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core, network: Add ability to proxy socket packets

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This commit is contained in:
FearlessTobi 2022-07-30 05:58:23 +02:00
parent 035ca99b02
commit f80c7c4cd5
28 changed files with 1039 additions and 537 deletions
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170
src/network/room.cpp
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@ -20,9 +20,7 @@ namespace Network {
class Room::RoomImpl {
public:
// This MAC address is used to generate a 'Nintendo' like Mac address.
const MacAddress NintendoOUI;
std::mt19937 random_gen; ///< Random number generator. Used for GenerateMacAddress
std::mt19937 random_gen; ///< Random number generator. Used for GenerateFakeIPAddress
ENetHost* server = nullptr; ///< Network interface.
@ -35,10 +33,9 @@ public:
std::string password; ///< The password required to connect to this room.
struct Member {
std::string nickname; ///< The nickname of the member.
std::string console_id_hash; ///< A hash of the console ID of the member.
GameInfo game_info; ///< The current game of the member
MacAddress mac_address; ///< The assigned mac address of the member.
std::string nickname; ///< The nickname of the member.
GameInfo game_info; ///< The current game of the member
IPv4Address fake_ip; ///< The assigned fake ip address of the member.
/// Data of the user, often including authenticated forum username.
VerifyUser::UserData user_data;
ENetPeer* peer; ///< The remote peer.
@ -51,8 +48,7 @@ public:
IPBanList ip_ban_list; ///< List of banned IP addresses
mutable std::mutex ban_list_mutex; ///< Mutex for the ban lists
RoomImpl()
: NintendoOUI{0x00, 0x1F, 0x32, 0x00, 0x00, 0x00}, random_gen(std::random_device()()) {}
RoomImpl() : random_gen(std::random_device()()) {}
/// Thread that receives and dispatches network packets
std::unique_ptr<std::thread> room_thread;
@ -101,16 +97,10 @@ public:
bool IsValidNickname(const std::string& nickname) const;
/**
* Returns whether the MAC address is valid, ie. isn't already taken by someone else in the
* Returns whether the fake ip address is valid, ie. isn't already taken by someone else in the
* room.
*/
bool IsValidMacAddress(const MacAddress& address) const;
/**
* Returns whether the console ID (hash) is valid, ie. isn't already taken by someone else in
* the room.
*/
bool IsValidConsoleId(const std::string& console_id_hash) const;
bool IsValidFakeIPAddress(const IPv4Address& address) const;
/**
* Returns whether a user has mod permissions.
@ -128,15 +118,9 @@ public:
void SendNameCollision(ENetPeer* client);
/**
* Sends a ID_ROOM_MAC_COLLISION message telling the client that the MAC is invalid.
* Sends a ID_ROOM_IP_COLLISION message telling the client that the IP is invalid.
*/
void SendMacCollision(ENetPeer* client);
/**
* Sends a IdConsoleIdCollison message telling the client that another member with the same
* console ID exists.
*/
void SendConsoleIdCollision(ENetPeer* client);
void SendIPCollision(ENetPeer* client);
/**
* Sends a ID_ROOM_VERSION_MISMATCH message telling the client that the version is invalid.
@ -152,13 +136,13 @@ public:
* Notifies the member that its connection attempt was successful,
* and it is now part of the room.
*/
void SendJoinSuccess(ENetPeer* client, MacAddress mac_address);
void SendJoinSuccess(ENetPeer* client, IPv4Address fake_ip);
/**
* Notifies the member that its connection attempt was successful,
* and it is now part of the room, and it has been granted mod permissions.
*/
void SendJoinSuccessAsMod(ENetPeer* client, MacAddress mac_address);
void SendJoinSuccessAsMod(ENetPeer* client, IPv4Address fake_ip);
/**
* Sends a IdHostKicked message telling the client that they have been kicked.
@ -210,7 +194,7 @@ public:
* <u32> num_members: the number of currently joined clients
* This is followed by the following three values for each member:
* <String> nickname of that member
* <MacAddress> mac_address of that member
* <IPv4Address> fake_ip of that member
* <String> game_name of that member
*/
void BroadcastRoomInformation();
@ -219,13 +203,13 @@ public:
* Generates a free MAC address to assign to a new client.
* The first 3 bytes are the NintendoOUI 0x00, 0x1F, 0x32
*/
MacAddress GenerateMacAddress();
IPv4Address GenerateFakeIPAddress();
/**
* Broadcasts this packet to all members except the sender.
* @param event The ENet event containing the data
*/
void HandleWifiPacket(const ENetEvent* event);
void HandleProxyPacket(const ENetEvent* event);
/**
* Extracts a chat entry from a received ENet packet and adds it to the chat queue.
