Add blocking: blocklists and block/allow rules with BIND response policy zones

jarld downloads blocklists (Adblock, hosts or plain domains), checks them
daily and reloads named only when a list changed; your own block and
allow rules take precedence, and the most specific rule wins. Lists and
rules apply per view (default: every view that offers recursion). Web UI
Blocking page with name checks, jarl blocklist and jarl block, the
/blocking API, blocked counts in the statistics. Database schema 6.

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

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

@@ -56,7 +56,8 @@ export async function render(el, params, query) {
     tile("Per second", s.avg_qps < 10 ? s.avg_qps.toFixed(2) : Math.round(s.avg_qps).toLocaleString(), "on average"),
     s.peak ? tile("Busiest " + s.peak.per, compact(s.peak.queries), fmtTime(s.peak.time)) : null,
     s.nxdomain_ratio != null ? tile("NXDOMAIN", pct(s.nxdomain_ratio), "of queries named no existing name") : null,
-    s.cache_hit_ratio != null ? tile("Cache hits", pct(s.cache_hit_ratio), "of recursive queries answered from cache") : null));
+    s.cache_hit_ratio != null ? tile("Cache hits", pct(s.cache_hit_ratio), "of recursive queries answered from cache") : null,
+    s.blocked_ratio != null ? tile("Blocked", pct(s.blocked_ratio), compact(s.blocked) + " queries, by your rules and blocklists") : null));
 
   // Volume over time: one series, so no legend box; the title names it.
   const q = timeline.series.find((x) => x.key === "queries") || { values: timeline.times.map(() => 0) };
@@ -84,7 +85,8 @@ export async function render(el, params, query) {
       listCard("Busiest clients", "", barList(t.client)),
       listCard("Names that don't exist", "NXDOMAIN answers: typos, removed hosts, misconfigured clients, malware", barList(t.nxdomain, { empty: "None " + rangeLabel + "." })),
       listCard("Refused clients", "clients asking for something they may not have (often internet scanners)", barList(t.refused, { empty: "None " + rangeLabel + "." })),
-      t.servfail.length ? listCard("Names that failed to resolve", "SERVFAIL answers", barList(t.servfail)) : null));
+      t.servfail.length ? listCard("Names that failed to resolve", "SERVFAIL answers", barList(t.servfail)) : null,
+      t.blocked.length ? listCard("Most blocked names", "answered \"doesn't exist\" by blocking; click a name to see why, or to allow it", barList(t.blocked, { href: (k) => "#/blocking?check=" + encodeURIComponent(k) })) : null));
   } else {
     parts.push(h("div", { class: "msg info" }, "Top names and clients need the response log: set stats.query_log: true in /etc/jarl/jarl.yaml and restart jarl."));
   }
@@ -98,7 +100,8 @@ export async function render(el, params, query) {
     b.view.length > 1 || (b.view.length === 1 && b.view[0].key !== "_default") ? listCard("Views", "", barList(b.view, { label: viewLabel })) : null,
     b.zone.length ? listCard("Zones", "queries per local zone; other = names in no local zone (recursion)", barList(b.zone, { label: (k) => (k === "-" ? "other" : k), href: (k) => (k === "-" ? null : "#/search?q=" + encodeURIComponent(k)) })) : null,
     b.answer.length ? listCard("Answers", "authoritative (your zones) or recursive (from the cache or the internet)", barList(b.answer)) : null,
-    rtt.length ? listCard("Upstream response time", "how long other servers took to answer named's recursive queries", barList(rtt)) : null));
+    rtt.length ? listCard("Upstream response time", "how long other servers took to answer named's recursive queries", barList(rtt)) : null,
+    b.blocklist.length ? listCard("Blocked by", "which of your rules and blocklists blocked queries", barList(b.blocklist, { label: (k) => (k === "rules" ? "your rules" : k), href: () => "#/blocking" })) : null));
   el.classList.remove("refreshing");
   mount(el, parts);
   scheduleRefresh(el, params, query, gen);
@@ -111,10 +114,10 @@ async function loadAll(since, heatSince, queryLog) {
     errors: get("/stats/timeline", { since, key: failures.map((f) => f.key).join(",") }),
     heat: get("/stats/heatmap", { since: heatSince }),
   };
-  const groups = ["qtype", "rcode", "view", "zone", "answer", "rtt"];
+  const groups = ["qtype", "rcode", "view", "zone", "answer", "rtt", "blocklist"];
   groups.forEach((g) => { p["b_" + g] = get("/stats/breakdown", { group: g, since }); });
   if (queryLog) {
-    for (const k of ["name", "client", "nxdomain", "refused", "servfail"]) p["t_" + k] = get("/stats/top", { kind: k, since, limit: 15 });
+    for (const k of ["name", "client", "nxdomain", "refused", "servfail", "blocked"]) p["t_" + k] = get("/stats/top", { kind: k, since, limit: 15 });
   }
   const keys = Object.keys(p);
   const vals = await Promise.all(Object.values(p));