Use priority queue to reassemble TFTP packets
This commit is contained in:
Vladimir 'phcoder' Serbinenko
parent
fecdbd6b17
commit
92bb3cfc17
3 changed files with 135 additions and 56 deletions
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@ -136,7 +136,7 @@ grub_priority_queue_new (grub_size_t elsize,
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/* Heap property: pq->cmp (element (pq, p), element (pq, parent (p))) <= 0. */
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grub_err_t
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grub_priority_queue_push (grub_priority_queue_t pq, void *el)
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grub_priority_queue_push (grub_priority_queue_t pq, const void *el)
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{
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grub_size_t p;
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if (pq->used == pq->allocated)
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@ -25,6 +25,8 @@
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#include <grub/mm.h>
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#include <grub/dl.h>
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#include <grub/file.h>
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#include <grub/priority_queue.h>
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#include <grub/term.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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@ -103,8 +105,49 @@ typedef struct tftp_data
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grub_uint32_t block_size;
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int have_oack;
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grub_net_udp_socket_t sock;
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grub_priority_queue_t pq;
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} *tftp_data_t;
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static int
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cmp (const void *a__, const void *b__)
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{
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struct grub_net_buff *a_ = *(struct grub_net_buff **) a__;
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struct grub_net_buff *b_ = *(struct grub_net_buff **) b__;
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struct tftphdr *a = (struct tftphdr *) a_->data;
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struct tftphdr *b = (struct tftphdr *) b_->data;
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/* We want the first elements to be on top. */
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if (grub_be_to_cpu16 (a->u.data.block) < grub_be_to_cpu16 (b->u.data.block))
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return +1;
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if (grub_be_to_cpu16 (a->u.data.block) > grub_be_to_cpu16 (b->u.data.block))
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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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ack (grub_net_udp_socket_t sock, grub_uint16_t block)
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{
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struct tftphdr *tftph_ack;
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grub_uint8_t nbdata[512];
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struct grub_net_buff nb_ack;
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grub_err_t err;
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nb_ack.head = nbdata;
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nb_ack.end = nbdata + sizeof (nbdata);
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grub_netbuff_clear (&nb_ack);
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grub_netbuff_reserve (&nb_ack, 512);
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err = grub_netbuff_push (&nb_ack, sizeof (tftph_ack->opcode)
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+ sizeof (tftph_ack->u.ack.block));
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if (err)
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return err;
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tftph_ack = (struct tftphdr *) nb_ack.data;
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tftph_ack->opcode = grub_cpu_to_be16 (TFTP_ACK);
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tftph_ack->u.ack.block = block;
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err = grub_net_send_udp_packet (sock, &nb_ack);
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return err;
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}
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static grub_err_t
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tftp_receive (grub_net_udp_socket_t sock __attribute__ ((unused)),
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struct grub_net_buff *nb,
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@ -112,14 +155,12 @@ tftp_receive (grub_net_udp_socket_t sock __attribute__ ((unused)),
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{
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grub_file_t file = f;
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struct tftphdr *tftph = (void *) nb->data;
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grub_uint8_t nbdata[512];
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tftp_data_t data = file->data;
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grub_err_t err;
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grub_uint8_t *ptr;
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struct grub_net_buff nb_ack;
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nb_ack.head = nbdata;
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nb_ack.end = nbdata + sizeof (nbdata);
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if (nb->tail - nb->data < (grub_ssize_t) sizeof (tftph->opcode))
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "TFTP packet too small");
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tftph = (struct tftphdr *) nb->data;
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switch (grub_be_to_cpu16 (tftph->opcode))
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@ -141,61 +182,89 @@ tftp_receive (grub_net_udp_socket_t sock __attribute__ ((unused)),
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}
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data->block = 0;
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grub_netbuff_free (nb);
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break;
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case TFTP_DATA:
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err = grub_netbuff_pull (nb, sizeof (tftph->opcode) +
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sizeof (tftph->u.data.block));
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err = ack (data->sock, 0);
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if (err)
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return err;
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if (grub_be_to_cpu16 (tftph->u.data.block) == data->block + 1)
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{
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unsigned size = nb->tail - nb->data;
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data->block++;
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if (size < data->block_size)
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{
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file->device->net->eof = 1;
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}
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/* Prevent garbage in broken cards. */
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if (size > data->block_size)
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{
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err = grub_netbuff_unput (nb, size - data->block_size);
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if (err)
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return err;
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}
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/* If there is data, puts packet in socket list. */
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if ((nb->tail - nb->data) > 0)
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grub_net_put_packet (&file->device->net->packs, nb);
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else
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grub_netbuff_free (nb);
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}
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else
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{
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grub_netbuff_free (nb);
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return GRUB_ERR_NONE;
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}
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break;
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return GRUB_ERR_NONE;
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case TFTP_DATA:
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if (nb->tail - nb->data < (grub_ssize_t) (sizeof (tftph->opcode)
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+ sizeof (tftph->u.data.block)))
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "TFTP packet too small");
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err = ack (data->sock, tftph->u.data.block);
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if (err)
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return err;
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err = grub_priority_queue_push (data->pq, &nb);
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if (err)
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return err;
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{
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struct grub_net_buff **nb_top_p, *nb_top;
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while (1)
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{
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nb_top_p = grub_priority_queue_top (data->pq);
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if (!nb_top_p)
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return GRUB_ERR_NONE;
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nb_top = *nb_top_p;
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tftph = (struct tftphdr *) nb_top->data;
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grub_refresh ();
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if (grub_be_to_cpu16 (tftph->u.data.block) >= data->block + 1)
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break;
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grub_priority_queue_pop (data->pq);
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}
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if (grub_be_to_cpu16 (tftph->u.data.block) == data->block + 1)
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{
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unsigned size;
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grub_priority_queue_pop (data->pq);
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err = grub_netbuff_pull (nb_top, sizeof (tftph->opcode) +
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sizeof (tftph->u.data.block));
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if (err)
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return err;
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size = nb_top->tail - nb_top->data;
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data->block++;
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if (size < data->block_size)
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{
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file->device->net->eof = 1;
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grub_net_udp_close (data->sock);
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data->sock = NULL;
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}
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/* Prevent garbage in broken cards. Is it still necessary
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given that IP implementation has been fixed?
