private void HandleRetransmittedHandshakeRecord(int epoch, byte[] buf, int off, int len)
{
/*
* TODO Need to handle the case where the previous inbound flight contains
* messages from two epochs.
*/
if (len < 12)
{
return;
}
int fragment_length = TlsUtilities.ReadUint24(buf, off + 9);
if (len != (fragment_length + 12))
{
return;
}
int seq = TlsUtilities.ReadUint16(buf, off + 4);
if (seq >= mNextReceiveSeq)
{
return;
}
byte msg_type = TlsUtilities.ReadUint8(buf, off);
// TODO This is a hack that only works until we try to support renegotiation
int expectedEpoch = msg_type == HandshakeType.finished ? 1 : 0;
if (epoch != expectedEpoch)
{
return;
}
int length = TlsUtilities.ReadUint24(buf, off + 1);
int fragment_offset = TlsUtilities.ReadUint24(buf, off + 6);
if (fragment_offset + fragment_length > length)
{
return;
}
DtlsReassembler reassembler = (DtlsReassembler)mCurrentInboundFlight[seq];
if (reassembler != null)
{
reassembler.ContributeFragment(msg_type, length, buf, off + 12, fragment_offset,
fragment_length);
if (CheckAll(mCurrentInboundFlight))
{
ResendOutboundFlight();
ResetAll(mCurrentInboundFlight);
}
}
}
private Message GetPendingMessage()
{
DtlsReassembler next = (DtlsReassembler)mCurrentInboundFlight[mNextReceiveSeq];
if (next != null)
{
byte[] body = next.GetBodyIfComplete();
if (body != null)
{
mPreviousInboundFlight = null;
return(UpdateHandshakeMessagesDigest(new Message(mNextReceiveSeq++, next.MsgType, body)));
}
}
return(null);
}
private void HandleRetransmittedHandshakeRecord(int epoch, byte[] buf, int off, int len)
{
if (len < 12)
{
return;
}
int num = TlsUtilities.ReadUint24(buf, off + 9);
if (len != num + 12)
{
return;
}
int num2 = TlsUtilities.ReadUint16(buf, off + 4);
if (num2 >= this.mNextReceiveSeq)
{
return;
}
byte b = TlsUtilities.ReadUint8(buf, off);
int num3 = (b == 20) ? 1 : 0;
if (epoch != num3)
{
return;
}
int num4 = TlsUtilities.ReadUint24(buf, off + 1);
int num5 = TlsUtilities.ReadUint24(buf, off + 6);
if (num5 + num > num4)
{
return;
}
DtlsReassembler dtlsReassembler = (DtlsReassembler)this.mCurrentInboundFlight[num2];
if (dtlsReassembler != null)
{
dtlsReassembler.ContributeFragment(b, num4, buf, off + 12, num5, num);
if (DtlsReliableHandshake.CheckAll(this.mCurrentInboundFlight))
{
this.ResendOutboundFlight();
DtlsReliableHandshake.ResetAll(this.mCurrentInboundFlight);
}
}
}
private static void ResetAll(IDictionary inboundFlight)
{
global::System.Collections.IEnumerator enumerator = ((global::System.Collections.IEnumerable)inboundFlight.get_Values()).GetEnumerator();
try
{
while (enumerator.MoveNext())
{
DtlsReassembler dtlsReassembler = (DtlsReassembler)enumerator.get_Current();
dtlsReassembler.Reset();
}
}
finally
{
global::System.IDisposable disposable = enumerator as global::System.IDisposable;
if (disposable != null)
{
disposable.Dispose();
}
}
}
private static bool CheckAll(IDictionary inboundFlight)
{
global::System.Collections.IEnumerator enumerator = ((global::System.Collections.IEnumerable)inboundFlight.get_Values()).GetEnumerator();
try
{
while (enumerator.MoveNext())
{
DtlsReassembler dtlsReassembler = (DtlsReassembler)enumerator.get_Current();
if (dtlsReassembler.GetBodyIfComplete() == null)
{
return(false);
}
}
}
finally
{
global::System.IDisposable disposable = enumerator as global::System.IDisposable;
if (disposable != null)
{
disposable.Dispose();
}
}
return(true);
}
internal Message ReceiveMessage()
{
if (mSending)
{
mSending = false;
