- adns
-
- Advanced, easy to use, asynchronous-capable DNS client library.
+ GNU adns
+
+ Advanced, easy to use, asynchronous-capable DNS client library and
+ utilities.
+
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:
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 affecting ease-of-use.
+ 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.
* 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, change its caching behaviour,
- use a different flow of control model, etc.
+ 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.
-
+
+ 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 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.
+
Forthcoming:
+
+ A native Perl interface is in the works, thanks to Tony Finch.
I hope that future versions may also have the following features:
- * The library can be used by threads in a multithreaded program in a
- natural way. It will multiplex many threads' queries through a
- single query socket.
- * Limited caching behaviour.
+ * 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 [3]commented adns.h
+ header file.
+
+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 beta 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), or via [9]cvsweb.
+
+ adns is also available from the [10]GNU Project FTP servers and their
+ [11]mirrors.
+
+Copyright and licensing
+
+ adns is Copyright 1997-1999 Ian Jackson and Copyright 1999 Tony Finch.
+
+ 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
+ [12]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 [13]Free Software Foundation, 59 Temple Place - Suite 330, Boston,
+ MA 02111-1307, USA, or email adns-maint@chiark.greenend.org.uk.
+ _________________________________________________________________
+
+ [14]Ian Jackson / [15]adns-maint@chiark.greenend.org.uk; more [16]free
+ software by me.
+
+ [17]GNU home page; [18]chiark home page; [19]site or mirror home page
+
+ This web page is Copyright (C)1996-1999 Ian Jackson. See the
+ [20]Copyright/acknowledgements.
+
+ Use any browser - [21]Campaign for a non-browser-specific WWW
+
+References
- (Technical note: adns requires a real nameserver like BIND 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.)
+ 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.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.txt
+ 8. ftp://ftp.chiark.greenend.org.uk/users/ian/adns/
+ 9. http://www.chiark.greenend.org.uk/ucgi/~ijackson/cvsweb/adns/
+ 10. http://www.gnu.org/
+ 11. http://www.gnu.org/order/ftp.html
+ 12. http://www.chiark.greenend.org.uk/~ian/COPYING.txt
+ 13. http://www.fsf.org/
+ 14. http://www.chiark.greenend.org.uk/
+ 15. mailto:adns-maint@chiark.greenend.org.uk
+ 16. http://www.chiark.greenend.org.uk/~ian/software/
+ 17. http://www.gnu.org/
+ 18. http://www.chiark.greenend.org.uk/
+ 19. http://www.chiark.greenend.org.uk/
+ 20. http://www.chiark.greenend.org.uk/~ian/sw-www-copy.html
+ 21. http://www.anybrowser.org/campaign/
~ianmdlvl / adns.git / blobdiff