def fromXml(str):
elem = etree.XML(str)
if elem.tag != 'rule':
error("ERROR: Invalid XML, expected \'rule\' element", ERROR_INVALID_XML_NO_RULE)
action=elem.get('action', '').lower()
if action == '':
error("ERROR: Invalid XML, no action specified", ERROR_INVALID_XML_NO_ACTION_XML)
protocol=elem.get('protocol', ANY_PROTOCOL).lower()
rule = UFWRule(action, protocol)
rule.position=int(elem.get('position', 0))
rule.direction=elem.get('direction', 'in').lower()
rule.dapp=elem.get('dapp', '')
rule.sapp=elem.get('sapp', '')
rule.dport=elem.get('dport', ANY_PORT)
rule.sport=elem.get('sport', ANY_PORT)
rule.dst=elem.get('dst', ANY_ADDR)
rule.src=elem.get('src', ANY_ADDR)
rule.interface_in=elem.get('interface_in', '')
rule.interface_out=elem.get('interface_out', '')
rule.logtype=elem.get('logtype', '').lower()
rule.v6=elem.get('v6', 'False').lower() == "true"
return rule