/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2010,2011 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/misc.h>
#include <grub/net/udp.h>
#include <grub/net/ip.h>
#include <grub/net/ethernet.h>
#include <grub/net/netbuff.h>
#include <grub/net.h>
#include <grub/mm.h>
#include <grub/dl.h>
#include <grub/file.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* IP port for the MTFTP server used for Intel's PXE */
enum
{
MTFTP_SERVER_PORT = 75,
MTFTP_CLIENT_PORT = 76,
/* IP port for the TFTP server */
TFTP_SERVER_PORT = 69
};
enum
{
TFTP_DEFAULTSIZE_PACKET = 512,
TFTP_MAX_PACKET = 1432
};
enum
{
TFTP_CODE_EOF = 1,
TFTP_CODE_MORE = 2,
TFTP_CODE_ERROR = 3,
TFTP_CODE_BOOT = 4,
TFTP_CODE_CFG = 5
};
enum
{
TFTP_RRQ = 1,
TFTP_WRQ = 2,
TFTP_DATA = 3,
TFTP_ACK = 4,
TFTP_ERROR = 5,
TFTP_OACK = 6
};
enum
{
TFTP_EUNDEF = 0, /* not defined */
TFTP_ENOTFOUND = 1, /* file not found */
TFTP_EACCESS = 2, /* access violation */
TFTP_ENOSPACE = 3, /* disk full or allocation exceeded */
TFTP_EBADOP = 4, /* illegal TFTP operation */
TFTP_EBADID = 5, /* unknown transfer ID */
TFTP_EEXISTS = 6, /* file already exists */
TFTP_ENOUSER = 7 /* no such user */
};
struct tftphdr {
grub_uint16_t opcode;
union {
grub_int8_t rrq[TFTP_DEFAULTSIZE_PACKET];
struct {
grub_uint16_t block;
grub_int8_t download[TFTP_MAX_PACKET];
} data;
struct {
grub_uint16_t block;
} ack;
struct {
grub_uint16_t errcode;
grub_int8_t errmsg[TFTP_DEFAULTSIZE_PACKET];
} err;
struct {
grub_int8_t data[TFTP_DEFAULTSIZE_PACKET+2];
} oack;
} u;
} __attribute__ ((packed)) ;
typedef struct tftp_data
{
grub_uint64_t file_size;
grub_uint64_t block;
grub_uint32_t block_size;
int have_oack;
grub_net_socket_t sock;
} *tftp_data_t;
static grub_err_t
tftp_receive (grub_net_socket_t sock __attribute__ ((unused)),
struct grub_net_buff *nb,
void *f)
{
grub_file_t file = f;
struct tftphdr *tftph = (void *) nb->data;
char nbdata[512];
tftp_data_t data = file->data;
grub_err_t err;
char *ptr;
struct grub_net_buff nb_ack;
nb_ack.head = nbdata;
nb_ack.end = nbdata + sizeof (nbdata);
tftph = (struct tftphdr *) nb->data;
switch (grub_be_to_cpu16 (tftph->opcode))
{
case TFTP_OACK:
data->block_size = TFTP_DEFAULTSIZE_PACKET;
data->have_oack = 1;
for (ptr = nb->data + sizeof (tftph->opcode); ptr < nb->tail;)
{
if (grub_memcmp (ptr, "tsize\0", sizeof ("tsize\0") - 1) == 0)
{
data->file_size = grub_strtoul (ptr + sizeof ("tsize\0") - 1,
0, 0);
}
if (grub_memcmp (ptr, "blksize\0", sizeof ("blksize\0") - 1) == 0)
{
data->block_size = grub_strtoul (ptr + sizeof ("blksize\0") - 1,
0, 0);
}
while (ptr < nb->tail && *ptr)
ptr++;
ptr++;
}
data->block = 0;
grub_netbuff_free (nb);
break;
case TFTP_DATA:
err = grub_netbuff_pull (nb, sizeof (tftph->opcode) +
sizeof (tftph->u.data.block));
if (err)
return err;
if (grub_be_to_cpu16 (tftph->u.data.block) == data->block + 1)
{
unsigned size = nb->tail - nb->data;
data->block++;
if (size < data->block_size)
{
file->device->net->eof = 1;
}
/* Prevent garbage in broken cards. */
if (size > data->block_size)
{
err = grub_netbuff_unput (nb, size - data->block_size);
if (err)
return err;
}
/* If there is data, puts packet in socket list. */
if ((nb->tail - nb->data) > 0)
grub_net_put_packet (&file->device->net->packs, nb);
else
grub_netbuff_free (nb);
}
else
{
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
break;
case TFTP_ERROR:
grub_netbuff_free (nb);
return grub_error (GRUB_ERR_IO, (char *) tftph->u.err.errmsg);
}
grub_netbuff_clear (&nb_ack);
grub_netbuff_reserve (&nb_ack, 512);
