152 lines
4.5 KiB
C
152 lines
4.5 KiB
C
/*
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* Copyright (c) 2011-2012, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* \file
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* Code for sending the JSON data as a UDP packet
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* Specify proto = "udp", port = <server-udp-port>
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* host = <ipv6-server-address>
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*
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* \author
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* Niclas Finne <nfi@sics.se>
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* Joakim Eriksson <joakime@sics.se>
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*/
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#include "contiki.h"
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#include "httpd-ws.h"
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#include "jsontree.h"
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#include "jsonparse.h"
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#include "json-ws.h"
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#include <stdio.h>
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#include <string.h>
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#define DEBUG DEBUG_FULL
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#include "net/ip/uip-debug.h"
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static struct uip_udp_conn *client_conn;
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static uip_ipaddr_t server_ipaddr;
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static uint16_t server_port;
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#define SENDER_PORT 8181
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/*---------------------------------------------------------------------------*/
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int
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json_ws_udp_setup(const char *host, uint16_t port)
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{
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server_port = port;
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if(client_conn != NULL) {
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/* this should be a macro uip_udp_conn_free() or something */
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uip_udp_remove(client_conn);
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client_conn = NULL;
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}
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uip_ipaddr_t *ipaddr;
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/* First check if the host is an IP address. */
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ipaddr = &server_ipaddr;
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if(uiplib_ipaddrconv(host, &server_ipaddr) == 0) {
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#if 0 && UIP_UDP
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if(resolv_lookup(host, &ipaddr) != RESOLV_STATUS_CACHED) {
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return 0;
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}
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#else /* UIP_UDP */
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return 0;
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#endif /* UIP_UDP */
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}
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/* new connection with remote host */
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client_conn = udp_new(&server_ipaddr, UIP_HTONS(server_port), NULL);
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udp_bind(client_conn, UIP_HTONS(SENDER_PORT));
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PRINTF("Created a connection with the server ");
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PRINT6ADDR(&client_conn->ripaddr);
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PRINTF(" local/remote port %u/%u\n",
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UIP_HTONS(client_conn->lport), UIP_HTONS(client_conn->rport));
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static char *udp_buf;
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static int pos;
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static int size;
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static int
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putchar_udp(int c)
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{
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if(udp_buf != NULL && pos <= size) {
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udp_buf[pos++] = c;
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return c;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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void
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json_ws_udp_send(struct jsontree_value *tree, const char *path)
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{
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struct jsontree_context json;
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/* maxsize = 70 bytes */
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char buf[70];
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udp_buf = buf;
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/* reset state and set max-size */
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/* NOTE: packet will be truncated at 70 bytes */
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pos = 0;
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size = sizeof(buf);
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json.values[0] = (struct json_value *)tree;
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jsontree_reset(&json);
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find_json_path(&json, path);
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json.path = json.depth;
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json.putchar = putchar_udp;
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while(jsontree_print_next(&json) && json.path <= json.depth);
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printf("Real UDP size: %d\n", pos);
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buf[pos] = 0;
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uip_udp_packet_sendto(client_conn, &buf, pos,
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&server_ipaddr, UIP_HTONS(server_port));
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}
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/*---------------------------------------------------------------------------*/
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void
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json_ws_udp_debug(char *string)
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{
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int len;
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len = strlen(string);
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uip_udp_packet_sendto(client_conn, string, len,
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&server_ipaddr, UIP_HTONS(server_port));
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}
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/*---------------------------------------------------------------------------*/
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