PrepareInboundFlight();
}
// Check if we already have the next message waiting
{
DtlsReassembler next = (DtlsReassembler)mCurrentInboundFlight[mNextReceiveSeq];
if (next != null)
{
byte[] body = next.GetBodyIfComplete();
if (body != null)
{
mPreviousInboundFlight = null;
return UpdateHandshakeMessagesDigest(new Message(mNextReceiveSeq++, next.MsgType, body));
}
}
}
byte[] buf = null;
// TODO Check the conditions under which we should reset this
int readTimeoutMillis = 1000;
for (;;)
{
int receiveLimit = mRecordLayer.GetReceiveLimit();
if (buf == null || buf.Length < receiveLimit)
{
buf = new byte[receiveLimit];
}
// TODO Handle records containing multiple handshake messages
try
{
for (; ; )
{
int Received = mRecordLayer.Receive(buf, 0, receiveLimit, readTimeoutMillis);
if (Received < 0)
{
break;
}
if (Received < 12)
{
continue;
}
int fragment_length = TlsUtilities.ReadUint24(buf, 9);
if (Received != (fragment_length + 12))
{
continue;
}
int seq = TlsUtilities.ReadUint16(buf, 4);
if (seq > (mNextReceiveSeq + MAX_RECEIVE_AHEAD))
{
continue;
}
byte msg_type = TlsUtilities.ReadUint8(buf, 0);
int length = TlsUtilities.ReadUint24(buf, 1);
int fragment_offset = TlsUtilities.ReadUint24(buf, 6);
if (fragment_offset + fragment_length > length)
{
continue;
}
if (seq < mNextReceiveSeq)
{
/*
* NOTE: If we Receive the previous flight of incoming messages in full
* again, retransmit our last flight
*/
if (mPreviousInboundFlight != null)
{
DtlsReassembler reassembler = (DtlsReassembler)mPreviousInboundFlight[seq];
if (reassembler != null)
{
reassembler.ContributeFragment(msg_type, length, buf, 12, fragment_offset,
fragment_length);
if (CheckAll(mPreviousInboundFlight))
{
ResendOutboundFlight();
/*
* TODO[DTLS] implementations SHOULD back off handshake packet
* size during the retransmit backoff.
*/
readTimeoutMillis = System.Math.Min(readTimeoutMillis * 2, 60000);
ResetAll(mPreviousInboundFlight);
}
}
}
}
else
{
DtlsReassembler reassembler = (DtlsReassembler)mCurrentInboundFlight[seq];
if (reassembler == null)
{
reassembler = new DtlsReassembler(msg_type, length);
mCurrentInboundFlight[seq] = reassembler;
}
reassembler.ContributeFragment(msg_type, length, buf, 12, fragment_offset, fragment_length);
if (seq == mNextReceiveSeq)
{
byte[] body = reassembler.GetBodyIfComplete();
if (body != null)
{
mPreviousInboundFlight = null;
return UpdateHandshakeMessagesDigest(new Message(mNextReceiveSeq++,
reassembler.MsgType, body));
}
}
}
}
}
catch (IOException)
{
// NOTE: Assume this is a timeout for the moment
}
ResendOutboundFlight();
/*
* TODO[DTLS] implementations SHOULD back off handshake packet size during the
* retransmit backoff.
*/
readTimeoutMillis = System.Math.Min(readTimeoutMillis * 2, 60000);
}
}
private bool ProcessRecord(int windowSize, int epoch, byte[] buf, int off, int len)
{
bool checkPreviousFlight = false;
while (len >= MessageHeaderLength)
{
int fragment_length = TlsUtilities.ReadUint24(buf, off + 9);
int message_length = fragment_length + MessageHeaderLength;
if (len < message_length)
{
// NOTE: Truncated message - ignore it
break;
}
int length = TlsUtilities.ReadUint24(buf, off + 1);
int fragment_offset = TlsUtilities.ReadUint24(buf, off + 6);
if (fragment_offset + fragment_length > length)
{
// NOTE: Malformed fragment - ignore it and the rest of the record
break;
}
/*
* NOTE: This very simple epoch check will only work until we want to support
* renegotiation (and we're not likely to do that anyway).
