[Bug 1849644] [NEW] QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Bug 1849644] [NEW] QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Samuel]

Public bug reported:

When running a machine using "-vnc" and the "websocket" option QEMU
seems to require the subprotocol called 'binary'. This subprotocol does
not exist in the WebSocket specification. In fact it has never existed
in the spec, in one of the very early drafts of WebSockets it was
briefly mentioned but it never made it to a final version.

When the WebSocket server requires a non-standard subprotocol any
WebSocket client that works correctly won't be able to connect.

One example of such a client is noVNC, it tells the server that it
doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't let
noVNC connect. If noVNC is modified to ask for 'binary' it will work,
this is, however, incorrect behavior.

Looking at the code in "io/channel-websock.c" it seems it's quite hard-
coded to binary:

Look at line 58 and 433 here:
https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

This code has to be made more dynamic, and shouldn't require binary.

** Affects: qemu
     Importance: Undecided
         Status: New

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  New

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Daniel Berrange]

It isn't mandatory to use a standardized subprotocol, all that's
required is that the client & server agree

  https://developer.mozilla.org/en-
US/docs/Web/HTTP/Protocol_upgrade_mechanism

  "The subprotocols may be selected from the IANA WebSocket Subprotocol
Name Registry or may be a custom name jointly understood by the client
and the server."

QEMU used/required 'binary' because that is what noVNC used when the
QEMU websockets code was first implemented.

It appears that noVNC was changed though to not send a "binary"
subprotocol in

  commit f8318361b1b62c4d76b091132d4a8ccfdd2957e4
  Author: Pierre Ossman <ossman@cendio.se>
  Date:   Sat Oct 14 12:45:56 2017 +0200

    Remove wsProtocols setting
    
    It isn't in use anymore since we deprecated support for Base64 mode.

>From QEMU's POV looks like we'll need to tweak code to treat 'binary'
and no sub-protocol as being equivalent.

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  New

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Samuel]

Thank you for your response, Daniel!

Do you think this is something you will have the opportunity to look at
soon?

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  New

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[yuchenlin]

I have sent a patch about this problem.

Please see https://lists.nongnu.org/archive/html/qemu-
devel/2019-11/msg03924.html

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  New

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Samuel]

Did anyone at QEMU get a chance to look at that patch?

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  New

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[yuchenlin]

Hi, Samuel

This patch has been viewed by Daniel.
Please see https://lists.nongnu.org/archive/html/qemu-devel/2019-12/msg00264.html

However, Daniel has not sent a PR which includes this patch.

Thanks.

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  New

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Samuel]

Ok, thanks!

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  New

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Daniel Berrange]

** Changed in: qemu
       Status: New => Fix Committed

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Committed

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Laurent Vivier]

Fixed here:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=c64e1e75381d

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Committed

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Laurent Vivier]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Christian Ehrhardt ]

This is in v5.0.0 so fixed in Groovy.
The related noVNC change is in upstream version >=v1.0.0 which correlates with Ubuntu >=20.04, threfore fixing this in Focals Qemu seems good.

** Also affects: qemu (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: qemu (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: qemu (Ubuntu)
       Status: New => Fix Released

** Changed in: qemu (Ubuntu Focal)
       Status: New => Confirmed

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  Confirmed

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Christian Ehrhardt ]

Repro steps:
$ sudo apt install qemu-system-x86 novnc
/usr/share/novnc
python3 -m http.server

Connect browser to http://<IP>:8000/vnc.html
  Click "Settings"
  Open "advanced"
  Open "websocket"
  Set port 5700
  Clear path
  Click "Connect"

And it works ...

Turns out my former check on the offending noVNC commit was wrong.
There are
https://github.com/novnc/noVNC/commit/f8318361b1b62c4d76b091132d4a8ccfdd2957e4 (referenced on this bug before)
$ git tag --contains f8318361b1b62c4d76b091132d4a8ccfdd2957e4
v1.0.0
But only really gone later with:
https://github.com/novnc/noVNC/commit/c912230309806aacbae4295faf7ad6406da97617
$ git tag --contains c912230309806aacbae4295faf7ad6406da97617
v1.2.0

So the novnc of Focal isn't affected but anyone who uses a newer noVNC >=1.2 would be.
=> lower SRU priority
=> Modify above repro steps to not use noVNC from Focal via apt but use 1.2 from snaps


Repro steps:
$ snap install novnc
$ novnc --vnc localhost:5700
Connect browser to http://<IP>:6080/vnc.html
Click "Connect"

TODO: repro steps to be verified with a qemu that has the fix applied

** Changed in: qemu (Ubuntu Focal)
   Importance: Undecided => Low

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  Confirmed

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Christian Ehrhardt ]

I can confirm the test steps mentioned above. In an unchanged scenario a
formerly failing-to-connect case got working when replacing the qemu (on
Focal) in use with a patched one.

