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Implement the UDP checksum

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As long as we are doing UDP and IP in house, might as well do the
optional UDP checksum.
This commit is contained in:
Jarrod Johnson 2020-03-20 16:55:20 -04:00
parent 433f67730c
commit 20a26e6fdb
1 changed files with 11 additions and 0 deletions
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11
confluent_server/confluent/discovery/protocols/pxe.py
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@ -38,6 +38,12 @@ udphdr = b'\x00\x43\x00\x44\x00\x00\x00\x00'
def _ipsum(data):
currsum = 0
if len(data) % 2:
append = bytearray(2)
append[0] = data[-1]
currsum = struct.unpack('!H', append)
data = memoryview(data)
data = data[:-1]
for datum in struct.unpack('!' + 'H' * (len(data) // 2), data):
currsum += datum
if currsum >> 16:
@ -378,6 +384,11 @@ def check_reply(node, info, packet, sock, cfg, reqview):
curripsum = ~(_ipsum(constiphdrsum + pktlen + myipn)) & 0xffff
repview[10:12] = struct.pack('!H', curripsum)
repview[24:26] = struct.pack('!H', 256 + 8)
sumdata = repview[28:]
datasum = _ipsum(bytes(repview[12:]) + b'\x00\x11' + bytes(
repview[24:26]))
datasum = ~datasum & 0xffff
repview[26:28] = struct.pack('!H', datasum)
tsock = socket.socket(socket.AF_PACKET, socket.SOCK_DGRAM,
socket.htons(0x800))
targ = sockaddr_ll()