Class: Dnsruby::Resolver

### Home Classes Methods

### In Files

- lib/Dnsruby/Resolver.rb

### Parent

Object

### Namespace

- CLASS Dnsruby::Resolver::EventType

### Methods

- ::check_port
- ::get_ports_from
- ::get_tsig
- ::new
- ::port_in_range
- #add_src_port
- #close
- #dnssec=
- #do_caching=
- #ignore_truncation=
- #nameserver=
- #nameservers=
- #no_tcp=
- #packet_timeout=
- #persistent_tcp=
- #persistent_udp=
- #port=
- #query
- #recurse=
- #send_async
- #send_message
- #send_plain_message
- #set_config_nameserver
- #src_address6=
- #src_address=
- #src_port
- #src_port=
- #tsig=
- #udp_size=
- #update_internal_res
- #use_tcp=

### Files

- DNSSEC
- EVENTMACHINE
- EXAMPLES
- README

### Class/Module Index

Quicksearch

- Dnsruby
- Dnsruby::Algorithms
- Dnsruby::Classes
- Dnsruby::CodeMapper
- Dnsruby::Config
- Dnsruby::DNS
- Dnsruby::DecodeError
- Dnsruby::Dnssec
- Dnsruby::Dnssec::ValidationPolicy
- Dnsruby::EncodeError
- Dnsruby::ExtendedRCode
- Dnsruby::FormErr
- Dnsruby::Header
- Dnsruby::Hosts
- Dnsruby::IPv4
- Dnsruby::IPv6
- Dnsruby::Message
- Dnsruby::Message::Section
- Dnsruby::Message::SecurityLevel
- Dnsruby::MetaTypes
- Dnsruby::Modes
- Dnsruby::NXDomain
- Dnsruby::NXRRSet
- Dnsruby::Name
- Dnsruby::Name::Label
- Dnsruby::NotAuth
- Dnsruby::NotImp
- Dnsruby::NotZone
- Dnsruby::Nsec3HashAlgorithms
- Dnsruby::OpCode
- Dnsruby::OtherResolvError
- Dnsruby::QTypes
- Dnsruby::Question
- Dnsruby::RCode
- Dnsruby::RR
- Dnsruby::RR::ANY
- Dnsruby::RR::CERT
- Dnsruby::RR::CERT::CertificateTypes
- Dnsruby::RR::CNAME
- Dnsruby::RR::DHCID
- Dnsruby::RR::DLV
- Dnsruby::RR::DNAME
- Dnsruby::RR::DNSKEY
- Dnsruby::RR::DS
- Dnsruby::RR::DS::DigestTypes
- Dnsruby::RR::DomainName
- Dnsruby::RR::Generic
- Dnsruby::RR::HINFO
- Dnsruby::RR::HIP
- Dnsruby::RR::IN
- Dnsruby::RR::IN::A
- Dnsruby::RR::IN::AAAA
- Dnsruby::RR::IN::AFSDB
- Dnsruby::RR::IN::PX
- Dnsruby::RR::IN::SRV
- Dnsruby::RR::IN::WKS
- Dnsruby::RR::IPSECKEY
- Dnsruby::RR::ISDN
- Dnsruby::RR::KX
- Dnsruby::RR::LOC
- Dnsruby::RR::MB
- Dnsruby::RR::MG
- Dnsruby::RR::MINFO
- Dnsruby::RR::MR
- Dnsruby::RR::MX
- Dnsruby::RR::NAPTR
- Dnsruby::RR::NS
- Dnsruby::RR::NSAP
- Dnsruby::RR::NSEC
- Dnsruby::RR::NSEC3
- Dnsruby::RR::NSEC3PARAM
- Dnsruby::RR::OPT
- Dnsruby::RR::PTR
- Dnsruby::RR::RP
- Dnsruby::RR::RRSIG
- Dnsruby::RR::RT
- Dnsruby::RR::SOA
- Dnsruby::RR::SPF
- Dnsruby::RR::SSHFP
- Dnsruby::RR::SSHFP::Algorithms
- Dnsruby::RR::SSHFP::FpTypes
- Dnsruby::RR::TKEY
- Dnsruby::RR::TSIG
- Dnsruby::RR::TXT
- Dnsruby::RR::X25
- Dnsruby::RRSet
- Dnsruby::Recursor
- Dnsruby::Refused
- Dnsruby::Resolv
- Dnsruby::ResolvError
- Dnsruby::ResolvTimeout
- Dnsruby::Resolver
- Dnsruby::Resolver::EventType
- Dnsruby::SelectThread
- Dnsruby::ServFail
- Dnsruby::SingleResolver
- Dnsruby::TheLog
- Dnsruby::TsigError
- Dnsruby::TsigNotSignedResponseError
- Dnsruby::Types
- Dnsruby::Update
- Dnsruby::VerifyError
- Dnsruby::YXDomain
- Dnsruby::YXRRSet
- Dnsruby::ZoneReader
- Dnsruby::ZoneReader::ParseException
- Dnsruby::ZoneSerialError
- Dnsruby::ZoneTransfer
- Dnsruby::ZoneTransfer::Delta
- Base32

