/* * ENet reliable UDP networking library * Copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #ifndef ENET_H #define ENET_H #include #include #include #include #ifdef ENET_LZ4 #include "lz4/lz4.h" #endif #define ENET_VERSION_MAJOR 2 #define ENET_VERSION_MINOR 2 #define ENET_VERSION_PATCH 1 #define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch)) #define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF) #define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF) #define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF) #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH) #define ENET_TIME_OVERFLOW 86400000 #define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW) #define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW) #define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b)) #define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b)) #define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b)) #define ENET_MAX(x, y) ((x) > (y) ? (x) : (y)) #define ENET_MIN(x, y) ((x) < (y) ? (x) : (y)) #define ENET_SRTT_INITIAL 1.0 #define ENET_SRTT_PARA_G 0.125 // =======================================================================// // ! // ! System differences // ! // =======================================================================// #ifdef _WIN32 #ifdef __MINGW32__ #include "mingw/inet_ntop.c" #include "mingw/inet_pton.c" #endif #if defined(_MSC_VER) && defined(ENET_IMPLEMENTATION) #pragma warning(disable: 4018) /* signed/unsigned mismatch */ #pragma warning(disable: 4146) /* unary minus operator applied to unsigned type */ #pragma warning(disable: 4244) /* 64bit to 32bit int */ #pragma warning(disable: 4267) /* size_t to int conversion */ #endif #ifndef ENET_NO_PRAGMA_LINK #pragma comment(lib, "ws2_32.lib") #pragma comment(lib, "winmm.lib") #endif #if _MSC_VER #define _WINSOCK_DEPRECATED_NO_WARNINGS #endif #if _MSC_VER >= 1910 /* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit versions of _InterlockedExchange[operation], only InterlockedExchange[operation] (without leading underscore), so we have to distinguish between compiler versions */ #define NOT_UNDERSCORED_INTERLOCKED_EXCHANGE #endif #ifdef __GNUC__ #if (_WIN32_WINNT < 0x0501) #undef _WIN32_WINNT #define _WIN32_WINNT 0x0501 #endif #endif #include #include #include #include #if defined(_WIN32) && defined(_MSC_VER) #if _MSC_VER < 1900 typedef struct timespec { long tv_sec; long tv_nsec; }; #endif #define CLOCK_MONOTONIC 0 #endif typedef SOCKET ENetSocket; #define ENET_SOCKET_NULL INVALID_SOCKET typedef struct { size_t dataLength; void* data; } ENetBuffer; #define ENET_CALLBACK __cdecl #ifdef ENET_DLL #ifdef ENET_IMPLEMENTATION #define ENET_API __declspec(dllexport) #else #define ENET_API __declspec(dllimport) #endif #else #define ENET_API extern #endif #else #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef __APPLE__ #include #include #include #endif #ifndef MSG_NOSIGNAL #define MSG_NOSIGNAL 0 #endif #ifdef MSG_MAXIOVLEN #define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN #endif typedef int ENetSocket; #define ENET_SOCKET_NULL -1 typedef struct { void* data; size_t dataLength; } ENetBuffer; #define ENET_CALLBACK #define ENET_API extern #endif #ifndef ENET_BUFFER_MAXIMUM #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS) #endif #define ENET_HOST_ANY in6addr_any #define ENET_PORT_ANY 0 #define ENET_HOST_SIZE 1025 #define ENET_HOST_BROADCAST 0xFFFFFFFFU #define ENET_HOST_TO_NET_16(value) (htons(value)) #define ENET_HOST_TO_NET_32(value) (htonl(value)) #define ENET_NET_TO_HOST_16(value) (ntohs(value)) #define ENET_NET_TO_HOST_32(value) (ntohl(value)) #ifdef __cplusplus extern "C" { #endif // =======================================================================// // ! // ! Basic stuff // ! // =======================================================================// typedef uint8_t enet_uint8; typedef uint16_t enet_uint16; typedef uint32_t enet_uint32; typedef uint64_t enet_uint64; typedef enet_uint32 ENetVersion; typedef fd_set ENetSocketSet; typedef struct _ENetCallbacks { void* (ENET_CALLBACK *malloc)(size_t size); void (ENET_CALLBACK *free)(void* memory); void (ENET_CALLBACK *noMemory)(void); } ENetCallbacks; extern void* enet_malloc(size_t); extern void enet_free(void*); // =======================================================================// // ! // ! List // ! // =======================================================================// typedef struct _ENetListNode { struct _ENetListNode* next; struct _ENetListNode* previous; } ENetListNode; typedef ENetListNode* ENetListIterator; typedef struct _ENetList { ENetListNode sentinel; } ENetList; extern ENetListIterator enet_list_insert(ENetListIterator, void*); extern ENetListIterator enet_list_move(ENetListIterator, void*, void*); extern void* enet_list_remove(ENetListIterator); extern void enet_list_clear(ENetList*); extern size_t enet_list_size(ENetList*); #define enet_list_begin(list) ((list)->sentinel.next) #define enet_list_end(list) (&(list)->sentinel) #define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list)) #define enet_list_next(iterator) ((iterator)->next) #define enet_list_previous(iterator) ((iterator)->previous) #define enet_list_front(list) ((void*)(list)->sentinel.next) #define enet_list_back(list) ((void*)(list)->sentinel.previous) // =======================================================================// // ! // ! Protocol // ! // =======================================================================// enum { ENET_PROTOCOL_MINIMUM_MTU = 576, ENET_PROTOCOL_MAXIMUM_MTU = 4096, ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32, ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096, ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536, ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1, ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255, ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF, ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024 }; typedef enum _ENetProtocolCommand { ENET_PROTOCOL_COMMAND_NONE = 0, ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1, ENET_PROTOCOL_COMMAND_CONNECT = 2, ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3, ENET_PROTOCOL_COMMAND_DISCONNECT = 4, ENET_PROTOCOL_COMMAND_PING = 5, ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6, ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7, ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8, ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9, ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10, ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11, ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12, ENET_PROTOCOL_COMMAND_COUNT = 13, ENET_PROTOCOL_COMMAND_MASK = 0x0F } ENetProtocolCommand; typedef enum _ENetProtocolFlag { ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7), ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6), ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14), ENET_PROTOCOL_HEADER_FLAG_COMPRESSED = (1 << 15), ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME | ENET_PROTOCOL_HEADER_FLAG_COMPRESSED, ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12), ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12 } ENetProtocolFlag; #ifdef _MSC_VER #pragma pack(push, 1) #define ENET_PACKED #elif defined(__GNUC__) || defined(__clang__) #define ENET_PACKED __attribute__ ((packed)) #else #define ENET_PACKED #endif typedef struct _ENetProtocolHeader { enet_uint16 peerID; enet_uint16 sentTime; } ENET_PACKED ENetProtocolHeader; typedef struct _ENetProtocolCommandHeader { enet_uint8 command; enet_uint8 channelID; enet_uint16 reliableSequenceNumber; } ENET_PACKED ENetProtocolCommandHeader; typedef struct _ENetProtocolAcknowledge { ENetProtocolCommandHeader header; enet_uint16 receivedReliableSequenceNumber; enet_uint16 receivedSentTime; } ENET_PACKED ENetProtocolAcknowledge; typedef struct _ENetProtocolConnect { ENetProtocolCommandHeader header; enet_uint16 outgoingPeerID; enet_uint8 incomingSessionID; enet_uint8 outgoingSessionID; enet_uint32 mtu; enet_uint32 windowSize; enet_uint32 channelCount; enet_uint32 incomingBandwidth; enet_uint32 outgoingBandwidth; enet_uint32 packetThrottleInterval; enet_uint32 packetThrottleAcceleration; enet_uint32 packetThrottleDeceleration; enet_uint32 connectID; enet_uint32 data; } ENET_PACKED ENetProtocolConnect; typedef struct _ENetProtocolVerifyConnect { ENetProtocolCommandHeader header; enet_uint16 outgoingPeerID; enet_uint8 incomingSessionID; enet_uint8 outgoingSessionID; enet_uint32 mtu; enet_uint32 windowSize; enet_uint32 channelCount; enet_uint32 incomingBandwidth; enet_uint32 outgoingBandwidth; enet_uint32 packetThrottleInterval; enet_uint32 packetThrottleAcceleration; enet_uint32 packetThrottleDeceleration; enet_uint32 connectID; } ENET_PACKED ENetProtocolVerifyConnect; typedef struct _ENetProtocolBandwidthLimit { ENetProtocolCommandHeader header; enet_uint32 incomingBandwidth; enet_uint32 outgoingBandwidth; } ENET_PACKED ENetProtocolBandwidthLimit; typedef struct _ENetProtocolThrottleConfigure { ENetProtocolCommandHeader header; enet_uint32 packetThrottleInterval; enet_uint32 packetThrottleAcceleration; enet_uint32 packetThrottleDeceleration; } ENET_PACKED ENetProtocolThrottleConfigure; typedef struct _ENetProtocolDisconnect { ENetProtocolCommandHeader header; enet_uint32 data; } ENET_PACKED ENetProtocolDisconnect; typedef struct _ENetProtocolPing { ENetProtocolCommandHeader header; } ENET_PACKED ENetProtocolPing; typedef struct _ENetProtocolSendReliable { ENetProtocolCommandHeader header; enet_uint16 dataLength; } ENET_PACKED ENetProtocolSendReliable; typedef struct _ENetProtocolSendUnreliable { ENetProtocolCommandHeader header; enet_uint16 unreliableSequenceNumber; enet_uint16 dataLength; } ENET_PACKED ENetProtocolSendUnreliable; typedef struct _ENetProtocolSendUnsequenced { ENetProtocolCommandHeader header; enet_uint16 unsequencedGroup; enet_uint16 dataLength; } ENET_PACKED ENetProtocolSendUnsequenced; typedef struct _ENetProtocolSendFragment { ENetProtocolCommandHeader header; enet_uint16 startSequenceNumber; enet_uint16 dataLength; enet_uint32 fragmentCount; enet_uint32 fragmentNumber; enet_uint32 totalLength; enet_uint32 fragmentOffset; } ENET_PACKED ENetProtocolSendFragment; typedef union _ENetProtocol { ENetProtocolCommandHeader header; ENetProtocolAcknowledge acknowledge; ENetProtocolConnect connect; ENetProtocolVerifyConnect verifyConnect; ENetProtocolDisconnect disconnect; ENetProtocolPing ping; ENetProtocolSendReliable sendReliable; ENetProtocolSendUnreliable sendUnreliable; ENetProtocolSendUnsequenced sendUnsequenced; ENetProtocolSendFragment sendFragment; ENetProtocolBandwidthLimit bandwidthLimit; ENetProtocolThrottleConfigure throttleConfigure; } ENET_PACKED ENetProtocol; #ifdef _MSC_VER #pragma pack(pop) #endif // =======================================================================// // ! // ! General ENet structs/enums // ! // =======================================================================// typedef enum _ENetSocketType { ENET_SOCKET_TYPE_STREAM = 1, ENET_SOCKET_TYPE_DATAGRAM = 2 } ENetSocketType; typedef enum _ENetSocketWait { ENET_SOCKET_WAIT_NONE = 0, ENET_SOCKET_WAIT_SEND = (1 << 0), ENET_SOCKET_WAIT_RECEIVE = (1 << 1), ENET_SOCKET_WAIT_INTERRUPT = (1 << 2) } ENetSocketWait; typedef enum _ENetSocketOption { ENET_SOCKOPT_NONBLOCK = 1, ENET_SOCKOPT_BROADCAST = 2, ENET_SOCKOPT_RCVBUF = 3, ENET_SOCKOPT_SNDBUF = 4, ENET_SOCKOPT_REUSEADDR = 5, ENET_SOCKOPT_RCVTIMEO = 6, ENET_SOCKOPT_SNDTIMEO = 7, ENET_SOCKOPT_ERROR = 8, ENET_SOCKOPT_NODELAY = 9, ENET_SOCKOPT_IPV6_V6ONLY = 10 } ENetSocketOption; typedef enum _ENetSocketShutdown { ENET_SOCKET_SHUTDOWN_READ = 0, ENET_SOCKET_SHUTDOWN_WRITE = 1, ENET_SOCKET_SHUTDOWN_READ_WRITE = 2 } ENetSocketShutdown; typedef struct _ENetAddress { struct in6_addr host; enet_uint16 port; enet_uint16 scope; } ENetAddress; #define in6_equal(in6_addr_a, in6_addr_b) (memcmp(&in6_addr_a, &in6_addr_b, sizeof(struct in6_addr)) == 0) typedef enum _ENetPacketFlag { ENET_PACKET_FLAG_NONE = 0, ENET_PACKET_FLAG_RELIABLE = (1 << 0), ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1), ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2), ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT = (1 << 3), ENET_PACKET_FLAG_SENT = (1 << 8) } ENetPacketFlag; typedef void (ENET_CALLBACK *ENetPacketFreeCallback)(void*); typedef struct _ENetPacket { enet_uint32 flags; enet_uint32 dataLength; enet_uint8* data; ENetPacketFreeCallback freeCallback; enet_uint32 referenceCount; } ENetPacket; typedef struct _ENetAcknowledgement { ENetListNode acknowledgementList; enet_uint32 sentTime; ENetProtocol command; } ENetAcknowledgement; typedef struct _ENetOutgoingCommand { ENetListNode outgoingCommandList; enet_uint16 reliableSequenceNumber; enet_uint16 unreliableSequenceNumber; enet_uint32 sentTime; enet_uint32 roundTripTimeout; enet_uint32 roundTripTimeoutLimit; enet_uint32 fragmentOffset; enet_uint16 fragmentLength; enet_uint16 sendAttempts; ENetProtocol command; ENetPacket* packet; } ENetOutgoingCommand; typedef struct _ENetIncomingCommand { ENetListNode incomingCommandList; enet_uint16 reliableSequenceNumber; enet_uint16 unreliableSequenceNumber; ENetProtocol command; enet_uint32 fragmentCount; enet_uint32 fragmentsRemaining; enet_uint32* fragments; ENetPacket* packet; } ENetIncomingCommand; typedef enum _ENetPeerState { ENET_PEER_STATE_DISCONNECTED = 0, ENET_PEER_STATE_CONNECTING = 1, ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2, ENET_PEER_STATE_CONNECTION_PENDING = 3, ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4, ENET_PEER_STATE_CONNECTED = 5, ENET_PEER_STATE_DISCONNECT_LATER = 6, ENET_PEER_STATE_DISCONNECTING = 7, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8, ENET_PEER_STATE_ZOMBIE = 9 } ENetPeerState; enum { ENET_HOST_RECEIVE_BUFFER_SIZE = 256 * 1024, ENET_HOST_SEND_BUFFER_SIZE = 256 * 1024, ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000, ENET_HOST_DEFAULT_MTU = 1400, ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024, ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024, ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500, ENET_PEER_DEFAULT_PACKET_THROTTLE = 32, ENET_PEER_PACKET_THROTTLE_SCALE = 32, ENET_PEER_PACKET_THROTTLE_COUNTER = 7, ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2, ENET_PEER_PACKET_THROTTLE_DECELERATION = 2, ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000, ENET_PEER_PACKET_LOSS_SCALE = (1 << 16), ENET_PEER_PACKET_LOSS_INTERVAL = 10000, ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024, ENET_PEER_TIMEOUT_LIMIT = 32, ENET_PEER_TIMEOUT_MINIMUM = 5000, ENET_PEER_TIMEOUT_MAXIMUM = 30000, ENET_PEER_PING_INTERVAL = 500, ENET_PEER_UNSEQUENCED_WINDOWS = 64, ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024, ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32, ENET_PEER_RELIABLE_WINDOWS = 16, ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000, ENET_PEER_FREE_RELIABLE_WINDOWS = 8 }; typedef struct _ENetChannel { enet_uint16 outgoingReliableSequenceNumber; enet_uint16 outgoingUnreliableSequenceNumber; enet_uint16 usedReliableWindows; enet_uint16 reliableWindows[ENET_PEER_RELIABLE_WINDOWS]; enet_uint16 incomingReliableSequenceNumber; enet_uint16 incomingUnreliableSequenceNumber; ENetList incomingReliableCommands; ENetList incomingUnreliableCommands; } ENetChannel; typedef struct _ENetPeer { ENetListNode dispatchList; struct _ENetHost* host; enet_uint16 outgoingPeerID; enet_uint16 incomingPeerID; enet_uint32 connectID; enet_uint8 outgoingSessionID; enet_uint8 incomingSessionID; ENetAddress address; void* data; ENetPeerState state; ENetChannel* channels; size_t channelCount; enet_uint32 incomingBandwidth; enet_uint32 outgoingBandwidth; enet_uint32 incomingBandwidthThrottleEpoch; enet_uint32 outgoingBandwidthThrottleEpoch; enet_uint32 incomingDataTotal; enet_uint64 totalDataReceived; enet_uint32 outgoingDataTotal; enet_uint64 totalDataSent; enet_uint32 lastSendTime; enet_uint32 lastReceiveTime; enet_uint32 nextTimeout; enet_uint32 earliestTimeout; enet_uint32 packetLossEpoch; enet_uint32 packetsSent; enet_uint64 totalPacketsSent; enet_uint32 packetsLost; enet_uint64 totalPacketsLost; enet_uint32 packetLoss; enet_uint32 packetLossVariance; enet_uint32 packetThrottle; enet_uint32 packetThrottleLimit; enet_uint32 packetThrottleCounter; enet_uint32 packetThrottleEpoch; enet_uint32 packetThrottleAcceleration; enet_uint32 packetThrottleDeceleration; enet_uint32 packetThrottleInterval; enet_uint32 pingInterval; enet_uint32 timeoutLimit; enet_uint32 timeoutMinimum; enet_uint32 timeoutMaximum; enet_uint32 smoothedRoundTripTime; enet_uint32 lastRoundTripTime; enet_uint32 lowestRoundTripTime; enet_uint32 lastRoundTripTimeVariance; enet_uint32 highestRoundTripTimeVariance; enet_uint32 roundTripTime; enet_uint32 roundTripTimeVariance; enet_uint32 mtu; enet_uint32 windowSize; enet_uint32 reliableDataInTransit; enet_uint16 outgoingReliableSequenceNumber; ENetList acknowledgements; ENetList sentReliableCommands; ENetList sentUnreliableCommands; ENetList outgoingReliableCommands; ENetList outgoingUnreliableCommands; ENetList dispatchedCommands; int needsDispatch; enet_uint16 incomingUnsequencedGroup; enet_uint16 outgoingUnsequencedGroup; enet_uint32 unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32]; enet_uint32 eventData; size_t totalWaitingData; } ENetPeer; typedef enet_uint32 (ENET_CALLBACK *ENetChecksumCallback)(const ENetBuffer* buffers, size_t bufferCount); typedef int (ENET_CALLBACK *ENetInterceptCallback)(struct _ENetHost* host, void* event); typedef struct _ENetHost { ENetSocket socket; ENetAddress address; enet_uint32 incomingBandwidth; enet_uint32 outgoingBandwidth; enet_uint32 bandwidthThrottleEpoch; enet_uint32 mtu; enet_uint32 randomSeed; int recalculateBandwidthLimits; enet_uint8 preventConnections; ENetPeer* peers; size_t peerCount; size_t channelLimit; enet_uint32 serviceTime; ENetList dispatchQueue; int continueSending; size_t packetSize; enet_uint16 headerFlags; enet_uint32 totalSentData; enet_uint32 totalSentPackets; enet_uint32 totalReceivedData; enet_uint32 totalReceivedPackets; ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS]; size_t commandCount; ENetBuffer buffers[ENET_BUFFER_MAXIMUM]; size_t bufferCount; enet_uint8 compression; char* compressionBuffer; size_t compressionBufferSize; ENetChecksumCallback checksumCallback; enet_uint8 packetData[2][ENET_PROTOCOL_MAXIMUM_MTU]; ENetAddress receivedAddress; enet_uint8* receivedData; size_t receivedDataLength; ENetInterceptCallback