ping.c
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/*
* Copyright (C) 2015 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup examples
* @{
*
* @file
* @brief Demonstrating the sending and receiving of UDP data over POSIX sockets.
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*
* @}
*/
#include <stdbool.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdatomic.h>
#include <stdio.h>
#include "byteorder.h"
#include "net/icmpv6.h"
#include "net/ipv6.h"
#include "xtimer.h"
#include "uip.h"
#include "uip-icmp6.h"
#include "common.h"
#define ECHO_ID (0xd1e9)
static struct uip_icmp6_echo_reply_notification recv_ntfy = { NULL, NULL };
static uint16_t seq = 0;
static atomic_int received = ATOMIC_VAR_INIT(0);
static atomic_int num = ATOMIC_VAR_INIT(0);
static bool _waiting = true;
static inline icmpv6_echo_t *uip_icmp_buf(void)
{
return ((icmpv6_echo_t *)&uip_buf[uip_l2_l3_hdr_len]);
}
static inline int max_len(void)
{
return UIP_BUFSIZE - (((uint8_t *)uip_icmp_buf()) - uip_buf) -
sizeof(icmpv6_echo_t);
}
static int ping_send(const uip_ipaddr_t *dst, int payload_len)
{
int len = payload_len;
icmpv6_echo_t *ping = uip_icmp_buf();
ping->id = byteorder_htons(ECHO_ID);
if (payload_len > max_len()) {
puts("Payload too long for buffer.");
return -1;
}
for (network_uint16_t *payload = (network_uint16_t *)(ping + 1);
len >= 0;
payload++, len -= 2) {
*payload = byteorder_htons(seq);
}
ping->seq = byteorder_htons(seq++);
uip_icmp6_send((const uip_ipaddr_t *)dst, ICMPV6_ECHO_REQ, 0,
payload_len + (sizeof(icmpv6_echo_t) - sizeof(icmpv6_hdr_t)));
return 0;
}
static void handle_reply(uip_ipaddr_t *source, uint8_t ttl, uint8_t *data,
uint16_t datalen)
{
char addr_str[IPV6_ADDR_MAX_STR_LEN];
icmpv6_echo_t *ping = (icmpv6_echo_t *)data;
_waiting = false;
ipv6_addr_to_str(addr_str, (ipv6_addr_t *)source, sizeof(addr_str));
atomic_fetch_add(&received, 1);
printf("%" PRIu16 " bytes from %s: icmp_seq=%" PRIu16 " ttl=%u quota=%i/%i\n",
datalen, addr_str, byteorder_ntohs(ping->seq), (unsigned)ttl,
atomic_load(&received), atomic_load(&num));
}
void usage(char *cmd)
{
printf("usage: %s <dst> [<num>] [<payload_len>]\n", cmd);
}
int ping_cmd(int argc, char **argv)
{
ipv6_addr_t dst;
int payload_len, _num;
if ((argc < 2) || (ipv6_addr_from_str(&dst, argv[1]) == NULL)) {
usage(argv[0]);
return 1;
}
if ((argc < 3) || ((_num = atoi(argv[2])) == 0)) {
_num = 3;
}
if ((argc < 4) || ((payload_len = atoi(argv[3])) == 0)) {
payload_len = 16;
}
atomic_store(&num, _num);
atomic_store(&received, 0);
seq = 0;
if (recv_ntfy.callback == NULL) {
uip_icmp6_echo_reply_callback_add(&recv_ntfy, handle_reply);
}
for (uint16_t i = 0; i < _num; i++) {
_waiting = true;
ping_send((uip_ipaddr_t *)&dst, payload_len);
xtimer_usleep(1000000);
if (_waiting) {
puts("Timeout");
}
}
return 0;
}
/** @} */