/*
    ********************************************************************
    Odsek:          Elektrotehnika i racunarstvo
    Departman:      Racunarstvo i automatika
    Katedra:        Racunarska tehnika i racunarske komunikacije (RT-RK)
    Predmet:        Osnovi Racunarskih Mreza 1
    Godina studija: Treca (III)
    Skolska godina: 2018/2019
    Semestar:       Zimski (V)

    Ime fajla:      client.c
    Opis:           TCP klijent

    Platforma:      Raspberry Pi 2 - Model B
    OS:             Raspbian
    ********************************************************************
*/
#include<stdio.h>
#include<string.h>
#include<sys/socket.h>
#include<arpa/inet.h>

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT   27015

int sock;
struct sockaddr_in server;
char message[DEFAULT_BUFLEN] , server_reply[DEFAULT_BUFLEN];
char user[DEFAULT_BUFLEN];
char password[DEFAULT_BUFLEN];

void login();

int main(int argc , char *argv[])
{

    //keep communicating with server
    login();

    close(sock);

    return 0;
}

void login(){
	//Create socket
    sock = socket(AF_INET , SOCK_STREAM , 0);
    if (sock == -1)
    {
        printf("Could not create socket");
    }
    puts("Socket created");

    server.sin_addr.s_addr = inet_addr("127.0.0.1");
    server.sin_family = AF_INET;
    server.sin_port = htons( DEFAULT_PORT );

    //Connect to remote server
    if (connect(sock , (struct sockaddr *)&server , sizeof(server)) < 0)
    {
        perror("connect failed. Error");
        return;
    }

    puts("Connected\n");
    while(1)
    {
		memset(server_reply,0,strlen(server_reply));
        printf("Enter username : ");
        scanf("%s" , user);

        //Send some data
        if( send(sock , user , strlen(user) , 0) < 0)
        {
            puts("Send failed");
            return;
        }

		printf("Enter password : ");
        scanf("%s" , password);

        //Send some data
        if( send(sock , password , strlen(password) , 0) < 0)
        {
            puts("Send failed");
            return;
        }


        //Receive a reply from the server
        if( recv(sock , server_reply , DEFAULT_BUFLEN , 0) < 0)
        {
            puts("recv failed");
            break;
        }

        puts("Server reply :");
        puts(server_reply);

		if(strcmp(server_reply, "success!") == 0){
			return;
		}
    }
}