mirror of
https://github.com/lsalzman/enet
synced 2024-11-21 14:29:05 -07:00
1480 lines
51 KiB
C
1480 lines
51 KiB
C
/**
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@file protocol.c
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@brief ENet protocol functions
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*/
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#include <stdio.h>
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#include <string.h>
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#define ENET_BUILDING_LIB 1
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#include "enet/utility.h"
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#include "enet/time.h"
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#include "enet/enet.h"
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static enet_uint32 timeCurrent;
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static size_t commandSizes [ENET_PROTOCOL_COMMAND_COUNT] =
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{
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0,
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sizeof (ENetProtocolAcknowledge),
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sizeof (ENetProtocolConnect),
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sizeof (ENetProtocolVerifyConnect),
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sizeof (ENetProtocolDisconnect),
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sizeof (ENetProtocolPing),
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sizeof (ENetProtocolSendReliable),
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sizeof (ENetProtocolSendUnreliable),
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sizeof (ENetProtocolSendFragment),
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sizeof (ENetProtocolSendUnsequenced),
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sizeof (ENetProtocolBandwidthLimit),
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sizeof (ENetProtocolThrottleConfigure),
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};
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size_t
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enet_protocol_command_size (enet_uint8 commandNumber)
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{
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return commandSizes [commandNumber & ENET_PROTOCOL_COMMAND_MASK];
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}
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static int
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enet_protocol_dispatch_incoming_commands (ENetHost * host, ENetEvent * event)
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{
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ENetPeer * currentPeer = host -> lastServicedPeer;
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ENetChannel * channel;
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do
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{
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++ currentPeer;
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if (currentPeer >= & host -> peers [host -> peerCount])
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currentPeer = host -> peers;
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switch (currentPeer -> state)
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{
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case ENET_PEER_STATE_CONNECTION_PENDING:
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case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
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currentPeer -> state = ENET_PEER_STATE_CONNECTED;
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event -> type = ENET_EVENT_TYPE_CONNECT;
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event -> peer = currentPeer;
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return 1;
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case ENET_PEER_STATE_ZOMBIE:
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host -> recalculateBandwidthLimits = 1;
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event -> type = ENET_EVENT_TYPE_DISCONNECT;
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event -> peer = currentPeer;
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event -> data = currentPeer -> disconnectData;
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enet_peer_reset (currentPeer);
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host -> lastServicedPeer = currentPeer;
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return 1;
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}
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if (currentPeer -> state != ENET_PEER_STATE_CONNECTED)
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continue;
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for (channel = currentPeer -> channels;
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channel < & currentPeer -> channels [currentPeer -> channelCount];
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++ channel)
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{
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if (enet_list_empty (& channel -> incomingReliableCommands) &&
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enet_list_empty (& channel -> incomingUnreliableCommands))
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continue;
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event -> packet = enet_peer_receive (currentPeer, channel - currentPeer -> channels);
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if (event -> packet == NULL)
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continue;
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event -> type = ENET_EVENT_TYPE_RECEIVE;
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event -> peer = currentPeer;
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event -> channelID = (enet_uint8) (channel - currentPeer -> channels);
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host -> lastServicedPeer = currentPeer;
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return 1;
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}
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} while (currentPeer != host -> lastServicedPeer);
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return 0;
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}
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static void
