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djbwares version 6

djbwares is now at version 6.

* http://jdebp.eu./Softwares/djbwares/
* http://jdebp.info./Softwares/djbwares/

The main changes here are in dnscache and ftpd.

dnscache now has a built-in AAAA resource record for localhost, like it already had a built-in A resource record. I've slightly improved the way that it caches AAAA resource record sets, to match the way that it was handling A resource record sets. And it now caches SOA resource records. There are also some minor improvements to the logging to decode SRV, A, and AAAA records rather than print them in raw hexadecimal format.

The changes to ftpd were motivated by my pointing several WWW browsers at a publicfile FTP site and discovering that the WWW browsers adhere to the RFCs far less than they used to at the turn of the century. You can read some of the saddening discoveries in the Hall of Shame. I have enhanced publicfile ftpd to support OPTS, FEAT, SIZE, EPSV, and HOST; to interoperate better with some faulty FTP ALGs that cannot cope with an FTP server that one does not need to log in to; to interoperate better with some faulty WWW browsers that misuse CWD as a type testing mechanism; and to log things more clearly in order to diagnose such faults from server logs. HOST support means that ftpd supports virtual hosting on FTP, which is explained in the manual, although it is hard to find any FTP client that employs this.

* http://jdebp.eu./FGA/web-browser-ftp-hall-of-shame.html
* http://jdebp.info./FGA/web-browser-ftp-hall-of-shame.html

A further minor addition is a host command, a subset of the host commands from ISC and from KnotDNS that uses the same DNS client library from djbdns as all of the other djbdns query tools do. Of course, the conventional djbdns client tools have a simpler syntax and more regular behaviours than the host command, and are preferable. Moreover, the subset excludes rarities that djbdns has never supported, such as non-IN class queries.

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