From: Charles Mills <cmills@...>
Date: 2004-10-09T11:33:57+09:00
Subject: Re: [ANN] DNS Service Discovery (aka Rendezvous) bindings for Ruby

On Oct 8, 2004, at 4:01 PM, Mikael Brockman wrote:
> I don't understand how to install it on Linux.  setup.rb is looking for
> -lmdns, but I can't find any shared libraries in the mDNSResponder 
> tree.
>

Building on a mac is easy :)
Figuring out how to build on linux was a pain :(

But it isn't that bad.  It looks like they renamed libmdns to libdns_sd.
So, make this change in extconf.rb:
## replace ##
   have_library( "mdns", "DNSServiceRefSockFD" ) or
     abort( "can't find rendezvous library" )
## with ##
   have_library( "mdns", "DNSServiceRefSockFD" ) or
   have_library( "dns_sd", "DNSServiceRefSockFD" ) or
     abort( "can't find rendezvous library" )
########
then:
$ ruby extconf.rb
checking for DNSServiceRefSockFD() in -lmdns... no
checking for DNSServiceRefSockFD() in -ldns_sd... yes
checking for dns_sd.h... yes
checking for htons()... yes
checking for ntohs()... yes
checking for if_indextoname()... yes
checking for if_nametoindex()... yes
creating Makefile
$ make
<snip>
$ /etc/init.d/mdns start  # if you don't have it started already
Starting Apple Darwin Multicast DNS / DNS Service Discovery daemon: 
mdnsd.
$ cd ../test
$ ruby test_resolve_ichat.rb
Press <return> to start (and <return to end):
############ HIT ENTER ###########
######## OPEN ICHAT on my MAC ####
Browsing: #<DNSSD::BrowseReply boson@rodin._presence._tcp.local. 
interface:eth0>
Adding: #<DNSSD::ResolveReply boson@rodin._presence._tcp.local. 
interface:eth0 target:rodin.local.:5298 {"status"=>"avail", "vc"=>"A!", 
"last"=>"Mills", "txtvers"=>"1", "AIM"=>"charlesmmills", 
"version"=>"1", "phsh"=>"41e70d70b1b37798ff87f753a05ba8025355b4a4", 
"1st"=>"Charles", "port.p2pj"=>"5298", "email"=>"hidden from spam"}>
####### QUIT ICHAT ###############
Browsing: #<DNSSD::BrowseReply boson@rodin._presence._tcp.local. 
interface:eth0>
Removing: #<DNSSD::ResolveReply boson@rodin._presence._tcp.local. 
interface:eth0 target:rodin.local.:5298 {"status"=>"avail", "vc"=>"A!", 
"last"=>"Mills", "txtvers"=>"1", "AIM"=>"charlesmmills", 
"version"=>"1", "phsh"=>"41e70d70b1b37798ff87f753a05ba8025355b4a4", 
"1st"=>"Charles", "port.p2pj"=>"5298", "email"=>"hidden from spam"}>

############ HIT ENTER ###########
<#DNSSD::Service (stopped)>
$ echo "beautiful, it worked"
$

I am running gentoo linux on a PC if it matters.

If you still have problems try getting the latest version of 
mDNSResponder from CVS.  Instructions here:
http://developer.apple.com/darwin/tools/cvs/howto.html
There needs to be a better way to do this, it is really a pain to get, 
registration required, etc. :(

Other stuff I found out trying to get this to work:

Apples DNS DS libs:
http://developer.apple.com/darwin/projects/rendezvous/

Other DNS SD libs (that won't work with the Ruby bindings and may be 
packed for your linux distro):
http://jmdns.sourceforge.net/
http://www.porchdogsoft.com/products/howl/GettingStarted.html

-Charlie