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enet_protocol_notify_connect (ENetHost * host, ENetPeer * peer, ENetEvent * event)
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{
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host -> recalculateBandwidthLimits = 1;
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if (event == NULL)
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peer -> state = (peer -> state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
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else
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{
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peer -> state = ENET_PEER_STATE_CONNECTED;
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event -> type = ENET_EVENT_TYPE_CONNECT;
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event -> peer = peer;
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}
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}
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static void
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enet_protocol_notify_disconnect (ENetHost * host, ENetPeer * peer, ENetEvent * event)
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{
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if (peer -> state >= ENET_PEER_STATE_CONNECTION_PENDING)
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host -> recalculateBandwidthLimits = 1;
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if (peer -> state != ENET_PEER_STATE_CONNECTING && peer -> state < ENET_PEER_STATE_CONNECTION_SUCCEEDED)
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enet_peer_reset (peer);
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else
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if (event == NULL)
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peer -> state = ENET_PEER_STATE_ZOMBIE;
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else
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{
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event -> type = ENET_EVENT_TYPE_DISCONNECT;
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event -> peer = peer;
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event -> data = 0;
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enet_peer_reset (peer);
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}
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}
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static void
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enet_protocol_remove_sent_unreliable_commands (ENetPeer * peer)
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{
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ENetOutgoingCommand * outgoingCommand;
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while (! enet_list_empty (& peer -> sentUnreliableCommands))
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{
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outgoingCommand = (ENetOutgoingCommand *) enet_list_front (& peer -> sentUnreliableCommands);
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enet_list_remove (& outgoingCommand -> outgoingCommandList);
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if (outgoingCommand -> packet != NULL)
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{
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-- outgoingCommand -> packet -> referenceCount;
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if (outgoingCommand -> packet -> referenceCount == 0)
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enet_packet_destroy (outgoingCommand -> packet);
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}
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enet_free (outgoingCommand);
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}
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}
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static ENetProtocolCommand
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enet_protocol_remove_sent_reliable_command (ENetPeer * peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID)
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{
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ENetOutgoingCommand * outgoingCommand;
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ENetListIterator currentCommand;
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ENetProtocolCommand commandNumber;
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for (currentCommand = enet_list_begin (& peer -> sentReliableCommands);
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currentCommand != enet_list_end (& peer -> sentReliableCommands);
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currentCommand = enet_list_next (currentCommand))
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{
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outgoingCommand = (ENetOutgoingCommand *) currentCommand;
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if (outgoingCommand -> reliableSequenceNumber == reliableSequenceNumber &&
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outgoingCommand -> command.header.channelID == channelID)
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break;
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}
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if (currentCommand == enet_list_end (& peer -> sentReliableCommands))
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return ENET_PROTOCOL_COMMAND_NONE;
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commandNumber = outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK;
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enet_list_remove (& outgoingCommand -> outgoingCommandList);
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if (outgoingCommand -> packet != NULL)
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{
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peer -> reliableDataInTransit -= outgoingCommand -> fragmentLength;
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-- outgoingCommand -> packet -> referenceCount;
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if (outgoingCommand -> packet -> referenceCount == 0)
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enet_packet_destroy (outgoingCommand -> packet);
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}
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enet_free (outgoingCommand);
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if (enet_list_empty (& peer -> sentReliableCommands))
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return commandNumber;
