nss-mdns-0.10/README - nest-learning-thermostat/5.0.2/nss-mdns - Git at Google


                                  nss-mdns 0.10

    Copyright 2004-2007 Lennart Poettering <mzaffzqaf (at) 0pointer (dot)
    de>
      * [1]License
      * [2]News
      * [3]Overview
      * [4]Current Status
      * [5]Documentation
      * [6]Requirements
      * [7]Installation
      * [8]Acknowledgements
      * [9]Download

 License

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser 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 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 GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 News

    Sat May 12 2007:

    [10]Version 0.10 released. Changes include: Ported to FreeBSD;
    alignment fixes for SPARC.

    Mon Jan 1 2007:

    [11]Version 0.9 released. Changes include: Make most shared library
    symbols private to not conflict with any symbols of the program we're
    loaded into. Fix a potential endless loop in the mDNS packet parsing
    code.

    Please note that due to security reasons from this release on the
    minimal mDNS stack included in nss-mdns (dubbed "legacy") is no longer
    built by default. Thus, nss-mdns will not work unless [12]Avahi is
    running! That makes Avahi essentially a hard dependency of nss-mdns.
    Pass --enable-legacy to reenable the mini mDNS stack again. Please
    note as well that this release does not honour /etc/resolv.conf domain
    search lists by default anymore. It created a lot of problems and was
    never recommended anyway. You may reenable this functionality by
    passing --enable-search-domains.

    Sat Apr 29 2006:

    [13]Version 0.8 released. Changes include: Build time option to
    disable "legacy unicast" mDNS requests, i.e. resolve exclusively with
    Avahi; build a special _minimal flavour of the shared objects to
    minimize unnecessary name lookup timeouts; fix IPv6 resolving when
    using Avahi.

    Please note that starting with nss-mdns 0.8 we encourage you to use a
    different /etc/nsswitch.conf configuration line. See below for more
    information!

    Sat Nov 19 2005:

    [14]Version 0.7 released. Changes include: Portability patch for ARM
    from Philipp Zabel; make sure not to print any messages to STDERR;
    deal with OOM situations properly; if multiple addresses are assigned
    to the same interface make sure to send a query packet only once;
    other cleanups

    Sun Aug 21 2005:

    [15]Version 0.6 released. Changes include: honour search list in
    /etc/resolv.conf; try to contact [16]Avahi for resolving.

    Sat Jun 4 2005:

    [17]Version 0.5 released. Changes include: only lookup hostnames
    ending in .local; add support for a configuration file
    (/etc/mdns.allow) to allow lookups for other names.

    Sun May 15 2005:

    [18]Version 0.4 released. Changes include: small portability fix for
    big endian architectures; send "legacy unicast" packets instead of
    normal mDNS packets (this should reduce traffic and improve response
    time)

    Jan Sun 16 2005:

    [19]Version 0.3 released. Changes include: add Debianization; use
    ip6.arpa instead of ip6.int for reverse IPv6 lookups.

    Fri Dec 17 2004:

    [20]Version 0.2 released. Changes include: send mDNS queries on every
    interface that supports multicasts, instead of only the one with the
    default route, making nss-mdns more robust on multi-homed hosts; gcc
    2.95 compatiblity.

    Mon Dec 6 2004:

    [21]Version 0.1 released

 Overview

    nss-mdns is a plugin for the GNU Name Service Switch (NSS)
    functionality of the GNU C Library (glibc) providing host name
    resolution via [22]Multicast DNS (aka Zeroconf, aka Apple Rendezvous,
    aka Apple Bonjour), effectively allowing name resolution by common
    Unix/Linux programs in the ad-hoc mDNS domain .local.

    nss-mdns provides client functionality only, which means that you have
    to run a mDNS responder daemon seperately from nss-mdns if you want to
    register the local host name via mDNS. I recommend [23]Avahi.

    nss-mdns is very lightweight (9 KByte stripped binary .so compiled
    with -DNDEBUG=1 -Os on i386, gcc 4.0), has no dependencies besides the
    glibc and requires only minimal configuration.

    By default nss-mdns tries to contact a running [24]avahi-daemon for
    resolving host names and addresses and making use of its superior
    record cacheing. Optionally nss-mdns can be compiled with a mini mDNS
    stack that can be used to resolve host names without a local Avahi
    installation. Both Avahi support and this mini mDNS stack are
    optional, however at least one of them needs to be enabled. If both
    are enabled a connection to Avahi is tried first, and if that fails
    the mini mDNS stack is used.

 Current Status

    It works!

    If the mini MDNS stack is used, nss-mdns supports resolving IPv6
    addresses but does so via IPv4 multicasts only. If Avahi is used for
    resolving IPv6 is supported properly.

