//	echoServer.cpp - Use: echoServer
//	Visual C++ Project | Settings | Link | Object/Library modules | ws2_32.lib 

#define WIN32_LEAN_AND_MEAN 
#include <winsock2.h> 
#include <iostream.h>

int main(void)
{
	char				buffer[128]; 
	int					retval, sinlen; 
	struct sockaddr_in	sin; 
	WSADATA				wsaData; 
	SOCKET				s, h; 

	WSAStartup(0x202,&wsaData);
 
	sin.sin_family = AF_INET; 
	sin.sin_addr.s_addr = INADDR_ANY;
	sin.sin_port = htons(888);				// Port 888
											// SOCK_STREAM is TCP
	if ((s = socket(AF_INET, SOCK_STREAM,0)) == INVALID_SOCKET){ 
		cout << "socket() failed with error " << WSAGetLastError() << '\n'; 
		return -1; 
	} 
											// Bind socket to local port	
	if (bind(s,(struct sockaddr*)&sin,sizeof(sin) ) == SOCKET_ERROR) { 
		cout << "bind() failed with error " << WSAGetLastError() << '\n'; 
		return -1; 
	} 
											// Listen for 1 socekt connection
	if (listen(s,1)== SOCKET_ERROR) { 
		cout << "listen() failed with error " << WSAGetLastError() << '\n'; 
		return -1; 
	} 
	sinlen = sizeof(sin); 
	
	while(1) {								// Accept incoming connection 	
	  if ((h=accept(s,(struct sockaddr*)&sin,&sinlen )) == INVALID_SOCKET) { 
		cout << "accept() failed with error " << WSAGetLastError() << '\n'; 
		return -1; 
	  } 
	  cout << "Opened connection.\n";	flush(cout);
											// receive while connection not closed
	  while((retval=recv(h,buffer,sizeof(buffer),0)) != SOCKET_ERROR && retval != 0){ 
											// Make into 0 terminated string
		if(retval < sizeof(buffer))
			buffer[retval]='\0';

		cout << "Received " << buffer << "\n"; 		flush(cout); 
											// Echo what is received
		send(h,buffer,strlen(buffer)+1,0);
	  } 
	  closesocket(h);
	  cout << "Closed connection.\n";	flush(cout);
	}
	return 0;
}