Adding an SRU Template for Focal to the bug description ...

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Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  Confirmed

Bug description:
  When running a machine using "-vnc" and the "websocket" option QEMU
  seems to require the subprotocol called 'binary'. This subprotocol
  does not exist in the WebSocket specification. In fact it has never
  existed in the spec, in one of the very early drafts of WebSockets it
  was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Christian Ehrhardt ]

** Description changed:

- When running a machine using "-vnc" and the "websocket" option QEMU
- seems to require the subprotocol called 'binary'. This subprotocol does
- not exist in the WebSocket specification. In fact it has never existed
- in the spec, in one of the very early drafts of WebSockets it was
- briefly mentioned but it never made it to a final version.
+ [Impact]
+ 
+  * The exact details of the protocol/subprotocal was slightly unclear
+    between the projects. So qemu ended up insisting on "binary" being
+    used but newer noVNC clients no more used it.
+ 
+  * Qemu got fixed in 5.0 to be more tolerant and accept an empty sub-
+    protocol as well. This SRU backports that fix to Focal.
+ 
+ [Test Case]
+ 
+  * Without the fix the following will "Failed to connect", but with the
+ fix it will work.
+ 
+ $ sudo apt install qemu-system-x86
+ # will only boot into a failing bootloader, but that is enough
+ $ qemu-system-x86_64 -vnc :0,websocket
+ # We need version 1.2 or later, so use the snap
+ $ snap install novnc
+ $ novnc --vnc localhost:5700
+ Connect browser to http://<IP>:6080/vnc.html
+ Click "Connect"
+ 
+  * Cross check with an older noVNC (e.g. the one in Focal) if the 
+    connectivity still works on those as well
+ 
+    - Reminders when switching between the noVNC implementations
+      - always refresh the browser with all clear ctrl+alt+f5
+      - start/stop the snapped one via snap.novnc.novncsvc.service
+ 
+ [Regression Potential]
+ 
+  * This is exclusive to the functionality of noVNC, so regressions would 
+    have to be expected in there. The tests try to exercise the basics, but
+    e.g. Openstack would be a major product using 
+ 
+ [Other Info]
+  
+  * The noVNC in Focal itself does not yet have the offending change, but
+    we want the qemu in focal to be connecteable from ~any type of client
+ 
+ 
+ ---
+ 
+ 
+ 
+ When running a machine using "-vnc" and the "websocket" option QEMU seems to require the subprotocol called 'binary'. This subprotocol does not exist in the WebSocket specification. In fact it has never existed in the spec, in one of the very early drafts of WebSockets it was briefly mentioned but it never made it to a final version.
  
  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.
  
  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't let
  noVNC connect. If noVNC is modified to ask for 'binary' it will work,
  this is, however, incorrect behavior.
  
  Looking at the code in "io/channel-websock.c" it seems it's quite hard-
  coded to binary:
  
  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c
  
  This code has to be made more dynamic, and shouldn't require binary.

** Changed in: qemu (Ubuntu Focal)
       Status: Confirmed => Triaged

** Changed in: qemu (Ubuntu Focal)
       Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/1849644

Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  In Progress

Bug description:
  [Impact]

   * The exact details of the protocol/subprotocal was slightly unclear
     between the projects. So qemu ended up insisting on "binary" being
     used but newer noVNC clients no more used it.

   * Qemu got fixed in 5.0 to be more tolerant and accept an empty sub-
     protocol as well. This SRU backports that fix to Focal.

  [Test Case]

   * Without the fix the following will "Failed to connect", but with
  the fix it will work.

