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-
- GNU adns
-
- Advanced, easy to use, asynchronous-capable DNS client library.
-
- adns is a resolver library for C (and C++) programs. In contrast with
- the existing 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 sanity checks
- eg 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.
-
-Forthcoming:
-
- I hope that future versions may also have the following features:
- * The library should be useable by threads in a multithreaded
- program in a natural way. It should multiplex many threads'
- queries through a single query socket.
- * IPv6 support.
- * Some kind of awareness of DNSSEC.
- * Possibly some very limited caching behaviour.
-
- (Technical note: adns requires a real nameserver like [1]BIND or
- [2]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.)
-
-Documentation
-
- I'm afraid there is no manual yet. However, competent C programmers
- should be able to use the library based on the commented [3]adns.h
- header file (from version 0.4).
-
-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
- adns-bugreports@chiark.greenend.org.uk. If you'd prefer that your
- message wasn't forwarded to the adns-bugreports list, send it to
- adns-maint@chiark.greendend.org.uk.
-
-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, &c. The bug reports address mentioned
- above is also a mailing list; feel free to subscribe to it.
-
- There are [4]archives and subscription web pages, or you can subscribe
- by sending mail containing the word `subscribe' to
- adns-announce-REQUEST@chiark.greenend.org.uk or
- adns-discuss-REQUEST@chiark.greenend.org.uk.
-
-Download
-
- Available for download from [5]chiark.greenend.org.uk are:
- * The [6]current pre-release version as a gzipped tarfile.
- * [7]adns.h API header file with comments (currently there is no
- manual, sorry).
- * All versions released so far are also available via [8]anonymous
- FTP.
- * 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).
-
- adns is also available from the [9]GNU Project FTP servers and their
- [10]mirrors.
-
-Copyright and licensing
-
- adns is Copyright 1997-1999 Ian Jackson.
-
- 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
- [11]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 [12]Free Software Foundation, 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA, or email adns-maint@chiark.greenend.org.uk.
- _________________________________________________________________
-
- [13]Ian Jackson / [14]adns-maint@chiark.greenend.org.uk; more [15]free
- software by me.
-
- [16]GNU home page; [17]chiark home page; [18]site or mirror home page
-
- This web page is Copyright (C)1996-1999 Ian Jackson. See the
- [19]Copyright/acknowledgements.
-
- Use any browser - [20]Campaign for a non-browser-specific WWW
-
-References
-
- 1. http://www.isc.org/view.cgi?/products/BIND/index.phtml
- 2. http://www.dents.org/
- 3. http://www.chiark.greenend.org.uk/~ian/adns/adns.h.0.4.txt
- 4. http://www.chiark.greenend.org.uk/mailman/listinfo
- 5. http://www.chiark.greenend.org.uk/~ian/adns/
- 6. http://www.chiark.greenend.org.uk/~ian/adns/adns.tar.gz
- 7. http://www.chiark.greenend.org.uk/~ian/adns/adns.h.0.5.txt
- 8. ftp://ftp.chiark.greenend.org.uk/users/ian/adns/
- 9. http://www.gnu.org/
- 10. http://www.gnu.org/order/ftp.html
- 11. http://www.chiark.greenend.org.uk/~ian/COPYING.txt
- 12. http://www.fsf.org/
- 13. http://www.chiark.greenend.org.uk/
- 14. mailto:adns-maint@chiark.greenend.org.uk
- 15. http://www.chiark.greenend.org.uk/~ian/software/
- 16. http://www.gnu.org/
- 17. http://www.chiark.greenend.org.uk/
- 18. http://www.chiark.greenend.org.uk/
- 19. http://www.chiark.greenend.org.uk/~ian/sw-www-copy.html
- 20. http://www.anybrowser.org/campaign/