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

void error(char *msg)
{
    perror(msg);
    exit(0);
}

void sendData( int sockfd, char* buffer )
{
    if (write( sockfd, buffer, 512 ) < 0 )
        error( (char*)"ERROR writing to socket" );
}

void getData( int sockfd, char* buffer)
{
    if (read(sockfd,buffer,512) < 0 )
        error( (char*)"ERROR reading from socket");
}

int main(int argc, char *argv[])
{
    int sockfd01, portno01 = 51000;
    int sockfd02, portno02 = 51500;
    char serverIp[] = "localhost";
    struct sockaddr_in serv_addr01;
    struct sockaddr_in serv_addr02;
    struct hostent *server01;
    struct hostent *server02;
    char buffer[512];

    if ((sockfd01 = socket(AF_INET, SOCK_STREAM, 0) ) < 0 )
        error( (char*)"ERROR opening socket");

    if ((server01 = gethostbyname(serverIp ) ) == NULL )
        error( (char*)"ERROR, no such host\n");

    bzero((char *) &serv_addr01, sizeof(serv_addr01));
    serv_addr01.sin_family = AF_INET;
    bcopy((char *)server01->h_addr, (char *)&serv_addr01.sin_addr.s_addr, server01->h_length);
    serv_addr01.sin_port = htons(portno01);
    if (connect(sockfd01, (struct sockaddr *)&serv_addr01, sizeof(serv_addr01)) < 0)
        error( (char*)"ERROR connecting");

    sendData(sockfd01, buffer);
    printf("sent first byte %d second byte %d\n", buffer[0], buffer[1]);
    close(sockfd01);

    if ((sockfd02 = socket(AF_INET, SOCK_STREAM, 0) ) < 0 )
        error( (char*)"ERROR opening socket");

    if ((server02 = gethostbyname(serverIp ) ) == NULL )
        error( (char*)"ERROR, no such host\n");

    bzero((char *) &serv_addr02, sizeof(serv_addr02));
    serv_addr02.sin_family = AF_INET;
    bcopy((char *)server02->h_addr, (char *)&serv_addr02.sin_addr.s_addr, server02->h_length);
    serv_addr02.sin_port = htons(portno02);
    if (connect(sockfd02, (struct sockaddr *)&serv_addr02, sizeof(serv_addr02)) < 0)
        error( (char*)"ERROR connecting");

    getData(sockfd02, buffer);
    printf("received first byte %d second byte %d\n", buffer[0], buffer[1]);

    close(sockfd02);

    return 0;
}