Simple SSH tunnel

CURRENT_PATH = File.expand_path(File.dirname(__FILE__))

def my_system(*cmd) 
  pid = fork do 
    exec(*cmd) 
    exit! 127 
  end 
  yield pid if block_given? 
  Process.waitpid(pid) 
  $? 
end 

def get_pid
  begin
    f = File.new(File.join(CURRENT_PATH, "pid.pid"), "r")
    pid = f.readline.gsub("\n", '').to_i
  rescue
    pid = -1
  end
  pid > 0 ? pid : nil
end

def set_pid(pid)
  File.open(File.join(CURRENT_PATH, "pid.pid"), "w") do |f|
    f.puts pid
  end
end

if pid = get_pid
  puts "Killing process #{pid}"
  Process.kill(9, pid)
  File.delete(File.join(CURRENT_PATH, "pid.pid"))
else
  # my_system("ssh -2 -f -c blowfish -N -C #{IP} -L 8080/127.0.0.1/80") do |pid| 
  my_system("ssh -2 -f -c blowfish -N -C #{IP} -D 8080") do |pid| 
    pid += 1
    puts "Pid is #{pid}"
    set_pid(pid)
  end
end