 Documentation

    After compiling and installing nss-mdns you'll find six new NSS
    modules in /lib:
      * libnss_mdns.so.2
      * libnss_mdns4.so.2
      * libnss_mdns6.so.2
      * libnss_mdns_minimal.so.2
      * libnss_mdns4_minimal.so.2
      * libnss_mdns6_minimal.so.2

    libnss_mdns.so.2 resolves both IPv6 and IPv4 addresses,
    libnss_mdns4.so.2 only IPv4 addresses and libnss_mdns6.so.2 only IPv6
    addresses. Due to the fact that most mDNS responders only register
    local IPv4 addresses via mDNS, most people will want to use
    libnss_mdns4.so.2 exclusively. Using libnss_mdns.so.2 or
    libnss_mdns6.so.2 in such a situation causes long timeouts when
    resolving hosts since most modern Unix/Linux applications check for
    IPv6 addresses first, followed by a lookup for IPv4.

    libnss_mdns{4,6,}_minimal.so (new in version 0.8) is mostly identical
    to the versions without _minimal. However, they differ in one way. The
    minimal versions will always deny to resolve host names that don't end
    in .local or addresses that aren't in the range 169.254.x.x (the range
    used by [25]IPV4LL/APIPA/RFC3927.) Combining the _minimal and the
    normal NSS modules allows us to make mDNS authoritative for Zeroconf
    host names and addresses (and thus creating no extra burden on DNS
    servers with always failing requests) and use it as fallback for
    everything else.

    To activate one of the NSS modules you have to edit /etc/nsswitch.conf
    and add mdns4 and mdns4_minimal (resp. mdns, mdns6) to the line
    starting with "hosts:". On Debian this looks like this:
 # /etc/nsswitch.conf

 passwd:         compat
 group:          compat
 shadow:         compat

 hosts:          files mdns4_minimal [NOTFOUND=return] dns mdns4
 networks:       files

 protocols:      db files
 services:       db files
 ethers:         db files
 rpc:            db files

 netgroup:       nis

    That's it. You should now be able to resolve hosts from the .local
    domain with all your applications. For a quick check use glibc's
    getent tool:
 $ getent hosts foo.local
 192.168.50.4    foo.local

    Replace foo whith a host name that has been registered with an mDNS
    responder. (Don't try to use the tools host or nslookup for these
    tests! They bypass the NSS and thus nss-mdns and issue their DNS
    queries directly.)

    If you run a firewall, don't forget to allow UDP traffic to the the
    mDNS multicast address 224.0.0.251 on port 5353.

    Please note: The line above makes nss-mdns authoritative for the
    .local domain. If you have a unicast DNS domain with the same name you
    will no longer be able to resolve hosts from it. mDNS and a unicast
    DNS domain named .local are inherently incompatible. Please contact
    your local admistrator and ask him to move to a different domain name
    since .local is to be used exclusively for Zeroconf technology.
    [26]Further information.

    Starting with version 0.5, nss-mdns has a simple configuration file
    /etc/mdns.allow for enabling name lookups via mDNS in other domains
    than .local. The file contains valid domain suffixes, seperated by
    newlines. Empty lines are ignored as are comments starting with #. To
    enable mDNS lookups of all names, regardless of the domain suffix add
    a line consisting of * only (similar to nss-mdns mode of operation of
    versions <= 0.4):
 # /etc/mdns.allow
 *

    If the configuration file is absent or unreadable nss-mdns behaves as
    if a configuration file with the following contents is read:
 # /etc/mdns.allow
 .local.
 .local

    i.e. only hostnames ending with .local are resolved via mDNS.

    If the configuration file is existent but empty, mDNS name lookups are
    disabled completely. Please note that usually mDNS is not used for
    anything but .local, hence you usually don't want to touch this file.

 Requirements

    Currently, nss-mdns is tested on Linux only. A fairly modern glibc
    installation with development headers (2.0 or newer) is required. Not
    suprisingly nss-mdns requires a kernel compiled with IPv4 multicasting
    support enabled. [27]Avahi is recommended for its superior cacheing
    capabilities and for security reasons. Unless you compile nss-mdns
    with --enable-legacy Avahi is a hard dependency when nss-mdns is used,
    however not a build-time requirement.

    nss-mdns was developed and tested on Debian GNU/Linux "testing" from
    December 2004, it should work on most other Linux distributions (and
    maybe Unix versions) since it uses GNU autoconf and GNU libtool for
    source code configuration and shared library management.

