[Dnsmasq-discuss] Fwd: Errors in address FQDN name combinations with hyphens

[Matthias May]

On 23/04/2022 13:14, mito mito wrote:
> 
> Hello Friends,
> 
> I would appreciate your help on this problem.
> 
> I have been using dnsmasq for a couple of years as an home ad/track blocker and in the latest update available for 
> debian bullseye *dnsmasq-base/stable,now 2.85-1 armhf* *dnsmasq/stable, now 2.85-1 all* I have experienced a strange 
> case that occurs with certain combinations of names with a mid-hyphen, an error occurs but not in all cases.
> 
>  From this list
> 
> For example names with double or triple hyphens names with hyphen and dot
> Captura de pantalla de 2022-04-23 13-02-41.png
> 
> In this case the error appears on line 3, if I comment or remove one of the dashes the error appears on line 4 and so on
> 
> However in this case there are no errors
> Captura de pantalla de 2022-04-23 13-06-31.png
> 
> These are lists obtained from https://www.github.developerdan.com/hosts/lists/ads-and-tracking-extended.txt 
> <https://urldefense.com/v3/__https://www.github.developerdan.com/hosts/lists/ads-and-tracking-extended.txt__;!!I9LPvj3b!GXcXLh1UjDjk0CLNJo4MbdVRJ-g7XrEo1jrSlRN6_GN-zYZzo1znzblFhF5Qa-1Mm-QwAlEu2Vo4BhjzvBvimA$>
> 
> Thank you
> Greetings
> 
> _______________________________________________
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> https://urldefense.com/v3/__https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss__;!!I9LPvj3b!GXcXLh1UjDjk0CLNJo4MbdVRJ-g7XrEo1jrSlRN6_GN-zYZzo1znzblFhF5Qa-1Mm-QwAlEu2Vo4Bhjm_yJbNQ$


Hi Mito

RFC 952
   A "name" (Net, Host, Gateway, or Domain name) is a text string up
   to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
   sign (-), and period (.).  Note that periods are only allowed when
   they serve to delimit components of "domain style names".
    No blank or space characters are permitted as part of a
    name. No distinction is made between upper and lower case.  The first
    character must be an alpha character.  The last character must not be
    a minus sign or period.

RFC 1123
   The syntax of a legal Internet host name was specified in RFC-952
   [DNS:4].  One aspect of host name syntax is hereby changed: the
   restriction on the first character is relaxed to allow either a
   letter or a digit.  Host software MUST support this more liberal
   syntax.
   Host software MUST handle host names of up to 63 characters and
   SHOULD handle host names of up to 255 characters.

RFC 5891
   4.2.3.1.  Hyphen Restrictions
   The Unicode string MUST NOT contain "--" (two consecutive hyphens) in
   the third and fourth character positions and MUST NOT start or end
   with a "-" (hyphen).

BR
Matthias
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