480 lines
17 KiB
C
480 lines
17 KiB
C
/**
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@file host.c
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@brief ENet host management functions
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*/
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#define ENET_BUILDING_LIB 1
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#include <string.h>
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#include <time.h>
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#include "enet/enet.h"
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/** @defgroup host ENet host functions
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@{
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*/
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/** Creates a host for communicating to peers.
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@param address the address at which other peers may connect to this host. If NULL, then no peers may connect to the host.
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@param peerCount the maximum number of peers that should be allocated for the host.
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@param channelLimit the maximum number of channels allowed; if 0, then this is equivalent to ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT
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@param incomingBandwidth downstream bandwidth of the host in bytes/second; if 0, ENet will assume unlimited bandwidth.
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@param outgoingBandwidth upstream bandwidth of the host in bytes/second; if 0, ENet will assume unlimited bandwidth.
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@returns the host on success and NULL on failure
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@remarks ENet will strategically drop packets on specific sides of a connection between hosts
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to ensure the host's bandwidth is not overwhelmed. The bandwidth parameters also determine
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the window size of a connection which limits the amount of reliable packets that may be in transit
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at any given time.
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*/
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ENetHost *
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enet_host_create (const ENetAddress * address, size_t peerCount, size_t channelLimit, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth)
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{
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ENetHost * host;
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ENetPeer * currentPeer;
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if (peerCount > ENET_PROTOCOL_MAXIMUM_PEER_ID)
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return NULL;
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host = (ENetHost *) enet_malloc (sizeof (ENetHost));
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if (host == NULL)
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return NULL;
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host -> peers = (ENetPeer *) enet_malloc (peerCount * sizeof (ENetPeer));
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if (host -> peers == NULL)
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{
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enet_free (host);
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return NULL;
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}
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memset (host -> peers, 0, peerCount * sizeof (ENetPeer));
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host -> socket = enet_socket_create (ENET_SOCKET_TYPE_DATAGRAM);
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if (host -> socket == ENET_SOCKET_NULL || (address != NULL && enet_socket_bind (host -> socket, address) < 0))
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{
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if (host -> socket != ENET_SOCKET_NULL)
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enet_socket_destroy (host -> socket);
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enet_free (host -> peers);
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enet_free (host);
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return NULL;
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}
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enet_socket_set_option (host -> socket, ENET_SOCKOPT_NONBLOCK, 1);
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enet_socket_set_option (host -> socket, ENET_SOCKOPT_BROADCAST, 1);
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enet_socket_set_option (host -> socket, ENET_SOCKOPT_RCVBUF, ENET_HOST_RECEIVE_BUFFER_SIZE);
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enet_socket_set_option (host -> socket, ENET_SOCKOPT_SNDBUF, ENET_HOST_SEND_BUFFER_SIZE);
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if (address != NULL)
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host -> address = * address;
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if (! channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
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channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
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else
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if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
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channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
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host -> randomSeed = (enet_uint32) time(NULL) + (enet_uint32) (size_t) host;
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host -> randomSeed = (host -> randomSeed << 16) | (host -> randomSeed >> 16);
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host -> channelLimit = channelLimit;
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host -> incomingBandwidth = incomingBandwidth;
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host -> outgoingBandwidth = outgoingBandwidth;
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host -> bandwidthThrottleEpoch = 0;
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host -> recalculateBandwidthLimits = 0;
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host -> mtu = ENET_HOST_DEFAULT_MTU;
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host -> peerCount = peerCount;
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host -> commandCount = 0;
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host -> bufferCount = 0;
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host -> checksum = NULL;
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host -> receivedAddress.host = ENET_HOST_ANY;
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host -> receivedAddress.port = 0;
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host -> receivedData = NULL;
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host -> receivedDataLength = 0;
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host -> totalSentData = 0;
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host -> totalSentPackets = 0;
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host -> totalReceivedData = 0;
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host -> totalReceivedPackets = 0;
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host -> compressor.context = NULL;
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host -> compressor.compress = NULL;
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host -> compressor.decompress = NULL;
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host -> compressor.destroy = NULL;
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enet_list_clear (& host -> dispatchQueue);
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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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currentPeer -> host = host;
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currentPeer -> incomingPeerID = currentPeer - host -> peers;
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currentPeer -> outgoingSessionID = currentPeer -> incomingSessionID = 0xFF;
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currentPeer -> data = NULL;
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enet_list_clear (& currentPeer -> acknowledgements);
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enet_list_clear (& currentPeer -> sentReliableCommands);
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enet_list_clear (& currentPeer -> sentUnreliableCommands);
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enet_list_clear (& currentPeer -> outgoingReliableCommands);
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enet_list_clear (& currentPeer -> outgoingUnreliableCommands);
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enet_list_clear (& currentPeer -> dispatchedCommands);
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enet_peer_reset (currentPeer);
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}
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return host;
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}
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/** Destroys the host and all resources associated with it.
