Release 0.5.2

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

.gitignore

@@ -3,3 +3,5 @@
 *.db
 *.db-wal
 *.db-shm
+/jarl
+/jarld

CHANGELOG.md

@@ -6,8 +6,73 @@ All notable changes to Jarl are documented here. The format follows
 
 ## [Unreleased]
 
+## [0.5.2] - 2026-10-12
+
+### Added
+
+- Mail reverse DNS check: the addresses of the public zones' MX hosts and
+  SPF records are looked up as the internet sees them, every 6 hours: a
+  PTR record whose name resolves back to the address, which Gmail and
+  Outlook require. It says who runs the reverse zone (your provider) and
+  what to set there, and notes when Jarl has its own reverse zone for the
+  address, which only your clients see. The Exposure page (Check now),
+  `jarl exposure mail` and Prometheus `jarl_mail_reverse_dns_ok`.
+- Added by Jarl: the Server options page, `jarl option generated` and
+  `GET /options/generated` list what Jarl writes into named.conf by
+  itself (keys.conf, the statistics channel and logging, blocking's
+  response-policy, the view keys), why, and what controls each.
+- `stats.rate_limit_log` (default true): `false` stops Jarl adding named's
+  `query-errors` category to its log channel when rate limiting is set.
+
+### Changed
+
+- Option values with a list of three or more elements (allow-query,
+  forwarders, listen-on, ...) are shown one element per line.
+
+## [0.5.1] - 2026-10-12
+
+### Added
+
+- Encrypted DNS health: jarld checks the DoT and DoH listeners every 10
+  minutes as a client would (the certificate is for the host name,
+  current and the one Jarl last wrote; a question gets an answer) and
+  says what is wrong: nothing listening, a firewall, the wrong or an
+  older certificate. On the Encrypted DNS page (Check now), the
+  dashboard, `jarl encrypted-dns health` and Prometheus
+  `jarl_encrypted_dns_up`.
+- Comparing a zone's views: the Compare views tab and `jarl zone diff`
+  show the names and types that differ between the views that have a
+  zone, linked or not, with "Use this version" to share one view's
+  version. `GET /zones/{zone}/compare`.
+
+### Changed
+
+- `--local` (and `"local": true`) works on zones that aren't linked too:
+  their records are local anyway. `--shared` there is still refused.
+- When `certificates.dir` changes, jarld points the `tls` statements
+  encrypted DNS wrote at the new place when it starts; named kept the old
+  copies before, which renewals no longer updated.
+
+### Fixed
+
+- Sharing a view's version of a name that was shared already (Use this
+  version on the shared side) didn't replace another view's override; it
+  said there was nothing to do.
+
+## [0.5.0] - 2026-10-12
+
 ### Upgrading from 0.4
 
+- The database gets three new versions (internet exposure, certificates,
+  linked zones), applied when jarld starts; a 0.4 jarld can't open it
+  afterwards, so take a backup first (`sudo jarld backup`). Backups made
+  by 0.4 restore into this version. Tested: 0.4.0 packages with views,
+  zones, records, blocking and statistics, upgraded in place and
+  restored from a 0.4.0 backup.
+
+- Statistics per view start with this version: earlier figures are for
+  all views together.
+
 - New exposure warnings (docs/exposure.md) appear for views reachable from
   the internet, e.g. "no rate-limit" or "version visible" on an external
   view: fix them from the Exposure page, or acknowledge them. A change
@@ -18,8 +83,25 @@ All notable changes to Jarl are documented here. The format follows
   parser doesn't know them. Remove the ranges first if you need to
   downgrade.
 
+### Changed
+
+- The web UI's top bar had grown too long, and the user name, Users and
+  Log out ended up on a second line on the left. The server's
+  configuration and security pages (Server options, ACLs, TSIG keys,
+  Exposure, Certificates, Encrypted DNS, Audit log) are now in a
+  **Server** menu, and Account, Users and Log out in a menu under your
+  name. On narrow screens the search box and your name stay together on
+  the right.
+
 ### Fixed
 
+- "update PTR" when editing a record (`jarl record update ID --ptr`) did
+  nothing unless the name or address changed too, and the web UI didn't
+  even send it alone: a reverse zone created after the record never got
+  its PTR. Alone, it now adds the PTR record if it is missing (or enables
+  it). For records of linked zones, the reverse zones of every linked view
+  count, not only the record's own view.
+
 - Option values in the web UI looked different from the editor: a long
   line wrapped back to the left edge, losing its indentation, and the
   column changed width when Edit opened. Values now keep their layout
@@ -40,6 +122,13 @@ All notable changes to Jarl are documented here. The format follows
 
 ### Added
 
+- Statistics per view ([docs/stats.md](docs/stats.md#views)): the
+  Statistics page has a toggle per view, with All and None, remembered in
+  the browser, to see some views only or several together (linked views,
+  say). Answers, result codes, record types, zones, blocking, rate
+  limiting and the top lists follow it; named's own counters stay for the
+  whole server, and the page says so. `jarl stats --view`, API
+  `?views=`. Per-view figures start with this version.
 - DNS over TLS and HTTPS ([docs/encrypted-dns.md](docs/encrypted-dns.md)):
   `jarl encrypted-dns setup --hostname NAME --address ADDR` (and the
   Encrypted DNS page) obtains a certificate for the host name if needed,

README.md

@@ -200,11 +200,11 @@ review step.
 
 ## Status
 
-Version 0.4.0 is the current release, and 0.4.1 is in testing
-(0.4.1-rc.4): it adds Prometheus metrics, address ranges in ACLs and
-other address match lists, safer changeset handling, internet exposure
-checks with response rate limiting, TLS certificates Jarl obtains and
-renews itself, linked zones for split DNS, and DNS over TLS and HTTPS. 0.4.0 added blocking (blocklists and
+Version 0.5.2 is the current release. It adds Prometheus metrics,
+address ranges in ACLs and other address match lists, safer changeset
+handling, internet exposure checks with response rate limiting, TLS
+certificates Jarl obtains and renews itself, linked zones for split DNS,
+DNS over TLS and HTTPS, and statistics per view. 0.4.0 added blocking (blocklists and
 your own rules, like Pi-hole, done by named, with different blocking for
 different devices), disabling zones, server statistics and view keys, on
 top of 0.3.0's disabled records, script-friendly CLI output and client

VERSION

@@ -1 +1 @@
-0.4.1-rc.4
+0.5.2

cmd/jarl/config_cmds.go

@@ -721,7 +721,35 @@ func optionCmd() *cobra.Command {
 	}
 	scopeArgs(describe)
 	describe.Flags().StringVar(&zoneType, "zone-type", "primary", "with --zone: the zone type")
-	cmd.AddCommand(list, set, unset, describe)
+	generated := &cobra.Command{
+		Use:   "generated",
+		Short: "What Jarl adds to named.conf by itself, why, and what controls it",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newClient()
+			if err != nil {
+				return err
+			}
+			var gen []struct {
+				Where   string `json:"where"`
+				Text    string `json:"text"`
+				Why     string `json:"why"`
+				Setting string `json:"setting"`
+			}
+			if err := c.Get(ctx(), "/options/generated", nil, &gen); err != nil {
+				return err
+			}
+			return output(gen, func(w io.Writer) {
+				for i, g := range gen {
+					if i > 0 {
+						fmt.Fprintln(w)
+					}
+					fmt.Fprintf(w, "# %s: %s\n# controlled by: %s\n%s\n", g.Where, g.Why, g.Setting, g.Text)
+				}
+			})
+		},
+	}
+	cmd.AddCommand(list, set, unset, describe, generated)
 	return cmd
 }
 

cmd/jarl/encdns.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"net/url"
 	"strings"
+	"time"
 
 	"github.com/spf13/cobra"
 )
@@ -24,6 +25,7 @@ type encStatus struct {
 	DoT         []encEndpoint `json:"dot"`
 	DoH         []encEndpoint `json:"doh"`
 	Other       bool          `json:"other"`
+	Health      *encHealth    `json:"health"`
 	Addresses   []struct {
 		Address string `json:"address"`
 		Private bool   `json:"private"`
@@ -99,6 +101,9 @@ views.`,
 						fmt.Fprintf(w, "For DoH clients:\t%s   (Firefox, Chrome, Windows 11)\n", s.DoHURL)
 					}
 				}
+				if s.Enabled {
+					printHealth(w, s.Health)
+				}
 				if s.Other {
 					fmt.Fprintln(w, "Note:\tnamed has DoT or DoH listeners written by hand too; setup leaves them alone")
 				}
@@ -308,7 +313,38 @@ replaces the earlier setup.`,
 			return report(resp)
 		},
 	}
-	cmd.AddCommand(setup, check, disable)
+	health := &cobra.Command{
+		Use:   "health",
+		Short: "Check the DoT and DoH listeners now, as a client would",
+		Long: `Connects to each listener, checks the certificate it serves (for the
+host name, current, the one Jarl last wrote) and asks a question. jarld
+also does this every 10 minutes; the dashboard and Prometheus
+(jarl_encrypted_dns_up) show the result. Exits 1 when a listener doesn't
+work.`,
+		Args: cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newClient()
+			if err != nil {
+				return err
+			}
+			var h encHealth
+			if err := c.Do(ctx(), "POST", "/encrypted-dns/health", nil, map[string]any{}, &h); err != nil {
+				return err
+			}
+			if err := output(h, func(w io.Writer) { printHealth(w, &h) }); err != nil {
+				return err
+			}
+			ok := true
+			for _, p := range h.Probes {
+				ok = ok && p.OK
+			}
+			if !ok {
+				return errors.New("encrypted DNS isn't working everywhere")
+			}
+			return nil
+		},
+	}
+	cmd.AddCommand(setup, check, disable, health)
 	return cmd
 }
 
@@ -337,3 +373,37 @@ func contains(list []string, s string) bool {
 	}
 	return false
 }
+
+type encHealth struct {
+	Checked time.Time `json:"checked"`
+	Probes  []struct {
+		Kind    string `json:"kind"`
+		Address string `json:"address"`
+		Port    int    `json:"port"`
+		OK      bool   `json:"ok"`
+		Problem string `json:"problem"`
+		Warning string `json:"warning"`
+		RCode   string `json:"rcode"`
+		Ms      int64  `json:"ms"`
+	} `json:"probes"`
+}
+
+func printHealth(w io.Writer, h *encHealth) bool {
+	if h == nil {
+		fmt.Fprintln(w, "Health:\tnot checked yet (jarl encrypted-dns health)")
+		return true
+	}
+	ok := true
+	for _, p := range h.Probes {
+		kind := map[string]string{"dot": "DoT", "doh": "DoH"}[p.Kind]
+		state := fmt.Sprintf("working (%s in %d ms)", p.RCode, p.Ms)
+		if !p.OK {
+			state, ok = "NOT WORKING: "+p.Problem, false
+		} else if p.Warning != "" {
+			state += "; " + p.Warning
+		}
+		fmt.Fprintf(w, "%s %s port %d:\t%s\n", kind, p.Address, p.Port, state)
+	}
+	fmt.Fprintf(w, "Checked:\t%s\n", h.Checked.Local().Format("2006-01-02 15:04:05"))
+	return ok
+}

cmd/jarl/exposure.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"strings"
@@ -42,6 +43,54 @@ type exposureReport struct {
 			Count int64
 		} `json:"names"`
 	} `json:"rate_limiting"`
+	Mail *mailReport `json:"mail"`
+}
+
+type mailReport struct {
+	Checked string `json:"checked"`
+	Results []struct {
+		Zone      string   `json:"zone"`
+		Address   string   `json:"address"`
+		Roles     []string `json:"roles"`
+		PTR       []string `json:"ptr"`
+		OK        bool     `json:"ok"`
+		Level     string   `json:"level"`
+		Message   string   `json:"message"`
+		ManagedBy string   `json:"managed_by"`
+		LocalZone string   `json:"local_zone"`
+	} `json:"results"`
+	Errors []string `json:"errors"`
+}
+
+func printMail(w io.Writer, m *mailReport) {
+	if len(m.Results) == 0 && len(m.Errors) == 0 {
+		fmt.Fprintln(w, "No mail addresses: no public zone has an MX record or SPF addresses.")
+		return
+	}
+	fmt.Fprintln(w, "ZONE\tADDRESS\tFOR\tPTR\tSTATUS")
+	for _, r := range m.Results {
+		ptr := strings.Join(r.PTR, ",")
+		if ptr == "" {
+			ptr = "-"
+		}
+		fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\n", r.Zone, r.Address, strings.Join(r.Roles, ", "), ptr, r.Level)
+		if r.Level != "ok" {
+			fmt.Fprintf(w, "  %s\n", r.Message)
+		}
+		if r.LocalZone != "" {
+			fmt.Fprintf(w, "  Jarl's reverse zone %s only answers inside: receivers ask %s\n", r.LocalZone, orOwner(r.ManagedBy))
+		}
+	}
+	for _, e := range m.Errors {
+		fmt.Fprintf(w, "error: %s\n", e)
+	}
+}
+
+func orOwner(s string) string {
+	if s == "" {
+		return "the address's owner"
+	}
+	return s
 }
 
 // exposureScope turns "server" (or "") into the server, anything else
@@ -115,6 +164,10 @@ fix Jarl can stage for each.`,
 						}
 					}
 				}
+				if r.Mail != nil {
+					fmt.Fprintln(w, "\nMAIL REVERSE DNS")
+					printMail(w, r.Mail)
+				}
 				if a := r.RateLimiting; a != nil && len(a.Counts) > 0 {
 					fmt.Fprintf(w, "\nRATE LIMITING, LAST %s\n", a.Since)
 					for _, e := range a.Counts {
@@ -186,6 +239,33 @@ fix Jarl can stage for each.`,
 			return report(resp)
 		},
 	}
-	cmd.AddCommand(fix, ack, unack)
+	mail := &cobra.Command{
+		Use:   "mail",
+		Short: "Check the reverse DNS of the addresses that send and receive your mail, now",
+		Long: `Finds the addresses of the public zones' MX hosts and SPF records and checks,
+through public resolvers, that each has a PTR record whose name resolves
+back to it, as Gmail and Outlook do. Exits 1 when one doesn't.`,
+		Args: cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newClient()
+			if err != nil {
+				return err
+			}
+			var m mailReport
+			if err := c.Do(ctx(), "POST", "/exposure/mail", nil, map[string]any{}, &m); err != nil {
+				return err
+			}
+			if err := output(m, func(w io.Writer) { printMail(w, &m) }); err != nil {
+				return err
+			}
+			for _, r := range m.Results {
+				if !r.OK {
+					return errors.New("some mail addresses have no working reverse DNS")
+				}
+			}
+			return nil
+		},
+	}
+	cmd.AddCommand(fix, ack, unack, mail)
 	return cmd
 }

cmd/jarl/stats.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io"
 	"math"
+	"net/url"
 	"slices"
 	"strconv"
 	"strings"
@@ -21,8 +22,22 @@ func statsCmd() *cobra.Command {
 		Long: `Query statistics collected from named (see docs/stats.md). They must be
 enabled in /etc/jarl/jarl.yaml (stats.enabled: true).
 
-Ranges are given with --since: 90m, 24h, 7d, 2w. Use -o json or -o yaml to
-export the data.`,
+Ranges are given with --since: 90m, 24h, 7d, 2w. --view limits the figures
+to some views (repeat it, or separate with commas): answers from named's
+response log, per view; named's own counters stay for the whole server.
+Use -o json or -o yaml to export the data.`,
+	}
+	var statsViews []string
+	cmd.PersistentFlags().StringSliceVar(&statsViews, "view", nil, "only these views (repeat, or comma separated)")
+	// withViews adds the --view filter to a query.
+	withViews := func(v url.Values) url.Values {
+		if len(statsViews) > 0 {
+			if v == nil {
+				v = url.Values{}
+			}
+			v.Set("views", strings.Join(statsViews, ","))
+		}
+		return v
 	}
 	// Each command has its own --since variable: their defaults differ, and
 	// a shared variable would take the last default for all of them.
@@ -77,14 +92,27 @@ export the data.`,
 				return err
 			}
 			var s stats.Summary
-			if err := c.Get(ctx(), "/stats/summary", q("since", summarySince, "top", strconv.Itoa(topN)), &s); err != nil {
+			if err := c.Get(ctx(), "/stats/summary", withViews(q("since", summarySince, "top", strconv.Itoa(topN))), &s); err != nil {
 				return err
 			}
 			return output(s, func(w io.Writer) {
 				fmt.Fprintf(w, "Range:\t%s to %s\n", s.From.Local().Format("2006-01-02 15:04"), s.To.Local().Format("2006-01-02 15:04"))
-				fmt.Fprintf(w, "Queries:\t%d (%.2f per second on average)\n", s.Queries, s.AvgQPS)
+				if len(s.FilterViews) > 0 {
+					since := ""
+					if s.ViewsSince != nil {
+						since = ", per view since " + s.ViewsSince.Local().Format("2006-01-02 15:04")
+					}
+					fmt.Fprintf(w, "Views:\t%s (from the response log%s; named's own counters are left out)\n", strings.Join(s.FilterViews, ", "), since)
+					fmt.Fprintf(w, "Answers:\t%d (%.2f per second on average)\n", s.Queries, s.AvgQPS)
+				} else {
+					fmt.Fprintf(w, "Queries:\t%d (%.2f per second on average)\n", s.Queries, s.AvgQPS)
+				}
 				if s.Peak != nil {
-					fmt.Fprintf(w, "Busiest %s:\t%s with %d queries\n", s.Peak.Per, s.Peak.Time.Local().Format("2006-01-02 15:04"), s.Peak.Queries)
+					what := "queries"
+					if len(s.FilterViews) > 0 {
+						what = "answers"
+					}
+					fmt.Fprintf(w, "Busiest %s:\t%s with %d %s\n", s.Peak.Per, s.Peak.Time.Local().Format("2006-01-02 15:04"), s.Peak.Queries, what)
 				}
 				if s.CacheHitRatio != nil {
 					fmt.Fprintf(w, "Cache hit ratio:\t%.1f%%\n", *s.CacheHitRatio*100)
@@ -157,7 +185,7 @@ export the data.`,
 				return err
 			}
 			var es []stats.Entry
-			if err := c.Get(ctx(), "/stats/top", q("kind", kind, "since", topSince, "limit", strconv.Itoa(limit)), &es); err != nil {
+			if err := c.Get(ctx(), "/stats/top", withViews(q("kind", kind, "since", topSince, "limit", strconv.Itoa(limit))), &es); err != nil {
 				return err
 			}
 			return output(es, func(w io.Writer) {
@@ -207,7 +235,7 @@ export the data.`,
 				qv.Add("key", k)
 			}
 			var tl stats.Timeline
-			if err := c.Get(ctx(), "/stats/timeline", qv, &tl); err != nil {
+			if err := c.Get(ctx(), "/stats/timeline", withViews(qv), &tl); err != nil {
 				return err
 			}
 			return output(tl, func(w io.Writer) {
@@ -256,7 +284,7 @@ export the data.`,
 				return err
 			}
 			var hm stats.Heatmap
-			if err := c.Get(ctx(), "/stats/heatmap", q("since", heatmapSince, "key", hmKey), &hm); err != nil {
+			if err := c.Get(ctx(), "/stats/heatmap", withViews(q("since", heatmapSince, "key", hmKey)), &hm); err != nil {
 				return err
 			}
 			return output(hm, func(w io.Writer) {
@@ -308,7 +336,7 @@ export the data.`,
 				return err
 			}
 			var es []stats.Entry
-			if err := c.Get(ctx(), "/stats/breakdown", q("group", args[0], "since", breakdownSince), &es); err != nil {
+			if err := c.Get(ctx(), "/stats/breakdown", withViews(q("group", args[0], "since", breakdownSince)), &es); err != nil {
 				return err
 			}
 			return output(es, func(w io.Writer) {

cmd/jarl/zones.go

@@ -424,7 +424,7 @@ equal to the file: records not in the file are deleted.`,
 	importCmd.Flags().BoolVar(&replace, "replace", false, "delete records that are not in the file")
 	importCmd.Flags().BoolVar(&useSOA, "use-soa", false, "also take SOA timers and $TTL from the file")
 
