[Xquartz-dev] Fwd: Warning: No xauth data; using fake authentication data, for X11 forwarding

[Jeremy Huddleston]

yep, here's the patch to xauth.  I'll roll this in and commit to git  
as well...

I have your updated X11.app in my local package now.  If someone could  
send me a license file or a README, I'd be very happy =)

--Jeremy

Begin forwarded message:

> From: Martin Costabel <costabel at wanadoo.fr>
> Date: November 13, 2007 02:13:55 PST
> To: Anton Rang <rang at mac.com>
> Cc: X11 List Mailing <x11-users at lists.apple.com>
> Subject: Re: Warning: No xauth data; using fake authentication data,  
> for X11 forwarding
>
> Anton Rang wrote:
>> On Nov 12, 2007, at 10:25 AM, M. Stanley Bubien wrote:
>>>> Unless your X connection is not working, I believe you can safely
>>>> ignore that error message.
>>>
>>> Well, more to the point for me... why does this happen?  It  
>>> certainly
>>> shouldn't, and I've done everything I can to eliminate the message.
>> You can't eliminate it, I suspect.
>> ssh is running the command
>>  xauth list $DISPLAY  (e.g. xauth list /tmp/launch-blah/:0)
>> and xauth is generating the output
>>  xauth: (argv):1:  bad display name "/tmp/launch-blah/:0" in "list"  
>> command
>> I'm not quite sure what the "fix" here is, since the Xauth data  
>> probably
>> isn't generated until the X server starts, which won't happen until  
>> sshd
>> requests that the forwarding happen -- and I think that may be  
>> after the
>> authentication data is transmitted to sshd.
>> Perhaps best would be to simply disable the warning in sshd for  
>> Darwin....
>
> ... or teach xauth about the weird new display names.
>
> Here is a little patch against xauth-X11R7.2-1.0.2 from X11apps-13  
> that
> does this. As before, the warning will only disappear if there is an
> existing ~/.Xauthority file.
>
> -- 
> Martin
>
> diff -ur X11apps-13/xauth/xauth-X11R7.2-1.0.2/process.c  
> X11apps-13_corr/xauth/xauth-X11R7.2-1.0.2/process.c
> --- X11apps-13/xauth/xauth-X11R7.2-1.0.2/process.c	2007-01-09  
> 00:21:24.000000000 +0100
> +++ X11apps-13_corr/xauth/xauth-X11R7.2-1.0.2/process.c	2007-11-13  
> 08:44:28.000000000 +0100
> @@ -485,6 +485,9 @@
>     if (cp && strncmp (cp, "/unix:", 6) == 0)
>       prelen = (cp - displayname);
>
> +    if (strncmp (displayname, "/tmp/launch", 11) == 0)
> +	displayname = strrchr(displayname, '/') + 1;
> +
>     if (!parse_displayname (displayname + ((prelen > 0) ? prelen +  
> 1 : 0),
> 			    &family, &host, &dpynum, &scrnum, &rest)) {
> 	return False;
>
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