  $ sudo apt install qemu-system-x86
  # will only boot into a failing bootloader, but that is enough
  $ qemu-system-x86_64 -vnc :0,websocket
  # We need version 1.2 or later, so use the snap
  $ snap install novnc
  $ novnc --vnc localhost:5700
  Connect browser to http://<IP>:6080/vnc.html
  Click "Connect"

   * Cross check with an older noVNC (e.g. the one in Focal) if the 
     connectivity still works on those as well

     - Reminders when switching between the noVNC implementations
       - always refresh the browser with all clear ctrl+alt+f5
       - start/stop the snapped one via snap.novnc.novncsvc.service

  [Regression Potential]

   * This is exclusive to the functionality of noVNC, so regressions would 
     have to be expected in there. The tests try to exercise the basics, but
     e.g. Openstack would be a major product using 

  [Other Info]
   
   * The noVNC in Focal itself does not yet have the offending change, but
     we want the qemu in focal to be connecteable from ~any type of client


  ---


  
  When running a machine using "-vnc" and the "websocket" option QEMU seems to require the subprotocol called 'binary'. This subprotocol does not exist in the WebSocket specification. In fact it has never existed in the spec, in one of the very early drafts of WebSockets it was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1849644/+subscriptions

[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/391348

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https://bugs.launchpad.net/bugs/1849644

Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  In Progress

Bug description:
  [Impact]

   * The exact details of the protocol/subprotocal was slightly unclear
     between the projects. So qemu ended up insisting on "binary" being
     used but newer noVNC clients no more used it.

   * Qemu got fixed in 5.0 to be more tolerant and accept an empty sub-
     protocol as well. This SRU backports that fix to Focal.

  [Test Case]

   * Without the fix the following will "Failed to connect", but with
  the fix it will work.

  $ sudo apt install qemu-system-x86
  # will only boot into a failing bootloader, but that is enough
  $ qemu-system-x86_64 -vnc :0,websocket
  # We need version 1.2 or later, so use the snap
  $ snap install novnc
  $ novnc --vnc localhost:5700
  Connect browser to http://<IP>:6080/vnc.html
  Click "Connect"

   * Cross check with an older noVNC (e.g. the one in Focal) if the 
     connectivity still works on those as well

     - Reminders when switching between the noVNC implementations
       - always refresh the browser with all clear ctrl+alt+f5
       - start/stop the snapped one via snap.novnc.novncsvc.service

  [Regression Potential]

   * This is exclusive to the functionality of noVNC, so regressions would 
     have to be expected in there. The tests try to exercise the basics, but
     e.g. Openstack would be a major product using 

  [Other Info]
   
   * The noVNC in Focal itself does not yet have the offending change, but
     we want the qemu in focal to be connecteable from ~any type of client


  ---


  
  When running a machine using "-vnc" and the "websocket" option QEMU seems to require the subprotocol called 'binary'. This subprotocol does not exist in the WebSocket specification. In fact it has never existed in the spec, in one of the very early drafts of WebSockets it was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1849644/+subscriptions

[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Christian Ehrhardt ]

SRU Template for qemu added and MP linked to fix this in Ubuntu 20.04

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https://bugs.launchpad.net/bugs/1849644

Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  In Progress

Bug description:
  [Impact]

   * The exact details of the protocol/subprotocal was slightly unclear
     between the projects. So qemu ended up insisting on "binary" being
     used but newer noVNC clients no more used it.

   * Qemu got fixed in 5.0 to be more tolerant and accept an empty sub-
     protocol as well. This SRU backports that fix to Focal.

  [Test Case]

   * Without the fix the following will "Failed to connect", but with
  the fix it will work.

  $ sudo apt install qemu-system-x86
  # will only boot into a failing bootloader, but that is enough
  $ qemu-system-x86_64 -vnc :0,websocket
  # We need version 1.2 or later, so use the snap
  $ snap install novnc
  $ novnc --vnc localhost:5700
  Connect browser to http://<IP>:6080/vnc.html
  Click "Connect"

   * Cross check with an older noVNC (e.g. the one in Focal) if the 
     connectivity still works on those as well

     - Reminders when switching between the noVNC implementations
       - always refresh the browser with all clear ctrl+alt+f5
       - start/stop the snapped one via snap.novnc.novncsvc.service

  [Regression Potential]