interceptCallback; size_t connectedPeers; size_t bandwidthLimitedPeers; size_t duplicatePeers; size_t maximumPacketSize; size_t maximumWaitingData; } ENetHost; typedef enum _ENetEventType { ENET_EVENT_TYPE_NONE = 0, ENET_EVENT_TYPE_CONNECT = 1, ENET_EVENT_TYPE_DISCONNECT = 2, ENET_EVENT_TYPE_RECEIVE = 3, ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4 } ENetEventType; typedef struct _ENetEvent { ENetEventType type; ENetPeer* peer; enet_uint8 channelID; enet_uint32 data; ENetPacket* packet; } ENetEvent; // =======================================================================// // ! // ! Public API // ! // =======================================================================// ENET_API int enet_initialize(void); ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*); ENET_API void enet_deinitialize(void); ENET_API ENetVersion enet_linked_version(void); ENET_API enet_uint32 enet_time_get(void); ENET_API ENetSocket enet_socket_create(ENetSocketType); ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*); ENET_API int enet_socket_get_address(ENetSocket, ENetAddress*); ENET_API int enet_socket_listen(ENetSocket, int); ENET_API ENetSocket enet_socket_accept(ENetSocket, ENetAddress*); ENET_API int enet_socket_connect(ENetSocket, const ENetAddress*); ENET_API int enet_socket_send(ENetSocket, const ENetAddress*, const ENetBuffer*, size_t); ENET_API int enet_socket_receive(ENetSocket, ENetAddress*, ENetBuffer*, size_t); ENET_API int enet_socket_wait(ENetSocket, enet_uint32*, enet_uint64); ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int); ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*); ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown); ENET_API void enet_socket_destroy(ENetSocket); ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, enet_uint32); ENET_API int enet_address_set_host_ip(ENetAddress*, const char*); ENET_API int enet_address_set_host(ENetAddress*, const char*); ENET_API int enet_address_get_host_ip(const ENetAddress*, char*, size_t); ENET_API int enet_address_get_host(const ENetAddress*, char*, size_t); ENET_API ENetPacket* enet_packet_create(const void*, size_t, enet_uint32); ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, enet_uint32); ENET_API void enet_packet_destroy(ENetPacket*); ENET_API enet_uint32 enet_crc32(const ENetBuffer*, size_t); ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, enet_uint32, enet_uint32); ENET_API void enet_host_destroy(ENetHost*); ENET_API void enet_host_enable_compression(ENetHost*); ENET_API void enet_host_prevent_connections(ENetHost*, enet_uint8); ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, enet_uint32); ENET_API int enet_host_check_events(ENetHost*, ENetEvent*); ENET_API int enet_host_service(ENetHost*, ENetEvent*, enet_uint32); ENET_API void enet_host_flush(ENetHost*); ENET_API void enet_host_broadcast(ENetHost*, enet_uint8, ENetPacket*); ENET_API void enet_host_broadcast_selective(ENetHost*, enet_uint8, ENetPacket*, ENetPeer**, size_t); ENET_API void enet_host_channel_limit(ENetHost*, size_t); ENET_API void enet_host_bandwidth_limit(ENetHost*, enet_uint32, enet_uint32); ENET_API int enet_peer_send(ENetPeer*, enet_uint8, ENetPacket*); ENET_API ENetPacket* enet_peer_receive(ENetPeer*, enet_uint8* channelID); ENET_API void enet_peer_ping(ENetPeer*); ENET_API void enet_peer_ping_interval(ENetPeer*, enet_uint32); ENET_API void enet_peer_timeout(ENetPeer*, enet_uint32, enet_uint32, enet_uint32); ENET_API void enet_peer_reset(ENetPeer*); ENET_API void enet_peer_disconnect(ENetPeer*, enet_uint32); ENET_API void enet_peer_disconnect_now(ENetPeer*, enet_uint32); ENET_API void enet_peer_disconnect_later(ENetPeer*, enet_uint32); ENET_API void enet_peer_throttle_configure(ENetPeer*, enet_uint32, enet_uint32, enet_uint32); /* Extended API for easier binding in other programming languages */ ENET_API void* enet_packet_get_data(const ENetPacket*); ENET_API int enet_packet_get_length(const ENetPacket*); ENET_API void enet_packet_set_free_callback(ENetPacket*, const void*); ENET_API int enet_packet_check_references(const ENetPacket*); ENET_API void enet_packet_dispose(ENetPacket*); ENET_API enet_uint32 enet_host_get_peers_count(const ENetHost*); ENET_API enet_uint32 enet_host_get_packets_sent(const ENetHost*); ENET_API enet_uint32 enet_host_get_packets_received(const ENetHost*); ENET_API enet_uint32 enet_host_get_bytes_sent(const ENetHost*); ENET_API enet_uint32 enet_host_get_bytes_received(const ENetHost*); ENET_API enet_uint32 enet_peer_get_id(const ENetPeer*); ENET_API int enet_peer_get_ip(const ENetPeer*, char* ip, size_t ipLength); ENET_API enet_uint16 enet_peer_get_port(const ENetPeer*); ENET_API enet_uint32 enet_peer_get_mtu(const ENetPeer*); ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*); ENET_API enet_uint32 enet_peer_get_rtt(const ENetPeer*); ENET_API enet_uint32 enet_peer_get_lastsendtime(const ENetPeer*); ENET_API enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer*); ENET_API enet_uint64 enet_peer_get_packets_sent(const ENetPeer*); ENET_API enet_uint64 enet_peer_get_packets_lost(const ENetPeer*); ENET_API enet_uint64 enet_peer_get_bytes_sent(const ENetPeer*); ENET_API enet_uint64 enet_peer_get_bytes_received(const ENetPeer*); ENET_API void* enet_peer_get_data(const ENetPeer*); ENET_API void enet_peer_set_data(ENetPeer*, const void*); // =======================================================================// // ! // ! Private API // ! // =======================================================================// extern void enet_host_bandwidth_throttle(ENetHost*); extern enet_uint64 enet_host_random_seed(void); extern int enet_peer_throttle(ENetPeer*, enet_uint32); extern void enet_peer_reset_queues(ENetPeer*); extern void enet_peer_setup_outgoing_command(ENetPeer*, ENetOutgoingCommand*); extern ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer*, const ENetProtocol*, ENetPacket*, enet_uint32, enet_uint16); extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, enet_uint32, enet_uint32); extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, enet_uint16); extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*); extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*); extern void enet_peer_on_connect(ENetPeer*); extern void enet_peer_on_disconnect(ENetPeer*); extern size_t enet_protocol_command_size(enet_uint8); #ifdef __cplusplus } #endif #if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE) #define ENET_IMPLEMENTATION_DONE 1 #ifdef __cplusplus extern "C" { #endif // =======================================================================// // ! // ! Atomics // ! // =======================================================================// #ifdef _MSC_VER #define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1]) #define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8) #define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable))) __inline int64_t enet_at_atomic_read(char* ptr, size_t size) { switch (size) { case 1: return _InterlockedExchangeAdd8((volatile char*)ptr, 0); case 2: return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0); case 4: #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE return InterlockedExchangeAdd((volatile LONG*)ptr, 0); #else return _InterlockedExchangeAdd((volatile LONG*)ptr, 0); #endif case 8: #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0); #else return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0); #endif default: return 0x0; } } __inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) { switch (size) { case 1: return _InterlockedExchange8((volatile char*)ptr, (char)value); case 2: return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value); case 4: #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE return InterlockedExchange((volatile LONG*)ptr, (LONG)value); #else return _InterlockedExchange((volatile LONG*)ptr, (LONG)value); #endif case 8: #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value); #else return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value); #endif default: return 0x0; } } __inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) { switch (size) { case 1: return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val); case 2: return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val); case 4: #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val); #else return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val); #endif case 8: #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val); #else return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val); #endif default: return 0x0; } } __inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) { switch (data_size) { case 1: return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta); case 2: return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta); case 4: #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta); #else return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta); #endif case 8: #ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta); #else return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta); #endif default: return 0x0; } } #define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable)) #define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable)) #define ENET_ATOMIC_CAS(variable, old_value, new_val) enet_at_atomic_cas((char*)(variable), (int64_t)(new_val), (int64_t)(old_value), ENET_ATOMIC_SIZEOF(variable)) #define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable)) #define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable)) #define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable)) #define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable)) #elif defined(__GNUC__) || defined(__clang__) #if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)) #define AT_HAVE_ATOMICS #endif /* We want to use __atomic built-ins if possible because the __sync primitives are deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on uninitialized memory without running into undefined behavior, and because the __atomic versions generate more efficient code since we don't need to rely on CAS when we don't actually want it. Note that we use acquire-release memory order (like mutexes do). We could use sequentially consistent memory order but that has lower performance and is almost always unneeded. */ #ifdef AT_HAVE_ATOMICS #define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE) #define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE) #ifndef typeof #define typeof __typeof__ #endif /* clang_analyzer doesn't know that CAS writes to memory so it complains about potentially lost data. Replace the code with the equivalent non-sync code. */ #ifdef __clang_analyzer__ #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \ ({ \ typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr)); \ if (ATOMIC_CAS_old_actual_ == (old_value)) \ *(ptr) = new_value; \ ENET_ATOMIC_CAS_old_actual_; \ }) #else /* Could use __auto_type instead of typeof but that shouldn't work in C++. The ({ }) syntax is a GCC extension called statement expression. It lets us return a value out of the macro. TODO We should return bool here instead of the old value to avoid the ABA problem. */ #define ENET_ATOMIC_CAS(ptr, old_value, new_value) \ ({ \ typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value); \ __atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false, \ __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE); \ ENET_ATOMIC_CAS_expected_; \ }) #endif #define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL) #define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL) #define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL) #define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL) #else #define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0) #define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val)) #define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val)) #define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1) #define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1) #define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1) #define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1) #endif #undef AT_HAVE_ATOMICS #endif // =======================================================================// // ! // ! Globals // ! // =======================================================================// ENetVersion enet_linked_version(void) { return ENET_VERSION; } // =======================================================================// // ! // ! Callbacks // ! // =======================================================================// static ENetCallbacks callbacks = { malloc, free, abort }; int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks* inits) { if (version < ENET_VERSION_CREATE(1, 3, 0)) return -1; if (inits->malloc != NULL || inits->free != NULL) { if (inits->malloc == NULL || inits->free == NULL) return -1; callbacks.malloc = inits->malloc; callbacks.free = inits->free; } if (inits->noMemory != NULL) callbacks.noMemory = inits->noMemory; return enet_initialize(); } void* enet_malloc(size_t size) { void* memory = callbacks.malloc(size); if (memory == NULL) callbacks.noMemory(); return memory; } void enet_free(void* memory) { callbacks.free(memory); } // =======================================================================// // ! // ! List // ! // =======================================================================// void enet_list_clear(ENetList* list) { list->sentinel.next = &list->sentinel; list->sentinel.previous = &list->sentinel; } ENetListIterator enet_list_insert(ENetListIterator position, void* data) { ENetListIterator result = (ENetListIterator)data; result->previous = position->previous; result->next = position; result->previous->next = result; position->previous = result; return result; } void* enet_list_remove(ENetListIterator position) { position->previous->next = position->next; position->next->previous = position->previous; return position; } ENetListIterator enet_list_move(ENetListIterator position, void* dataFirst, void* dataLast) { ENetListIterator first = (ENetListIterator)dataFirst; ENetListIterator last = (ENetListIterator)dataLast; first->previous->next = last->next; last->next->previous = first->previous; first->previous = position->previous; last->next = position; first->previous->next = first; position->previous = last; return first; } size_t enet_list_size(ENetList* list) { size_t size = 0; ENetListIterator position; for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position)) { ++size; } return size; } // =======================================================================// // ! // ! Packet // ! // =======================================================================// ENetPacket* enet_packet_create(const void* data, size_t dataLength, enet_uint32 flags) { ENetPacket* packet; if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) { packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket)); if (packet == NULL) return NULL; packet->data = (enet_uint8*)data; } else { packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength); if (packet == NULL) return NULL; packet->data = (enet_uint8*)packet + sizeof(ENetPacket); if (data != NULL) memcpy(packet->data, data, dataLength); } packet->referenceCount = 0; packet->flags = flags; packet->dataLength = dataLength; packet->freeCallback = NULL; return packet; } ENetPacket* enet_packet_create_offset(const void* data, size_t dataLength, size_t dataOffset, enet_uint32 flags) { ENetPacket* packet; if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) { packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket)); if (packet == NULL) return NULL; packet->data = (enet_uint8*)data; } else { packet = (ENetPacket*)enet_malloc(sizeof(ENetPacket) + dataLength - dataOffset); if (packet == NULL) return NULL; packet->data = (enet_uint8*)packet + sizeof(ENetPacket); if (data != NULL) memcpy(packet->data, (char*)data + dataOffset, dataLength - dataOffset); } packet->referenceCount = 0; packet->flags = flags; packet->dataLength = dataLength - dataOffset; packet->freeCallback = NULL; return packet; } void enet_packet_destroy(ENetPacket* packet) { if (packet == NULL) return; if (packet->freeCallback != NULL) (*packet->freeCallback)((void*)packet); enet_free(packet); } static int initializedCRC32 = 0; static enet_uint32 crcTable[256]; static enet_uint32 reflect_crc(int val, int bits) { int result = 0, bit; for (bit = 0; bit < bits; bit++) { if (val & 1) result |= 1 << (bits - 1 - bit); val >>= 1; } return result; } static void initialize_crc32(void) { int byte; for (byte = 0; byte < 256; ++byte) { enet_uint32 crc = reflect_crc(byte, 8) << 24; int offset; for (offset = 0; offset < 8; ++offset) { if (crc & 0x80000000) crc = (crc << 1) ^ 0x04c11db7; else crc <<= 1; } crcTable[byte] = reflect_crc(crc, 32); } initializedCRC32 = 1; } enet_uint32 enet_crc32(const ENetBuffer* buffers, size_t bufferCount) { enet_uint32 crc = 0xFFFFFFFF; if (!initializedCRC32) initialize_crc32(); while (bufferCount-- > 0) { const enet_uint8* data = (const enet_uint8*)buffers->data; const enet_uint8* dataEnd = &data[buffers->dataLength]; while (data < dataEnd) { crc = (crc >> 8) ^ crcTable[(crc & 0xFF)^* data++]; } ++buffers; } return ENET_HOST_TO_NET_32(~crc); } // =======================================================================// // ! // ! Protocol // ! // =======================================================================// static size_t commandSizes[ENET_PROTOCOL_COMMAND_COUNT] = { 0, sizeof(ENetProtocolAcknowledge), sizeof(ENetProtocolConnect), sizeof(ENetProtocolVerifyConnect), sizeof(ENetProtocolDisconnect), sizeof(ENetProtocolPing), sizeof(ENetProtocolSendReliable), sizeof(ENetProtocolSendUnreliable), sizeof(ENetProtocolSendFragment), sizeof(ENetProtocolSendUnsequenced), sizeof(ENetProtocolBandwidthLimit), sizeof(ENetProtocolThrottleConfigure), sizeof(ENetProtocolSendFragment) }; size_t enet_protocol_command_size(enet_uint8 commandNumber) { return commandSizes[commandNumber & ENET_PROTOCOL_COMMAND_MASK]; } static void enet_protocol_change_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) { if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER) enet_peer_on_connect(peer); else enet_peer_on_disconnect(peer); peer->state = state; } static void enet_protocol_dispatch_state(ENetHost* host, ENetPeer* peer, ENetPeerState state) { enet_protocol_change_state(host, peer, state); if (!peer->needsDispatch) { enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList); peer->needsDispatch = 1; } } static int enet_protocol_dispatch_incoming_commands(ENetHost* host, ENetEvent* event) { while (!enet_list_empty(&host->dispatchQueue)) { ENetPeer* peer = (ENetPeer*)enet_list_remove(enet_list_begin(&host->dispatchQueue)); peer->needsDispatch = 0; switch (peer->state) { case ENET_PEER_STATE_CONNECTION_PENDING: case ENET_PEER_STATE_CONNECTION_SUCCEEDED: enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED); event->type = ENET_EVENT_TYPE_CONNECT; event->peer = peer; event->data = peer->eventData; return 1; case ENET_PEER_STATE_ZOMBIE: host->recalculateBandwidthLimits = 1; event->type = ENET_EVENT_TYPE_DISCONNECT; event->peer = peer; event->data = peer->eventData; enet_peer_reset(peer); return 1; case ENET_PEER_STATE_CONNECTED: if (enet_list_empty(&peer->dispatchedCommands)) continue; event->packet = enet_peer_receive(peer, &event->channelID); if (event->packet == NULL) continue; event->type = ENET_EVENT_TYPE_RECEIVE; event->peer = peer; if (!enet_list_empty(&peer->dispatchedCommands)) { peer->needsDispatch = 1; enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList); } return 1; default: break; } } return 0; } static void enet_protocol_notify_connect(ENetHost* host, ENetPeer* peer, ENetEvent* event) { host->recalculateBandwidthLimits = 1; if (event != NULL) { enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED); peer->totalDataSent = 0; peer->totalDataReceived = 0; peer->totalPacketsSent = 0; peer->totalPacketsLost = 0; event->type = ENET_EVENT_TYPE_CONNECT; event->peer = peer; event->data = peer->eventData; } else { enet_protocol_dispatch_state(host, peer, peer->state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING); } } static void enet_protocol_notify_disconnect(ENetHost* host, ENetPeer* peer, ENetEvent* event) { if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING) host->recalculateBandwidthLimits = 1; if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) { enet_peer_reset(peer); } else if (event != NULL) { event->type = ENET_EVENT_TYPE_DISCONNECT; event->peer = peer; event->data = 0; enet_peer_reset(peer); } else { peer->eventData = 0; enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE); } } static void enet_protocol_notify_disconnect_timeout(ENetHost* host, ENetPeer* peer, ENetEvent* event) { if (peer->state >= ENET_PEER_STATE_CONNECTION_PENDING) host->recalculateBandwidthLimits = 1; if (peer->state != ENET_PEER_STATE_CONNECTING && peer->state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) { enet_peer_reset(peer); } else if (event != NULL) { event->type = ENET_EVENT_TYPE_DISCONNECT_TIMEOUT; event->peer = peer; event->data = 0; enet_peer_reset(peer); } else { peer->eventData = 0; enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE); } } static void enet_protocol_remove_sent_unreliable_commands(ENetPeer* peer) { ENetOutgoingCommand* outgoingCommand; if (enet_list_empty(&peer->sentUnreliableCommands)) return; do { outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentUnreliableCommands); enet_list_remove(&outgoingCommand->outgoingCommandList); if (outgoingCommand->packet != NULL) { --outgoingCommand->packet->referenceCount; if (outgoingCommand->packet->referenceCount == 0) { outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT; enet_packet_destroy(outgoingCommand->packet); } } enet_free(outgoingCommand); } while (!enet_list_empty(&peer->sentUnreliableCommands)); if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands)) enet_peer_disconnect(peer, peer->eventData); } static ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer* peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID) { ENetOutgoingCommand* outgoingCommand = NULL; ENetListIterator currentCommand; ENetProtocolCommand commandNumber; int wasSent = 1; for (currentCommand = enet_list_begin(&peer->sentReliableCommands); currentCommand != enet_list_end(&peer->sentReliableCommands); currentCommand = enet_list_next(currentCommand)) { outgoingCommand = (ENetOutgoingCommand*)currentCommand; if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID) break; } if (currentCommand == enet_list_end(&peer->sentReliableCommands)) { for (currentCommand = enet_list_begin(&peer->outgoingReliableCommands); currentCommand != enet_list_end(&peer->outgoingReliableCommands); currentCommand = enet_list_next(currentCommand)) { outgoingCommand = (ENetOutgoingCommand*)currentCommand; if (outgoingCommand->sendAttempts < 1) return ENET_PROTOCOL_COMMAND_NONE; if (outgoingCommand->reliableSequenceNumber == reliableSequenceNumber && outgoingCommand->command.header.channelID == channelID) break; } if (currentCommand == enet_list_end(&peer->outgoingReliableCommands)) return ENET_PROTOCOL_COMMAND_NONE; wasSent = 0; } if (outgoingCommand == NULL) return ENET_PROTOCOL_COMMAND_NONE; if (channelID < peer->channelCount) { ENetChannel* channel = &peer->channels[channelID]; enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; if (channel->reliableWindows[reliableWindow] > 0) { --channel->reliableWindows[reliableWindow]; if (!channel->reliableWindows[reliableWindow]) channel->usedReliableWindows &= ~(1 << reliableWindow); } } commandNumber = (ENetProtocolCommand)(outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK); enet_list_remove(&outgoingCommand->outgoingCommandList); if (outgoingCommand->packet != NULL) { if (wasSent) peer->reliableDataInTransit -= outgoingCommand->fragmentLength; --outgoingCommand->packet->referenceCount; if (outgoingCommand->packet->referenceCount == 0) { outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT; enet_packet_destroy(outgoingCommand->packet); } } enet_free(outgoingCommand); if (enet_list_empty(&peer->sentReliableCommands)) return commandNumber; outgoingCommand = (ENetOutgoingCommand*)enet_list_front(&peer->sentReliableCommands); peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout; return commandNumber; } static ENetPeer* enet_protocol_handle_connect(ENetHost* host, ENetProtocolHeader* header, ENetProtocol* command) { enet_uint8 incomingSessionID, outgoingSessionID; enet_uint32 mtu, windowSize; ENetChannel* channel; size_t channelCount, duplicatePeers = 0; ENetPeer* currentPeer, *peer = NULL; ENetProtocol verifyCommand; channelCount = ENET_NET_TO_HOST_32(command->connect.channelCount); if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT) return NULL; for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) { if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) { if (peer == NULL) peer = currentPeer; } else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && in6_equal(currentPeer->address.host, host->receivedAddress.host)) { if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID) return NULL; ++duplicatePeers; } } if (peer == NULL || duplicatePeers >= host->duplicatePeers) return NULL; if (channelCount > host->channelLimit) channelCount = host->channelLimit; peer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel)); if (peer->channels == NULL) return NULL; peer->channelCount = channelCount; peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT; peer->connectID = command->connect.connectID; peer->address = host->receivedAddress; peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID); peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth); peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth); peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval); peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration); peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration); peer->eventData = ENET_NET_TO_HOST_32(command->connect.data); incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID; incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT); if (incomingSessionID == peer->outgoingSessionID) incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT); peer->outgoingSessionID = incomingSessionID; outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID; outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT); if (outgoingSessionID == peer->incomingSessionID) outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT); peer->incomingSessionID = outgoingSessionID; for (channel = peer->channels; channel < &peer->channels[channelCount]; ++channel) { channel->outgoingReliableSequenceNumber = 0; channel->outgoingUnreliableSequenceNumber = 0; channel->incomingReliableSequenceNumber = 0; channel->incomingUnreliableSequenceNumber = 0; enet_list_clear(&channel->incomingReliableCommands); enet_list_clear(&channel->incomingUnreliableCommands); channel->usedReliableWindows = 0; memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows)); } mtu = ENET_NET_TO_HOST_32(command->connect.mtu); if (mtu < ENET_PROTOCOL_MINIMUM_MTU) mtu = ENET_PROTOCOL_MINIMUM_MTU; else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU) mtu = ENET_PROTOCOL_MAXIMUM_MTU; peer->mtu = mtu; if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0) peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0) peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; else peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE) peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE) peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; if (host->incomingBandwidth == 0) windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; else windowSize = (host->incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; if (windowSize > ENET_NET_TO_HOST_32(command->connect.windowSize)) windowSize = ENET_NET_TO_HOST_32(command->connect.windowSize); if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE) windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; else if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE) windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE; verifyCommand.header.channelID = 0xFF; verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16(peer->incomingPeerID); verifyCommand.verifyConnect.incomingSessionID = incomingSessionID; verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID; verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu); verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize); verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount); verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth); verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth); verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval); verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(peer->packetThrottleAcceleration); verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(peer->packetThrottleDeceleration); verifyCommand.verifyConnect.connectID = peer->connectID; enet_peer_queue_outgoing_command(peer, &verifyCommand, NULL, 0, 0); return peer; } static int enet_protocol_handle_send_reliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) { size_t dataLength; if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) return -1; dataLength = ENET_NET_TO_HOST_16(command->sendReliable.dataLength); *currentData += dataLength; if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength]) return -1; if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) == NULL) return -1; return 0; } static int enet_protocol_handle_send_unsequenced(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) { enet_uint32 unsequencedGroup, index; size_t dataLength; if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) return -1; dataLength = ENET_NET_TO_HOST_16(command->sendUnsequenced.dataLength); *currentData += dataLength; if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength]) return -1; unsequencedGroup = ENET_NET_TO_HOST_16(command->sendUnsequenced.unsequencedGroup); index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE; if (unsequencedGroup < peer->incomingUnsequencedGroup) unsequencedGroup += 0x10000; if (unsequencedGroup >= (enet_uint32)peer->incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE) return 0; unsequencedGroup &= 0xFFFF; if (unsequencedGroup - index != peer->incomingUnsequencedGroup) { peer->incomingUnsequencedGroup = unsequencedGroup - index; memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow)); } else if (peer->unsequencedWindow[index / 32] & (1 << (index % 32))) { return 0; } if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) == NULL) return -1; peer->unsequencedWindow[index / 32] |= 1 << (index % 32); return 0; } static int enet_protocol_handle_send_unreliable(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) { size_t dataLength; if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) return -1; dataLength = ENET_NET_TO_HOST_16(command->sendUnreliable.dataLength); *currentData += dataLength; if (dataLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength]) return -1; if (enet_peer_queue_incoming_command(peer, command, (const enet_uint8*)command + sizeof(ENetProtocolSendUnreliable), dataLength, 0, 0) == NULL) return -1; return 0; } static int enet_protocol_handle_send_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) { enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, startSequenceNumber, totalLength; ENetChannel* channel; enet_uint16 startWindow, currentWindow; ENetListIterator currentCommand; ENetIncomingCommand* startCommand = NULL; if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) return -1; fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength); *currentData += fragmentLength; if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength]) return -1; channel = &peer->channels[command->header.channelID]; startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber); startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; if (startSequenceNumber < channel->incomingReliableSequenceNumber) startWindow += ENET_PEER_RELIABLE_WINDOWS; if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1) return 0; fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber); fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount); fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset); totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength); if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset) return -1; for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) { ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand; if (startSequenceNumber >= channel->incomingReliableSequenceNumber) { if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber) continue; } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) { break; } if (incomingCommand->reliableSequenceNumber <= startSequenceNumber) { if (incomingCommand->reliableSequenceNumber < startSequenceNumber) break; if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount) return -1; startCommand = incomingCommand; break; } } if (startCommand == NULL) { ENetProtocol hostCommand = *command; hostCommand.header.reliableSequenceNumber = startSequenceNumber; startCommand = enet_peer_queue_incoming_command(peer, &hostCommand, NULL, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount); if (startCommand == NULL) return -1; } if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) { --startCommand->fragmentsRemaining; startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32)); if (fragmentOffset + fragmentLength > startCommand->packet->dataLength) fragmentLength = startCommand->packet->dataLength - fragmentOffset; memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength); if (startCommand->fragmentsRemaining <= 0) enet_peer_dispatch_incoming_reliable_commands(peer, channel); } return 0; } static int enet_protocol_handle_send_unreliable_fragment(ENetHost* host, ENetPeer* peer, const ENetProtocol* command, enet_uint8** currentData) { enet_uint32 fragmentNumber, fragmentCount, fragmentOffset, fragmentLength, reliableSequenceNumber, startSequenceNumber, totalLength; enet_uint16 reliableWindow, currentWindow; ENetChannel* channel; ENetListIterator currentCommand; ENetIncomingCommand* startCommand = NULL; if (command->header.channelID >= peer->channelCount || (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER)) return -1; fragmentLength = ENET_NET_TO_HOST_16(command->sendFragment.dataLength); *currentData += fragmentLength; if (fragmentLength > host->maximumPacketSize || *currentData < host->receivedData || *currentData > &host->receivedData[host->receivedDataLength]) return -1; channel = &peer->channels[command->header.channelID]; reliableSequenceNumber = command->header.reliableSequenceNumber; startSequenceNumber = ENET_NET_TO_HOST_16(command->sendFragment.startSequenceNumber); reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; if (reliableSequenceNumber < channel->incomingReliableSequenceNumber) reliableWindow += ENET_PEER_RELIABLE_WINDOWS; if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1) return 0; if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && startSequenceNumber <= channel->incomingUnreliableSequenceNumber) return 0; fragmentNumber = ENET_NET_TO_HOST_32(command->sendFragment.fragmentNumber); fragmentCount = ENET_NET_TO_HOST_32(command->sendFragment.fragmentCount); fragmentOffset = ENET_NET_TO_HOST_32(command->sendFragment.fragmentOffset); totalLength = ENET_NET_TO_HOST_32(command->sendFragment.totalLength); if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT || fragmentNumber >= fragmentCount || totalLength > host->maximumPacketSize || fragmentOffset >= totalLength || fragmentLength > totalLength - fragmentOffset) return -1; for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) { ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand; if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) { if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber) continue; } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) { break; } if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber) break; if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber) continue; if (incomingCommand->unreliableSequenceNumber <= startSequenceNumber) { if (incomingCommand->unreliableSequenceNumber < startSequenceNumber) break; if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || totalLength != incomingCommand->packet->dataLength || fragmentCount != incomingCommand->fragmentCount) return -1; startCommand = incomingCommand; break; } } if (startCommand == NULL) { startCommand = enet_peer_queue_incoming_command(peer, command, NULL, totalLength, ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT, fragmentCount); if (startCommand == NULL) return -1; } if ((startCommand->fragments[fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0) { --startCommand->fragmentsRemaining; startCommand->fragments[fragmentNumber / 32] |= (1 << (fragmentNumber % 32)); if (fragmentOffset + fragmentLength > startCommand->packet->dataLength) fragmentLength = startCommand->packet->dataLength - fragmentOffset; memcpy(startCommand->packet->data + fragmentOffset, (enet_uint8*)command + sizeof(ENetProtocolSendFragment), fragmentLength); if (startCommand->fragmentsRemaining <= 0) enet_peer_dispatch_incoming_unreliable_commands(peer, channel); } return 0; } static int enet_protocol_handle_ping(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) { if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) return -1; return 0; } static int enet_protocol_handle_bandwidth_limit(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) { if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) return -1; if (peer->incomingBandwidth != 0) --host->bandwidthLimitedPeers; peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.incomingBandwidth); peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->bandwidthLimit.outgoingBandwidth); if (peer->incomingBandwidth != 0) ++host->bandwidthLimitedPeers; if (peer->incomingBandwidth == 0 && host->outgoingBandwidth == 0) peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; else if (peer->incomingBandwidth == 0 || host->outgoingBandwidth == 0) peer->windowSize = (ENET_MAX(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; else peer->windowSize = (ENET_MIN(peer->incomingBandwidth, host->outgoingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; if (peer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE) peer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; else if (peer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE) peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; return 0; } static int enet_protocol_handle_throttle_configure(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) { if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) return -1; peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleInterval); peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleAcceleration); peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->throttleConfigure.packetThrottleDeceleration); return 0; } static int enet_protocol_handle_disconnect(ENetHost* host, ENetPeer* peer, const ENetProtocol* command) { if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT) return 0; enet_peer_reset_queues(peer); if (peer->state == ENET_PEER_STATE_CONNECTION_SUCCEEDED || peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_CONNECTING) { enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE); } else if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) { if (peer->state == ENET_PEER_STATE_CONNECTION_PENDING) host->recalculateBandwidthLimits = 1; enet_peer_reset(peer); } else if (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) { enet_protocol_change_state(host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT); } else { enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE); } if (peer->state != ENET_PEER_STATE_DISCONNECTED) peer->eventData = ENET_NET_TO_HOST_32(command->disconnect.data); return 0; } static int enet_protocol_handle_acknowledge(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) { enet_uint32 roundTripTime, receivedSentTime, receivedReliableSequenceNumber; ENetProtocolCommand commandNumber; if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE) return 0; receivedSentTime = ENET_NET_TO_HOST_16(command->acknowledge.receivedSentTime); receivedSentTime |= host->serviceTime & 0xFFFF0000; if ((receivedSentTime & 0x8000) > (host->serviceTime & 0x8000)) receivedSentTime -= 0x10000; if (ENET_TIME_LESS(host->serviceTime, receivedSentTime)) return 0; peer->lastReceiveTime = host->serviceTime; peer->earliestTimeout = 0; roundTripTime = ENET_TIME_DIFFERENCE(host->serviceTime, receivedSentTime); if (roundTripTime == 0) roundTripTime = 1; if (peer->smoothedRoundTripTime == 0) peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * ENET_SRTT_INITIAL + ENET_SRTT_PARA_G * roundTripTime); else peer->smoothedRoundTripTime = (enet_uint32)((1 - ENET_SRTT_PARA_G) * peer->smoothedRoundTripTime + ENET_SRTT_PARA_G * roundTripTime); enet_peer_throttle(peer, peer->smoothedRoundTripTime); peer->roundTripTimeVariance -= peer->roundTripTimeVariance / 4; if (peer->smoothedRoundTripTime >= peer->roundTripTime) { peer->roundTripTime += (peer->smoothedRoundTripTime - peer->roundTripTime) / 8; peer->roundTripTimeVariance += (peer->smoothedRoundTripTime - peer->roundTripTime) / 4; } else { peer->roundTripTime -= (peer->roundTripTime - peer->smoothedRoundTripTime) / 8; peer->roundTripTimeVariance += (peer->roundTripTime - peer->smoothedRoundTripTime) / 4; } if (peer->roundTripTime < peer->lowestRoundTripTime) peer->lowestRoundTripTime = peer->roundTripTime; if (peer->roundTripTimeVariance > peer->highestRoundTripTimeVariance) peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance; if (peer->packetThrottleEpoch == 0 || ENET_TIME_DIFFERENCE(host->serviceTime, peer->packetThrottleEpoch) >= peer->packetThrottleInterval) { peer->lastRoundTripTime = peer->lowestRoundTripTime; peer->lastRoundTripTimeVariance = peer->highestRoundTripTimeVariance; peer->lowestRoundTripTime = peer->roundTripTime; peer->highestRoundTripTimeVariance = peer->roundTripTimeVariance; peer->packetThrottleEpoch = host->serviceTime; } receivedReliableSequenceNumber = ENET_NET_TO_HOST_16(command->acknowledge.receivedReliableSequenceNumber); commandNumber = enet_protocol_remove_sent_reliable_command(peer, receivedReliableSequenceNumber, command->header.channelID); switch (peer->state) { case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT: if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT) return -1; enet_protocol_notify_connect(host, peer, event); break; case ENET_PEER_STATE_DISCONNECTING: if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT) return -1; enet_protocol_notify_disconnect(host, peer, event); break; case ENET_PEER_STATE_DISCONNECT_LATER: if (enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands)) enet_peer_disconnect(peer, peer->eventData); break; default: break; } return 0; } static int enet_protocol_handle_verify_connect(ENetHost* host, ENetEvent* event, ENetPeer* peer, const ENetProtocol* command) { enet_uint32 mtu, windowSize; size_t channelCount; if (peer->state != ENET_PEER_STATE_CONNECTING) return 0; channelCount = ENET_NET_TO_HOST_32(command->verifyConnect.channelCount); if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT || ENET_NET_TO_HOST_32(command->verifyConnect.packetThrottleInterval) != peer->packetThrottleInterval || ENET_NET_TO_HOST_32(command->verifyConnect.packetThrottleAcceleration) != peer->packetThrottleAcceleration || ENET_NET_TO_HOST_32(command->verifyConnect.packetThrottleDeceleration) != peer->packetThrottleDeceleration || command->verifyConnect.connectID != peer->connectID) { peer->eventData = 0; enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE); return -1; } enet_protocol_remove_sent_reliable_command(peer, 1, 0xFF); if (channelCount < peer->channelCount) peer->channelCount = channelCount; peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->verifyConnect.outgoingPeerID); peer->incomingSessionID = command->verifyConnect.incomingSessionID; peer->outgoingSessionID = command->verifyConnect.outgoingSessionID; mtu = ENET_NET_TO_HOST_32(command->verifyConnect.mtu); if (mtu < ENET_PROTOCOL_MINIMUM_MTU) mtu = ENET_PROTOCOL_MINIMUM_MTU; else if (mtu > ENET_PROTOCOL_MAXIMUM_MTU) mtu = ENET_PROTOCOL_MAXIMUM_MTU; if (mtu < peer->mtu) peer->mtu = mtu; windowSize = ENET_NET_TO_HOST_32(command->verifyConnect.windowSize); if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE) windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE) windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; if (windowSize < peer->windowSize) peer->windowSize = windowSize; peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.incomingBandwidth); peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->verifyConnect.outgoingBandwidth); enet_protocol_notify_connect(host, peer, event); return 0; } static int enet_protocol_handle_incoming_commands(ENetHost* host, ENetEvent* event) { ENetProtocolHeader* header; ENetProtocol* command; ENetPeer* peer; enet_uint8* currentData; size_t headerSize; enet_uint16 peerID, flags; enet_uint8 sessionID; if (host->receivedDataLength < (size_t)&((ENetProtocolHeader*)0)->sentTime) return 0; header = (ENetProtocolHeader*)host->receivedData; peerID = ENET_NET_TO_HOST_16(header->peerID); sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT; flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK; peerID &= ~(ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK); headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof(ENetProtocolHeader) : (size_t)&((ENetProtocolHeader*)0)->sentTime); if (host->checksumCallback != NULL) headerSize += sizeof(enet_uint32); if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID) { peer = NULL; } else if (peerID >= host->peerCount) { return 0; } else { peer = &host->peers[peerID]; if (peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ZOMBIE || ((!in6_equal(host->receivedAddress.host, peer->address.host) || host->receivedAddress.port != peer->address.port) && 1 /* No broadcast in IPv6 - !in6_equal(peer->address.host, ENET_HOST_BROADCAST) */) || (peer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID && sessionID != peer->incomingSessionID)) return 0; } #ifdef ENET_LZ4 if (flags & ENET_PROTOCOL_HEADER_FLAG_COMPRESSED) { size_t originalSize = LZ4_decompress_safe((const char*)host->receivedData + headerSize, (char*)host->packetData[1] + headerSize, host->receivedDataLength - headerSize, sizeof(host->packetData[1]) - headerSize); if (originalSize <= 0 || originalSize > sizeof(host->packetData[1]) - headerSize) return 0; memcpy(host->packetData[1], header, headerSize); host->receivedData = host->packetData[1]; host->receivedDataLength = headerSize + originalSize; } #endif if (host->checksumCallback != NULL) { enet_uint32* checksum = (enet_uint32*)&host->receivedData[headerSize - sizeof(enet_uint32)]; enet_uint32 desiredChecksum = *checksum; ENetBuffer buffer; *checksum = peer != NULL ? peer->connectID : 0; buffer.data = host->receivedData; buffer.dataLength = host->receivedDataLength; if (host->checksumCallback(&buffer, 1) != desiredChecksum) return 0; } if (peer != NULL) { peer->address.host = host->receivedAddress.host; peer->address.port = host->receivedAddress.port; peer->incomingDataTotal += host->receivedDataLength; peer->totalDataReceived += host->receivedDataLength; } currentData = host->receivedData + headerSize; while (currentData < &host->receivedData[host->receivedDataLength]) { enet_uint8 commandNumber; size_t commandSize; command = (ENetProtocol*)currentData; if (currentData + sizeof(ENetProtocolCommandHeader) > &host->receivedData[host->receivedDataLength]) break; commandNumber = command->header.command & ENET_PROTOCOL_COMMAND_MASK; if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT) break; commandSize = commandSizes[commandNumber]; if (commandSize == 0 || currentData + commandSize > &host->receivedData[host->receivedDataLength]) break; currentData += commandSize; if (peer == NULL && (commandNumber != ENET_PROTOCOL_COMMAND_CONNECT || currentData < &host->receivedData[host->receivedDataLength])) break; command->header.reliableSequenceNumber = ENET_NET_TO_HOST_16(command->header.reliableSequenceNumber); switch (commandNumber) { case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE: if (enet_protocol_handle_acknowledge(host, event, peer, command)) goto commandError; break; case ENET_PROTOCOL_COMMAND_CONNECT: if (peer != NULL) goto commandError; if (host->preventConnections == 0) { peer = enet_protocol_handle_connect(host, header, command); if (peer == NULL) goto commandError; } break; case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT: if (enet_protocol_handle_verify_connect(host, event, peer, command)) goto commandError; break; case ENET_PROTOCOL_COMMAND_DISCONNECT: if (enet_protocol_handle_disconnect(host, peer, command)) goto commandError; break; case ENET_PROTOCOL_COMMAND_PING: if (enet_protocol_handle_ping(host, peer, command)) goto commandError; break; case ENET_PROTOCOL_COMMAND_SEND_RELIABLE: if (enet_protocol_handle_send_reliable(host, peer, command, ¤tData)) goto commandError; break; case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE: if (enet_protocol_handle_send_unreliable(host, peer, command, ¤tData)) goto commandError; break; case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED: if (enet_protocol_handle_send_unsequenced(host, peer, command, ¤tData)) goto commandError; break; case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT: if (enet_protocol_handle_send_fragment(host, peer, command, ¤tData)) goto commandError; break; case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT: if (enet_protocol_handle_bandwidth_limit(host, peer, command)) goto commandError; break; case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE: if (enet_protocol_handle_throttle_configure(host, peer, command)) goto commandError; break; case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT: if (enet_protocol_handle_send_unreliable_fragment(host, peer, command, ¤tData)) goto commandError; break; default: goto commandError; } if (peer != NULL && (command->header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0) { enet_uint16 sentTime; if (!(flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME)) break; sentTime = ENET_NET_TO_HOST_16(header->sentTime); switch (peer->state) { case ENET_PEER_STATE_DISCONNECTING: case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT: case ENET_PEER_STATE_DISCONNECTED: case ENET_PEER_STATE_ZOMBIE: break; case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT: if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT) enet_peer_queue_acknowledgement(peer, command, sentTime); break; default: enet_peer_queue_acknowledgement(peer, command, sentTime); break; } } } commandError: if (event != NULL && event->type != ENET_EVENT_TYPE_NONE) return 1; return 0; } static int enet_protocol_receive_incoming_commands(ENetHost* host, ENetEvent* event) { int packets; for (packets = 0; packets < 256; ++packets) { int receivedLength; ENetBuffer buffer; buffer.data = host->packetData[0]; buffer.dataLength = host->mtu; receivedLength = enet_socket_receive(host->socket, &host->receivedAddress, &buffer, 1); if (receivedLength == -2) continue; if (receivedLength < 0) return -1; if (receivedLength == 0) return 0; host->receivedData = host->packetData[0]; host->receivedDataLength = receivedLength; host->totalReceivedData += receivedLength; host->totalReceivedPackets++; if (host->interceptCallback != NULL) { switch (host->interceptCallback(host, (void*)event)) { case 1: if (event != NULL && event->type != ENET_EVENT_TYPE_NONE) return 1; continue; case -1: return -1; default: break; } } switch (enet_protocol_handle_incoming_commands(host, event)) { case 1: return 1; case -1: return -1; default: break; } } return -1; } static void enet_protocol_send_acknowledgements(ENetHost* host, ENetPeer* peer) { ENetProtocol* command = &host->commands[host->commandCount]; ENetBuffer* buffer = &host->buffers[host->bufferCount]; ENetAcknowledgement* acknowledgement; ENetListIterator currentAcknowledgement; enet_uint16 reliableSequenceNumber; currentAcknowledgement = enet_list_begin(&peer->acknowledgements); while (currentAcknowledgement != enet_list_end(&peer->acknowledgements)) { if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < sizeof(ENetProtocolAcknowledge)) { host->continueSending = 1; break; } acknowledgement = (ENetAcknowledgement*)currentAcknowledgement; currentAcknowledgement = enet_list_next(currentAcknowledgement); buffer->data = command; buffer->dataLength = sizeof(ENetProtocolAcknowledge); host->packetSize += buffer->dataLength; reliableSequenceNumber = ENET_HOST_TO_NET_16(acknowledgement->command.header.reliableSequenceNumber); command->header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE; command->header.channelID = acknowledgement->command.header.channelID; command->header.reliableSequenceNumber = reliableSequenceNumber; command->acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber; command->acknowledge.receivedSentTime = ENET_HOST_TO_NET_16(acknowledgement->sentTime); if ((acknowledgement->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT) enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE); enet_list_remove(&acknowledgement->acknowledgementList); enet_free(acknowledgement); ++command; ++buffer; } host->commandCount = command - host->commands; host->bufferCount = buffer - host->buffers; } static void enet_protocol_send_unreliable_outgoing_commands(ENetHost* host, ENetPeer* peer) { ENetProtocol* command = &host->commands[host->commandCount]; ENetBuffer* buffer = &host->buffers[host->bufferCount]; ENetOutgoingCommand* outgoingCommand; ENetListIterator currentCommand; currentCommand = enet_list_begin(&peer->outgoingUnreliableCommands); while (currentCommand != enet_list_end(&peer->outgoingUnreliableCommands)) { size_t commandSize; outgoingCommand = (ENetOutgoingCommand*)currentCommand; commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK]; if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer + 1 >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < commandSize || (outgoingCommand->packet != NULL && peer->mtu - host->packetSize < commandSize + outgoingCommand->fragmentLength)) { host->continueSending = 1; break; } currentCommand = enet_list_next(currentCommand); if (outgoingCommand->packet != NULL && outgoingCommand->fragmentOffset == 0) { peer->packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER; peer->packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE; if (peer->packetThrottleCounter > peer->packetThrottle) { enet_uint16 reliableSequenceNumber = outgoingCommand->reliableSequenceNumber; enet_uint16 unreliableSequenceNumber = outgoingCommand->unreliableSequenceNumber; for (;;) { --outgoingCommand->packet->referenceCount; if (outgoingCommand->packet->referenceCount == 0) enet_packet_destroy(outgoingCommand->packet); enet_list_remove(&outgoingCommand->outgoingCommandList); enet_free(outgoingCommand); if (currentCommand == enet_list_end(&peer->outgoingUnreliableCommands)) break; outgoingCommand = (ENetOutgoingCommand*)currentCommand; if (outgoingCommand->reliableSequenceNumber != reliableSequenceNumber || outgoingCommand->unreliableSequenceNumber != unreliableSequenceNumber) break; currentCommand = enet_list_next(currentCommand); } continue; } } buffer->data = command; buffer->dataLength = commandSize; host->packetSize += buffer->dataLength; *command = outgoingCommand->command; enet_list_remove(&outgoingCommand->outgoingCommandList); if (outgoingCommand->packet != NULL) { ++buffer; buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset; buffer->dataLength = outgoingCommand->fragmentLength; host->packetSize += buffer->dataLength; enet_list_insert(enet_list_end(&peer->sentUnreliableCommands), outgoingCommand); } else { enet_free(outgoingCommand); } ++command; ++buffer; } host->commandCount = command - host->commands; host->bufferCount = buffer - host->buffers; if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER && enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands) && enet_list_empty(&peer->sentUnreliableCommands)) enet_peer_disconnect(peer, peer->eventData); } static int enet_protocol_check_timeouts(ENetHost* host, ENetPeer* peer, ENetEvent* event) { ENetOutgoingCommand* outgoingCommand; ENetListIterator currentCommand, insertPosition; currentCommand = enet_list_begin(&peer->sentReliableCommands); insertPosition = enet_list_begin(&peer->outgoingReliableCommands); while (currentCommand != enet_list_end(&peer->sentReliableCommands)) { outgoingCommand = (ENetOutgoingCommand*)currentCommand; currentCommand = enet_list_next(currentCommand); if (ENET_TIME_DIFFERENCE(host->serviceTime, outgoingCommand->sentTime) < outgoingCommand->roundTripTimeout) continue; if (peer->earliestTimeout == 0 || ENET_TIME_LESS(outgoingCommand->sentTime, peer->earliestTimeout)) peer->earliestTimeout = outgoingCommand->sentTime; if (peer->earliestTimeout != 0 && (ENET_TIME_DIFFERENCE(host->serviceTime, peer->earliestTimeout) >= peer->timeoutMaximum || (outgoingCommand->roundTripTimeout >= outgoingCommand->roundTripTimeoutLimit && ENET_TIME_DIFFERENCE(host->serviceTime, peer->earliestTimeout) >= peer->timeoutMinimum))) { enet_protocol_notify_disconnect_timeout(host, peer, event); return 1; } if (outgoingCommand->packet != NULL) peer->reliableDataInTransit -= outgoingCommand->fragmentLength; ++peer->packetsLost; ++peer->totalPacketsLost; outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance; outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout; enet_list_insert(insertPosition, enet_list_remove(&outgoingCommand->outgoingCommandList)); if (currentCommand == enet_list_begin(&peer->sentReliableCommands) && !enet_list_empty(&peer->sentReliableCommands)) { outgoingCommand = (ENetOutgoingCommand*)currentCommand; peer->nextTimeout = outgoingCommand->sentTime + outgoingCommand->roundTripTimeout; } } return 0; } static int enet_protocol_send_reliable_outgoing_commands(ENetHost* host, ENetPeer* peer) { ENetProtocol* command = &host->commands[host->commandCount]; ENetBuffer* buffer = &host->buffers[host->bufferCount]; ENetOutgoingCommand* outgoingCommand; ENetListIterator currentCommand; ENetChannel* channel; enet_uint16 reliableWindow; size_t commandSize; int windowExceeded = 0, windowWrap = 0, canPing = 1; currentCommand = enet_list_begin(&peer->outgoingReliableCommands); while (currentCommand != enet_list_end(&peer->outgoingReliableCommands)) { outgoingCommand = (ENetOutgoingCommand*)currentCommand; channel = outgoingCommand->command.header.channelID < peer->channelCount ? &peer->channels[outgoingCommand->command.header.channelID] : NULL; reliableWindow = outgoingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; if (channel != NULL) { if (!windowWrap && outgoingCommand->sendAttempts < 1 && !(outgoingCommand->reliableSequenceNumber % ENET_PEER_RELIABLE_WINDOW_SIZE) && (channel->reliableWindows[(reliableWindow + ENET_PEER_RELIABLE_WINDOWS - 1) % ENET_PEER_RELIABLE_WINDOWS] >= ENET_PEER_RELIABLE_WINDOW_SIZE || channel->usedReliableWindows & ((((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) << reliableWindow) | (((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) >> (ENET_PEER_RELIABLE_WINDOWS - reliableWindow))))) windowWrap = 1; if (windowWrap) { currentCommand = enet_list_next(currentCommand); continue; } } if (outgoingCommand->packet != NULL) { if (!windowExceeded) { enet_uint32 windowSize = (peer->packetThrottle * peer->windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE; if (peer->reliableDataInTransit + outgoingCommand->fragmentLength > ENET_MAX(windowSize, peer->mtu)) windowExceeded = 1; } if (windowExceeded) { currentCommand = enet_list_next(currentCommand); continue; } } canPing = 0; commandSize = commandSizes[outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK]; if (command >= &host->commands[sizeof(host->commands) / sizeof(ENetProtocol)] || buffer + 1 >= &host->buffers[sizeof(host->buffers) / sizeof(ENetBuffer)] || peer->mtu - host->packetSize < commandSize || (outgoingCommand->packet != NULL && (enet_uint16)(peer->mtu - host->packetSize) < (enet_uint16)(commandSize + outgoingCommand->fragmentLength))) { host->continueSending = 1; break; } currentCommand = enet_list_next(currentCommand); if (channel != NULL && outgoingCommand->sendAttempts < 1) { channel->usedReliableWindows |= 1 << reliableWindow; ++channel->reliableWindows[reliableWindow]; } ++outgoingCommand->sendAttempts; if (outgoingCommand->roundTripTimeout == 0) { outgoingCommand->roundTripTimeout = peer->roundTripTime + 4 * peer->roundTripTimeVariance; outgoingCommand->roundTripTimeoutLimit = peer->timeoutLimit * outgoingCommand->roundTripTimeout; } if (enet_list_empty(&peer->sentReliableCommands)) peer->nextTimeout = host->serviceTime + outgoingCommand->roundTripTimeout; enet_list_insert(enet_list_end(&peer->sentReliableCommands), enet_list_remove(&outgoingCommand->outgoingCommandList)); outgoingCommand->sentTime = host->serviceTime; buffer->data = command; buffer->dataLength = commandSize; host->packetSize += buffer->dataLength; host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME; *command = outgoingCommand->command; if (outgoingCommand->packet != NULL) { ++buffer; buffer->data = outgoingCommand->packet->data + outgoingCommand->fragmentOffset; buffer->dataLength = outgoingCommand->fragmentLength; host->packetSize += outgoingCommand->fragmentLength; peer->reliableDataInTransit += outgoingCommand->fragmentLength; } ++peer->packetsSent; ++peer->totalPacketsSent; ++command; ++buffer; } host->commandCount = command - host->commands; host->bufferCount = buffer - host->buffers; return canPing; } static int enet_protocol_send_outgoing_commands(ENetHost* host, ENetEvent* event, int checkForTimeouts) { enet_uint8 headerData[sizeof(ENetProtocolHeader) + sizeof(enet_uint32)]; ENetProtocolHeader* header = (ENetProtocolHeader*)headerData; ENetPeer* currentPeer; int sentLength; host->continueSending = 1; #ifdef ENET_LZ4 size_t shouldCompress = 0; #endif while (host->continueSending) { for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) { if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE) continue; host->headerFlags = 0; host->commandCount = 0; host->bufferCount = 1; host->packetSize = sizeof(ENetProtocolHeader); if (!enet_list_empty(¤tPeer->acknowledgements)) enet_protocol_send_acknowledgements(host, currentPeer); if (checkForTimeouts != 0 && !enet_list_empty(¤tPeer->sentReliableCommands) && ENET_TIME_GREATER_EQUAL(host->serviceTime, currentPeer->nextTimeout) && enet_protocol_check_timeouts(host, currentPeer, event) == 1) { if (event != NULL && event->type != ENET_EVENT_TYPE_NONE) return 1; else continue; } if ((enet_list_empty(¤tPeer->outgoingReliableCommands) || enet_protocol_send_reliable_outgoing_commands(host, currentPeer)) && enet_list_empty(¤tPeer->sentReliableCommands) && ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->lastReceiveTime) >= currentPeer->pingInterval && currentPeer->mtu - host->packetSize >= sizeof(ENetProtocolPing)) { enet_peer_ping(currentPeer); enet_protocol_send_reliable_outgoing_commands(host, currentPeer); } if (!enet_list_empty(¤tPeer->outgoingUnreliableCommands)) enet_protocol_send_unreliable_outgoing_commands(host, currentPeer); if (host->commandCount == 0) continue; if (currentPeer->packetLossEpoch == 0) { currentPeer->packetLossEpoch = host->serviceTime; } else if (ENET_TIME_DIFFERENCE(host->serviceTime, currentPeer->packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL && currentPeer->packetsSent > 0) { enet_uint32 packetLoss = currentPeer->packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer->packetsSent; #ifdef ENET_DEBUG printf( "peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u/%u outgoing, %u/%u incoming\n", currentPeer->incomingPeerID, currentPeer->packetLoss / (float)ENET_PEER_PACKET_LOSS_SCALE, currentPeer->packetLossVariance / (float)ENET_PEER_PACKET_LOSS_SCALE, currentPeer->roundTripTime, currentPeer->roundTripTimeVariance, currentPeer->packetThrottle / (float)ENET_PEER_PACKET_THROTTLE_SCALE, enet_list_size(¤tPeer->outgoingReliableCommands), enet_list_size(¤tPeer->outgoingUnreliableCommands), currentPeer->channels != NULL ? enet_list_size(¤tPeer->channels->incomingReliableCommands) : 0, currentPeer->channels != NULL ? enet_list_size(¤tPeer->channels->incomingUnreliableCommands) : 0 ); #endif currentPeer->packetLossVariance -= currentPeer->packetLossVariance / 4; if (packetLoss >= currentPeer->packetLoss) { currentPeer->packetLoss += (packetLoss - currentPeer->packetLoss) / 8; currentPeer->packetLossVariance += (packetLoss - currentPeer->packetLoss) / 4; } else { currentPeer->packetLoss -= (currentPeer->packetLoss - packetLoss) / 8; currentPeer->packetLossVariance += (currentPeer->packetLoss - packetLoss) / 4; } currentPeer->packetLossEpoch = host->serviceTime; currentPeer->packetsSent = 0; currentPeer->packetsLost = 0; } host->buffers->data = headerData; if (host->headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) { header->sentTime = ENET_HOST_TO_NET_16(host->serviceTime & 0xFFFF); host->buffers->dataLength = sizeof(ENetProtocolHeader); } else { host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime; } #ifdef ENET_LZ4 if (host->compression == 1 && host->packetSize > 64) { size_t originalSize = host->packetSize - sizeof(ENetProtocolHeader), compressedSize = 0; const ENetBuffer* buffers = &host->buffers[1]; if (host->compressionBufferSize < originalSize) { enet_free(host->compressionBuffer); host->compressionBuffer = (char*)enet_malloc(originalSize); host->compressionBufferSize = originalSize; } size_t totalSize = originalSize, dataSize = 0; while (totalSize) { size_t i; for (i = 0; i < host->bufferCount - 1; i++) { size_t copySize = ENET_MIN(totalSize, buffers[i].dataLength); memcpy(host->compressionBuffer + dataSize, buffers[i].data, copySize); totalSize -= copySize; dataSize += copySize; } } compressedSize = LZ4_compress_default((const char*)host->compressionBuffer, (char*)host->packetData[1], dataSize, originalSize); if (compressedSize > 0 && compressedSize < originalSize) { host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_COMPRESSED; shouldCompress = compressedSize; #ifdef ENET_DEBUG_COMPRESS printf("peer %u: compressed %u->%u (%u%%)\n", currentPeer->incomingPeerID, originalSize, compressedSize, (compressedSize * 100) / originalSize); #endif } } #endif if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID) host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT; header->peerID = ENET_HOST_TO_NET_16(currentPeer->outgoingPeerID | host->headerFlags); if (host->checksumCallback != NULL) { enet_uint32* checksum = (enet_uint32*)&headerData[host->buffers->dataLength]; *checksum = currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer->connectID : 0; host->buffers->dataLength += sizeof(enet_uint32); *checksum = host->checksumCallback(host->buffers, host->bufferCount); } #ifdef ENET_LZ4 if (shouldCompress > 0) { host->buffers[1].data = host->packetData[1]; host->buffers[1].dataLength = shouldCompress; host->bufferCount = 2; } #endif currentPeer->lastSendTime = host->serviceTime; sentLength = enet_socket_send(host->socket, ¤tPeer->address, host->buffers, host->bufferCount); enet_protocol_remove_sent_unreliable_commands(currentPeer); if (sentLength < 0) return -1; host->totalSentData += sentLength; currentPeer->totalDataSent += sentLength; host->totalSentPackets++; } } return 0; } void enet_host_flush(ENetHost* host) { host->serviceTime = enet_time_get(); enet_protocol_send_outgoing_commands(host, NULL, 0); } int enet_host_check_events(ENetHost* host, ENetEvent* event) { if (event == NULL) return -1; event->type = ENET_EVENT_TYPE_NONE; event->peer = NULL; event->packet = NULL; return enet_protocol_dispatch_incoming_commands(host, event); } int enet_host_service(ENetHost* host, ENetEvent* event, enet_uint32 timeout) { enet_uint32 waitCondition; if (event != NULL) { event->type = ENET_EVENT_TYPE_NONE; event->peer = NULL; event->packet = NULL; switch (enet_protocol_dispatch_incoming_commands(host, event)) { case 1: return 1; case -1: #ifdef ENET_DEBUG perror("Error dispatching incoming packets"); #endif return -1; default: break; } } host->serviceTime = enet_time_get(); timeout += host->serviceTime; do { if (ENET_TIME_DIFFERENCE(host->serviceTime, host->bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL) enet_host_bandwidth_throttle(host); switch (enet_protocol_send_outgoing_commands(host, event, 1)) { case 1: return 1; case -1: #ifdef ENET_DEBUG perror("Error sending outgoing packets"); #endif return -1; default: break; } switch (enet_protocol_receive_incoming_commands(host, event)) { case 1: return 1; case -1: #ifdef ENET_DEBUG perror("Error receiving incoming packets"); #endif return -1; default: break; } switch (enet_protocol_send_outgoing_commands(host, event, 1)) { case 1: return 1; case -1: #ifdef ENET_DEBUG perror("Error sending outgoing packets"); #endif return -1; default: break; } if (event != NULL) { switch (enet_protocol_dispatch_incoming_commands(host, event)) { case 1: return 1; case -1: #ifdef ENET_DEBUG perror("Error dispatching incoming packets"); #endif return -1; default: break; } } if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout)) return 0; do { host->serviceTime = enet_time_get(); if (ENET_TIME_GREATER_EQUAL(host->serviceTime, timeout)) return 0; waitCondition = ENET_SOCKET_WAIT_RECEIVE | ENET_SOCKET_WAIT_INTERRUPT; if (enet_socket_wait(host->socket, &waitCondition, ENET_TIME_DIFFERENCE(timeout, host->serviceTime)) != 0) return -1; } while (waitCondition & ENET_SOCKET_WAIT_INTERRUPT); host->serviceTime = enet_time_get(); } while (waitCondition & ENET_SOCKET_WAIT_RECEIVE); return 0; } // =======================================================================// // ! // ! Peer // ! // =======================================================================// void enet_peer_throttle_configure(ENetPeer* peer, enet_uint32 interval, enet_uint32 acceleration, enet_uint32 deceleration) { ENetProtocol command; peer->packetThrottleInterval = interval; peer->packetThrottleAcceleration = acceleration; peer->packetThrottleDeceleration = deceleration; command.header.command = ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE; command.header.channelID = 0xFF; command.throttleConfigure.packetThrottleInterval = ENET_HOST_TO_NET_32(interval); command.throttleConfigure.packetThrottleAcceleration = ENET_HOST_TO_NET_32(acceleration); command.throttleConfigure.packetThrottleDeceleration = ENET_HOST_TO_NET_32(deceleration); enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0); } int enet_peer_throttle(ENetPeer* peer, enet_uint32 rtt) { if (peer->lastRoundTripTime <= peer->lastRoundTripTimeVariance) { peer->packetThrottle = peer->packetThrottleLimit; } else if (rtt < peer->lastRoundTripTime) { peer->packetThrottle += peer->packetThrottleAcceleration; if (peer->packetThrottle > peer->packetThrottleLimit) peer->packetThrottle = peer->packetThrottleLimit; return 1; } else if (rtt > peer->lastRoundTripTime + 2 * peer->lastRoundTripTimeVariance) { if (peer->packetThrottle > peer->packetThrottleDeceleration) peer->packetThrottle -= peer->packetThrottleDeceleration; else peer->packetThrottle = 0; return -1; } return 0; } int enet_peer_send(ENetPeer* peer, enet_uint8 channelID, ENetPacket* packet) { ENetChannel* channel = &peer->channels[channelID]; ENetProtocol command; size_t fragmentLength; if (peer->state != ENET_PEER_STATE_CONNECTED || channelID >= peer->channelCount || packet->dataLength > peer->host->maximumPacketSize) return -1; fragmentLength = peer->mtu - sizeof(ENetProtocolHeader) - sizeof(ENetProtocolSendFragment); if (peer->host->checksumCallback != NULL) fragmentLength -= sizeof(enet_uint32); if (packet->dataLength > fragmentLength) { enet_uint32 fragmentCount = (packet->dataLength + fragmentLength - 1) / fragmentLength, fragmentNumber, fragmentOffset; enet_uint8 commandNumber; enet_uint16 startSequenceNumber; ENetList fragments; ENetOutgoingCommand* fragment; if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT) return -1; if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT)) == ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT && channel->outgoingUnreliableSequenceNumber < 0xFFFF) { commandNumber = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT; startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingUnreliableSequenceNumber + 1); } else { commandNumber = ENET_PROTOCOL_COMMAND_SEND_FRAGMENT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE; startSequenceNumber = ENET_HOST_TO_NET_16(channel->outgoingReliableSequenceNumber + 1); } enet_list_clear(&fragments); for (fragmentNumber = 0, fragmentOffset = 0; fragmentOffset < packet->dataLength; ++fragmentNumber, fragmentOffset += fragmentLength) { if (packet->dataLength - fragmentOffset < fragmentLength) fragmentLength = packet->dataLength - fragmentOffset; fragment = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand)); if (fragment == NULL) { while (!enet_list_empty(&fragments)) { fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments)); enet_free(fragment); } return -1; } fragment->fragmentOffset = fragmentOffset; fragment->fragmentLength = fragmentLength; fragment->packet = packet; fragment->command.header.command = commandNumber; fragment->command.header.channelID = channelID; fragment->command.sendFragment.startSequenceNumber = startSequenceNumber; fragment->command.sendFragment.dataLength = ENET_HOST_TO_NET_16(fragmentLength); fragment->command.sendFragment.fragmentCount = ENET_HOST_TO_NET_32(fragmentCount); fragment->command.sendFragment.fragmentNumber = ENET_HOST_TO_NET_32(fragmentNumber); fragment->command.sendFragment.totalLength = ENET_HOST_TO_NET_32(packet->dataLength); fragment->command.sendFragment.fragmentOffset = ENET_NET_TO_HOST_32(fragmentOffset); enet_list_insert(enet_list_end(&fragments), fragment); } packet->referenceCount += fragmentNumber; while (!enet_list_empty(&fragments)) { fragment = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(&fragments)); enet_peer_setup_outgoing_command(peer, fragment); } return 0; } command.header.channelID = channelID; if ((packet->flags & (ENET_PACKET_FLAG_RELIABLE | ENET_PACKET_FLAG_UNSEQUENCED)) == ENET_PACKET_FLAG_UNSEQUENCED) { command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED; command.sendUnsequenced.dataLength = ENET_HOST_TO_NET_16(packet->dataLength); } else if (packet->flags & ENET_PACKET_FLAG_RELIABLE || channel->outgoingUnreliableSequenceNumber >= 0xFFFF) { command.header.command = ENET_PROTOCOL_COMMAND_SEND_RELIABLE | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE; command.sendReliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength); } else { command.header.command = ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE; command.sendUnreliable.dataLength = ENET_HOST_TO_NET_16(packet->dataLength); } if (enet_peer_queue_outgoing_command(peer, &command, packet, 0, packet->dataLength) == NULL) return -1; return 0; } ENetPacket* enet_peer_receive(ENetPeer* peer, enet_uint8* channelID) { ENetIncomingCommand* incomingCommand; ENetPacket* packet; if (enet_list_empty(&peer->dispatchedCommands)) return NULL; incomingCommand = (ENetIncomingCommand*)enet_list_remove(enet_list_begin(&peer->dispatchedCommands)); if (channelID != NULL) *channelID = incomingCommand->command.header.channelID; packet = incomingCommand->packet; --packet->referenceCount; if (incomingCommand->fragments != NULL) enet_free(incomingCommand->fragments); enet_free(incomingCommand); peer->totalWaitingData -= packet->dataLength; return packet; } static void enet_peer_reset_outgoing_commands(ENetList* queue) { ENetOutgoingCommand* outgoingCommand; while (!enet_list_empty(queue)) { outgoingCommand = (ENetOutgoingCommand*)enet_list_remove(enet_list_begin(queue)); if (outgoingCommand->packet != NULL) { --outgoingCommand->packet->referenceCount; if (outgoingCommand->packet->referenceCount == 0) enet_packet_destroy(outgoingCommand->packet); } enet_free(outgoingCommand); } } static void enet_peer_remove_incoming_commands(ENetList* queue, ENetListIterator startCommand, ENetListIterator endCommand) { ENetListIterator currentCommand; for (currentCommand = startCommand; currentCommand != endCommand;) { ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand; currentCommand = enet_list_next(currentCommand); enet_list_remove(&incomingCommand->incomingCommandList); if (incomingCommand->packet != NULL) { --incomingCommand->packet->referenceCount; if (incomingCommand->packet->referenceCount == 0) enet_packet_destroy(incomingCommand->packet); } if (incomingCommand->fragments != NULL) enet_free(incomingCommand->fragments); enet_free(incomingCommand); } } static void enet_peer_reset_incoming_commands(ENetList* queue) { enet_peer_remove_incoming_commands(queue, enet_list_begin(queue), enet_list_end(queue)); } void enet_peer_reset_queues(ENetPeer* peer) { ENetChannel* channel; if (peer->needsDispatch) { enet_list_remove(&peer->dispatchList); peer->needsDispatch = 0; } while (!enet_list_empty(&peer->acknowledgements)) { enet_free(enet_list_remove(enet_list_begin(&peer->acknowledgements))); } enet_peer_reset_outgoing_commands(&peer->sentReliableCommands); enet_peer_reset_outgoing_commands(&peer->sentUnreliableCommands); enet_peer_reset_outgoing_commands(&peer->outgoingReliableCommands); enet_peer_reset_outgoing_commands(&peer->outgoingUnreliableCommands); enet_peer_reset_incoming_commands(&peer->dispatchedCommands); if (peer->channels != NULL && peer->channelCount > 0) { for (channel = peer->channels; channel < &peer->channels[peer->channelCount]; ++channel) { enet_peer_reset_incoming_commands(&channel->incomingReliableCommands); enet_peer_reset_incoming_commands(&channel->incomingUnreliableCommands); } enet_free(peer->channels); } peer->channels = NULL; peer->channelCount = 0; } void enet_peer_on_connect(ENetPeer* peer) { if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) { if (peer->incomingBandwidth != 0) ++peer->host->bandwidthLimitedPeers; ++peer->host->connectedPeers; } } void enet_peer_on_disconnect(ENetPeer* peer) { if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) { if (peer->incomingBandwidth != 0) --peer->host->bandwidthLimitedPeers; --peer->host->connectedPeers; } } void enet_peer_reset(ENetPeer* peer) { enet_peer_on_disconnect(peer); peer->outgoingPeerID = ENET_PROTOCOL_MAXIMUM_PEER_ID; peer->state = ENET_PEER_STATE_DISCONNECTED; peer->incomingBandwidth = 0; peer->outgoingBandwidth = 0; peer->incomingBandwidthThrottleEpoch = 0; peer->outgoingBandwidthThrottleEpoch = 0; peer->incomingDataTotal = 0; peer->totalDataReceived = 0; peer->outgoingDataTotal = 0; peer->totalDataSent = 0; peer->lastSendTime = 0; peer->lastReceiveTime = 0; peer->nextTimeout = 0; peer->earliestTimeout = 0; peer->packetLossEpoch = 0; peer->packetsSent = 0; peer->totalPacketsSent = 0; peer->packetsLost = 0; peer->totalPacketsLost = 0; peer->packetLoss = 0; peer->packetLossVariance = 0; peer->packetThrottle = ENET_PEER_DEFAULT_PACKET_THROTTLE; peer->packetThrottleLimit = ENET_PEER_PACKET_THROTTLE_SCALE; peer->packetThrottleCounter = 0; peer->packetThrottleEpoch = 0; peer->packetThrottleAcceleration = ENET_PEER_PACKET_THROTTLE_ACCELERATION; peer->packetThrottleDeceleration = ENET_PEER_PACKET_THROTTLE_DECELERATION; peer->packetThrottleInterval = ENET_PEER_PACKET_THROTTLE_INTERVAL; peer->pingInterval = ENET_PEER_PING_INTERVAL; peer->timeoutLimit = ENET_PEER_TIMEOUT_LIMIT; peer->timeoutMinimum = ENET_PEER_TIMEOUT_MINIMUM; peer->timeoutMaximum = ENET_PEER_TIMEOUT_MAXIMUM; peer->smoothedRoundTripTime = 0; peer->lastRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME; peer->lowestRoundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME; peer->lastRoundTripTimeVariance = 0; peer->highestRoundTripTimeVariance = 0; peer->roundTripTime = ENET_PEER_DEFAULT_ROUND_TRIP_TIME; peer->roundTripTimeVariance = 0; peer->mtu = peer->host->mtu; peer->reliableDataInTransit = 0; peer->outgoingReliableSequenceNumber = 0; peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; peer->incomingUnsequencedGroup = 0; peer->outgoingUnsequencedGroup = 0; peer->eventData = 0; peer->totalWaitingData = 0; memset(peer->unsequencedWindow, 0, sizeof(peer->unsequencedWindow)); enet_peer_reset_queues(peer); } void enet_peer_ping(ENetPeer* peer) { ENetProtocol command; if (peer->state != ENET_PEER_STATE_CONNECTED) return; command.header.command = ENET_PROTOCOL_COMMAND_PING | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE; command.header.channelID = 0xFF; enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0); } void enet_peer_ping_interval(ENetPeer* peer, enet_uint32 pingInterval) { peer->pingInterval = pingInterval ? pingInterval : ENET_PEER_PING_INTERVAL; } void enet_peer_timeout(ENetPeer* peer, enet_uint32 timeoutLimit, enet_uint32 timeoutMinimum, enet_uint32 timeoutMaximum) { peer->timeoutLimit = timeoutLimit ? timeoutLimit : ENET_PEER_TIMEOUT_LIMIT; peer->timeoutMinimum = timeoutMinimum ? timeoutMinimum : ENET_PEER_TIMEOUT_MINIMUM; peer->timeoutMaximum = timeoutMaximum ? timeoutMaximum : ENET_PEER_TIMEOUT_MAXIMUM; } void enet_peer_disconnect_now(ENetPeer* peer, enet_uint32 data) { ENetProtocol command; if (peer->state == ENET_PEER_STATE_DISCONNECTED) return; if (peer->state != ENET_PEER_STATE_ZOMBIE && peer->state != ENET_PEER_STATE_DISCONNECTING) { enet_peer_reset_queues(peer); command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT | ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED; command.header.channelID = 0xFF; command.disconnect.data = ENET_HOST_TO_NET_32(data); enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0); enet_host_flush(peer->host); } enet_peer_reset(peer); } void enet_peer_disconnect(ENetPeer* peer, enet_uint32 data) { ENetProtocol command; if (peer->state == ENET_PEER_STATE_DISCONNECTING || peer->state == ENET_PEER_STATE_DISCONNECTED || peer->state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT || peer->state == ENET_PEER_STATE_ZOMBIE) return; enet_peer_reset_queues(peer); command.header.command = ENET_PROTOCOL_COMMAND_DISCONNECT; command.header.channelID = 0xFF; command.disconnect.data = ENET_HOST_TO_NET_32(data); if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE; else command.header.command |= ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED; enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0); if (peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) { enet_peer_on_disconnect(peer); peer->state = ENET_PEER_STATE_DISCONNECTING; } else { enet_host_flush(peer->host); enet_peer_reset(peer); } } void enet_peer_disconnect_later(ENetPeer* peer, enet_uint32 data) { if ((peer->state == ENET_PEER_STATE_CONNECTED || peer->state == ENET_PEER_STATE_DISCONNECT_LATER) && !(enet_list_empty(&peer->outgoingReliableCommands) && enet_list_empty(&peer->outgoingUnreliableCommands) && enet_list_empty(&peer->sentReliableCommands))) { peer->state = ENET_PEER_STATE_DISCONNECT_LATER; peer->eventData = data; } else { enet_peer_disconnect(peer, data); } } ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer* peer, const ENetProtocol* command, enet_uint16 sentTime) { ENetAcknowledgement* acknowledgement; if (command->header.channelID < peer->channelCount) { ENetChannel* channel = &peer->channels[command->header.channelID]; enet_uint16 reliableWindow = command->header.reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; if (command->header.reliableSequenceNumber < channel->incomingReliableSequenceNumber) reliableWindow += ENET_PEER_RELIABLE_WINDOWS; if (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1 && reliableWindow <= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS) return NULL; } acknowledgement = (ENetAcknowledgement*)enet_malloc(sizeof(ENetAcknowledgement)); if (acknowledgement == NULL) return NULL; peer->outgoingDataTotal += sizeof(ENetProtocolAcknowledge); acknowledgement->sentTime = sentTime; acknowledgement->command = *command; enet_list_insert(enet_list_end(&peer->acknowledgements), acknowledgement); return acknowledgement; } void enet_peer_setup_outgoing_command(ENetPeer* peer, ENetOutgoingCommand* outgoingCommand) { ENetChannel* channel = &peer->channels[outgoingCommand->command.header.channelID]; peer->outgoingDataTotal += enet_protocol_command_size(outgoingCommand->command.header.command) + outgoingCommand->fragmentLength; if (outgoingCommand->command.header.channelID == 0xFF) { ++peer->outgoingReliableSequenceNumber; outgoingCommand->reliableSequenceNumber = peer->outgoingReliableSequenceNumber; outgoingCommand->unreliableSequenceNumber = 0; } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) { ++channel->outgoingReliableSequenceNumber; channel->outgoingUnreliableSequenceNumber = 0; outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber; outgoingCommand->unreliableSequenceNumber = 0; } else if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED) { ++peer->outgoingUnsequencedGroup; outgoingCommand->reliableSequenceNumber = 0; outgoingCommand->unreliableSequenceNumber = 0; } else { if (outgoingCommand->fragmentOffset == 0) ++channel->outgoingUnreliableSequenceNumber; outgoingCommand->reliableSequenceNumber = channel->outgoingReliableSequenceNumber; outgoingCommand->unreliableSequenceNumber = channel->outgoingUnreliableSequenceNumber; } outgoingCommand->sendAttempts = 0; outgoingCommand->sentTime = 0; outgoingCommand->roundTripTimeout = 0; outgoingCommand->roundTripTimeoutLimit = 0; outgoingCommand->command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->reliableSequenceNumber); switch (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) { case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE: outgoingCommand->command.sendUnreliable.unreliableSequenceNumber = ENET_HOST_TO_NET_16(outgoingCommand->unreliableSequenceNumber); break; case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED: outgoingCommand->command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16(peer->outgoingUnsequencedGroup); break; default: break; } if (outgoingCommand->command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) enet_list_insert(enet_list_end(&peer->outgoingReliableCommands), outgoingCommand); else enet_list_insert(enet_list_end(&peer->outgoingUnreliableCommands), outgoingCommand); } ENetOutgoingCommand* enet_peer_queue_outgoing_command(ENetPeer* peer, const ENetProtocol* command, ENetPacket* packet, enet_uint32 offset, enet_uint16 length) { ENetOutgoingCommand* outgoingCommand = (ENetOutgoingCommand*)enet_malloc(sizeof(ENetOutgoingCommand)); if (outgoingCommand == NULL) return NULL; outgoingCommand->command = *command; outgoingCommand->fragmentOffset = offset; outgoingCommand->fragmentLength = length; outgoingCommand->packet = packet; if (packet != NULL) ++packet->referenceCount; enet_peer_setup_outgoing_command(peer, outgoingCommand); return outgoingCommand; } void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer* peer, ENetChannel* channel) { ENetListIterator droppedCommand, startCommand, currentCommand; for (droppedCommand = startCommand = currentCommand = enet_list_begin(&channel->incomingUnreliableCommands); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_next(currentCommand)) { ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand; if ((incomingCommand->command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) continue; if (incomingCommand->reliableSequenceNumber == channel->incomingReliableSequenceNumber) { if (incomingCommand->fragmentsRemaining <= 0) { channel->incomingUnreliableSequenceNumber = incomingCommand->unreliableSequenceNumber; continue; } if (startCommand != currentCommand) { enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand)); if (!peer->needsDispatch) { enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList); peer->needsDispatch = 1; } droppedCommand = currentCommand; } else if (droppedCommand != currentCommand) droppedCommand = enet_list_previous(currentCommand); } else { enet_uint16 reliableWindow = incomingCommand->reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; enet_uint16 currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber) reliableWindow += ENET_PEER_RELIABLE_WINDOWS; if (reliableWindow >= currentWindow && reliableWindow < currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1) break; droppedCommand = enet_list_next(currentCommand); if (startCommand != currentCommand) { enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand)); if (!peer->needsDispatch) { enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList); peer->needsDispatch = 1; } } } startCommand = enet_list_next(currentCommand); } if (startCommand != currentCommand) { enet_list_move(enet_list_end(&peer->dispatchedCommands), startCommand, enet_list_previous(currentCommand)); if (!peer->needsDispatch) { enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList); peer->needsDispatch = 1; } droppedCommand = currentCommand; } enet_peer_remove_incoming_commands(&channel->incomingUnreliableCommands, enet_list_begin(&channel->incomingUnreliableCommands), droppedCommand); } void enet_peer_dispatch_incoming_reliable_commands(ENetPeer* peer, ENetChannel* channel) { ENetListIterator currentCommand; for (currentCommand = enet_list_begin(&channel->incomingReliableCommands); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_next(currentCommand)) { ENetIncomingCommand* incomingCommand = (ENetIncomingCommand*)currentCommand; if (incomingCommand->fragmentsRemaining > 0 || incomingCommand->reliableSequenceNumber != (enet_uint16)(channel->incomingReliableSequenceNumber + 1)) break; channel->incomingReliableSequenceNumber = incomingCommand->reliableSequenceNumber; if (incomingCommand->fragmentCount > 0) channel->incomingReliableSequenceNumber += incomingCommand->fragmentCount - 1; } if (currentCommand == enet_list_begin(&channel->incomingReliableCommands)) return; channel->incomingUnreliableSequenceNumber = 0; enet_list_move(enet_list_end(&peer->dispatchedCommands), enet_list_begin(&channel->incomingReliableCommands), enet_list_previous(currentCommand)); if (!peer->needsDispatch) { enet_list_insert(enet_list_end(&peer->host->dispatchQueue), &peer->dispatchList); peer->needsDispatch = 1; } if (!enet_list_empty(&channel->incomingUnreliableCommands)) enet_peer_dispatch_incoming_unreliable_commands(peer, channel); } ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer* peer, const ENetProtocol* command, const void* data, size_t dataLength, enet_uint32 flags, enet_uint32 fragmentCount) { static ENetIncomingCommand dummyCommand; ENetChannel* channel = &peer->channels[command->header.channelID]; enet_uint32 unreliableSequenceNumber = 0, reliableSequenceNumber = 0; enet_uint16 reliableWindow, currentWindow; ENetIncomingCommand* incomingCommand; ENetListIterator currentCommand; ENetPacket* packet = NULL; if (peer->state == ENET_PEER_STATE_DISCONNECT_LATER) goto discardCommand; if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) { reliableSequenceNumber = command->header.reliableSequenceNumber; reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; currentWindow = channel->incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; if (reliableSequenceNumber < channel->incomingReliableSequenceNumber) reliableWindow += ENET_PEER_RELIABLE_WINDOWS; if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1) goto discardCommand; } switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) { case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT: case ENET_PROTOCOL_COMMAND_SEND_RELIABLE: if (reliableSequenceNumber == channel->incomingReliableSequenceNumber) goto discardCommand; for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingReliableCommands)); currentCommand != enet_list_end(&channel->incomingReliableCommands); currentCommand = enet_list_previous(currentCommand)) { incomingCommand = (ENetIncomingCommand*)currentCommand; if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) { if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber) continue; } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) { break; } if (incomingCommand->reliableSequenceNumber <= reliableSequenceNumber) { if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber) break; goto discardCommand; } } break; case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE: case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT: unreliableSequenceNumber = ENET_NET_TO_HOST_16(command->sendUnreliable.unreliableSequenceNumber); if (reliableSequenceNumber == channel->incomingReliableSequenceNumber && unreliableSequenceNumber <= channel->incomingUnreliableSequenceNumber) goto discardCommand; for (currentCommand = enet_list_previous(enet_list_end(&channel->incomingUnreliableCommands)); currentCommand != enet_list_end(&channel->incomingUnreliableCommands); currentCommand = enet_list_previous(currentCommand)) { incomingCommand = (ENetIncomingCommand*)currentCommand; if ((command->header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED) continue; if (reliableSequenceNumber >= channel->incomingReliableSequenceNumber) { if (incomingCommand->reliableSequenceNumber < channel->incomingReliableSequenceNumber) continue; } else if (incomingCommand->reliableSequenceNumber >= channel->incomingReliableSequenceNumber) { break; } if (incomingCommand->reliableSequenceNumber < reliableSequenceNumber) break; if (incomingCommand->reliableSequenceNumber > reliableSequenceNumber) continue; if (incomingCommand->unreliableSequenceNumber <= unreliableSequenceNumber) { if (incomingCommand->unreliableSequenceNumber < unreliableSequenceNumber) break; goto discardCommand; } } break; case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED: currentCommand = enet_list_end(&channel->incomingUnreliableCommands); break; default: goto discardCommand; } if (peer->totalWaitingData >= peer->host->maximumWaitingData) goto notifyError; packet = enet_packet_create(data, dataLength, flags); if (packet == NULL) goto notifyError; incomingCommand = (ENetIncomingCommand*)enet_malloc(sizeof(ENetIncomingCommand)); if (incomingCommand == NULL) goto notifyError; incomingCommand->reliableSequenceNumber = command->header.reliableSequenceNumber; incomingCommand->unreliableSequenceNumber = unreliableSequenceNumber & 0xFFFF; incomingCommand->command = *command; incomingCommand->fragmentCount = fragmentCount; incomingCommand->fragmentsRemaining = fragmentCount; incomingCommand->packet = packet; incomingCommand->fragments = NULL; if (fragmentCount > 0) { if (fragmentCount <= ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT) incomingCommand->fragments = (enet_uint32*)enet_malloc((fragmentCount + 31) / 32 * sizeof(enet_uint32)); if (incomingCommand->fragments == NULL) { enet_free(incomingCommand); goto notifyError; } memset(incomingCommand->fragments, 0, (fragmentCount + 31) / 32 * sizeof(enet_uint32)); } if (packet != NULL) { ++packet->referenceCount; peer->totalWaitingData += packet->dataLength; } enet_list_insert(enet_list_next(currentCommand), incomingCommand); switch (command->header.command & ENET_PROTOCOL_COMMAND_MASK) { case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT: case ENET_PROTOCOL_COMMAND_SEND_RELIABLE: enet_peer_dispatch_incoming_reliable_commands(peer, channel); break; default: enet_peer_dispatch_incoming_unreliable_commands(peer, channel); break; } return incomingCommand; discardCommand: if (fragmentCount > 0) goto notifyError; if (packet != NULL && packet->referenceCount == 0) enet_packet_destroy(packet); return &dummyCommand; notifyError: if (packet != NULL && packet->referenceCount == 0) enet_packet_destroy(packet); return NULL; } // =======================================================================// // ! // ! Host // ! // =======================================================================// ENetHost* enet_host_create(const ENetAddress* address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) { ENetHost* host; ENetPeer* currentPeer; if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID) return NULL; host = (ENetHost*)enet_malloc(sizeof(ENetHost)); if (host == NULL) return NULL; memset(host, 0, sizeof(ENetHost)); host->peers = (ENetPeer*)enet_malloc(peerCount * sizeof(ENetPeer)); if (host->peers == NULL) { enet_free(host); return NULL; } memset(host->peers, 0, peerCount * sizeof(ENetPeer)); host->socket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM); if (host->socket != ENET_SOCKET_NULL) enet_socket_set_option(host->socket, ENET_SOCKOPT_IPV6_V6ONLY, 0); if (host->socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind(host->socket, address) < 0)) { if (host->socket != ENET_SOCKET_NULL) enet_socket_destroy(host->socket); enet_free(host->peers); enet_free(host); return NULL; } enet_socket_set_option(host->socket, ENET_SOCKOPT_NONBLOCK, 1); enet_socket_set_option(host->socket, ENET_SOCKOPT_BROADCAST, 1); enet_socket_set_option(host->socket, ENET_SOCKOPT_RCVBUF, ENET_HOST_RECEIVE_BUFFER_SIZE); enet_socket_set_option(host->socket, ENET_SOCKOPT_SNDBUF, ENET_HOST_SEND_BUFFER_SIZE); if (address != NULL && enet_socket_get_address(host->socket, &host->address) < 0) host->address = *address; if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT) channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT; else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT) channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT; host->randomSeed = (enet_uint32)(size_t)host; host->randomSeed += enet_host_random_seed(); host->randomSeed = (host->randomSeed << 16) | (host->randomSeed >> 16); host->channelLimit = channelLimit; host->incomingBandwidth = incomingBandwidth; host->outgoingBandwidth = outgoingBandwidth; host->bandwidthThrottleEpoch = 0; host->recalculateBandwidthLimits = 0; host->preventConnections = 0; host->mtu = ENET_HOST_DEFAULT_MTU; host->peerCount = peerCount; host->commandCount = 0; host->bufferCount = 0; host->compression = 0; host->compressionBufferSize = 0; host->checksumCallback = NULL; host->receivedAddress.host = ENET_HOST_ANY; host->receivedAddress.port = 0; host->receivedData = NULL; host->receivedDataLength = 0; host->totalSentData = 0; host->totalSentPackets = 0; host->totalReceivedData = 0; host->totalReceivedPackets = 0; host->connectedPeers = 0; host->bandwidthLimitedPeers = 0; host->duplicatePeers = ENET_PROTOCOL_MAXIMUM_PEER_ID; host->maximumPacketSize = ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE; host->maximumWaitingData = ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA; host->interceptCallback = NULL; enet_list_clear(&host->dispatchQueue); for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) { currentPeer->host = host; currentPeer->incomingPeerID = currentPeer - host->peers; currentPeer->outgoingSessionID = currentPeer->incomingSessionID = 0xFF; currentPeer->data = NULL; enet_list_clear(¤tPeer->acknowledgements); enet_list_clear(¤tPeer->sentReliableCommands); enet_list_clear(¤tPeer->sentUnreliableCommands); enet_list_clear(¤tPeer->outgoingReliableCommands); enet_list_clear(¤tPeer->outgoingUnreliableCommands); enet_list_clear(¤tPeer->dispatchedCommands); enet_peer_reset(currentPeer); } return host; } void enet_host_destroy(ENetHost* host) { ENetPeer* currentPeer; if (host == NULL) return; enet_socket_destroy(host->socket); for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) { enet_peer_reset(currentPeer); } enet_free(host->peers); enet_free(host->compressionBuffer); enet_free(host); } void enet_host_enable_compression(ENetHost* host) { if (host == NULL) return; host->compression = 1; } void enet_host_prevent_connections(ENetHost* host, enet_uint8 state) { if (host == NULL) return; host->preventConnections = state; } ENetPeer* enet_host_connect(ENetHost* host, const ENetAddress* address, size_t channelCount, enet_uint32 data) { ENetPeer* currentPeer; ENetChannel* channel; ENetProtocol command; if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT) channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT; else if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT) channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT; for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) { if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED) break; } if (currentPeer >= &host->peers[host->peerCount]) return NULL; currentPeer->channels = (ENetChannel*)enet_malloc(channelCount * sizeof(ENetChannel)); if (currentPeer->channels == NULL) return NULL; currentPeer->channelCount = channelCount; currentPeer->state = ENET_PEER_STATE_CONNECTING; currentPeer->address = *address; currentPeer->connectID = ++host->randomSeed; if (host->outgoingBandwidth == 0) currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; else currentPeer->windowSize = (host->outgoingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; if (currentPeer->windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE) currentPeer->windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE; else if (currentPeer->windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE) currentPeer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE; for (channel = currentPeer->channels; channel < ¤tPeer->channels[channelCount]; ++channel) { channel->outgoingReliableSequenceNumber = 0; channel->outgoingUnreliableSequenceNumber = 0; channel->incomingReliableSequenceNumber = 0; channel->incomingUnreliableSequenceNumber = 0; enet_list_clear(&channel->incomingReliableCommands); enet_list_clear(&channel->incomingUnreliableCommands); channel->usedReliableWindows = 0; memset(channel->reliableWindows, 0, sizeof(channel->reliableWindows)); } command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE; command.header.channelID = 0xFF; command.connect.outgoingPeerID = ENET_HOST_TO_NET_16(currentPeer->incomingPeerID); command.connect.incomingSessionID = currentPeer->incomingSessionID; command.connect.outgoingSessionID = currentPeer->outgoingSessionID; command.connect.mtu = ENET_HOST_TO_NET_32(currentPeer->mtu); command.connect.windowSize = ENET_HOST_TO_NET_32(currentPeer->windowSize); command.connect.channelCount = ENET_HOST_TO_NET_32(channelCount); command.connect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth); command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth); command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32(currentPeer->packetThrottleInterval); command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleAcceleration); command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32(currentPeer->packetThrottleDeceleration); command.connect.connectID = currentPeer->connectID; command.connect.data = ENET_HOST_TO_NET_32(data); enet_peer_queue_outgoing_command(currentPeer, &command, NULL, 0, 0); return currentPeer; } void enet_host_broadcast(ENetHost* host, enet_uint8 channelID, ENetPacket* packet) { ENetPeer* currentPeer; for (currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) { if (currentPeer->state != ENET_PEER_STATE_CONNECTED) continue; enet_peer_send(currentPeer, channelID, packet); } if (packet->referenceCount == 0) enet_packet_destroy(packet); } void enet_host_broadcast_selective(ENetHost* host, enet_uint8 channelID, ENetPacket* packet, ENetPeer** peers, size_t length) { ENetPeer* currentPeer; size_t i; if (host == NULL) return; for (i = 0; i < length; i++) { currentPeer = peers[i]; if (currentPeer == NULL || currentPeer->state != ENET_PEER_STATE_CONNECTED) continue; enet_peer_send(currentPeer, channelID, packet); } if (packet->referenceCount == 0) enet_packet_destroy(packet); } void enet_host_channel_limit(ENetHost* host, size_t channelLimit) { if (!channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT) channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT; else if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT) channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT; host->channelLimit = channelLimit; } void enet_host_bandwidth_limit(ENetHost* host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth) { host->incomingBandwidth = incomingBandwidth; host->outgoingBandwidth = outgoingBandwidth; host->recalculateBandwidthLimits = 1; } void enet_host_bandwidth_throttle(ENetHost* host) { enet_uint32 timeCurrent = enet_time_get(); enet_uint32 elapsedTime = timeCurrent - host->bandwidthThrottleEpoch; enet_uint32 peersRemaining = (enet_uint32)host->connectedPeers; enet_uint32 dataTotal = ~0; enet_uint32 bandwidth = ~0; enet_uint32 throttle = 0; enet_uint32 bandwidthLimit = 0; int needsAdjustment = host->bandwidthLimitedPeers > 0 ? 1 : 0; ENetPeer* peer; ENetProtocol command; if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL) return; if (host->outgoingBandwidth == 0 && host->incomingBandwidth == 0) return; host->bandwidthThrottleEpoch = timeCurrent; if (peersRemaining == 0) return; if (host->outgoingBandwidth != 0) { dataTotal = 0; bandwidth = (host->outgoingBandwidth * elapsedTime) / 1000; for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) { if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) continue; dataTotal += peer->outgoingDataTotal; } } while (peersRemaining > 0 && needsAdjustment != 0) { needsAdjustment = 0; if (dataTotal <= bandwidth) throttle = ENET_PEER_PACKET_THROTTLE_SCALE; else throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal; for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) { enet_uint32 peerBandwidth; if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidth == 0 || peer->outgoingBandwidthThrottleEpoch == timeCurrent) continue; peerBandwidth = (peer->incomingBandwidth * elapsedTime) / 1000; if ((throttle * peer->outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth) continue; peer->packetThrottleLimit = (peerBandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / peer->outgoingDataTotal; if (peer->packetThrottleLimit == 0) peer->packetThrottleLimit = 1; if (peer->packetThrottle > peer->packetThrottleLimit) peer->packetThrottle = peer->packetThrottleLimit; peer->outgoingBandwidthThrottleEpoch = timeCurrent; peer->incomingDataTotal = 0; peer->outgoingDataTotal = 0; needsAdjustment = 1; --peersRemaining; bandwidth -= peerBandwidth; dataTotal -= peerBandwidth; } } if (peersRemaining > 0) { if (dataTotal <= bandwidth) throttle = ENET_PEER_PACKET_THROTTLE_SCALE; else throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal; for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) { if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->outgoingBandwidthThrottleEpoch == timeCurrent) continue; peer->packetThrottleLimit = throttle; if (peer->packetThrottle > peer->packetThrottleLimit) peer->packetThrottle = peer->packetThrottleLimit; peer->incomingDataTotal = 0; peer->outgoingDataTotal = 0; } } if (host->recalculateBandwidthLimits) { host->recalculateBandwidthLimits = 0; peersRemaining = (enet_uint32)host->connectedPeers; bandwidth = host->incomingBandwidth; needsAdjustment = 1; if (bandwidth == 0) { bandwidthLimit = 0; } else { while (peersRemaining > 0 && needsAdjustment != 0) { needsAdjustment = 0; bandwidthLimit = bandwidth / peersRemaining; for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) { if ((peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) || peer->incomingBandwidthThrottleEpoch == timeCurrent) continue; if (peer->outgoingBandwidth > 0 && peer->outgoingBandwidth >= bandwidthLimit) continue; peer->incomingBandwidthThrottleEpoch = timeCurrent; needsAdjustment = 1; --peersRemaining; bandwidth -= peer->outgoingBandwidth; } } } for (peer = host->peers; peer < &host->peers[host->peerCount]; ++peer) { if (peer->state != ENET_PEER_STATE_CONNECTED && peer->state != ENET_PEER_STATE_DISCONNECT_LATER) continue; command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE; command.header.channelID = 0xFF; command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth); if (peer->incomingBandwidthThrottleEpoch == timeCurrent) command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(peer->outgoingBandwidth); else command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32(bandwidthLimit); enet_peer_queue_outgoing_command(peer, &command, NULL, 0, 0); } } } // =======================================================================// // ! // ! Time // ! // =======================================================================// #ifdef _WIN32 static LARGE_INTEGER getFILETIMEoffset() { SYSTEMTIME s; FILETIME f; LARGE_INTEGER t; s.wYear = 1970; s.wMonth = 1; s.wDay = 1; s.wHour = 0; s.wMinute = 0; s.wSecond = 0; s.wMilliseconds = 0; SystemTimeToFileTime(&s, &f); t.QuadPart = f.dwHighDateTime; t.QuadPart <<= 32; t.QuadPart |= f.dwLowDateTime; return t; } int clock_gettime(int X, struct timespec* tv) { LARGE_INTEGER t; FILETIME f; double microseconds; static LARGE_INTEGER offset; static double frequencyToMicroseconds; static int initialized = 0; static BOOL usePerformanceCounter = 0; if (!initialized) { LARGE_INTEGER performanceFrequency; initialized = 1; usePerformanceCounter = QueryPerformanceFrequency(&performanceFrequency); if (usePerformanceCounter) { QueryPerformanceCounter(&offset); frequencyToMicroseconds = (double)performanceFrequency.QuadPart / 1000000.; } else { offset = getFILETIMEoffset(); frequencyToMicroseconds = 10.; } } if (usePerformanceCounter) { QueryPerformanceCounter(&t); } else { GetSystemTimeAsFileTime(&f); t.QuadPart = f.dwHighDateTime; t.QuadPart <<= 32; t.QuadPart |= f.dwLowDateTime; } t.QuadPart -= offset.QuadPart; microseconds = (double)t.QuadPart / frequencyToMicroseconds; t.QuadPart = (LONGLONG)microseconds; tv->tv_sec = (long)(t.QuadPart / 1000000); tv->tv_nsec = t.QuadPart % 1000000 * 1000; return 0; } #elif __APPLE__ && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 && !defined(CLOCK_MONOTONIC) #define CLOCK_MONOTONIC 0 int clock_gettime(int X, struct timespec* ts) { clock_serv_t cclock; mach_timespec_t mts; host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock); clock_get_time(cclock, &mts); mach_port_deallocate(mach_task_self(), cclock); ts->tv_sec = mts.tv_sec; ts->tv_nsec = mts.tv_nsec; return 0; } #endif enet_uint32 enet_time_get() { static enet_uint64 start_time_ns = 0; struct timespec ts; #ifdef CLOCK_MONOTONIC_RAW clock_gettime(CLOCK_MONOTONIC_RAW, &ts); #else clock_gettime(CLOCK_MONOTONIC, &ts); #endif static const enet_uint64 ns_in_s = 1000 * 1000 * 1000; static const enet_uint64 ns_in_ms = 1000 * 1000; enet_uint64 current_time_ns = ts.tv_nsec + (enet_uint64)ts.tv_sec * ns_in_s; enet_uint64 offset_ns = ENET_ATOMIC_READ(&start_time_ns); if (offset_ns == 0) { enet_uint64 want_value = current_time_ns - 1 * ns_in_ms; enet_uint64 old_value = ENET_ATOMIC_CAS(&start_time_ns, 0, want_value); offset_ns = old_value == 0 ? want_value : old_value; } enet_uint64 result_in_ns = current_time_ns - offset_ns; return (enet_uint32)(result_in_ns / ns_in_ms); } // =======================================================================// // ! // ! Extended functionality // ! // =======================================================================// void* enet_packet_get_data(const ENetPacket* packet) { return (void*)packet->data; } int enet_packet_get_length(const ENetPacket* packet) { return packet->dataLength; } void