/// <summary>
/// Send a message to all connections
/// </summary>
/// <param name="msg">The message to send</param>
/// <param name="method">How to deliver the message</param>
public void SendToAll(NetOutgoingMessage msg, NetDeliveryMethod method)
{
var all = this.Connections;
if (all.Count <= 0)
return;
SendMessage(msg, all, method, 0);
}
/// <summary>
/// Encrypt an outgoing message
/// </summary>
public bool Encrypt(NetOutgoingMessage msg)
{
int numBytes = msg.LengthBytes;
for (int i = 0; i < numBytes; i++)
{
int offset = i % m_key.Length;
msg.m_data[i] = (byte)(msg.m_data[i] ^ m_key[offset]);
}
return true;
}
internal override NetSendResult Enqueue(NetOutgoingMessage message)
{
int queueLen = m_queuedSends.Count + 1;
int left = m_windowSize - ((m_sendStart + NetConstants.NumSequenceNumbers) - m_windowStart) % NetConstants.NumSequenceNumbers;
if (queueLen > left)
return NetSendResult.Dropped;
m_queuedSends.Enqueue(message);
return NetSendResult.Sent;
}
// on user thread
private void SendFragmentedMessage(NetOutgoingMessage msg, IList<NetConnection> recipients, NetDeliveryMethod method, int sequenceChannel)
{
// Note: this group id is PER SENDING/NetPeer; ie. same id is sent to all recipients;
// this should be ok however; as long as recipients differentiate between same id but different sender
int group = Interlocked.Increment(ref m_lastUsedFragmentGroup);
if (group >= NetConstants.MaxFragmentationGroups)
{
// @TODO: not thread safe; but in practice probably not an issue
m_lastUsedFragmentGroup = 1;
group = 1;
}
msg.m_fragmentGroup = group;
// do not send msg; but set fragmentgroup in case user tries to recycle it immediately
// create fragmentation specifics
int totalBytes = msg.LengthBytes;
// determine minimum mtu for all recipients
int mtu = GetMTU(recipients);
int bytesPerChunk = NetFragmentationHelper.GetBestChunkSize(group, totalBytes, mtu);
int numChunks = totalBytes / bytesPerChunk;
if (numChunks * bytesPerChunk < totalBytes)
numChunks++;
int bitsPerChunk = bytesPerChunk * 8;
int bitsLeft = msg.LengthBits;
for (int i = 0; i < numChunks; i++)
{
NetOutgoingMessage chunk = CreateMessage(mtu);
chunk.m_bitLength = (bitsLeft > bitsPerChunk ? bitsPerChunk : bitsLeft);
chunk.m_data = msg.m_data;
chunk.m_fragmentGroup = group;
chunk.m_fragmentGroupTotalBits = totalBytes * 8;
chunk.m_fragmentChunkByteSize = bytesPerChunk;
chunk.m_fragmentChunkNumber = i;
NetException.Assert(chunk.m_bitLength != 0);
NetException.Assert(chunk.GetEncodedSize() < mtu);
Interlocked.Add(ref chunk.m_recyclingCount, recipients.Count);
foreach (NetConnection recipient in recipients)
recipient.EnqueueMessage(chunk, method, sequenceChannel);
bitsLeft -= bitsPerChunk;
}
return;
}
private void ExecuteSend(NetOutgoingMessage message)
{
m_connection.m_peer.VerifyNetworkThread();
int seqNr = m_sendStart;
m_sendStart = (m_sendStart + 1) % NetConstants.NumSequenceNumbers;
m_connection.QueueSendMessage(message, seqNr);
Interlocked.Decrement(ref message.m_recyclingCount);
if (message.m_recyclingCount <= 0)
m_connection.m_peer.Recycle(message);
return;
}
/// <summary>
/// Send a discovery response message
/// </summary>
public void SendDiscoveryResponse(NetOutgoingMessage msg, IPEndPoint recipient)
{
if (recipient == null)
throw new ArgumentNullException("recipient");
if (msg == null)
msg = CreateMessage(0);
else if (msg.m_isSent)
throw new NetException("Message has already been sent!");
if (msg.LengthBytes >= m_configuration.MaximumTransmissionUnit)
throw new NetException("Cannot send discovery message larger than MTU (currently " + m_configuration.MaximumTransmissionUnit + " bytes)");
msg.m_messageType = NetMessageType.DiscoveryResponse;
m_unsentUnconnectedMessages.Enqueue(new NetTuple<IPEndPoint, NetOutgoingMessage>(recipient, msg));
}
/// <summary>
/// Send a message to all connections except one
/// </summary>
