[PROTON-1473] [cpp] Cryptic error message when connection fails because server end requires SASL

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: proton-c-0.17.0
• Fix Version/s: proton-c-0.29.0
• Component/s: cpp-binding
• Labels: sasl
• Environment: Fedora 25; Client: examples/cpp/helloworld; Server: Dispatch router listener configured with authenticatePeer: yes and a suitable common sasl mechanism
• Assignee: Andrew Stitcher
• Reporter: Charles E. Rolke
• Created: 09/May/17 21:07
• Updated: 19/Aug/19 10:49
• Resolved: 12/Jul/19 20:06

Description

If you specify the URL with no credentials:

cpp> ./helloworld 192.168.0.16:5674/aaa
amqp:connection:framing-error: AMQP header mismatch: Insufficient data to determine protocol [''] (connection aborted)

This error message is true in a strict sense but does not give a user much of a clue about what's wrong.

The same setup with good URL credentials:

cpp> ./helloworld user:password@192.168.0.16:5674/aaa
Hello World!

The same setup with bad URL credentials:

cpp> ./helloworld user:passwords@192.168.0.16:5674/aaa
amqp:unauthorized-access: Authentication failed [mech=DIGEST-MD5]

This error message is good.