BIND 9 Patch


Overview

The BIND 9 patch file included in the mDNkit provides the ability to support both conventional ASCII character domain names and non-ASCII character-derived multilingual domain names.

Specifically, this patch adds the following functions to BIND 9.

Instructions for how to apply the patch file to BIND 9 is explained at the beginning of the patch file. Before using the patch file, be sure to check the version of BIND being used.


Architecture

BIND 9 included in mDNkit version 1 provides the following functgions in addition to the functions explained in the Overview.

This method, which implements multilingual domain name processing such as normilization or encoding conversion in the resolver layer, and which enables to deal UTF-8 characters on DNS protocol, is becoming a prominent architecture for multilingual domain name processing. IDNA prescribes to perform all processing in the application, and to use ACE encoding on DNS protocol. mDNkit version 2 complies with IDNA. For that reason, the above functions are removed from BIND 9 patch.

The following diagram shows the function implemented in each component and the encoding used by the interface between the components.

bind9 resolver architecture


Fixes in dig/host/nslookup

The DNS inquiry commands called dig, host, and nslookup are included in BIND 9. Because of the BIND 9 patch in mDNkit, these commands can handle multilingual domain names. Specifically, the following functions are added.

The res module of the MDN library is used for processing. The mDNkit configuration file is used to make the setting.