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@param host pointer to the host to destroy
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*/
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void
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enet_host_destroy (ENetHost * host)
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{
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ENetPeer * currentPeer;
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enet_socket_destroy (host -> socket);
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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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enet_peer_reset (currentPeer);
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}
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if (host -> compressor.context != NULL && host -> compressor.destroy)
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(* host -> compressor.destroy) (host -> compressor.context);
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enet_free (host -> peers);
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enet_free (host);
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}
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/** Initiates a connection to a foreign host.
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@param host host seeking the connection
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@param address destination for the connection
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@param channelCount number of channels to allocate
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@param data user data supplied to the receiving host
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@returns a peer representing the foreign host on success, NULL on failure
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@remarks The peer returned will have not completed the connection until enet_host_service()
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notifies of an ENET_EVENT_TYPE_CONNECT event for the peer.
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*/
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ENetPeer *
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enet_host_connect (ENetHost * host, const ENetAddress * address, size_t channelCount, enet_uint32 data)
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{
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ENetPeer * currentPeer;
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ENetChannel * channel;
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ENetProtocol command;
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if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
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channelCount = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
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else
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if (channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
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channelCount = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
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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 -> channels = (ENetChannel *) enet_malloc (channelCount * sizeof (ENetChannel));
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if (currentPeer -> channels == NULL)
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return NULL;
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currentPeer -> channelCount = channelCount;
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currentPeer -> state = ENET_PEER_STATE_CONNECTING;
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currentPeer -> address = * address;
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currentPeer -> connectID = ++ host -> randomSeed;
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if (host -> outgoingBandwidth == 0)
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currentPeer -> windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
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else
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currentPeer -> windowSize = (host -> outgoingBandwidth /
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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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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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enet_list_clear (& channel -> incomingReliableCommands);
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enet_list_clear (& channel -> incomingUnreliableCommands);
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channel -> usedReliableWindows = 0;
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memset (channel -> reliableWindows, 0, sizeof (channel -> reliableWindows));
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}
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command.header.command = ENET_PROTOCOL_COMMAND_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
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command.header.channelID = 0xFF;
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command.connect.outgoingPeerID = ENET_HOST_TO_NET_16 (currentPeer -> incomingPeerID);
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command.connect.incomingSessionID = currentPeer -> incomingSessionID;
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command.connect.outgoingSessionID = currentPeer -> outgoingSessionID;
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command.connect.mtu = ENET_HOST_TO_NET_32 (currentPeer -> mtu);
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command.connect.windowSize = ENET_HOST_TO_NET_32 (currentPeer -> windowSize);
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command.connect.channelCount = ENET_HOST_TO_NET_32 (channelCount);
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command.connect.incomingBandwidth = ENET_HOST_TO_NET_32 (host -> incomingBandwidth);
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command.connect.outgoingBandwidth = ENET_HOST_TO_NET_32 (host -> outgoingBandwidth);
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command.connect.packetThrottleInterval = ENET_HOST_TO_NET_32 (currentPeer -> packetThrottleInterval);
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command.connect.packetThrottleAcceleration = ENET_HOST_TO_NET_32 (currentPeer -> packetThrottleAcceleration);
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command.connect.packetThrottleDeceleration = ENET_HOST_TO_NET_32 (currentPeer -> packetThrottleDeceleration);
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command.connect.connectID = currentPeer -> connectID;
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command.connect.data = ENET_HOST_TO_NET_32 (data);
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enet_peer_queue_outgoing_command (currentPeer, & command, NULL, 0, 0);
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return currentPeer;
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}
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/** Queues a packet to be sent to all peers associated with the host.
