Net::SSH 'dumb forward' mode

net_ssh_dumb_forward.rb

def ports, offset = [], 0
# ...

Net::SSH.start(hostname, user, :forward_agent => true, :verbose => :warn) do |ssh|
	ports.each do |port|
		ssh.forward.local port + offset, 'localhost', port
	end

	# loop, with an event loop every 0.1s, until Ctrl-C is pressed
	puts "[Ctrl-C] to terminate..."
	interrupted = false
	trap('INT') { interrupted = true }
	ssh.loop(0.1) {
		not interrupted
	}

	ports.each do |port|
		ssh.forward.cancel_local port + offset
	end
end