No matching classes.

# Dnsruby::Resolver

## Description

Dnsruby::Resolver is a DNS stub resolver. This class performs queries with retries across multiple nameservers. The system configured resolvers are used by default.

The retry policy is a combination of the Net::DNS and dnsjava approach, and has the option of :

- A total timeout for the query (defaults to 0, meaning "no total timeout")

- A retransmission system that targets the namervers concurrently once the first query round is complete, but in which the total time per query round is split between the number of nameservers targetted for the first round. and total time for query round is doubled for each query round

    Note that, if a total timeout is specified, then that will apply regardless of the retry policy

(i.e. it may cut retries short).

    Note also that these timeouts are distinct from the SingleResolver's packet_timeout

    Timeouts apply to the initial query and response. If DNSSEC validation is to
    be performed, then additional queries may be required (these are performed automatically
    by Dnsruby). Each additional query will be performed with its own timeouts.
    So, even with a query_timeout of 5 seconds, a response which required extensive
    validation may take several times that long.
    (Future versions of Dnsruby may expose finer-grained events for client tracking of
    responses and validation)

## Methods

### Synchronous

These methods raise an exception or return a response message with rcode==NOERROR

- Dnsruby::Resolver#send_message(msg)

- Dnsruby::Resolver#query(name [, type [, klass]])

### Asynchronous

These methods use a response queue to return the response and the error

- Dnsruby::Resolver#send_async(msg, response_queue, query_id)

## Event Loop

Dnsruby runs a pure Ruby event loop to handle I/O in a single thread. Support for EventMachine has been deprecated.

### Constants

AbsoluteMinDnssecUdpSize
DefaultDnssec
DefaultPacketTimeout
DefaultPort
DefaultQueryTimeout
DefaultRetryDelay
DefaultRetryTimes
DefaultUDPSize
MinDnssecUdpSize

### Attributes

config[R]

The current Config

dnssec[R]

Use DNSSEC for this Resolver

do_caching[RW]

Does this Resolver cache answers, and attempt to retrieve answer from the cache?

do_validation[RW]

Defines whether validation is performed by default on this Resolver when the query method is called. Note that send_message and send_async expect a Message object to be passed in, which is already configured to the callers requirements.

ignore_truncation[R]

Should truncation be ignored? i.e. the TC bit is ignored and thus the resolver will not requery over TCP if TC is set

no_tcp[R]

If no_tcp==true, then ONLY UDP will be used as a transport. This should not generally be used, but is provided as a debugging aid.

packet_timeout[R]

The timeout for any individual packet. This is the timeout used by SingleResolver

port[R]

The port to send queries to on the resolver

query_timeout[RW]

Note that this timeout represents the total time a query may run for - multiple packets can be sent to multiple nameservers in this time. This is distinct from the SingleResolver per-packet timeout The query_timeout is not required - it will default to 0, which means "do not use query_timeout". If this is the case then the timeout will be dictated by the retry_times and retry_delay attributes

recurse[R]

Should the Recursion Desired bit be set?

retry_delay[RW]

