Simple networking

packet.h

#ifndef CURIOUS_NETWORKING_H
#define CURIOUS_NETWORKING_H

static const size_t packet_len = 1395;
static const char packet[] = {
    0x31, 0x2c, 0x20, 0x32, 0x2c, 0x20, 0x33, 0x2c, 0x20, 0x34, 0x2c, 0x20,
    0x35, 0x2c, 0x20, 0x36, 0x2c, 0x20, 0x37, 0x2c, 0x20, 0x38, 0x2c, 0x20,
    0x39, 0x2c, 0x20, 0x31, 0x30, 0x2c, 0x20, 0x31, 0x31, 0x2c, 0x20, 0x31,
    0x32, 0x2c, 0x20, 0x31, 0x33, 0x2c, 0x20, 0x31, 0x34, 0x2c, 0x20, 0x31,
    0x35, 0x2c, 0x20, 0x31, 0x36, 0x2c, 0x20, 0x31, 0x37, 0x2c, 0x20, 0x31,
    0x38, 0x2c, 0x20, 0x31, 0x39, 0x2c, 0x20, 0x32, 0x30, 0x2c, 0x20, 0x32,
    0x31, 0x2c, 0x20, 0x32, 0x32, 0x2c, 0x20, 0x32, 0x33, 0x2c, 0x20, 0x32,
    0x34, 0x2c, 0x20, 0x32, 0x35, 0x2c, 0x20, 0x32, 0x36, 0x2c, 0x20, 0x32,
    0x37, 0x2c, 0x20, 0x32, 0x38, 0x2c, 0x20, 0x32, 0x39, 0x2c, 0x20, 0x33,
    0x30, 0x2c, 0x20, 0x33, 0x31, 0x2c, 0x20, 0x33, 0x32, 0x2c, 0x20, 0x33,
    0x33, 0x2c, 0x20, 0x33, 0x34, 0x2c, 0x20, 0x33, 0x35, 0x2c, 0x20, 0x33,
    0x36, 0x2c, 0x20, 0x33, 0x37, 0x2c, 0x20, 0x33, 0x38, 0x2c, 0x20, 0x33,
    0x39, 0x2c, 0x20, 0x34, 0x30, 0x2c, 0x20, 0x34, 0x31, 0x2c, 0x20, 0x34,
    0x32, 0x2c, 0x20, 0x34, 0x33, 0x2c, 0x20, 0x34, 0x34, 0x2c, 0x20, 0x34,
    0x35, 0x2c, 0x20, 0x34, 0x36, 0x2c, 0x20, 0x34, 0x37, 0x2c, 0x20, 0x34,
    0x38, 0x2c, 0x20, 0x34, 0x39, 0x2c, 0x20, 0x35, 0x30, 0x2c, 0x20, 0x35,
    0x31, 0x2c, 0x20, 0x35, 0x32, 0x2c, 0x20, 0x35, 0x33, 0x2c, 0x20, 0x35,
    0x34, 0x2c, 0x20, 0x35, 0x35, 0x2c, 0x20, 0x35, 0x36, 0x2c, 0x20, 0x35,
    0x37, 0x2c, 0x20, 0x35, 0x38, 0x2c, 0x20, 0x35, 0x39, 0x2c, 0x20, 0x36,
    0x30, 0x2c, 0x20, 0x36, 0x31, 0x2c, 0x20, 0x36, 0x32, 0x2c, 0x20, 0x36,
    0x33, 0x2c, 0x20, 0x36, 0x34, 0x2c, 0x20, 0x36, 0x35, 0x2c, 0x20, 0x36,
    0x36, 0x2c, 0x20, 0x36, 0x37, 0x2c, 0x20, 0x36, 0x38, 0x2c, 0x20, 0x36,
    0x39, 0x2c, 0x20, 0x37, 0x30, 0x2c, 0x20, 0x37, 0x31, 0x2c, 0x20, 0x37,
    0x32, 0x2c, 0x20, 0x37, 0x33, 0x2c, 0x20, 0x37, 0x34, 0x2c, 0x20, 0x37,
    0x35, 0x2c, 0x20, 0x37, 0x36, 0x2c, 0x20, 0x37, 0x37, 0x2c, 0x20, 0x37,
    0x38, 0x2c, 0x20, 0x37, 0x39, 0x2c, 0x20, 0x38, 0x30, 0x2c, 0x20, 0x38,
    0x31, 0x2c, 0x20, 0x38, 0x32, 0x2c, 0x20, 0x38, 0x33, 0x2c, 0x20, 0x38,
    0x34, 0x2c, 0x20, 0x38, 0x35, 0x2c, 0x20, 0x38, 0x36, 0x2c, 0x20, 0x38,