-	cmd.AddCommand(list, show, create, update, del, toggle(true), toggle(false), fileCmd, importCmd, zoneSerialsCmd(), zoneDelegationCmd(), zoneDNSSECCmd(), zoneRegistrarCmd(), zoneLinkCmd(true), zoneLinkCmd(false))
+	cmd.AddCommand(list, show, create, update, del, toggle(true), toggle(false), fileCmd, importCmd, zoneSerialsCmd(), zoneDelegationCmd(), zoneDNSSECCmd(), zoneRegistrarCmd(), zoneLinkCmd(true), zoneLinkCmd(false), zoneDiffCmd())
 	return cmd
 }
 
@@ -937,3 +937,90 @@ zone is dissolved.`
 	cmd.Example = "  jarl zone unlink adbraun.lol --view vps"
 	return cmd
 }
+
+// zoneDiffCmd is 'zone diff': a zone's records side by side in the views
+// that have it.
+func zoneDiffCmd() *cobra.Command {
+	var views []string
+	var all bool
+	cmd := &cobra.Command{
+		Use:   "diff ZONE [--view V --view W] [--all]",
+		Short: "Show what differs between the views that have a zone",
+		Long: `Lines up a zone's records in the views that have it (or the views
+given), one row per name and type, and shows the ones that differ: a
+local override in a linked zone, a record one view lacks. With --all, the
+ones that are the same too. In a linked zone, 'jarl record update ID
+--shared' makes a view's version every view's.`,
+		Example: `  jarl zone diff adbraun.lol
+  jarl zone diff adbraun.lol --view internal --view external --all`,
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newClient()
+			if err != nil {
+				return err
+			}
+			path, qv := zonePath(args[0], "")
+			if len(views) > 0 {
+				qv.Set("views", strings.Join(views, ","))
+			}
+			if all {
+				qv.Set("all", "1")
+			}
+			var r struct {
+				Zone   string   `json:"zone"`
+				Views  []string `json:"views"`
+				Linked bool     `json:"linked"`
+				Same   int      `json:"same"`
+				Rows   []struct {
+					Name  string `json:"name"`
+					Type  string `json:"type"`
+					Same  bool   `json:"same"`
+					Views []struct {
+						Records []string `json:"records"`
+						IDs     []int64  `json:"ids"`
+						Linked  string   `json:"linked"`
+					} `json:"views"`
+				} `json:"rows"`
+			}
+			if err := c.Get(ctx(), path+"/compare", qv, &r); err != nil {
+				return err
+			}
+			return output(r, func(w io.Writer) {
+				head := []string{"NAME", "TYPE"}
+				for _, v := range r.Views {
+					head = append(head, strings.ToUpper(v))
+				}
+				fmt.Fprintln(w, strings.Join(head, "\t"))
+				for _, row := range r.Rows {
+					cols := []string{row.Name, row.Type}
+					for _, vs := range row.Views {
+						cell := "-"
+						if len(vs.Records) > 0 {
+							cell = strings.Join(vs.Records, ", ")
+							if vs.Linked == "local" {
+								cell += " [local, id " + fmt.Sprint(vs.IDs[0]) + "]"
+							}
+						}
+						cols = append(cols, cell)
+					}
+					fmt.Fprintln(w, strings.Join(cols, "\t"))
+				}
+				link := "not linked (jarl zone link " + r.Zone + ")"
+				if r.Linked {
+					link = "linked"
+				}
+				fmt.Fprintf(w, "\n%d names and types differ, %d are the same; %s\n", len(r.Rows)-boolCount(all, r.Same), r.Same, link)
+			})
+		},
+	}
+	cmd.Flags().StringArrayVar(&views, "view", nil, "a view to compare (repeat; default: every view with the zone)")
+	cmd.Flags().BoolVar(&all, "all", false, "also show what is the same everywhere")
+	return cmd
+}
+
+func boolCount(b bool, n int) int {
+	if b {
+		return n
+	}
+	return 0
+}

cmd/jarld/main.go

@@ -188,6 +188,7 @@ func renderExtras(cfg *config.Config) render.Extras {
 		h := &render.StatsHooks{Channel: netip.MustParseAddrPort(cfg.Stats.StatisticsChannel)}
 		if cfg.Stats.QueryLog {
 			h.LogFile, h.LogVersions, h.LogSize = cfg.Stats.LogFile, cfg.Stats.LogVersions, cfg.Stats.LogSize
+			h.NoRateLimitLog = !cfg.Stats.RateLimitLog
 		}
 		x.Stats = h
 	}
@@ -333,7 +334,9 @@ func serveCmd() *cobra.Command {
 				TOTPRequire: a.cfg.TOTP.Require, TOTPIssuer: a.cfg.TOTP.IssuerName(),
 				Metrics: server.Metrics{Enabled: a.cfg.Metrics.Enabled, Listen: a.cfg.Metrics.Listen,
 					Allow: a.cfg.Metrics.AllowPrefixes(), Token: a.cfg.Metrics.Token},
-				Certs: cm,
+				Certs:        cm,
+				Resolvers:    a.cfg.ACME.Resolvers,
+				RateLimitLog: a.cfg.Stats.Enabled && a.cfg.Stats.QueryLog && a.cfg.Stats.RateLimitLog,
 				HTTPReq: server.HTTPReq{
 					Enabled:           a.cfg.ACME.HTTPReq.Enabled,
 					AllowPlainHTTP:    !a.cfg.ACME.HTTPReq.RequireHTTPS,

docs/api.md

@@ -353,6 +353,7 @@ and `linked_with` (the other views).
 |--------|------|------|
 | POST | `/zones/{zone}/link` | `{"with": ["external"]}` (default: every view with that zone). Names and types that are the same everywhere become shared, the rest stay local |
 | POST | `/zones/{zone}/unlink` | Takes the zone out of its link; its records stay, all local |
+| GET | `/zones/{zone}/compare` | The zone across the views that have it (`?views=a,b`; `?all=1` also the same rows): `views`, `linked`, `same` (count) and `rows` (name, type, `same`, per view `records`, `ids`, `linked`). The zone may be named without a view |
 
 `POST /zones` takes `"link_with": "VIEW"` to create a zone linked with
 that view's zone of the same name.
@@ -469,7 +470,8 @@ listing with `?changeset=` marks them `pending`.
 
 | Method | Path | Body / query |
 |--------|------|--------------|
-| GET | `/options` | `?scope=options\|view\|zone\|toplevel&scope_id=ID` (none: everything you may see) |
+| GET | `/options` | `?scope=options\|view\|zone\|toplevel&scope_id=ID` (none: everything you may see). `formatted` lays out a block over several lines, a list of three or more one element per line |
+| GET | `/options/generated` | What Jarl adds to named.conf by itself: `where`, `text`, `why`, `setting` (what turns it on or off) |
 | POST | `/options` | `{"scope": "zone", "scope_id": 11, "name": "allow-transfer", "value": "{ key xfer; }", "comment": "", "position": 0}` |
 | GET / PATCH / DELETE | `/options/{id}` | |
 | GET / PATCH | `/settings` | `{"nameservers": [...], "rname": "...", "default_ttl": 3600, "refresh": ..., "retry": ..., "expire": ..., "negative_ttl": ..., "serial_policy": "date"}` |
@@ -539,6 +541,10 @@ in it and its records.
 
 ### Query statistics
 
+Every statistics endpoint below takes `views=internal,vps` to limit the
+figures to those views ([stats.md](stats.md#views)); a breakdown that only
+exists for the whole server then answers `400 not_per_view`.
+
 Needs `stats:read`. When statistics are disabled, every endpoint but
 `status` answers 404 `stats_disabled`. See [stats.md](stats.md).
 

docs/certificates.md

@@ -193,7 +193,10 @@ jarl option set listen-on 'port 853 tls dot { 10.0.10.5; }' --add
 ```
 
 A certificate named uses can't be deleted or lose its `dns` use until
-named no longer names its files.
+named no longer names its files. If you change `certificates.dir`, jarld
+writes the certificates to the new place when it starts and points the
+`tls` statements encrypted DNS wrote there (a hand-written `tls`
+statement you change yourself).
 
 ## A certificate you renew yourself
 

docs/cli.md

@@ -221,6 +221,7 @@ jarl zone unlink adbraun.lol --view vps
 jarl record add adbraun.lol nas A 10.0.10.20 --view internal --local   # this view only
 jarl record set adbraun.lol www A 10.0.10.5 --view internal --local    # override the shared www A here
 jarl record update 1234 --local | --shared
+jarl zone diff adbraun.lol [--view V --view W] [--all]                 # what differs between the views
 ```
 
 When a zone exists in several views, add `--view NAME` to commands that
@@ -307,7 +308,9 @@ adds the quotes and splits long values into 255-byte strings. In reverse zones t
 host name (a bare `nas` is refused, since it would mean
 `nas.0.10.10.in-addr.arpa.`). `--ptr`
 keeps the PTR record in the reverse zone in step (when that zone is managed
-by Jarl). Every record type BIND supports can be used. Jarl knows the
+by Jarl); `jarl record update ID --ptr` with nothing else adds the PTR record
+if it is missing, e.g. after creating the reverse zone. In linked zones, the
+reverse zones of every linked view count. Every record type BIND supports can be used. Jarl knows the
 syntax of the common ones and checks them strictly, and the rest are
 validated by parsing.
 
@@ -402,6 +405,7 @@ jarl exposure                                         # public views, findings,
 jarl exposure fix external exposure_rate_limit        # rate limiting, log-only first
 jarl exposure fix external exposure_rate_limit_log_only   # then start enforcing
 jarl exposure fix server exposure_version
+jarl exposure mail                                   # reverse DNS of the addresses that send and receive mail
 jarl exposure ack external security_open_resolver --reason "public resolver, monitored"
 jarl exposure unack external security_open_resolver
 jarl view update external --exposure public|private|auto
@@ -415,6 +419,7 @@ See [exposure.md](exposure.md).
 jarl encrypted-dns                                   # what is set up, what to give clients
 jarl encrypted-dns setup --hostname dns.adbraun.lol --address 10.0.10.5 [--address IPv6] [--doh-port 8443] [--no-doh]
 jarl encrypted-dns check --address 10.0.10.5 --doh-port 443
+jarl encrypted-dns health                            # check the listeners now, as a client would
 jarl encrypted-dns disable
 ```
 
@@ -472,6 +477,7 @@ jarl option set logging '{ channel q { file "/var/log/named/query.log" versions
 jarl option unset forwarders
 jarl option describe                          # every option allowed at this scope
 jarl option describe allow-query-cache        # grammar and ARM description
+jarl option generated                         # what Jarl adds to named.conf by itself, and why
 ```
 
 Options that end in a list (`allow-*`, `forwarders`, `listen-on`, ...) may
@@ -528,6 +534,9 @@ working.
 
