214 lines
6.9 KiB
C
214 lines
6.9 KiB
C
// =========================================
|
|
// | Spacewar Server.c |
|
|
// | Copyright (C) 2023, Barra Ó Catháin |
|
|
// | See end of file for copyright notice. |
|
|
// =========================================
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <stdbool.h>
|
|
#include <pthread.h>
|
|
#include <sys/epoll.h>
|
|
#include <sys/types.h>
|
|
#include <arpa/inet.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include "Spacewar-Physics.h"
|
|
#include "Spacewar-Messages.h"
|
|
|
|
void * runServerPhysics(void * parameters)
|
|
{
|
|
SpacewarState * state = (SpacewarState *)parameters;
|
|
|
|
while (true)
|
|
{
|
|
// doPhysicsTick(state);
|
|
usleep(15625);
|
|
}
|
|
}
|
|
|
|
// Creates a Spacewar server, intended to be ran by the standalone server or forked by the game client:
|
|
void * runSpacewarServer(void * configuration)
|
|
{
|
|
SpacewarServerConfiguration * serverConfig = (SpacewarServerConfiguration *)configuration;
|
|
printf("Starting Server. \n");
|
|
|
|
// Initialize a simulation:
|
|
SpacewarState * currentState = calloc(1, sizeof(SpacewarState));
|
|
|
|
// Create our network listeners:
|
|
int masterSocket = socket(AF_INET, SOCK_STREAM, 0);
|
|
int masterListeningSocket = socket(AF_INET, SOCK_DGRAM, 0);
|
|
int masterSendingSocket = socket(AF_INET, SOCK_DGRAM, 0);
|
|
|
|
if (masterListeningSocket < 0 || masterSendingSocket < 0 || masterSocket < 0)
|
|
{
|
|
fprintf(stderr, "Failed to create socket.\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
// Make the socket timeout:
|
|
struct timeval readTimeout;
|
|
readTimeout.tv_sec = 0;
|
|
readTimeout.tv_usec = 800;
|
|
setsockopt(masterListeningSocket, SOL_SOCKET, SO_RCVTIMEO, &readTimeout, sizeof(readTimeout));
|
|
|
|
// Create a structure to store the address we're sending to:
|
|
struct sockaddr_in sendingAddress;
|
|
sendingAddress.sin_family = AF_INET; // IPv4
|
|
sendingAddress.sin_addr.s_addr = inet_addr("127.0.0.1");
|
|
sendingAddress.sin_port = htons(serverConfig->port);
|
|
|
|
// Create a structure to bind the listening socket:
|
|
struct sockaddr_in listeningAddress;
|
|
memset(&listeningAddress, 0, sizeof(listeningAddress));
|
|
listeningAddress.sin_family = AF_INET; // IPv4
|
|
listeningAddress.sin_addr.s_addr = INADDR_ANY;
|
|
listeningAddress.sin_port = htons(serverConfig->port);
|
|
|
|
// Bind to the listening socket:
|
|
if (bind(masterSocket, (const struct sockaddr *)&listeningAddress, sizeof(listeningAddress)) < 0)
|
|
{
|
|
fprintf(stderr, "Failed to bind socket.\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
if (bind(masterListeningSocket, (const struct sockaddr *)&listeningAddress, sizeof(listeningAddress)) < 0)
|
|
{
|
|
fprintf(stderr, "Failed to bind socket.\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
// Begin listening on the master socket:
|
|
listen(masterSocket, 32);
|
|
|
|
// Create an epoll descriptor to keep track of clients:
|
|
int epollDescriptor = epoll_create(1);
|
|
|
|
// Add the master socket to the epoll set:
|
|
struct epoll_event requestedEvents;
|
|
requestedEvents.events = EPOLLIN | EPOLLET;
|
|
requestedEvents.data.fd = masterSocket;
|
|
epoll_ctl(epollDescriptor, EPOLL_CTL_ADD, masterSocket, &requestedEvents);
|
|
|
|
int recievedEventCount = 0;
|
|
struct epoll_event receivedEvents[32];
|
|
|
|
