[avahi] Re: Avahi daemon dies on certain hostnames

Lennart Poettering lennart at poettering.net
Sat Apr 1 06:29:16 PST 2006

On Sat, 01.04.06 15:18, Iván Sánchez Ortega (i.sanchez at mirame.net) wrote:


> > If so, I don't see such a big problem if we simple refuse to work with badly 
> > configured devices. 
> I don't like that idea much... a "badly configured device" today may be 
> a "device with default config" tomorrow.

hee. working around the bugs of tomorrow already today seems a little
strange to me. ;-)

> You say that escaping the string is not a valid solution, due to the DNS label 
> size limit. But, how about this?:
> if (the label is not a valid UTF8 string)
> {
> 	escape the invalid characters
> 	if (new lenght of the DNS label < 255)
> 		Return the escaped label
> 	else
> 		Ignore this label, log a warning into syslog
> }
> This way, Avahi should work with *most* badly configured devices (as people 
> don't usually use up 256 characters for a device name); and devices 
> with "bad" names, that are too long to be sanitized, will be just
> ignored.

as sebest already mentioned: the limit is 63, not 255. 

The scheme you suggest isn't invertible. There needs to be a way to
detect whether a sanitized string has been escaped or not.


Lennart Poettering; lennart [at] poettering [dot] net
ICQ# 11060553; GPG 0x1A015CC4; http://0pointer.net/lennart/

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