#! /usr/bin/env python3
# encoding: utf-8

import jsmin
import json
import os
import sys

if __name__ == "__main__":
	if len(sys.argv) == 2:
		cfg_path = sys.argv[1]
	else:
		cfg_path = "/etc/safe-harbor/config.json"
	
	with open(cfg_path) as f:
		cfg = json.loads(jsmin.jsmin(f.read()))
	
	command = ["/usr/bin/ssh", "ssh", "-o", "ServerAliveInterval 45", "-o", "ServerAliveCountMax 2", "-o", "ExitOnForwardFailure yes", "-N"]
	
	for m in cfg["mapping"]:
		command.append("-R")
		command.append("%d:localhost:%d" %(m["remote"], m["local"]))
	
	command.append("%s@%s" %(cfg["user"], cfg["host"]))
	
	# replace this process, systemd will restart us if needed
	os.execl(*command)