 ## Query statistics
 
+`--view internal,vps` (or repeated) limits any `jarl stats` command to those
+views ([stats.md](stats.md#views)).
+
 ```sh
 jarl stats status
 jarl stats summary --since 7d

docs/concepts.md

@@ -48,6 +48,14 @@ overwritten. Jarl records a checksum of every file it writes and reports
 **drift** when a file changes behind its back. It then refuses to overwrite
 the file until you say so (`--force`, or `jarl resync --force`).
 
+Some of named.conf comes from Jarl itself rather than from your options:
+the include of keys.conf, the statistics channel and the logging
+statistics need, blocking's `response-policy` and policy zones, and the
+view keys at the front of each view's `match-clients`. The Server options
+page lists them under **Added by Jarl**, with why each is there and what
+turns it on or off (`jarl option generated`). Where you have a statement
+of your own (`logging`, `statistics-channels`), Jarl merges into it.
+
 Comments are part of the data model: zones, records, ACLs, views, keys and
 options can all carry a comment, and Jarl writes it into the generated file.
 Comments in imported zone files are kept.

docs/encrypted-dns.md

@@ -113,6 +113,31 @@ Clients check the certificate against the host name, so the name must
 resolve to this server for them: the setup adds it to your private views.
 Open the ports in the server's firewall for your own networks only.
 
+## Health
+
+jarld checks the listeners itself, a minute after it starts and then
+every 10 minutes, the way a client would: it connects to each, checks the
+certificate named serves (for the host name, current, and the one Jarl
+last wrote, so a renewal named hasn't reread shows up) and asks for the
+host name. The Encrypted DNS page shows the result per listener (**Check
+now** checks again), the dashboard a card and the problems, Prometheus
+`jarl_encrypted_dns_up{kind,address,port}`:
+
+```sh
+jarl encrypted-dns health        # check now; exit 1 when a listener doesn't work
+```
+
+What it can say:
+
+| | |
+|--|--|
+| nothing listens on ADDR port P | named couldn't bind the port: look in named's log (ports below 1024 need named to start as root, as the Debian service does) |
+| no answer within 5s | a firewall on the server |
+| a certificate for X, not HOST | named serves another certificate |
+| an older certificate | named hasn't reread the renewed files (`rndc reconfig`) |
+| not from a CA this server trusts (warning) | a staging or test CA: clients reject it unless they trust it |
+| REFUSED (warning) | it works, but this server's own address gets a view that doesn't answer for the host name |
+
 ## What Jarl checks
 
 * A `tls` statement whose files don't exist is an error
@@ -129,3 +154,4 @@ Open the ports in the server's firewall for your own networks only.
 | POST | `/encrypted-dns/check` | `{"addresses", "dot", "doh", "dot_port", "doh_port"}`: `conflicts` (address, port, what) and `free_doh_port` |
 | POST | `/encrypted-dns` | `{"hostname", "certificate", "addresses", "dot", "doh", "dot_port", "doh_port", "views"}`: staged or applied like any change; 409 while the certificate hasn't been obtained |
 | DELETE | `/encrypted-dns` | Turns it off |
+| POST | `/encrypted-dns/health` | Checks the listeners now: `checked`, `probes` (kind, address, port, `ok`, `problem`, `warning`, certificate names, expiry and serial, `trusted`, `rcode`, `ms`). `GET /encrypted-dns` has the last check as `health` |

docs/exposure.md

@@ -107,7 +107,10 @@ is only in its log (category `query-errors`). That is why the activity
 needs query statistics; without them, look at named's log for
 `would rate limit`. When rate limiting is configured and statistics are
 on, Jarl adds `query-errors` to its log channel (keeping named's syslog
-destination for it).
+destination for it). `stats.rate_limit_log: false` in jarl.yaml leaves
+`query-errors` alone; the page then can't show what rate limiting does.
+The Server options page lists this, and everything else Jarl adds to
+named.conf by itself, under **Added by Jarl** (`jarl option generated`).
 
 The statistics also count it: the `rrl` breakdown (`drop`, `slip`,
 `would-drop`, `would-slip`), the `ratelimited` and `ratelimited_name` top
@@ -160,6 +163,36 @@ external`). Set in the server options, it applies to every view that has
 none of its own, your internal resolver included, which RRL isn't meant
 for.
 
+## Mail
+
+Receivers such as Gmail and Outlook check the address mail comes from: it
+needs a PTR record (reverse DNS), and the name it gives must resolve back
+to the address. Without that, mail is rejected or marked as spam. The PTR
+records of your public addresses live in the reverse zones of whoever
+owns the addresses, your hosting provider or ISP: you set them in their
+panel, not in Jarl. A reverse zone you create in Jarl only answers your
+own clients (unless the owner delegated it to you).
+
+So Jarl checks them as the internet sees them, through the public
+resolvers of `acme.resolvers`: the addresses of every public zone's MX
+hosts (receiving) and SPF `ip4:`, `ip6:`, `a` and `a:` addresses
+(sending). The Exposure page's **Mail reverse DNS** panel shows each
+address, its PTR, who runs its reverse zone (the provider, from the
+zone's name server) and what to do; jarld checks a minute after it starts
+and every 6 hours, and logs an address that goes wrong.
+
+```
+$ jarl exposure mail
+ZONE         ADDRESS          FOR                           PTR               STATUS
+adbraun.lol  172.235.168.106  SPF ip4, MX mail.adbraun.lol  mail.adbraun.lol  ok
+```
+
+It warns when an address has no PTR record, or when its name doesn't
+resolve back to it; notes when the name is an alias (CNAME), or isn't the
+MX name (fine if the mail server uses it in HELO). `jarl exposure mail`
+exits 1 when an address isn't right; Prometheus has
+`jarl_mail_reverse_dns_ok{zone,address}`.
+
 ## Confirming a change that opens a view up
 
 A change that *introduces* an open resolver, open zone transfers, cache
@@ -204,7 +237,8 @@ monitoring, response size limits and usually a machine of its own.
 
 | Method | Path | Body |
 |--------|------|------|
-| GET | `/exposure` | `scopes` (per view, or the server: `public`, `override`, `reason`, `rate_limit` off/log-only/enforcing, `findings` with `fix` where Jarl has one), `server` (server-wide findings), `rate_limiting` (last 24h, with statistics: `counts`, `networks`, `names`) |
+| GET | `/exposure` | `scopes` (per view, or the server: `public`, `override`, `reason`, `rate_limit` off/log-only/enforcing, `findings` with `fix` where Jarl has one), `server` (server-wide findings), `rate_limiting` (last 24h, with statistics: `counts`, `networks`, `names`), `rate_limit_log`, `mail` (the last mail check) |
+| POST | `/exposure/mail` | Checks the mail addresses' reverse DNS now: `checked`, `results` (`zone`, `address`, `roles`, `ptr`, `ok`, `level` ok/info/warning, `message`, `reverse_zone`, `managed_by`, `local_zone`), `errors` |
 | POST | `/exposure/fix` | `{"view": "external", "code": "exposure_rate_limit"}` (`view_id` works too; no view: the server). Staged with `?changeset=` like any change |
 | POST | `/exposure/ack` | `{"view": "external", "code": "security_open_resolver", "reason": "..."}` |
 | POST | `/exposure/unack` | `{"view": "external", "code": "security_open_resolver"}` |

docs/metrics.md

@@ -132,6 +132,8 @@ same values.
 | `jarl_certificate_expiry_timestamp_seconds{certificate,source}` | When each certificate Jarl manages expires ([certificates.md](certificates.md)). |
 | `jarl_certificate_failing{certificate,source}` | 1 when obtaining (or reading) the certificate failed the last time, or it has expired. |
 | `jarl_certificate_renewal_failures{certificate}` | Failed attempts to obtain a certificate since its last success. |
+| `jarl_mail_reverse_dns_ok{zone,address}` | 1 when an address that sends or receives a public zone's mail has a PTR record that resolves back to it, at the last check, every 6 hours ([exposure.md](exposure.md#mail)). |
+| `jarl_encrypted_dns_up{kind,address,port}` | 1 when the DoT or DoH listener answered with the right, current certificate at the last check ([encrypted-dns.md](encrypted-dns.md#health)). |
 
 ### Queries (with `stats.enabled`)
 
@@ -232,6 +234,15 @@ groups:
         expr: jarl_certificate_expiry_timestamp_seconds - time() < 10 * 86400
         annotations:
           summary: "Certificate {{ $labels.certificate }} expires within 10 days"
+      - alert: EncryptedDNSDown
+        expr: jarl_encrypted_dns_up == 0
+        for: 20m
+        annotations:
+          summary: "DNS over {{ $labels.kind }} on {{ $labels.address }} port {{ $labels.port }} isn't working (see the Encrypted DNS page)"
+      - alert: MailReverseDNS
+        expr: jarl_mail_reverse_dns_ok == 0
+        annotations:
+          summary: "{{ $labels.address }} ({{ $labels.zone }} mail) has no reverse DNS that resolves back: receivers may reject its mail"
       - alert: BlockingPausedForLong
         expr: jarl_blocking_paused == 1
         for: 24h

docs/stats.md

@@ -60,6 +60,7 @@ off again. The statistics database stays until you delete it
 stats:
   enabled: false
   query_log: true          # per-query data; false = named's counters only
+  rate_limit_log: true     # with a rate-limit: also log what it limits (query-errors)
   database: /var/lib/jarl/stats.db
   statistics_channel: 127.0.0.1:8058   # must be a loopback address
   log_file: /var/log/named/jarl-responses.log
@@ -81,6 +82,13 @@ the response log. Logging every answer costs named some CPU and disk I/O,
 which is negligible at homelab volumes. At tens of thousands of queries per
 second, consider counters only.
 
+`rate_limit_log` matters only with a `rate-limit` set: Jarl then sends
+named's `query-errors` category (where rate limiting logs what it limits,
+or would in log-only mode) to the response log too, and keeps it in
+syslog. That other query errors come along is the price; `false` stops it,
+and the Exposure page can't show rate limiting's activity then
+([exposure.md](exposure.md#response-rate-limiting)).
+
 `exclude_clients` drops those clients from the log-derived figures (top
 lists, views, zones). named's own counters can't be filtered.
 
@@ -184,6 +192,26 @@ jarl stats summary --since 30d -o json     # export (also -o yaml)
 `operator` roles include it, `dns-editor` doesn't. Statistics show client
 addresses and what they look up, so grant it with care.
 
+## Views
+
+With views, the Statistics page has a toggle per view (and **All** and
+**None**): switch some off to see only the others, for example your
+internal and VPS views without the internet's noise on the external one,
+or several linked views together. The choice is remembered in your
+browser. The CLI takes `--view` on every `jarl stats` command (repeat it,
+or separate views with commas), and the API `?views=internal,vps`.
+
+Only what named's response log says can be split by view: answers (shown
+as *answers* instead of queries), result codes, record types, zones,
+blocking, rate limiting and the top lists. named's own counters (answer
+sources, transport, upstream response times, DNSSEC, the cache and the
+server) are for the whole server, and the page says so; asking for them
+per view (`jarl stats breakdown answer --view internal`) is refused.
+
+Per-view figures are kept from the version that added them (Jarl 0.4.1);
+the page says since when. They take some more room in the statistics
+database, roughly in proportion to the number of views.
+
 ## How data is kept
 
 - Minute counters are kept for `retention.minute`, hourly counters and top

docs/views.md

@@ -209,6 +209,23 @@ each view (Jarl lists them). Share the right version afterwards. Unlinking
 keeps every record, all local; a link left with one zone is dissolved, as
 when the other zone is deleted.
 
+**Comparing the views.** The zone's **Compare views** tab, or `jarl zone
+diff adbraun.lol`, lines the views up and shows each name and type that
+differs: a view's own records, or a name one view lacks. **Use this
+version** (`jarl record update ID --shared`) makes one view's version
+every view's. It works for zones that aren't linked too, to see what
+linking them would keep local.
+
+```
+$ jarl zone diff adbraun.lol
+NAME  TYPE  INTERNAL                    EXTERNAL
+nas   A     10.0.10.20 [local, id 812]  203.0.113.20 [local, id 790]
+5 names and types differ, 21 are the same; linked
+```
+
+`--local` also works on a zone that isn't linked (its records are local
+anyway), so scripts don't need to know; `--shared` there is refused.
+
 **Permissions** are checked in every view a change reaches. A token with
 a grant for one view only (`views=internal`) can change that view's local
 records and make overrides, but not a shared record, since that would

internal/api/types.go

@@ -34,6 +34,9 @@ type Zone struct {
 	LinkedWith []string `json:"linked_with,omitempty"`
 	// Links are the zones this one is linked with, with their views.
 	Links []ZoneLink `json:"links,omitempty"`
+	// OtherViews are the other views with a primary zone of this name
+	// (linked or not): what GET /zones/{zone}/compare compares.
+	OtherViews []string `json:"other_views,omitempty"`
 	// Pending is set when listing with a changeset: add, change or delete.
 	Pending string `json:"pending,omitempty"`
 }
@@ -266,6 +269,9 @@ type StatusResponse struct {
 	// Certificates sums up the TLS certificates Jarl manages
 	// (administrators only, when there are any).
 	Certificates *CertSummary `json:"certificates,omitempty"`
+	// EncryptedDNS is the last check of DNS over TLS and HTTPS, when it
+	// is set up (for those who may see options).
+	EncryptedDNS *EncDNSSummary `json:"encrypted_dns,omitempty"`
 }
 
 // CertSummary is what the dashboard reports about certificates.
@@ -575,3 +581,11 @@ type ZoneLink struct {
 	ID   int64  `json:"id"`
 	View string `json:"view"`
 }
+
+// EncDNSSummary is what the dashboard says about encrypted DNS.
+type EncDNSSummary struct {
+	Checked  time.Time `json:"checked"`
+	OK       bool      `json:"ok"`
+	Problems []string  `json:"problems"`
+	Warnings []string  `json:"warnings"`
+}

internal/certs/certs_test.go

@@ -25,6 +25,7 @@ import (
 	"github.com/miekg/dns"
 
 	"jarl/internal/auth"
+	"jarl/internal/encdns"
 	"jarl/internal/engine"
 	"jarl/internal/model"
 	"jarl/internal/porkbun"
@@ -488,3 +489,34 @@ func TestCleanLegoError(t *testing.T) {
 		t.Errorf("rate limit: %s", got)
 	}
 }
+
+// When certificates.dir changes, Start writes the certificates to the new
+// place and points encrypted DNS's tls statement there.
+func TestDirChangeFollowed(t *testing.T) {
+	e := newEnv(t, false)
+	ctx := context.Background()
+	admin := &auth.Principal{User: &model.User{Username: "admin", Admin: true}}
+	now := time.Now()
+	certFile, keyFile := filepath.Join(e.dir, "c.pem"), filepath.Join(e.dir, "k.pem")
+	cert, key := makeCert(t, []string{"dns.example.com"}, now.Add(-time.Hour), now.Add(60*24*time.Hour), true)
+	os.WriteFile(certFile, cert, 0o600)
+	os.WriteFile(keyFile, key, 0o600)
+	if _, err := e.m.Create(ctx, Input{Name: model.Ptr("dns"), Source: model.Ptr("file"), CertFile: &certFile, KeyFile: &keyFile, Uses: &[]string{"dns"}}, admin); err != nil {
+		t.Fatal(err)
+	}
+	e.submit(engine.NewRequest(engine.OpOptionCreate, 0, engine.OptionInput{Scope: model.Ptr(model.ScopeTopLevel), Name: model.Ptr("tls"), Value: model.Ptr(encdns.TLSValue("dns", e.m.cfg.Dir))}))
+
+	moved := filepath.Join(e.dir, "tls-moved")
+	cfg := e.m.cfg
+	cfg.Dir = moved
+	m2 := New(cfg, e.st, e.eng, slog.New(slog.NewTextHandler(io.Discard, nil)))
+	m2.Start(ctx)
+	if _, err := os.Stat(filepath.Join(moved, "dns", ChainFile)); err != nil {
+		t.Fatalf("not written to the new place: %v", err)
+	}
+	for _, o := range e.state().ScopedOptions(model.ScopeTopLevel, 0) {
+		if o.Name == "tls" && !strings.Contains(o.Value, moved+"/dns/fullchain.pem") {
+			t.Errorf("tls statement still points elsewhere: %s", o.Value)
+		}
+	}
+}

internal/certs/manager.go

@@ -22,6 +22,7 @@ import (
 	legolog "github.com/go-acme/lego/v4/log"
 
 	"jarl/internal/auth"
+	"jarl/internal/encdns"
 	"jarl/internal/engine"
 	"jarl/internal/model"
 	"jarl/internal/porkbun"
@@ -766,6 +767,40 @@ func (m *Manager) Start(ctx context.Context) {
 			}
 		}
 	}
+	m.followDir(ctx, all)
+}
+
+// followDir points the tls statements encrypted DNS wrote (jarl-NAME) at
+// certificates.dir when it has changed: Start has just written the
+// certificates there, and named would otherwise keep serving the old
+// copies, which renewals no longer update.
+func (m *Manager) followDir(ctx context.Context, all []*model.Certificate) {
+	st, err := m.store.LoadState(ctx)
+	if err != nil {
