Attached Devices Javascript Error

The story is almost as old as the many attempts to derive Attached Devices lists and the like from the DHCP/BOOTP client provied host name.

Root cause: RFC ignorants! When walking the RFC trees for DHCP, BOOTP et all, one does come to RFC 1035, where it says:

The labels must follow the rules for ARPANET host names.  They must
start with a letter, end with a letter or digit, and have as interior
characters only letters, digits, and hyphen.  There are also some
restrictions on the length.  Labels must be 63 characters or less.

My Google Pixel phone (Device Name) is named "Pixel 4a (5G)". It's dhcpd does provide the host name as part of the request as "pixel-4a-5g". When I find device like "Cath's iPhone 12" in the same context, you might understand what I'm thinking about that other Californian company.... And then, for some reson my defintion for small devices with Internet access are IoJ.

Second line of defense:

Already the router DHCP server should normalize and validate data provided - before it's stored in some internal table. Otherwise some bad guys might come and inject some 63 (or even more?) chars with JavaScript, or whatever interesting ideas. This table can be read then to generate the JSON ... and magic, it would just work, always.

So of course, I'm fully with you efc .

Regards,

-Kurt