   * This is exclusive to the functionality of noVNC, so regressions would 
     have to be expected in there. The tests try to exercise the basics, but
     e.g. Openstack would be a major product using 

  [Other Info]
   
   * The noVNC in Focal itself does not yet have the offending change, but
     we want the qemu in focal to be connecteable from ~any type of client


  ---


  
  When running a machine using "-vnc" and the "websocket" option QEMU seems to require the subprotocol called 'binary'. This subprotocol does not exist in the WebSocket specification. In fact it has never existed in the spec, in one of the very early drafts of WebSockets it was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1849644/+subscriptions

[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Robie Basak]

Hello Samuel, or anyone else affected,

Accepted qemu into focal-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/qemu/1:4.2-3ubuntu6.7
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: qemu (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1849644

Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  Fix Committed

Bug description:
  [Impact]

   * The exact details of the protocol/subprotocal was slightly unclear
     between the projects. So qemu ended up insisting on "binary" being
     used but newer noVNC clients no more used it.

   * Qemu got fixed in 5.0 to be more tolerant and accept an empty sub-
     protocol as well. This SRU backports that fix to Focal.

  [Test Case]

   * Without the fix the following will "Failed to connect", but with
  the fix it will work.

  $ sudo apt install qemu-system-x86
  # will only boot into a failing bootloader, but that is enough
  $ qemu-system-x86_64 -vnc :0,websocket
  # We need version 1.2 or later, so use the snap
  $ snap install novnc
  $ novnc --vnc localhost:5700
  Connect browser to http://<IP>:6080/vnc.html
  Click "Connect"

   * Cross check with an older noVNC (e.g. the one in Focal) if the 
     connectivity still works on those as well

     - Reminders when switching between the noVNC implementations
       - always refresh the browser with all clear ctrl+alt+f5
       - start/stop the snapped one via snap.novnc.novncsvc.service

  [Regression Potential]

   * This is exclusive to the functionality of noVNC, so regressions would 
     have to be expected in there. The tests try to exercise the basics, but
     e.g. Openstack would be a major product using 

  [Other Info]
   
   * The noVNC in Focal itself does not yet have the offending change, but
     we want the qemu in focal to be connecteable from ~any type of client


  ---


  
  When running a machine using "-vnc" and the "websocket" option QEMU seems to require the subprotocol called 'binary'. This subprotocol does not exist in the WebSocket specification. In fact it has never existed in the spec, in one of the very early drafts of WebSockets it was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1849644/+subscriptions

[Bug 1849644] Autopkgtest regression report (qemu/1:4.2-3ubuntu6.7)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted qemu (1:4.2-3ubuntu6.7) for focal have finished running.
The following regressions have been reported in tests triggered by the package:

casper/1.445.1 (amd64)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/focal/update_excuses.html#qemu

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1849644

Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  Fix Committed

Bug description:
  [Impact]

   * The exact details of the protocol/subprotocal was slightly unclear
     between the projects. So qemu ended up insisting on "binary" being
     used but newer noVNC clients no more used it.

   * Qemu got fixed in 5.0 to be more tolerant and accept an empty sub-
     protocol as well. This SRU backports that fix to Focal.

  [Test Case]

   * Without the fix the following will "Failed to connect", but with
  the fix it will work.

  $ sudo apt install qemu-system-x86
  # will only boot into a failing bootloader, but that is enough
  $ qemu-system-x86_64 -vnc :0,websocket
  # We need version 1.2 or later, so use the snap
  $ snap install novnc
  $ novnc --vnc localhost:5700
  Connect browser to http://<IP>:6080/vnc.html
  Click "Connect"

   * Cross check with an older noVNC (e.g. the one in Focal) if the 
     connectivity still works on those as well

     - Reminders when switching between the noVNC implementations
       - always refresh the browser with all clear ctrl+alt+f5
       - start/stop the snapped one via snap.novnc.novncsvc.service

  [Regression Potential]

   * This is exclusive to the functionality of noVNC, so regressions would 
     have to be expected in there. The tests try to exercise the basics, but
     e.g. Openstack would be a major product using 

  [Other Info]
   
   * The noVNC in Focal itself does not yet have the offending change, but
     we want the qemu in focal to be connecteable from ~any type of client


  ---


  
  When running a machine using "-vnc" and the "websocket" option QEMU seems to require the subprotocol called 'binary'. This subprotocol does not exist in the WebSocket specification. In fact it has never existed in the spec, in one of the very early drafts of WebSockets it was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1849644/+subscriptions

[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Christian Ehrhardt ]

Trying to connect using
novnc   latest/stable:    1.2.0      2020-07-31 (6) 18MB -

as-is failing to connect
Keeping VNC up and refreshing qemu.