The query will be tried across nameservers retry_times times, with a delay of retry_delay seconds between each retry. The first time round, retry_delay will be divided by the number of nameservers being targetted, and a new nameserver will be queried with the resultant delay.

retry_times[RW]

The query will be tried across nameservers retry_times times, with a delay of retry_delay seconds between each retry. The first time round, retry_delay will be divided by the number of nameservers being targetted, and a new nameserver will be queried with the resultant delay.

src_address[R]

The source address to send queries from for IPv4

src_address6[R]

The source address to send queries from for IPv6

tsig[R]
udp_size[R]

The maximum UDP size to be used

use_tcp[R]

Should TCP be used as a transport rather than UDP? If use_tcp==true, then ONLY TCP will be used as a transport.

### Public Class Methods

check_port(p, src_port=[]) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 599
    def Resolver.check_port(p, src_port=[])
      if (p.class != Fixnum)
        tmp_src_ports = Array.new(src_port)
        p.each do |x|
          if (!Resolver.check_port(x, tmp_src_ports))
            return false
          end
          tmp_src_ports.push(x)
        end
        return true
      end
      if (Resolver.port_in_range(p))
        if ((p == 0) && (src_port.length > 0))
          return false
        end
        return true
      else
        Dnsruby.log.error("Illegal port (#{p})")
        raise ArgumentError.new("Illegal port #{p}")
      end
    end

get_ports_from(p) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 631
    def Resolver.get_ports_from(p)
      a = []
      if (p.class == Fixnum)
        a = [p]
      else
        p.each do |x|
          a.push(x)
        end
      end
      return a
    end

get_tsig(args) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 665
    def Resolver.get_tsig(args)
      tsig = nil
      if (args.length == 1)
        if (args[0])
          if (args[0].instance_of?RR::TSIG)
            tsig = args[0]
          elsif (args[0].instance_of?Array)
            if (args[0].length > 2)
              tsig = RR.new_from_hash({:type => Types.TSIG, :klass => Classes.ANY, :name => args[0][0], :key => args[0][1], :algorithm => args[0][2]})
            else
              tsig = RR.new_from_hash({:type => Types.TSIG, :klass => Classes.ANY, :name => args[0][0], :key => args[0][1]})
            end
          end
        else
          #          Dnsruby.log.debug{"TSIG signing switched off"}

          return nil
        end
      elsif (args.length ==2)
        tsig = RR.new_from_hash({:type => Types.TSIG, :klass => Classes.ANY, :name => args[0], :key => args[1]})
      elsif (args.length ==3)
        tsig = RR.new_from_hash({:type => Types.TSIG, :klass => Classes.ANY, :name => args[0], :key => args[1], :algorithm => args[2]})
      else
        raise ArgumentError.new("Wrong number of arguments to tsig=")
      end
      Dnsruby.log.info{"TSIG signing now using #{tsig.name}, key=#{tsig.key}"}
      return tsig
    end

new(*args) click to toggle source

Create a new Resolver object. If no parameters are passed in, then the default system configuration will be used. Otherwise, a Hash may be passed in with the following optional elements :

- :port

- :use_tcp

- :tsig

- :ignore_truncation

- :src_address

- :src_address6

- :src_port

- :recurse

- :udp_size

- :config_info - see Config

- :nameserver - can be either a String or an array of Strings

- :packet_timeout

- :query_timeout

- :retry_times

- :retry_delay

- :do_caching

    # File lib/Dnsruby/Resolver.rb, line 377
    def initialize(*args)
      # @TODO@ Should we allow :namesver to be an RRSet of NS records? Would then need to randomly order them?

