grub/grub-core/net/tftp.c

445 lines
11 KiB
C
Raw Normal View History

/*
* 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>
#include <grub/priority_queue.h>
2011-05-12 18:40:54 +00:00
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,
};
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[0];
} 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;
struct grub_error_saved save_err;
2011-07-08 12:41:52 +00:00
grub_net_udp_socket_t sock;
grub_priority_queue_t pq;
} *tftp_data_t;
static int
cmp (const void *a__, const void *b__)
{
struct grub_net_buff *a_ = *(struct grub_net_buff **) a__;
struct grub_net_buff *b_ = *(struct grub_net_buff **) b__;
struct tftphdr *a = (struct tftphdr *) a_->data;
struct tftphdr *b = (struct tftphdr *) b_->data;
/* We want the first elements to be on top. */
if (grub_be_to_cpu16 (a->u.data.block) < grub_be_to_cpu16 (b->u.data.block))
return +1;
if (grub_be_to_cpu16 (a->u.data.block) > grub_be_to_cpu16 (b->u.data.block))
return -1;
return 0;
}
static grub_err_t
ack (grub_net_udp_socket_t sock, grub_uint16_t block)
{
struct tftphdr *tftph_ack;
grub_uint8_t nbdata[512];
struct grub_net_buff nb_ack;
grub_err_t err;
nb_ack.head = nbdata;
nb_ack.end = nbdata + sizeof (nbdata);
grub_netbuff_clear (&nb_ack);
grub_netbuff_reserve (&nb_ack, 512);
err = grub_netbuff_push (&nb_ack, sizeof (tftph_ack->opcode)
+ sizeof (tftph_ack->u.ack.block));
if (err)
return err;
tftph_ack = (struct tftphdr *) nb_ack.data;
tftph_ack->opcode = grub_cpu_to_be16 (TFTP_ACK);
tftph_ack->u.ack.block = block;
err = grub_net_send_udp_packet (sock, &nb_ack);
return err;
}
static grub_err_t
2011-07-08 12:41:52 +00:00
tftp_receive (grub_net_udp_socket_t sock __attribute__ ((unused)),
struct grub_net_buff *nb,
void *f)
{
grub_file_t file = f;
struct tftphdr *tftph = (void *) nb->data;
tftp_data_t data = file->data;
grub_err_t err;
2011-07-08 22:27:27 +00:00
grub_uint8_t *ptr;
if (nb->tail - nb->data < (grub_ssize_t) sizeof (tftph->opcode))
return grub_error (GRUB_ERR_OUT_OF_RANGE, "TFTP packet too small");
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)
2011-07-08 22:27:27 +00:00
data->file_size = grub_strtoul ((char *) ptr + sizeof ("tsize\0")
- 1, 0, 0);
if (grub_memcmp (ptr, "blksize\0", sizeof ("blksize\0") - 1) == 0)
2011-07-08 22:27:27 +00:00
data->block_size = grub_strtoul ((char *) ptr + sizeof ("blksize\0")
- 1, 0, 0);
while (ptr < nb->tail && *ptr)
ptr++;
ptr++;
}
data->block = 0;
grub_netbuff_free (nb);
err = ack (data->sock, 0);
grub_error_save (&data->save_err);
if (err)
return err;
return GRUB_ERR_NONE;
case TFTP_DATA:
if (nb->tail - nb->data < (grub_ssize_t) (sizeof (tftph->opcode)
+ sizeof (tftph->u.data.block)))
return grub_error (GRUB_ERR_OUT_OF_RANGE, "TFTP packet too small");
err = ack (data->sock, tftph->u.data.block);
if (err)
return err;
err = grub_priority_queue_push (data->pq, &nb);
if (err)
return err;
{
struct grub_net_buff **nb_top_p, *nb_top;
while (1)
{
nb_top_p = grub_priority_queue_top (data->pq);
if (!nb_top_p)
return GRUB_ERR_NONE;
nb_top = *nb_top_p;
tftph = (struct tftphdr *) nb_top->data;
if (grub_be_to_cpu16 (tftph->u.data.block) >= data->block + 1)
break;
grub_priority_queue_pop (data->pq);
}
if (grub_be_to_cpu16 (tftph->u.data.block) == data->block + 1)
{
unsigned size;
grub_priority_queue_pop (data->pq);
err = grub_netbuff_pull (nb_top, sizeof (tftph->opcode) +
sizeof (tftph->u.data.block));
if (err)
return err;
size = nb_top->tail - nb_top->data;
data->block++;
if (size < data->block_size)
{
file->device->net->eof = 1;
grub_net_udp_close (data->sock);
data->sock = NULL;
}
/* Prevent garbage in broken cards. Is it still necessary
given that IP implementation has been fixed?