 Installation

    As this package is made with the GNU autotools you should run
    ./configure inside the distribution directory for configuring the
    source tree. After that you should run make for compilation and make
    install (as root) for installation of nss-mdns.

 Acknowledgements

    SHIROYAMA Takayuki, Anand Kumria and Bastien Nocera, Sjoerd Simons for
    patches.

    Sean Meiners for search list support.

    Philipp Zabel for ARM support.

    Bruce M Simpson for porting it to FreeBSD.

 Download

    The newest release is always available from
    [28]http://0pointer.de/lennart/projects/nss-mdns/

    The current release is [29]0.10

    Get nss-mdns's development sources from the [30]Subversion
    [31]repository ([32]viewcvs):
 svn checkout svn://svn.0pointer.de/nss-mdns/trunk nss-mdns

    You may find an up to date Debian package of nss-mdns on the
    [33]Debian package repository. Many other distributions ship it, too.

    If you want to be notified whenever I release a new version of this
    software use the subscription feature of [34]Freshmeat.
      _________________________________________________________________


     Lennart Poettering <mzaffzqaf (at) 0pointer (dot) de>, May 2007

    $Id: README.html.in 116 2007-05-12 14:54:24Z lennart $

 References

    1. README#license
    2. README#news
    3. README#overview
    4. README#status
    5. README#documentation
    6. README#requirements
    7. README#installation
    8. README#acks
    9. README#download
   10. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.10.tar.gz
   11. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.9.tar.gz
   12. http://avahi.org/
   13. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.8.tar.gz
   14. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.7.tar.gz
   15. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.6.tar.gz
   16. http://avahi.org/
   17. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.5.tar.gz
   18. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.4.tar.gz
   19. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.3.tar.gz
   20. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.2.tar.gz
   21. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.1.tar.gz
   22. http://www.multicastdns.org/
   23. http://avahi.org/
   24. http://avahi.org/
   25. http://files.zeroconf.org/rfc3927.txt
   26. http://avahi.org/wiki/AvahiAndUnicastDotLocal
   27. http://avahi.org/
   28. http://0pointer.de/lennart/projects/nss-mdns/
   29. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.10.tar.gz
   30. http://subversion.tigris.org/
   31. svn://svn.0pointer.de/nss-mdns
   32. http://0pointer.de/cgi-bin/viewcvs.cgi/?root=nss-mdns
   33. http://packages.debian.org/libnss-mdns
   34. http://freshmeat.net/projects/nss-mdns/

	nss-mdns 0.10

	Copyright 2004-2007 Lennart Poettering <mzaffzqaf (at) 0pointer (dot)
	de>
	* [1]License
	* [2]News
	* [3]Overview
	* [4]Current Status
	* [5]Documentation
	* [6]Requirements
	* [7]Installation
	* [8]Acknowledgements
	* [9]Download

	License

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU Lesser 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 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 GNU
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public
	License along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

	News

	Sat May 12 2007:

	[10]Version 0.10 released. Changes include: Ported to FreeBSD;
	alignment fixes for SPARC.

	Mon Jan 1 2007:

	[11]Version 0.9 released. Changes include: Make most shared library
	symbols private to not conflict with any symbols of the program we're
	loaded into. Fix a potential endless loop in the mDNS packet parsing
	code.

	Please note that due to security reasons from this release on the
	minimal mDNS stack included in nss-mdns (dubbed "legacy") is no longer
	built by default. Thus, nss-mdns will not work unless [12]Avahi is
	running! That makes Avahi essentially a hard dependency of nss-mdns.
	Pass --enable-legacy to reenable the mini mDNS stack again. Please
	note as well that this release does not honour /etc/resolv.conf domain
	search lists by default anymore. It created a lot of problems and was
	never recommended anyway. You may reenable this functionality by
	passing --enable-search-domains.

	Sat Apr 29 2006:

	[13]Version 0.8 released. Changes include: Build time option to
	disable "legacy unicast" mDNS requests, i.e. resolve exclusively with
	Avahi; build a special _minimal flavour of the shared objects to
	minimize unnecessary name lookup timeouts; fix IPv6 resolving when
	using Avahi.

	Please note that starting with nss-mdns 0.8 we encourage you to use a
	different /etc/nsswitch.conf configuration line. See below for more
	information!

	Sat Nov 19 2005:

	[14]Version 0.7 released. Changes include: Portability patch for ARM
	from Philipp Zabel; make sure not to print any messages to STDERR;
	deal with OOM situations properly; if multiple addresses are assigned
	to the same interface make sure to send a query packet only once;
	other cleanups

	Sun Aug 21 2005:

	[15]Version 0.6 released. Changes include: honour search list in
	/etc/resolv.conf; try to contact [16]Avahi for resolving.

