Dhiraj Bokde created AMQ-5058:
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Summary: Broker MUST respond with CONNACK with return code 0x02
for zero length client id and 0 cleansession
Key: AMQ-5058
URL: https://issues.apache.org/jira/browse/AMQ-5058
Project: ActiveMQ
Issue Type: Bug
Components: MQTT
Affects Versions: 5.9.0
Reporter: Dhiraj Bokde
Fix For: 5.10.0
Attachments: AMQ-5058.patch
The CONNECT.decode() method from mqtt-client had an issue which has been fixed
in https://github.com/fusesource/mqtt-client/pull/31
Wit this fix MQTTProtocolConverter.onConnect() can now check for the condition
outlined below and return a CONNACK with return code 0x02.
>From MQTT 3.1.1 draft specification
[MQTT-3.1.3-6] A Server MAY allow a Client to supply a ClientId that has a
length of zero bytes.
However if it does so the Server MUST treat this as a special case and assign a
unique ClientId to that Client. It MUST then process the CONNECT packet as if
the Client had provided that unique ClientId.
[MQTT-3.1.3-7] If the Client supplies a zero-byte ClientId, the Client MUST
also set Clean
Session to 1.
[MQTT-3.1.3-8] If the Client supplies a zero-byte ClientId with Clean Session
set to 0, the Server
MUST respond to the CONNECT Packet with a CONNACK return code 0x02
(Identifier rejected) and then close the Network Connection.
[MQTT-3.1.3-9] If the Server rejects the ClientId it MUST respond to the
CONNECT Packet with
a CONNACK return code 0x02 (Identifier rejected) and then close the Network
Connection.
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