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* Copyright (c) 2011, 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
* Code for the simple-udp module.
* \author
* Adam Dunkels <adam@sics.se>
*
*/
/**
* \addtogroup simple-udp
* @{
*/
#include <net/ip_buf.h>
#include "contiki-net.h"
#include "contiki/ip/simple-udp.h"
#include <string.h>
#ifdef CONFIG_NETWORK_IP_STACK_DEBUG_SIMPLE_UDP
#define DEBUG 1
#endif
#include "contiki/ip/uip-debug.h"
#if UIP_LOGGING
#include <stdio.h>
void uip_log(char *msg);
#define UIP_LOG(m) uip_log(m)
#else
#define UIP_LOG(m)
#endif
PROCESS(simple_udp_process, "Simple UDP process");
static uint8_t started = 0;
#if 0
/* Moved to net_buf */
static uint8_t databuffer[UIP_BUFSIZE];
#endif
#define UIP_IP_BUF(buf) ((struct uip_udpip_hdr *)&uip_buf(buf)[UIP_LLH_LEN])
/*---------------------------------------------------------------------------*/
static void
init_simple_udp(void)
{
if(started == 0) {
process_start(&simple_udp_process, NULL, NULL);
started = 1;
}
}
/*---------------------------------------------------------------------------*/
int
simple_udp_send(struct net_buf *buf, struct simple_udp_connection *c,
const void *data, uint16_t datalen)
{
if(c->udp_conn != NULL) {
return uip_udp_packet_sendto(buf, c->udp_conn, data, datalen,
&c->remote_addr, UIP_HTONS(c->remote_port));
}
return 0;
}
/*---------------------------------------------------------------------------*/
int
simple_udp_sendto(struct net_buf *buf, struct simple_udp_connection *c,
const void *data, uint16_t datalen,
const uip_ipaddr_t *to)
{
if(c->udp_conn != NULL) {
return uip_udp_packet_sendto(buf, c->udp_conn, data, datalen,
to, UIP_HTONS(c->remote_port));
}
return 0;
}
/*---------------------------------------------------------------------------*/
int
simple_udp_sendto_port(struct net_buf *buf, struct simple_udp_connection *c,
const void *data, uint16_t datalen,
const uip_ipaddr_t *to,
uint16_t port)
{
if(c->udp_conn != NULL) {
return uip_udp_packet_sendto(buf, c->udp_conn, data, datalen,
to, UIP_HTONS(port));
}
return 0;
}
/*---------------------------------------------------------------------------*/
int
simple_udp_register(struct simple_udp_connection *c,
uint16_t local_port,
uip_ipaddr_t *remote_addr,
uint16_t remote_port,
simple_udp_callback receive_callback,
void *user_data)
{
init_simple_udp();
c->local_port = local_port;
c->remote_port = remote_port;
if(remote_addr != NULL) {
uip_ipaddr_copy(&c->remote_addr, remote_addr);
}
c->receive_callback = receive_callback;
c->user_data = user_data;
PROCESS_CONTEXT_BEGIN(&simple_udp_process);
c->udp_conn = udp_new(remote_addr, UIP_HTONS(remote_port), c);
if(c->udp_conn != NULL) {
udp_bind(c->udp_conn, UIP_HTONS(local_port));
}
PROCESS_CONTEXT_END();
if(c->udp_conn == NULL) {
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
int
simple_udp_unregister(struct simple_udp_connection *c)
{
if (c) {
c->local_port = 0;
if (c->udp_conn) {
udp_unbind(c->udp_conn);
}
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(simple_udp_process, ev, data, buf, user_data)
{
struct simple_udp_connection *c;
PROCESS_BEGIN();
while(1) {
PROCESS_WAIT_EVENT();
if(ev == tcpip_event) {
/* An appstate pointer is passed to use from the IP stack
through the 'data' pointer. We registered this appstate when
we did the udp_new() call in simple_udp_register() as the
struct simple_udp_connection pointer. So we extract this
pointer and use it when calling the reception callback. */
c = (struct simple_udp_connection *)data;
/* Defensive coding: although the appstate *should* be non-null
here, we make sure to avoid the program crashing on us. */
if(c != NULL) {
/* If we were called because of incoming data, we should call
the reception callback. */
if(uip_newdata(buf)) {
#if 0
/* Copy the data from the uIP data buffer into our own
buffer to avoid the uIP buffer being messed with by the
callee. */
memcpy(databuffer, uip_appdata, uip_datalen());
#endif
/* Call the client process. We use the PROCESS_CONTEXT
mechanism to temporarily switch process context to the
client process. */
if(c->receive_callback != NULL) {
PROCESS_CONTEXT_BEGIN(c->client_process);
PRINTF("simple_udp_process(%p): calling cb %p "
"appdata %p datalen %d\n", buf,
c->receive_callback, uip_appdata(buf),
uip_datalen(buf));
c->receive_callback(c,
&(UIP_IP_BUF(buf)->srcipaddr),
UIP_HTONS(UIP_IP_BUF(buf)->srcport),
&(UIP_IP_BUF(buf)->destipaddr),
UIP_HTONS(UIP_IP_BUF(buf)->destport),
uip_appdata(buf), uip_datalen(buf),
c->user_data, buf);
PROCESS_CONTEXT_END();
}
}
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/** @} */
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