      @resolver_ruby = nil
      @src_address = nil
      @src_address6 = nil
      @single_res_mutex = Mutex.new
      @configured = false
      @do_caching = true
      @config = Config.new()
      reset_attributes

      # Process args

      if (args.length==1)
        if (args[0].class == Hash)
          args[0].keys.each do |key|
            begin
              if (key == :config_info)
                @config.set_config_info(args[0][:config_info])
              elsif (key==:nameserver)
                set_config_nameserver(args[0][:nameserver])
              elsif (key==:nameservers)
                set_config_nameserver(args[0][:nameservers])
              else
                send(key.to_s+"=", args[0][key])
              end
            rescue Exception => e
              Dnsruby.log.error{"Argument #{key} not valid : #{e}\n"}
            end
          end
        elsif (args[0].class == String)
          set_config_nameserver(args[0])
        elsif (args[0].class == Config)
          # also accepts a Config object from Dnsruby::Resolv

          @config = args[0]
        end
      else
        # Anything to do?

      end
      #      if (@single_resolvers==[])

      #        add_config_nameservers

      #      end

      update
      #      ResolverRegister::register_resolver(self)

    end

port_in_range(p) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 621
    def Resolver.port_in_range(p)
      if ((p == 0) || ((p >= 50000) && (p <= 65535)))
        # @TODO@ IANA port bitmap - use 50000 - 65535 for now

        #            ((Iana::IANA_PORTS.index(p)) == nil &&

        #              (p > 1024) && (p < 65535)))

        return true
      end
      return false
    end

### Public Instance Methods

add_src_port(p) click to toggle source

Can be a single Fixnum or a Range or an Array If an invalid port is selected (one reserved by IANA), then an ArgumentError will be raised. "0" means "any valid port" - this is only a viable option if it is the only port in the list. An ArgumentError will be raised if "0" is added to an existing set of source ports.

    res.add_src_port(60000)
    res.add_src_port([60001,60005,60010])
    res.add_src_port(60015..60115)

    # File lib/Dnsruby/Resolver.rb, line 586
    def add_src_port(p)
      if (Resolver.check_port(p, @src_port))
        a = Resolver.get_ports_from(p)
        a.each do |x|
          if ((@src_port.length > 0) && (x == 0))
            raise ArgumentError.new("src_port of 0 only allowed as only src_port value (currently #{@src_port.length} values")
          end
          @src_port.push(x)
        end
      end
      update
    end

close() click to toggle source

Close the Resolver. Unfinished queries are terminated with OtherResolvError.

    # File lib/Dnsruby/Resolver.rb, line 352
    def close
      @resolver_ruby.close if @resolver_ruby
    end

dnssec=(d) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 734
    def dnssec=(d)
      @dnssec = d
      if (d)
        # Set the UDP size (RFC 4035 section 4.1)

        if (@udp_size < MinDnssecUdpSize)
          self.udp_size = MinDnssecUdpSize
        end
      end
      update
    end

do_caching=(on) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 724
    def do_caching=(on)
      @do_caching=on
      update
    end

ignore_truncation=(on) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 694
    def ignore_truncation=(on)
      @ignore_truncation = on
      update
    end

nameserver=(n) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 528
    def nameserver=(n)
      @configured = true
      @single_res_mutex.synchronize {
        @single_resolvers=[]
      }
      set_config_nameserver(n)
      add_config_nameservers
    end

nameservers=(ns) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 525
    def nameservers=(ns)
      self.nameserver=(ns)
    end

no_tcp=(on) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 648
    def no_tcp=(on)
      @no_tcp=on
      update
    end

packet_timeout=(t) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 542
    def packet_timeout=(t)
      @packet_timeout = t
      update
    end

persistent_tcp=(on) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 714
    def persistent_tcp=(on)
      @persistent_tcp = on
      update
    end

persistent_udp=(on) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 719
    def persistent_udp=(on)
      @persistent_udp = on
      update
    end

port=(a) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 709
    def port=(a)
      @port = a
      update
    end

query(name, type=Types.A, klass=Classes.IN, set_cd=@dnssec) click to toggle source

Query for a name. If a valid Message is received, then it is returned to the caller. Otherwise an exception (a Dnsruby::ResolvError or Dnsruby::ResolvTimeout) is raised.

    require 'Dnsruby'
    res = Dnsruby::Resolver.new
    response = res.query("example.com") # defaults to Types.A, Classes.IN
    response = res.query("example.com", Types.MX)
    response = res.query("208.77.188.166") # IPv4 address so PTR query will be made
    response = res.query("208.77.188.166", Types.PTR)

    # File lib/Dnsruby/Resolver.rb, line 173
    def query(name, type=Types.A, klass=Classes.IN, set_cd=@dnssec)
      msg = Message.new
      msg.do_caching = @do_caching
      msg.header.rd = 1
      msg.add_question(name, type, klass)
      msg.do_validation = @do_validation
      if (@dnssec)
        msg.header.cd = set_cd # We do our own validation by default

      end
      return send_message(msg)
    end

recurse=(a) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 729
    def recurse=(a)
      @recurse = a
      update
    end

send_async(*args) click to toggle source

Asynchronously send a Message to the server. The send can be done using just Dnsruby. Support for EventMachine has been deprecated.

