Add per-service customization, stealth hardening, and BYOS support

- HTTP: configurable server_header, response_code, fake_app presets
  (apache/nginx/wordpress/phpmyadmin/iis), extra_headers, custom_body,
  static files directory mount
- SSH/Cowrie: configurable kernel_version, hardware_platform, ssh_banner,
  and users/passwords via COWRIE_USERDB_ENTRIES; switched to build mode
  so cowrie.cfg.j2 persona fields and userdb.txt generation work
- SMTP: configurable banner and MTA hostname
- MySQL: configurable version string in protocol greeting
- Redis: configurable redis_version and os string in INFO response
- BYOS: [custom-*] INI sections define bring-your-own Docker services
- Stealth: rename all *_honeypot.py → server.py; replace HONEYPOT_NAME
  env var with NODE_NAME across all 22+ service templates and plugins;
  strip "honeypot" from all in-container file content
- Config: DeckyConfig.service_config dict; INI [decky-N.svc] subsections;
  composer passes service_cfg to compose_fragment
- 350 tests passing (100%)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/llmnr/server.py

@@ -0,0 +1,129 @@
+#!/usr/bin/env python3
+"""
+LLMNR / mDNS poisoning detector (UDP 5355 and UDP 5353).
+Listens for any incoming name-resolution queries. Any traffic here is a
+strong signal of an attacker running Responder or similar tools on the LAN.
+Logs every packet with source IP and decoded query name where possible.
+"""
+
+import asyncio
+import json
+import os
+import socket
+import struct
+from datetime import datetime, timezone
+
+NODE_NAME = os.environ.get("NODE_NAME", "lan-host")
+LOG_TARGET = os.environ.get("LOG_TARGET", "")
+
+
+def _forward(event: dict) -> None:
+    if not LOG_TARGET:
+        return
+    try:
+        host, port = LOG_TARGET.rsplit(":", 1)
+        with socket.create_connection((host, int(port)), timeout=3) as s:
+            s.sendall((json.dumps(event) + "\n").encode())
+    except Exception:
+        pass
+
+
+def _log(event_type: str, **kwargs) -> None:
+    event = {
+        "ts": datetime.now(timezone.utc).isoformat(),
+        "service": "llmnr",
+        "host": NODE_NAME,
+        "event": event_type,
+        **kwargs,
+    }
+    print(json.dumps(event), flush=True)
+    _forward(event)
+
+
+def _decode_dns_name(data: bytes, offset: int) -> str:
+    """Decode a DNS-encoded label sequence starting at offset."""
+    labels = []
+    visited = set()
+    pos = offset
+    while pos < len(data):
+        if pos in visited:
+            break
+        visited.add(pos)
+        length = data[pos]
+        if length == 0:
+            break
+        if length & 0xc0 == 0xc0:  # pointer
+            if pos + 1 >= len(data):
+                break
+            ptr = ((length & 0x3f) << 8) | data[pos + 1]
+            labels.append(_decode_dns_name(data, ptr))
+            break
+        pos += 1
+        labels.append(data[pos:pos + length].decode(errors="replace"))
+        pos += length
+    return ".".join(labels)
+
+
+def _parse_query(data: bytes, proto: str, src_addr) -> None:
+    """Parse DNS/LLMNR/mDNS query and log the queried name."""
+    try:
+        if len(data) < 12:
+            raise ValueError("too short")
+        flags = struct.unpack(">H", data[2:4])[0]
+        qr = (flags >> 15) & 1
+        qdcount = struct.unpack(">H", data[4:6])[0]
+        if qr != 0 or qdcount < 1:
+            return  # not a query or no questions
+        name = _decode_dns_name(data, 12)
+        pos = 12
+        while pos < len(data) and data[pos] != 0:
+            pos += data[pos] + 1
+        pos += 1
+        qtype = struct.unpack(">H", data[pos:pos + 2])[0] if pos + 2 <= len(data) else 0
+        _log(
+            "query",
+            proto=proto,
+            src=src_addr[0],
+            src_port=src_addr[1],
+            name=name,
+            qtype=qtype,
+        )
+    except Exception as e:
+        _log("raw_packet", proto=proto, src=src_addr[0], data=data[:64].hex(), error=str(e))
+
+
+class LLMNRProtocol(asyncio.DatagramProtocol):
+    def __init__(self, proto_label: str):
+        self._proto = proto_label
+
+    def datagram_received(self, data, addr):
+        _parse_query(data, self._proto, addr)
+
+    def error_received(self, exc):
+        pass
+
+
+async def main():
+    _log("startup", msg=f"LLMNR/mDNS server starting as {NODE_NAME}")
+    loop = asyncio.get_running_loop()
+
+    # LLMNR: UDP 5355
+    llmnr_transport, _ = await loop.create_datagram_endpoint(
+        lambda: LLMNRProtocol("LLMNR"),
+        local_addr=("0.0.0.0", 5355),
+    )
+    # mDNS: UDP 5353
+    mdns_transport, _ = await loop.create_datagram_endpoint(
+        lambda: LLMNRProtocol("mDNS"),
+        local_addr=("0.0.0.0", 5353),
+    )
+
+    try:
+        await asyncio.sleep(float("inf"))
+    finally:
+        llmnr_transport.close()
+        mdns_transport.close()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())