+		return
+	}
+	var reqs []engine.Request
+	for _, b := range encdns.TLSBlocks(st) {
+		name, ok := strings.CutPrefix(b.Name, encdns.Prefix)
+		if !ok || filepath.Dir(b.CertFile) == m.FilesDir(name) {
+			continue
+		}
+		i := slices.IndexFunc(all, func(c *model.Certificate) bool { return c.Name == name })
+		if i < 0 || !all[i].HasUse(model.CertUseDNS) {
+			continue
+		}
+		if _, err := os.Stat(filepath.Join(m.FilesDir(name), ChainFile)); err != nil {
+			continue // not written there (yet)
+		}
+		reqs = append(reqs, engine.NewRequest(engine.OpOptionUpdate, b.OptionID, engine.OptionInput{Value: model.Ptr(encdns.TLSValue(name, m.cfg.Dir))}))
+		m.log.Info("certificates.dir changed: pointing named at the new files", "tls", b.Name, "was", filepath.Dir(b.CertFile), "now", m.FilesDir(name))
+	}
+	if len(reqs) == 0 {
+		return
+	}
+	if _, err := m.eng.Submit(ctx, reqs, auth.System, "jarld", "certificates.dir changed: tls statements follow it", engine.ApplyOptions{}); err != nil {
+		m.log.Error("pointing named at the moved certificate files failed; run 'jarl encrypted-dns setup' again", "err", err)
+	}
 }
 
 // Run renews certificates when they are due and rereads file-source ones

internal/config/config.go

@@ -364,6 +364,10 @@ type Stats struct {
 	// per-zone counts) from named's response log. Without it only named's
 	// own counters are collected.
 	QueryLog bool `yaml:"query_log"`
+	// RateLimitLog sends rate limiting's log lines (named's query-errors
+	// category) to the response log too, so the Exposure page and the
+	// statistics can show what was, or would be, limited.
+	RateLimitLog bool `yaml:"rate_limit_log"`
 	// Database is the statistics database, kept apart from Jarl's
 	// configuration database.
 	Database string `yaml:"database"`
@@ -451,6 +455,7 @@ func Default() *Config {
 		},
 		Stats: Stats{
 			QueryLog:          true,
+			RateLimitLog:      true,
 			Database:          "/var/lib/jarl/stats.db",
 			StatisticsChannel: "127.0.0.1:8058",
 			LogFile:           "/var/log/named/jarl-responses.log",
@@ -736,6 +741,10 @@ stats:
   # Per-query data (top names and clients, per view and zone). false
   # collects only named's own counters, with no logging overhead.
   query_log: true
+  # With a rate-limit set, also log what rate limiting limits (or would,
+  # in log-only mode): named's query-errors category, which Jarl then adds
+  # to its log channel (and keeps in syslog). The Exposure page shows it.
+  rate_limit_log: true
   database: /var/lib/jarl/stats.db
   statistics_channel: 127.0.0.1:8058
   log_file: /var/log/named/jarl-responses.log

internal/encdns/encdns.go

@@ -272,9 +272,7 @@ func Plan(st *model.State, s Setup, certDir string) ([]engine.Request, []string,
 		return nil, nil, fmt.Errorf("choose at least one address to listen on")
 	}
 	tlsName := Prefix + s.Certificate
-	dir := filepath.Join(certDir, s.Certificate)
-	tlsValue := fmt.Sprintf(`%s { cert-file "%s"; key-file "%s"; protocols { TLSv1.2; TLSv1.3; }; }`,
-		tlsName, filepath.Join(dir, "fullchain.pem"), filepath.Join(dir, "privkey.pem"))
+	tlsValue := TLSValue(s.Certificate, certDir)
 
 	var reqs []engine.Request
 	// Take out the earlier setup's listeners and tls statements.
@@ -393,3 +391,11 @@ func Private(a netip.Addr) bool {
 	a = a.Unmap()
 	return a.IsPrivate() || a.IsLoopback() || a.IsLinkLocalUnicast() || netip.MustParsePrefix("100.64.0.0/10").Contains(a)
 }
+
+// TLSValue is the tls statement the setup writes for a certificate whose
+// files are in certDir/NAME.
+func TLSValue(cert, certDir string) string {
+	dir := filepath.Join(certDir, cert)
+	return fmt.Sprintf(`%s { cert-file "%s"; key-file "%s"; protocols { TLSv1.2; TLSv1.3; }; }`,
+		Prefix+cert, filepath.Join(dir, "fullchain.pem"), filepath.Join(dir, "privkey.pem"))
+}

internal/encdns/health.go

@@ -0,0 +1,208 @@
+package encdns
+
+import (
+	"bytes"
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/miekg/dns"
+)
+
+// Probe is the outcome of checking one DoT or DoH listener the way a
+// client would: connect, check the certificate, ask a question.
+type Probe struct {
+	Kind    string `json:"kind"` // dot or doh
+	Address string `json:"address"`
+	Port    int    `json:"port"`
+	// OK: it answered over TLS with a certificate for the host name that
+	// is current. Problem says what is wrong when not; Warning notes
+	// something that doesn't stop clients from working everywhere.
+	OK      bool   `json:"ok"`
+	Problem string `json:"problem,omitempty"`
+	Warning string `json:"warning,omitempty"`
+	// What the certificate named served says.
+	CertNames    []string   `json:"cert_names,omitempty"`
+	CertNotAfter *time.Time `json:"cert_not_after,omitempty"`
+	CertSerial   string     `json:"cert_serial,omitempty"`
+	// Trusted: it chains to a CA this server trusts (not so for a
+	// staging or test CA).
+	Trusted bool   `json:"trusted"`
+	RCode   string `json:"rcode,omitempty"`
+	Millis  int64  `json:"ms"`
+}
+
+// Health is the last check of every listener.
+type Health struct {
+	Checked time.Time `json:"checked"`
+	Probes  []Probe   `json:"probes"`
+}
+
+// OK reports whether every listener works.
+func (h *Health) OK() bool {
+	for _, p := range h.Probes {
+		if !p.OK {
+			return false
+		}
+	}
+	return true
+}
+
+// Check probes every DoT and DoH listener of the setup. hostname is what
+// clients ask for, serial the certificate Jarl last wrote for named ("" if
+// unknown), roots the CAs to trust (nil: the system's).
+func Check(ctx context.Context, s Status, hostname, serial string, roots *x509.CertPool) *Health {
+	h := &Health{Checked: time.Now(), Probes: []Probe{}}
+	for _, e := range s.DoT {
+		h.Probes = append(h.Probes, probe(ctx, "dot", e, hostname, serial, roots))
+	}
+	for _, e := range s.DoH {
+		h.Probes = append(h.Probes, probe(ctx, "doh", e, hostname, serial, roots))
+	}
+	return h
+}
+
+const probeTimeout = 5 * time.Second
+
+func probe(ctx context.Context, kind string, e Endpoint, hostname, serial string, roots *x509.CertPool) Probe {
+	p := Probe{Kind: kind, Address: e.Address, Port: e.Port}
+	addr := net.JoinHostPort(e.Address, strconv.Itoa(e.Port))
+	ctx, cancel := context.WithTimeout(ctx, probeTimeout)
+	defer cancel()
+	start := time.Now()
+	q := new(dns.Msg)
+	q.SetQuestion(dns.Fqdn(hostname), dns.TypeA)
+	q.RecursionDesired = true
+	var state tls.ConnectionState
+	var answer *dns.Msg
+	var err error
+	cfg := &tls.Config{ServerName: hostname, InsecureSkipVerify: true, MinVersion: tls.VersionTLS12} // checked below, to say what is wrong
+	if kind == "dot" {
+		cfg.NextProtos = []string{"dot"}
+		state, answer, err = askDoT(ctx, addr, cfg, q)
+	} else {
+		state, answer, err = askDoH(ctx, addr, hostname, e.Port, cfg, q)
+	}
+	p.Millis = time.Since(start).Milliseconds()
+	if len(state.PeerCertificates) > 0 {
+		leaf := state.PeerCertificates[0]
+		p.CertNames, p.CertSerial = leaf.DNSNames, fmt.Sprintf("%x", leaf.SerialNumber)
+		na := leaf.NotAfter
+		p.CertNotAfter = &na
+		inter := x509.NewCertPool()
+		for _, c := range state.PeerCertificates[1:] {
+			inter.AddCert(c)
+		}
+		_, verr := leaf.Verify(x509.VerifyOptions{Roots: roots, Intermediates: inter, DNSName: hostname})
+		p.Trusted = verr == nil
+		switch {
+		case leaf.VerifyHostname(hostname) != nil:
+			p.Problem = fmt.Sprintf("named serves a certificate for %s, not %s: clients reject it", strings.Join(leaf.DNSNames, ", "), hostname)
+		case time.Now().After(leaf.NotAfter):
+			p.Problem = "named serves an expired certificate (until " + leaf.NotAfter.Format(time.DateOnly) + ")"
+		case serial != "" && p.CertSerial != serial:
+			p.Problem = "named still serves an older certificate (serial " + p.CertSerial + ", Jarl has " + serial + "): it hasn't reread the files (rndc reconfig)"
+		case !p.Trusted:
+			p.Warning = "the certificate isn't from a CA this server trusts (a staging or test CA?): clients reject it unless they trust that CA"
+		}
+	}
+	switch {
+	case err != nil:
+		p.Problem = describe(err, e)
+	case p.Problem != "":
+	case answer == nil:
+		p.Problem = "no DNS answer"
+	default:
+		p.RCode = dns.RcodeToString[answer.Rcode]
+		p.OK = true
+		if answer.Rcode == dns.RcodeRefused {
+			p.Warning = strings.TrimPrefix(p.Warning+"; ", "; ") + "it answers, but REFUSED: this server's own address gets a view that doesn't answer for " + hostname
+		}
+	}
+	return p
+}
+
+func askDoT(ctx context.Context, addr string, cfg *tls.Config, q *dns.Msg) (tls.ConnectionState, *dns.Msg, error) {
+	d := &tls.Dialer{NetDialer: &net.Dialer{Timeout: probeTimeout}, Config: cfg}
+	conn, err := d.DialContext(ctx, "tcp", addr)
+	if err != nil {
+		return tls.ConnectionState{}, nil, err
+	}
+	defer conn.Close()
+	tc := conn.(*tls.Conn)
+	state := tc.ConnectionState()
+	conn.SetDeadline(time.Now().Add(probeTimeout))
+	co := &dns.Conn{Conn: conn}
+	if err := co.WriteMsg(q); err != nil {
+		return state, nil, err
+	}
+	r, err := co.ReadMsg()
+	return state, r, err
+}
+
+func askDoH(ctx context.Context, addr, hostname string, port int, cfg *tls.Config, q *dns.Msg) (tls.ConnectionState, *dns.Msg, error) {
+	cfg = cfg.Clone()
+	cfg.NextProtos = []string{"h2", "http/1.1"}
+	tr := &http.Transport{
+		TLSClientConfig:   cfg,
+		ForceAttemptHTTP2: true,
+		// Whatever the host name resolves to here: the listener's address.
+		DialContext: func(ctx context.Context, network, _ string) (net.Conn, error) {
+			return (&net.Dialer{Timeout: probeTimeout}).DialContext(ctx, network, addr)
+		},
+	}
+	defer tr.CloseIdleConnections()
+	wire, err := q.Pack()
+	if err != nil {
+		return tls.ConnectionState{}, nil, err
+	}
+	url := "https://" + net.JoinHostPort(hostname, strconv.Itoa(port)) + "/dns-query"
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(wire))
+	if err != nil {
+		return tls.ConnectionState{}, nil, err
+	}
+	req.Header.Set("Content-Type", "application/dns-message")
+	req.Header.Set("Accept", "application/dns-message")
+	resp, err := (&http.Client{Transport: tr, Timeout: probeTimeout}).Do(req)
+	if err != nil {
+		return tls.ConnectionState{}, nil, err
+	}
+	defer resp.Body.Close()
+	var state tls.ConnectionState
+	if resp.TLS != nil {
+		state = *resp.TLS
+	}
+	body, err := io.ReadAll(io.LimitReader(resp.Body, 64<<10))
+	if err != nil {
+		return state, nil, err
+	}
+	if resp.StatusCode != http.StatusOK {
+		return state, nil, fmt.Errorf("HTTP %d at /dns-query", resp.StatusCode)
+	}
+	r := new(dns.Msg)
+	if err := r.Unpack(body); err != nil {
+		return state, nil, fmt.Errorf("not a DNS answer: %w", err)
+	}
+	return state, r, nil
+}
+
+// describe says what a failed probe means.
+func describe(err error, e Endpoint) string {
+	var ne net.Error
+	switch {
+	case errors.Is(err, syscall.ECONNREFUSED):
+		return fmt.Sprintf("nothing listens on %s port %d: named may not have been able to bind it (look in named's log; ports below 1024 need named to start as root)", e.Address, e.Port)
+	case errors.As(err, &ne) && ne.Timeout(), errors.Is(err, context.DeadlineExceeded):
+		return fmt.Sprintf("no answer from %s port %d within %s (a firewall on the server?)", e.Address, e.Port, probeTimeout)
+	}
+	return err.Error()
+}

internal/encdns/health_test.go

@@ -0,0 +1,115 @@
+package encdns
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"io"
+	"math/big"
+	"net"
+	"net/http"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/miekg/dns"
+)
+
+func testCert(t *testing.T, names ...string) (tls.Certificate, *x509.Certificate) {
+	key, _ := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	tmpl := &x509.Certificate{SerialNumber: big.NewInt(0xabc123), Subject: pkix.Name{CommonName: names[0]}, DNSNames: names,
+		NotBefore: time.Now().Add(-time.Hour), NotAfter: time.Now().Add(24 * time.Hour), ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}}
+	der, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, &key.PublicKey, key)
+	if err != nil {
+		t.Fatal(err)
+	}
+	leaf, _ := x509.ParseCertificate(der)
+	return tls.Certificate{Certificate: [][]byte{der}, PrivateKey: key, Leaf: leaf}, leaf
+}
+
+// answer answers every question with 192.0.2.53.
+var answer = dns.HandlerFunc(func(w dns.ResponseWriter, r *dns.Msg) {
+	m := new(dns.Msg)
+	m.SetReply(r)
+	m.Answer = append(m.Answer, &dns.A{Hdr: dns.RR_Header{Name: r.Question[0].Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60}, A: net.ParseIP("192.0.2.53")})
+	w.WriteMsg(m)
+})
+
+func listeners(t *testing.T, cert tls.Certificate) (dot, doh Endpoint) {
+	cfg := &tls.Config{Certificates: []tls.Certificate{cert}}
+	ln, err := tls.Listen("tcp", "127.0.0.1:0", cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	srv := &dns.Server{Listener: ln, Net: "tcp-tls", Handler: answer}
+	go srv.ActivateAndServe()
+	t.Cleanup(func() { srv.Shutdown() })
+	hl, err := tls.Listen("tcp", "127.0.0.1:0", cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	hs := &http.Server{Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/dns-query" {
+			http.NotFound(w, r)
+			return
+		}
+		b, _ := io.ReadAll(r.Body)
+		q := new(dns.Msg)
+		if q.Unpack(b) != nil {
+			http.Error(w, "bad", 400)
+			return
+		}
+		m := new(dns.Msg)
+		m.SetReply(q)
+		m.Rcode = dns.RcodeSuccess
+		out, _ := m.Pack()
+		w.Header().Set("Content-Type", "application/dns-message")
+		w.Write(out)
+	})}
+	go hs.Serve(hl)
+	t.Cleanup(func() { hs.Close() })
+	port := func(l net.Listener) int { return l.Addr().(*net.TCPAddr).Port }
+	return Endpoint{"127.0.0.1", port(ln)}, Endpoint{"127.0.0.1", port(hl)}
+}
+
+func TestHealth(t *testing.T) {
+	ctx := context.Background()
+	cert, leaf := testCert(t, "dns.example.com")
+	dot, doh := listeners(t, cert)
+	roots := x509.NewCertPool()
+	roots.AddCert(leaf)
+	st := Status{Enabled: true, DoT: []Endpoint{dot}, DoH: []Endpoint{doh}}
+
+	h := Check(ctx, st, "dns.example.com", "abc123", roots)
+	if !h.OK() || len(h.Probes) != 2 {
+		t.Fatalf("working setup: %+v", h.Probes)
+	}
+	for _, p := range h.Probes {
+		if !p.Trusted || p.RCode != "NOERROR" || p.Warning != "" || p.CertSerial != "abc123" {
+			t.Errorf("%s: %+v", p.Kind, p)
+		}
+	}
+	// named hasn't reread a renewed certificate.
+	if h := Check(ctx, st, "dns.example.com", "def456", roots); h.OK() || !strings.Contains(h.Probes[0].Problem, "older certificate") {
+		t.Errorf("stale: %+v", h.Probes[0])
+	}
+	// The wrong name.
+	if h := Check(ctx, st, "other.example.com", "", roots); h.OK() || !strings.Contains(h.Probes[0].Problem, "not other.example.com") {
+		t.Errorf("wrong name: %+v", h.Probes[0])
+	}
+	// A CA this server doesn't trust: works, with a warning.
+	if h := Check(ctx, st, "dns.example.com", "abc123", x509.NewCertPool()); !h.OK() || !strings.Contains(h.Probes[1].Warning, "staging") {
+		t.Errorf("untrusted: %+v", h.Probes[1])
+	}
+	// Nothing listening.
+	l, _ := net.Listen("tcp", "127.0.0.1:0")
+	gone := l.Addr().(*net.TCPAddr).Port
+	l.Close()
+	if h := Check(ctx, Status{Enabled: true, DoT: []Endpoint{{"127.0.0.1", gone}}}, "dns.example.com", "", roots); h.OK() || !strings.Contains(h.Probes[0].Problem, "nothing listens") {
+		t.Errorf("nothing listening: %+v", h.Probes[0])
+	}
+}

internal/engine/compare.go

@@ -0,0 +1,104 @@
+package engine
+
+import (
+	"fmt"
+	"slices"
+	"strings"
+
+	"jarl/internal/model"
+)
+
+// ViewSet is what one view has for a name and type.
+type ViewSet struct {
+	View    string   `json:"view"`
+	ZoneID  int64    `json:"zone_id"`
+	Records []string `json:"records"`          // data (with TTL and "(disabled)" when set), sorted
+	IDs     []int64  `json:"ids"`              // the records, in the same order
+	Linked  string   `json:"linked,omitempty"` // shared or local, in a linked zone
+}
+
+// CompareRow is one name and type across views.
+type CompareRow struct {
+	Name  string    `json:"name"` // relative to the zone
+	FQDN  string    `json:"fqdn"`
+	Type  string    `json:"type"`
+	Same  bool      `json:"same"`
+	Views []ViewSet `json:"views"` // in the order of the zones given
+}
+
+// CompareZones lines up the records of zones of the same name in
+// different views (docs/views.md#linked-zones), one row per name and type,
+// sorted like a zone file.
+func CompareZones(st *model.State, zones []*model.Zone) []CompareRow {
+	type key struct{ name, typ string }
+	sets := make([]map[key][]*model.Record, len(zones))
+	var keys []key
+	seen := map[key]bool{}
+	var all []*model.Record
+	for i, z := range zones {
+		sets[i] = map[key][]*model.Record{}
+		for _, r := range st.ZoneRecords(z.ID) {
+			k := key{r.Name, r.Type}
+			sets[i][k] = append(sets[i][k], r)
+			if !seen[k] {
+				seen[k] = true
+				keys = append(keys, k)
+				all = append(all, r)
+			}
+		}
+	}
+	if len(zones) > 0 {
+		// Zone file order: the apex first, then by name and type.
+		model.SortRecords(all, zones[0])
+		keys = keys[:0]
