Basic Implementation of Remote SSH-FORWARDING of multiple port instance

ssh_tun.py

#!/usr/bin/python2

from sys import argv
from os import system

CMD  		= 'autossh -M 0 -o "ServerAliveInterval 30" -o "ServerAliveCountMax 3"'
DEF_SERVER	= '0.0.0.0'
DEF_LOCAL 	= '127.0.0.1'
DEF_TUN 	= 30000

def parse_args(server_in, local_in, port):
	global DEF_TUN
	param 	=' -R {}:{}:{}:{}'.format(server_in, DEF_TUN, local_in, port)
	DEF_TUN +=1
	return param

def usage():
	print 'USAGE   : ./ssh_tun.py [OPTIONS]'
	print 'OPTIONS'
	print '[+] -i server_in\t: server interface; Default = 0.0.0.0'
	print '[+] -I local_in\t\t: local interface; Default = localhost'
	print '[+] -u user\t\t: server user'
	print '[+] -h hostname\t\t: Server hostname'
	print '[+] --key priv_key\t: Private key path'
	print '[+] -p "ports"\t\t: Local open-ports'

def main():
	server 		= argv[argv.index('-i') + 1] if '-I' in argv else DEF_SERVER
	local  		= argv[argv.index('-I') + 1] if '-I' in argv else DEF_LOCAL
	user 		= argv[argv.index('-u') + 1] if '-u' in argv else None
	priv_key 	= argv[argv.index('--key') + 1] if '--key' in argv else None
	hostname	= argv[argv.index('-h') + 1] if '-h' in argv else None
	port 		= argv[argv.index('-p') + 1] if '-p' in argv else ''
	
	if user and priv_key and hostname and port:
		try:
			print '[+] Connecting'
			params = ''
			for i in port.split():
				params  += parse_args(server,local, i)
			command = '{}{} {}@{} -i {}'.format(CMD, ''.join(params), user, hostname, priv_key)
			print '[v] Connection established'
			system(command)
		except:
			raise Exception('Error')
	else:
		usage()

if __name__ == '__main__':
	main()