nes-proj/examples/udp-ipv6/udp-server.c

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/*
* 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-lib.h"
#include "contiki-net.h"
#include <string.h>
#define DEBUG DEBUG_PRINT
#include "net/uip-debug.h"
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define MAX_PAYLOAD_LEN 120
static struct uip_udp_conn *server_conn;
PROCESS(udp_server_process, "UDP server process");
AUTOSTART_PROCESSES(&udp_server_process);
/*---------------------------------------------------------------------------*/
static void
tcpip_handler(void)
{
static int seq_id;
char buf[MAX_PAYLOAD_LEN];
if(uip_newdata()) {
((char *)uip_appdata)[uip_datalen()] = 0;
PRINTF("Server received: '%s' from ", (char *)uip_appdata);
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
PRINTF("\n");
uip_ipaddr_copy(&server_conn->ripaddr, &UIP_IP_BUF->srcipaddr);
PRINTF("Responding with message: ");
sprintf(buf, "Hello from the server! (%d)", ++seq_id);
PRINTF("%s\n", buf);
uip_udp_packet_send(server_conn, buf, strlen(buf));
/* Restore server connection to allow data from any node */
memset(&server_conn->ripaddr, 0, sizeof(server_conn->ripaddr));
}
}
/*---------------------------------------------------------------------------*/
static void
print_local_addresses(void)
{
int i;
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uint8_t state;
PRINTF("Server IPv6 addresses: ");
for(i = 0; i < UIP_DS6_ADDR_NB; i++) {
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state = uip_ds6_if.addr_list[i].state;
if(uip_ds6_if.addr_list[i].isused &&
(state == ADDR_TENTATIVE || state == ADDR_PREFERRED)) {
PRINT6ADDR(&uip_ds6_if.addr_list[i].ipaddr);
PRINTF("\n");
}
}
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(udp_server_process, ev, data)
{
#if UIP_CONF_ROUTER
uip_ipaddr_t ipaddr;
#endif /* UIP_CONF_ROUTER */
PROCESS_BEGIN();
PRINTF("UDP server started\n");
#if UIP_CONF_ROUTER
uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
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uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
#endif /* UIP_CONF_ROUTER */
print_local_addresses();
server_conn = udp_new(NULL, HTONS(3001), NULL);
udp_bind(server_conn, HTONS(3000));
while(1) {
PROCESS_YIELD();
if(ev == tcpip_event) {
tcpip_handler();
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/