3c14e1e401
Python-based time management application with UDP discovery, TCP protocol communication, time sync, and drift monitoring. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
89 lines
2.9 KiB
Python
89 lines
2.9 KiB
Python
"""DIBD 응답 패킷 파싱 (가변 길이 지원)"""
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from models.controller import Controller
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from config import PROTOCOL_ENCODING
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def parse_dibd_packet(data: bytes) -> Controller | None:
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"""DIBD 응답 패킷을 파싱하여 Controller 객체를 반환.
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패킷 길이:
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- 이더넷 전용 모델: 174바이트 (DNS Name까지)
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- WiFi 지원 모델: 222바이트 (AP Mode까지)
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패킷 구조 (0x88 응답, \r\n으로 필드 구분):
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0-5: 'DIBD\\r\\n'
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6-24: MAC (17자) + \\r\\n
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25-41: Local IP (15자) + \\r\\n
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42-58: Subnet Mask (15자) + \\r\\n
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59-75: Gateway IP (15자) + \\r\\n
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76-82: Port (5자) + \\r\\n
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83-86: DHCP Mode (2자) + \\r\\n
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87-103: Server IP (15자) + \\r\\n
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104-110: Server Port (5자) + \\r\\n
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111-114: Server Mode (2자) + \\r\\n
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115-136: Name (20자) + \\r\\n
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137-141: KeepAlive (3자) + \\r\\n
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142-173: DNS Name (30자) + \\r\\n ← 174바이트 여기까지
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174-195: AP SSID Name (20자) + \\r\\n ← 선택
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196-217: AP SSID PW (20자) + \\r\\n ← 선택
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218-221: AP Mode (2자) + \\r\\n ← 선택
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"""
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try:
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text = data.decode(PROTOCOL_ENCODING, errors="replace")
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except Exception:
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return None
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# 최소 길이: KeepAlive 필드까지 = 142바이트
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if len(text) < 142:
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return None
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if not text.startswith("DIBD"):
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return None
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ctrl = Controller()
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ctrl.mac = text[6:23].strip()
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ctrl.ip = _normalize_ip(text[25:40].strip())
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ctrl.subnet = _normalize_ip(text[42:57].strip())
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ctrl.gateway = _normalize_ip(text[59:74].strip())
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ctrl.port = _safe_int(text[76:81].strip(), 5000)
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ctrl.dhcp_mode = _safe_int(text[83:85].strip(), 30) % 30
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ctrl.server_ip = _normalize_ip(text[87:102].strip())
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ctrl.server_port = _safe_int(text[104:109].strip(), 0)
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ctrl.server_mode = _safe_int(text[111:113].strip(), 30) % 30
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ctrl.name = text[115:135].strip()
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ctrl.keep_alive = _safe_int(text[137:140].strip(), 0)
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# DNS Name (선택 - 174바이트 이상)
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if len(text) >= 172:
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ctrl.dns_name = text[142:172].strip()
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# AP SSID (선택 - 222바이트 패킷)
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if len(text) >= 194:
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ctrl.ap_ssid_name = text[174:194].strip()
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if len(text) >= 216:
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ctrl.ap_ssid_pw = text[196:216].strip()
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if len(text) >= 220:
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ctrl.ap_mode = _safe_int(text[218:220].strip(), 30) % 30
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return ctrl
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def _normalize_ip(ip_str: str) -> str:
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"""패딩된 IP(예: '192.168.000.074')를 일반형(예: '192.168.0.74')으로 변환."""
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try:
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parts = ip_str.split(".")
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return ".".join(str(int(p)) for p in parts)
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except (ValueError, IndexError):
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return ip_str
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def _safe_int(s: str, default: int = 0) -> int:
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try:
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return int(s)
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except (ValueError, TypeError):
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return default
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