diff options
Diffstat (limited to '')
| -rw-r--r-- | adns-0.6/README | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/adns-0.6/README b/adns-0.6/README new file mode 100644 index 0000000..43d0df2 --- /dev/null +++ b/adns-0.6/README @@ -0,0 +1,148 @@ + + 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/ |