|
require 'open3'
|
|
require 'socket'
|
|
require 'timeout'
|
|
|
|
class PortInUse < StandardError; end
|
|
|
|
class WsProxy
|
|
attr_accessor :host, :host_port, :password, :timeout, :idle_timeout, :ssl_target
|
|
attr_reader :proxy_port
|
|
|
|
# Allowed ports to communicate with our web sockets proxy
|
|
PORTS = 5910..5930
|
|
|
|
def initialize(attributes)
|
|
# setup all attributes.
|
|
defaults.merge(attributes).each do |k, v|
|
|
send("#{k}=", v) if respond_to?("#{k}=")
|
|
end
|
|
end
|
|
|
|
def self.start(attributes)
|
|
proxy = WsProxy.new(attributes)
|
|
proxy.start_proxy
|
|
end
|
|
|
|
def free_port?(port)
|
|
socket = Socket.new :INET, :STREAM
|
|
socket.bind(Socket.pack_sockaddr_in(port, '127.0.0.1'))
|
|
true
|
|
rescue Errno::EADDRINUSE
|
|
false
|
|
ensure
|
|
socket&.close
|
|
end
|
|
|
|
def start_proxy
|
|
# randomly preselect free tcp port from the range
|
|
port = 0
|
|
Timeout.timeout(5) do
|
|
until free_port?(port = rand(PORTS)); end
|
|
end
|
|
# execute websockify proxy
|
|
begin
|
|
cmd = "websockify --daemon --idle-timeout=#{idle_timeout} --timeout=#{timeout} #{port} #{host}:#{host_port}"
|
|
cmd += " --ssl-target" if ssl_target
|
|
if Setting[:websockets_encrypt]
|
|
cmd += " --cert #{Setting[:websockets_ssl_cert]}" if Setting[:websockets_ssl_cert]
|
|
cmd += " --key #{Setting[:websockets_ssl_key]}" if Setting[:websockets_ssl_key]
|
|
end
|
|
execute(cmd)
|
|
rescue Errno::ENOENT
|
|
raise ::Foreman::Exception.new(N_('Websockify was not found'))
|
|
rescue PortInUse
|
|
# fallback just in case of race condition
|
|
port += 1
|
|
if port >= PORTS.last
|
|
raise ::Foreman::Exception.new(N_('No free ports available for websockify, try again later'))
|
|
else
|
|
retry
|
|
end
|
|
end
|
|
@proxy_port = port
|
|
{ :port => proxy_port, :password => password, :encrypt => Setting[:websockets_encrypt] }
|
|
end
|
|
|
|
private
|
|
|
|
def defaults
|
|
{
|
|
:timeout => 120,
|
|
:idle_timeout => 120,
|
|
:host_port => 5900,
|
|
:host => "0.0.0.0",
|
|
}
|
|
end
|
|
|
|
def logger
|
|
Rails.logger
|
|
end
|
|
|
|
def execute(cmd)
|
|
logger.debug "Starting VNC Proxy: #{cmd}"
|
|
Open3.popen3(cmd) do |stdin, stdout, stderr|
|
|
stdout.each do |line|
|
|
logger.debug "[#{line}"
|
|
end
|
|
stderr.each do |line|
|
|
logger.debug "VNCProxy Error: #{line}"
|
|
raise PortInUse if line["socket.error: [Errno 98] Address already in use"]
|
|
end
|
|
end
|
|
end
|
|
end
|