+		for _, r := range all {
+			keys = append(keys, key{r.Name, r.Type})
+		}
+	}
+	var out []CompareRow
+	for _, k := range keys {
+		row := CompareRow{FQDN: k.name, Type: k.typ, Same: true}
+		if len(zones) > 0 {
+			row.Name = relName(k.name, zones[0].Name)
+		}
+		var first string
+		for i, z := range zones {
+			vs := ViewSet{View: st.ViewName(z), ZoneID: z.ID, Records: []string{}, IDs: []int64{}}
+			rs := slices.Clone(sets[i][k])
+			slices.SortFunc(rs, func(a, b *model.Record) int { return strings.Compare(strings.ToLower(a.Data), strings.ToLower(b.Data)) })
+			for _, r := range rs {
+				d := r.Data
+				if r.TTL != nil {
+					d = fmt.Sprintf("%s (TTL %d)", d, *r.TTL)
+				}
+				if r.Disabled {
+					d += " (disabled)"
+				}
+				vs.Records = append(vs.Records, d)
+				vs.IDs = append(vs.IDs, r.ID)
+			}
+			if z.LinkGroup != 0 && len(rs) > 0 {
+				vs.Linked = "shared"
+				if rs[0].SharedID == 0 {
+					vs.Linked = "local"
+				}
+			}
+			sig := strings.Join(vs.Records, "\n")
+			if i == 0 {
+				first = sig
+			} else if sig != first {
+				row.Same = false
+			}
+			row.Views = append(row.Views, vs)
+		}
+		out = append(out, row)
+	}
+	return out
+}
+
+func relName(name, zone string) string {
+	if name == zone {
+		return "@"
+	}
+	return strings.TrimSuffix(name, "."+zone)
+}

internal/engine/expand.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/netip"
+	"slices"
 	"strings"
 	"time"
 
@@ -642,11 +643,42 @@ func (x *expander) ptrCreate(z *model.Zone, owner string, p *rr.Parsed) ([]model
 	if !ok {
 		return nil, errf(KindBadRequest, "ptr only applies to A and AAAA records")
 	}
-	rz, ptrName := reverseZoneFor(x.st, z.ViewID, addr)
-	if rz == nil {
-		x.warnings = append(x.warnings, fmt.Sprintf("no reverse zone for %s in this view, so no PTR record was added", addr))
-		return nil, nil
+	var ops []model.Op
+	found := false
+	for _, vid := range ptrViews(x.st, z) {
+		rz, ptrName := reverseZoneFor(x.st, vid, addr)
+		if rz == nil {
+			continue
+		}
+		found = true
+		more, err := x.ptrCreateIn(rz, ptrName, owner)
+		if err != nil {
+			return nil, err
+		}
+		ops = append(ops, more...)
 	}
+	if !found {
+		x.warnings = append(x.warnings, fmt.Sprintf("no reverse zone for %s in this view, so no PTR record was added (create one: jarl zone create %s/%d)", addr, addr, addr.BitLen()))
+	}
+	return ops, nil
+}
+
+// ptrViews are the views whose reverse zones get the PTR records of zone
+// z's address records: z's own, and, for a linked zone, the other views
+// of the link (the record is in all of them).
+func ptrViews(st *model.State, z *model.Zone) []int64 {
+	out := []int64{z.ViewID}
+	for _, o := range st.LinkedWith(z) {
+		if !slices.Contains(out, o.ViewID) {
+			out = append(out, o.ViewID)
+		}
+	}
+	return out
+}
+
+// ptrCreateIn returns operations creating the PTR record ptrName -> owner
+// in reverse zone rz (none when it is there; enabling it when disabled).
+func (x *expander) ptrCreateIn(rz *model.Zone, ptrName, owner string) ([]model.Op, error) {
 	for _, r := range x.st.ZoneRecords(rz.ID) {
 		if r.Name == ptrName && r.Type == "PTR" {
 			if strings.EqualFold(r.Data, owner) {
@@ -674,10 +706,18 @@ func (x *expander) ptrSetDisabled(z *model.Zone, owner string, p *rr.Parsed, dis
 	if !ok {
 		return nil
 	}
-	rz, ptrName := reverseZoneFor(x.st, z.ViewID, addr)
-	if rz == nil {
-		return nil
+	var ops []model.Op
+	for _, vid := range ptrViews(x.st, z) {
+		rz, ptrName := reverseZoneFor(x.st, vid, addr)
+		if rz == nil {
+			continue
+		}
+		ops = append(ops, x.ptrSetDisabledIn(rz, ptrName, owner, disabled)...)
 	}
+	return ops
+}
+
+func (x *expander) ptrSetDisabledIn(rz *model.Zone, ptrName, owner string, disabled bool) []model.Op {
 	var ops []model.Op
 	for _, r := range x.st.ZoneRecords(rz.ID) {
 		if r.Name == ptrName && r.Type == "PTR" && strings.EqualFold(r.Data, owner) && r.Disabled != disabled {
@@ -700,12 +740,16 @@ func (x *expander) ptrDelete(z *model.Zone, owner string, p *rr.Parsed) []model.
 	if !ok {
 		return nil
 	}
-	rz, ptrName := reverseZoneFor(x.st, z.ViewID, addr)
-	if rz == nil {
-		return nil
+	var ops []model.Op
+	for _, vid := range ptrViews(x.st, z) {
+		rz, ptrName := reverseZoneFor(x.st, vid, addr)
+		if rz == nil {
+			continue
+		}
+		in := RecordInput{ZoneID: rz.ID, Name: model.Ptr(ptrName), Type: model.Ptr("PTR"), Data: model.Ptr(owner), MissingOK: true}
+		ops = append(ops, newOp(OpRecordDelete, 0, 0, in, fmt.Sprintf("delete %s IN PTR %s (if present)", ptrName, owner)))
 	}
-	in := RecordInput{ZoneID: rz.ID, Name: model.Ptr(ptrName), Type: model.Ptr("PTR"), Data: model.Ptr(owner), MissingOK: true}
-	return []model.Op{newOp(OpRecordDelete, 0, 0, in, fmt.Sprintf("delete %s IN PTR %s (if present)", ptrName, owner))}
+	return ops
 }
 
 // parseWarnings keeps what parsing noticed (e.g. a name read as absolute).
@@ -757,9 +801,10 @@ func (x *expander) recordCreate(req Request) ([]model.Op, error) {
 			}
 			in.SharedID = &ids[0]
 		}
-	} else if in.Local != nil && *in.Local {
-		return nil, errf(KindBadRequest, "zone %s isn't linked with other views, so its records are local anyway", zoneDesc(x.st, z))
+	} else if in.Local != nil && !*in.Local {
+		return nil, notLinked(x.st, z)
 	}
+	// local on a zone that isn't linked: its records are local anyway.
 	in.Local = nil
 	ops := []model.Op{newOp(OpRecordCreate, ids[0], 0, in, summary)}
 	if ptr {
@@ -790,10 +835,10 @@ func (x *expander) recordUpdate(req Request) ([]model.Op, error) {
 	}
 	var pre []model.Op
 	if in.Local != nil {
-		if z.LinkGroup == 0 {
-			return nil, errf(KindBadRequest, "zone %s isn't linked with other views, so its records are local anyway", zoneDesc(x.st, z))
+		if z.LinkGroup == 0 && !*in.Local {
+			return nil, notLinked(x.st, z)
 		}
-		if want := *in.Local; want != (r.SharedID == 0) {
+		if want := *in.Local; z.LinkGroup != 0 && want != (r.SharedID == 0) {
 			// The whole set of this name and type changes sides.
 			for _, o := range x.st.RRset(z.ID, r.Name, r.Type) {
 				id := int64(0)
@@ -804,10 +849,11 @@ func (x *expander) recordUpdate(req Request) ([]model.Op, error) {
 				}
 				pre = append(pre, newOp(OpRecordUpdate, o.ID, o.Version, RecordInput{SharedID: model.Ptr(id)}, what))
 			}
-			if !want {
-				// Sharing a version makes it every view's.
-				pre = append(pre, x.dropOverrides(z, r.Name, r.Type)...)
-			}
+		}
+		if z.LinkGroup != 0 && !*in.Local {
+			// Sharing a version makes it every view's, also when it is
+			// shared already and another view overrides it.
+			pre = append(pre, x.dropOverrides(z, r.Name, r.Type)...)
 		}
 		in.Local = nil
 		if string(mustJSON(in)) == "{}" {
@@ -885,7 +931,10 @@ func (x *expander) recordUpdate(req Request) ([]model.Op, error) {
 	if len(pre) > 0 {
 		base = 0 // the record was just updated by pre
 	}
-	ops := append(pre, newOp(OpRecordUpdate, r.ID, base, in, summary))
+	ops := pre
+	if string(mustJSON(in)) != "{}" || !ptr {
+		ops = append(ops, newOp(OpRecordUpdate, r.ID, base, in, summary))
+	}
 	disabled := r.Disabled
 	if in.Disabled != nil {
 		disabled = *in.Disabled
@@ -909,6 +958,15 @@ func (x *expander) recordUpdate(req Request) ([]model.Op, error) {
 		}
 		ops = append(ops, x.ptrSetDisabled(z, owner, p, disabled)...)
 	}
+	if ptr && !moved && !toggled && !disabled {
+		// Nothing else changes: make sure the PTR record is there (the
+		// reverse zone may be newer than the record).
+		more, err := x.ptrCreate(z, owner, p)
+		if err != nil {
+			return nil, err
+		}
+		ops = append(ops, more...)
+	}
 	return ops, nil
 }
 
@@ -1097,8 +1155,8 @@ func (x *expander) rrsetReplace(req Request) ([]model.Op, error) {
 			// Explicitly shared: this version becomes every view's.
 			pre = x.dropOverrides(z, owner, typ)
 		}
-	} else if in.Local != nil && *in.Local {
-		return nil, errf(KindBadRequest, "zone %s isn't linked with other views, so its records are local anyway", zoneDesc(x.st, z))
+	} else if in.Local != nil && !*in.Local {
+		return nil, notLinked(x.st, z)
 	}
 	in.Local = nil
 	if len(canon) > 0 {
@@ -1300,3 +1358,8 @@ func firstNonEmptyStr(a, b string) string {
 	}
 	return b
 }
+
+// notLinked refuses sharing a record of a zone that isn't linked.
+func notLinked(st *model.State, z *model.Zone) error {
+	return errf(KindBadRequest, "zone %s isn't linked with other views, so there is nothing to share its records with (link it first: jarl zone link)", zoneDesc(st, z))
+}

internal/engine/inputs.go

@@ -174,7 +174,9 @@ type RecordInput struct {
 	// Disabled keeps the record in Jarl but out of the zone.
 	Disabled *bool `json:"disabled,omitempty"`
 	// PTR also creates (or deletes, disables or enables) the matching PTR
-	// record in the reverse zone, for A and AAAA records.
+	// record in the reverse zone, for A and AAAA records. On an update that
+	// changes nothing else it adds the PTR record if it is missing. In a
+	// linked zone, every linked view's reverse zone counts.
 	PTR bool `json:"ptr,omitempty"`
 	// MissingOK makes a delete-by-match succeed when nothing matches.
 	MissingOK bool `json:"missing_ok,omitempty"`

internal/engine/linked_test.go

@@ -285,3 +285,59 @@ func TestLinkExisting(t *testing.T) {
 		t.Errorf("shared from internal: external %q", env.view("external"))
 	}
 }
+
+// --local on a zone that isn't linked is fine (its records are local
+// anyway); --shared there is refused.
+func TestLocalOnUnlinkedZone(t *testing.T) {
+	env := linkedEnv(t)
+	local, shared := true, false
+	env.submit(env.admin, NewRequest(OpRecordCreate, 0, RecordInput{Zone: "example.com", View: "internal", Name: model.Ptr("a"), Type: model.Ptr("A"), Data: model.Ptr("10.0.0.1"), Local: &local}))
+	env.submit(env.admin, NewRequest(OpRRSetReplace, 0, RRSetInput{Zone: "example.com", View: "internal", Name: "b", Type: "A", Data: []string{"10.0.0.2"}, Local: &local}))
+	env.submit(env.admin, NewRequest(OpRecordUpdate, env.recordID("internal", "a", "A"), RecordInput{Data: model.Ptr("10.0.0.3"), Local: &local}))
+	if v := env.view("internal"); !slices.Contains(v, "a A 10.0.0.3 L") || !slices.Contains(v, "b A 10.0.0.2 L") {
+		t.Errorf("records: %q", v)
+	}
+	if e := env.submitErr(env.admin, NewRequest(OpRecordCreate, 0, RecordInput{Zone: "example.com", View: "internal", Name: model.Ptr("c"), Type: model.Ptr("A"), Data: model.Ptr("10.0.0.4"), Local: &shared})); !strings.Contains(e.Message, "nothing to share") {
+		t.Errorf("--shared on an unlinked zone: %v", e)
+	}
+}
+
+func TestCompareZones(t *testing.T) {
+	env := linkedEnv(t)
+	env.submit(env.admin, NewRequest(OpZoneCreate, 0, ZoneInput{Name: model.Ptr("example.com"), View: model.Ptr("external"), LinkWith: "internal"}))
+	env.submit(env.admin, NewRequest(OpRRSetReplace, 0, RRSetInput{Zone: "example.com", View: "external", Name: "www", Type: "A", Data: []string{"203.0.113.10"}, Local: model.Ptr(true)}))
+	env.submit(env.admin, NewRequest(OpRecordCreate, 0, RecordInput{Zone: "example.com", View: "internal", Name: model.Ptr("nas"), Type: model.Ptr("A"), Data: model.Ptr("10.0.0.20"), Local: model.Ptr(true)}))
+	st := env.state()
+	zones := st.ZonesNamed("example.com.")
+	st.SortByView(zones)
+	diff := map[string][]string{}
+	same := 0
+	for _, row := range CompareZones(st, zones) {
+		if row.Same {
+			same++
+			continue
+		}
+		var cells []string
+		for _, vs := range row.Views {
+			cells = append(cells, vs.View+"="+strings.Join(vs.Records, ",")+"/"+vs.Linked)
+		}
+		diff[row.Name+" "+row.Type] = cells
+	}
+	want := map[string][]string{
+		"www A": {"internal=192.0.2.10/shared", "external=203.0.113.10/local"},
+		"nas A": {"internal=10.0.0.20/local", "external=/"},
+	}
+	for k, v := range want {
+		if !slices.Equal(diff[k], v) {
+			t.Errorf("%s: %q, want %q", k, diff[k], v)
+		}
+	}
+	if len(diff) != 2 || same < 3 {
+		t.Errorf("differ %v, same %d", diff, same)
+	}
+	// "Use this version" on the shared one replaces external's override.
+	env.submit(env.admin, NewRequest(OpRecordUpdate, env.recordID("internal", "www", "A"), RecordInput{Local: model.Ptr(false)}))
+	if v := env.view("external"); !slices.Contains(v, "www A 192.0.2.10 S") || slices.Contains(v, "www A 203.0.113.10 L") {
+		t.Errorf("sharing the shared version: external %q", v)
+	}
+}

internal/engine/ptr_update_test.go

@@ -0,0 +1,53 @@
+package engine
+
+import (
+	"slices"
+	"strings"
+	"testing"
+
+	"jarl/internal/model"
+)
+
+// Ticking "update PTR" on an unchanged address record adds its PTR when
+// the reverse zone is there (it was created after the record).
+func TestUpdatePTRAddsMissing(t *testing.T) {
+	env := newEnv(t)
+	env.submit(env.admin, NewRequest(OpSettingsUpdate, 0, SettingsInput{Nameservers: &[]string{"ns1.example.net."}}))
+	env.submit(env.admin, NewRequest(OpZoneCreate, 0, ZoneInput{Name: model.Ptr("example.com")}))
+	env.submit(env.admin, rec("example.com", "ldn", "A", "139.144.144.154"))
+	env.submit(env.admin, NewRequest(OpZoneCreate, 0, ZoneInput{Name: model.Ptr("139.144.144.154/32")}))
+	var id int64
+	for _, r := range env.state().Records {
+		if r.Name == "ldn.example.com." {
+			id = r.ID
+		}
+	}
+	env.submit(env.admin, NewRequest(OpRecordUpdate, id, RecordInput{PTR: true}))
+	got := env.records("154.144.144.139.in-addr.arpa.")
+	if !slices.ContainsFunc(got, func(s string) bool { return strings.Contains(s, "PTR ldn.example.com.") }) {
+		t.Errorf("reverse zone = %q", got)
+	}
+}
+
+// In linked zones the PTR goes to the reverse zone of whichever linked
+// view has one.
+func TestUpdatePTRLinked(t *testing.T) {
+	env := linkedEnv(t)
+	env.submit(env.admin, NewRequest(OpZoneCreate, 0, ZoneInput{Name: model.Ptr("example.com"), View: model.Ptr("external"), LinkWith: "internal"}))
+	env.submit(env.admin, recIn("internal", "ldn", "A", "139.144.144.154"))
+	env.submit(env.admin, NewRequest(OpZoneCreate, 0, ZoneInput{Name: model.Ptr("139.144.144.154/32"), View: model.Ptr("external")}))
+	res := env.submit(env.admin, NewRequest(OpRecordUpdate, env.recordID("internal", "ldn", "A"), RecordInput{PTR: true}))
+	st := env.state()
+	z := st.FindZone("154.144.144.139.in-addr.arpa.", st.ViewByName("external").ID)
+	ok := false
+	for _, r := range st.ZoneRecords(z.ID) {
+		ok = ok || r.Type == "PTR" && r.Data == "ldn.example.com."
+	}
+	if !ok {
+		t.Errorf("no PTR in external's reverse zone (warnings %q)", res.Warnings)
+	}
+	// Again: already there, nothing to do.
+	if e := env.submitErr(env.admin, NewRequest(OpRecordUpdate, env.recordID("internal", "ldn", "A"), RecordInput{PTR: true})); !strings.Contains(e.Message, "nothing to do") {
+		t.Errorf("second time: %v", e)
+	}
+}

internal/engine/viewkeys.go

@@ -66,3 +66,9 @@ func (e *Engine) ViewKey(ctx context.Context, st *model.State, z *model.Zone) *n
 	}
 	return &nscheck.Key{Name: render.ViewKeyName(v.Name), Algorithm: render.ViewKeyAlgorithm, Secret: render.ViewKeySecret(x.ViewKeySeed, v.ID)}
 }
+
+// GeneratedStatements lists what Jarl adds to named.conf by itself
+// (render.GeneratedStatements).
+func (e *Engine) GeneratedStatements(ctx context.Context, st *model.State) []render.Generated {
+	return render.GeneratedStatements(st, e.cfg.Paths, e.extras(ctx))
+}

internal/mailcheck/mailcheck.go

@@ -0,0 +1,339 @@
+// Package mailcheck checks the reverse DNS of the addresses that send and
+// receive mail for your public zones (docs/exposure.md#mail): receivers
+// such as Gmail and Outlook reject or mark mail from an address without a
+// PTR record, or whose PTR name doesn't resolve back to it. Those records
+// belong to whoever owns the address (your hosting provider or ISP), not
+// to Jarl, so the check asks the internet and says who to ask.
+package mailcheck
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/netip"
+	"slices"
+	"strings"
+	"time"
+
+	"github.com/miekg/dns"
+	"golang.org/x/net/publicsuffix"
+
+	"jarl/internal/model"
+)
+
+// Target is an address mail comes from or goes to, and why it is checked.
+type Target struct {
+	Zone    string   `json:"zone"`
+	Address string   `json:"address"`
+	Roles   []string `json:"roles"`          // e.g. "MX mail.adbraun.lol", "SPF ip4"
+	Host    string   `json:"host,omitempty"` // the MX host name, when it is one
+}
+
+// Result is the check of one address.
+type Result struct {
+	Target
+	PTR []string `json:"ptr"` // the names its PTR records give
+	// OK: a PTR name resolves back to the address (forward-confirmed).
+	OK bool `json:"ok"`
+	// Level is ok, info or warning; Message says what to do.
+	Level   string `json:"level"`
+	Message string `json:"message"`
+	// ReverseZone and ManagedBy say where the PTR record lives.
+	ReverseZone string `json:"reverse_zone,omitempty"`
+	ManagedBy   string `json:"managed_by,omitempty"`
+	// LocalZone is a reverse zone for the address in Jarl ("view/zone"),
+	// which the internet doesn't ask unless the address's owner delegated
