contiki/core/net/ip/udp-socket.c

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2014-03-24 07:42:13 +00:00
/*
* Copyright (c) 2012-2014, Thingsquare, http://www.thingsquare.com/.
* 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-net.h"
#include "udp-socket.h"
#include <string.h>
PROCESS(udp_socket_process, "UDP socket process");
static uint8_t buf[UIP_BUFSIZE];
#define UIP_IP_BUF ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])
/*---------------------------------------------------------------------------*/
static void
init(void)
{
static uint8_t inited = 0;
if(!inited) {
inited = 1;
process_start(&udp_socket_process, NULL);
}
}
/*---------------------------------------------------------------------------*/
int
udp_socket_register(struct udp_socket *c,
void *ptr,
udp_socket_input_callback_t input_callback)
{
init();
if(c == NULL) {
return -1;
}
c->ptr = ptr;
c->input_callback = input_callback;
c->p = PROCESS_CURRENT();
PROCESS_CONTEXT_BEGIN(&udp_socket_process);
c->udp_conn = udp_new(NULL, 0, c);
PROCESS_CONTEXT_END();
if(c->udp_conn == NULL) {
return -1;
}
return 1;
}
/*---------------------------------------------------------------------------*/
int
udp_socket_close(struct udp_socket *c)
{
if(c == NULL) {
return -1;
}
if(c->udp_conn != NULL) {
uip_udp_remove(c->udp_conn);
return 1;
}
return -1;
}
/*---------------------------------------------------------------------------*/
int
udp_socket_bind(struct udp_socket *c,
uint16_t local_port)
{
if(c == NULL || c->udp_conn == NULL) {
return -1;
}
udp_bind(c->udp_conn, UIP_HTONS(local_port));
return 1;
}
/*---------------------------------------------------------------------------*/
int
udp_socket_connect(struct udp_socket *c,
uip_ipaddr_t *remote_addr,
uint16_t remote_port)
{
if(c == NULL || c->udp_conn == NULL) {
return -1;
}
if(remote_addr != NULL) {
uip_ipaddr_copy(&c->udp_conn->ripaddr, remote_addr);
}
c->udp_conn->rport = UIP_HTONS(remote_port);
return 1;
}
/*---------------------------------------------------------------------------*/
int
udp_socket_send(struct udp_socket *c,
const void *data, uint16_t datalen)
{
if(c == NULL || c->udp_conn == NULL) {
return -1;
}
uip_udp_packet_send(c->udp_conn, data, datalen);
return datalen;
}
/*---------------------------------------------------------------------------*/
int
udp_socket_sendto(struct udp_socket *c,
const void *data, uint16_t datalen,
const uip_ipaddr_t *to,
uint16_t port)
{
if(c == NULL || c->udp_conn == NULL) {
return -1;
}
if(c->udp_conn != NULL) {
uip_udp_packet_sendto(c->udp_conn, data, datalen,
to, UIP_HTONS(port));
return datalen;
}
return -1;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(udp_socket_process, ev, data)
{
struct udp_socket *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 udp_socket_register() as the
struct udp_socket pointer. So we extract this
pointer and use it when calling the reception callback. */
c = (struct udp_socket *)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()) {
/* Copy the data from the uIP data buffer into our own
buffer to avoid the uIP buffer being messed with by the
callee. */
memcpy(buf, uip_appdata, uip_datalen());
/* Call the client process. We use the PROCESS_CONTEXT
mechanism to temporarily switch process context to the
client process. */
if(c->input_callback != NULL) {
PROCESS_CONTEXT_BEGIN(c->p);
c->input_callback(c, c->ptr,
&(UIP_IP_BUF->srcipaddr),
UIP_HTONS(UIP_IP_BUF->srcport),
&(UIP_IP_BUF->destipaddr),
UIP_HTONS(UIP_IP_BUF->destport),
buf, uip_datalen());
PROCESS_CONTEXT_END();
}
}
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/** @} */