enet_packet_set_free_callback(ENetPacket* packet, const void* callback) { packet->freeCallback = (ENetPacketFreeCallback)callback; } int enet_packet_check_references(const ENetPacket* packet) { return (int)packet->referenceCount; } void enet_packet_dispose(ENetPacket* packet) { if (packet->referenceCount == 0) enet_packet_destroy(packet); } enet_uint32 enet_host_get_peers_count(const ENetHost* host) { return host->connectedPeers; } enet_uint32 enet_host_get_packets_sent(const ENetHost* host) { return host->totalSentPackets; } enet_uint32 enet_host_get_packets_received(const ENetHost* host) { return host->totalReceivedPackets; } enet_uint32 enet_host_get_bytes_sent(const ENetHost* host) { return host->totalSentData; } enet_uint32 enet_host_get_bytes_received(const ENetHost* host) { return host->totalReceivedData; } enet_uint32 enet_peer_get_id(const ENetPeer* peer) { return peer->incomingPeerID; } int enet_peer_get_ip(const ENetPeer* peer, char* ip, size_t ipLength) { return enet_address_get_host_ip(&peer->address, ip, ipLength); } enet_uint16 enet_peer_get_port(const ENetPeer* peer) { return peer->address.port; } enet_uint32 enet_peer_get_mtu(const ENetPeer* peer) { return peer->mtu; } ENetPeerState enet_peer_get_state(const ENetPeer* peer) { return peer->state; } enet_uint32 enet_peer_get_rtt(const ENetPeer* peer) { return peer->smoothedRoundTripTime; } enet_uint32 enet_peer_get_lastsendtime(const ENetPeer* peer) { return peer->lastSendTime; } enet_uint32 enet_peer_get_lastreceivetime(const ENetPeer* peer) { return peer->lastReceiveTime; } enet_uint64 enet_peer_get_packets_sent(const ENetPeer* peer) { return peer->totalPacketsSent; } enet_uint64 enet_peer_get_packets_lost(const ENetPeer* peer) { return peer->totalPacketsLost; } enet_uint64 enet_peer_get_bytes_sent(const ENetPeer* peer) { return peer->totalDataSent; } enet_uint64 enet_peer_get_bytes_received(const ENetPeer* peer) { return peer->totalDataReceived; } void* enet_peer_get_data(const ENetPeer* peer) { return (void*)peer->data; } void enet_peer_set_data(ENetPeer* peer, const void* data) { peer->data = (enet_uint32*)data; } // =======================================================================// // ! // ! Platform Specific (Unix) // ! // =======================================================================// #ifndef _WIN32 int enet_initialize(void) { return 0; } void enet_deinitialize(void) { } enet_uint64 enet_host_random_seed(void) { return (enet_uint64)time(NULL); } int enet_address_set_host_ip(ENetAddress* address, const char* name) { if (!inet_pton(AF_INET6, name, &address->host)) return -1; return 0; } int enet_address_set_host(ENetAddress* address, const char* name) { struct addrinfo hints, * resultList = NULL, * result = NULL; memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; if (getaddrinfo(name, NULL, &hints, &resultList) != 0) return -1; for (result = resultList; result != NULL; result = result->ai_next) { if (result->ai_addr != NULL && result->ai_addrlen >= sizeof(struct sockaddr_in)) { if (result->ai_family == AF_INET) { struct sockaddr_in* sin = (struct sockaddr_in*)result->ai_addr; ((enet_uint32*)&address->host.s6_addr)[0] = 0; ((enet_uint32*)&address->host.s6_addr)[1] = 0; ((enet_uint32*)&address->host.s6_addr)[2] = ENET_HOST_TO_NET_32(0xFFFF); ((enet_uint32*)&address->host.s6_addr)[3] = sin->sin_addr.s_addr; freeaddrinfo(resultList); return 0; } else if (result->ai_family == AF_INET6) { struct sockaddr_in6* sin = (struct sockaddr_in6*)result->ai_addr; address->host = sin->sin6_addr; address->scope = sin->sin6_scope_id; freeaddrinfo(resultList); return 0; } } } if (resultList != NULL) freeaddrinfo(resultList); return enet_address_set_host_ip(address, name); } int enet_address_get_host_ip(const ENetAddress* address, char* name, size_t nameLength) { if (inet_ntop(AF_INET6, &address->host, name, nameLength) == NULL) return -1; return 0; } int enet_address_get_host(const ENetAddress* address, char* name, size_t nameLength) { struct sockaddr_in6 sin; int err; memset(&sin, 0, sizeof(struct sockaddr_in6)); sin.sin6_family = AF_INET6; sin.sin6_port = ENET_HOST_TO_NET_16(address->port); sin.sin6_addr = address->host; sin.sin6_scope_id = address->scope; err = getnameinfo((struct sockaddr*)&sin, sizeof(sin), name, nameLength, NULL, 0, NI_NAMEREQD); if (!err) { if (name != NULL && nameLength > 0 && !memchr(name, '\0', nameLength)) return -1; return 0; } if (err != EAI_NONAME) return -1; return enet_address_get_host_ip(address, name, nameLength); } int enet_socket_bind(ENetSocket socket, const ENetAddress* address) { struct sockaddr_in6 sin; memset(&sin, 0, sizeof(struct sockaddr_in6)); sin.sin6_family = AF_INET6; if (address != NULL) { sin.sin6_port = ENET_HOST_TO_NET_16(address->port); sin.sin6_addr = address->host; sin.sin6_scope_id = address->scope; } else { sin.sin6_port = 0; sin.sin6_addr = ENET_HOST_ANY; sin.sin6_scope_id = 0; } return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)); } int enet_socket_get_address(ENetSocket socket, ENetAddress* address) { struct sockaddr_in6 sin; socklen_t sinLength = sizeof(struct sockaddr_in6); if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1) return -1; address->host = sin.sin6_addr; address->port = ENET_NET_TO_HOST_16(sin.sin6_port); address->scope = sin.sin6_scope_id; return 0; } int enet_socket_listen(ENetSocket socket, int backlog) { return listen(socket, backlog < 0 ? SOMAXCONN : backlog); } ENetSocket enet_socket_create(ENetSocketType type) { return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0); } int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) { int result = -1; switch (option) { case ENET_SOCKOPT_NONBLOCK: result = fcntl(socket, F_SETFL, (value ? O_NONBLOCK : 0) | (fcntl(socket, F_GETFL) & ~O_NONBLOCK)); break; case ENET_SOCKOPT_BROADCAST: result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_REUSEADDR: result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_RCVBUF: result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_SNDBUF: result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_RCVTIMEO: { struct timeval timeVal; timeVal.tv_sec = value / 1000; timeVal.tv_usec = (value % 1000) * 1000; result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeVal, sizeof(struct timeval)); break; } case ENET_SOCKOPT_SNDTIMEO: { struct timeval timeVal; timeVal.tv_sec = value / 1000; timeVal.tv_usec = (value % 1000) * 1000; result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeVal, sizeof(struct timeval)); break; } case ENET_SOCKOPT_NODELAY: result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_IPV6_V6ONLY: result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int)); break; default: break; } return result == -1 ? -1 : 0; } int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) { int result = -1; socklen_t len; switch (option) { case ENET_SOCKOPT_ERROR: len = sizeof(int); result = getsockopt(socket, SOL_SOCKET, SO_ERROR, value, &len); break; default: break; } return result == -1 ? -1 : 0; } int enet_socket_connect(ENetSocket socket, const ENetAddress* address) { struct sockaddr_in6 sin; int result; memset(&sin, 0, sizeof(struct sockaddr_in6)); sin.sin6_family = AF_INET6; sin.sin6_port = ENET_HOST_TO_NET_16(address->port); sin.sin6_addr = address->host; sin.sin6_scope_id = address->scope; result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)); if (result == -1 && errno == EINPROGRESS) return 0; return result; } ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) { int result; struct sockaddr_in6 sin; socklen_t sinLength = sizeof(struct sockaddr_in6); result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL); if (result == -1) return ENET_SOCKET_NULL; if (address != NULL) { address->host = sin.sin6_addr; address->port = ENET_NET_TO_HOST_16(sin.sin6_port); address->scope = sin.sin6_scope_id; } return result; } int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) { return shutdown(socket, (int)how); } void enet_socket_destroy(ENetSocket socket) { if (socket != -1) close(socket); } int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) { struct msghdr msgHdr; struct sockaddr_in6 sin; int sentLength; memset(&msgHdr, 0, sizeof(struct msghdr)); if (address != NULL) { memset(&sin, 0, sizeof(struct sockaddr_in6)); sin.sin6_family = AF_INET6; sin.sin6_port = ENET_HOST_TO_NET_16(address->port); sin.sin6_addr = address->host; sin.sin6_scope_id = address->scope; msgHdr.msg_name = &sin; msgHdr.msg_namelen = sizeof(struct sockaddr_in6); } msgHdr.msg_iov = (struct iovec*)buffers; msgHdr.msg_iovlen = bufferCount; sentLength = sendmsg(socket, &msgHdr, MSG_NOSIGNAL); if (sentLength == -1) { if (errno == EWOULDBLOCK) return 0; return -1; } return sentLength; } int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) { struct msghdr msgHdr; struct sockaddr_in6 sin; int recvLength; memset(&msgHdr, 0, sizeof(struct msghdr)); if (address != NULL) { msgHdr.msg_name = &sin; msgHdr.msg_namelen = sizeof(struct sockaddr_in6); } msgHdr.msg_iov = (struct iovec*)buffers; msgHdr.msg_iovlen = bufferCount; recvLength = recvmsg(socket, &msgHdr, MSG_NOSIGNAL); if (recvLength == -1) { if (errno == EWOULDBLOCK) return 0; return -1; } if (msgHdr.msg_flags & MSG_TRUNC) return -1; if (address != NULL) { address->host = sin.sin6_addr; address->port = ENET_NET_TO_HOST_16(sin.sin6_port); address->scope = sin.sin6_scope_id; } return recvLength; } int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) { struct timeval timeVal; timeVal.tv_sec = timeout / 1000; timeVal.tv_usec = (timeout % 1000) * 1000; return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal); } int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) { struct pollfd pollSocket; int pollCount; pollSocket.fd = socket; pollSocket.events = 0; if (*condition & ENET_SOCKET_WAIT_SEND) pollSocket.events |= POLLOUT; if (*condition & ENET_SOCKET_WAIT_RECEIVE) pollSocket.events |= POLLIN; pollCount = poll(&pollSocket, 1, timeout); if (pollCount < 0) { if (errno == EINTR && *condition & ENET_SOCKET_WAIT_INTERRUPT) { *condition = ENET_SOCKET_WAIT_INTERRUPT; return 0; } return -1; } *condition = ENET_SOCKET_WAIT_NONE; if (pollCount == 0) return 0; if (pollSocket.revents & POLLOUT) *condition |= ENET_SOCKET_WAIT_SEND; if (pollSocket.revents & POLLIN) *condition |= ENET_SOCKET_WAIT_RECEIVE; return 0; } #endif // =======================================================================// // ! // ! Platform Specific (Win) // ! // =======================================================================// #ifdef _WIN32 int enet_initialize(void) { WORD versionRequested = MAKEWORD(1, 1); WSADATA wsaData; if (WSAStartup(versionRequested, &wsaData)) return -1; if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) { WSACleanup(); return -1; } timeBeginPeriod(1); return 0; } void enet_deinitialize(void) { timeEndPeriod(1); WSACleanup(); } enet_uint64 enet_host_random_seed(void) { return (enet_uint64)timeGetTime(); } int enet_address_set_host_ip(ENetAddress* address, const char* name) { enet_uint8 vals[4] = { 0, 0, 0, 0 }; int i; for (i = 0; i < 4; ++i) { const char* next = name + 1; if (*name != '0') { long val = strtol(name, (char**)&next, 10); if (val < 0 || val > 255 || next == name || next - name > 3) return -1; vals[i] = (enet_uint8)val; } if (*next != (i < 3 ? '.' : '\0')) return -1; name = next + 1; } memcpy(&address->host, vals, sizeof(enet_uint32)); return 0; } int enet_address_set_host(ENetAddress* address, const char* name) { struct hostent* hostEntry = NULL; hostEntry = gethostbyname(name); if (hostEntry == NULL || hostEntry->h_addrtype != AF_INET) { if (!inet_pton(AF_INET6, name, &address->host)) return -1; return 0; } ((enet_uint32*)&address->host.s6_addr)[0] = 0; ((enet_uint32*)&address->host.s6_addr)[1] = 0; ((enet_uint32*)&address->host.s6_addr)[2] = ENET_HOST_TO_NET_32(0xFFFF); ((enet_uint32*)&address->host.s6_addr)[3] = *(enet_uint32*)hostEntry->h_addr_list[0]; return 0; } int enet_address_get_host_ip(const ENetAddress* address, char* name, size_t nameLength) { if (inet_ntop(AF_INET6, (PVOID)&address->host, name, nameLength) == NULL) return -1; return 0; } int enet_address_get_host(const ENetAddress* address, char* name, size_t nameLength) { struct in6_addr in; struct hostent* hostEntry = NULL; in = address->host; hostEntry = gethostbyaddr((char*)&in, sizeof(struct in6_addr), AF_INET6); if (hostEntry == NULL) { return enet_address_get_host_ip(address, name, nameLength); } else { size_t hostLen = strlen(hostEntry->h_name); if (hostLen >= nameLength) return -1; memcpy(name, hostEntry->h_name, hostLen + 1); } return 0; } int enet_socket_bind(ENetSocket socket, const ENetAddress* address) { struct sockaddr_in6 sin; memset(&sin, 0, sizeof(struct sockaddr_in6)); sin.sin6_family = AF_INET6; if (address != NULL) { sin.sin6_port = ENET_HOST_TO_NET_16(address->port); sin.sin6_addr = address->host; sin.sin6_scope_id = address->scope; } else { sin.sin6_port = 0; sin.sin6_addr = in6addr_any; sin.sin6_scope_id = 0; } return bind(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)) == SOCKET_ERROR ? -1 : 0; } int enet_socket_get_address(ENetSocket socket, ENetAddress* address) { struct sockaddr_in6 sin; int sinLength = sizeof(struct sockaddr_in6); if (getsockname(socket, (struct sockaddr*)&sin, &sinLength) == -1) return -1; address->host = sin.sin6_addr; address->port = ENET_NET_TO_HOST_16(sin.sin6_port); address->scope = sin.sin6_scope_id; return 0; } int enet_socket_listen(ENetSocket socket, int backlog) { return listen(socket, backlog < 0 ? SOMAXCONN : backlog) == SOCKET_ERROR ? -1 : 0; } ENetSocket enet_socket_create(ENetSocketType type) { return socket(PF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0); } int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) { int result = SOCKET_ERROR; switch (option) { case ENET_SOCKOPT_NONBLOCK: { u_long nonBlocking = (u_long)value; result = ioctlsocket(socket, FIONBIO, &nonBlocking); break; } case ENET_SOCKOPT_BROADCAST: result = setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_REUSEADDR: result = setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_RCVBUF: result = setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_SNDBUF: result = setsockopt(socket, SOL_SOCKET, SO_SNDBUF, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_RCVTIMEO: result = setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_SNDTIMEO: result = setsockopt(socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_NODELAY: result = setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*)&value, sizeof(int)); break; case ENET_SOCKOPT_IPV6_V6ONLY: result = setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&value, sizeof(int)); break; default: break; } return result == SOCKET_ERROR ? -1 : 0; } int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int* value) { int result = SOCKET_ERROR, len; switch (option) { case ENET_SOCKOPT_ERROR: len = sizeof(int); result = getsockopt(socket, SOL_SOCKET, SO_ERROR, (char*)value, &len); break; default: break; } return result == SOCKET_ERROR ? -1 : 0; } int enet_socket_connect(ENetSocket socket, const ENetAddress* address) { struct sockaddr_in6 sin; int result; memset(&sin, 0, sizeof(struct sockaddr_in6)); sin.sin6_family = AF_INET6; sin.sin6_port = ENET_HOST_TO_NET_16(address->port); sin.sin6_addr = address->host; sin.sin6_scope_id = address->scope; result = connect(socket, (struct sockaddr*)&sin, sizeof(struct sockaddr_in6)); if (result == SOCKET_ERROR && WSAGetLastError() != WSAEWOULDBLOCK) return -1; return 0; } ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress* address) { SOCKET result; struct sockaddr_in6 sin; int sinLength = sizeof(struct sockaddr_in6); result = accept(socket, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL); if (result == INVALID_SOCKET) return ENET_SOCKET_NULL; if (address != NULL) { address->host = sin.sin6_addr; address->port = ENET_NET_TO_HOST_16(sin.sin6_port); address->scope = sin.sin6_scope_id; } return result; } int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) { return shutdown(socket, (int)how) == SOCKET_ERROR ? -1 : 0; } void enet_socket_destroy(ENetSocket socket) { if (socket != INVALID_SOCKET) closesocket(socket); } int enet_socket_send(ENetSocket socket, const ENetAddress* address, const ENetBuffer* buffers, size_t bufferCount) { struct sockaddr_in6 sin; DWORD sentLength; if (address != NULL) { memset(&sin, 0, sizeof(struct sockaddr_in6)); sin.sin6_family = AF_INET6; sin.sin6_port = ENET_HOST_TO_NET_16(address->port); sin.sin6_addr = address->host; sin.sin6_scope_id = address->scope; } if (WSASendTo(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &sentLength, 0, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? sizeof(struct sockaddr_in6) : 0, NULL, NULL) == SOCKET_ERROR) return (WSAGetLastError() == WSAEWOULDBLOCK) ? 0 : 1; return (int)sentLength; } int enet_socket_receive(ENetSocket socket, ENetAddress* address, ENetBuffer* buffers, size_t bufferCount) { INT sinLength = sizeof(struct sockaddr_in6); DWORD flags = 0, recvLength; struct sockaddr_in6 sin; if (WSARecvFrom(socket, (LPWSABUF)buffers, (DWORD)bufferCount, &recvLength, &flags, address != NULL ? (struct sockaddr*)&sin : NULL, address != NULL ? &sinLength : NULL, NULL, NULL) == SOCKET_ERROR) { switch (WSAGetLastError()) { case WSAEWOULDBLOCK: case WSAECONNRESET: return 0; } return -1; } if (flags & MSG_PARTIAL) return -1; if (address != NULL) { address->host = sin.sin6_addr; address->port = ENET_NET_TO_HOST_16(sin.sin6_port); address->scope = sin.sin6_scope_id; } return (int)recvLength; } int enet_socket_set_select(ENetSocket maxSocket, ENetSocketSet* readSet, ENetSocketSet* writeSet, enet_uint32 timeout) { struct timeval timeVal; timeVal.tv_sec = timeout / 1000; timeVal.tv_usec = (timeout % 1000) * 1000; return select(maxSocket + 1, readSet, writeSet, NULL, &timeVal); } int enet_socket_wait(ENetSocket socket, enet_uint32* condition, enet_uint64 timeout) { fd_set readSet, writeSet; struct timeval timeVal; int selectCount; timeVal.tv_sec = timeout / 1000; timeVal.tv_usec = (timeout % 1000) * 1000; FD_ZERO(&readSet); FD_ZERO(&writeSet); if (*condition & ENET_SOCKET_WAIT_SEND) FD_SET(socket, &writeSet); if (*condition & ENET_SOCKET_WAIT_RECEIVE) FD_SET(socket, &readSet); selectCount = select(socket + 1, &readSet, &writeSet, NULL, &timeVal); if (selectCount < 0) return -1; *condition = ENET_SOCKET_WAIT_NONE; if (selectCount == 0) return 0; if (FD_ISSET(socket, &writeSet)) *condition |= ENET_SOCKET_WAIT_SEND; if (FD_ISSET(socket, &readSet)) *condition |= ENET_SOCKET_WAIT_RECEIVE; return 0; } #endif #ifdef __cplusplus } #endif #endif #endif