// Create a set of connection structs to store the current connection information:
|
|
SpacewarConnection connectedClients[32];
|
|
|
|
// Begin the simulation:
|
|
pthread_t physicsThread;
|
|
pthread_create(&physicsThread, NULL, runServerPhysics, currentState);
|
|
|
|
// Manage clients and sending packets back and forth:
|
|
while (true)
|
|
{
|
|
int receivedEventCount = epoll_wait(epollDescriptor, receivedEvents, 32, -1);
|
|
for (int eventIndex = 0; eventIndex < receivedEventCount; eventIndex++)
|
|
{
|
|
// If there's activity on the master socket, there's a new connection:
|
|
if (receivedEvents[eventIndex].data.fd == masterSocket)
|
|
{
|
|
struct sockaddr_in clientAddress;
|
|
socklen_t clientSocketLength = sizeof(struct sockaddr_in);
|
|
int newClientSocket = accept(masterSocket, (struct sockaddr *)&clientAddress,
|
|
&clientSocketLength);
|
|
|
|
// Check that the socket is functional:
|
|
if (newClientSocket < 0)
|
|
{
|
|
fprintf(stderr, "Failed to accept client connection.\n");
|
|
continue;
|
|
}
|
|
|
|
// Register the new client in the epoll set:
|
|
requestedEvents.events = EPOLLIN | EPOLLET;
|
|
requestedEvents.data.fd = newClientSocket;
|
|
epoll_ctl(epollDescriptor, EPOLL_CTL_ADD, newClientSocket, &requestedEvents);
|
|
|
|
for (int index = 0; index < 32; index++)
|
|
{
|
|
if (connectedClients[index].active == false)
|
|
{
|
|
// Configure the new connection:
|
|
connectedClients[index].active = true;
|
|
connectedClients[index].missedPongs = false;
|
|
connectedClients[index].clientSocket = newClientSocket;
|
|
memcpy(&connectedClients[index].clientAddress, &clientAddress,
|
|
sizeof(struct sockaddr_in));
|
|
|
|
// Send the HELLO packet to the player:
|
|
SpacewarMessage helloMessage;
|
|
helloMessage.type = 0;
|
|
helloMessage.content = index;
|
|
send(newClientSocket, &helloMessage, sizeof(SpacewarMessage), 0);
|
|
|
|
// Add the player to the simulation:
|
|
//addPlayer(&connectedClients[index], index, currentState);
|
|
|
|
// Send the SECRET packet to the player:
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
// Otherwise, we've been sent a packet from one of the connected clients:
|
|
else
|
|
{
|
|
SpacewarMessage receivedMessage;
|
|
size_t bytesRead = recv(receivedEvents->data.fd, &receivedMessage,
|
|
sizeof(SpacewarMessage), 0);
|
|
|
|
if (bytesRead == 0)
|
|
{
|
|
// Send a goodbye message:
|
|
SpacewarMessage goodbyeMessage;
|
|
goodbyeMessage.type = 1;
|
|
goodbyeMessage.content = 0;
|
|
send(receivedEvents->data.fd, &goodbyeMessage, sizeof(SpacewarMessage), 0);
|
|
|
|
// Remove the socket from the epoll interest set:
|
|
epoll_ctl(epollDescriptor, EPOLL_CTL_DEL, receivedEvents->data.fd, NULL);
|
|
|
|
// Remove the player from the simulation:
|
|
// removePlayer(&connectedClients[index], currentState);
|
|
|
|
// Clear the player struct:
|
|
// clearPlayer(findPlayerBySocket(connectedClients, 32, receivedEvents->data.fd));
|
|
|
|
// Shutdown the socket:
|
|
shutdown(receivedEvents->data.fd, SHUT_RDWR);
|
|
}
|
|
|
|
else
|
|
{
|
|
switch (receivedMessage.content)
|
|
{
|
|
// Handle message contents:
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
// =======================================================
|
|
// | End of Spacewar-Server.c, copyright notice follows. |
|
|
// =======================================================
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <https://www.gnu.org/licenses/>.
|