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/sip/Dockerfile

@@ -0,0 +1,24 @@
+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 5060/udp
+EXPOSE 5060/tcp
+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/sip/entrypoint.sh

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

decnet/templates/sip/server.py

@@ -0,0 +1,135 @@
+#!/usr/bin/env python3
+"""
+SIP server (UDP + TCP port 5060).
+Parses SIP REGISTER and INVITE messages, logs credentials from the
+Authorization header and call metadata, then responds with 401 Unauthorized.
+"""
+
+import asyncio
+import os
+import re
+from syslog_bridge import syslog_line, write_syslog_file, forward_syslog
+
+NODE_NAME = os.environ.get("NODE_NAME", "pbx")
+SERVICE_NAME   = "sip"
+LOG_TARGET = os.environ.get("LOG_TARGET", "")
+
+_401 = (
+    "SIP/2.0 401 Unauthorized\r\n"
+    "Via: {via}\r\n"
+    "From: {from_}\r\n"
+    "To: {to}\r\n"
+    "Call-ID: {call_id}\r\n"
+    "CSeq: {cseq}\r\n"
+    'WWW-Authenticate: Digest realm="{host}", nonce="{nonce}", algorithm=MD5\r\n'
+    "Content-Length: 0\r\n\r\n"
+)
+
+
+
+
+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 _parse_headers(msg: str) -> dict:
+    headers = {}
+    for line in msg.splitlines()[1:]:
+        if ":" in line:
+            k, _, v = line.partition(":")
+            headers[k.strip().lower()] = v.strip()
+    return headers
+
+
+def _handle_message(data: bytes, src_addr) -> bytes | None:
+    try:
+        msg = data.decode(errors="replace")
+    except Exception:
+        return None
+    first_line = msg.splitlines()[0] if msg else ""
+    method = first_line.split()[0] if first_line else "UNKNOWN"
+    headers = _parse_headers(msg)
+
+    auth_header = headers.get("authorization", "")
+    username = ""
+    if auth_header:
+        m = re.search(r'username="([^"]+)"', auth_header)
+        username = m.group(1) if m else ""
+
+    _log(
+        "request",
+        src=src_addr[0],
+        src_port=src_addr[1],
+        method=method,
+        from_=headers.get("from", ""),
+        to=headers.get("to", ""),
+        username=username,
+        auth=auth_header[:256],
+    )
+
+    if method in ("REGISTER", "INVITE", "OPTIONS"):
+        nonce = os.urandom(8).hex()
+        response = _401.format(
+            via=headers.get("via", ""),
+            from_=headers.get("from", ""),
+            to=headers.get("to", ""),
+            call_id=headers.get("call-id", ""),
+            cseq=headers.get("cseq", ""),
+            host=NODE_NAME,
+            nonce=nonce,
+        )
+        return response.encode()
+    return None
+
+
+class SIPUDPProtocol(asyncio.DatagramProtocol):
+    def __init__(self):
+        self._transport = None
+
+    def connection_made(self, transport):
+        self._transport = transport
+
+    def datagram_received(self, data, addr):
+        response = _handle_message(data, addr)
+        if response and self._transport:
+            self._transport.sendto(response, addr)
+
+
+class SIPTCPProtocol(asyncio.Protocol):
+    def __init__(self):
+        self._transport = None
+        self._peer = None
+        self._buf = b""
+
+    def connection_made(self, transport):
+        self._transport = transport
+        self._peer = transport.get_extra_info("peername", ("?", 0))
+
+    def data_received(self, data):
+        self._buf += data
+        if b"\r\n\r\n" in self._buf or b"\n\n" in self._buf:
+            response = _handle_message(self._buf, self._peer)
+            self._buf = b""
+            if response:
+                self._transport.write(response)
+
+    def connection_lost(self, exc):
+        pass
+
+
+async def main():
+    _log("startup", msg=f"SIP server starting as {NODE_NAME}")
+    loop = asyncio.get_running_loop()
+    udp_transport, _ = await loop.create_datagram_endpoint(
+        SIPUDPProtocol, local_addr=("0.0.0.0", 5060)  # nosec B104
+    )
+    tcp_server = await loop.create_server(SIPTCPProtocol, "0.0.0.0", 5060)  # nosec B104
+    async with tcp_server:
+        await tcp_server.serve_forever()
+    udp_transport.close()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

decnet/templates/sip/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