#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>


int main(int argc, char **argv)
{
    int sockfd;
    socklen_t addrlen;
    struct sockaddr_in dest;

    // check the number of args on command line
    if(argc != 4)
    {
        printf("USAGE: %s @dest port_num string\n", argv[0]);
        exit(-1);
    }

        // socket factory
        if((sockfd = socket(...)) == -1)
        {
                perror("socket");
                exit(EXIT_FAILURE);
        }

        // init remote addr structure and other params
        dest.sin_family = AF_INET;
        dest.sin_port   = htons(atoi(argv[2]));
        addrlen         = sizeof(struct sockaddr_in);

        // get addr from command line and convert it
        if(inet_pton(...) != 1)
        {
                perror("inet_pton");
                close(sockfd);
                exit(EXIT_FAILURE);
        }

        // send string
        if(sendto(...) == -1)
        {
                perror("sendto");
                close(sockfd);
                exit(EXIT_FAILURE);
        }

        // close the socket
        close(sockfd);

        return 0;
}