fix(packaging): move templates/ into decnet/ package so they ship with pip install

The docker build contexts and syslog_bridge.py lived at repo root, which
meant setuptools (include = ["decnet*"]) never shipped them. Agents
installed via `pip install $RELEASE_DIR` got site-packages/decnet/** but no
templates/, so every deploy blew up in deployer._sync_logging_helper with
FileNotFoundError on templates/syslog_bridge.py.

Move templates/ -> decnet/templates/ and declare it as setuptools
package-data. Path resolutions in services/*.py and engine/deployer.py drop
one .parent since templates now lives beside the code. Test fixtures,
bandit exclude path, and coverage omit glob updated to match.

decnet/templates/mssql/Dockerfile

@@ -0,0 +1,23 @@
+ARG BASE_IMAGE=debian:bookworm-slim
+FROM ${BASE_IMAGE}
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    python3 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY syslog_bridge.py /opt/syslog_bridge.py
+COPY server.py /opt/server.py
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+EXPOSE 1433
+RUN useradd -r -s /bin/false -d /opt logrelay \
+ && apt-get update && apt-get install -y --no-install-recommends libcap2-bin \
+ && rm -rf /var/lib/apt/lists/* \
+ && (find /usr/bin/ -maxdepth 1 -name 'python3*' -type f -exec setcap 'cap_net_bind_service+eip' {} \; 2>/dev/null || true)
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD kill -0 1 || exit 1
+
+USER logrelay
+ENTRYPOINT ["/entrypoint.sh"]

decnet/templates/mssql/entrypoint.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+set -e
+exec python3 /opt/server.py

decnet/templates/mssql/server.py

@@ -0,0 +1,143 @@
+#!/usr/bin/env python3
+"""
+MSSQL (TDS)server.
+Reads TDS pre-login and login7 packets, extracts username, responds with
+a login failed error. Logs auth attempts as JSON.
+"""
+
+import asyncio
+import os
+import struct
+from syslog_bridge import syslog_line, write_syslog_file, forward_syslog
+
+NODE_NAME = os.environ.get("NODE_NAME", "dbserver")
+SERVICE_NAME   = "mssql"
+LOG_TARGET = os.environ.get("LOG_TARGET", "")
+
+_PRELOGIN_RESP = bytes([
+    0x04, 0x01, 0x00, 0x2f, 0x00, 0x00, 0x01, 0x00,  # TDS header type=4, status=1, len=47
+    # 0. VERSION option
+    0x00, 0x00, 0x1a, 0x00, 0x06,
+    # 1. ENCRYPTION option
+    0x01, 0x00, 0x20, 0x00, 0x01,
+    # 2. INSTOPT
+    0x02, 0x00, 0x21, 0x00, 0x01,
+    # 3. THREADID
+    0x03, 0x00, 0x22, 0x00, 0x04,
+    # 4. MARS
+    0x04, 0x00, 0x26, 0x00, 0x01,
+    # TERMINATOR
+    0xff,
+    # version data: 14.0.2000
+    0x0e, 0x00, 0x07, 0xd0, 0x00, 0x00,
+    # encryption: NOT_SUP
+    0x02,
+    # instopt
+    0x00,
+    # thread id
+    0x00, 0x00, 0x00, 0x00,
+    # mars
+    0x00,
+])
+
+
+
+
+def _log(event_type: str, severity: int = 6, **kwargs) -> None:
+    line = syslog_line(SERVICE_NAME, NODE_NAME, event_type, severity, **kwargs)
+    write_syslog_file(line)
+    forward_syslog(line, LOG_TARGET)
+
+
+def _tds_error_packet(message: str) -> bytes:
+    msg_enc = message.encode("utf-16-le")
+    # Token type 0xAA = ERROR, followed by length, error number, state, class, msg_len, msg
+    token = (
+        b"\xaa"
+        + struct.pack("<H", 4 + 1 + 1 + 2 + len(msg_enc) + 1 + 1 + 1 + 1 + 4)
+        + struct.pack("<I", 18456)   # SQL error number: login failed
+        + b"\x01"                    # state
+        + b"\x0e"                    # class
+        + struct.pack("<H", len(message))
+        + msg_enc
+        + b"\x00"                    # server name length
+        + b"\x00"                    # proc name length
+        + struct.pack("<I", 1)       # line number
+    )
+    done = b"\xfd\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
+    payload = token + done
+    header = struct.pack(">BBHBBBB", 0x04, 0x01, len(payload) + 8, 0x00, 0x00, 0x01, 0x00)
+    return header + payload
+
+
+class MSSQLProtocol(asyncio.Protocol):
+    def __init__(self):
+        self._transport = None
+        self._peer = None
+        self._buf = b""
+        self._prelogin_done = False
+
+    def connection_made(self, transport):
+        self._transport = transport
+        self._peer = transport.get_extra_info("peername", ("?", 0))
+        _log("connect", src=self._peer[0], src_port=self._peer[1])
+
+    def data_received(self, data):
+        self._buf += data
+        while len(self._buf) >= 8:
+            pkt_type = self._buf[0]
+            pkt_len = struct.unpack(">H", self._buf[2:4])[0]
+            if pkt_len < 8:
+                _log("unknown_packet", src=self._peer[0], pkt_type=hex(pkt_type))
+                self._transport.close()
+                self._buf = b""
+                return
+            if len(self._buf) < pkt_len:
+                break
+            payload = self._buf[8:pkt_len]
+            self._buf = self._buf[pkt_len:]
+            self._handle_packet(pkt_type, payload)
+            if self._transport.is_closing():
+                self._buf = b""
+                break
+
+    def _handle_packet(self, pkt_type: int, payload: bytes):
+        if pkt_type == 0x12:  # Pre-login
+            self._transport.write(_PRELOGIN_RESP)
+            self._prelogin_done = True
+        elif pkt_type == 0x10:  # Login7
+            username = self._parse_login7_username(payload)
+            _log("auth", src=self._peer[0], username=username)
+            self._transport.write(_tds_error_packet("Login failed for user."))
+            self._transport.close()
+        else:
+            _log("unknown_packet", src=self._peer[0], pkt_type=hex(pkt_type))
+            self._transport.close()
+
+    def _parse_login7_username(self, payload: bytes) -> str:
+        try:
+            # Login7 layout: fixed header 36 bytes, then offsets
+            # Username offset at bytes 36-37, length at 38-39
+            if len(payload) < 40:
+                return "<short_packet>"
+            offset = struct.unpack("<H", payload[36:38])[0]
+            length = struct.unpack("<H", payload[38:40])[0]
+            username = payload[offset:offset + length * 2].decode("utf-16-le", errors="replace")
+            return username
+        except Exception:
+            return "<parse_error>"
+
+    def connection_lost(self, exc):
+        _log("disconnect", src=self._peer[0] if self._peer else "?")
+
+
+async def main():
+    _log("startup", msg=f"MSSQL server starting as {NODE_NAME}")
+    loop = asyncio.get_running_loop()
+    server = await loop.create_server(MSSQLProtocol, "0.0.0.0", 1433)  # nosec B104
+    async with server:
+        await server.serve_forever()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