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outgoingCommand = (ENetOutgoingCommand *) enet_list_front (& peer -> sentReliableCommands);
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peer -> nextTimeout = outgoingCommand -> sentTime + outgoingCommand -> roundTripTimeout;
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return commandNumber;
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}
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static ENetPeer *
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enet_protocol_handle_connect (ENetHost * host, ENetProtocolHeader * header, ENetProtocol * command)
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{
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enet_uint16 mtu;
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enet_uint32 windowSize;
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ENetChannel * channel;
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size_t channelCount;
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ENetPeer * currentPeer;
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ENetProtocol verifyCommand;
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#ifdef USE_CRC32
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{
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enet_uint32 crc = header -> checksum;
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ENetBuffer buffer;
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command -> header.reliableSequenceNumber = ENET_HOST_TO_NET_16 (command -> header.reliableSequenceNumber);
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header -> checksum = command -> connect.sessionID;
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buffer.data = host -> receivedData;
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buffer.dataLength = host -> receivedDataLength;
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if (enet_crc32 (& buffer, 1) != crc)
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return NULL;
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command -> header.reliableSequenceNumber = ENET_NET_TO_HOST_16 (command -> header.reliableSequenceNumber);
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}
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#endif
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channelCount = ENET_NET_TO_HOST_32 (command -> connect.channelCount);
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if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT ||
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channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
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return NULL;
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for (currentPeer = host -> peers;
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currentPeer < & host -> peers [host -> peerCount];
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++ currentPeer)
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{
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if (currentPeer -> state != ENET_PEER_STATE_DISCONNECTED &&
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currentPeer -> address.host == host -> receivedAddress.host &&
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currentPeer -> address.port == host -> receivedAddress.port &&
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currentPeer -> sessionID == command -> connect.sessionID)
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return NULL;
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}
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for (currentPeer = host -> peers;
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currentPeer < & host -> peers [host -> peerCount];
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++ currentPeer)
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{
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if (currentPeer -> state == ENET_PEER_STATE_DISCONNECTED)
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break;
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}
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if (currentPeer >= & host -> peers [host -> peerCount])
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return NULL;
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currentPeer -> state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
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currentPeer -> sessionID = command -> connect.sessionID;
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currentPeer -> address = host -> receivedAddress;
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currentPeer -> outgoingPeerID = ENET_NET_TO_HOST_16 (command -> connect.outgoingPeerID);
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currentPeer -> incomingBandwidth = ENET_NET_TO_HOST_32 (command -> connect.incomingBandwidth);
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currentPeer -> outgoingBandwidth = ENET_NET_TO_HOST_32 (command -> connect.outgoingBandwidth);
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currentPeer -> packetThrottleInterval = ENET_NET_TO_HOST_32 (command -> connect.packetThrottleInterval);
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currentPeer -> packetThrottleAcceleration = ENET_NET_TO_HOST_32 (command -> connect.packetThrottleAcceleration);
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currentPeer -> packetThrottleDeceleration = ENET_NET_TO_HOST_32 (command -> connect.packetThrottleDeceleration);
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currentPeer -> channels = (ENetChannel *) enet_malloc (channelCount * sizeof (ENetChannel));
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currentPeer -> channelCount = channelCount;
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for (channel = currentPeer -> channels;
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channel < & currentPeer -> channels [channelCount];
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++ channel)
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{
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channel -> outgoingReliableSequenceNumber = 0;
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channel -> outgoingUnreliableSequenceNumber = 0;
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channel -> incomingReliableSequenceNumber = 0;
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channel -> incomingUnreliableSequenceNumber = 0;
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enet_list_clear (& channel -> incomingReliableCommands);
