendor (&bp->vendor, sizeof (bp->vendor));
|
|
grub_pxe_pxenv = pxenv;
|
|
}
|
|
|
|
void
|
|
grub_pxe_unload (void)
|
|
{
|
|
if (grub_pxe_pxenv)
|
|
{
|
|
grub_fs_unregister (&grub_pxefs_fs);
|
|
grub_disk_dev_unregister (&grub_pxe_dev);
|
|
|
|
grub_pxe_pxenv = 0;
|
|
}
|
|
}
|
|
|
|
static void
|
|
set_ip_env (char *varname, grub_uint32_t ip)
|
|
{
|
|
char buf[sizeof ("XXX.XXX.XXX.XXX")];
|
|
|
|
grub_snprintf (buf, sizeof (buf), "%d.%d.%d.%d", (ip & 0xff),
|
|
(ip >> 8) & 0xff, (ip >> 16) & 0xff, (ip >> 24) & 0xff);
|
|
grub_env_set (varname, buf);
|
|
}
|
|
|
|
static char *
|
|
write_ip_env (grub_uint32_t *ip, const char *val)
|
|
{
|
|
char *buf;
|
|
grub_err_t err;
|
|
grub_uint32_t newip;
|
|
|
|
err = parse_ip (val, &newip, 0);
|
|
if (err)
|
|
return 0;
|
|
|
|
/* Normalize the IP. */
|
|
buf = grub_xasprintf ("%d.%d.%d.%d", (newip & 0xff), (newip >> 8) & 0xff,
|
|
(newip >> 16) & 0xff, (newip >> 24) & 0xff);
|
|
if (!buf)
|
|
return 0;
|
|
|
|
*ip = newip;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static char *
|
|
grub_env_write_pxe_default_server (struct grub_env_var *var
|
|
__attribute__ ((unused)),
|
|
const char *val)
|
|
{
|
|
return write_ip_env (&grub_pxe_default_server_ip, val);
|
|
}
|
|
|
|
static char *
|
|
grub_env_write_pxe_default_gateway (struct grub_env_var *var
|
|
__attribute__ ((unused)),
|
|
const char *val)
|
|
{
|
|
return write_ip_env (&grub_pxe_default_gateway_ip, val);
|
|
}
|
|
|
|
static char *
|
|
grub_env_write_pxe_blocksize (struct grub_env_var *var __attribute__ ((unused)),
|
|
const char *val)
|
|
{
|
|
unsigned size;
|
|
char *buf;
|
|
|
|
size = grub_strtoul (val, 0, 0);
|
|
if (grub_errno)
|
|
return 0;
|
|
|
|
if (size < GRUB_PXE_MIN_BLKSIZE)
|
|
size = GRUB_PXE_MIN_BLKSIZE;
|
|
else if (size > GRUB_PXE_MAX_BLKSIZE)
|
|
size = GRUB_PXE_MAX_BLKSIZE;
|
|
|
|
buf = grub_xasprintf ("%d", size);
|
|
if (!buf)
|
|
return 0;
|
|
|
|
grub_pxe_blksize = size;
|
|
|
|
return buf;
|
|
}
|
|
|
|
|
|
GRUB_MOD_INIT(pxe)
|
|
{
|
|
grub_pxe_detect ();
|
|
if (grub_pxe_pxenv)
|
|
{
|
|
char *buf;
|
|
|
|
buf = grub_xasprintf ("%d", grub_pxe_blksize);
|
|
if (buf)
|
|
grub_env_set ("pxe_blksize", buf);
|
|
grub_free (buf);
|
|
|
|
set_ip_env ("pxe_default_server", grub_pxe_default_server_ip);
|
|
set_ip_env ("pxe_default_gateway", grub_pxe_default_gateway_ip);
|
|
set_ip_env ("net_pxe_ip", grub_pxe_your_ip);
|
|
grub_register_variable_hook ("pxe_default_server", 0,
|
|
grub_env_write_pxe_default_server);
|
|
grub_register_variable_hook ("pxe_default_gateway", 0,
|
|
grub_env_write_pxe_default_gateway);
|
|
|
|
/* XXX: Is it possible to change IP in PXE? */
|
|
grub_register_variable_hook ("net_pxe_ip", 0,
|
|
grub_env_write_readonly);
|
|
grub_register_variable_hook ("pxe_blksize", 0,
|
|
grub_env_write_pxe_blocksize);
|
|
grub_disk_dev_register (&grub_pxe_dev);
|
|
grub_fs_register (&grub_pxefs_fs);
|
|
}
|
|
}
|
|
|
|
GRUB_MOD_FINI(pxe)
|
|
{
|
|
grub_pxe_unload ();
|
|
}
|