Removed IP version checking code (since this is handled in the Sock constructor), and allowed server (but not client, yet) to quit game before round start

main.cpp

@@ -100,16 +100,9 @@ GameType check_server_client(int argc, char** argv) {
 		try {
 			addr_port = connect_code::decode(connect_code);
 			/* Check IP address version */
-			int ip_ver = 0;
 			if (check_ip_ver(addr_port[0].data()) < 0) {
 				throw std::invalid_argument("Invalid code entered.");
 			}
-			/* From here, assume address is either IPv4 or IPv6 */
-			if (check_ip_ver(addr_port[0].data()) == 4) {
-				ip_ver = 4;
-			} else {
-				ip_ver = 6;
-			}
 			Client* client = new Client(ES_UDP, addr_port[0].data(), std::stoi(addr_port[1]));
 			client->create_socket();
 			/* Send a specific message to the server, and wait for the appropriate response, to know that the server is ready */
@@ -387,11 +380,18 @@ int main(int argc, char** argv) {
 				}
 			}
 
-			/* For client (wait for start message from server) */
+			/* For client (wait for start or quit message from server): When the peer quits the
+			 game, it sends a serialized struct, containing all zeros, with the last bit turned
+			 on as a flag. We catch this zero bit, as it indicates that the peer quit the game. */
 			if (type.mode == M_CLIENT) {
 				do {
 					response = type.netsock->recvAll();
-				} while (response[0] != 'S');
+				} while (response[0] != 'S' && response[0] != 0);
+				if (response[0] == 0) {
+					CloseWindow();
+					std::cout << "Peer unexpectedly quit game." << std::endl;
+					return -1;
+				}
 				game_started = true;
 				std::cout << "Game has been started by server." << std::endl;
 			}