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enet_list_clear (& channel -> incomingUnreliableCommands);
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}
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mtu = ENET_NET_TO_HOST_16 (command -> connect.mtu);
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if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
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mtu = ENET_PROTOCOL_MINIMUM_MTU;
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else
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if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
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mtu = ENET_PROTOCOL_MAXIMUM_MTU;
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currentPeer -> mtu = mtu;
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if (host -> outgoingBandwidth == 0 &&
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currentPeer -> incomingBandwidth == 0)
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currentPeer -> windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
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else
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if (host -> outgoingBandwidth == 0 ||
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currentPeer -> incomingBandwidth == 0)
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currentPeer -> windowSize = (ENET_MAX (host -> outgoingBandwidth, currentPeer -> incomingBandwidth) /
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ENET_PEER_WINDOW_SIZE_SCALE) *
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ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
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else
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currentPeer -> windowSize = (ENET_MIN (host -> outgoingBandwidth, currentPeer -> incomingBandwidth) /
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ENET_PEER_WINDOW_SIZE_SCALE) *
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ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
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if (currentPeer -> windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
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currentPeer -> windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
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else
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if (currentPeer -> windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
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currentPeer -> windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
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if (host -> incomingBandwidth == 0)
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windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
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else
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windowSize = (host -> incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) *
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ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
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if (windowSize > ENET_NET_TO_HOST_32 (command -> connect.windowSize))
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windowSize = ENET_NET_TO_HOST_32 (command -> connect.windowSize);
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if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
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windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
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else
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if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
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windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
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verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
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verifyCommand.header.channelID = 0xFF;
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verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16 (currentPeer -> incomingPeerID);
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verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_16 (currentPeer -> mtu);
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verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32 (windowSize);
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verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32 (channelCount);
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verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32 (host -> incomingBandwidth);
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verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32 (host -> outgoingBandwidth);
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verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32 (currentPeer -> packetThrottleInterval);
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verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32 (currentPeer -> packetThrottleAcceleration);
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verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32 (currentPeer -> packetThrottleDeceleration);
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enet_peer_queue_outgoing_command (currentPeer, & verifyCommand, NULL, 0, 0);
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return currentPeer;
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}
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static int
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enet_protocol_handle_send_reliable (ENetHost * host, ENetPeer * peer, const ENetProtocol * command, enet_uint8 ** currentData)
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{
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ENetPacket * packet;
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size_t dataLength;
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if (command -> header.channelID >= peer -> channelCount ||
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(peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER))
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return -1;
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dataLength = ENET_NET_TO_HOST_16 (command -> sendReliable.dataLength);
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* currentData += dataLength;
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if (* currentData > & host -> receivedData [host -> receivedDataLength])
