Resolv.rb question

ruby-talk
1

I’m writing a script where it would be really good to be able to give
Resolv::DNS.new() an arbitrary list of DNS servers to use without having
to feed it a modified resolv.conf file. Is there a good way to do this?

I’d like to be able to do this:
r =
Resolv::DNS.new(nameservers=[‘127.0.0.1’,‘192.168.0.1’],search=[‘foo.com’])
a = r.getaddress($host)

Is there a good way to do this? The current Resolv::DNS seems to be
fixated on loading all it’s information from a resolv.conf or hosts file.

···

–
Daniel Hobe daniel@nightrunner.com
http://www.nightrunner.com

2

Daniel Hobe wrote:

I’m writing a script where it would be really good to be able to give
Resolv::DNS.new() an arbitrary list of DNS servers to use without having
to feed it a modified resolv.conf file. Is there a good way to do this?

I’d like to be able to do this:
r =
Resolv::DNS.new(nameservers=[‘127.0.0.1’,‘192.168.0.1’],search=[‘foo.com’])
a = r.getaddress($host)

Is there a good way to do this? The current Resolv::DNS seems to be
fixated on loading all it’s information from a resolv.conf or hosts file.

I solved my own question thusly:

#!/usr/bin/env ruby

require ‘resolv’
Thread.abort_on_exception = true

class Resolv::DNS2 < Resolv::DNS
def initialize(nameserver=[‘localhost’],search = nil,ndots=1)
@mutex = Mutex.new
@config = Config.new(nameserver,search,ndots)
@initialized = nil
end

class Config < Resolv::DNS::Config
def initialize(nameserver,search,ndots)
@mutex = Mutex.new
@nameserver = nameserver
@search = search
@ndots = ndots
@initialized = nil
end

 def lazy_initialize
   unless @search
     hostname = Socket.gethostname
     if /\./ =~ hostname
       @search = [Resolv::DNS::Label.split($')]
     else
       @search = [[]]
     end
   end
 end

end
end

d = Resolv::DNS2.new([‘216.220.40.243’,‘205.210.42.20’],
[[‘packetspike.net’],[‘nightrunner.com’]])
puts d.getaddress(‘www.packetspike.net’)

···

–
Daniel Hobe daniel@nightrunner.com
http://www.nightrunner.com