class VMHelper:

	def createArguments(self, config):
		args = ""
		if ('cpu' in config):
			args += " -cpu " + config['cpu']
		if ('smp' in config):
			args += " -smp " + str(config['smp'])
		if ('memory' in config):
			args += " -m " + str(config['memory'])
		if ('disk' in config):
			disk = config['disk']
			if ('file' in disk):
				args += " -drive file=" + disk['file']
				if ('hw' in disk):
					args += ",if=" + disk['hw']
		if ('cdrom' in config):
			args += " -cdrom " + config['cdrom']
		if ('network' in config):
			net = config['network']
			args += " -net nic,vlan=1"
			if ('mac' in net):
				args += ",macaddr=" + net['mac']
			if ('hw' in net):
				args += ",model=" + net['hw']
			args += " -net tap,vlan=1"
			if ('dev' in net):
				args += ",ifname=" + net['dev']
			args += ",script=no"
		if ('vnc' in config):
			vnc = config['vnc']
			if ('display' in vnc):
				args += " -vnc 127.0.0.1:" + str(vnc['display'])
		if ('keyboard' in config):
			args += " -k " + config['keyboard']
		if ('kernel' in config):
			args += " -kernel " + config['kernel']
		if ('append' in config):
			args += " -append \"" + config['append'] + "\""
		return args

	def setupNetwork(self, config):
		foo = ""
		if ('network' in config):
			net = config['network']
			if ('dev' in net):
				foo += "tunctl -d " + net['dev'] + "\n"
				foo += "ip link set dev " + net['dev'] +" up\n"
				foo += "ip addr add dev " + net['dev'] +" 0.0.0.0\n"
				if ('ip' in net):
					for ip in net['ip']:
						foo += "ip route add " + ip + " dev " + net['dev'] + "\n"
						# TODO create extra chain
						foo += "iptables -A FORWARD -i " + net['dev'] + " -s " + ip + " -j ACCEPT\n"
				foo += "iptables -A FORWARD -i " + net['dev'] + " -j REJECT --reject-with icmp-admin-prohibited\n"
				if ('ipv6' in net):
					for ipv6 in net['ipv6']:
						foo += "ip -6 route add " + ipv6 + " dev " + net['dev'] + "\n"
						foo += "ip6tables -A FORWARD -i " + net['dev'] + " -s " + ipv6 + " -j ACCEPT\n"
				foo += "iptables -A FORWARD -i " + net['dev'] + " -j REJECT --reject-with icmp6-adm-prohibited\n"
		return foo