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return -1;
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packet = enet_packet_create ((const enet_uint8 *) command + sizeof (ENetProtocolSendReliable),
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dataLength,
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ENET_PACKET_FLAG_RELIABLE);
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if (packet == NULL)
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return -1;
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enet_peer_queue_incoming_command (peer, command, packet, 0);
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return 0;
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}
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static int
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enet_protocol_handle_send_unsequenced (ENetHost * host, ENetPeer * peer, const ENetProtocol * command, enet_uint8 ** currentData)
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{
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ENetPacket * packet;
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enet_uint32 unsequencedGroup, index;
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size_t dataLength;
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if (command -> header.channelID >= peer -> channelCount ||
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(peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER))
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return -1;
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dataLength = ENET_NET_TO_HOST_16 (command -> sendUnsequenced.dataLength);
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* currentData += dataLength;
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if (* currentData > & host -> receivedData [host -> receivedDataLength])
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return -1;
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unsequencedGroup = ENET_NET_TO_HOST_16 (command -> sendUnsequenced.unsequencedGroup);
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index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
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if (unsequencedGroup >= peer -> incomingUnsequencedGroup + ENET_PEER_UNSEQUENCED_WINDOW_SIZE ||
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peer -> incomingUnsequencedGroup >= 0xF000 && unsequencedGroup < 0x1000)
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{
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peer -> incomingUnsequencedGroup = unsequencedGroup - index;
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memset (peer -> unsequencedWindow, 0, sizeof (peer -> unsequencedWindow));
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}
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else
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if (unsequencedGroup < peer -> incomingUnsequencedGroup ||
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peer -> unsequencedWindow [index / 32] & (1 << (index % 32)))
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return 0;
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peer -> unsequencedWindow [index / 32] |= 1 << (index % 32);
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packet = enet_packet_create ((const enet_uint8 *) command + sizeof (ENetProtocolSendUnsequenced),
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dataLength,
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ENET_PACKET_FLAG_UNSEQUENCED);
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if (packet == NULL)
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return -1;
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enet_peer_queue_incoming_command (peer, command, packet, 0);
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return 0;
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}
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static int
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enet_protocol_handle_send_unreliable (ENetHost * host, ENetPeer * peer, const ENetProtocol * command, enet_uint8 ** currentData)
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{
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ENetPacket * packet;
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size_t dataLength;
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if (command -> header.channelID >= peer -> channelCount ||
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(peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER))
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return -1;
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dataLength = ENET_NET_TO_HOST_16 (command -> sendUnreliable.dataLength);
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* currentData += dataLength;
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if (* currentData > & host -> receivedData [host -> receivedDataLength])
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return -1;
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packet = enet_packet_create ((const enet_uint8 *) command + sizeof (ENetProtocolSendUnreliable),
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dataLength,
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0);
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if (packet == NULL)
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return -1;
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enet_peer_queue_incoming_command (peer, command, packet, 0);
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return 0;
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}
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static int
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enet_protocol_handle_send_fragment (ENetHost * host, ENetPeer * peer, const ENetProtocol * command, enet_uint8 ** currentData)
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{
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enet_uint32 fragmentNumber,
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fragmentCount,
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fragmentOffset,
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fragmentLength,
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startSequenceNumber,
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totalLength;
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ENetChannel * channel;
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ENetListIterator currentCommand;
