Build Housecarl 0.1.0: the nftables firewall manager

Zones, address sets (IPv4 and IPv6 mixed, dynamic sets with timeouts) and
services, ordered rules in the early, input, forward and output chains,
port forwards with hairpin NAT and IPv6 pinholes, source NAT, redirects,
and switchable built-ins (loopback, conntrack, ICMPv6, antispoofing, MSS
clamping, DHCPv6 client, flowtable). Every change is validated, checked
with nft -c and applied in one transaction to Housecarl's own table,
inet housecarl; changes made over the network roll back unless
confirmed, and the confirmed ruleset is loaded at boot by
housecarl-ruleset.service. An empty configuration applies nothing.

Also: hit counters and the drop log (nflog), 'hc import' of an existing
nftables ruleset and 'hc takeover', the hc CLI, the REST API and the web
UI, users, scoped tokens (sets:write:NAME), the audit log, the web UI's
certificate through Jarl, Debian packages, docs, unit tests with real
nft 1.1.3, and an e2e test with real traffic (71 checks).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/web/static/assets/pages/log.js

@@ -0,0 +1,34 @@
+// The log: packets rules (with logging on) and the policies logged,
+// refreshed every few seconds.
+import { h, mount, input, debounce } from "../ui.js";
+import { get } from "../api.js";
+import { onLeave } from "../app.js";
+
+export async function render(el, params, query) {
+  const search = input({ type: "search", placeholder: "address, interface, rule…", value: query.get("q") || "" });
+  const out = h("div");
+  let live = true;
+  const pause = h("button", { onclick: () => { live = !live; pause.textContent = live ? "Pause" : "Resume"; } }, "Pause");
+  const addr = (a, port) => port ? (a.includes(":") ? "[" + a + "]:" + port : a + ":" + port) : a;
+  const draw = async () => {
+    const es = await get("/log", { limit: 300, q: search.value.trim() });
+    mount(out, es.length ? h("div", { class: "table-wrap" }, h("table", { class: "activity" },
+      h("thead", null, h("tr", null, ["Time", "Why", "In", "Out", "From", "To", "Protocol"].map((t) => h("th", null, t)))),
+      h("tbody", null, es.map((e) => h("tr", null,
+        h("td", { class: "mono small" }, new Date(e.time).toLocaleTimeString(undefined, { hourCycle: "h23" })),
+        h("td", null, e.mark && e.mark.startsWith("r") ? h("a", { href: "#/rules", title: "rule " + e.mark.slice(1) }, e.prefix) : e.prefix),
+        h("td", { class: "mono" }, e.in || ""), h("td", { class: "mono" }, e.out || ""),
+        h("td", { class: "mono" }, addr(e.source, e.source_port)), h("td", { class: "mono" }, addr(e.destination, e.destination_port)),
+        h("td", null, e.protocol, e.icmp_type ? " " + e.icmp_type : "", e.tcp_flags ? h("span", { class: "muted small" }, " " + e.tcp_flags) : null)))))) :
+      h("div", { class: "empty" }, "Nothing logged yet. Turn logging on for a rule (Edit → Log), or for what the policies drop (Settings)."));
+  };
+  search.addEventListener("input", debounce(draw, 300));
+  mount(el,
+    h("div", { class: "page-head" }, h("div", { class: "grow" }, h("h1", null, "Log"),
+      h("div", { class: "muted" }, "Packets logged by rules and policies, newest first (the last 2000 are kept)."))),
+    h("div", { class: "filter-row" }, search, pause),
+    h("div", { class: "panel" }, out));
+  await draw();
+  const t = setInterval(() => { if (live && !document.hidden) draw().catch(() => {}); }, 3000);
+  onLeave(() => clearInterval(t));
+}