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Implement UDP checksum

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Properly implement checksum
on ACK.
This commit is contained in:
Jarrod Johnson
2020-04-07 17:36:51 -04:00
parent fe3d9da5aa
commit 137e35217b
1 changed files with 2 additions and 1 deletions
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confluent_server/confluent/discovery/protocols/pxe.py
+2 -1
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@@ -541,10 +541,11 @@ def ack_request(pkt, rq, info):
repview = memoryview(reply)
repview[:len(rply)] = rply
repview[270:271] = b'\x05'
repview[26:28] = struct.pack('!H', 0) # TODO: use datasum, it was incorrect)
datasum = _ipsum(b'\x00\x11' + repview[24:26].tobytes() +
repview[12:len(rply)].tobytes())
datasum = ~datasum & 0xffff
repview[26:28] = struct.pack('!H', 0) # TODO: use datasum, it was incorrect)
repview[26:28] = struct.pack('!H', datasum)
send_raw_packet(repview, len(rply), rq, info)
def consider_discover(info, packet, sock, cfg, reqview):