D-Bus Spec change: dashes in interface names

Thiago Macieira thiago at kde.org
Sun Oct 15 13:11:18 PDT 2006

Havoc Pennington wrote:
>We forbid other valid domain name characters also, though I grant hyphen
>is likely by far the most common. I would guess Java packages also can't
>have hyphen, though, right? What do people do then?

No, not really. The rules for DNS domain names are specified in STD 3 and 
reflected on RFC 3490 (Internationalizing Domain Names in Applications). 
Quoting from it:

   3. If the UseSTD3ASCIIRules flag is set, then perform these checks:

     (a) Verify the absence of non-LDH ASCII code points; that is, the
         absence of 0..2C, 2E..2F, 3A..40, 5B..60, and 7B..7F.

     (b) Verify the absence of leading and trailing hyphen-minus; that
         is, the absence of U+002D at the beginning and end of the

If we allow [a-zA-Z0-9-]+ for each part, we'll be allowing all the 
hostnames permitted by STD 3. Internationalised domain names may be 
represented in D-Bus by using their ACE (ASCII Compatible Encoding) 
format, if needed be. It won't be pretty, but it will be doable.

On the other hand, you have a point with Java. I'd more important to be 
consistent. If the Java developers are used to replacing '-' with '_', it 
should be ok for us too.

  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
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