*/
if (size > data->block_size)
{
err = grub_netbuff_unput (nb_top, size - data->block_size);
if (err)
return err;
}
/* If there is data, puts packet in socket list. */
if ((nb_top->tail - nb_top->data) > 0)
grub_net_put_packet (&file->device->net->packs, nb_top);
else
grub_netbuff_free (nb);
}
}
return GRUB_ERR_NONE;
case TFTP_ERROR:
data->have_oack = 1;
grub_netbuff_free (nb);
grub_error (GRUB_ERR_IO, (char *) tftph->u.err.errmsg);
grub_error_save (&data->save_err);
return GRUB_ERR_NONE;
default:
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
}
static void
destroy_pq (tftp_data_t data)
{
struct grub_net_buff **nb_p;
while ((nb_p = grub_priority_queue_top (data->pq)))
grub_netbuff_free (*nb_p);
grub_priority_queue_destroy (data->pq);
}
2011-06-08 00:59:53 +00:00
static grub_err_t
tftp_open (struct grub_file *file, const char *filename)
{
2011-06-08 00:59:53 +00:00
struct tftphdr *tftph;
char *rrq;
2011-04-01 08:42:34 +00:00
int i;
int rrqlen;
2011-04-01 08:42:34 +00:00
int hdrlen;
2011-07-08 22:27:27 +00:00
grub_uint8_t open_data[1500];
2011-04-01 08:42:34 +00:00
struct grub_net_buff nb;
2011-05-19 13:39:34 +00:00
tftp_data_t data;
grub_err_t err;
2011-07-10 06:46:48 +00:00
grub_uint8_t *nbd;
2011-10-14 17:21:59 +00:00
grub_net_network_level_address_t addr;
2011-05-19 13:39:34 +00:00
data = grub_zalloc (sizeof (*data));
2011-05-19 13:39:34 +00:00
if (!data)
return grub_errno;
2011-06-08 00:59:53 +00:00
2011-04-01 08:42:34 +00:00
nb.head = open_data;
nb.end = open_data + sizeof (open_data);
2011-06-08 00:59:53 +00:00
grub_netbuff_clear (&nb);
2011-06-08 00:59:53 +00:00
grub_netbuff_reserve (&nb, 1500);
err = grub_netbuff_push (&nb, sizeof (*tftph));
if (err)
return err;
2011-06-08 00:59:53 +00:00
tftph = (struct tftphdr *) nb.data;
2010-09-22 22:45:39 +00:00
rrq = (char *) tftph->u.rrq;
rrqlen = 0;
2011-06-08 00:59:53 +00:00
2010-09-22 22:45:39 +00:00
tftph->opcode = grub_cpu_to_be16 (TFTP_RRQ);
grub_strcpy (rrq, filename);
rrqlen += grub_strlen (filename) + 1;
2011-06-08 00:59:53 +00:00
rrq += grub_strlen (filename) + 1;
grub_strcpy (rrq, "octet");
rrqlen += grub_strlen ("octet") + 1;
2011-06-08 00:59:53 +00:00
rrq += grub_strlen ("octet") + 1;
2011-06-08 00:59:53 +00:00
grub_strcpy (rrq, "blksize");
rrqlen += grub_strlen ("blksize") + 1;
rrq += grub_strlen ("blksize") + 1;
2011-06-08 00:59:53 +00:00
grub_strcpy (rrq, "1024");
rrqlen += grub_strlen ("1024") + 1;
2011-06-08 00:59:53 +00:00
rrq += grub_strlen ("1024") + 1;
grub_strcpy (rrq, "tsize");
