Infobox Software
name = djbdns

caption =
developer = Daniel J. Bernstein
latest release version = 1.05
latest release date = February 11, 2001
latest preview version =
latest preview date =
operating system = Unix-like
platform =
genre = DNS server
license = Public domain
website =
The djbdns software package is a simple and security-aware DNS implementation created by Daniel J. Bernstein due to his frustrations with repeated BIND security holes. There is an as-yet-unclaimed $1000 prize [cite web
title=The djbdns security guarantee
] for the first person to find a privilege escalation security hole in djbdns.

As of 2004, it was the second most popular DNS server. [cite web | last = Moore | first = Don | year = 2004 | url = | title = DNS server survey | accessdate = 2005-01-06 ]

djbdns has never been vulnerable to the cache-poisoning vulnerability reported in July 2008. [cite web
url =
title = Multiple DNS implementations vulnerable to cache poisoning
accessdate = 2008-08-05
] [cite web
url =
title = An Astonishing Collaboration
accessdate = 2008-08-05

The components of djbdns

* dnscache -- the dns resolver and cache.
* tinydns -- a database-driven dns server.
* walldns -- a "reverse DNS wall", providing IP to domain name lookup only.
* rbldns -- a server designed for dns blacklisting service.
* pickdns -- a database-driven server that chooses from matching records depending on the requester's location. (This feature is now a standard part of tinydns.)
* axfrdns -- a zone-transfer server.

Client tools:
* axfr-get -- a zone-transfer client.
* dnsip -- simple address from name lookup.
* dnsipq -- address from name lookup with rewriting rules.
* dnsname -- simple name from address lookup.
* dnstxt -- simple text record from name lookup.
* dnsmx -- mail exchanger lookup.
* dnsfilter -- looks up names for addresses read from stdin, in parallel.
* dnsqr -- recursive general record lookup.
* dnsq -- non-recursive general record lookup, useful for debugging.
* dnstrace (and dnstracesort) -- comprehensive testing of the chains of authority over dns servers and their names.

...and several associated configuration tools.

In djbdns, different features and services, such as AXFR zone transfers, are split off into separate programs. Zone file parsing, DNS caching, and recursive resolving are also implemented as separate programs. The result of these design decisions is a dramatic reduction in code size and complexity of the daemon program that answers lookup requests. Daniel J. Bernstein (and many others) feel that this is true to the spirit of the Unix operating system, and makes security verification much simpler.

Copyright status

On December 28, 2007, Bernstein released djbdns into the public domain. [cite web
url =
title = Frequently asked questions from distributors
accessdate = 2007-12-31
] Formerly, the package was distributed as license-free software, which created challenges for inclusion in some Linux distributions.

See also

* Comparison of DNS server software


External links

* [ djbdns official homepage]
* [ A guide to djbdns]
* [ The djbdns section of FAQTS]
* [ Unofficial website]
* [ A djbdns guide and tutorial with addon]
*cite web|url=|title=Some of what is said about djbdns is wrong.|author=Jonathan de Boyne Pollard|work=Frequently Given Answers — Jonathan de Boyne Pollard's debunking of several myths relating to djbdns
*cite web|url=|title=The known problems with Dan Bernstein's djbdns|author=Jonathan de Boyne Pollard|work=Frequently Given Answers — Jonathan de Boyne Pollard's list of the several known problems in djbdns
* [ Supporting newer record formats through generic records.]
* [ LWN (Linux weekly news) looks at djbdns]

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