    0x37, 0x2c, 0x20, 0x38, 0x38, 0x2c, 0x20, 0x38, 0x39, 0x2c, 0x20, 0x39,
    0x30, 0x2c, 0x20, 0x39, 0x31, 0x2c, 0x20, 0x39, 0x32, 0x2c, 0x20, 0x39,
    0x33, 0x2c, 0x20, 0x39, 0x34, 0x2c, 0x20, 0x39, 0x35, 0x2c, 0x20, 0x39,
    0x36, 0x2c, 0x20, 0x39, 0x37, 0x2c, 0x20, 0x39, 0x38, 0x2c, 0x20, 0x39,
    0x39, 0x2c, 0x20, 0x31, 0x30, 0x30, 0x2c, 0x20, 0x31, 0x30, 0x31, 0x2c,
    0x20, 0x31, 0x30, 0x32, 0x2c, 0x20, 0x31, 0x30, 0x33, 0x2c, 0x20, 0x31,
    0x30, 0x34, 0x2c, 0x20, 0x31, 0x30, 0x35, 0x2c, 0x20, 0x31, 0x30, 0x36,
    0x2c, 0x20, 0x31, 0x30, 0x37, 0x2c, 0x20, 0x31, 0x30, 0x38, 0x2c, 0x20,
    0x31, 0x30, 0x39, 0x2c, 0x20, 0x31, 0x31, 0x30, 0x2c, 0x20, 0x31, 0x31,
    0x31, 0x2c, 0x20, 0x31, 0x31, 0x32, 0x2c, 0x20, 0x31, 0x31, 0x33, 0x2c,
    0x20, 0x31, 0x31, 0x34, 0x2c, 0x20, 0x31, 0x31, 0x35, 0x2c, 0x20, 0x31,
    0x31, 0x36, 0x2c, 0x20, 0x31, 0x31, 0x37, 0x2c, 0x20, 0x31, 0x31, 0x38,
    0x2c, 0x20, 0x31, 0x31, 0x39, 0x2c, 0x20, 0x31, 0x32, 0x30, 0x2c, 0x20,
    0x31, 0x32, 0x31, 0x2c, 0x20, 0x31, 0x32, 0x32, 0x2c, 0x20, 0x31, 0x32,
    0x33, 0x2c, 0x20, 0x31, 0x32, 0x34, 0x2c, 0x20, 0x31, 0x32, 0x35, 0x2c,
    0x20, 0x31, 0x32, 0x36, 0x2c, 0x20, 0x31, 0x32, 0x37, 0x2c, 0x20, 0x31,
    0x32, 0x38, 0x2c, 0x20, 0x31, 0x32, 0x39, 0x2c, 0x20, 0x31, 0x33, 0x30,
    0x2c, 0x20, 0x31, 0x33, 0x31, 0x2c, 0x20, 0x31, 0x33, 0x32, 0x2c, 0x20,
    0x31, 0x33, 0x33, 0x2c, 0x20, 0x31, 0x33, 0x34, 0x2c, 0x20, 0x31, 0x33,
    0x35, 0x2c, 0x20, 0x31, 0x33, 0x36, 0x2c, 0x20, 0x31, 0x33, 0x37, 0x2c,
    0x20, 0x31, 0x33, 0x38, 0x2c, 0x20, 0x31, 0x33, 0x39, 0x2c, 0x20, 0x31,
    0x34, 0x30, 0x2c, 0x20, 0x31, 0x34, 0x31, 0x2c, 0x20, 0x31, 0x34, 0x32,
    0x2c, 0x20, 0x31, 0x34, 0x33, 0x2c, 0x20, 0x31, 0x34, 0x34, 0x2c, 0x20,
    0x31, 0x34, 0x35, 0x2c, 0x20, 0x31, 0x34, 0x36, 0x2c, 0x20, 0x31, 0x34,
    0x37, 0x2c, 0x20, 0x31, 0x34, 0x38, 0x2c, 0x20, 0x31, 0x34, 0x39, 0x2c,
    0x20, 0x31, 0x35, 0x30, 0x2c, 0x20, 0x31, 0x35, 0x31, 0x2c, 0x20, 0x31,
    0x35, 0x32, 0x2c, 0x20, 0x31, 0x35, 0x33, 0x2c, 0x20, 0x31, 0x35, 0x34,
    0x2c, 0x20, 0x31, 0x35, 0x35, 0x2c, 0x20, 0x31, 0x35, 0x36, 0x2c, 0x20,
    0x31, 0x35, 0x37, 0x2c, 0x20, 0x31, 0x35, 0x38, 0x2c, 0x20, 0x31, 0x35,
