contiki/apps/shell/shell-download.c

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/*
* Copyright (c) 2009, 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.
*
*/
/**
* \file Shell command for downloading files from a remote node.
* Example usage:
* 'download <node addr> <filename> | write <local_filename'.
*
* \author Luca Mottola <luca@sics.se>, Fredrik Osterlind <fros@sics.se>
*/
#include "contiki.h"
#include "shell.h"
#include "net/rime.h"
#include "cfs/cfs.h"
#include "dev/leds.h"
#include <stdio.h>
#include <string.h>
#define RUNICAST_CHANNEL SHELL_RIME_CHANNEL_DOWNLOAD
#define RUCB_CHANNEL (SHELL_RIME_CHANNEL_DOWNLOAD+1)
#define MAX_RETRANSMISSIONS 8
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
PROCESS(shell_download_process, "download");
PROCESS(shell_download_server_process, "download server");
SHELL_COMMAND(download_command,
"download",
"download <node addr> <filename>: download file from remote node",
&shell_download_process);
/*---------------------------------------------------------------------------*/
static struct runicast_conn runicast;
static struct rucb_conn rucb;
static uint8_t downloading;
static uint8_t req_seq_counter;
static uint8_t req_last_seq;
static int fd;
/*---------------------------------------------------------------------------*/
static void
write_chunk(struct rucb_conn *c, int offset, int flag, char *data, int datalen)
{
if(datalen > 0) {
shell_output(&download_command,
data, datalen, NULL, 0);
PRINTF("write_chunk %d at %d bytes\n", datalen, offset);
}
if(flag == RUCB_FLAG_NEWFILE) {
PRINTF("RUCB_FLAG_NEWFILE\n");
} else if(flag == RUCB_FLAG_NONE) {
PRINTF("RUCB_FLAG_NONE\n");
}
if(flag == RUCB_FLAG_LASTCHUNK) {
PRINTF("RUCB_FLAG_LASTCHUNK\n");
downloading = 0;
process_poll(&shell_download_process);
}
}
/*---------------------------------------------------------------------------*/
static int
read_chunk(struct rucb_conn *c, int offset, char *to, int maxsize)
{
int ret;
if(fd < 0) {
/* No file, send EOF */
leds_off(LEDS_GREEN);
return 0;
}
cfs_seek(fd, offset, CFS_SEEK_SET);
ret = cfs_read(fd, to, maxsize);
PRINTF("read_chunk %d bytes at %d\n", ret, offset);
if(ret < maxsize) {
PRINTF("read_chunk DONE\n");
cfs_close(fd);
fd = -1;
}
return ret;
}
/*---------------------------------------------------------------------------*/
static void
timedout(struct rucb_conn *c)
{
}
/*---------------------------------------------------------------------------*/
static const struct rucb_callbacks rucb_call = { write_chunk, read_chunk, timedout };
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(shell_download_process, ev, data)
{
const char *nextptr;
static rimeaddr_t addr;
int len;
char buf[32];
PROCESS_BEGIN();
/* Parse node addr */
addr.u8[0] = shell_strtolong(data, &nextptr);
if(nextptr == data || *nextptr != '.') {
shell_output_str(&download_command,
"download <node addr> <filename>: need node address", "");
PROCESS_EXIT();
}
++nextptr;
addr.u8[1] = shell_strtolong(nextptr, &nextptr);
/* Get the length of the file, excluding a terminating NUL character. */
while(nextptr[0] == ' ') {
nextptr++;
}
len = strlen(nextptr);
/*snprintf(buf, sizeof(buf), "%d.%d", addr.u8[0], addr.u8[1]);*/
/*shell_output_str(&download_command, "Downloading from: ", buf);*/
if(len > PACKETBUF_SIZE - 32) {
snprintf(buf, sizeof(buf), "%d", len);
shell_output_str(&download_command, "filename too large: ", buf);
PROCESS_EXIT();
}
/*shell_output_str(&download_command, "Downloading file: ", nextptr);*/
/* Send file request */
downloading = 1;
rucb_open(&rucb, RUCB_CHANNEL, &rucb_call);
packetbuf_clear();
*((uint8_t *)packetbuf_dataptr()) = ++req_seq_counter;
memcpy(((char *)packetbuf_dataptr()) + 1, nextptr, len + 1);
packetbuf_set_datalen(len + 2);
PRINTF("requesting '%s'\n", nextptr);
runicast_send(&runicast, &addr, MAX_RETRANSMISSIONS);
/* Wait for download to finish */
leds_on(LEDS_BLUE);
PROCESS_WAIT_UNTIL(!runicast_is_transmitting(&runicast) && !downloading);
leds_off(LEDS_BLUE);
rucb_close(&rucb);
/*shell_output_str(&download_command, "Done!", "");*/
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
static void
request_recv(struct runicast_conn *c, const rimeaddr_t *from, uint8_t seqno)
{
const char *filename;
uint8_t seq;
if(packetbuf_datalen() < 2) {
/* Bad filename, ignore request */
printf("download: bad filename request (null)\n");
return;
}
seq = ((uint8_t *)packetbuf_dataptr())[0];
if(seq == req_last_seq) {
PRINTF("download: ignoring duplicate request\n");
return;
}
req_last_seq = seq;
filename = ((char *)packetbuf_dataptr()) + 1;
PRINTF("file requested: '%s'\n", filename);
/* Initiate file transfer */
leds_on(LEDS_GREEN);
if(fd >= 0) {
cfs_close(fd);
}
fd = cfs_open(filename, CFS_READ);
if(fd < 0) {
printf("download: bad filename request (no read access): %s\n", filename);
} else {
PRINTF("download: sending file: %s\n", filename);
}
rucb_close(&rucb);
rucb_open(&rucb, RUCB_CHANNEL, &rucb_call);
rucb_send(&rucb, from);
}
/*---------------------------------------------------------------------------*/
static void
request_sent(struct runicast_conn *c, const rimeaddr_t *to,
uint8_t retransmissions)
{
process_poll(&shell_download_process);
}
/*---------------------------------------------------------------------------*/
static void
request_timedout(struct runicast_conn *c, const rimeaddr_t *to,
uint8_t retransmissions)
{
shell_output_str(&download_command, "download: request timed out", "");
downloading = 0;
process_poll(&shell_download_process);
}
/*---------------------------------------------------------------------------*/
static const struct runicast_callbacks runicast_callbacks =
{request_recv, request_sent, request_timedout};
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(shell_download_server_process, ev, data)
{
PROCESS_EXITHANDLER( runicast_close(&runicast); rucb_close(&rucb); );
PROCESS_BEGIN();
runicast_open(&runicast, RUNICAST_CHANNEL, &runicast_callbacks);
PROCESS_WAIT_UNTIL(0);
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
void
shell_download_init(void)
{
req_seq_counter = 0;
req_last_seq = -1;
fd = -1;
downloading = 0;
shell_register_command(&download_command);
process_start(&shell_download_server_process, NULL);
}
/*---------------------------------------------------------------------------*/