contiki/apps/shell/shell-rime-sendcmd.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.
*
*/
#include "contiki.h"
#include "contiki-conf.h"
#include "shell-rime.h"
#include "dev/leds.h"
#include "lib/crc16.h"
#include "lib/random.h"
#include "net/rime.h"
#include "net/rime/unicast.h"
#include "net/rime/timesynch.h"
#if CONTIKI_TARGET_NETSIM
#include "ether.h"
#endif /* CONTIKI_TARGET_NETSIM */
#include <stdio.h>
#ifndef HAVE_SNPRINTF
int snprintf(char *str, size_t size, const char *format, ...);
#endif /* HAVE_SNPRINTF */
#include <string.h>
#define CMDMSG_HDR_SIZE 2
struct cmd_msg {
uint16_t crc;
char sendcmd[1];
};
static struct unicast_conn uc;
/*---------------------------------------------------------------------------*/
PROCESS(shell_sendcmd_process, "sendcmd");
PROCESS(shell_sendcmd_server_process, "sendcmd server");
SHELL_COMMAND(sendcmd_command,
"sendcmd",
"sendcmd <node addr> <command>: send a command to the specified one-hop node",
&shell_sendcmd_process);
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(shell_sendcmd_server_process, ev, data)
{
static struct process *child_command;
int err;
PROCESS_BEGIN();
/* XXX: direct output to null. */
/* printf("sendcmd server got command string '%s'\n", (char *)data);*/
err = shell_start_command(data, strlen((char * )data), NULL, &child_command);
if(err == SHELL_FOREGROUND && process_is_running(child_command)) {
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_EXIT ||
(ev == PROCESS_EVENT_EXITED &&
data == child_command));
if(ev == PROCESS_EVENT_EXIT) {
process_exit(child_command);
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(shell_sendcmd_process, ev, data)
{
struct cmd_msg *msg;
int len;
rimeaddr_t addr;
const char *nextptr;
char buf[32];
PROCESS_BEGIN();
addr.u8[0] = shell_strtolong(data, &nextptr);
if(nextptr == data || *nextptr != '.') {
shell_output_str(&sendcmd_command,
"sendcmd <node addr>: receiver must be specified", "");
PROCESS_EXIT();
}
++nextptr;
addr.u8[1] = shell_strtolong(nextptr, &nextptr);
snprintf(buf, sizeof(buf), "%d.%d", addr.u8[0], addr.u8[1]);
shell_output_str(&sendcmd_command, "Sending command to ", buf);
/* Get the length of the command line, excluding a terminating NUL character. */
len = strlen((char *)nextptr);
/* Check the length of the command line to see that it is small
enough to fit in a packet. We count with 32 bytes of header,
which may be a little too much, but at least we are on the safe
side. */
if(len > PACKETBUF_SIZE - 32) {
snprintf(buf, sizeof(buf), "%d", len);
shell_output_str(&sendcmd_command, "command line too large: ", buf);
PROCESS_EXIT();
}
packetbuf_clear();
msg = packetbuf_dataptr();
packetbuf_set_datalen(len + 1 + CMDMSG_HDR_SIZE);
strcpy(msg->sendcmd, nextptr);
/* Terminate the string with a NUL character. */
msg->sendcmd[len] = 0;
msg->crc = crc16_data(msg->sendcmd, len, 0);
/* printf("sendcmd sending '%s'\n", msg->sendcmd);*/
unicast_send(&uc, &addr);
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
static void
recv_uc(struct unicast_conn *c, const rimeaddr_t *from)
{
struct cmd_msg *msg;
uint16_t crc;
int len;
msg = packetbuf_dataptr();
if(packetbuf_datalen() > 1 + CMDMSG_HDR_SIZE) {
/* First ensure that the old process is killed. */
process_exit(&shell_sendcmd_server_process);
len = packetbuf_datalen() - 1 - CMDMSG_HDR_SIZE;
/* Make sure that the incoming command is null-terminated. */
msg->sendcmd[len] = 0;
memcpy(&crc, &msg->crc, sizeof(crc));
if(crc == crc16_data(msg->sendcmd, len, 0)) {
/* Start the server process with the incoming command. */
process_start(&shell_sendcmd_server_process, msg->sendcmd);
}
}
}
static const struct unicast_callbacks unicast_callbacks = { recv_uc };
/*---------------------------------------------------------------------------*/
void
shell_rime_sendcmd_init(void)
{
unicast_open(&uc, SHELL_RIME_CHANNEL_SENDCMD, &unicast_callbacks);
shell_register_command(&sendcmd_command);
}
/*---------------------------------------------------------------------------*/