    0x39, 0x2c, 0x20, 0x31, 0x36, 0x30, 0x2c, 0x20, 0x31, 0x36, 0x31, 0x2c,
    0x20, 0x31, 0x36, 0x32, 0x2c, 0x20, 0x31, 0x36, 0x33, 0x2c, 0x20, 0x31,
    0x36, 0x34, 0x2c, 0x20, 0x31, 0x36, 0x35, 0x2c, 0x20, 0x31, 0x36, 0x36,
    0x2c, 0x20, 0x31, 0x36, 0x37, 0x2c, 0x20, 0x31, 0x36, 0x38, 0x2c, 0x20,
    0x31, 0x36, 0x39, 0x2c, 0x20, 0x31, 0x37, 0x30, 0x2c, 0x20, 0x31, 0x37,
    0x31, 0x2c, 0x20, 0x31, 0x37, 0x32, 0x2c, 0x20, 0x31, 0x37, 0x33, 0x2c,
    0x20, 0x31, 0x37, 0x34, 0x2c, 0x20, 0x31, 0x37, 0x35, 0x2c, 0x20, 0x31,
    0x37, 0x36, 0x2c, 0x20, 0x31, 0x37, 0x37, 0x2c, 0x20, 0x31, 0x37, 0x38,
    0x2c, 0x20, 0x31, 0x37, 0x39, 0x2c, 0x20, 0x31, 0x38, 0x30, 0x2c, 0x20,
    0x31, 0x38, 0x31, 0x2c, 0x20, 0x31, 0x38, 0x32, 0x2c, 0x20, 0x31, 0x38,
    0x33, 0x2c, 0x20, 0x31, 0x38, 0x34, 0x2c, 0x20, 0x31, 0x38, 0x35, 0x2c,
    0x20, 0x31, 0x38, 0x36, 0x2c, 0x20, 0x31, 0x38, 0x37, 0x2c, 0x20, 0x31,
    0x38, 0x38, 0x2c, 0x20, 0x31, 0x38, 0x39, 0x2c, 0x20, 0x31, 0x39, 0x30,
    0x2c, 0x20, 0x31, 0x39, 0x31, 0x2c, 0x20, 0x31, 0x39, 0x32, 0x2c, 0x20,
    0x31, 0x39, 0x33, 0x2c, 0x20, 0x31, 0x39, 0x34, 0x2c, 0x20, 0x31, 0x39,
    0x35, 0x2c, 0x20, 0x31, 0x39, 0x36, 0x2c, 0x20, 0x31, 0x39, 0x37, 0x2c,
    0x20, 0x31, 0x39, 0x38, 0x2c, 0x20, 0x31, 0x39, 0x39, 0x2c, 0x20, 0x32,
    0x30, 0x30, 0x2c, 0x20, 0x32, 0x30, 0x31, 0x2c, 0x20, 0x32, 0x30, 0x32,
    0x2c, 0x20, 0x32, 0x30, 0x33, 0x2c, 0x20, 0x32, 0x30, 0x34, 0x2c, 0x20,
    0x32, 0x30, 0x35, 0x2c, 0x20, 0x32, 0x30, 0x36, 0x2c, 0x20, 0x32, 0x30,
    0x37, 0x2c, 0x20, 0x32, 0x30, 0x38, 0x2c, 0x20, 0x32, 0x30, 0x39, 0x2c,
    0x20, 0x32, 0x31, 0x30, 0x2c, 0x20, 0x32, 0x31, 0x31, 0x2c, 0x20, 0x32,
    0x31, 0x32, 0x2c, 0x20, 0x32, 0x31, 0x33, 0x2c, 0x20, 0x32, 0x31, 0x34,
    0x2c, 0x20, 0x32, 0x31, 0x35, 0x2c, 0x20, 0x32, 0x31, 0x36, 0x2c, 0x20,
    0x32, 0x31, 0x37, 0x2c, 0x20, 0x32, 0x31, 0x38, 0x2c, 0x20, 0x32, 0x31,
    0x39, 0x2c, 0x20, 0x32, 0x32, 0x30, 0x2c, 0x20, 0x32, 0x32, 0x31, 0x2c,
    0x20, 0x32, 0x32, 0x32, 0x2c, 0x20, 0x32, 0x32, 0x33, 0x2c, 0x20, 0x32,
    0x32, 0x34, 0x2c, 0x20, 0x32, 0x32, 0x35, 0x2c, 0x20, 0x32, 0x32, 0x36,
    0x2c, 0x20, 0x32, 0x32, 0x37, 0x2c, 0x20, 0x32, 0x32, 0x38, 0x2c, 0x20,
    0x32, 0x32, 0x39, 0x2c, 0x20, 0x32, 0x33, 0x30, 0x2c, 0x20, 0x32, 0x33,