+	// it to this server.
+	LocalZone string `json:"local_zone,omitempty"`
+}
+
+// Report is a whole check.
+type Report struct {
+	Checked time.Time `json:"checked"`
+	Results []Result  `json:"results"`
+	// Errors are lookups that failed (no internet, say).
+	Errors []string `json:"errors,omitempty"`
+}
+
+// Targets finds the addresses to check in the public zones: the MX hosts
+// (receiving) and the SPF record's addresses (sending). Names are looked
+// up later, through the resolver.
+func Targets(st *model.State, public func(viewID int64) bool) (addrs []Target, names []Target) {
+	for _, z := range st.SortedZones() {
+		if z.Type != model.ZonePrimary || z.Disabled || !public(z.ViewID) {
+			continue
+		}
+		zone := strings.TrimSuffix(z.Name, ".")
+		for _, r := range st.ZoneRecords(z.ID) {
+			if r.Name != z.Name || r.Disabled {
+				continue
+			}
+			switch r.Type {
+			case "MX":
+				f := strings.Fields(r.Data)
+				if len(f) == 2 && f[1] != "." {
+					names = append(names, Target{Zone: zone, Host: strings.TrimSuffix(strings.ToLower(f[1]), "."), Roles: []string{"MX " + strings.TrimSuffix(f[1], ".")}})
+				}
+			case "TXT":
+				text := strings.ReplaceAll(strings.ReplaceAll(r.Data, `" "`, ""), `"`, "")
+				if !strings.HasPrefix(strings.ToLower(text), "v=spf1") {
+					continue
+				}
+				for _, mech := range strings.Fields(text)[1:] {
+					m := strings.ToLower(strings.TrimLeft(mech, "+?~"))
+					switch {
+					case strings.HasPrefix(m, "ip4:"), strings.HasPrefix(m, "ip6:"):
+						v := m[4:]
+						p, err := netip.ParsePrefix(v)
+						if err != nil {
+							if a, err := netip.ParseAddr(v); err == nil {
+								p = netip.PrefixFrom(a, a.BitLen())
+							} else {
+								continue
+							}
+						}
+						if p.IsSingleIP() {
+							addrs = append(addrs, Target{Zone: zone, Address: p.Addr().String(), Roles: []string{"SPF " + m[:3]}})
+						}
+					case m == "a":
+						names = append(names, Target{Zone: zone, Host: zone, Roles: []string{"SPF a"}})
+					case strings.HasPrefix(m, "a:"):
+						names = append(names, Target{Zone: zone, Host: strings.TrimSuffix(m[2:], "."), Roles: []string{"SPF " + m}})
+					}
+				}
+			}
+		}
+	}
+	return addrs, names
+}
+
+// Resolver asks recursive resolvers (the public ones of acme.resolvers).
+type Resolver struct {
+	Servers []string
+	Timeout time.Duration
+}
+
+func (r Resolver) query(ctx context.Context, name string, qtype uint16) (*dns.Msg, error) {
+	if len(r.Servers) == 0 {
+		return nil, errors.New("no resolvers configured (acme.resolvers)")
+	}
+	m := new(dns.Msg)
+	m.SetQuestion(dns.Fqdn(name), qtype)
+	m.RecursionDesired = true
+	m.SetEdns0(1232, false)
+	t := r.Timeout
+	if t == 0 {
+		t = 5 * time.Second
+	}
+	var last error
+	for _, s := range r.Servers {
+		in, _, err := (&dns.Client{Timeout: t}).ExchangeContext(ctx, m, s)
+		if err == nil && in.Truncated {
+			in, _, err = (&dns.Client{Timeout: t, Net: "tcp"}).ExchangeContext(ctx, m, s)
+		}
+		if err == nil && in.Rcode != dns.RcodeServerFailure && in.Rcode != dns.RcodeRefused {
+			return in, nil
+		}
+		if err != nil {
+			last = fmt.Errorf("%s: %w", s, err)
+		} else {
+			last = fmt.Errorf("%s answered %s", s, dns.RcodeToString[in.Rcode])
+		}
+	}
+	return nil, fmt.Errorf("looking up %s %s: %w", strings.TrimSuffix(name, "."), dns.TypeToString[qtype], last)
+}
+
+// addresses returns a name's A and AAAA addresses (after CNAMEs).
+func (r Resolver) addresses(ctx context.Context, name string) ([]netip.Addr, bool, error) {
+	var out []netip.Addr
+	alias := false
+	for _, t := range []uint16{dns.TypeA, dns.TypeAAAA} {
+		in, err := r.query(ctx, name, t)
+		if err != nil {
+			return nil, false, err
+		}
+		for _, rr := range in.Answer {
+			switch v := rr.(type) {
+			case *dns.A:
+				a, _ := netip.AddrFromSlice(v.A.To4())
+				out = append(out, a)
+			case *dns.AAAA:
+				a, _ := netip.AddrFromSlice(v.AAAA)
+				out = append(out, a)
+			case *dns.CNAME:
+				alias = true
+			}
+		}
+	}
+	return out, alias, nil
+}
+
+// Check looks up every target's reverse DNS.
+func Check(ctx context.Context, st *model.State, public func(int64) bool, res Resolver) *Report {
+	rep := &Report{Checked: time.Now(), Results: []Result{}}
+	addrs, names := Targets(st, public)
+	// Names to addresses, as the internet sees them.
+	for _, n := range names {
+		as, _, err := res.addresses(ctx, n.Host)
+		if err != nil {
+			rep.Errors = append(rep.Errors, err.Error())
+			continue
+		}
+		if len(as) == 0 {
+			rep.Errors = append(rep.Errors, fmt.Sprintf("%s (%s, %s) has no address as the internet sees it: not published yet, or a typo?", n.Host, n.Zone, strings.Join(n.Roles, ", ")))
+		}
+		for _, a := range as {
+			t := n
+			t.Address = a.String()
+			addrs = append(addrs, t)
+		}
+	}
+	// One result per address, with every reason it is checked.
+	merged := map[string]*Target{}
+	var order []string
+	for _, t := range addrs {
+		k := t.Zone + "|" + t.Address
+		if m := merged[k]; m != nil {
+			for _, role := range t.Roles {
+				if !slices.Contains(m.Roles, role) {
+					m.Roles = append(m.Roles, role)
+				}
+			}
+			if m.Host == "" {
+				m.Host = t.Host
+			}
+			continue
+		}
+		t := t
+		merged[k] = &t
+		order = append(order, k)
+	}
+	for _, k := range order {
+		r := checkOne(ctx, *merged[k], res)
+		r.LocalZone = localReverse(st, r.Address, r.ReverseZone)
+		rep.Results = append(rep.Results, r)
+	}
+	return rep
+}
+
+// localReverse returns a reverse zone in Jarl that covers the address,
+// unless it is the zone the internet asks (delegated to this server).
+func localReverse(st *model.State, addr, internetZone string) string {
+	rev, err := dns.ReverseAddr(addr)
+	if err != nil {
+		return ""
+	}
+	rev = strings.ToLower(rev)
+	best := ""
+	var bz *model.Zone
+	for _, z := range st.SortedZones() {
+		n := strings.ToLower(dns.Fqdn(z.Name))
+		if z.Type == model.ZonePrimary && dns.IsSubDomain(n, rev) && len(n) > len(best) {
+			best, bz = n, z
+		}
+	}
+	if bz == nil || strings.EqualFold(strings.TrimSuffix(best, "."), internetZone) {
+		return ""
+	}
+	if v := st.ViewName(bz); v != "" {
+		return v + "/" + strings.TrimSuffix(bz.Name, ".")
+	}
+	return strings.TrimSuffix(bz.Name, ".")
+}
+
+func checkOne(ctx context.Context, t Target, res Resolver) Result {
+	r := Result{Target: t, PTR: []string{}}
+	a, err := netip.ParseAddr(t.Address)
+	if err != nil {
+		r.Level, r.Message = "warning", err.Error()
+		return r
+	}
+	rev, _ := dns.ReverseAddr(a.String())
+	in, err := res.query(ctx, rev, dns.TypePTR)
+	if err != nil {
+		r.Level, r.Message = "warning", err.Error()
+		return r
+	}
+	// Who manages the reverse zone: the SOA in the answer.
+	for _, sec := range [][]dns.RR{in.Ns, in.Answer} {
+		for _, rr := range sec {
+			if soa, ok := rr.(*dns.SOA); ok {
+				r.ReverseZone, r.ManagedBy = strings.TrimSuffix(soa.Hdr.Name, "."), managedBy(soa.Ns)
+			}
+		}
+	}
+	if r.ReverseZone == "" {
+		if s, err := res.query(ctx, rev, dns.TypeSOA); err == nil {
+			for _, sec := range [][]dns.RR{s.Answer, s.Ns} {
+				for _, rr := range sec {
+					if soa, ok := rr.(*dns.SOA); ok {
+						r.ReverseZone, r.ManagedBy = strings.TrimSuffix(soa.Hdr.Name, "."), managedBy(soa.Ns)
+					}
+				}
+			}
+		}
+	}
+	for _, rr := range in.Answer {
+		if p, ok := rr.(*dns.PTR); ok {
+			r.PTR = append(r.PTR, strings.TrimSuffix(strings.ToLower(p.Ptr), "."))
+		}
+	}
+	where := "whoever runs the address's reverse zone (your hosting provider or ISP)"
+	if r.ManagedBy != "" {
+		where = "the reverse zone's owner (" + r.ManagedBy + ": your hosting provider's or ISP's panel)"
+	}
+	if len(r.PTR) == 0 {
+		r.Level = "warning"
+		r.Message = fmt.Sprintf("%s has no PTR record: many receivers reject or mark mail from it. Set its reverse DNS to %s at %s", t.Address, suggestName(t), where)
+		return r
+	}
+	var notes []string
+	for _, name := range r.PTR {
+		as, alias, err := res.addresses(ctx, name)
+		if err != nil {
+			notes = append(notes, err.Error())
+			continue
+		}
+		if slices.Contains(as, a) {
+			r.OK = true
+			if alias {
+				notes = append(notes, name+" is an alias (CNAME): receivers expect the PTR to name a host with its own A/AAAA record")
+			}
+			if t.Host != "" && name != t.Host && strings.HasPrefix(strings.Join(t.Roles, " "), "MX") {
+				notes = append(notes, fmt.Sprintf("the PTR name is %s, not the MX name %s: fine if the mail server says %s in HELO", name, t.Host, name))
+			}
+		}
+	}
+	switch {
+	case !r.OK:
+		r.Level = "warning"
+		r.Message = fmt.Sprintf("the PTR record of %s names %s, which doesn't resolve back to %s: receivers check that it does. Point the PTR at a name with an A/AAAA record for %s (set at %s), or add that record", t.Address, strings.Join(r.PTR, ", "), t.Address, t.Address, where)
+	case len(notes) > 0:
+		r.Level, r.Message = "info", strings.Join(notes, "; ")
+	default:
+		r.Level, r.Message = "ok", fmt.Sprintf("%s → %s → %s", t.Address, strings.Join(r.PTR, ", "), t.Address)
+	}
+	return r
+}
+
+func suggestName(t Target) string {
+	if t.Host != "" {
+		return t.Host
+	}
+	return "the host's name (with an A/AAAA record for it)"
+}
+
+// managedBy turns the reverse zone's primary name server into its owner's
+// domain: ns1.linode.com -> linode.com, dns0.zen.co.uk -> zen.co.uk.
+func managedBy(ns string) string {
+	ns = strings.TrimSuffix(strings.ToLower(ns), ".")
+	labels := strings.Split(ns, ".")
+	// The registered domain under the ICANN suffix: the list's private
+	// part (members.linode.com) names customers, not the provider.
+	for i := 1; i < len(labels); i++ {
+		if suffix, icann := publicsuffix.PublicSuffix(strings.Join(labels[i:], ".")); icann && suffix == strings.Join(labels[i:], ".") {
+			return strings.Join(labels[i-1:], ".")
+		}
+	}
+	return ns
+}

internal/mailcheck/mailcheck_test.go

@@ -0,0 +1,108 @@
+package mailcheck
+
+import (
+	"context"
+	"net"
+	"strings"
+	"testing"
+
+	"github.com/miekg/dns"
+
+	"jarl/internal/model"
+)
+
+// fakeResolver answers from a fixed set of records, as a recursive
+// resolver would, with the reverse zone's SOA in negative answers.
+func fakeResolver(t *testing.T, records ...string) string {
+	t.Helper()
+	var rrs []dns.RR
+	for _, s := range records {
+		rr, err := dns.NewRR(s)
+		if err != nil {
+			t.Fatal(err)
+		}
+		rrs = append(rrs, rr)
+	}
+	soa, _ := dns.NewRR("2.0.192.in-addr.arpa. 3600 IN SOA ns1.linode.com. hostmaster.linode.com. 1 3600 900 1209600 300")
+	pc, err := net.ListenPacket("udp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	srv := &dns.Server{PacketConn: pc, Handler: dns.HandlerFunc(func(w dns.ResponseWriter, q *dns.Msg) {
+		m := new(dns.Msg)
+		m.SetReply(q)
+		qn := strings.ToLower(q.Question[0].Name)
+		for _, rr := range rrs {
+			if strings.ToLower(rr.Header().Name) == qn && (rr.Header().Rrtype == q.Question[0].Qtype || rr.Header().Rrtype == dns.TypeCNAME) {
+				m.Answer = append(m.Answer, rr)
+			}
+		}
+		if len(m.Answer) == 0 && dns.IsSubDomain(soa.Header().Name, qn) {
+			if q.Question[0].Qtype == dns.TypeSOA && qn == soa.Header().Name {
+				m.Answer = append(m.Answer, soa)
+			} else {
+				m.Ns = append(m.Ns, soa)
+			}
+		}
+		w.WriteMsg(m)
+	})}
+	go srv.ActivateAndServe()
+	t.Cleanup(func() { srv.Shutdown() })
+	return pc.LocalAddr().String()
+}
+
+func TestCheck(t *testing.T) {
+	st := model.NewState()
+	ext := &model.View{ID: 1, Name: "external", MatchClients: []string{"any"}}
+	in := &model.View{ID: 2, Name: "internal", MatchClients: []string{"lan"}}
+	st.Views[1], st.Views[2] = ext, in
+	z := &model.Zone{ID: 10, Name: "example.com.", ViewID: 1, Type: model.ZonePrimary}
+	zi := &model.Zone{ID: 11, Name: "example.com.", ViewID: 2, Type: model.ZonePrimary}
+	rev := &model.Zone{ID: 12, Name: "27.2.0.192.in-addr.arpa.", ViewID: 2, Type: model.ZonePrimary}
+	st.Zones[10], st.Zones[11], st.Zones[12] = z, zi, rev
+	rec := func(id, zone int64, name, typ, data string) {
+		st.Records[id] = &model.Record{ID: id, ZoneID: zone, Name: name, Type: typ, Data: data}
+	}
+	rec(1, 10, "example.com.", "MX", "10 mail.example.com.")
+	rec(2, 10, "example.com.", "TXT", `"v=spf1 mx ip4:192.0.2.26 ip4:192.0.2.27" " ip4:198.51.100.0/24 -all"`)
+	rec(3, 10, "www.example.com.", "MX", "10 ignored.example.com.") // not the apex
+	rec(4, 11, "example.com.", "MX", "10 internal.example.com.")    // private view
+	rec(5, 10, "example.com.", "TXT", `"google-site-verification=x"`)
+	rec(6, 10, "example.com.", "MX", "20 backup.example.com.") // not on the internet
+
+	res := Resolver{Servers: []string{fakeResolver(t,
+		"mail.example.com. 300 IN A 192.0.2.25",
+		"25.2.0.192.in-addr.arpa. 300 IN PTR mail.example.com.",
+		"27.2.0.192.in-addr.arpa. 300 IN PTR li-27.members.linode.com.",
+		"li-27.members.linode.com. 300 IN A 192.0.2.99",
+	)}}
+	public := func(id int64) bool { return id == 1 }
+	rep := Check(context.Background(), st, public, res)
+	if len(rep.Errors) != 1 || !strings.Contains(rep.Errors[0], "backup.example.com (example.com, MX backup.example.com) has no address") {
+		t.Fatalf("errors %v", rep.Errors)
+	}
+	got := map[string]Result{}
+	for _, r := range rep.Results {
+		got[r.Address] = r
+	}
+	if len(got) != 3 {
+		t.Fatalf("results %+v", rep.Results)
+	}
+	if r := got["192.0.2.25"]; !r.OK || r.Level != "ok" || r.Roles[0] != "MX mail.example.com" || r.ManagedBy != "" && r.ManagedBy != "linode.com" {
+		t.Errorf("mail: %+v", r)
+	}
+	if r := got["192.0.2.26"]; r.OK || r.Level != "warning" || !strings.Contains(r.Message, "no PTR record") || r.ManagedBy != "linode.com" || r.ReverseZone != "2.0.192.in-addr.arpa" {
+		t.Errorf("no PTR: %+v", r)
+	}
+	if r := got["192.0.2.27"]; r.OK || !strings.Contains(r.Message, "doesn't resolve back") || r.LocalZone != "internal/27.2.0.192.in-addr.arpa" {
+		t.Errorf("not forward-confirmed: %+v", r)
+	}
+}
+
+func TestManagedBy(t *testing.T) {
+	for in, want := range map[string]string{"ns1.linode.com.": "linode.com", "dns0.zen.co.uk.": "zen.co.uk", "ns1.members.linode.com.": "linode.com", "localhost.": "localhost"} {
+		if got := managedBy(in); got != want {
+			t.Errorf("managedBy(%q) = %q, want %q", in, got, want)
+		}
+	}
+}

internal/namedconf/printer.go

@@ -182,3 +182,38 @@ func writeItemsInline(sb *strings.Builder, items []Item) {
 		}
 	}
 }
+
+// FormatValueList is FormatValue, except that a value whose block is a
+// plain list (no nested blocks) of at least min elements is laid out one
+// element per line, for reading: allow-query, exempt-clients, forwarders.
+func FormatValueList(name, value string, min int) string {
+	st, err := ParseOptionValue(name, value)
+	if err != nil {
+		return FormatValue(name, value)
+	}
+	items := st.Items[1:]
+	blocks := 0
+	var list *Block
+	for _, it := range items {
+		if it.Block != nil {
+			blocks++
+			list = it.Block
+		}
+	}
+	if blocks != 1 || len(list.Stmts) < min || blockHasBlocks(list) {
+		return FormatValue(name, value)
+	}
+	var sb strings.Builder
+	for _, it := range items {
+		if it.Block == nil {
+			sb.WriteString(Compact([]Item{it}) + " ")
+			continue
+		}
+		sb.WriteString("{\n")
+		for _, s := range list.Stmts {
+			sb.WriteString("\t" + Compact(s.Items) + ";\n")
+		}
+		sb.WriteString("} ")
+	}
+	return strings.TrimSpace(sb.String())
+}

internal/namedconf/printer_test.go

@@ -16,3 +16,23 @@ func TestFormatValue(t *testing.T) {
 		}
 	}
 }
+
+func TestFormatValueList(t *testing.T) {
+	cases := []struct{ name, value, want string }{
+		{"allow-query", "{ homelab; localhost; 10.0.0.0/8; }", "{\n\thomelab;\n\tlocalhost;\n\t10.0.0.0/8;\n}"},
+		{"allow-query", "{ homelab; localhost; }", "{ homelab; localhost; }"}, // short: as it was
+		{"listen-on", "port 853 tls dot { 10.0.0.1; 10.0.0.2; 10.0.0.3; }", "port 853 tls dot {\n\t10.0.0.1;\n\t10.0.0.2;\n\t10.0.0.3;\n}"},
+		{"allow-transfer", "{ !10.0.0.9; key xfer; 10.0.0.0/8; }", "{\n\t!10.0.0.9;\n\tkey xfer;\n\t10.0.0.0/8;\n}"},
+		{"recursion", "yes", "yes"},
+	}
+	for _, c := range cases {
+		if got := FormatValueList(c.name, c.value, 3); got != c.want {
+			t.Errorf("%s %q:\n got %q\nwant %q", c.name, c.value, got, c.want)
+		}
+	}
+	// A nested block (rate-limit with exempt-clients) keeps FormatValue's layout.
+	v := "{ responses-per-second 10; log-only yes; exempt-clients { 192.0.2.1; 192.0.2.2; 192.0.2.3; }; }"
+	if got := FormatValueList("rate-limit", v, 3); got != FormatValue("rate-limit", v) {
+		t.Errorf("nested: %q", got)
+	}
+}

internal/render/generated.go

@@ -0,0 +1,142 @@
+package render
+
+import (
+	"strings"
+
+	"jarl/internal/model"
+	"jarl/internal/namedconf"
+)
+
+// Generated is a statement Jarl adds to named's configuration by itself,
+// not from an option you set: why, and what controls it.
+type Generated struct {
+	Where   string `json:"where"`   // top level, options, or "view NAME"