rrqlen += grub_strlen ("tsize") + 1;
2011-06-08 00:59:53 +00:00
rrq += grub_strlen ("tsize") + 1;
2011-06-08 00:59:53 +00:00
grub_strcpy (rrq, "0");
rrqlen += grub_strlen ("0") + 1;
2010-09-22 22:45:39 +00:00
rrq += grub_strlen ("0") + 1;
hdrlen = sizeof (tftph->opcode) + rrqlen;
2011-06-08 00:59:53 +00:00
2011-07-02 16:05:40 +00:00
err = grub_netbuff_unput (&nb, nb.tail - (nb.data + hdrlen));
if (err)
return err;
2010-09-22 22:45:39 +00:00
file->not_easily_seekable = 1;
file->data = data;
data->pq = grub_priority_queue_new (sizeof (struct grub_net_buff *), cmp);
if (!data->pq)
return grub_errno;
2011-10-14 17:21:59 +00:00
err = grub_net_resolve_address (file->device->net->server, &addr);
2010-09-22 22:45:39 +00:00
if (err)
{
2011-10-14 17:21:59 +00:00
destroy_pq (data);
return err;
}
2010-09-22 22:45:39 +00:00
2011-10-14 17:21:59 +00:00
data->sock = grub_net_udp_open (addr,
TFTP_SERVER_PORT, tftp_receive,
file);
if (!data->sock)
{
destroy_pq (data);
return grub_errno;
}
2011-04-01 08:42:34 +00:00
/* Receive OACK packet. */
2011-07-10 06:46:48 +00:00
nbd = nb.data;
for (i = 0; i < GRUB_NET_TRIES; i++)
2010-09-22 22:45:39 +00:00
{
2011-07-10 06:46:48 +00:00
nb.data = nbd;
err = grub_net_send_udp_packet (data->sock, &nb);
2011-06-26 15:18:53 +00:00
if (err)
2011-04-01 08:42:34 +00:00
{
grub_net_udp_close (data->sock);
destroy_pq (data);
return err;
2011-04-01 08:42:34 +00:00
}
grub_net_poll_cards (GRUB_NET_INTERVAL);
2011-07-10 06:46:48 +00:00
if (data->have_oack)
break;
2011-06-08 00:59:53 +00:00
}
if (!data->have_oack)
grub_error (GRUB_ERR_TIMEOUT, "Time out opening tftp.");
else
grub_error_load (&data->save_err);
if (grub_errno)
{
grub_net_udp_close (data->sock);
destroy_pq (data);
return grub_errno;
}
file->size = data->file_size;
return GRUB_ERR_NONE;
}
2011-06-08 00:59:53 +00:00
static grub_err_t
tftp_close (struct grub_file *file)
{
tftp_data_t data = file->data;
if (data->sock)
{
2011-07-08 22:27:27 +00:00
grub_uint8_t 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);
}
destroy_pq (data);
grub_free (data);
2011-05-10 17:07:54 +00:00
return GRUB_ERR_NONE;
}
2011-04-01 08:42:34 +00:00
static struct grub_net_app_protocol grub_tftp_protocol =
2011-06-08 00:59:53 +00:00
{
.name = "tftp",
.open = tftp_open,
.close = tftp_close
};
2011-06-24 18:35:25 +00:00
GRUB_MOD_INIT (tftp)
{
grub_net_app_level_register (&grub_tftp_protocol);
}
2011-06-24 18:35:25 +00:00
GRUB_MOD_FINI (tftp)
{
grub_net_app_level_unregister (&grub_tftp_protocol);
}