    0x31, 0x2c, 0x20, 0x32, 0x33, 0x32, 0x2c, 0x20, 0x32, 0x33, 0x33, 0x2c,
    0x20, 0x32, 0x33, 0x34, 0x2c, 0x20, 0x32, 0x33, 0x35, 0x2c, 0x20, 0x32,
    0x33, 0x36, 0x2c, 0x20, 0x32, 0x33, 0x37, 0x2c, 0x20, 0x32, 0x33, 0x38,
    0x2c, 0x20, 0x32, 0x33, 0x39, 0x2c, 0x20, 0x32, 0x34, 0x30, 0x2c, 0x20,
    0x32, 0x34, 0x31, 0x2c, 0x20, 0x32, 0x34, 0x32, 0x2c, 0x20, 0x32, 0x34,
    0x33, 0x2c, 0x20, 0x32, 0x34, 0x34, 0x2c, 0x20, 0x32, 0x34, 0x35, 0x2c,
    0x20, 0x32, 0x34, 0x36, 0x2c, 0x20, 0x32, 0x34, 0x37, 0x2c, 0x20, 0x32,
    0x34, 0x38, 0x2c, 0x20, 0x32, 0x34, 0x39, 0x2c, 0x20, 0x32, 0x35, 0x30,
    0x2c, 0x20, 0x32, 0x35, 0x31, 0x2c, 0x20, 0x32, 0x35, 0x32, 0x2c, 0x20,
    0x32, 0x35, 0x33, 0x2c, 0x20, 0x32, 0x35, 0x34, 0x2c, 0x20, 0x32, 0x35,
    0x35, 0x2c, 0x20, 0x32, 0x35, 0x36, 0x2c, 0x20, 0x32, 0x35, 0x37, 0x2c,
    0x20, 0x32, 0x35, 0x38, 0x2c, 0x20, 0x32, 0x35, 0x39, 0x2c, 0x20, 0x32,
    0x36, 0x30, 0x2c, 0x20, 0x32, 0x36, 0x31, 0x2c, 0x20, 0x32, 0x36, 0x32,
    0x2c, 0x20, 0x32, 0x36, 0x33, 0x2c, 0x20, 0x32, 0x36, 0x34, 0x2c, 0x20,
    0x32, 0x36, 0x35, 0x2c, 0x20, 0x32, 0x36, 0x36, 0x2c, 0x20, 0x32, 0x36,
    0x37, 0x2c, 0x20, 0x32, 0x36, 0x38, 0x2c, 0x20, 0x32, 0x36, 0x39, 0x2c,
    0x20, 0x32, 0x37, 0x30, 0x2c, 0x20, 0x32, 0x37, 0x31, 0x2c, 0x20, 0x32,
    0x37, 0x32, 0x2c, 0x20, 0x32, 0x37, 0x33, 0x2c, 0x20, 0x32, 0x37, 0x34,
    0x2c, 0x20, 0x32, 0x37, 0x35, 0x2c, 0x20, 0x32, 0x37, 0x36, 0x2c, 0x20,
    0x32, 0x37, 0x37, 0x2c, 0x20, 0x32, 0x37, 0x38, 0x2c, 0x20, 0x32, 0x37,
    0x39, 0x2c, 0x20, 0x32, 0x38, 0x30, 0x2c, 0x20, 0x32, 0x38, 0x31, 0x2c,
    0x20, 0x32, 0x38, 0x32, 0x2c, 0x20, 0x32, 0x38, 0x33, 0x2c, 0x20, 0x32,
    0x38, 0x34, 0x2c, 0x20, 0x32, 0x38, 0x35, 0x2c, 0x20, 0x32, 0x38, 0x36,
    0x2c, 0x20, 0x32, 0x38, 0x37, 0x2c, 0x20, 0x32, 0x38, 0x38, 0x2c, 0x20,
    0x32, 0x38, 0x39, 0x2c, 0x20, 0x32, 0x39, 0x30, 0x2c, 0x20, 0x32, 0x39,
    0x31, 0x2c, 0x20, 0x32, 0x39, 0x32, 0x2c, 0x20, 0x32, 0x39, 0x33, 0x2c,
    0x20, 0x32, 0x39, 0x34, 0x2c, 0x20, 0x32, 0x39, 0x35, 0x2c, 0x20, 0x32,
    0x39, 0x36, 0x2c, 0x20, 0x32, 0x39, 0x37, 0x2c, 0x20, 0x32, 0x39, 0x38,
    0x2c, 0x20, 0x32, 0x39, 0x39, 0x2c, 0x20, 0x33, 0x30, 0x30, 0x2c, 0x20,
    0x33, 0x30, 0x31};

