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osd-contiki/examples/osd/sensniff/sensniff.c

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/*
* Copyright (c) 2016, George Oikonomou - http://www.spd.gr
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "sensniff.h"
#include "dev/radio.h"
#include "net/netstack.h"
#include "net/packetbuf.h"
#include "sys/process.h"
#include "sys/ctimer.h"
#include "lib/ringbuf.h"
#include SENSNIFF_IO_DRIVER_H
#include <string.h>
#include <stdint.h>
#include <stdio.h>
/*---------------------------------------------------------------------------*/
#define DEBUG 1
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
PROCESS(sensniff_process, "sensniff process");
AUTOSTART_PROCESSES(&sensniff_process);
/*---------------------------------------------------------------------------*/
/* Timeout handling for incoming characters. */
#define TIMEOUT (CLOCK_SECOND >> 1)
static struct ctimer ct;
/*---------------------------------------------------------------------------*/
#define STATE_WAITING_FOR_MAGIC 0x00
#define STATE_WAITING_FOR_VERSION 0x01
#define STATE_WAITING_FOR_CMD 0x02
#define STATE_WAITING_FOR_LEN_1 0x03
#define STATE_WAITING_FOR_LEN_2 0x04
#define STATE_WAITING_FOR_DATA 0x05
static uint8_t state;
static uint8_t in_ct;
/*---------------------------------------------------------------------------*/
#define CMD_FRAME 0x00
#define CMD_CHANNEL 0x01
#define CMD_CHANNEL_MIN 0x02
#define CMD_CHANNEL_MAX 0x03
#define CMD_ERR_NOT_SUPPORTED 0x7F
#define CMD_GET_CHANNEL 0x81
#define CMD_GET_CHANNEL_MIN 0x82
#define CMD_GET_CHANNEL_MAX 0x83
#define CMD_SET_CHANNEL 0x84
/*---------------------------------------------------------------------------*/
#define PROTOCOL_VERSION 2
/*---------------------------------------------------------------------------*/
#define BUFSIZE 32
static struct ringbuf rxbuf;
typedef struct cmd_in_s {
uint8_t cmd;
uint16_t len;
uint8_t data;
} cmd_in_t;
static cmd_in_t command;
uint8_t cmd_buf[BUFSIZE];
/*---------------------------------------------------------------------------*/
static const uint8_t magic[] = { 0xC1, 0x1F, 0xFE, 0x72 };
/*---------------------------------------------------------------------------*/
static void
reset_state(void *byte)
{
state = STATE_WAITING_FOR_MAGIC;
in_ct = 0;
memset(&command, 0, sizeof(command));
}
/*---------------------------------------------------------------------------*/
static void
send_header(uint8_t cmd, uint16_t len)
{
uint16_t i;
/* Send the magic */
for(i = 0; i < 4; i++) {
sensniff_io_byte_out(magic[i]);
}
/* Send the protocol version */
sensniff_io_byte_out(PROTOCOL_VERSION);
/* Send the command byte */
sensniff_io_byte_out(cmd);
/* Send the length, network endianness */
sensniff_io_byte_out(len >> 8);
sensniff_io_byte_out(len & 0xFF);
}
/*---------------------------------------------------------------------------*/
static void
send_error(void)
{
send_header(CMD_ERR_NOT_SUPPORTED, 0);
sensniff_io_flush();
}
/*---------------------------------------------------------------------------*/
static void
send_channel(void)
{
radio_value_t chan;
if(NETSTACK_RADIO.get_value(RADIO_PARAM_CHANNEL, &chan) ==
RADIO_RESULT_OK) {
send_header(CMD_CHANNEL, 1);
sensniff_io_byte_out(chan & 0xFF);
sensniff_io_flush();
return;
}
send_error();
}
/*---------------------------------------------------------------------------*/
static void
set_channel(uint8_t channel)
{
if(NETSTACK_RADIO.set_value(RADIO_PARAM_CHANNEL, channel) ==
RADIO_RESULT_OK) {
send_channel();
return;
}
send_error();
}
/*---------------------------------------------------------------------------*/
static void
send_channel_min(void)
{
radio_value_t chan;
if(NETSTACK_RADIO.get_value(RADIO_CONST_CHANNEL_MIN, &chan) ==
RADIO_RESULT_OK) {
send_header(CMD_CHANNEL_MIN, 1);