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*/
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if (size > data->block_size)
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{
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err = grub_netbuff_unput (nb_top, size - data->block_size);
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if (err)
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return err;
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}
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/* If there is data, puts packet in socket list. */
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if ((nb_top->tail - nb_top->data) > 0)
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grub_net_put_packet (&file->device->net->packs, nb_top);
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else
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grub_netbuff_free (nb);
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}
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}
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return GRUB_ERR_NONE;
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case TFTP_ERROR:
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grub_netbuff_free (nb);
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return grub_error (GRUB_ERR_IO, (char *) tftph->u.err.errmsg);
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default:
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grub_netbuff_free (nb);
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return GRUB_ERR_NONE;
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}
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grub_netbuff_clear (&nb_ack);
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grub_netbuff_reserve (&nb_ack, 512);
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err = grub_netbuff_push (&nb_ack, sizeof (tftph->opcode)
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+ sizeof (tftph->u.ack.block));
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if (err)
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return err;
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}
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tftph = (struct tftphdr *) nb_ack.data;
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tftph->opcode = grub_cpu_to_be16 (TFTP_ACK);
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tftph->u.ack.block = grub_cpu_to_be16 (data->block);
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static void
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destroy_pq (tftp_data_t data)
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{
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struct grub_net_buff **nb_p;
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while ((nb_p = grub_priority_queue_top (data->pq)))
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grub_netbuff_free (*nb_p);
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err = grub_net_send_udp_packet (data->sock, &nb_ack);
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if (file->device->net->eof)
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{
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grub_net_udp_close (data->sock);
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data->sock = NULL;
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}
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return err;
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grub_priority_queue_destroy (data->pq);
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}
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static grub_err_t
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@ -261,16 +330,25 @@ tftp_open (struct grub_file *file, const char *filename)
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file->not_easily_seekable = 1;
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file->data = data;
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data->pq = grub_priority_queue_new (sizeof (struct grub_net_buff *), cmp);
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if (!data->pq)
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return grub_errno;
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data->sock = grub_net_udp_open (file->device->net->server,
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TFTP_SERVER_PORT, tftp_receive,
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file);
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if (!data->sock)
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return grub_errno;
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{
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destroy_pq (data);
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return grub_errno;
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}
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err = grub_net_send_udp_packet (data->sock, &nb);
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if (err)
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{
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grub_net_udp_close (data->sock);
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destroy_pq (data);
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return err;
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}
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@ -278,8 +356,6 @@ tftp_open (struct grub_file *file, const char *filename)
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for (i = 0; i < 3; i++)
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{
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grub_net_poll_cards (100);
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if (grub_errno)
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return grub_errno;
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if (data->have_oack)
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break;
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/* Retry. */
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@ -287,6 +363,7 @@ tftp_open (struct grub_file *file, const char *filename)
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if (err)
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{
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grub_net_udp_close (data->sock);
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destroy_pq (data);
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return err;
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}
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}
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@ -294,6 +371,7 @@ tftp_open (struct grub_file *file, const char *filename)
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if (!data->have_oack)
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{
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grub_net_udp_close (data->sock);
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destroy_pq (data);
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return grub_error (GRUB_ERR_TIMEOUT, "Time out opening tftp.");
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}
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file->size = data->file_size;
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@ -334,6 +412,7 @@ tftp_close (struct grub_file *file)
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grub_print_error ();
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grub_net_udp_close (data->sock);
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}
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destroy_pq (data);
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grub_free (data);
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return GRUB_ERR_NONE;
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}
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@ -31,6 +31,6 @@ grub_priority_queue_t grub_priority_queue_new (grub_size_t elsize,
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void grub_priority_queue_destroy (grub_priority_queue_t pq);
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void *grub_priority_queue_top (grub_priority_queue_t pq);
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void grub_priority_queue_pop (grub_priority_queue_t pq);
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grub_err_t grub_priority_queue_push (grub_priority_queue_t pq, void *el);
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grub_err_t grub_priority_queue_push (grub_priority_queue_t pq, const void *el);
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#endif
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