#endif

udp_splurger.c

#define _GNU_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <time.h>

#include "packet.h"

static const unsigned int send_buffer_size = 2097152;

static const char dest_addr[] = {0xc0, 0xa8, 0x08, 0x6a};
static const char dest_port[] = {0x13, 0x56};

static void write_packets(size_t n_packets, int loops, const char *id)
{
    printf("%s: Writing simple data packets...\n", id);

    int fd = socket(AF_INET, SOCK_DGRAM, 0);

    struct sockaddr_in addr = {0};

    addr.sin_family = AF_INET;
    memcpy(&addr.sin_port, dest_port, sizeof(addr.sin_port));
    memcpy(&addr.sin_addr, dest_addr, sizeof(addr.sin_addr));

    int ret;

    for(int n=0; n<loops; n++){
        struct timespec time_before, time_after;
        clock_gettime(CLOCK_MONOTONIC, &time_before);

        for(int i=0; i<n_packets; i++){
            ret = sendto(fd, packet, packet_len, 0,
                    (const struct sockaddr *)&addr, sizeof(struct sockaddr_in));
        }

        clock_gettime(CLOCK_MONOTONIC, &time_after);

        uint64_t before_nanoseconds = (
                ((uint64_t)time_before.tv_sec) * 1000000000 +
                (uint64_t)time_before.tv_nsec);

        uint64_t after_nanoseconds = (
                ((uint64_t)time_after.tv_sec) * 1000000000 +
                (uint64_t)time_after.tv_nsec);

        uint64_t runtime_nanoseconds = after_nanoseconds - before_nanoseconds;

        double runtime_seconds = ((double)runtime_nanoseconds)/1e9;
        double mbps = (8 * n_packets * packet_len)/(1e6 * runtime_seconds);

        printf("%s: Runtime to send %d packets: %f seconds (%f Mbits per second)\n",
                id, n_packets, runtime_seconds, mbps);
    }
    close(fd);

}

int main(int argc, char **argv)
{
    write_packets(131072, 3, argv[1]);

	return 0;
}