client

#include<stdio.h>      //printf
#include<string.h>     //strlen
#include<stdlib.h>    //atoi
#include<sys/socket.h> //socket
#include<arpa/inet.h>  //inet_addr
#include <fcntl.h>     //for open
#include <unistd.h>    //for close

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT 27015

char username[32],password[15];
char chek[2];


void SendMessage();
void ReceiveMessage();
void LogIn();
void LogOut();



void LogIn()
{
			int j;


	begin:

			for(j = 0; j < 15; j++)
				username[j] = '\0';

			for(j = 0; j < 15; j++)
				password[j] = '\0';

			printf("\n");
			printf(" \n  Connecting to proxy server \n");
			printf("\n");
			char buffer[256];
		char *ptrBuff;
		ptrBuff = buffer;
		*(ptrBuff++) = 5;
		*(ptrBuff++) = 2;
		*(ptrBuff++) = 0x00;
		*(ptrBuff++) = 0x02;
			send(proxySocket, ptrBuff, buffer-ptrBuff, 0);

    	printf("Username: ");
				gets(username);
    	printf("Password: ");
				gets(password);

    	send(sock, username, 15, 0);
			send(sock, password, 15, 0);

			recv(Proxysock, chek, 2, 0);
			if(chek[0] == '0'){
				printf("\n Wrong username/password! Try again. \n");
				goto begin;
   		}
			else if(chek[0] == '1')
				printf("\n You have access to server\n");

}


void ReceiveMessage()
{

			char message[20];
			int j;

			recv(Proxysock,message,256,0);
			printf(" \n You sent this message to server \n");

			printf(message);
			printf("\n");


}

void SendMessage()
{

			char message[256];

			printf("\n Send message to server.\n");

					printf("\n Message: \n");
					printf("\n");
					scanf(" %s",message);
					if(send(Proxysock, message, 256, 0) < 0)
						printf("Sending failed.");
					else
						printf("\n Message sent to server.\n", receiver);


}

void LogOut()
{

			printf("\n You are logged out.\n\n");
			printf(" \n --------------------- \n");

			LogIn();

}

int main(int argc , char *argv[])
{
	char option='1';
    char answer='N';
    struct sockaddr_in proxy_server_side;

    Proxysock = socket(AF_INET , SOCK_STREAM , 0);

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

    if (connect(Proxysock , (struct sockaddr *)&proxy_server_side , sizeof(proxy_server_side)) < 0){
        perror("Connect failed. Error");
        return 1;
    }

    LogIn();

    while(answer=='N')
    {

		SendMessage();
		ReceiveMessage();
		printf("Would you like to dissconnect?  Y/N \n");
		scanf(answer);
   }
   send(Proxysock,option,2,0);
   LogOut();

    close(Proxysock);

    return 0;
}