GNU adns

  Advanced, easy to use, asynchronous-capable DNS client library and
  utilities.

  adns is a resolver library for C (and C++) programs, and a collection
  of useful DNS resolver utilities.

C library

  In contrast with the standard interfaces, gethostbyname et al and
  libresolv, it has the following features:
    * It is reasonably easy to use for simple programs which just want
      to translate names to addresses, look up MX records, etc.
    * It can be used in an asynchronous, non-blocking, manner. Many
      queries can be handled simultaneously.
    * Responses are decoded automatically into a natural representation
      for a C program - there is no need to deal with DNS packet
      formats.
    * Sanity checking (eg, name syntax checking, reverse/forward
      correspondence, CNAME pointing to CNAME) is performed
      automatically.
    * Time-to-live, CNAME and other similar information is returned in
      an easy-to-use form, without getting in the way.
    * There is no global state in the library; resolver state is an
      opaque data structure which the client creates explicitly. A
      program can have several instances of the resolver.
    * Errors are reported to the application in a way that distinguishes
      the various causes of failure properly.
    * Understands conventional resolv.conf, but this can overridden by
      environment variables.
    * Flexibility. For example, the application can tell adns to: ignore
      environment variables (for setuid programs), disable hostname
      syntax sanity checks to return arbitrary data, override or ignore
      resolv.conf in favour of supplied configuration, etc.
    * Believed to be correct ! For example, will correctly back off to
      TCP in case of long replies or queries, or to other nameservers if
      several are available. It has sensible handling of bad responses
      etc.

DNS utility programs

  adns also comes with a number of utility programs for use from the
  command line and in scripts:
    * adnslogres is a much faster version of Apache's logresolv program.
    * adnsresfilter is a filter which copies its input to its output,
      replacing IP addresses by the corresponding names, without unduly
      delaying the output. For example, you can usefully pipe the output
      of netstat -n, tcpdump -ln, and the like, into it.
    * adnshost is a general-purpose DNS lookup utility which can be used
      easily in from the command line and from shell scripts to do
      simple lookups. In a more advanced mode it can be used as a
      general-purpose DNS helper program for scripting languages which
      can invoke and communicate with subprocesses. See the [1]adnshost
      usage message for a summary of its capabilities.

Documentation

  I'm afraid there is no manual yet. However, competent C programmers
  should be able to use the library based on the [2]commented adns.h
  header file, and the usage messages for the programs should be
  sufficient.

Feedback

  I'd be pleased if you would let me know if you're using my library in
  your project, and what you think of it.

  If you are subscribed to adns-discuss please send feedback, including
  bug reports, there; otherwise send mail to
  [email protected]. If you'd prefer that your
  message wasn't forwarded to the adns-bugreports list, send it to
  [email protected].

Mailinglists

  I have set up mailinglists adns-announce and adns-discuss. The
  announcements list is moderated and will contain only announcements of
  important bugs, new versions, etc. The bug reports address mentioned
  above is also a mailing list; feel free to subscribe to it.

  There are [3]archives and subscription web pages, or you can subscribe
  by sending mail containing the word `subscribe' to
  [email protected] or
  [email protected].

Download

  Available for download from [4]chiark.greenend.org.uk are:
    * The [5]current release as a gzipped tarfile.
    * [6]adns.h API header file with comments, and [7]usage message for
      adnshost (currently there is no manual, sorry).
    * All versions released so far are also available via [8]anonymous
      FTP and [9]HTTP,
    * A mirror of my CVS repository is available via rsync from
      rsync.chiark.greenend.org.uk::ftp/users/ian/cvs-pub/adns (use FTP
      first to find your way around), or via [10]cvsweb.

  adns is also available from the [11]GNU Project FTP servers and their
  [12]mirrors.

Technical note

  adns requires a real nameserver like [13]BIND or [14]Dents running on
  the same system or a nearby one, which must be willing to provide
  `recursive service'. I.e., adns is a `stub resolver'. All properly
  configured UN*X and GNU systems will already have such nameserver(s);
  they are usually listed in /etc/resolv.conf.

Copyright and licensing

  adns is Copyright 1997-2000 Ian Jackson, Copyright 1999-2000 Tony
  Finch, and Copyright (C) 1991 Massachusetts Institute of Technology.

  adns is free software; you can redistribute it and/or modify it under
  the terms of the GNU General Public License as published by the Free
  Software Foundation; either version 2 of the License, or (at your
  option) any later version.

  This program and documentation is distributed in the hope that it will
  be useful, but without any warranty; without even the implied warranty
  of merchantability or fitness for a particular purpose. See the
  [15]GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with adns, or one should be available above; if not, write to
  the [16]Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  MA 02111-1307, USA, or email [email protected].
    _________________________________________________________________

  [17]Ian Jackson / [18][email protected]; more [19]free
  software by me.

  [20]GNU home page; [21]chiark home page; [22]site or mirror home page

  This web page is Copyright (C)1996-2000 Ian Jackson. See the
  [23]Copyright/acknowledgements.

  Use any browser - [24]Campaign for a non-browser-specific WWW

References

  1. http://www.chiark.greenend.org.uk/~ian/adns/adnshost.txt
  2. http://www.chiark.greenend.org.uk/~ian/adns/adns.h.txt
  3. http://www.chiark.greenend.org.uk/mailman/listinfo
  4. http://www.chiark.greenend.org.uk/~ian/adns/
  5. http://www.chiark.greenend.org.uk/~ian/adns/adns.tar.gz
  6. http://www.chiark.greenend.org.uk/~ian/adns/adns.h.txt
  7. http://www.chiark.greenend.org.uk/~ian/adns/adnshost.txt
  8. ftp://ftp.chiark.greenend.org.uk/users/ian/adns/
  9. http://www.chiark.greenend.org.uk/~ian/adns/ftp/
 10. http://www.chiark.greenend.org.uk/ucgi/~ijackson/cvsweb/adns/
 11. http://www.gnu.org/
 12. http://www.gnu.org/order/ftp.html
 13. http://www.isc.org/view.cgi?/products/BIND/index.phtml
 14. http://www.dents.org/
 15. http://www.chiark.greenend.org.uk/~ian/COPYING.txt
 16. http://www.fsf.org/
 17. http://www.chiark.greenend.org.uk/
 18. mailto:[email protected]
 19. http://www.chiark.greenend.org.uk/~ian/software/
 20. http://www.gnu.org/
 21. http://www.chiark.greenend.org.uk/
 22. file://localhost/
 23. http://www.chiark.greenend.org.uk/~ian/sw-www-copy.html
 24. http://www.anybrowser.org/campaign/

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