err = grub_netbuff_push (&nb_ack, sizeof (tftph->opcode)
+ sizeof (tftph->u.ack.block));
if (err)
return err;
tftph = (struct tftphdr *) nb_ack.data;
tftph->opcode = grub_cpu_to_be16 (TFTP_ACK);
tftph->u.ack.block = grub_cpu_to_be16 (data->block);
err = grub_net_send_udp_packet (data->sock, &nb_ack);
if (file->device->net->eof)
{
grub_net_udp_close (data->sock);
data->sock = NULL;
}
return err;
}
static grub_err_t
tftp_open (struct grub_file *file, const char *filename)
{
struct tftphdr *tftph;
char *rrq;
int i;
int rrqlen;
int hdrlen;
char open_data[1500];
struct grub_net_buff nb;
tftp_data_t data;
grub_err_t err;
data = grub_zalloc (sizeof (*data));
if (!data)
return grub_errno;
nb.head = open_data;
nb.end = open_data + sizeof (open_data);
grub_netbuff_clear (&nb);
grub_netbuff_reserve (&nb, 1500);
err = grub_netbuff_push (&nb, sizeof (*tftph));
if (err)
return err;
tftph = (struct tftphdr *) nb.data;
rrq = (char *) tftph->u.rrq;
rrqlen = 0;
tftph->opcode = grub_cpu_to_be16 (TFTP_RRQ);
grub_strcpy (rrq, filename);
rrqlen += grub_strlen (filename) + 1;
rrq += grub_strlen (filename) + 1;
grub_strcpy (rrq, "octet");
rrqlen += grub_strlen ("octet") + 1;
rrq += grub_strlen ("octet") + 1;
grub_strcpy (rrq, "blksize");
rrqlen += grub_strlen ("blksize") + 1;
rrq += grub_strlen ("blksize") + 1;
grub_strcpy (rrq, "1024");
rrqlen += grub_strlen ("1024") + 1;
rrq += grub_strlen ("1024") + 1;
grub_strcpy (rrq, "tsize");
rrqlen += grub_strlen ("tsize") + 1;
rrq += grub_strlen ("tsize") + 1;
grub_strcpy (rrq, "0");
rrqlen += grub_strlen ("0") + 1;
rrq += grub_strlen ("0") + 1;
hdrlen = sizeof (tftph->opcode) + rrqlen;
err = grub_netbuff_unput (&nb, nb.tail - (nb.data + hdrlen));
if (err)
return err;
file->not_easily_seekable = 1;
file->data = data;
data->sock = grub_net_udp_open (file->device->net->server,
TFTP_SERVER_PORT, tftp_receive,
file);
if (!data->sock)
return grub_errno;
err = grub_net_send_udp_packet (data->sock, &nb);
if (err)
{
grub_net_udp_close (data->sock);
return err;
}
/* Receive OACK packet. */
for (i = 0; i < 3; i++)
{
grub_net_poll_cards (100);
if (grub_errno)
return grub_errno;
if (data->have_oack)
break;
/* Retry. */
err = grub_net_send_udp_packet (data->sock, &nb);
if (err)
{
grub_net_udp_close (data->sock);
return err;
}
}
if (!data->have_oack)
{
grub_net_udp_close (data->sock);
return grub_error (GRUB_ERR_TIMEOUT, "Time out opening tftp.");
}
file->size = data->file_size;
return GRUB_ERR_NONE;
}
static grub_err_t
tftp_close (struct grub_file *file)
{
tftp_data_t data = file->data;
if (data->sock)
{
char nbdata[512];
grub_err_t err;
struct grub_net_buff nb_err;
struct tftphdr *tftph;
nb_err.head = nbdata;
nb_err.end = nbdata + sizeof (nbdata);
grub_netbuff_clear (&nb_err);
grub_netbuff_reserve (&nb_err, 512);
err = grub_netbuff_push (&nb_err, sizeof (tftph->opcode)
+ sizeof (tftph->u.err.errcode)
+ sizeof ("closed"));
if (!err)
{
tftph = (struct tftphdr *) nb_err.data;
tftph->opcode = grub_cpu_to_be16 (TFTP_ERROR);
tftph->u.err.errcode = grub_cpu_to_be16 (TFTP_EUNDEF);
grub_memcpy (tftph->u.err.errmsg, "closed", sizeof ("closed"));
err = grub_net_send_udp_packet (data->sock, &nb_err);
}
if (err)
grub_print_error ();
grub_net_udp_close (data->sock);
}
grub_free (data);
return GRUB_ERR_NONE;
}
static struct grub_net_app_protocol grub_tftp_protocol =
{
.name = "tftp",
.open = tftp_open,
.close = tftp_close
};
GRUB_MOD_INIT (tftp)
{
grub_net_app_level_register (&grub_tftp_protocol);
}
GRUB_MOD_FINI (tftp)
{
grub_net_app_level_unregister (&grub_tftp_protocol);
}