def sum_checksum(self):
src_guid_hex = binascii.a2b_hex(self.src_guid)
dst_guid_hex = binascii.a2b_hex(self.dst_guid)
service_type_hex = binascii.a2b_hex(self.service_type)
header_len_hex = binascii.a2b_hex(int2byte(self.header_len, 8))
other = src_guid_hex + dst_guid_hex + service_type_hex + header_len_hex
return self.checksum(other)
def icn2byte(self):
src_guid_hex = binascii.a2b_hex(self.src_guid)
dst_guid_hex = binascii.a2b_hex(self.dst_guid)
service_type_hex = binascii.a2b_hex(self.service_type)
header_len_hex = binascii.a2b_hex(int2byte(self.header_len, 8))
header_checksum_hex = binascii.a2b_hex(self.header_checksum)
hex_result = src_guid_hex + dst_guid_hex + service_type_hex + header_len_hex + header_checksum_hex + self.tlv + self.payload
return hex_result
def checksum(self, data):
length = len(data)
checksum = 0
for i in range(0, length):
checksum += int.from_bytes(data[i:i + 1], 'little', signed=False)
checksum &= 0xffff
checksum_hex = int2byte(checksum, 16)
return checksum_hex
def query_hrn(self, data):
eid = binascii.b2a_hex(data[1:17]).decode("utf-8")
result = self.ncsdb.query(self.tbl_name, {"EID": eid})
if result == None:
payload = binascii.a2b_hex("06" + "02" + "00")
else:
hrn = result["HRN"].encode("utf-8")
hrn_len = len(hrn)
payload = binascii.a2b_hex("06" + "01") + binascii.a2b_hex(
int2byte(hrn_len, 8)) + hrn
return payload
def query_eid(self, hrn):
icn_packet = ICNPacket()
icn_packet.setHeader("226cf119b78825f1720cf2ca485c2d85",
"00000000000000000000000000000000", "00")
cmd_type = binascii.a2b_hex("03")
hrn_hex = hrn.encode("utf-8")
hrn_len = len(hrn_hex)
icn_packet.setPayload(cmd_type +
binascii.a2b_hex(int2byte(hrn_len, 8)) + hrn_hex)
icn_packet.fill_packet()
reply = self.send(icn_packet)
cmd_type = int(binascii.b2a_hex(reply.payload[:1]), 16)
ack = int(binascii.b2a_hex(reply.payload[1:2]), 16)
if cmd_type == 4 and ack == 1:
eid = binascii.b2a_hex(reply.payload[2:18])
return eid.decode("utf-8")
else:
return None