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@param host host on which to broadcast the packet
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@param channelID channel on which to broadcast
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@param packet packet to broadcast
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*/
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void
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enet_host_broadcast (ENetHost * host, enet_uint8 channelID, ENetPacket * packet)
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{
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ENetPeer * currentPeer;
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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_CONNECTED)
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continue;
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enet_peer_send (currentPeer, channelID, packet);
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}
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if (packet -> referenceCount == 0)
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enet_packet_destroy (packet);
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}
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/** Sets the packet compressor the host should use to compress and decompress packets.
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@param host host to enable or disable compression for
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@param compressor callbacks for for the packet compressor; if NULL, then compression is disabled
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*/
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void
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enet_host_compress (ENetHost * host, const ENetCompressor * compressor)
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{
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if (host -> compressor.context != NULL && host -> compressor.destroy)
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(* host -> compressor.destroy) (host -> compressor.context);
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if (compressor)
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host -> compressor = * compressor;
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else
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host -> compressor.context = NULL;
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}
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/** Limits the maximum allowed channels of future incoming connections.
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@param host host to limit
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@param channelLimit the maximum number of channels allowed; if 0, then this is equivalent to ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT
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*/
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void
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enet_host_channel_limit (ENetHost * host, size_t channelLimit)
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{
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if (! channelLimit || channelLimit > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
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channelLimit = ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT;
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else
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if (channelLimit < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT)
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channelLimit = ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT;
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host -> channelLimit = channelLimit;
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}
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/** Adjusts the bandwidth limits of a host.
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@param host host to adjust
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@param incomingBandwidth new incoming bandwidth
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@param outgoingBandwidth new outgoing bandwidth
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@remarks the incoming and outgoing bandwidth parameters are identical in function to those
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specified in enet_host_create().
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*/
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void
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enet_host_bandwidth_limit (ENetHost * host, enet_uint32 incomingBandwidth, enet_uint32 outgoingBandwidth)
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{
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host -> incomingBandwidth = incomingBandwidth;
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host -> outgoingBandwidth = outgoingBandwidth;
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host -> recalculateBandwidthLimits = 1;
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}
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void
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enet_host_bandwidth_throttle (ENetHost * host)
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{
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enet_uint32 timeCurrent = enet_time_get (),
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elapsedTime = timeCurrent - host -> bandwidthThrottleEpoch,
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peersTotal = 0,
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dataTotal = 0,
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peersRemaining,
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bandwidth,
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throttle = 0,
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bandwidthLimit = 0;
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int needsAdjustment;
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ENetPeer * peer;
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ENetProtocol command;
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if (elapsedTime < ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
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return;
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for (peer = host -> peers;
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peer < & host -> peers [host -> peerCount];
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++ peer)
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{
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if (peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER)
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continue;
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++ peersTotal;
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dataTotal += peer -> outgoingDataTotal;
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}
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if (peersTotal == 0)
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return;
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peersRemaining = peersTotal;
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needsAdjustment = 1;
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if (host -> outgoingBandwidth == 0)
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bandwidth = ~0;
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else
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bandwidth = (host -> outgoingBandwidth * elapsedTime) / 1000;
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while (peersRemaining > 0 && needsAdjustment != 0)
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{
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needsAdjustment = 0;
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if (dataTotal < bandwidth)