## Dnsruby pure Ruby event loop :

A client_queue is supplied by the client, along with an optional client_query_id to identify the response. The client_query_id is generated, if not supplied, and returned to the client. When the response is known, a tuple of (query_id, response_message, exception) will be added to the client_queue.

The query is sent synchronously in the caller's thread. The select thread is then used to listen for and process the response (up to pushing it to the client_queue). The client thread is then used to retrieve the response and deal with it.

Takes :

- msg - the message to send

- client_queue - a Queue to push the response to, when it arrives

- client_query_id - an optional ID to identify the query to the client

- use_tcp - whether to use only TCP (defaults to SingleResolver.use_tcp)

Returns :

- client_query_id - to identify the query response to the client. This ID is

generated if it is not passed in by the client

### Example invocations :

    id = res.send_async(msg, queue)
    NOT SUPPORTED : id = res.send_async(msg, queue, use_tcp)
    id = res.send_async(msg, queue, id)
    id = res.send_async(msg, queue, id, use_tcp)

### Example code :

    require 'Dnsruby'
    res = Dnsruby::Resolver.newsend
    query_id = 10 # can be any object you like
    query_queue = Queue.new
    res.send_async(Message.new("example.com", Types.MX),  query_queue, query_id)
    query_id_2 = res.send_async(Message.new("example.com", Types.A), query_queue)
    # ...do a load of other stuff here...
    2.times do
      response_id, response, exception = query_queue.pop
      # You can check the ID to see which query has been answered
      if (exception == nil)
          # deal with good response
      else
          # deal with problem
      end
    end

    # File lib/Dnsruby/Resolver.rb, line 332
    def send_async(*args) # msg, client_queue, client_query_id)

      if (!@configured)
        add_config_nameservers
      end
      #      @single_res_mutex.synchronize {

      if (!@resolver_ruby) # @TODO@ Synchronize this?

        @resolver_ruby = ResolverRuby.new(self)
      end
      #      }

      client_query_id = @resolver_ruby.send_async(*args)
      if (@single_resolvers.length == 0)
        Thread.start {
          sleep(@query_timeout == 0 ? 1 : @query_timeout)
          args[1].push([client_query_id, nil, ResolvTimeout.new("Query timed out - no nameservers configured")])
        }
      end
      return client_query_id
    end

send_message(message) click to toggle source

Send a message, and wait for the response. If a valid Message is received, then it is returned to the caller. Otherwise an exception (a Dnsruby::ResolvError or Dnsruby::ResolvTimeout) is raised.

send_async is called internally.

example :

    require 'dnsruby'
    include Dnsruby
    res = Dnsruby::Resolver.new
    begin
    response = res.send_message(Message.new("example.com", Types.MX))
    rescue ResolvError
      # ...
    rescue ResolvTimeout
      # ...
    end

    # File lib/Dnsruby/Resolver.rb, line 214
    def send_message(message)
      Dnsruby.log.debug{"Resolver : sending message"}
      q = Queue.new
      send_async(message, q)
      #      # @TODO@ Add new queue tuples, e.g. :