	Sat Jun 4 2005:

	[17]Version 0.5 released. Changes include: only lookup hostnames
	ending in .local; add support for a configuration file
	(/etc/mdns.allow) to allow lookups for other names.

	Sun May 15 2005:

	[18]Version 0.4 released. Changes include: small portability fix for
	big endian architectures; send "legacy unicast" packets instead of
	normal mDNS packets (this should reduce traffic and improve response
	time)

	Jan Sun 16 2005:

	[19]Version 0.3 released. Changes include: add Debianization; use
	ip6.arpa instead of ip6.int for reverse IPv6 lookups.

	Fri Dec 17 2004:

	[20]Version 0.2 released. Changes include: send mDNS queries on every
	interface that supports multicasts, instead of only the one with the
	default route, making nss-mdns more robust on multi-homed hosts; gcc
	2.95 compatiblity.

	Mon Dec 6 2004:

	[21]Version 0.1 released

	Overview

	nss-mdns is a plugin for the GNU Name Service Switch (NSS)
	functionality of the GNU C Library (glibc) providing host name
	resolution via [22]Multicast DNS (aka Zeroconf, aka Apple Rendezvous,
	aka Apple Bonjour), effectively allowing name resolution by common
	Unix/Linux programs in the ad-hoc mDNS domain .local.

	nss-mdns provides client functionality only, which means that you have
	to run a mDNS responder daemon seperately from nss-mdns if you want to
	register the local host name via mDNS. I recommend [23]Avahi.

	nss-mdns is very lightweight (9 KByte stripped binary .so compiled
	with -DNDEBUG=1 -Os on i386, gcc 4.0), has no dependencies besides the
	glibc and requires only minimal configuration.

	By default nss-mdns tries to contact a running [24]avahi-daemon for
	resolving host names and addresses and making use of its superior
	record cacheing. Optionally nss-mdns can be compiled with a mini mDNS
	stack that can be used to resolve host names without a local Avahi
	installation. Both Avahi support and this mini mDNS stack are
	optional, however at least one of them needs to be enabled. If both
	are enabled a connection to Avahi is tried first, and if that fails
	the mini mDNS stack is used.

	Current Status

	It works!

	If the mini MDNS stack is used, nss-mdns supports resolving IPv6
	addresses but does so via IPv4 multicasts only. If Avahi is used for
	resolving IPv6 is supported properly.

	Documentation

	After compiling and installing nss-mdns you'll find six new NSS
	modules in /lib:
	* libnss_mdns.so.2
	* libnss_mdns4.so.2
	* libnss_mdns6.so.2
	* libnss_mdns_minimal.so.2
	* libnss_mdns4_minimal.so.2
	* libnss_mdns6_minimal.so.2

	libnss_mdns.so.2 resolves both IPv6 and IPv4 addresses,
	libnss_mdns4.so.2 only IPv4 addresses and libnss_mdns6.so.2 only IPv6
	addresses. Due to the fact that most mDNS responders only register
	local IPv4 addresses via mDNS, most people will want to use
	libnss_mdns4.so.2 exclusively. Using libnss_mdns.so.2 or
	libnss_mdns6.so.2 in such a situation causes long timeouts when
	resolving hosts since most modern Unix/Linux applications check for
	IPv6 addresses first, followed by a lookup for IPv4.

	libnss_mdns{4,6,}_minimal.so (new in version 0.8) is mostly identical
	to the versions without _minimal. However, they differ in one way. The
	minimal versions will always deny to resolve host names that don't end
	in .local or addresses that aren't in the range 169.254.x.x (the range
	used by [25]IPV4LL/APIPA/RFC3927.) Combining the _minimal and the
	normal NSS modules allows us to make mDNS authoritative for Zeroconf
	host names and addresses (and thus creating no extra burden on DNS
	servers with always failing requests) and use it as fallback for
	everything else.

	To activate one of the NSS modules you have to edit /etc/nsswitch.conf
	and add mdns4 and mdns4_minimal (resp. mdns, mdns6) to the line
	starting with "hosts:". On Debian this looks like this:
	# /etc/nsswitch.conf

	passwd: compat
	group: compat
	shadow: compat

	hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
	networks: files

	protocols: db files
	services: db files
	ethers: db files
	rpc: db files

	netgroup: nis

	That's it. You should now be able to resolve hosts from the .local
	domain with all your applications. For a quick check use glibc's
	getent tool:
	$ getent hosts foo.local
	192.168.50.4 foo.local

	Replace foo whith a host name that has been registered with an mDNS
	responder. (Don't try to use the tools host or nslookup for these
	tests! They bypass the NSS and thus nss-mdns and issue their DNS
	queries directly.)