+	Text    string `json:"text"`    // as written in named.conf
+	Why     string `json:"why"`     // what it is for
+	Setting string `json:"setting"` // what turns it on or off
+}
+
+// GeneratedStatements lists what Render adds to named.conf beyond the
+// options in the database, so nothing there comes as a surprise.
+func GeneratedStatements(s *model.State, p Paths, x Extras) []Generated {
+	var out []Generated
+	add := func(where, text, why, setting string) {
+		out = append(out, Generated{Where: where, Text: strings.TrimRight(text, "\n"), Why: why, Setting: setting})
+	}
+	add("top level", "include "+namedconf.QuoteString(p.KeysConfig())+";",
+		"TSIG keys (and the view keys) live in their own file, which only named and jarld can read", "always")
+	st := x.Stats
+	logResponses := st != nil && st.LogFile != ""
+	pzs := PolicyZones(s, p)
+	if st != nil {
+		_, user := findTop(s, "statistics-channels")
+		why := "named publishes its counters for jarld's query statistics, on a loopback address only"
+		if user {
+			why += " (added to your statistics-channels statement)"
+		}
+		add("top level", formatStmt(namedconf.NewStmt("statistics-channels", namedconf.NewBlock(st.statsInet())), 0), why, "stats.enabled in jarl.yaml")
+	}
+	if logResponses {
+		b := namedconf.NewBlock(st.logChannel())
+		cat := func(name string, extra ...string) {
+			ch := namedconf.NewBlock(namedconf.NewStmt(StatsChannelName))
+			for _, e := range extra {
+				ch.Stmts = append(ch.Stmts, namedconf.NewStmt(e))
+			}
+			b.Stmts = append(b.Stmts, namedconf.NewStmt("category", name, ch))
+		}
+		why := []string{"responses: every answer, for the statistics' names, clients and views"}
+		cat("responses")
+		if len(pzs) > 0 {
+			cat("rpz")
+			why = append(why, "rpz: what blocking blocked")
+		}
+		if logRateLimit(s, st) {
+			cat("query-errors", "default_syslog")
+			why = append(why, "query-errors: what rate limiting limited, or would in log-only mode, for the Exposure page (also to syslog, as before)")
+		}
+		w := "named logs to a file jarld reads (" + strings.Join(why, "; ") + ")"
+		if _, user := findTop(s, "logging"); user {
+			w += "; merged into your logging statement"
+		}
+		setting := "stats.query_log in jarl.yaml"
+		if logRateLimit(s, st) || hasRateLimit(s) {
+			setting += "; query-errors: stats.rate_limit_log"
+		}
+		add("top level", formatStmt(namedconf.NewStmt("logging", b), 0), w, setting)
+		if s.FindOption(model.ScopeOptions, 0, "responselog") == nil {
+			add("options", "responselog yes;", "named logs answers from the start, for the statistics", "stats.query_log in jarl.yaml")
+		}
+	}
+	views := s.OrderedViews()
+	scopes := []struct {
+		id   int64
+		name string
+	}{{0, "options"}}
+	if len(views) > 0 {
+		scopes = scopes[:0]
+		for _, v := range views {
+			scopes = append(scopes, struct {
+				id   int64
+				name string
+			}{v.ID, "view " + v.Name})
+		}
+	}
+	for _, sc := range scopes {
+		zs := scopeZones(pzs, sc.id)
+		if len(zs) == 0 {
+			continue
+		}
+		w := newConfWriter()
+		writeResponsePolicy(w, zs, logResponses)
+		writePolicyZones(w, s, zs, &Output{}, 0)
+		add(sc.name, dedent(w.sb.String()), "blocking: your rules and blocklists, as response policy zones named loads", "the Blocking page (jarl block, jarl blocklist)")
+	}
+	if viewKeysOn(s, Extras{ViewKeySeed: x.ViewKeySeed}) {
+		for _, v := range views {
+			mc := viewMatchClients(s, x, v)
+			var keys []string
+			for _, e := range mc {
+				if strings.Contains(e, "key ") {
+					keys = append(keys, e+";")
+				}
+			}
+			add("view "+v.Name, "match-clients { "+strings.Join(keys, " ")+" ... };",
+				"view keys: a query signed with a view's key gets that view, from any address, and never another view (jarl view key)", "always, when there are views")
+		}
+	}
+	return out
+}
+
+func findTop(s *model.State, name string) (*model.Option, bool) {
+	for _, o := range s.ScopedOptions(model.ScopeTopLevel, 0) {
+		if o.Name == name {
+			return o, true
+		}
+	}
+	return nil, false
+}
+
+func hasRateLimit(s *model.State) bool {
+	for _, o := range s.Options {
+		if o.Name == "rate-limit" {
+			return true
+		}
+	}
+	return false
+}
+
+// logRateLimit reports whether rate limiting's log lines go to the
+// response log (docs/exposure.md).
+func logRateLimit(s *model.State, st *StatsHooks) bool {
+	return st != nil && st.LogFile != "" && !st.NoRateLimitLog && hasRateLimit(s)
+}
+
+// dedent removes one leading tab from every line.
+func dedent(s string) string {
+	lines := strings.Split(s, "\n")
+	for i, l := range lines {
+		lines[i] = strings.TrimPrefix(l, "\t")
+	}
+	return strings.Join(lines, "\n")
+}

internal/render/render.go

@@ -274,10 +274,7 @@ func renderConfig(s *model.State, p Paths, x Extras, out *Output) (string, []Spa
 	logRewrites := logResponses && len(pzs) > 0
 	// Rate limiting logs what it limits (or would, in log-only mode) as
 	// query-errors; the statistics count it (docs/exposure.md).
-	logRRL := false
-	for _, o := range s.Options {
-		logRRL = logRRL || logResponses && o.Name == "rate-limit"
-	}
+	logRRL := logRateLimit(s, st)
 	sawStats, sawLogging := false, false
 	if top := s.ScopedOptions(model.ScopeTopLevel, 0); len(top) > 0 {
 		w.write("\n")

internal/render/stats.go

@@ -26,6 +26,9 @@ type StatsHooks struct {
 	LogFile     string         // response log; "" disables response logging
 	LogVersions int
 	LogSize     string
+	// NoRateLimitLog keeps rate limiting's log lines (category
+	// query-errors) out of the response log (stats.rate_limit_log: false).
+	NoRateLimitLog bool
 }
 
 // StatsChannelName is the logging channel Jarl adds for responses.

internal/render/stats_test.go

@@ -82,3 +82,45 @@ func TestStatsHooksMerged(t *testing.T) {
 func TestStatsHooksWithNamed(t *testing.T) {
 	checkWithNamed(t, sampleState(t), Extras{Stats: statsHooks()})
 }
+
+// Rate limiting's log lines go to the response log unless
+// stats.rate_limit_log is off; the list of what Jarl adds says so.
+func TestRateLimitLogAndGenerated(t *testing.T) {
+	s := sampleState(t)
+	for id, o := range s.Options {
+		if o.Name == "logging" {
+			delete(s.Options, id)
+		}
+	}
+	s.Options[20000] = &model.Option{ID: 20000, Scope: model.ScopeOptions, Name: "rate-limit", Value: "{ responses-per-second 10; log-only yes; }", Position: 20000}
+	p := Paths{ConfigDir: "/etc/bind/jarl", ZoneDir: "/var/lib/bind/jarl", CacheDir: "/var/cache/bind/jarl"}
+	conf := string(Render(s, p, Extras{Stats: statsHooks()}).File(p.MainConfig()).Content)
+	if !strings.Contains(conf, "category query-errors { jarl_responses; default_syslog; };") {
+		t.Errorf("query-errors not logged:\n%s", conf)
+	}
+	gen := GeneratedStatements(s, p, Extras{Stats: statsHooks()})
+	var logging *Generated
+	for i := range gen {
+		if strings.HasPrefix(gen[i].Text, "logging") {
+			logging = &gen[i]
+		}
+	}
+	if logging == nil || !strings.Contains(logging.Text, "query-errors") || !strings.Contains(logging.Setting, "stats.rate_limit_log") {
+		t.Errorf("generated logging = %+v (all %+v)", logging, gen)
+	}
+	if !strings.HasPrefix(gen[0].Text, "include ") || gen[0].Where != "top level" {
+		t.Errorf("first generated = %+v", gen[0])
+	}
+
+	h := statsHooks()
+	h.NoRateLimitLog = true
+	conf = string(Render(s, p, Extras{Stats: h}).File(p.MainConfig()).Content)
+	if strings.Contains(conf, "query-errors") || !strings.Contains(conf, "category responses") {
+		t.Errorf("rate_limit_log off but query-errors logged:\n%s", conf)
+	}
+	for _, g := range GeneratedStatements(s, p, Extras{Stats: h}) {
+		if strings.Contains(g.Text, "query-errors") {
+			t.Errorf("listed while off: %+v", g)
+		}
+	}
+}

internal/server/h_changes.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"net/http"
 	"strconv"
 	"time"
@@ -285,6 +286,20 @@ func (s *Server) status(w http.ResponseWriter, r *http.Request, p *auth.Principa
 		resp.TOTP = s.totpOverview(r.Context())
 		resp.Certificates = s.certSummary(r.Context())
 	}
+	if p.Can(auth.Action{Resource: auth.ResOptions}) {
+		if h := s.encryptedDNSHealth(); h != nil {
+			sum := &api.EncDNSSummary{Checked: h.Checked, OK: h.OK(), Problems: []string{}, Warnings: []string{}}
+			for _, pr := range h.Probes {
+				where := fmt.Sprintf("%s on %s port %d", map[string]string{"dot": "DNS over TLS", "doh": "DNS over HTTPS"}[pr.Kind], pr.Address, pr.Port)
+				if pr.Problem != "" {
+					sum.Problems = append(sum.Problems, where+": "+pr.Problem)
+				} else if pr.Warning != "" {
+					sum.Warnings = append(sum.Warnings, where+": "+pr.Warning)
+				}
+			}
+			resp.EncryptedDNS = sum
+		}
+	}
 	if p.Can(auth.Action{Resource: auth.ResBlocking}) {
 		resp.BlocklistErrors = s.blocklistErrors(r.Context())
 		if st, err := s.store.LoadState(r.Context()); err == nil {

internal/server/h_compare.go

@@ -0,0 +1,89 @@
+package server
+
+import (
+	"net/http"
+	"strings"
+
+	"jarl/internal/auth"
+	"jarl/internal/engine"
+	"jarl/internal/model"
+)
+
+// zoneCompare: GET /zones/{zone}/compare lines up a zone's records across
+// the views that have it (docs/views.md#linked-zones). ?views=a,b picks the
+// views (default: every view with a primary zone of that name), ?all=1
+// includes the names and types that are the same everywhere.
+func (s *Server) zoneCompare(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	st, err := s.state(r)
+	if err != nil {
+		return err
+	}
+	z, err := s.zoneByPath(r, st, p)
+	if err != nil {
+		// A name in several views is what there is to compare.
+		ref := r.PathValue("zone")
+		if ref == "root" {
+			ref = "."
+		}
+		name, perr := engine.ParseZoneName(ref)
+		if zs := st.ZonesNamed(name); perr != nil || len(zs) < 2 {
+			return err
+		} else {
+			z = zs[0]
+		}
+	}
+	var want []string
+	for _, v := range strings.Split(r.URL.Query().Get("views"), ",") {
+		if v = strings.TrimSpace(v); v != "" {
+			want = append(want, v)
+		}
+	}
+	var zones []*model.Zone
+	for _, o := range st.ZonesNamed(z.Name) {
+		vn := st.ViewName(o)
+		if o.Type != model.ZonePrimary || !p.CanSeeZone(o.Name, vn) || !p.Can(auth.Action{Resource: auth.ResRecords, Zone: o.Name, View: vn}) {
+			continue
+		}
+		if len(want) > 0 && !containsFold(want, vn) {
+			continue
+		}
+		zones = append(zones, o)
+	}
+	st.SortByView(zones)
+	if len(zones) < 2 {
+		return badRequest("zone %s is in only one view (that you may read): there is nothing to compare", engine.Display(z.Name))
+	}
+	rows := engine.CompareZones(st, zones)
+	all := queryBool(r, "all")
+	out := struct {
+		Zone   string              `json:"zone"`
+		Views  []string            `json:"views"`
+		Linked bool                `json:"linked"` // all of them in one link
+		Same   int                 `json:"same"`   // names and types the same everywhere
+		Rows   []engine.CompareRow `json:"rows"`
+	}{Zone: engine.Display(z.Name), Rows: []engine.CompareRow{}, Linked: true}
+	for _, o := range zones {
+		out.Views = append(out.Views, st.ViewName(o))
+		out.Linked = out.Linked && o.LinkGroup != 0 && o.LinkGroup == zones[0].LinkGroup
+	}
+	for _, row := range rows {
+		if row.Same {
+			out.Same++
+			if !all {
+				continue
+			}
+		}
+		out.Rows = append(out.Rows, row)
+	}
+	writeJSON(w, http.StatusOK, out)
+	return nil
+}
+
+func containsFold(list []string, s string) bool {
+	for _, x := range list {
+		if strings.EqualFold(x, s) {
+			return true
+		}
+	}
+	return false
+}

internal/server/h_config.go

@@ -659,3 +659,22 @@ func (s *Server) search(w http.ResponseWriter, r *http.Request, p *auth.Principa
 	writeJSON(w, http.StatusOK, out)
 	return nil
 }
+
+// generatedOptions: GET /options/generated lists what Jarl adds to
+// named.conf by itself (the statistics channel, its logging, blocking's
+// response-policy, view keys), with why and what controls it.
+func (s *Server) generatedOptions(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	if err := require(p, auth.Action{Resource: auth.ResOptions}); err != nil {
+		return err
+	}
+	st, err := s.store.LoadState(r.Context())
+	if err != nil {
+		return err
+	}
+	out := s.eng.GeneratedStatements(r.Context(), st)
+	if out == nil {
+		out = []render.Generated{}
+	}
+	writeJSON(w, http.StatusOK, out)
+	return nil
+}

internal/server/h_encdns.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"context"
 	"net/http"
 	"net/netip"
 	"slices"
@@ -43,6 +44,8 @@ type encStatus struct {
 	// DoTHost and DoHURL are what to give clients.
 	DoTHost string `json:"dot_host,omitempty"`
 	DoHURL  string `json:"doh_url,omitempty"`
+	// Health is the last check of the listeners (every 10 minutes).
+	Health *encdns.Health `json:"health,omitempty"`
 	// For the setup form.
 	Addresses    []encAddress `json:"addresses"`
 	Views        []encView    `json:"views"`
@@ -104,6 +107,9 @@ func (s *Server) encryptedDNS(w http.ResponseWriter, r *http.Request, p *auth.Pr
 			out.DoHURL += "/dns-query"
 		}
 	}
+	if out.Enabled {
+		out.Health = s.encryptedDNSHealth()
+	}
 	seen := map[netip.Addr]bool{}
 	for _, a := range localAddrs() {
 		a = a.Unmap()
@@ -234,3 +240,81 @@ func (s *Server) encryptedDNSDisable(w http.ResponseWriter, r *http.Request, p *
 	}
 	return s.mutate(w, r, p, "turn DNS over TLS and HTTPS off", reqs, nil)
 }
+
+// encTarget returns the host name clients connect to and the serial of
+// the certificate Jarl last wrote for named.
+func (s *Server) encTarget(ctx context.Context, st encdns.Status) (host, serial string) {
+	if s.cfg.Certs == nil || st.Certificate == "" {
+		return "", ""
+	}
+	c, err := s.cfg.Certs.Get(ctx, st.Certificate)
+	if err != nil {
+		return "", ""
+	}
+	for _, n := range append(c.Names, c.Domains...) {
+		if !strings.HasPrefix(n, "*.") {
+			host = n
+			break
+		}
+	}
+	return host, c.Serial
+}
+
+// checkEncryptedDNS checks the DoT and DoH listeners as a client would and
+// keeps the result; a change for the worse is logged.
+func (s *Server) checkEncryptedDNS(ctx context.Context) *encdns.Health {
+	if s.cfg.Certs == nil {
+		return nil
+	}
+	state, err := s.store.LoadState(ctx)
+	if err != nil {
+		return nil
+	}
+	st := encdns.GetStatus(state, s.cfg.Certs.FilesDir(""))
+	var h *encdns.Health
+	if st.Enabled {
+		if host, serial := s.encTarget(ctx, st); host != "" {
+			h = encdns.Check(ctx, st, host, serial, s.encRoots)
+		}
+	}
+	s.encHealth.Lock()
+	prev := s.encHealth.h
+	s.encHealth.h = h
+	s.encHealth.Unlock()
+	if h != nil {
+		for _, p := range h.Probes {
+			if p.OK {
+				continue
+			}
+			was := false
+			if prev != nil {
+				for _, q := range prev.Probes {
+					was = was || q.Kind == p.Kind && q.Address == p.Address && q.Port == p.Port && !q.OK
+				}
+			}
+			if !was {
+				s.log.Warn("encrypted DNS isn't working", "kind", p.Kind, "address", p.Address, "port", p.Port, "problem", p.Problem)
+			}
+		}
+	}
+	return h
+}
+
+func (s *Server) encryptedDNSHealth() *encdns.Health {
+	s.encHealth.Lock()
+	defer s.encHealth.Unlock()
+	return s.encHealth.h
+}
+
+// encryptedDNSCheckNow: POST /encrypted-dns/health checks the listeners now.
+func (s *Server) encryptedDNSCheckNow(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	if err := s.encReady(p, false); err != nil {
+		return err
+	}
+	h := s.checkEncryptedDNS(r.Context())
+	if h == nil {
+		return conflict("encrypted DNS isn't set up")
+	}
+	writeJSON(w, http.StatusOK, h)
+	return nil
+}

internal/server/h_exposure.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"jarl/internal/mailcheck"
 	"net/http"
 	"time"
 
@@ -32,6 +33,11 @@ type exposureReport struct {
 	// RateLimiting is what rate limiting limited, or would have, in the
 	// last 24 hours (with query statistics on).
 	RateLimiting *rateLimitActivity `json:"rate_limiting,omitempty"`
+	// RateLimitLog is false when stats.rate_limit_log is off: what rate
+	// limiting does isn't counted then.
+	RateLimitLog bool `json:"rate_limit_log"`
+	// Mail is the last check of the mail addresses' reverse DNS.
+	Mail *mailcheck.Report `json:"mail,omitempty"`
 }
 
 type rateLimitActivity struct {
@@ -52,7 +58,7 @@ func (s *Server) exposure(w http.ResponseWriter, r *http.Request, p *auth.Princi
 		return err
 	}
 	problems := s.eng.Validate(st)
-	out := exposureReport{Scopes: []exposureScope{}, Server: []exposureFinding{}}
+	out := exposureReport{Scopes: []exposureScope{}, Server: []exposureFinding{}, RateLimitLog: s.cfg.RateLimitLog}
 	finding := func(pr validate.Problem, viewID int64) exposureFinding {
 		_, desc := engine.ExposureFix(st, viewID, pr.Code)
 		return exposureFinding{Problem: pr, Fix: desc}
@@ -96,6 +102,7 @@ func (s *Server) exposure(w http.ResponseWriter, r *http.Request, p *auth.Princi
 		a.Names, _ = s.statsQ.Top(ctx, stats.KindRateLimitedName, since, 10)
 		out.RateLimiting = a
 	}
+	out.Mail = s.mailReport()
 	writeJSON(w, http.StatusOK, out)
 	return nil
 }

internal/server/h_mail.go