/// <param name="msg">The message to send</param>
/// <param name="method">How to deliver the message</param>
/// <param name="except">Don't send to this particular connection</param>
/// <param name="sequenceChannel">Which sequence channel to use for the message</param>
public void SendToAll(NetOutgoingMessage msg, NetConnection except, NetDeliveryMethod method, int sequenceChannel)
{
var all = this.Connections;
if (all.Count <= 0)
return;
if (except == null)
{
SendMessage(msg, all, method, sequenceChannel);
return;
}
List<NetConnection> recipients = new List<NetConnection>(all.Count - 1);
foreach (var conn in all)
if (conn != except)
recipients.Add(conn);
if (recipients.Count > 0)
SendMessage(msg, recipients, method, sequenceChannel);
}
/// <summary>
/// Encrypt am outgoing message with this algorithm; no writing can be done to the message after encryption, or message will be corrupted
/// </summary>
public bool Encrypt(NetOutgoingMessage msg)
{
int payloadBitLength = msg.LengthBits;
int numBytes = msg.LengthBytes;
int blockSize = BlockSize;
int numBlocks = (int)Math.Ceiling((double)numBytes / (double)blockSize);
int dstSize = numBlocks * blockSize;
msg.EnsureBufferSize(dstSize * 8 + (4 * 8)); // add 4 bytes for payload length at end
msg.LengthBits = dstSize * 8; // length will automatically adjust +4 bytes when payload length is written
for (int i = 0; i < numBlocks; i++)
{
EncryptBlock(msg.m_data, (i * blockSize), m_tmp);
Buffer.BlockCopy(m_tmp, 0, msg.m_data, (i * blockSize), m_tmp.Length);
}
// add true payload length last
msg.Write((UInt32)payloadBitLength);
return true;
}
/// <summary>
/// Connect to a remote server
/// </summary>
/// <param name="remoteEndPoint">The remote endpoint to connect to</param>
/// <param name="hailMessage">The hail message to pass</param>
/// <returns>server connection, or null if already connected</returns>
public override NetConnection Connect(IPEndPoint remoteEndPoint, NetOutgoingMessage hailMessage)
{
lock (m_connections)
{
if (m_connections.Count > 0)
{
LogWarning("Connect attempt failed; Already connected");
return null;
}
}
lock (m_handshakes)
{
if (m_handshakes.Count > 0)
{
LogWarning("Connect attempt failed; Handshake already in progress");
return null;
}
}
return base.Connect(remoteEndPoint, hailMessage);
}
/// <summary>
/// Send a message to a specific connection
/// </summary>
/// <param name="msg">The message to send</param>
/// <param name="recipient">The recipient connection</param>
/// <param name="method">How to deliver the message</param>
/// <param name="sequenceChannel">Sequence channel within the delivery method</param>
public NetSendResult SendMessage(NetOutgoingMessage msg, NetConnection recipient, NetDeliveryMethod method, int sequenceChannel)
{
if (msg == null)
throw new ArgumentNullException("msg");
if (recipient == null)
throw new ArgumentNullException("recipient");
if (sequenceChannel >= NetConstants.NetChannelsPerDeliveryMethod)
throw new ArgumentOutOfRangeException("sequenceChannel");
NetException.Assert(
((method != NetDeliveryMethod.Unreliable && method != NetDeliveryMethod.ReliableUnordered) ||
((method == NetDeliveryMethod.Unreliable || method == NetDeliveryMethod.ReliableUnordered) && sequenceChannel == 0)),
"Delivery method " + method + " cannot use sequence channels other than 0!"
);
NetException.Assert(method != NetDeliveryMethod.Unknown, "Bad delivery method!");
if (msg.m_isSent)
throw new NetException("This message has already been sent! Use NetPeer.SendMessage() to send to multiple recipients efficiently");
msg.m_isSent = true;
int len = NetConstants.UnfragmentedMessageHeaderSize + msg.LengthBytes; // headers + length, faster than calling msg.GetEncodedSize
if (len <= recipient.m_currentMTU)
{
Interlocked.Increment(ref msg.m_recyclingCount);
return recipient.EnqueueMessage(msg, method, sequenceChannel);
}
else
{
// message must be fragmented!
