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

    #define PORT 3490 // the port client will be connecting to

    #define MAXDATASIZE 100 // max number of bytes we can get at once

    int main(int argc, char *argv[])
    {
        int sockfd, numbytes;  
        char buf[MAXDATASIZE];
        char buff[100];
        struct hostent *he;
        struct sockaddr_in their_addr; // connector's address information

        if (argc != 2) {
            fprintf(stderr,"usage: client hostname\n");
            exit(1);
        }

        if ((he=gethostbyname(argv[1])) == NULL) {  // get the host info
            perror("gethostbyname");
            exit(1);
        }

        if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
            perror("socket");
            exit(1);
        }

        their_addr.sin_family = AF_INET;    // host byte order
        their_addr.sin_port = htons(PORT);  // short, network byte order
        their_addr.sin_addr = *((struct in_addr *)he->h_addr);
        memset(&(their_addr.sin_zero), 0,8);  // zero the rest of the struct

        if (connect(sockfd, (struct sockaddr *)&their_addr,
                                              sizeof(struct sockaddr)) == -1) {
            perror("connect");
            exit(1);
        }
        gets(buff);
        buff[2] = '\n';
        printf("buf: %s\n", buff);
        numbytes = send(sockfd, buff, 3,0); 
        printf("Sent: %d bytes\n", numbytes);
        if ((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) == -1) {
            perror("recv");
            exit(1);
        }

        buf[numbytes] = '\0';

        printf("Received: %s",buf);

        close(sockfd);

        return 0;
    }