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