def _create_one_hop_path(self, egress_if):
ts = int(SCIONTime.get_time())
info = InfoOpaqueField.from_values(ts, self.addr.isd_as[0], hops=2)
hf1 = HopOpaqueField.from_values(self.HOF_EXP_TIME, 0, egress_if)
hf1.set_mac(self.of_gen_key, ts, None)
# Return a path where second HF is empty.
return SCIONPath.from_values(info, [hf1, HopOpaqueField()])
def _create_pcbm(self, in_if, out_if, ts, prev_hof, xover=False):
hof = HopOpaqueField.from_values(self.HOF_EXP_TIME,
in_if,
out_if,
xover=xover)
hof.set_mac(self.of_gen_key, ts, prev_hof)
in_info = self._mk_if_info(in_if)
out_info = self._mk_if_info(out_if)
return PCBMarking.from_values(in_info["remote_ia"],
in_info["remote_if"], in_info["mtu"],
out_info["remote_ia"],
out_info["remote_if"], hof,
self._get_if_rev_token(in_if))
def _create_pcbm(self, in_if, out_if, ts, prev_hof, xover=False):
in_info = self._mk_if_info(in_if)
if in_info["remote_ia"].int() and not in_info["remote_if"]:
return None
out_info = self._mk_if_info(out_if)
if out_info["remote_ia"].int() and not out_info["remote_if"]:
return None
hof = HopOpaqueField.from_values(
self.HOF_EXP_TIME, in_if, out_if, xover=xover)
hof.set_mac(self.of_gen_key, ts, prev_hof)
return PCBMarking.from_values(
in_info["remote_ia"], in_info["remote_if"], in_info["mtu"],
out_info["remote_ia"], out_info["remote_if"], hof)
def _create_ad_marking(self):
"""
Create an AD Marking with the given ingress and egress interfaces.
"""
hof = HopOpaqueField.from_values(1, 111, 222)
rev_token = HashChain(Random.new().read(32)).next_element()
pcbm = PCBMarking.from_values(1, 10, hof)
peer_markings = []
signing_key = read_file(get_sig_key_file_path(1, 10))
signing_key = base64.b64decode(signing_key)
data_to_sign = (b'11' + pcbm.hof.pack())
signature = sign(data_to_sign, signing_key)
return ADMarking.from_values(pcbm, peer_markings, rev_token, signature)
def handle_one_hop_path(self, hdr, spkt, from_local_as):
if len(spkt.path) != InfoOpaqueField.LEN + 2 * HopOpaqueField.LEN:
logging.error("OneHopPathExt: incorrect path length.")
return [(RouterFlag.ERROR,)]
if not from_local_as: # Remote packet, create the 2nd Hop Field
info = spkt.path.get_iof()
hf1 = spkt.path.get_hof_ver(ingress=True)
exp_time = OneHopPathExt.HOF_EXP_TIME
hf2 = HopOpaqueField.from_values(exp_time, self.interface.if_id, 0)
hf2.set_mac(self.of_gen_key, info.timestamp, hf1)
# FIXME(PSz): quite brutal for now:
spkt.path = SCIONPath.from_values(info, [hf1, hf2])
spkt.path.inc_hof_idx()
return []
def _create_pcbm(self, in_if, out_if, ts, prev_hof, xover=False):
in_info = self._mk_if_info(in_if)
if in_info["remote_ia"].int() and not in_info["remote_if"]:
return None
out_info = self._mk_if_info(out_if)
if out_info["remote_ia"].int() and not out_info["remote_if"]:
return None
exp_time = self.hof_exp_time(ts)
if exp_time <= 0:
logging.error("Invalid hop field expiration time value: %s",
exp_time)
return None
hof = HopOpaqueField.from_values(exp_time, in_if, out_if, xover=xover)
hof.set_mac(self.of_gen_key, ts, prev_hof)
return PCBMarking.from_values(in_info["remote_ia"],
in_info["remote_if"], in_info["mtu"],
out_info["remote_ia"],
out_info["remote_if"], hof)
