Class: Scriptroute::LivenessTest

Inherits:
Object
  • Object
show all
Defined in:
lib/scriptroute/liveness.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(destinations) ⇒ LivenessTest

Returns a new instance of LivenessTest.



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# File 'lib/scriptroute/liveness.rb', line 89

def initialize(destinations)
  @responsives = []
  @unresponsives = []
  @broken = []
  if(destinations.is_a?(String)) then
    # promote to an array
    destinations = [ destinations ]
  end
  if(destinations.length == 0) then
    raise "Empty array passed to LivenessTest.new()"
  end
  icmp_responsive, icmp_unresponsive = LivenessTest.try_icmp(destinations);
  @pingfiltering, @unresponsives = if(icmp_unresponsive.length > 0) then
                                     LivenessTest.try_tcp(icmp_unresponsive, false);
                                   else
                                     [[], [] ]
                                   end
  @responsives, @broken = if(icmp_responsive.length > 0) then
                            LivenessTest.try_tcp(icmp_responsive, true);
                          else
                            [[], []]
                          end
end

Instance Attribute Details

#broken ⇒ Object (readonly)

do ping, but not http.



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# File 'lib/scriptroute/liveness.rb', line 7

def broken
  @broken
end

#pingfiltering ⇒ Object (readonly)

Returns the value of attribute pingfiltering.



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# File 'lib/scriptroute/liveness.rb', line 6

def pingfiltering
  @pingfiltering
end

#responsives ⇒ Object (readonly)

whether a host is responsive for measurement; try_icmp or try_tcp.



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# File 'lib/scriptroute/liveness.rb', line 5

def responsives
  @responsives
end

#unresponsives ⇒ Object (readonly)

Returns the value of attribute unresponsives.



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# File 'lib/scriptroute/liveness.rb', line 8

def unresponsives
  @unresponsives
end

Class Method Details

.try_icmp(destinations) ⇒ Object 



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# File 'lib/scriptroute/liveness.rb', line 9

def LivenessTest.try_icmp(destinations)
  retvalResponsives = []
  retvalUnresponsives = []
  begin 
    responses = Scriptroute::send_train( destinations.map { |dst|
        begin
          probe = Scriptroute::ICMPecho.new
          probe.ip_dst = dst
          Struct::DelayedPacket.new(0.01,probe)
        rescue RuntimeError => e
          # happens if dns lookup doesn't work; we'll mark it dead.
          # 2013-aug added to handle dns fail.
          retvalUnresponsives.push(dst)
          nil
        rescue => e
          # happens if dns lookup doesn't work; we'll mark it dead.
          retvalUnresponsives.push(dst)
          nil
        end
      }.compact )
    responses.each_with_index { |tuple,i|
      if(tuple.response && 
          tuple.response.packet.is_a?(Scriptroute::ICMP) && 
          tuple.response.packet.icmp_type == Scriptroute::ICMP::ICMP_ECHOREPLY) then
        retvalResponsives.push(destinations[i])
      else
        retvalUnresponsives.push(destinations[i])
      end
    }
  rescue => e
    if(e=~/packet (%d) of %d/) then
      puts "LivenessTest.try_icmp(#{destinations.join(', ')}) took #{e} when 
contacting %s (or maybe %s)" % [ destinations[$1.to_i], destinations[$1.to_i-1] ]
    else
      puts "LivenessTest.try_icmp(#{destinations.join(', ')}) took #{e}"
    end
  end
  return retvalResponsives, retvalUnresponsives;
end

.try_tcp(destinations, use_syn = false) ⇒ Object 



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# File 'lib/scriptroute/liveness.rb', line 49

def LivenessTest.try_tcp(destinations, use_syn=false) 
  retvalResponsives = []
  retvalUnresponsives = []
  if (destinations.length < 1) then
    raise "you want to give a list of destinations to probe"
  end
  begin
    responses = Scriptroute::send_train( destinations.map { |dst|
        probe = Scriptroute::TCP.new(0) 
        probe.ip_dst = dst
        probe.flag_syn = use_syn
        probe.flag_ack = !use_syn
        if(use_syn) then 
          probe.th_dport = 80
        end
        Struct::DelayedPacket.new(0.01,probe)
      } )
    responses.each_with_index { |tuple,i|
      puts tuple.probe.inspect
      puts (tuple.response.inspect or "no response")
      # puts tuple.to_s
      if(tuple.response && tuple.response.packet.is_a?(Scriptroute::TCP) && 
          ( (use_syn && tuple.response.packet.flag_syn) || 
            (!use_syn && tuple.response.packet.flag_rst)) ) then
        retvalResponsives.push(destinations[i])
      else
        retvalUnresponsives.push(destinations[i])
      end
    }
  rescue => e
    if(e.to_s =~ /packet (\d+) of \d+/) then
      puts "LivenessTest.try_tcp(...) took #{e} (#{$1} is to #{destinations[$1.to_i]} maybe #{destinations[$1.to_i - 1]} "
    else
      puts "LivenessTest.try_tcp(#{destinations.join(', ')}) took #{e} #{e.backtrace[0]}"
    end
    return destinations, []; 
  end
  return retvalResponsives, retvalUnresponsives;
end

Instance Method Details

#summary ⇒ Object 



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# File 'lib/scriptroute/liveness.rb', line 119

def summary
  "%d responsive, %d unresponsive" % [ @responsives.length, @unresponsives.length ]
end

#to_s ⇒ Object 



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# File 'lib/scriptroute/liveness.rb', line 113

def to_s
  "Responsives:   " + @responsives.join(" ") + 
    "\nUnresponsivees: " + @unresponsives.join(" ") +
    "\nPing Filtering: " + @pingfiltering.join(" ") +
    "\nBroken (ping not http): " + @broken.join(" ")
end