#include <sys/socket.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "unp.h"
#define MAXBUF 4096 // make length with server and client
//int main(int argc, char **argv)
int main(int argc, char *argv[])
{
    int server_sockfd, client_sockfd;
    int client_len, n;
    char buf[MAXBUF];
    struct sockaddr_in clientaddr, serveraddr;

    client_len = sizeof(clientaddr);

    if((server_sockfd = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
    {
        perror("socket error : ");
        exit(0);
    }
    memset(&serveraddr,0X00,sizeof(serveraddr));
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
    serveraddr.sin_port = htons(SERV_PORT);

    bind(server_sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
    listen(server_sockfd, 5);

    while(1)
    {
        memset(buf,0X00,MAXBUF);
        client_sockfd = accept(server_sockfd, (struct sockaddr *)&clientaddr, &client_len);
        printf(" New Client Connect: %s\n", inet_ntoa(clientaddr.sin_addr));
        if((n =read(client_sockfd, buf, MAXBUF)) < 0)
        {
            close(client_sockfd);
            continue;
        }
        if(write(client_sockfd, buf, MAXBUF) < 0 )
        {
            perror("write error :");
            close(client_sockfd);
        }
        close(client_sockfd);
    }
    close(server_sockfd);
    return 0;
}  

#include<stdio.h>
#include<winsock2.h>
// Window Client version 
#define PORT        3500
#define IP      "127.0.0.1"

void main(void)
{
    WSADATA WSAData;
    SOCKADDR_IN addr;
    SOCKET s;
    char buffer[4096];
    int readbytes;
    int i, len;

    if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0)
    {
        return 1;
    }

    s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (s == INVALID_SOCKET)
    {
        return 1;
    }

    addr.sin_family = AF_INET;
    addr.sin_port = htons(PORT);
    addr.sin_addr.S_un.S_addr = inet_addr(IP);

    if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
    {
        printf("fail to connect\n");
        closesocket(s);
        return 1;
    }

    printf("enter messages\n");

    for (i = 0; 1; i++)
    {
        buffer[i] = getchar();
        if (buffer[i] == '\n')
        {
            buffer[i++] = '\n';
            break;
        }
    }

    len = i;

    printf("send messages(%d bytes)\n", len);
    send(s, buffer, len, 0);

    for (readbytes = 0; readbytes<len;)
        readbytes += recv(s, buffer + readbytes, len - readbytes, 0);

    printf("recv messages = %s\n", buffer);

    closesocket(s);
    WSACleanup();
    return 0;
}