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throttle = ENET_PEER_PACKET_THROTTLE_SCALE;
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else
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throttle = (bandwidth * ENET_PEER_PACKET_THROTTLE_SCALE) / dataTotal;
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for (peer = host -> peers;
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peer < & host -> peers [host -> peerCount];
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++ peer)
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{
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enet_uint32 peerBandwidth;
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if ((peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER) ||
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peer -> incomingBandwidth == 0 ||
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peer -> outgoingBandwidthThrottleEpoch == timeCurrent)
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continue;
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peerBandwidth = (peer -> incomingBandwidth * elapsedTime) / 1000;
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if ((throttle * peer -> outgoingDataTotal) / ENET_PEER_PACKET_THROTTLE_SCALE <= peerBandwidth)
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continue;
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peer -> packetThrottleLimit = (peerBandwidth *
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ENET_PEER_PACKET_THROTTLE_SCALE) / peer -> outgoingDataTotal;
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if (peer -> packetThrottleLimit == 0)
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peer -> packetThrottleLimit = 1;
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if (peer -> packetThrottle > peer -> packetThrottleLimit)
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peer -> packetThrottle = peer -> packetThrottleLimit;
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peer -> outgoingBandwidthThrottleEpoch = timeCurrent;
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needsAdjustment = 1;
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-- peersRemaining;
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bandwidth -= peerBandwidth;
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dataTotal -= peerBandwidth;
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}
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}
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if (peersRemaining > 0)
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for (peer = host -> peers;
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peer < & host -> peers [host -> peerCount];
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++ peer)
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{
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if ((peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER) ||
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peer -> outgoingBandwidthThrottleEpoch == timeCurrent)
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continue;
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peer -> packetThrottleLimit = throttle;
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if (peer -> packetThrottle > peer -> packetThrottleLimit)
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peer -> packetThrottle = peer -> packetThrottleLimit;
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}
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if (host -> recalculateBandwidthLimits)
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{
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host -> recalculateBandwidthLimits = 0;
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peersRemaining = peersTotal;
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bandwidth = host -> incomingBandwidth;
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needsAdjustment = 1;
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if (bandwidth == 0)
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bandwidthLimit = 0;
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else
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while (peersRemaining > 0 && needsAdjustment != 0)
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{
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needsAdjustment = 0;
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bandwidthLimit = bandwidth / peersRemaining;
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for (peer = host -> peers;
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peer < & host -> peers [host -> peerCount];
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++ peer)
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{
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if ((peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER) ||
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peer -> incomingBandwidthThrottleEpoch == timeCurrent)
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continue;
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if (peer -> outgoingBandwidth > 0 &&
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peer -> outgoingBandwidth >= bandwidthLimit)
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continue;
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peer -> incomingBandwidthThrottleEpoch = timeCurrent;
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needsAdjustment = 1;
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-- peersRemaining;
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bandwidth -= peer -> outgoingBandwidth;
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}
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}
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for (peer = host -> peers;
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peer < & host -> peers [host -> peerCount];
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++ peer)
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{
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if (peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER)
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continue;
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command.header.command = ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
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command.header.channelID = 0xFF;
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command.bandwidthLimit.outgoingBandwidth = ENET_HOST_TO_NET_32 (host -> outgoingBandwidth);
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if (peer -> incomingBandwidthThrottleEpoch == timeCurrent)
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command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32 (peer -> outgoingBandwidth);
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else
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command.bandwidthLimit.incomingBandwidth = ENET_HOST_TO_NET_32 (bandwidthLimit);
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enet_peer_queue_outgoing_command (peer, & command, NULL, 0, 0);
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}
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}
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host -> bandwidthThrottleEpoch = timeCurrent;
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for (peer = host -> peers;
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peer < & host -> peers [host -> peerCount];
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++ peer)
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{
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peer -> incomingDataTotal = 0;
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peer -> outgoingDataTotal = 0;
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}
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}
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/** @} */
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