CydandClaude Opus 4.8
e12bfe1d3a
Captured a real mission egg delivered from the SheepShaver console to the DOSBox pod on TCP 1501, no -egg bypass: 8x ReceiveEggFileMessage chunks, 7514 bytes, reassembled byte-perfect (declared notationFileLength=7514). The egg is the operator's own mission (BattleTech / cavern / night / freeforall, pilot "cyd", vehicle madcat). This closes the networking workstream end to end. - net-tools/decode_egg.py: reassemble an egg from a captured console->pod TCP payload hex dump (skips interleaved StateQuery polls). - net-tools/captured_cavern_mission.egg: the delivered egg. - NET-NOTES.md: milestone writeup + the pod's mission-LOAD crash. The pod faults loading the mission (page fault, wild ptr 0xFF008B5B, exception 000E at game 00FF:219D, NetNub Munga exit 14) -- a game-side bug in the mission-load path, separate from networking. Leading suspect: RIO was disabled for this run and the player vehicle/control setup derefs null. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
40 lines
1.5 KiB
Python
40 lines
1.5 KiB
Python
#!/usr/bin/env python3
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"""Reassemble a mission egg from a captured console->pod TCP stream.
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Input: a hex dump of the concatenated console->pod TCP payloads, e.g.
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tshark -r cap.pcapng -Y 'ip.src==<console> && tcp.len>0' \
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-T fields -e tcp.payload | tr -d '\n' > c2p.hex
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The console delivers the mission as a series of ReceiveEggFileMessage
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packets (decoded from CODE/RP/MUNGA/NETWORK.HPP, wire is little-endian):
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NetworkPacketHeader (16B) + Receiver::Message hdr (12B: messageLength@+16,
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messageID@+20, flags@+24) + [egg body when messageLength==1024:
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sequenceNumber, notationFileLength, thisMessageLength, notationData[1000]].
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StateQuery packets (messageLength=16) are interleaved and skipped.
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Usage: python decode_egg.py c2p.hex out.egg
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"""
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import sys, struct
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data = bytes.fromhex(open(sys.argv[1]).read())
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out = sys.argv[2] if len(sys.argv) > 2 else "reassembled.egg"
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i, chunks, total = 0, {}, None
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while i + 28 <= len(data):
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mlen, mid = struct.unpack("<ii", data[i+16:i+24])
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if mlen < 12 or mlen > 4000:
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break
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pkt = data[i:i+16+mlen]
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if len(pkt) < 16 + mlen:
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break
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if mlen == 1024: # ReceiveEggFileMessage
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seq, flen, tlen = struct.unpack("<iii", pkt[28:40])
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chunks[seq] = pkt[40:40+tlen]
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total = flen
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i += 16 + mlen
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egg = b"".join(chunks[k] for k in sorted(chunks))
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open(out, "wb").write(egg)
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print(f"chunks={len(chunks)} reassembled={len(egg)}B declared={total} "
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f"complete={total is not None and len(egg) >= total} -> {out}")
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