if (recipient.m_status != NetConnectionStatus.Connected)
return NetSendResult.FailedNotConnected;
SendFragmentedMessage(msg, new NetConnection[] { recipient }, method, sequenceChannel);
return NetSendResult.Queued; // could be different for each connection; Queued is "most true"
}
}
/// <summary>
/// Send a message to a specific connection
/// </summary>
/// <param name="msg">The message to send</param>
/// <param name="recipient">The recipient connection</param>
/// <param name="method">How to deliver the message</param>
public NetSendResult SendMessage(NetOutgoingMessage msg, NetConnection recipient, NetDeliveryMethod method)
{
return SendMessage(msg, recipient, method, 0);
}
/// <summary>
/// Send a message to an unconnected host
/// </summary>
public void SendUnconnectedMessage(NetOutgoingMessage msg, string host, int port)
{
if (msg == null)
throw new ArgumentNullException("msg");
if (host == null)
throw new ArgumentNullException("host");
if (msg.m_isSent)
throw new NetException("This message has already been sent! Use NetPeer.SendMessage() to send to multiple recipients efficiently");
if (msg.LengthBytes > m_configuration.MaximumTransmissionUnit)
throw new NetException("Unconnected messages too long! Must be shorter than NetConfiguration.MaximumTransmissionUnit (currently " + m_configuration.MaximumTransmissionUnit + ")");
IPAddress adr = NetUtility.Resolve(host);
if (adr == null)
throw new NetException("Failed to resolve " + host);
msg.m_messageType = NetMessageType.Unconnected;
msg.m_isSent = true;
Interlocked.Increment(ref msg.m_recyclingCount);
m_unsentUnconnectedMessages.Enqueue(new NetTuple<IPEndPoint, NetOutgoingMessage>(new IPEndPoint(adr, port), msg));
}
private void ExecuteSend(float now, NetOutgoingMessage message)
{
int seqNr = m_sendStart;
m_sendStart = (m_sendStart + 1) % NetConstants.NumSequenceNumbers;
m_connection.QueueSendMessage(message, seqNr);
int storeIndex = seqNr % m_windowSize;
NetException.Assert(m_storedMessages[storeIndex].Message == null);
m_storedMessages[storeIndex].NumSent++;
m_storedMessages[storeIndex].Message = message;
m_storedMessages[storeIndex].LastSent = now;
m_storedMessages[storeIndex].SequenceNumber = seqNr;
return;
}
/// <summary>
/// Encrypt outgoing message
/// </summary>
public bool Encrypt(NetOutgoingMessage msg)
{
try
{
// nested usings are fun!
using (RC2CryptoServiceProvider rc2CryptoServiceProvider = new RC2CryptoServiceProvider { KeySize = m_bitSize, Mode = CipherMode.CBC })
{
using (ICryptoTransform cryptoTransform = rc2CryptoServiceProvider.CreateEncryptor(m_key, m_iv))
{
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform,
CryptoStreamMode.Write))
{
cryptoStream.Write(msg.m_data, 0, msg.m_data.Length);
}
msg.m_data = memoryStream.ToArray();
}
}
}
}
catch
{
return false;
}
return true;
}
// called by SendMessage() and NetPeer.SendMessage; ie. may be user thread
internal NetSendResult EnqueueMessage(NetOutgoingMessage msg, NetDeliveryMethod method, int sequenceChannel)
{
if (m_status != NetConnectionStatus.Connected)
return NetSendResult.FailedNotConnected;
NetMessageType tp = (NetMessageType)((int)method + sequenceChannel);
msg.m_messageType = tp;
// TODO: do we need to make this more thread safe?
int channelSlot = (int)method - 1 + sequenceChannel;
NetSenderChannelBase chan = m_sendChannels[channelSlot];
if (chan == null)
chan = CreateSenderChannel(tp);
if (msg.GetEncodedSize() > m_currentMTU)
throw new NetException("Message too large! Fragmentation failure?");
var retval = chan.Enqueue(msg);
if (retval == NetSendResult.Sent && m_peerConfiguration.m_autoFlushSendQueue == false)
retval = NetSendResult.Queued; // queued since we're not autoflushing
return retval;
}
/// <summary>
/// Create a connection to a remote endpoint
/// </summary>
public NetConnection Connect(string host, int port, NetOutgoingMessage hailMessage)
{
return Connect(new IPEndPoint(NetUtility.Resolve(host), port), hailMessage);
}
/// <summary>
/// Puts data in message
/// </summary>
/// <param name="message"></param>
protected override void Puts(NetOutgoingMessage message)
{
message.Write(this.M.Length);
message.Write(this.M);
}
// send message immediately
internal void SendLibrary(NetOutgoingMessage msg, IPEndPoint recipient)
{
VerifyNetworkThread();
