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

/*SYNTAX   ./clientTCPs (host)  */

char PORT[] = "47200";

int main(int argc, char * argv[])
{
    int n, s;
    char buf[1024];
    char hostname[64];
    struct addrinfo hints, *result, *tmp; 

    memset(&hints, 0, sizeof(hints)); /*It is important reset all to NULL*/

    switch(argc) {
        case 1:
            /* Get our local host name.  */
          gethostname(hostname, sizeof(hostname));
          break;
        case 2:
            /* Get name from command line */
          strcpy(hostname, argv[1]);
          break;
        default:
          printf("Usage: %s [server_name]\n",argv[0]);
          exit(-1);
    }
   
    hints.ai_family = AF_INET; //IPv4
    hints.ai_socktype = SOCK_STREAM; //TCP

    if ((getaddrinfo(hostname, PORT, &hints, &result)) != 0) { /*Checking status of getaddrinfo result*/
        fprintf(stderr, "getaddrinfo error\n");
        exit(EXIT_FAILURE);
    }

    /* getaddrinfo() returns a list of address structures.
    Try each address until we successfully connect.
    If socket (or connect) fails, we close the socket
    and try the next address. */

    for ( tmp = result; tmp != NULL; tmp = tmp->ai_next) {
      s =  socket(tmp->ai_family, tmp->ai_socktype, tmp->ai_protocol);
      if (s == -1) continue;
      if (connect(s, tmp->ai_addr, tmp->ai_addrlen) != 1)
        break; /*Success*/
      close(s);  
    }

    freeaddrinfo(result);           /* No longer needed */

    if (tmp == NULL) { /*No address succeeded*/
           fprintf(stderr, "Could not connect\n");
           exit(EXIT_FAILURE);
    }
    
    /* Read from standard input, and copy the
     * data to the socket. */
    while ((n = read(0, buf, sizeof(buf))) > 0) {
        if (send(s, buf, n, 0) < 0) {
            perror("send");
            exit(1);
        }
    }

    close(s);
    exit(0);
}