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require 'open3'
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require 'socket'
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require 'timeout'
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class PortInUse < StandardError; end
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class WsProxy
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attr_accessor :host, :host_port, :password, :timeout, :idle_timeout, :ssl_target
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attr_reader :proxy_port
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# Allowed ports to communicate with our web sockets proxy
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PORTS = 5910..5930
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def initialize(attributes)
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# setup all attributes.
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defaults.merge(attributes).each do |k, v|
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self.send("#{k}=", v) if self.respond_to?("#{k}=")
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end
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end
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def self.start(attributes)
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proxy = WsProxy.new(attributes)
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proxy.start_proxy
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end
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def free_port? port
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socket = Socket.new :INET, :STREAM
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socket.bind(Socket.pack_sockaddr_in(port, '127.0.0.1'))
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return true
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rescue Errno::EADDRINUSE
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return false
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ensure
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socket.close unless socket.nil?
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end
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def start_proxy
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# randomly preselect free tcp port from the range
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port = 0
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Timeout.timeout(5) do
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until free_port?(port = rand(PORTS)); end
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end
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# execute websockify proxy
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begin
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cmd = "#{ws_proxy} --daemon --idle-timeout=#{idle_timeout} --timeout=#{timeout} #{port} #{host}:#{host_port}"
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cmd += " --ssl-target" if ssl_target
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if Setting[:websockets_encrypt]
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cmd += " --cert #{Setting[:websockets_ssl_cert]}" if Setting[:websockets_ssl_cert]
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cmd += " --key #{Setting[:websockets_ssl_key]}" if Setting[:websockets_ssl_key]
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end
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execute(cmd)
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rescue PortInUse
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# fallback just in case of race condition
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port += 1
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if port >= PORTS.last
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raise ::Foreman::Exception.new(N_('No free ports available for websockify, try again later'))
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else
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retry
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end
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end
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@proxy_port = port
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{ :host => host, :port => host_port, :password => password, :proxy_port => proxy_port }
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end
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private
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def ws_proxy
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"#{Rails.root}/extras/noVNC/websockify.py"
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end
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def defaults
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{
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:timeout => 120,
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:idle_timeout => 120,
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:host_port => 5900,
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:host => "0.0.0.0"
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}
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end
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def logger
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Rails.logger
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end
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def execute(cmd)
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logger.debug "Starting VNC Proxy: #{cmd}"
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Open3.popen3(cmd) do |stdin, stdout, stderr|
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stdout.each do |line|
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logger.debug "[#{line}"
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end
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stderr.each do |line|
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logger.debug "VNCProxy Error: #{line}"
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raise PortInUse if line["socket.error: [Errno 98] Address already in use"]
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end
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end
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end
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end
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