feat: initial commit

backend/app/dnslog.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+import asyncio
+import os
+import re
+from datetime import datetime, timezone
+
+from .state import NetworkState
+
+# dnsmasq style: "query[A] example.com from 192.168.88.10"
+DNS_QUERY_RE = re.compile(r"query\[[^\]]+\]\s+(?P<qname>\S+)\s+from\s+(?P<src_ip>\d+\.\d+\.\d+\.\d+)")
+
+
+async def tail_dns_log(state: NetworkState, path: str) -> None:
+    if not path:
+        return
+    if not os.path.isfile(path):
+        return
+
+    with open(path, "r", encoding="utf-8", errors="ignore") as f:
+        f.seek(0, os.SEEK_END)
+        while True:
+            line = f.readline()
+            if not line:
+                await asyncio.sleep(0.5)
+                continue
+
+            m = DNS_QUERY_RE.search(line)
+            if not m:
+                continue
+            src_ip = m.group("src_ip")
+            qname = m.group("qname")
+            await state.add_dns_event(src_ip=src_ip, qname=qname, answers=[], ts=datetime.now(timezone.utc))