	If you run a firewall, don't forget to allow UDP traffic to the the
	mDNS multicast address 224.0.0.251 on port 5353.

	Please note: The line above makes nss-mdns authoritative for the
	.local domain. If you have a unicast DNS domain with the same name you
	will no longer be able to resolve hosts from it. mDNS and a unicast
	DNS domain named .local are inherently incompatible. Please contact
	your local admistrator and ask him to move to a different domain name
	since .local is to be used exclusively for Zeroconf technology.
	[26]Further information.

	Starting with version 0.5, nss-mdns has a simple configuration file
	/etc/mdns.allow for enabling name lookups via mDNS in other domains
	than .local. The file contains valid domain suffixes, seperated by
	newlines. Empty lines are ignored as are comments starting with #. To
	enable mDNS lookups of all names, regardless of the domain suffix add
	a line consisting of * only (similar to nss-mdns mode of operation of
	versions <= 0.4):
	# /etc/mdns.allow
	*

	If the configuration file is absent or unreadable nss-mdns behaves as
	if a configuration file with the following contents is read:
	# /etc/mdns.allow
	.local.
	.local

	i.e. only hostnames ending with .local are resolved via mDNS.

	If the configuration file is existent but empty, mDNS name lookups are
	disabled completely. Please note that usually mDNS is not used for
	anything but .local, hence you usually don't want to touch this file.

	Requirements

	Currently, nss-mdns is tested on Linux only. A fairly modern glibc
	installation with development headers (2.0 or newer) is required. Not
	suprisingly nss-mdns requires a kernel compiled with IPv4 multicasting
	support enabled. [27]Avahi is recommended for its superior cacheing
	capabilities and for security reasons. Unless you compile nss-mdns
	with --enable-legacy Avahi is a hard dependency when nss-mdns is used,
	however not a build-time requirement.

	nss-mdns was developed and tested on Debian GNU/Linux "testing" from
	December 2004, it should work on most other Linux distributions (and
	maybe Unix versions) since it uses GNU autoconf and GNU libtool for
	source code configuration and shared library management.

	Installation

	As this package is made with the GNU autotools you should run
	./configure inside the distribution directory for configuring the
	source tree. After that you should run make for compilation and make
	install (as root) for installation of nss-mdns.

	Acknowledgements

	SHIROYAMA Takayuki, Anand Kumria and Bastien Nocera, Sjoerd Simons for
	patches.

	Sean Meiners for search list support.

	Philipp Zabel for ARM support.

	Bruce M Simpson for porting it to FreeBSD.

	Download

	The newest release is always available from
	[28]http://0pointer.de/lennart/projects/nss-mdns/

	The current release is [29]0.10

	Get nss-mdns's development sources from the [30]Subversion
	[31]repository ([32]viewcvs):
	svn checkout svn://svn.0pointer.de/nss-mdns/trunk nss-mdns

	You may find an up to date Debian package of nss-mdns on the
	[33]Debian package repository. Many other distributions ship it, too.

	If you want to be notified whenever I release a new version of this
	software use the subscription feature of [34]Freshmeat.
	_________________________________________________________________


	Lennart Poettering <mzaffzqaf (at) 0pointer (dot) de>, May 2007

	$Id: README.html.in 116 2007-05-12 14:54:24Z lennart $

	References

	1. README#license
	2. README#news
	3. README#overview
	4. README#status
	5. README#documentation
	6. README#requirements
	7. README#installation
	8. README#acks
	9. README#download
	10. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.10.tar.gz
	11. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.9.tar.gz
	12. http://avahi.org/
	13. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.8.tar.gz
	14. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.7.tar.gz
	15. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.6.tar.gz
	16. http://avahi.org/
	17. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.5.tar.gz
	18. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.4.tar.gz
	19. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.3.tar.gz
	20. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.2.tar.gz
	21. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.1.tar.gz
	22. http://www.multicastdns.org/
	23. http://avahi.org/
	24. http://avahi.org/
	25. http://files.zeroconf.org/rfc3927.txt
	26. http://avahi.org/wiki/AvahiAndUnicastDotLocal
	27. http://avahi.org/
	28. http://0pointer.de/lennart/projects/nss-mdns/
	29. http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-0.10.tar.gz
	30. http://subversion.tigris.org/
	31. svn://svn.0pointer.de/nss-mdns
	32. http://0pointer.de/cgi-bin/viewcvs.cgi/?root=nss-mdns
	33. http://packages.debian.org/libnss-mdns
	34. http://freshmeat.net/projects/nss-mdns/