reverse-skills-max: initial public release (restored, redacted, hardened)
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# Protocol reverse 速查
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> 适用:`protocol-reverse` skill · 2026-07-18
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## 常见布局模式
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| 模式 | 特征 | 提示 |
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|------|------|------|
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| 定长头+体 | 前 2/4 字节长度 | 注意是否包含头长 |
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| 魔数 | 固定 `0xDEAD` 等 | 便于流再同步 |
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| TLV | type-length-value 重复 | type 枚举即消息字典 |
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| Protobuf | 字段号 varint | `protoc --decode_raw` |
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| 加密帧 | 熵高、无明文 URL | 先找 nonce/IV 邻域 |
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## 最小 Python 骨架
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```python
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import struct
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def parse_frame(buf: bytes):
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magic, length, msg_type = struct.unpack_from(">IHI", buf, 0)
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body = buf[10:10+length]
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return {"magic": magic, "type": msg_type, "body": body}
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```
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## PCAP 提取 TCP payload
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```bash
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tshark -r cap.pcap -Y "tcp.port==4433" -T fields -e tcp.payload | head
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```
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