*/
byte msg_type = TlsUtilities.ReadUint8(buf, off + 0);
int expectedEpoch = msg_type == HandshakeType.finished ? 1 : 0;
if (epoch != expectedEpoch)
{
break;
}
int message_seq = TlsUtilities.ReadUint16(buf, off + 4);
if (message_seq >= (mNextReceiveSeq + windowSize))
{
// NOTE: Too far ahead - ignore
}
else if (message_seq >= mNextReceiveSeq)
{
DtlsReassembler reassembler = (DtlsReassembler)mCurrentInboundFlight[message_seq];
if (reassembler == null)
{
reassembler = new DtlsReassembler(msg_type, length);
mCurrentInboundFlight[message_seq] = reassembler;
}
reassembler.ContributeFragment(msg_type, length, buf, off + MessageHeaderLength, fragment_offset,
fragment_length);
}
else if (mPreviousInboundFlight != null)
{
/*
* NOTE: If we receive the previous flight of incoming messages in full again,
* retransmit our last flight
*/
DtlsReassembler reassembler = (DtlsReassembler)mPreviousInboundFlight[message_seq];
if (reassembler != null)
{
reassembler.ContributeFragment(msg_type, length, buf, off + MessageHeaderLength, fragment_offset,
fragment_length);
checkPreviousFlight = true;
}
}
off += message_length;
len -= message_length;
}
bool result = checkPreviousFlight && CheckAll(mPreviousInboundFlight);
if (result)
{
ResendOutboundFlight();
ResetAll(mPreviousInboundFlight);
}
return(result);
}
internal Message ReceiveMessage()
{
if (mSending)
{
mSending = false;
PrepareInboundFlight();
}
// Check if we already have the next message waiting
{
DtlsReassembler next = (DtlsReassembler)mCurrentInboundFlight[mNextReceiveSeq];
if (next != null)
{
byte[] body = next.GetBodyIfComplete();
if (body != null)
{
mPreviousInboundFlight = null;
return(UpdateHandshakeMessagesDigest(new Message(mNextReceiveSeq++, next.MsgType, body)));
}
}
}
byte[] buf = null;
// TODO Check the conditions under which we should reset this
int readTimeoutMillis = 1000;
for (;;)
{
int receiveLimit = mRecordLayer.GetReceiveLimit();
if (buf == null || buf.Length < receiveLimit)
{
buf = new byte[receiveLimit];
}
// TODO Handle records containing multiple handshake messages
try
{
for (; ;)
{
int received = mRecordLayer.Receive(buf, 0, receiveLimit, readTimeoutMillis);
if (received < 0)
{
break;
}
if (received < 12)
{
continue;
}
int fragment_length = TlsUtilities.ReadUint24(buf, 9);
if (received != (fragment_length + 12))
{
continue;
}
int seq = TlsUtilities.ReadUint16(buf, 4);
if (seq > (mNextReceiveSeq + MAX_RECEIVE_AHEAD))
{
continue;
}
byte msg_type = TlsUtilities.ReadUint8(buf, 0);
int length = TlsUtilities.ReadUint24(buf, 1);
int fragment_offset = TlsUtilities.ReadUint24(buf, 6);
if (fragment_offset + fragment_length > length)
{
continue;
}
if (seq < mNextReceiveSeq)
{
/*
* NOTE: If we Receive the previous flight of incoming messages in full
* again, retransmit our last flight
*/
if (mPreviousInboundFlight != null)
{
DtlsReassembler reassembler = (DtlsReassembler)mPreviousInboundFlight[seq];
if (reassembler != null)
{
reassembler.ContributeFragment(msg_type, length, buf, 12, fragment_offset,
fragment_length);
if (CheckAll(mPreviousInboundFlight))
{
ResendOutboundFlight();
/*
* TODO[DTLS] implementations SHOULD back off handshake packet
* size during the retransmit backoff.