@ -250,7 +234,7 @@ public:
void Room::RoomImpl::ServerLoop() {
while (state != State::Closed) {
ENetEvent event;
if (enet_host_service(server, &event, 16) > 0) {
if (enet_host_service(server, &event, 50) > 0) {
switch (event.type) {
case ENET_EVENT_TYPE_RECEIVE:
switch (event.packet->data[0]) {
@ -260,8 +244,8 @@ void Room::RoomImpl::ServerLoop() {
case IdSetGameInfo:
HandleGameNamePacket(&event);
break;
case IdWifiPacket:
HandleWifiPacket(&event);
case IdProxyPacket:
HandleProxyPacket(&event);
break;
case IdChatMessage:
HandleChatPacket(&event);
@ -313,11 +297,8 @@ void Room::RoomImpl::HandleJoinRequest(const ENetEvent* event) {
std::string nickname;
packet.Read(nickname);
std::string console_id_hash;
packet.Read(console_id_hash);
MacAddress preferred_mac;
packet.Read(preferred_mac);
IPv4Address preferred_fake_ip;
packet.Read(preferred_fake_ip);
u32 client_version;
packet.Read(client_version);
@ -338,20 +319,15 @@ void Room::RoomImpl::HandleJoinRequest(const ENetEvent* event) {
return;
}
if (preferred_mac != NoPreferredMac) {
// Verify if the preferred mac is available
if (!IsValidMacAddress(preferred_mac)) {
SendMacCollision(event->peer);
if (preferred_fake_ip != NoPreferredIP) {
// Verify if the preferred fake ip is available
if (!IsValidFakeIPAddress(preferred_fake_ip)) {
SendIPCollision(event->peer);
return;
}
} else {
// Assign a MAC address of this client automatically
preferred_mac = GenerateMacAddress();
}
if (!IsValidConsoleId(console_id_hash)) {
SendConsoleIdCollision(event->peer);
return;
// Assign a fake ip address of this client automatically
preferred_fake_ip = GenerateFakeIPAddress();
}
if (client_version != network_version) {
@ -361,8 +337,7 @@ void Room::RoomImpl::HandleJoinRequest(const ENetEvent* event) {
// At this point the client is ready to be added to the room.
Member member{};
member.mac_address = preferred_mac;
member.console_id_hash = console_id_hash;
member.fake_ip = preferred_fake_ip;
member.nickname = nickname;
member.peer = event->peer;
@ -408,9 +383,9 @@ void Room::RoomImpl::HandleJoinRequest(const ENetEvent* event) {
// Notify everyone that the room information has changed.
BroadcastRoomInformation();
if (HasModPermission(event->peer)) {
SendJoinSuccessAsMod(event->peer, preferred_mac);
SendJoinSuccessAsMod(event->peer, preferred_fake_ip);
} else {
SendJoinSuccess(event->peer, preferred_mac);
SendJoinSuccess(event->peer, preferred_fake_ip);
}
}
@ -575,19 +550,11 @@ bool Room::RoomImpl::IsValidNickname(const std::string& nickname) const {
[&nickname](const auto& member) { return member.nickname != nickname; });
}
bool Room::RoomImpl::IsValidMacAddress(const MacAddress& address) const {
// A MAC address is valid if it is not already taken by anybody else in the room.
bool Room::RoomImpl::IsValidFakeIPAddress(const IPv4Address& address) const {
// An IP address is valid if it is not already taken by anybody else in the room.
std::lock_guard lock(member_mutex);
return std::all_of(members.begin(), members.end(),
[&address](const auto& member) { return member.mac_address != address; });
}
bool Room::RoomImpl::IsValidConsoleId(const std::string& console_id_hash) const {
// A Console ID is valid if it is not already taken by anybody else in the room.
std::lock_guard lock(member_mutex);
return std::all_of(members.begin(), members.end(), [&console_id_hash](const auto& member) {
return member.console_id_hash != console_id_hash;
});
[&address](const auto& member) { return member.fake_ip != address; });
}
bool Room::RoomImpl::HasModPermission(const ENetPeer* client) const {
@ -621,19 +588,9 @@ void Room::RoomImpl::SendNameCollision(ENetPeer* client) {
enet_host_flush(server);
}
void Room::RoomImpl::SendMacCollision(ENetPeer* client) {
void Room::RoomImpl::SendIPCollision(ENetPeer* client) {
Packet packet;
packet.Write(static_cast<u8>(IdMacCollision));
ENetPacket* enet_packet =
enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE);
enet_peer_send(client, 0, enet_packet);
enet_host_flush(server);
}
void Room::RoomImpl::SendConsoleIdCollision(ENetPeer* client) {
Packet packet;
packet.Write(static_cast<u8>(IdConsoleIdCollision));
packet.Write(static_cast<u8>(IdIpCollision));
ENetPacket* enet_packet =
enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE);
@ -672,20 +629,20 @@ void Room::RoomImpl::SendVersionMismatch(ENetPeer* client) {
enet_host_flush(server);
}
void Room::RoomImpl::SendJoinSuccess(ENetPeer* client, MacAddress mac_address) {
void Room::RoomImpl::SendJoinSuccess(ENetPeer* client, IPv4Address fake_ip) {