      #      event_type = EventType::RECEIVED

      #      reply = nil

      #      while (event_type == EventType::RECEIVED)

      #        id, event_type, reply, error = q.pop

      #        Dnsruby.log.debug{"Resolver : result received"}

      #        if ((error != nil) && (event_type == EventType::ERROR))

      #          raise error

      #        end

      #        print "Reply = #{reply}\n"

      #      end

      #      print "Reply = #{reply}\n"

      #      return reply

      id, result, error = q.pop

      if (error != nil)
        raise error
      else
        return result
      end
    end

send_plain_message(message) click to toggle source

This method takes a Message (supplied by the client), and sends it to the configured nameservers. No changes are made to the Message before it is sent (TSIG signatures will be applied if configured on the Resolver). Retries are handled as the Resolver is configured to do. Incoming responses to the query are not cached or validated (although TCP fallback will be performed if the TC bit is set and the (Single)Resolver has ignore_truncation set to false). Note that the Message is left untouched - this means that no OPT records are added, even if the UDP transport for the server is specified at more than 512 bytes. If it is desired to use EDNS for this packet, then you should call the Dnsruby::PacketSender#prepare_for_dnssec(msg), or Dnsruby::PacketSender#add_opt_rr(msg) The return value from this method is the [response, error] tuple. Either of these values may be nil - it is up to the client to check.

example :

    require 'dnsruby'
    include Dnsruby
    res = Dnsruby::Resolver.new
    response, error = res.send_plain_message(Message.new("example.com", Types.MX))
    if (error)
      print "Error returned : #{error}\n"
    else
      process_response(response)
    end

    # File lib/Dnsruby/Resolver.rb, line 267
    def send_plain_message(message)
      Dnsruby::TheLog.debug("Resolver : send_plain_message")
      message.do_caching = false
      message.do_validation = false
      message.send_raw = true
      q = Queue.new
      send_async(message, q)
      id, result, error = q.pop
      return [result, error]
    end

set_config_nameserver(n) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 440
    def set_config_nameserver(n)
      # @TODO@ Should we allow NS RRSet here? If so, then .sort_by {rand}

      if (!@configured)
        @config.get_ready
      end
      @configured = true
      if (n).kind_of?String
        @config.nameserver=[n]
      else
        @config.nameserver=n
      end
      add_config_nameservers
    end

src_address6=(a) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 704
    def src_address6=(a)
      @src_address6 = a
      update
    end

src_address=(a) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 699
    def src_address=(a)
      @src_address = a
      update
    end

src_port() click to toggle source

The source port to send queries from Returns either a single Fixnum or an Array e.g. "0", or "[60001, 60002, 60007]"

Defaults to 0 - random port

    # File lib/Dnsruby/Resolver.rb, line 552
    def src_port
      if (@src_port.length == 1)
        return @src_port[0]
      end
      return @src_port
    end

src_port=(p) click to toggle source

Can be a single Fixnum or a Range or an Array If an invalid port is selected (one reserved by IANA), then an ArgumentError will be raised.

    res.src_port=0
    res.src_port=[60001,60005,60010]
    res.src_port=60015..60115

    # File lib/Dnsruby/Resolver.rb, line 567
    def src_port=(p)
      if (Resolver.check_port(p))
        @src_port = Resolver.get_ports_from(p)
        update
      end
    end

tsig=(t) click to toggle source

Sets the TSIG to sign outgoing messages with. Pass in either a Dnsruby::RR::TSIG, or a key_name and key (or just a key) Pass in nil to stop tsig signing.

- res.tsig=(tsig_rr)

- res.tsig=(key_name, key) # defaults to hmac-md5

- res.tsig=(key_name, key, alg) # e.g. alg = "hmac-sha1"

- res.tsig=nil # Stop the resolver from signing

    # File lib/Dnsruby/Resolver.rb, line 660
    def tsig=(t)
      @tsig=t
      update
    end

udp_size=(s) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 745
    def udp_size=(s)
      @udp_size = s
      update
    end

update_internal_res(res) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 516
    def update_internal_res(res)
      [:port, :use_tcp, :no_tcp, :tsig, :ignore_truncation, :packet_timeout,
        :src_address, :src_address6, :src_port, :recurse,
        :udp_size, :dnssec].each do |param|

        res.send(param.to_s+"=", instance_variable_get("@"+param.to_s))
      end
    end

use_tcp=(on) click to toggle source

    # File lib/Dnsruby/Resolver.rb, line 643
    def use_tcp=(on)
      @use_tcp = on
      update
    end

[Validate]

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