NetException.Assert(msg.m_isSent == false);
bool connReset;
int len = msg.Encode(m_sendBuffer, 0, 0);
SendPacket(len, recipient, 1, out connReset);
}
internal void Recycle(NetOutgoingMessage msg)
{
if (m_outgoingMessagesPool == null)
return;
#if DEBUG
if (m_outgoingMessagesPool.Contains(msg))
throw new NetException("Recyling already recycled message! Thread race?");
#endif
byte[] storage = msg.m_data;
msg.m_data = null;
// message fragments cannot be recycled
// TODO: find a way to recycle large message after all fragments has been acknowledged; or? possibly better just to garbage collect them
if (msg.m_fragmentGroup == 0)
Recycle(storage);
msg.Reset();
m_outgoingMessagesPool.Enqueue(msg);
}
public void Reset()
{
NumSent = 0;
LastSent = 0;
Message = null;
}
/// <summary>
/// Sends message to server
/// </summary>
public NetSendResult SendMessage(NetOutgoingMessage msg, NetDeliveryMethod method, int sequenceChannel)
{
NetConnection serverConnection = ServerConnection;
if (serverConnection == null)
{
LogWarning("Cannot send message, no server connection!");
return NetSendResult.FailedNotConnected;
}
return serverConnection.SendMessage(msg, method, sequenceChannel);
}
/// <summary>
/// Puts data into message
/// </summary>
/// <param name="message">desination</param>
protected override void Puts(NetOutgoingMessage message)
{
message.Write(this.Username);
message.Write(this.OtherData.Length);
if (this.OtherData.Length > 0)
message.Write(this.OtherData);
Byte[] bytes = this.A.ToByteArray();
message.Write(bytes.Length);
message.Write(bytes);
}
/// <summary>
/// Send a message to an unconnected host
/// </summary>
public void SendUnconnectedMessage(NetOutgoingMessage msg, IList<IPEndPoint> recipients)
{
if (msg == null)
throw new ArgumentNullException("msg");
if (recipients == null)
throw new ArgumentNullException("recipients");
if (recipients.Count < 1)
throw new NetException("recipients must contain at least one item");
if (msg.m_isSent)
throw new NetException("This message has already been sent! Use NetPeer.SendMessage() to send to multiple recipients efficiently");
if (msg.LengthBytes > m_configuration.MaximumTransmissionUnit)
throw new NetException("Unconnected messages too long! Must be shorter than NetConfiguration.MaximumTransmissionUnit (currently " + m_configuration.MaximumTransmissionUnit + ")");
msg.m_messageType = NetMessageType.Unconnected;
msg.m_isSent = true;
Interlocked.Add(ref msg.m_recyclingCount, recipients.Count);
foreach (IPEndPoint ep in recipients)
m_unsentUnconnectedMessages.Enqueue(new NetTuple<IPEndPoint, NetOutgoingMessage>(ep, msg));
}
internal abstract NetSendResult Send(float now, NetOutgoingMessage message);
/// <summary>
/// Send a message to this exact same netpeer (loopback)
/// </summary>
public void SendUnconnectedToSelf(NetOutgoingMessage msg)
{
if (msg == null)
throw new ArgumentNullException("msg");
if (msg.m_isSent)
throw new NetException("This message has already been sent! Use NetPeer.SendMessage() to send to multiple recipients efficiently");
msg.m_messageType = NetMessageType.Unconnected;
msg.m_isSent = true;
if (m_configuration.IsMessageTypeEnabled(NetIncomingMessageType.UnconnectedData) == false)
return; // dropping unconnected message since it's not enabled for receiving
NetIncomingMessage om = CreateIncomingMessage(NetIncomingMessageType.UnconnectedData, msg.LengthBytes);
om.Write(msg);
om.m_isFragment = false;
om.m_receiveTime = NetTime.Now;
om.m_senderConnection = null;
om.m_senderEndPoint = m_socket.LocalEndPoint as IPEndPoint;
NetException.Assert(om.m_bitLength == msg.LengthBits);
ReleaseMessage(om);
}
/// <summary>
/// Create a connection to a remote endpoint
/// </summary>
public virtual NetConnection Connect(IPEndPoint remoteEndPoint, NetOutgoingMessage hailMessage)
{
if (remoteEndPoint == null)
throw new ArgumentNullException("remoteEndPoint");
lock (m_connections)
{
if (m_status == NetPeerStatus.NotRunning)
throw new NetException("Must call Start() first");
if (m_connectionLookup.ContainsKey(remoteEndPoint))
throw new NetException("Already connected to that endpoint!");
NetConnection hs;
if (m_handshakes.TryGetValue(remoteEndPoint, out hs))
{
// already trying to connect to that endpoint; make another try
