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https://issues.apache.org/jira/browse/PROTON-235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ken Giusti resolved PROTON-235.
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    Resolution: Fixed

http://svn.apache.org/viewvc?view=revision&revision=1446697
                
> SASL layer can "replicate" inbound SASL frames under some circumstances.
> ------------------------------------------------------------------------
>
>                 Key: PROTON-235
>                 URL: https://issues.apache.org/jira/browse/PROTON-235
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>    Affects Versions: 0.3
>            Reporter: Ken Giusti
>            Assignee: Ken Giusti
>             Fix For: 0.4
>
>
> If an inbound SASL frame is fragmented, then the SASL layer incorrectly 
> re-reads the same frame data.  This causes the engine to fail.
> Reproducer:
>   def testFracturedSASL(self):
>     self.s1.mechanisms("ANONYMOUS")
>     self.s1.client()
>     self.t1.trace(Transport.TRACE_FRM)
>     out = self.t1.output(1024)
>     print("out=%s" % str(out))
>     self.t1.input("AMQP\x03\x01\x00\x00")
>     out = self.t1.output(1024)
>     print("out=%s" % str(out))
>     self.t1.input("\x00\x00\x00")
>     out = self.t1.output(1024)
>     print("out=%s" % str(out))
>     
> self.t1.input("A\x02\x01\x00\x00\x00S@\xc04\x01\xe01\x06\xa3\x06GSSAPI\x05PLAIN\x0aDIGEST-MD5\x08AMQPLAIN\x08CRAM-MD5\x04NTLM")
>     out = self.t1.output(1024)
>     print("out=%s" % str(out))
>     self.t1.input("\x00\x00\x00\x10\x02\x01\x00\x00\x00SD\xc0\x03\x01P\x00")
>     out = self.t1.output(1024)
>     while out:
>       print("out=%s" % str(out))
>       out = self.t1.output(1024)
> When tracing is turned on, SASL will report the following frames as received:
> <- SASL
> [0x200f0e0:0] <- SASL-MECHANISMS @64 [@PN_SYMBOL[:GSSAPI, :PLAIN, 
> :"DIGEST-MD5", :AMQPLAIN, :"CRAM-MD5", :NTLM]]
> [0x200f0e0:0] <- SASL-MECHANISMS @64 [@PN_SYMBOL[:GSSAPI, :PLAIN, 
> :"DIGEST-MD5", :AMQPLAIN, :"CRAM-MD5", :NTLM]]
> Notice the MECHANISM frame is reported as received twice by the SASL layer, 
> but it was only read once from the network.

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