nes-proj/examples/ipv6/json-ws/json-ws-udp.c

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/*
* Copyright (c) 2011-2012, 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.
*
*/
/**
* \file
* Code for sending the JSON data as a UDP packet
* Specify proto = "udp", port = <server-udp-port>
* host = <ipv6-server-address>
*
* \author
* Niclas Finne <nfi@sics.se>
* Joakim Eriksson <joakime@sics.se>
*/
#include "contiki.h"
#include "httpd-ws.h"
#include "jsontree.h"
#include "jsonparse.h"
#include "json-ws.h"
#include <stdio.h>
#include <string.h>
#define DEBUG DEBUG_FULL
#include "net/uip-debug.h"
static struct uip_udp_conn *client_conn;
static uip_ipaddr_t server_ipaddr;
static uint16_t server_port;
#define SENDER_PORT 8181
/*---------------------------------------------------------------------------*/
int
json_ws_udp_setup(const char *host, uint16_t port)
{
server_port = port;
if(client_conn != NULL) {
/* this should be a macro uip_udp_conn_free() or something */
uip_udp_remove(client_conn);
client_conn = NULL;
}
uip_ipaddr_t *ipaddr;
/* First check if the host is an IP address. */
ipaddr = &server_ipaddr;
if(uiplib_ipaddrconv(host, &server_ipaddr) == 0) {
#if 0 && UIP_UDP
ipaddr = resolv_lookup(host);
if(ipaddr == NULL) {
return 0;
}
#else /* UIP_UDP */
return 0;
#endif /* UIP_UDP */
}
/* new connection with remote host */
client_conn = udp_new(&server_ipaddr, UIP_HTONS(server_port), NULL);
udp_bind(client_conn, UIP_HTONS(SENDER_PORT));
PRINTF("Created a connection with the server ");
PRINT6ADDR(&client_conn->ripaddr);
PRINTF(" local/remote port %u/%u\n",
UIP_HTONS(client_conn->lport), UIP_HTONS(client_conn->rport));
return 1;
}
/*---------------------------------------------------------------------------*/
static char *udp_buf;
static int pos;
static int size;
static int
putchar_udp(int c)
{
if(udp_buf != NULL && pos <= size) {
udp_buf[pos++] = c;
return c;
}
return 0;
}
/*---------------------------------------------------------------------------*/
void
json_ws_udp_send(struct jsontree_value *tree, const char *path)
{
struct jsontree_context json;
/* maxsize = 70 bytes */
char buf[70];
udp_buf = buf;
/* reset state and set max-size */
/* NOTE: packet will be truncated at 70 bytes */
pos = 0;
size = sizeof(buf);
json.values[0] = (struct json_value *)tree;
jsontree_reset(&json);
find_json_path(&json, path);
json.path = json.depth;
json.putchar = putchar_udp;
while(jsontree_print_next(&json) && json.path <= json.depth);
printf("Real UDP size: %d\n", pos);
buf[pos] = 0;
uip_udp_packet_sendto(client_conn, &buf, pos,
&server_ipaddr, UIP_HTONS(server_port));
}
/*---------------------------------------------------------------------------*/
void
json_ws_udp_debug(char *string)
{
int len;
len = strlen(string);
uip_udp_packet_sendto(client_conn, string, len,
&server_ipaddr, UIP_HTONS(server_port));
}
/*---------------------------------------------------------------------------*/