decnet/templates/mssql/syslog_bridge.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+"""
+Shared RFC 5424 syslog helper used by service containers.
+
+Services call syslog_line() to format an RFC 5424 message, then
+write_syslog_file() to emit it to stdout — the container runtime
+captures it, and the host-side collector streams it into the log file.
+
+RFC 5424 structure:
+  <PRI>1 TIMESTAMP HOSTNAME APP-NAME PROCID MSGID [SD-ELEMENT] MSG
+
+Facility: local0 (16). SD element ID uses PEN 55555.
+"""
+
+from datetime import datetime, timezone
+from typing import Any
+
+# ─── Constants ────────────────────────────────────────────────────────────────
+
+_FACILITY_LOCAL0 = 16
+_SD_ID = "relay@55555"
+_NILVALUE = "-"
+
+SEVERITY_EMERG   = 0
+SEVERITY_ALERT   = 1
+SEVERITY_CRIT    = 2
+SEVERITY_ERROR   = 3
+SEVERITY_WARNING = 4
+SEVERITY_NOTICE  = 5
+SEVERITY_INFO    = 6
+SEVERITY_DEBUG   = 7
+
+_MAX_HOSTNAME = 255
+_MAX_APPNAME  = 48
+_MAX_MSGID    = 32
+
+# ─── Formatter ────────────────────────────────────────────────────────────────
+
+def _sd_escape(value: str) -> str:
+    """Escape SD-PARAM-VALUE per RFC 5424 §6.3.3."""
+    return value.replace("\\", "\\\\").replace('"', '\\"').replace("]", "\\]")
+
+
+def _sd_element(fields: dict[str, Any]) -> str:
+    if not fields:
+        return _NILVALUE
+    params = " ".join(f'{k}="{_sd_escape(str(v))}"' for k, v in fields.items())
+    return f"[{_SD_ID} {params}]"
+
+
+def syslog_line(
+    service: str,
+    hostname: str,
+    event_type: str,
+    severity: int = SEVERITY_INFO,
+    timestamp: datetime | None = None,
+    msg: str | None = None,
+    **fields: Any,
+) -> str:
+    """
+    Return a single RFC 5424-compliant syslog line (no trailing newline).
+
+    Args:
+        service:    APP-NAME (e.g. "http", "mysql")
+        hostname:   HOSTNAME (node name)
+        event_type: MSGID    (e.g. "request", "login_attempt")
+        severity:   Syslog severity integer (default: INFO=6)
+        timestamp:  UTC datetime; defaults to now
+        msg:        Optional free-text MSG
+        **fields:   Encoded as structured data params
+    """
+    pri     = f"<{_FACILITY_LOCAL0 * 8 + severity}>"
+    ts      = (timestamp or datetime.now(timezone.utc)).isoformat()
+    host    = (hostname or _NILVALUE)[:_MAX_HOSTNAME]
+    appname = (service  or _NILVALUE)[:_MAX_APPNAME]
+    msgid   = (event_type or _NILVALUE)[:_MAX_MSGID]
+    sd      = _sd_element(fields)
+    message = f" {msg}" if msg else ""
+    return f"{pri}1 {ts} {host} {appname} {_NILVALUE} {msgid} {sd}{message}"
+
+
+def write_syslog_file(line: str) -> None:
+    """Emit a syslog line to stdout for container log capture."""
+    print(line, flush=True)
+
+
+def forward_syslog(line: str, log_target: str) -> None:
+    """No-op stub. TCP forwarding is handled by rsyslog, not by service containers."""
+    pass