sensniff_io_byte_out(chan & 0xFF);
sensniff_io_flush();
return;
}
send_error();
}
/*---------------------------------------------------------------------------*/
static void
send_channel_max(void)
{
radio_value_t chan;
if(NETSTACK_RADIO.get_value(RADIO_CONST_CHANNEL_MAX, &chan) ==
RADIO_RESULT_OK) {
send_header(CMD_CHANNEL_MAX, 1);
sensniff_io_byte_out(chan & 0xFF);
sensniff_io_flush();
return;
}
send_error();
}
/*---------------------------------------------------------------------------*/
static int
char_in(unsigned char c)
{
/* Bump the timeout counter */
ctimer_set(&ct, TIMEOUT, reset_state, NULL);
/* Add the character to our ringbuf and poll the consumer process. */
ringbuf_put(&rxbuf, c);
process_poll(&sensniff_process);
return 1;
}
/*---------------------------------------------------------------------------*/
void
sensniff_output_frame()
{
int i;
uint8_t len = packetbuf_datalen() & 0xFF;
send_header(CMD_FRAME, len + 2);
for(i = 0; i < len; i++) {
sensniff_io_byte_out(((uint8_t *)packetbuf_dataptr())[i]);
}
sensniff_io_byte_out(packetbuf_attr(PACKETBUF_ATTR_RSSI) & 0xFF);
sensniff_io_byte_out(0x80 |
(packetbuf_attr(PACKETBUF_ATTR_LINK_QUALITY) & 0xFF));
sensniff_io_flush();
}
/*---------------------------------------------------------------------------*/
static void
execute_command(void)
{
switch(command.cmd) {
case CMD_GET_CHANNEL:
send_channel();
break;
case CMD_GET_CHANNEL_MIN:
send_channel_min();
break;
case CMD_GET_CHANNEL_MAX:
send_channel_max();
break;
case CMD_SET_CHANNEL:
set_channel(command.data);
break;
default:
send_error();
break;
}
}
/*---------------------------------------------------------------------------*/
static void
process_incoming_data(void)
{
int c = 0;
uint8_t byte_in;
c = ringbuf_get(&rxbuf);
while(c != -1) {
byte_in = (uint8_t)c;
switch(state) {
case STATE_WAITING_FOR_MAGIC:
if(byte_in == magic[in_ct]) {
in_ct++;
if(in_ct == sizeof(magic)) {
state = STATE_WAITING_FOR_VERSION;
in_ct = 0;
}
} else {
reset_state(&byte_in);
}
break;
case STATE_WAITING_FOR_VERSION:
if(byte_in == PROTOCOL_VERSION) {
state = STATE_WAITING_FOR_CMD;
} else {
reset_state(&byte_in);
}
break;
case STATE_WAITING_FOR_CMD:
command.cmd = byte_in;
if(command.cmd == CMD_GET_CHANNEL ||
command.cmd == CMD_GET_CHANNEL_MIN ||
command.cmd == CMD_GET_CHANNEL_MAX) {
execute_command();
reset_state(&byte_in);
} else {
state = STATE_WAITING_FOR_LEN_1;
}
break;
case STATE_WAITING_FOR_LEN_1:
command.len = byte_in << 8;
state = STATE_WAITING_FOR_LEN_2;
break;
case STATE_WAITING_FOR_LEN_2:
command.len |= byte_in;
if(command.len == 1) {
state = STATE_WAITING_FOR_DATA;
} else {
reset_state(&byte_in);
}
break;
case STATE_WAITING_FOR_DATA:
command.data = byte_in;
execute_command();
reset_state(&byte_in);
break;
default:
break;
}
c = ringbuf_get(&rxbuf);
}
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(sensniff_process, ev, data)
{
PROCESS_BEGIN();
PRINTF("sensniff: setting RF in promiscuous mode\n");
/* Turn off RF frame filtering and H/W ACKs */
if(NETSTACK_RADIO.set_value(RADIO_PARAM_RX_MODE, 0) != RADIO_RESULT_OK) {
PRINTF("sensniff: Error setting RF in promiscuous mode\n");
PROCESS_EXIT();
}
/* Initialise the ring buffer */
PRINTF("Initialise the ring buffer\n");
ringbuf_init(&rxbuf, cmd_buf, sizeof(cmd_buf));
/* Initialise the state machine */
PRINTF("Initialise the state machine\n");
reset_state(NULL);
/* Register for char inputs with the character I/O peripheral */
PRINTF("Register for char inputs with the character I/O peripheral\n");
sensniff_io_set_input(&char_in);
PRINTF("loop\n");
while(1) {
PROCESS_YIELD();
PRINTF("POLL\n");
if(ev == PROCESS_EVENT_POLL) {
PRINTF("process_incoming_data\n");
process_incoming_data();
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
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