Updating to the new qemu from focal proposed (by now resolved the archive publishing issues we had before this morning).
Get:67 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 qemu-utils amd64 1:4.2-3ubuntu6.7 [975 kB]                                                                                  
Get:68 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 qemu-system-common amd64 1:4.2-3ubuntu6.7 [1056 kB]                                                                         
Get:69 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 qemu-block-extra amd64 1:4.2-3ubuntu6.7 [53.8 kB]                                                                           
Get:70 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 qemu-system-data all 1:4.2-3ubuntu6.7 [563 kB]                                                                              
Get:71 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 qemu-kvm amd64 1:4.2-3ubuntu6.7 [13.1 kB]                                                                                   
Get:72 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 qemu-system-x86 amd64 1:4.2-3ubuntu6.7 [6720 kB]                                                                            
Get:73 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 qemu-system-gui amd64 1:4.2-3ubuntu6.7 [40.8 kB]                                                                            
Get:74 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 qemu-system-mips amd64 1:4.2-3ubuntu6.7 [12.9 MB]


Now the same novnc1.2 can connect to it \o/
Setting verified

** Tags removed: verification-needed verification-needed-focal
** Tags added: verification-done verification-done-focal

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1849644

Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  Fix Committed

Bug description:
  [Impact]

   * The exact details of the protocol/subprotocal was slightly unclear
     between the projects. So qemu ended up insisting on "binary" being
     used but newer noVNC clients no more used it.

   * Qemu got fixed in 5.0 to be more tolerant and accept an empty sub-
     protocol as well. This SRU backports that fix to Focal.

  [Test Case]

   * Without the fix the following will "Failed to connect", but with
  the fix it will work.

  $ sudo apt install qemu-system-x86
  # will only boot into a failing bootloader, but that is enough
  $ qemu-system-x86_64 -vnc :0,websocket
  # We need version 1.2 or later, so use the snap
  $ snap install novnc
  $ novnc --vnc localhost:5700
  Connect browser to http://<IP>:6080/vnc.html
  Click "Connect"

   * Cross check with an older noVNC (e.g. the one in Focal) if the 
     connectivity still works on those as well

     - Reminders when switching between the noVNC implementations
       - always refresh the browser with all clear ctrl+alt+f5
       - start/stop the snapped one via snap.novnc.novncsvc.service

  [Regression Potential]

   * This is exclusive to the functionality of noVNC, so regressions would 
     have to be expected in there. The tests try to exercise the basics, but
     e.g. Openstack would be a major product using 

  [Other Info]
   
   * The noVNC in Focal itself does not yet have the offending change, but
     we want the qemu in focal to be connecteable from ~any type of client


  ---


  
  When running a machine using "-vnc" and the "websocket" option QEMU seems to require the subprotocol called 'binary'. This subprotocol does not exist in the WebSocket specification. In fact it has never existed in the spec, in one of the very early drafts of WebSockets it was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1849644/+subscriptions

[Bug 1849644] Re: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

[Launchpad Bug Tracker]

This bug was fixed in the package qemu - 1:4.2-3ubuntu6.7

---------------
qemu (1:4.2-3ubuntu6.7) focal; urgency=medium

  * d/p/ubuntu/lp-1882774-*: add newer EPYC processor types (LP: #1887490)
  * d/p/u/lp-1896751-exec-rom_reset-Free-rom-data-during-inmigrate-skip.patch:
    fix reboot after migration (LP: #1896751)
  * d/p/u/lp-1849644-io-channel-websock-treat-binary-and-no-sub-protocol-.patch:
    fix websocket compatibility with newer versions of noVNC (LP: #1849644)

 -- Christian Ehrhardt <christian.ehrhardt@canonical.com>  Mon, 27 Jul
2020 11:45:26 +0200

** Changed in: qemu (Ubuntu Focal)
       Status: Fix Committed => Fix Released

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1849644

Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  Fix Released

Bug description:
  [Impact]

   * The exact details of the protocol/subprotocal was slightly unclear
     between the projects. So qemu ended up insisting on "binary" being
     used but newer noVNC clients no more used it.

