236 lines
7.2 KiB
C
236 lines
7.2 KiB
C
/*
|
|
* Copyright (c) 2007, Swedish Institute of Computer Science.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
* $Id: rudolph0.c,v 1.2 2007/03/21 23:18:23 adamdunkels Exp $
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Rudolph0: a simple block data flooding protocol
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
#include "net/rime.h"
|
|
#include "rudolph0.h"
|
|
#include "cfs/cfs.h"
|
|
|
|
#include <stddef.h> /* for offsetof */
|
|
|
|
#define SENDING_TIME CLOCK_SECOND / 2
|
|
#define STEADY_TIME CLOCK_SECOND * 2
|
|
|
|
enum {
|
|
TYPE_DATA,
|
|
TYPE_NACK,
|
|
};
|
|
|
|
enum {
|
|
STATE_RECEIVER,
|
|
STATE_SENDER,
|
|
};
|
|
|
|
#define VERSION_LT(a, b) ((signed char)((a) - (b)) < 0)
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#else
|
|
#define PRINTF(...)
|
|
#endif
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
read_new_datapacket(struct rudolph0_conn *c)
|
|
{
|
|
int len;
|
|
|
|
len = cfs_read(c->cfs_fd, c->current.data, RUDOLPH0_DATASIZE);
|
|
c->current.datalen = len;
|
|
|
|
PRINTF("read_new_datapacket len %d\n", len);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
send_nack(struct rudolph0_conn *c)
|
|
{
|
|
struct rudolph0_hdr *hdr;
|
|
rimebuf_clear();
|
|
rimebuf_hdrextend(sizeof(struct rudolph0_hdr));
|
|
hdr = rimebuf_hdrptr();
|
|
|
|
hdr->type = TYPE_NACK;
|
|
hdr->version = c->current.h.version;
|
|
hdr->chunk = c->current.h.chunk;
|
|
|
|
PRINTF("Sending nack for %d:%d\n", hdr->version, hdr->chunk);
|
|
uabc_send(&c->nackc, CLOCK_SECOND / 4);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
sent(struct sabc_conn *sabc)
|
|
{
|
|
struct rudolph0_conn *c = (struct rudolph0_conn *)sabc;
|
|
|
|
if(c->current.datalen == RUDOLPH0_DATASIZE) {
|
|
c->current.h.chunk++;
|
|
PRINTF("Sending data chunk %d next time\n", c->current.h.chunk);
|
|
read_new_datapacket(c);
|
|
} else {
|
|
sabc_set_timer(&c->c, STEADY_TIME);
|
|
PRINTF("Steady: Sending the same data chunk next time datalen %d, %d\n",
|
|
c->current.datalen, RUDOLPH0_DATASIZE);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
recv(struct sabc_conn *sabc)
|
|
{
|
|
struct rudolph0_conn *c = (struct rudolph0_conn *)sabc;
|
|
struct rudolph0_datapacket *p = rimebuf_dataptr();
|
|
|
|
/* if(rand() & 1) {
|
|
return;
|
|
}*/
|
|
|
|
if(p->h.type == TYPE_DATA) {
|
|
if(c->current.h.version != p->h.version) {
|
|
PRINTF("rudolph0 new version %d\n", p->h.version);
|
|
if(c->cfs_fd != -1) {
|
|
cfs_close(c->cfs_fd);
|
|
}
|
|
c->cfs_fd = c->cb->new_file(c);
|
|
c->current.h.version = p->h.version;
|
|
c->current.h.chunk = 0;
|
|
if(c->cfs_fd != -1) {
|
|
if(p->h.chunk != 0) {
|
|
send_nack(c);
|
|
} else {
|
|
cfs_write(c->cfs_fd, p->data, p->datalen);
|
|
c->current.h.chunk++;
|
|
}
|
|
}
|
|
} else if(p->h.version == c->current.h.version) {
|
|
if(c->cfs_fd != -1) {
|
|
if(p->h.chunk == c->current.h.chunk) {
|
|
PRINTF("received chunk %d\n", p->h.chunk);
|
|
cfs_write(c->cfs_fd, p->data, p->datalen);
|
|
c->current.h.chunk++;
|
|
if(p->datalen < RUDOLPH0_DATASIZE) {
|
|
cfs_close(c->cfs_fd);
|
|
c->cfs_fd = -1;
|
|
c->cb->received_file(c);
|
|
}
|
|
|
|
} else if(p->h.chunk > c->current.h.chunk) {
|
|
PRINTF("received chunk %d > %d, sending NACK\n", p->h.chunk, c->current.h.chunk);
|
|
send_nack(c);
|
|
}
|
|
}
|
|
} else { /* p->h.version < c->current.h.version */
|
|
/* Ignore packets with old version */
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
recv_nack(struct uabc_conn *uabc)
|
|
{
|
|
struct rudolph0_conn *c = (struct rudolph0_conn *)
|
|
((char *)uabc - offsetof(struct rudolph0_conn,
|
|
nackc));
|
|
struct rudolph0_datapacket *p = rimebuf_dataptr();
|
|
|
|
if(p->h.type == TYPE_NACK && c->state == STATE_SENDER) {
|
|
if(p->h.version == c->current.h.version) {
|
|
PRINTF("Reseting chunk to %d\n", p->h.chunk);
|
|
c->current.h.chunk = p->h.chunk;
|
|
cfs_seek(c->cfs_fd, c->current.h.chunk * RUDOLPH0_DATASIZE);
|
|
} else {
|
|
PRINTF("Wrong version, reseting chunk to 0\n");
|
|
c->current.h.chunk = 0;
|
|
cfs_seek(c->cfs_fd, 0);
|
|
}
|
|
read_new_datapacket(c);
|
|
sabc_set_timer(&c->c, SENDING_TIME);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static const struct uabc_callbacks uabc = { recv_nack, NULL, NULL };
|
|
static const struct sabc_callbacks sabc = { recv, sent };
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rudolph0_open(struct rudolph0_conn *c, u16_t channel,
|
|
const struct rudolph0_callbacks *cb)
|
|
{
|
|
sabc_open(&c->c, channel, &sabc);
|
|
uabc_open(&c->nackc, channel + 1, &uabc);
|
|
c->cb = cb;
|
|
c->current.h.version = 0;
|
|
c->state = STATE_RECEIVER;
|
|
c->cfs_fd = -1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rudolph0_close(struct rudolph0_conn *c)
|
|
{
|
|
sabc_close(&c->c);
|
|
uabc_close(&c->nackc);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rudolph0_send(struct rudolph0_conn *c, int cfs_fd)
|
|
{
|
|
if(c->cfs_fd != -1) {
|
|
cfs_close(c->cfs_fd);
|
|
}
|
|
c->state = STATE_SENDER;
|
|
c->cfs_fd = cfs_fd;
|
|
c->current.h.version++;
|
|
c->current.h.chunk = 0;
|
|
c->current.h.type = TYPE_DATA;
|
|
read_new_datapacket(c);
|
|
rimebuf_reference(&c->current, sizeof(struct rudolph0_datapacket));
|
|
sabc_send_stubborn(&c->c, SENDING_TIME);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
rudolph0_version(struct rudolph0_conn *c)
|
|
{
|
|
return c->current.h.version;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rudolph0_set_version(struct rudolph0_conn *c, int version)
|
|
{
|
|
c->current.h.version = version;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|