*/
readTimeoutMillis = System.Math.Min(readTimeoutMillis * 2, 60000);
ResetAll(mPreviousInboundFlight);
}
}
}
}
else
{
DtlsReassembler reassembler = (DtlsReassembler)mCurrentInboundFlight[seq];
if (reassembler == null)
{
reassembler = new DtlsReassembler(msg_type, length);
mCurrentInboundFlight[seq] = reassembler;
}
reassembler.ContributeFragment(msg_type, length, buf, 12, fragment_offset, fragment_length);
if (seq == mNextReceiveSeq)
{
byte[] body = reassembler.GetBodyIfComplete();
if (body != null)
{
mPreviousInboundFlight = null;
return(UpdateHandshakeMessagesDigest(new Message(mNextReceiveSeq++,
reassembler.MsgType, body)));
}
}
}
}
}
catch (IOException)
{
// NOTE: Assume this is a timeout for the moment
}
ResendOutboundFlight();
/*
* TODO[DTLS] implementations SHOULD back off handshake packet size during the
* retransmit backoff.
*/
readTimeoutMillis = System.Math.Min(readTimeoutMillis * 2, 60000);
}
}
internal DtlsReliableHandshake.Message ReceiveMessage()
{
if (this.mSending)
{
this.mSending = false;
this.PrepareInboundFlight();
}
DtlsReassembler dtlsReassembler = (DtlsReassembler)this.mCurrentInboundFlight[this.mNextReceiveSeq];
if (dtlsReassembler != null)
{
byte[] bodyIfComplete = dtlsReassembler.GetBodyIfComplete();
if (bodyIfComplete != null)
{
this.mPreviousInboundFlight = null;
return(this.UpdateHandshakeMessagesDigest(new DtlsReliableHandshake.Message(this.mNextReceiveSeq++, dtlsReassembler.MsgType, bodyIfComplete)));
}
}
byte[] array = null;
int num = 1000;
DtlsReliableHandshake.Message result;
while (true)
{
int receiveLimit = this.mRecordLayer.GetReceiveLimit();
if (array != null && array.Length >= receiveLimit)
{
goto IL_92;
}
array = new byte[receiveLimit];
try
{
DtlsReassembler dtlsReassembler3;
byte[] bodyIfComplete2;
while (true)
{
IL_92:
int num2 = this.mRecordLayer.Receive(array, 0, receiveLimit, num);
if (num2 < 0)
{
goto IL_214;
}
if (num2 >= 12)
{
int num3 = TlsUtilities.ReadUint24(array, 9);
if (num2 == num3 + 12)
{
int num4 = TlsUtilities.ReadUint16(array, 4);
if (num4 <= this.mNextReceiveSeq + 10)
{
byte msg_type = TlsUtilities.ReadUint8(array, 0);
int num5 = TlsUtilities.ReadUint24(array, 1);
int num6 = TlsUtilities.ReadUint24(array, 6);
if (num6 + num3 <= num5)
{
if (num4 < this.mNextReceiveSeq)
{
if (this.mPreviousInboundFlight != null)
{
DtlsReassembler dtlsReassembler2 = (DtlsReassembler)this.mPreviousInboundFlight[num4];
if (dtlsReassembler2 != null)
{
dtlsReassembler2.ContributeFragment(msg_type, num5, array, 12, num6, num3);
if (DtlsReliableHandshake.CheckAll(this.mPreviousInboundFlight))
{
this.ResendOutboundFlight();
num = Math.Min(num * 2, 60000);
DtlsReliableHandshake.ResetAll(this.mPreviousInboundFlight);
}
}
}
}
else
{
dtlsReassembler3 = (DtlsReassembler)this.mCurrentInboundFlight[num4];
if (dtlsReassembler3 == null)
{
dtlsReassembler3 = new DtlsReassembler(msg_type, num5);