switch (hs.m_status)
{
case NetConnectionStatus.InitiatedConnect:
// send another connect
hs.m_connectRequested = true;
break;
case NetConnectionStatus.RespondedConnect:
// send another response
hs.SendConnectResponse((float)NetTime.Now, false);
break;
default:
// weird
LogWarning("Weird situation; Connect() already in progress to remote endpoint; but hs status is " + hs.m_status);
break;
}
return hs;
}
NetConnection conn = new NetConnection(this, remoteEndPoint);
conn.m_status = NetConnectionStatus.InitiatedConnect;
conn.m_localHailMessage = hailMessage;
// handle on network thread
conn.m_connectRequested = true;
conn.m_connectionInitiator = true;
m_handshakes.Add(remoteEndPoint, conn);
return conn;
}
}
/// <summary>
/// Send a message to a list of connections
/// </summary>
/// <param name="msg">The message to send</param>
/// <param name="recipients">The list of recipients to send to</param>
/// <param name="method">How to deliver the message</param>
/// <param name="sequenceChannel">Sequence channel within the delivery method</param>
public void SendMessage(NetOutgoingMessage msg, List<NetConnection> recipients, NetDeliveryMethod method, int sequenceChannel)
{
if (msg == null)
throw new ArgumentNullException("msg");
if (recipients == null)
throw new ArgumentNullException("recipients");
if (recipients.Count < 1)
throw new NetException("recipients must contain at least one item");
if (method == NetDeliveryMethod.Unreliable || method == NetDeliveryMethod.ReliableUnordered)
NetException.Assert(sequenceChannel == 0, "Delivery method " + method + " cannot use sequence channels other than 0!");
if (msg.m_isSent)
throw new NetException("This message has already been sent! Use NetPeer.SendMessage() to send to multiple recipients efficiently");
int mtu = GetMTU(recipients);
msg.m_isSent = true;
int len = msg.GetEncodedSize();
if (len <= mtu)
{
Interlocked.Add(ref msg.m_recyclingCount, recipients.Count);
foreach (NetConnection conn in recipients)
{
if (conn == null)
{
Interlocked.Decrement(ref msg.m_recyclingCount);
continue;
}
NetSendResult res = conn.EnqueueMessage(msg, method, sequenceChannel);
if (res != NetSendResult.Queued && res != NetSendResult.Sent)
Interlocked.Decrement(ref msg.m_recyclingCount);
}
}
else
{
// message must be fragmented!
SendFragmentedMessage(msg, recipients, method, sequenceChannel);
}
return;
}
// Queue an item for immediate sending on the wire
// This method is called from the ISenderChannels
internal void QueueSendMessage(NetOutgoingMessage om, int seqNr)
{
m_peer.VerifyNetworkThread();
int sz = om.GetEncodedSize();
if (sz > m_currentMTU)
m_peer.LogWarning("Message larger than MTU! Fragmentation must have failed!");
if (m_sendBufferWritePtr + sz > m_currentMTU)
{
bool connReset; // TODO: handle connection reset
NetException.Assert(m_sendBufferWritePtr > 0 && m_sendBufferNumMessages > 0); // or else the message should have been fragmented earlier
m_peer.SendPacket(m_sendBufferWritePtr, m_remoteEndPoint, m_sendBufferNumMessages, out connReset);
m_statistics.PacketSent(m_sendBufferWritePtr, m_sendBufferNumMessages);
m_sendBufferWritePtr = 0;
m_sendBufferNumMessages = 0;
}
m_sendBufferWritePtr = om.Encode(m_peer.m_sendBuffer, m_sendBufferWritePtr, seqNr);
m_sendBufferNumMessages++;
NetException.Assert(m_sendBufferWritePtr > 0, "Encoded zero size message?");
NetException.Assert(m_sendBufferNumMessages > 0);
}
/// <summary>
/// Creates a new message for sending
/// </summary>
/// <param name="initialCapacity">initial capacity in bytes</param>
public NetOutgoingMessage CreateMessage(int initialCapacity)
{
NetOutgoingMessage retval;
if (m_outgoingMessagesPool == null || !m_outgoingMessagesPool.TryDequeue(out retval))
retval = new NetOutgoingMessage();
byte[] storage = GetStorage(initialCapacity);
retval.m_data = storage;
return retval;
}
/// <summary>
/// Send a message to this remote connection
/// </summary>
/// <param name="msg">The message to send</param>
/// <param name="method">How to deliver the message</param>
/// <param name="sequenceChannel">Sequence channel within the delivery method</param>
public NetSendResult SendMessage(NetOutgoingMessage msg, NetDeliveryMethod method, int sequenceChannel)
{
return m_peer.SendMessage(msg, this, method, sequenceChannel);
}