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ENetIncomingCommand * startCommand;
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if (command -> header.channelID >= peer -> channelCount ||
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(peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER))
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return -1;
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fragmentLength = ENET_NET_TO_HOST_16 (command -> sendFragment.dataLength);
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* currentData += fragmentLength;
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if (* currentData > & host -> receivedData [host -> receivedDataLength])
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return -1;
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channel = & peer -> channels [command -> header.channelID];
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startSequenceNumber = ENET_NET_TO_HOST_16 (command -> sendFragment.startSequenceNumber);
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if (channel -> incomingReliableSequenceNumber >= 0xF000 && startSequenceNumber < 0x1000)
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startSequenceNumber += 0x10000;
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if (startSequenceNumber < channel -> incomingReliableSequenceNumber ||
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(channel -> incomingReliableSequenceNumber < 0x1000 && (startSequenceNumber & 0xFFFF) >= 0xF000))
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return 0;
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fragmentNumber = ENET_NET_TO_HOST_32 (command -> sendFragment.fragmentNumber);
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fragmentCount = ENET_NET_TO_HOST_32 (command -> sendFragment.fragmentCount);
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fragmentOffset = ENET_NET_TO_HOST_32 (command -> sendFragment.fragmentOffset);
|
|
totalLength = ENET_NET_TO_HOST_32 (command -> sendFragment.totalLength);
|
|
|
|
if (fragmentOffset >= totalLength ||
|
|
fragmentOffset + fragmentLength > totalLength ||
|
|
fragmentNumber >= fragmentCount)
|
|
return -1;
|
|
|
|
for (currentCommand = enet_list_previous (enet_list_end (& channel -> incomingReliableCommands));
|
|
currentCommand != enet_list_end (& channel -> incomingReliableCommands);
|
|
currentCommand = enet_list_previous (currentCommand))
|
|
{
|
|
startCommand = (ENetIncomingCommand *) currentCommand;
|
|
|
|
if ((startCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_FRAGMENT &&
|
|
startCommand -> command.sendFragment.startSequenceNumber == (startSequenceNumber & 0xFFFF))
|
|
break;
|
|
}
|
|
|
|
if (currentCommand == enet_list_end (& channel -> incomingReliableCommands))
|
|
{
|
|
ENetProtocol hostCommand = * command;
|
|
ENetPacket * packet = enet_packet_create (NULL, totalLength, ENET_PACKET_FLAG_RELIABLE);
|
|
if (packet == NULL)
|
|
return -1;
|
|
|
|
hostCommand.header.reliableSequenceNumber = startSequenceNumber;
|
|
hostCommand.sendFragment.startSequenceNumber = startSequenceNumber;
|
|
hostCommand.sendFragment.dataLength = fragmentLength;
|
|
hostCommand.sendFragment.fragmentNumber = fragmentNumber;
|
|
hostCommand.sendFragment.fragmentCount = fragmentCount;
|
|
hostCommand.sendFragment.fragmentOffset = fragmentOffset;
|
|
hostCommand.sendFragment.totalLength = totalLength;
|
|
|
|
startCommand = enet_peer_queue_incoming_command (peer, & hostCommand, packet, fragmentCount);
|
|
}
|
|
else
|
|
if (totalLength != startCommand -> packet -> dataLength ||
|
|
fragmentCount != startCommand -> fragmentCount)
|
|
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);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
enet_protocol_handle_ping (ENetHost * host, ENetPeer * peer, const ENetProtocol * command)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
enet_protocol_handle_bandwidth_limit (ENetHost * host, ENetPeer * peer, const ENetProtocol * command)
|
|
{
|
|
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 -> outgoingBandwidth == 0)
|
|
peer -> windowSize = ENET_PROTOCOL_MAXIMUM_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)
|
|
{
|
|
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)
|
|
{
|
|
enet_peer_reset_queues (peer);
|
|
|
|
if (peer -> state == ENET_PEER_STATE_CONNECTION_SUCCEEDED)
|
|
peer -> state = 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)
|
|
peer -> state = ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT;
|
|
else
|
|
peer -> state = ENET_PEER_STATE_ZOMBIE;
|
|
|
|
peer -> disconnectData = 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;
|
|
|
|
receivedSentTime = ENET_NET_TO_HOST_16 (command -> acknowledge.receivedSentTime);
|
|
receivedSentTime |= timeCurrent & 0xFFFF0000;
|
|
if ((receivedSentTime & 0x8000) > (timeCurrent & 0x8000))
|
|
receivedSentTime -= 0x10000;
|
|
|
|
if (ENET_TIME_LESS (timeCurrent, receivedSentTime))
|
|
return 0;
|
|
|
|
peer -> lastReceiveTime = timeCurrent;
|
|
peer -> earliestTimeout = 0;
|
|
|
|
roundTripTime = ENET_TIME_DIFFERENCE (timeCurrent, receivedSentTime);
|
|
|
|
enet_peer_throttle (peer, roundTripTime);
|
|
|
|
peer -> roundTripTimeVariance -= peer -> roundTripTimeVariance / 4;
|
|
|
|
if (roundTripTime >= peer -> roundTripTime)
|
|
{
|
|
peer -> roundTripTime += (roundTripTime - peer -> roundTripTime) / 8;
|
|
peer -> roundTripTimeVariance += (roundTripTime - peer -> roundTripTime) / 4;
|
|
}
|
|
else
|
|
{
|
|
peer -> roundTripTime -= (peer -> roundTripTime - roundTripTime) / 8;
|
|
peer -> roundTripTimeVariance += (peer -> roundTripTime - roundTripTime) / 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(timeCurrent, peer -> packetThrottleEpoch) >= peer -> packetThrottleInterval)
|
|
{
|
|
peer -> lastRoundTripTime = peer -> lowestRoundTripTime;
|
|
peer -> lastRoundTripTimeVariance = peer -> highestRoundTripTimeVariance;
|
|
peer -> lowestRoundTripTime = peer -> roundTripTime;
|
|
peer -> highestRoundTripTimeVariance = peer -> roundTripTimeVariance;
|
|
peer -> packetThrottleEpoch = timeCurrent;
|
|
}
|
|
|
|
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 -> disconnectData);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
enet_protocol_handle_verify_connect (ENetHost * host, ENetEvent * event, ENetPeer * peer, const ENetProtocol * command)
|
|
{
|
|
enet_uint16 mtu;
|
|
enet_uint32 windowSize;
|
|
|
|
if (peer -> state != ENET_PEER_STATE_CONNECTING)
|
|
return -1;
|
|
|
|
if (ENET_NET_TO_HOST_32 (command -> verifyConnect.channelCount) != peer -> channelCount ||
|
|
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)
|
|
{
|
|
peer -> state = ENET_PEER_STATE_ZOMBIE;