Packet packet;
packet.Write(static_cast<u8>(IdJoinSuccess));
packet.Write(mac_address);
packet.Write(fake_ip);
ENetPacket* enet_packet =
enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE);
enet_peer_send(client, 0, enet_packet);
enet_host_flush(server);
}
void Room::RoomImpl::SendJoinSuccessAsMod(ENetPeer* client, MacAddress mac_address) {
void Room::RoomImpl::SendJoinSuccessAsMod(ENetPeer* client, IPv4Address fake_ip) {
Packet packet;
packet.Write(static_cast<u8>(IdJoinSuccessAsMod));
packet.Write(mac_address);
packet.Write(fake_ip);
ENetPacket* enet_packet =
enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE);
enet_peer_send(client, 0, enet_packet);
@ -818,7 +775,7 @@ void Room::RoomImpl::BroadcastRoomInformation() {
std::lock_guard lock(member_mutex);
for (const auto& member : members) {
packet.Write(member.nickname);
packet.Write(member.mac_address);
packet.Write(member.fake_ip);
packet.Write(member.game_info.name);
packet.Write(member.game_info.id);
packet.Write(member.user_data.username);
@ -833,34 +790,43 @@ void Room::RoomImpl::BroadcastRoomInformation() {
enet_host_flush(server);
}
MacAddress Room::RoomImpl::GenerateMacAddress() {
MacAddress result_mac =
NintendoOUI; // The first three bytes of each MAC address will be the NintendoOUI
std::uniform_int_distribution<> dis(0x00, 0xFF); // Random byte between 0 and 0xFF
IPv4Address Room::RoomImpl::GenerateFakeIPAddress() {
IPv4Address result_ip{192, 168, 0, 0};
std::uniform_int_distribution<> dis(0x01, 0xFE); // Random byte between 1 and 0xFE
do {
for (std::size_t i = 3; i < result_mac.size(); ++i) {
result_mac[i] = dis(random_gen);
for (std::size_t i = 2; i < result_ip.size(); ++i) {
result_ip[i] = dis(random_gen);
}
} while (!IsValidMacAddress(result_mac));
return result_mac;
} while (!IsValidFakeIPAddress(result_ip));
return result_ip;
}
void Room::RoomImpl::HandleWifiPacket(const ENetEvent* event) {
void Room::RoomImpl::HandleProxyPacket(const ENetEvent* event) {
Packet in_packet;
in_packet.Append(event->packet->data, event->packet->dataLength);
in_packet.IgnoreBytes(sizeof(u8)); // Message type
in_packet.IgnoreBytes(sizeof(u8)); // WifiPacket Type
in_packet.IgnoreBytes(sizeof(u8)); // WifiPacket Channel
in_packet.IgnoreBytes(sizeof(MacAddress)); // WifiPacket Transmitter Address
MacAddress destination_address;
in_packet.Read(destination_address);
in_packet.IgnoreBytes(sizeof(u8)); // Message type
in_packet.IgnoreBytes(sizeof(u8)); // Domain
in_packet.IgnoreBytes(sizeof(IPv4Address)); // IP
in_packet.IgnoreBytes(sizeof(u16)); // Port
in_packet.IgnoreBytes(sizeof(u8)); // Domain
IPv4Address remote_ip;
in_packet.Read(remote_ip); // IP
in_packet.IgnoreBytes(sizeof(u16)); // Port
in_packet.IgnoreBytes(sizeof(u8)); // Protocol
bool broadcast;
in_packet.Read(broadcast); // Broadcast
Packet out_packet;
out_packet.Append(event->packet->data, event->packet->dataLength);
ENetPacket* enet_packet = enet_packet_create(out_packet.GetData(), out_packet.GetDataSize(),
ENET_PACKET_FLAG_RELIABLE);
if (destination_address == BroadcastMac) { // Send the data to everyone except the sender
const auto& destination_address = remote_ip;
if (broadcast) { // Send the data to everyone except the sender
std::lock_guard lock(member_mutex);
bool sent_packet = false;
for (const auto& member : members) {
@ -877,16 +843,16 @@ void Room::RoomImpl::HandleWifiPacket(const ENetEvent* event) {
std::lock_guard lock(member_mutex);
auto member = std::find_if(members.begin(), members.end(),
[destination_address](const Member& member_entry) -> bool {
return member_entry.mac_address == destination_address;
return member_entry.fake_ip == destination_address;
});
if (member != members.end()) {
enet_peer_send(member->peer, 0, enet_packet);
} else {
LOG_ERROR(Network,
"Attempting to send to unknown MAC address: "
"{:02X}:{:02X}:{:02X}:{:02X}:{:02X}:{:02X}",
"Attempting to send to unknown IP address: "
"{}.{}.{}.{}",
destination_address[0], destination_address[1], destination_address[2],
destination_address[3], destination_address[4], destination_address[5]);
destination_address[3]);
enet_packet_destroy(enet_packet);
}
}
@ -1073,7 +1039,7 @@ std::vector<Member> Room::GetRoomMemberList() const {
member.username = member_impl.user_data.username;
member.display_name = member_impl.user_data.display_name;
member.avatar_url = member_impl.user_data.avatar_url;
member.mac_address = member_impl.mac_address;
member.fake_ip = member_impl.fake_ip;
member.game = member_impl.game_info;
member_list.push_back(member);
}