#include<stdio.h>
#include<string.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<unistd.h>

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT   27015

   int socket_desc , client_sock , c , read_size;
   struct sockaddr_in server , client;
   char client_message[DEFAULT_BUFLEN];
   char username[] = "user";
   char password[] = "password";
   char succ[] = "success!";
   char fail[] = "failure!";
   char message1[DEFAULT_BUFLEN], message2[DEFAULT_BUFLEN];

void login();

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


    login();



    if(read_size == 0)
    {
        puts("Client disconnected");
        fflush(stdout);
    }
    else if(read_size == -1)
    {
        perror("recv failed");
    }

    return 0;
}

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

    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons( DEFAULT_PORT );

    if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
    {
        perror("bind failed. Error");
        return;
    }

    puts("bind done");

    listen(socket_desc , 3);

    puts("Waiting for incoming connections...");
    c = sizeof(struct sockaddr_in);

    client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c);
    if (client_sock < 0)
    {
        perror("accept failed");
        return;
    }
    puts("Connection accepted");

	while(1)
    {
		memset(client_message,0,strlen(client_message));
		if((read_size=recv(client_sock , client_message , 		DEFAULT_BUFLEN , 0)) < 0){
		puts("recv failed");
		return;
	}
		strcpy(message1, client_message);

		if((read_size=recv(client_sock , client_message , 		DEFAULT_BUFLEN , 0)) < 0){
		puts("recv failed");
		return;
	}
		strcpy(message2, client_message);

		if((strcmp(message1, username)!=0) || (strcmp(message2, password)!=0)){
			if(send(client_sock, fail, strlen(fail), 0)<0)
			{
			puts("Send failed");
			return;
			}
		}
		else{
			if(send(client_sock, succ, strlen(succ), 0)<0)
			{
			puts("Send failed");
			return;
			}
			break;
		}
    }

}