this.mCurrentInboundFlight[num4] = dtlsReassembler3;
}
dtlsReassembler3.ContributeFragment(msg_type, num5, array, 12, num6, num3);
if (num4 == this.mNextReceiveSeq)
{
bodyIfComplete2 = dtlsReassembler3.GetBodyIfComplete();
if (bodyIfComplete2 != null)
{
break;
}
}
}
}
}
}
}
}
this.mPreviousInboundFlight = null;
result = this.UpdateHandshakeMessagesDigest(new DtlsReliableHandshake.Message(this.mNextReceiveSeq++, dtlsReassembler3.MsgType, bodyIfComplete2));
break;
IL_214 :;
}
catch (IOException)
{
}
this.ResendOutboundFlight();
num = Math.Min(num * 2, 60000);
}
return(result);
}
internal Message ReceiveMessage()
{
if (mSending)
{
mSending = false;
PrepareInboundFlight();
}
DtlsReassembler dtlsReassembler = (DtlsReassembler)mCurrentInboundFlight.get_Item((object)mNextReceiveSeq);
if (dtlsReassembler != null)
{
byte[] bodyIfComplete = dtlsReassembler.GetBodyIfComplete();
if (bodyIfComplete != null)
{
mPreviousInboundFlight = null;
return(UpdateHandshakeMessagesDigest(new Message(mNextReceiveSeq++, dtlsReassembler.MsgType, bodyIfComplete)));
}
}
byte[] array = null;
int num = 1000;
while (true)
{
int receiveLimit = mRecordLayer.GetReceiveLimit();
if (array == null || array.Length < receiveLimit)
{
array = new byte[receiveLimit];
}
try
{
while (true)
{
int num2 = mRecordLayer.Receive(array, 0, receiveLimit, num);
if (num2 < 0)
{
break;
}
if (num2 < 12)
{
continue;
}
int num3 = TlsUtilities.ReadUint24(array, 9);
if (num2 != num3 + 12)
{
continue;
}
int num4 = TlsUtilities.ReadUint16(array, 4);
if (num4 > mNextReceiveSeq + 10)
{
continue;
}
byte msg_type = TlsUtilities.ReadUint8(array, 0);
int num5 = TlsUtilities.ReadUint24(array, 1);
int num6 = TlsUtilities.ReadUint24(array, 6);
if (num6 + num3 > num5)
{
continue;
}
if (num4 < mNextReceiveSeq)
{
if (mPreviousInboundFlight == null)
{
continue;
}
DtlsReassembler dtlsReassembler2 = (DtlsReassembler)mPreviousInboundFlight.get_Item((object)num4);
if (dtlsReassembler2 != null)
{
dtlsReassembler2.ContributeFragment(msg_type, num5, array, 12, num6, num3);
if (CheckAll(mPreviousInboundFlight))
{
ResendOutboundFlight();
num = Math.Min(num * 2, 60000);
ResetAll(mPreviousInboundFlight);
}
}
continue;
}
DtlsReassembler dtlsReassembler3 = (DtlsReassembler)mCurrentInboundFlight.get_Item((object)num4);
if (dtlsReassembler3 == null)
{
dtlsReassembler3 = new DtlsReassembler(msg_type, num5);
mCurrentInboundFlight.set_Item((object)num4, (object)dtlsReassembler3);
}
dtlsReassembler3.ContributeFragment(msg_type, num5, array, 12, num6, num3);
if (num4 == mNextReceiveSeq)
{
byte[] bodyIfComplete2 = dtlsReassembler3.GetBodyIfComplete();
if (bodyIfComplete2 != null)
{
mPreviousInboundFlight = null;
return(UpdateHandshakeMessagesDigest(new Message(mNextReceiveSeq++, dtlsReassembler3.MsgType, bodyIfComplete2)));
}
}
}
}
catch (IOException)
{
}
ResendOutboundFlight();
num = Math.Min(num * 2, 60000);
}
}