|
|
|
|
return -1;
|
|
}
|
|
|
|
enet_protocol_remove_sent_reliable_command (peer, 1, 0xFF);
|
|
|
|
peer -> outgoingPeerID = ENET_NET_TO_HOST_16 (command -> verifyConnect.outgoingPeerID);
|
|
|
|
mtu = ENET_NET_TO_HOST_16 (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;
|
|
|
|
if (host -> receivedDataLength < sizeof (ENetProtocolHeader))
|
|
return 0;
|
|
|
|
header = (ENetProtocolHeader *) host -> receivedData;
|
|
|
|
peerID = ENET_NET_TO_HOST_16 (header -> peerID);
|
|
flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
|
|
peerID &= ~ ENET_PROTOCOL_HEADER_FLAG_MASK;
|
|
|
|
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 ||
|
|
(host -> receivedAddress.host != peer -> address.host &&
|
|
peer -> address.host != ENET_HOST_BROADCAST))
|
|
return 0;
|
|
|
|
#ifdef USE_CRC32
|
|
{
|
|
enet_uint32 crc = header -> checksum;
|
|
ENetBuffer buffer;
|
|
|
|
header -> checksum = peer -> sessionID;
|
|
|
|
buffer.data = host -> receivedData;
|
|
buffer.dataLength = host -> receivedDataLength;
|
|
|
|
if (enet_crc32 (& buffer, 1) != crc)
|
|
return 0;
|
|
}
|
|
#else
|
|
if (header -> checksum != peer -> sessionID)
|
|
return 0;
|
|
#endif
|
|
|
|
peer -> address.host = host -> receivedAddress.host;
|
|
peer -> address.port = host -> receivedAddress.port;
|
|
peer -> incomingDataTotal += host -> receivedDataLength;
|
|
}
|
|
|
|
headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof (ENetProtocolHeader) : (size_t) & ((ENetProtocolHeader *) 0) -> sentTime);
|
|
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)
|
|
break;
|
|
|
|
command -> header.reliableSequenceNumber = ENET_NET_TO_HOST_16 (command -> header.reliableSequenceNumber);
|
|
|
|
switch (command -> header.command & ENET_PROTOCOL_COMMAND_MASK)
|
|
{
|
|
case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
|
|
if (enet_protocol_handle_acknowledge (host, event, peer, command))
|
|
goto commandError;
|
|
break;
|
|
|
|
case ENET_PROTOCOL_COMMAND_CONNECT:
|
|
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, & currentData))
|
|
goto commandError;
|
|
break;
|
|
|
|
case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
|
|
if (enet_protocol_handle_send_unreliable (host, peer, command, & currentData))
|
|
goto commandError;
|
|
break;
|
|
|
|
case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
|
|
if (enet_protocol_handle_send_unsequenced (host, peer, command, & currentData))
|
|
goto commandError;
|
|
break;
|
|
|
|
case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
|
|
if (enet_protocol_handle_send_fragment (host, peer, command, & currentData))
|
|
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;
|
|
|
|
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:
|
|
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)
|
|
{
|
|
for (;;)
|
|
{
|
|
int receivedLength;
|
|
ENetBuffer buffer;
|
|
|
|
buffer.data = host -> receivedData;
|
|
buffer.dataLength = sizeof (host -> receivedData);
|
|
|
|
receivedLength = enet_socket_receive (host -> socket,
|
|
& host -> receivedAddress,
|
|
& buffer,
|
|
1);
|
|
|
|
if (receivedLength < 0)
|
|
return -1;
|
|
|
|
if (receivedLength == 0)
|
|
return 0;
|
|
|
|
host -> receivedDataLength = receivedLength;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
command -> header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
|
|
command -> header.channelID = acknowledgement -> command.header.channelID;
|
|
command -> acknowledge.receivedReliableSequenceNumber = ENET_HOST_TO_NET_16 (acknowledgement -> command.header.reliableSequenceNumber);
|
|
command -> acknowledge.receivedSentTime = ENET_HOST_TO_NET_16 (acknowledgement -> sentTime);
|
|
|
|
if ((acknowledgement -> command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
|
|
peer -> state = 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 -> packet -> dataLength))
|
|
{
|
|
host -> continueSending = 1;
|
|
|
|
break;
|
|
}
|
|
|
|
currentCommand = enet_list_next (currentCommand);
|
|
|
|
if (outgoingCommand -> packet != NULL)
|
|
{
|
|
peer -> packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
|
|
peer -> packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
|
|
|
|
if (peer -> packetThrottleCounter > peer -> packetThrottle)
|
|
{
|
|
-- outgoingCommand -> packet -> referenceCount;
|
|
|
|
if (outgoingCommand -> packet -> referenceCount == 0)
|
|
enet_packet_destroy (outgoingCommand -> packet);
|
|
|
|
enet_list_remove (& outgoingCommand -> outgoingCommandList);
|
|
enet_free (outgoingCommand);
|
|
|
|
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;
|
|
buffer -> dataLength = outgoingCommand -> packet -> dataLength;
|
|
|
|
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_peer_disconnect (peer, peer -> disconnectData);
|
|
}
|
|
|
|
static int
|
|
enet_protocol_check_timeouts (ENetHost * host, ENetPeer * peer, ENetEvent * event)
|
|
{
|
|
ENetOutgoingCommand * outgoingCommand;
|
|
ENetListIterator currentCommand;
|
|
|
|
currentCommand = enet_list_begin (& peer -> sentReliableCommands);
|
|
|
|
while (currentCommand != enet_list_end (& peer -> sentReliableCommands))
|
|
{
|
|
outgoingCommand = (ENetOutgoingCommand *) currentCommand;
|
|
|
|
currentCommand = enet_list_next (currentCommand);
|
|
|
|
if (ENET_TIME_DIFFERENCE (timeCurrent, 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(timeCurrent, peer -> earliestTimeout) >= ENET_PEER_TIMEOUT_MAXIMUM ||
|
|
(outgoingCommand -> roundTripTimeout >= outgoingCommand -> roundTripTimeoutLimit &&
|
|
ENET_TIME_DIFFERENCE(timeCurrent, peer -> earliestTimeout) >= ENET_PEER_TIMEOUT_MINIMUM)))
|
|
{
|
|
enet_protocol_notify_disconnect (host, peer, event);
|
|
|
|
return 1;
|
|
}
|
|
|
|
if (outgoingCommand -> packet != NULL)
|
|
peer -> reliableDataInTransit -= outgoingCommand -> fragmentLength;
|
|
|
|
++ peer -> packetsLost;
|
|
|
|
outgoingCommand -> roundTripTimeout *= 2;
|
|
|
|
enet_list_insert (enet_list_begin (& peer -> outgoingReliableCommands),
|
|
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 void
|
|
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;
|
|
|
|
currentCommand = enet_list_begin (& peer -> outgoingReliableCommands);
|
|
|
|
while (currentCommand != enet_list_end (& peer -> outgoingReliableCommands))
|
|
{
|
|
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)
|
|
{
|
|
host -> continueSending = 1;
|
|
|
|
break;
|
|
}
|
|
|
|
currentCommand = enet_list_next (currentCommand);
|
|
|
|
if (outgoingCommand -> packet != NULL)
|
|
{
|
|
if (peer -> reliableDataInTransit + outgoingCommand -> fragmentLength > peer -> windowSize)
|
|
break;
|
|
|
|
if ((enet_uint16) (peer -> mtu - host -> packetSize) < (enet_uint16) (commandSize + outgoingCommand -> fragmentLength))
