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DISCONNECT packet should allow zero-length body (#1994)

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* DISCONNECT packet should allow zero-length body

> [If the Remaining Length is less than 1 the value of 0x00 (Normal disconnection) is used.](https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901208)

* Update release notes and add comment

---------

Co-authored-by: Christian <6939810+chkr1011@users.noreply.github.com>
This commit is contained in:
yzt
2024-05-14 18:08:54 +02:00
committed by GitHub
co-authored by Christian
parent 473f9c31b1
commit b4769778af
2 changed files with 15 additions and 5 deletions
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.github/workflows/ReleaseNotes.md
+1
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@@ -1,5 +1,6 @@
* [Core] Optimized packet serialization of PUBACK and PUBREC packets for protocol version 5.0.0 (#1939, thanks to @Y-Sindo).
* [Core] The package inspector is now fully async (#1941).
* [Core] Fixed decoding of DISCONNECT packet with empty body (#1994, thanks to @Y-Sindo).
* [Client] Added a dedicated exception when the client is not connected (#1954, thanks to @marcpiulachs).
* [Client] The client will now throw a _MqttClientUnexpectedDisconnectReceivedException_ when publishing a QoS 0 message which leads to a server disconnect (BREAKING CHANGE!, #1974, thanks to @fazho).
* [Client] Exposed the certificate selection event handler in client options (#1984).
Source/MQTTnet/Formatter/V5/MqttV5PacketDecoder.cs
+14 -5
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@@ -220,7 +220,7 @@ namespace MQTTnet.Formatter.V5
var packet = new MqttConnectPacket
{
// If the Request Problem Information is absent, the value of 1 is used.
RequestProblemInformation = true
RequestProblemInformation = true
};
var protocolName = _bufferReader.ReadString();
@@ -352,7 +352,16 @@ namespace MQTTnet.Formatter.V5
MqttPacket DecodeDisconnectPacket(ArraySegment<byte> body)
{
ThrowIfBodyIsEmpty(body);
// From RFC: 3.14.2.1 Disconnect Reason Code
// Byte 1 in the Variable Header is the Disconnect Reason Code.
// If the Remaining Length is less than 1 the value of 0x00 (Normal disconnection) is used.
if (body.Count == 0)
{
return new MqttDisconnectPacket
{
ReasonCode = MqttDisconnectReasonCode.NormalDisconnection
};
}
_bufferReader.SetBuffer(body.Array, body.Offset, body.Count);
@@ -386,7 +395,7 @@ namespace MQTTnet.Formatter.V5
return packet;
}
MqttPacket DecodePubAckPacket(ArraySegment<byte> body)
{
ThrowIfBodyIsEmpty(body);
@@ -724,7 +733,7 @@ namespace MQTTnet.Formatter.V5
packet.UserProperties = propertiesReader.CollectedUserProperties;
packet.ReasonCodes = new List<MqttUnsubscribeReasonCode>(_bufferReader.BytesLeft);
while (!_bufferReader.EndOfStream)
{
var reasonCode = (MqttUnsubscribeReasonCode)_bufferReader.ReadByte();
@@ -770,4 +779,4 @@ namespace MQTTnet.Formatter.V5
}
}
}
}
}