Method: NetworkScanner::Scanner#check_hostnames

Defined in:

lib/network_scanner.rb

#check_hostnames ⇒ Object

Raises:

• (Exception)

# File 'lib/network_scanner.rb', line 195

def check_hostnames
  raise Exception.new("Must scan ips first (Specify an interface or cacheread)") unless @ips_to_check

  puts "Scanning for hostnames out of a total of #{@ips_to_check.length} ips"

  if self.output_name
    out = File.open(self.output_name, 'w')
  else
    out = STDOUT
  end

  pool = Thread.pool(@pool_size)

  @ip_hosts = []

  @ips_to_check.each do |ip|
    pool.process do
      scan = `nslookup #{ip}`
      hostname = scan[/name\ =\ (.*)\n/, 1]
      if hostname
        @ip_hosts << [ip, hostname]
        if text?
          out.print "#{hostname} => #{ip}\n"
        end
      end
    end
  end

  pool.shutdown

  if json?
    out.puts(JSON.pretty_generate(@ip_hosts))
  end

  out.close unless out == STDOUT

  return @ip_hosts
end