|
|
{
|
|
host -> continueSending = 1;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (outgoingCommand -> roundTripTimeout == 0)
|
|
{
|
|
outgoingCommand -> roundTripTimeout = peer -> roundTripTime + 4 * peer -> roundTripTimeVariance;
|
|
outgoingCommand -> roundTripTimeoutLimit = ENET_PEER_TIMEOUT_LIMIT * outgoingCommand -> roundTripTimeout;
|
|
}
|
|
|
|
if (enet_list_empty (& peer -> sentReliableCommands))
|
|
peer -> nextTimeout = timeCurrent + outgoingCommand -> roundTripTimeout;
|
|
|
|
enet_list_insert (enet_list_end (& peer -> sentReliableCommands),
|
|
enet_list_remove (& outgoingCommand -> outgoingCommandList));
|
|
|
|
outgoingCommand -> sentTime = timeCurrent;
|
|
|
|
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;
|
|
|
|
++ command;
|
|
++ buffer;
|
|
}
|
|
|
|
host -> commandCount = command - host -> commands;
|
|
host -> bufferCount = buffer - host -> buffers;
|
|
}
|
|
|
|
static int
|
|
enet_protocol_send_outgoing_commands (ENetHost * host, ENetEvent * event, int checkForTimeouts)
|
|
{
|
|
ENetProtocolHeader header;
|
|
ENetPeer * currentPeer;
|
|
int sentLength;
|
|
|
|
host -> continueSending = 1;
|
|
|
|
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 (& currentPeer -> acknowledgements))
|
|
enet_protocol_send_acknowledgements (host, currentPeer);
|
|
|
|
if (checkForTimeouts != 0 &&
|
|
! enet_list_empty (& currentPeer -> sentReliableCommands) &&
|
|
ENET_TIME_GREATER_EQUAL (timeCurrent, currentPeer -> nextTimeout) &&
|
|
enet_protocol_check_timeouts (host, currentPeer, event) == 1)
|
|
return 1;
|
|
|
|
if (! enet_list_empty (& currentPeer -> outgoingReliableCommands))
|
|
enet_protocol_send_reliable_outgoing_commands (host, currentPeer);
|
|
else
|
|
if (enet_list_empty (& currentPeer -> sentReliableCommands) &&
|
|
ENET_TIME_DIFFERENCE (timeCurrent, currentPeer -> lastReceiveTime) >= ENET_PEER_PING_INTERVAL &&
|
|
currentPeer -> mtu - host -> packetSize >= sizeof (ENetProtocolPing))
|
|
{
|
|
enet_peer_ping (currentPeer);
|
|
enet_protocol_send_reliable_outgoing_commands (host, currentPeer);
|
|
}
|
|
|
|
if (! enet_list_empty (& currentPeer -> outgoingUnreliableCommands))
|
|
enet_protocol_send_unreliable_outgoing_commands (host, currentPeer);
|
|
|
|
if (host -> commandCount == 0)
|
|
continue;
|
|
|
|
if (currentPeer -> packetLossEpoch == 0)
|
|
currentPeer -> packetLossEpoch = timeCurrent;
|
|
else
|
|
if (ENET_TIME_DIFFERENCE (timeCurrent, 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
|
|
#ifdef WIN32
|
|
printf (
|
|
#else
|
|
fprintf (stderr,
|
|
#endif
|
|
"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 (& currentPeer -> outgoingReliableCommands), enet_list_size (& currentPeer -> outgoingUnreliableCommands), currentPeer -> channels != NULL ? enet_list_size (& currentPeer -> channels -> incomingReliableCommands) : 0, currentPeer -> channels != NULL ? enet_list_size (& currentPeer -> 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 = timeCurrent;
|
|
currentPeer -> packetsSent = 0;
|
|
currentPeer -> packetsLost = 0;
|
|
}
|
|
|
|
header.checksum = currentPeer -> sessionID;
|
|
header.peerID = ENET_HOST_TO_NET_16 (currentPeer -> outgoingPeerID | host -> headerFlags);
|
|
|
|
host -> buffers -> data = & header;
|
|
if (host -> headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME)
|
|
{
|
|
header.sentTime = ENET_HOST_TO_NET_16 (timeCurrent & 0xFFFF);
|
|
|
|
host -> buffers -> dataLength = sizeof (ENetProtocolHeader);
|
|
}
|
|
else
|
|
host -> buffers -> dataLength = (size_t) & ((ENetProtocolHeader *) 0) -> sentTime;
|
|
|
|
#ifdef USE_CRC32
|
|
header.checksum = enet_crc32 (host -> buffers, host -> bufferCount);
|
|
#endif
|
|
|
|
currentPeer -> lastSendTime = timeCurrent;
|
|
|
|
sentLength = enet_socket_send (host -> socket, & currentPeer -> address, host -> buffers, host -> bufferCount);
|
|
|
|
enet_protocol_remove_sent_unreliable_commands (currentPeer);
|
|
|
|
if (sentLength < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Sends any queued packets on the host specified to its designated peers.
|
|
|
|
@param host host to flush
|
|
@remarks this function need only be used in circumstances where one wishes to send queued packets earlier than in a call to enet_host_service().
|
|
@ingroup host
|
|
*/
|
|
void
|
|
enet_host_flush (ENetHost * host)
|
|
{
|
|
timeCurrent = enet_time_get ();
|
|
|
|
enet_protocol_send_outgoing_commands (host, NULL, 0);
|
|
}
|
|
|
|
/** Waits for events on the host specified and shuttles packets between
|
|
the host and its peers.
|
|
|
|
@param host host to service
|
|
@param event an event structure where event details will be placed if one occurs
|
|
if event == NULL then no events will be delivered
|
|
@param timeout number of milliseconds that ENet should wait for events
|
|
@retval > 0 if an event occurred within the specified time limit
|
|
@retval 0 if no event occurred
|
|
@retval < 0 on failure
|
|
@remarks enet_host_service should be called fairly regularly for adequate performance
|
|
@ingroup host
|
|
*/
|
|
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:
|
|
perror ("Error dispatching incoming packets");
|
|
|
|
return -1;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
timeCurrent = enet_time_get ();
|
|
|
|
timeout += timeCurrent;
|
|
|
|
do
|
|
{
|
|
if (ENET_TIME_DIFFERENCE (timeCurrent, 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:
|
|
perror ("Error sending outgoing packets");
|
|
|
|
return -1;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
switch (enet_protocol_receive_incoming_commands (host, event))
|
|
{
|
|
case 1:
|
|
return 1;
|
|
|
|
case -1:
|
|
perror ("Error receiving incoming packets");
|
|
|
|
return -1;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
switch (enet_protocol_send_outgoing_commands (host, event, 1))
|
|
{
|
|
case 1:
|
|
return 1;
|
|
|
|
case -1:
|
|
perror ("Error sending outgoing packets");
|
|
|
|
return -1;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (event != NULL)
|
|
{
|
|
switch (enet_protocol_dispatch_incoming_commands (host, event))
|
|
{
|
|
case 1:
|
|
return 1;
|
|
|
|
case -1:
|
|
perror ("Error dispatching incoming packets");
|
|
|
|
return -1;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
timeCurrent = enet_time_get ();
|
|
|
|
if (ENET_TIME_GREATER_EQUAL (timeCurrent, timeout))
|
|
return 0;
|
|
|
|
waitCondition = ENET_SOCKET_WAIT_RECEIVE;
|
|
|
|
if (enet_socket_wait (host -> socket, & waitCondition, ENET_TIME_DIFFERENCE (timeout, timeCurrent)) != 0)
|
|
return -1;
|
|
|
|
timeCurrent = enet_time_get ();
|
|
} while (waitCondition == ENET_SOCKET_WAIT_RECEIVE);
|
|
|
|
return 0;
|
|
}
|
|
|