   * Qemu got fixed in 5.0 to be more tolerant and accept an empty sub-
     protocol as well. This SRU backports that fix to Focal.

  [Test Case]

   * Without the fix the following will "Failed to connect", but with
  the fix it will work.

  $ sudo apt install qemu-system-x86
  # will only boot into a failing bootloader, but that is enough
  $ qemu-system-x86_64 -vnc :0,websocket
  # We need version 1.2 or later, so use the snap
  $ snap install novnc
  $ novnc --vnc localhost:5700
  Connect browser to http://<IP>:6080/vnc.html
  Click "Connect"

   * Cross check with an older noVNC (e.g. the one in Focal) if the 
     connectivity still works on those as well

     - Reminders when switching between the noVNC implementations
       - always refresh the browser with all clear ctrl+alt+f5
       - start/stop the snapped one via snap.novnc.novncsvc.service

  [Regression Potential]

   * This is exclusive to the functionality of noVNC, so regressions would 
     have to be expected in there. The tests try to exercise the basics, but
     e.g. Openstack would be a major product using 

  [Other Info]
   
   * The noVNC in Focal itself does not yet have the offending change, but
     we want the qemu in focal to be connecteable from ~any type of client


  ---


  
  When running a machine using "-vnc" and the "websocket" option QEMU seems to require the subprotocol called 'binary'. This subprotocol does not exist in the WebSocket specification. In fact it has never existed in the spec, in one of the very early drafts of WebSockets it was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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[Bug 1849644] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for qemu has completed
successfully and the package is now being released to -updates.
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the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
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https://bugs.launchpad.net/bugs/1849644

Title:
  QEMU VNC websocket proxy requires non-standard 'binary' subprotocol

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Focal:
  Fix Released

Bug description:
  [Impact]

   * The exact details of the protocol/subprotocal was slightly unclear
     between the projects. So qemu ended up insisting on "binary" being
     used but newer noVNC clients no more used it.

   * Qemu got fixed in 5.0 to be more tolerant and accept an empty sub-
     protocol as well. This SRU backports that fix to Focal.

  [Test Case]

   * Without the fix the following will "Failed to connect", but with
  the fix it will work.

  $ sudo apt install qemu-system-x86
  # will only boot into a failing bootloader, but that is enough
  $ qemu-system-x86_64 -vnc :0,websocket
  # We need version 1.2 or later, so use the snap
  $ snap install novnc
  $ novnc --vnc localhost:5700
  Connect browser to http://<IP>:6080/vnc.html
  Click "Connect"

   * Cross check with an older noVNC (e.g. the one in Focal) if the 
     connectivity still works on those as well

     - Reminders when switching between the noVNC implementations
       - always refresh the browser with all clear ctrl+alt+f5
       - start/stop the snapped one via snap.novnc.novncsvc.service

  [Regression Potential]

   * This is exclusive to the functionality of noVNC, so regressions would 
     have to be expected in there. The tests try to exercise the basics, but
     e.g. Openstack would be a major product using 

  [Other Info]
   
   * The noVNC in Focal itself does not yet have the offending change, but
     we want the qemu in focal to be connecteable from ~any type of client


  ---


  
  When running a machine using "-vnc" and the "websocket" option QEMU seems to require the subprotocol called 'binary'. This subprotocol does not exist in the WebSocket specification. In fact it has never existed in the spec, in one of the very early drafts of WebSockets it was briefly mentioned but it never made it to a final version.

  When the WebSocket server requires a non-standard subprotocol any
  WebSocket client that works correctly won't be able to connect.

  One example of such a client is noVNC, it tells the server that it
  doesn't want to use any subprotocol. QEMU's WebSocket proxy doesn't
  let noVNC connect. If noVNC is modified to ask for 'binary' it will
  work, this is, however, incorrect behavior.

  Looking at the code in "io/channel-websock.c" it seems it's quite
  hard-coded to binary:

  Look at line 58 and 433 here:
  https://git.qemu.org/?p=qemu.git;a=blob;f=io/channel-websock.c

  This code has to be made more dynamic, and shouldn't require binary.

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