def dohandshake(self, msg):
"""Function to carry out handshake
Switch (hello) => hello + feature request
Switch (feature reply) => DONE
"""
if (msg.header.type == pyopenflow.OFPT_HELLO):
sendmsg = pyopenflow.ofp_hello()
self.send(sendmsg.pack())
sendmsg = pyopenflow.ofp_header()
sendmsg.type = pyopenflow.OFPT_FEATURES_REQUEST
self.send(sendmsg.pack())
elif (msg.header.type == pyopenflow.OFPT_FEATURES_REPLY):
switch_feature = pyopenflow.ofp_switch_features()
switch_feature.unpack(msg.message)
self.dpid = switch_feature.datapath_id
output.info("Connected to switch %x" % self.dpid,
self.__class__.__name__)
self.handshake = True
else:
output.warn("Handshake should not handle message type "+\
pyopenflow.ofp_type[msg.header.type],
self.__class__.__name__)
def __init__(self, sock, msg):
"""Initialize
@param sock reference to socket
@param msg message
"""
ofcomm.message.__init__(self, sock, msg)
##Features struct
self.features = None
if (self.header.type == pyof.OFPT_FEATURES_REPLY):
self.features = pyof.ofp_switch_features()
r = self.features.unpack(msg)
while (len(r) >= pyof.OFP_PHY_PORT_BYTES):
p = pyof.ofp_phy_port()
r = p.unpack(r)
self.features.ports.append(p)
if (len(r) > 0):
output.warn("Features reply is of irregular length with "+\
str(len(r))+" bytes remaining.",
self.__class__.__name__)
output.dbg("Received switch features:\n"+\
self.features.show("\t"),
self.__class__.__name__)