@@ -0,0 +1,83 @@
+package server
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"jarl/internal/auth"
+	"jarl/internal/mailcheck"
+)
+
+// mailCheckEvery is how often jarld checks the reverse DNS of the
+// addresses that send and receive mail (docs/exposure.md#mail).
+const mailCheckEvery = 6 * time.Hour
+
+// checkMail checks the reverse DNS of the public zones' mail addresses and
+// keeps the report; it logs addresses that became wrong.
+func (s *Server) checkMail(ctx context.Context) *mailcheck.Report {
+	st, err := s.store.LoadState(ctx)
+	if err != nil {
+		s.log.Warn("mail reverse DNS check: loading state", "err", err)
+		return nil
+	}
+	public := map[int64]bool{}
+	for _, x := range s.eng.Exposures(st) {
+		public[x.ViewID] = x.Public
+	}
+	if len(st.Views) == 0 {
+		public[0] = true
+	}
+	ctx, cancel := context.WithTimeout(ctx, 2*time.Minute)
+	defer cancel()
+	rep := mailcheck.Check(ctx, st, func(id int64) bool { return public[id] }, mailcheck.Resolver{Servers: s.cfg.Resolvers})
+	s.mail.Lock()
+	prev := s.mail.r
+	s.mail.r = rep
+	s.mail.Unlock()
+	was := map[string]bool{}
+	if prev != nil {
+		for _, r := range prev.Results {
+			was[r.Zone+"|"+r.Address] = r.OK
+		}
+	}
+	for _, r := range rep.Results {
+		if ok, seen := was[r.Zone+"|"+r.Address]; !r.OK && (ok || !seen) {
+			s.log.Warn("mail reverse DNS", "zone", r.Zone, "address", r.Address, "problem", r.Message)
+		}
+	}
+	return rep
+}
+
+func (s *Server) mailReport() *mailcheck.Report {
+	s.mail.Lock()
+	defer s.mail.Unlock()
+	return s.mail.r
+}
+
+// mailCheckNow: POST /exposure/mail checks now and returns the report.
+func (s *Server) mailCheckNow(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	if err := require(p, auth.Action{Resource: auth.ResOptions}); err != nil {
+		return err
+	}
+	rep := s.checkMail(r.Context())
+	if rep == nil {
+		rep = &mailcheck.Report{Checked: time.Now(), Results: []mailcheck.Result{}}
+	}
+	writeJSON(w, http.StatusOK, rep)
+	return nil
+}
+
+// mailLoop checks a minute after the start, then every mailCheckEvery.
+func (s *Server) mailLoop(ctx context.Context) {
+	wait := time.Minute
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.After(wait):
+			s.checkMail(ctx)
+			wait = mailCheckEvery
+		}
+	}
+}

internal/server/h_stats.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"errors"
 	"net/http"
 	"net/netip"
 	"path/filepath"
@@ -14,14 +15,24 @@ import (
 	"jarl/internal/stats"
 )
 
-// statsQuerier checks permission and that statistics are enabled.
-func (s *Server) statsQuerier(p *auth.Principal) (*stats.Querier, error) {
+// statsQuerier checks permission and that statistics are enabled. With
+// ?views=internal,vps the figures are for those views only.
+func (s *Server) statsQuerier(r *http.Request, p *auth.Principal) (*stats.Querier, error) {
 	if err := require(p, auth.Action{Resource: auth.ResStats}); err != nil {
 		return nil, err
 	}
 	if s.statsQ == nil {
 		return nil, &httpError{http.StatusNotFound, "stats_disabled", "query statistics are disabled; set stats.enabled: true in /etc/jarl/jarl.yaml and restart jarl (see docs/stats.md)"}
 	}
+	var views []string
+	for _, v := range strings.Split(r.URL.Query().Get("views"), ",") {
+		if v = strings.TrimSpace(v); v != "" {
+			views = append(views, v)
+		}
+	}
+	if len(views) > 0 {
+		return s.statsQ.ForViews(views), nil
+	}
 	return s.statsQ, nil
 }
 
@@ -46,7 +57,7 @@ func (s *Server) statsStatus(w http.ResponseWriter, r *http.Request, p *auth.Pri
 }
 
 func (s *Server) statsSummary(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
-	q, err := s.statsQuerier(p)
+	q, err := s.statsQuerier(r, p)
 	if err != nil {
 		return err
 	}
@@ -66,7 +77,7 @@ func (s *Server) statsSummary(w http.ResponseWriter, r *http.Request, p *auth.Pr
 }
 
 func (s *Server) statsTop(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
-	q, err := s.statsQuerier(p)
+	q, err := s.statsQuerier(r, p)
 	if err != nil {
 		return err
 	}
@@ -93,7 +104,7 @@ func (s *Server) statsTop(w http.ResponseWriter, r *http.Request, p *auth.Princi
 }
 
 func (s *Server) statsTimeline(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
-	q, err := s.statsQuerier(p)
+	q, err := s.statsQuerier(r, p)
 	if err != nil {
 		return err
 	}
@@ -124,7 +135,7 @@ func (s *Server) statsTimeline(w http.ResponseWriter, r *http.Request, p *auth.P
 }
 
 func (s *Server) statsHeatmap(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
-	q, err := s.statsQuerier(p)
+	q, err := s.statsQuerier(r, p)
 	if err != nil {
 		return err
 	}
@@ -143,7 +154,7 @@ func (s *Server) statsHeatmap(w http.ResponseWriter, r *http.Request, p *auth.Pr
 }
 
 func (s *Server) statsBreakdown(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
-	q, err := s.statsQuerier(p)
+	q, err := s.statsQuerier(r, p)
 	if err != nil {
 		return err
 	}
@@ -152,6 +163,9 @@ func (s *Server) statsBreakdown(w http.ResponseWriter, r *http.Request, p *auth.
 		return err
 	}
 	es, err := q.Breakdown(r.Context(), r.URL.Query().Get("group"), since)
+	if errors.Is(err, stats.ErrNotPerView) {
+		return &httpError{http.StatusBadRequest, "not_per_view", r.URL.Query().Get("group") + ": " + err.Error()}
+	}
 	if err != nil {
 		return badRequest("%v", err)
 	}
@@ -247,7 +261,7 @@ func clientNames(st *model.State, want map[netip.Addr]bool, readable func(*model
 // limits (rndc status), and the space left on the file systems Jarl and
 // named write to.
 func (s *Server) statsServer(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
-	if _, err := s.statsQuerier(p); err != nil {
+	if _, err := s.statsQuerier(r, p); err != nil {
 		return err
 	}
 	out := map[string]any{"server": s.cfg.Stats.Server()}

internal/server/metrics.go

@@ -289,6 +289,20 @@ func (s *Server) collectState(ctx context.Context, pw *promWriter, now time.Time
 		}
 	}
 
+	if h := s.encryptedDNSHealth(); h != nil {
+		for _, pr := range h.Probes {
+			pw.gauge("jarl_encrypted_dns_up", "1 when the DNS over TLS or HTTPS listener answered with the right, current certificate at the last check (every 10 minutes).", b2f(pr.OK),
+				"kind", pr.Kind, "address", pr.Address, "port", strconv.Itoa(pr.Port))
+		}
+	}
+
+	if m := s.mailReport(); m != nil {
+		for _, r := range m.Results {
+			pw.gauge("jarl_mail_reverse_dns_ok", "1 when an address that sends or receives a public zone's mail has a PTR record that resolves back to it, at the last check (every 6 hours).", b2f(r.OK),
+				"zone", r.Zone, "address", r.Address)
+		}
+	}
+
 	if tokens, err := s.store.ListTokens(ctx, 0); err == nil {
 		for _, t := range tokens {
 			if t.ExpiresAt != nil && t.RevokedAt == nil {

internal/server/present.go

@@ -22,6 +22,13 @@ func (s *Server) presentZone(st *model.State, z *model.Zone, counts map[int64]re
 		out.RName = dnsname.EmailFromMailbox(z.SOA.RName)
 	}
 	out.Registrar = s.registrarFor(z)
+	if z.Type == model.ZonePrimary && z.ViewID != 0 {
+		for _, o := range st.ZonesNamed(z.Name) {
+			if o.ID != z.ID && o.Type == model.ZonePrimary {
+				out.OtherViews = append(out.OtherViews, st.ViewName(o))
+			}
+		}
+	}
 	for _, o := range st.LinkedWith(z) {
 		out.LinkedWith = append(out.LinkedWith, st.ViewName(o))
 		out.Links = append(out.Links, api.ZoneLink{ID: o.ID, View: st.ViewName(o)})
@@ -111,7 +118,7 @@ func presentOption(st *model.State, o *model.Option) api.Option {
 	if c, ok := catalog.Default().Lookup(scope, o.Name); ok {
 		out.Description, out.Status = c.Description, c.Status
 	}
-	if f := namedconf.FormatValue(o.Name, o.Value); f != o.Value {
+	if f := namedconf.FormatValueList(o.Name, o.Value, 3); f != o.Value {
 		out.Formatted = f
 	}
 	return out

internal/server/routes.go

@@ -111,6 +111,7 @@ func (s *Server) routes() {
 	m.HandleFunc("DELETE "+p+"/zones/{zone}/registrar/ds/{keytag}", s.authed(s.registrarRemoveDS))
 	m.HandleFunc("PUT "+p+"/zones/{zone}/registrar/ns", s.authed(s.registrarSetNS))
 	m.HandleFunc("GET "+p+"/zones/{zone}/file", s.authed(s.zoneFile))
+	m.HandleFunc("GET "+p+"/zones/{zone}/compare", s.authed(s.zoneCompare))
 	m.HandleFunc("POST "+p+"/zones/{zone}/link", s.authed(s.zoneLink(true)))
 	m.HandleFunc("POST "+p+"/zones/{zone}/unlink", s.authed(s.zoneLink(false)))
 	m.HandleFunc("POST "+p+"/zones/{zone}/import", s.authed(s.importZoneFile))
@@ -128,6 +129,7 @@ func (s *Server) routes() {
 	m.HandleFunc("POST "+p+"/records/{id}/enable", s.authed(s.setRecordDisabled(false)))
 	// Options and settings
 	m.HandleFunc("GET "+p+"/options", s.authed(s.listOptions))
+	m.HandleFunc("GET "+p+"/options/generated", s.authed(s.generatedOptions))
 	m.HandleFunc("POST "+p+"/options", s.authed(s.createOption))
 	m.HandleFunc("GET "+p+"/options/{id}", s.authed(s.getOption))
 	m.HandleFunc("PATCH "+p+"/options/{id}", s.authed(s.updateOption))
@@ -176,8 +178,10 @@ func (s *Server) routes() {
 	m.HandleFunc("POST "+p+"/encrypted-dns", s.authed(s.encryptedDNSSetup))
 	m.HandleFunc("DELETE "+p+"/encrypted-dns", s.authed(s.encryptedDNSDisable))
 	m.HandleFunc("POST "+p+"/encrypted-dns/check", s.authed(s.encryptedDNSCheck))
+	m.HandleFunc("POST "+p+"/encrypted-dns/health", s.authed(s.encryptedDNSCheckNow))
 	m.HandleFunc("GET "+p+"/exposure", s.authed(s.exposure))
 	m.HandleFunc("POST "+p+"/exposure/fix", s.authed(s.exposureFix))
+	m.HandleFunc("POST "+p+"/exposure/mail", s.authed(s.mailCheckNow))
 	m.HandleFunc("POST "+p+"/exposure/ack", s.authed(s.exposureAck(true)))
 	m.HandleFunc("POST "+p+"/exposure/unack", s.authed(s.exposureAck(false)))
 	m.HandleFunc("GET "+p+"/stats/status", s.authed(s.statsStatus))

internal/server/server.go

@@ -4,6 +4,7 @@ package server
 import (
 	"context"
 	"crypto/tls"
+	"crypto/x509"
 	"errors"
 	"fmt"
 	"io/fs"
@@ -21,7 +22,9 @@ import (
 	"jarl/internal/api"
 	"jarl/internal/auth"
 	"jarl/internal/certs"
+	"jarl/internal/encdns"
 	"jarl/internal/engine"
+	"jarl/internal/mailcheck"
 	"jarl/internal/nscheck"
 	"jarl/internal/porkbun"
 	"jarl/internal/stats"
@@ -61,6 +64,12 @@ type Config struct {
 	TOTPIssuer  string
 	// Metrics configures /metrics (metrics.go).
 	Metrics Metrics
+	// RateLimitLog says rate limiting's log lines reach the statistics
+	// (stats.rate_limit_log), for the Exposure page.
+	RateLimitLog bool
+	// Resolvers are public recursive resolvers (acme.resolvers), to see
+	// the mail addresses' reverse DNS as receivers do.
+	Resolvers []string
 	// Certs manages TLS certificates (nil in tests that don't need it),
 	// including the one jarld serves (h_certs.go, sniff.go).
 	Certs *certs.Manager
@@ -90,6 +99,18 @@ type Server struct {
 	// state part of /metrics.
 	started      time.Time
 	metricsCache metricsCache
+	// encHealth is the last check of encrypted DNS's listeners
+	// (h_encdns.go); encRoots the CAs it trusts (nil: the system's).
+	encHealth struct {
+		sync.Mutex
+		h *encdns.Health
+	}
+	encRoots *x509.CertPool
+	// mail is the last check of the mail addresses' reverse DNS (h_mail.go).
+	mail struct {
+		sync.Mutex
+		r *mailcheck.Report
+	}
 
 	mu   sync.Mutex
 	srvs []*http.Server
@@ -226,6 +247,15 @@ func (s *Server) Serve(ctx context.Context, ready func()) error {
 		ready()
 	}
 	go s.housekeeping(ctx)
+	go s.mailLoop(ctx)
+	go func() {
+		// Once jarld and named have settled after a start.
+		select {
+		case <-ctx.Done():
+		case <-time.After(30 * time.Second):
+			s.checkEncryptedDNS(ctx)
+		}
+	}()
 	select {
 	case <-ctx.Done():
 	case err := <-errc:
@@ -300,6 +330,7 @@ func (s *Server) housekeeping(ctx context.Context) {
 			}
 			s.limiter.cleanup()
 			s.warnExpiringTokens(ctx, time.Now())
+			s.checkEncryptedDNS(ctx)
 			if s.certs != nil {
 				s.certs.reloadIfChanged()
 			}

internal/server/stats_test.go

@@ -35,7 +35,10 @@ func TestStatsAPI(t *testing.T) {
 	minute := now.Unix() - now.Unix()%60 - 120
 	hour := minute - minute%3600
 	b := &stats.Batch{}
-	vals := map[string]int64{"queries": 50, "rcode:NOERROR": 45, "rcode:NXDOMAIN": 5, "qtype:A": 30, "qtype:AAAA": 20, "zone:example.com": 40, "zone:-": 10}
+	vals := map[string]int64{"queries": 50, "rcode:NOERROR": 45, "rcode:NXDOMAIN": 5, "qtype:A": 30, "qtype:AAAA": 20, "zone:example.com": 40, "zone:-": 10,
+		"view:internal": 30, "view:external": 20, stats.ViewKey("internal", "responses"): 30, stats.ViewKey("external", "responses"): 20,
+		stats.ViewKey("internal", "rcode:NOERROR"): 30, stats.ViewKey("external", "rcode:NOERROR"): 15, stats.ViewKey("external", "rcode:NXDOMAIN"): 5,
+		"answer:authoritative": 40}
 	b.AddCounters(stats.ResMinute, minute, vals)
 	b.AddCounters(stats.ResHour, hour, vals)
 	b.SetTops(stats.ResHour, hour, stats.KindName, []stats.Entry{{Key: "www.example.com", Count: 30}, {Key: "mail.example.com", Count: 10}})
@@ -47,6 +50,16 @@ func TestStatsAPI(t *testing.T) {
 	c := stats.NewCollector(ss, opts, nil, slog.New(slog.NewTextHandler(io.Discard, nil)))
 	e := newAPIEnv(t, c)
 
+	// Some views only.
+	if sum := e.do("GET", "/stats/summary?since=1h&views=external", e.token, nil, 200); sum["queries"].(float64) != 20 || len(sum["rcodes"].([]any)) != 2 || sum["filter_views"] == nil {
+		t.Errorf("external summary = %v", sum)
+	}
+	if b := e.list("/stats/breakdown?group=rcode&since=1h&views=internal,external", e.token); len(b) != 2 || b[0]["count"].(float64) != 45 {
+		t.Errorf("rcodes of both views = %v", b)
+	}
+	if out, status := e.req("GET", "/stats/breakdown?group=answer&since=1h&views=internal", e.token, nil); status != 400 || !strings.Contains(string(out), "not_per_view") {
+		t.Errorf("answers per view = %d %s", status, out)
+	}
 	if st := e.do("GET", "/stats/status", e.token, nil, 200); st["enabled"] != true {
 		t.Errorf("status = %v", st)
 	}

internal/stats/collector.go

@@ -33,6 +33,13 @@ const (
 	KindRateLimitedName = "ratelimited_name"
 )
 
+// ViewKey is the key of a counter for one view: per-view copies of the
+// counters that come from named's response log (docs/stats.md).
+func ViewKey(view, key string) string { return "@" + view + "/" + key }
+
+// ViewKind is the kind of a top list for one view.
+func ViewKind(kind, view string) string { return kind + "@" + view }
+
 // Kinds lists the top-list kinds.
 var Kinds = []string{KindName, KindClient, KindNXDomain, KindServFail, KindRefused, KindBlocked, KindBlockedClient, KindRateLimited, KindRateLimitedName}
 
@@ -115,6 +122,9 @@ type Collector struct {
 	// rewritten holds queries named blocked (client#port|name) until their
 	// response line arrives.
 	rewritten map[string]bool
+	// viewsSince is set once per-view counters exist (meta views_since).
+	viewsSince   bool
+	viewsSinceAt int64
 	// proc is the last sample of named's process, server the latest server
 	// statistics (server.go).
 	proc   *namedProc
@@ -212,6 +222,9 @@ func (c *Collector) start(ctx context.Context) {
 			}
 		}
 	}
+	if v, _ := c.store.Meta(ctx, "views_since"); v != "" {
+		c.viewsSince = true
+	}
 	if v, _ := c.store.Meta(ctx, "first_data"); v != "" {
 		if n, err := strconv.ParseInt(v, 10, 64); err == nil {
 			t := time.Unix(n, 0)
@@ -227,7 +240,8 @@ func (c *Collector) start(ctx context.Context) {
 	if last, err := strconv.ParseInt(merged, 10, 64); err == nil {
 		from := max(last+3600, cur-48*3600)
 		for h := from; h < cur; h += 3600 {
-			for _, k := range Kinds {
+			kinds, _ := c.store.KindsAt(ctx, ResHour, h)
+			for _, k := range kinds {
 				if es, err := c.store.TopsAt(ctx, ResHour, h, k); err == nil && len(es) > 0 {
 					b.AddTops(ResDay, c.dayOf(time.Unix(h, 0)), k, es, 3*c.opts.TopN)
 				}
@@ -235,7 +249,8 @@ func (c *Collector) start(ctx context.Context) {
 		}
 	}
 	b.SetMeta("merged_through", strconv.FormatInt(cur-3600, 10))
-	for _, k := range Kinds {
+	curKinds, _ := c.store.KindsAt(ctx, ResHour, cur)
+	for _, k := range curKinds {
 		es, err := c.store.TopsAt(ctx, ResHour, cur, k)
 		if err != nil || len(es) == 0 {
 			continue
@@ -294,7 +309,7 @@ func (c *Collector) count(minute int64, key string, n int64) {
 		c.minutes[minute] = m
 	}
 	m[key] += n
-	if !strings.HasPrefix(key, "g:") && !strings.HasPrefix(key, "gn:") {
+	if !strings.HasPrefix(key, "g:") && !strings.HasPrefix(key, "gn:") && !strings.HasPrefix(key, "@") {
 		c.totals[key] += n
 	}
 }
@@ -365,33 +380,55 @@ func (c *Collector) handleLine(line string) {
 	if view == "" {
 		view = "_default"
 	}
+	zone := c.zoneOf(ev.Name, ev.View)
 	c.count(minute, "responses", 1)
 	c.count(minute, "view:"+view, 1)
-	c.count(minute, "zone:"+c.zoneOf(ev.Name, ev.View), 1)
+	c.count(minute, "zone:"+zone, 1)
+	// The same, per view, for the statistics of chosen views.
+	c.countView(minute, view, "responses", 1)
+	c.countView(minute, view, "zone:"+zone, 1)
+	c.countView(minute, view, "rcode:"+ev.RCode, 1)
+	c.countView(minute, view, "qtype:"+ev.Type, 1)
 	client := clientKey(ev.Client, c.opts.Anonymize)
 	hours := c.hours
 	if hour < c.liveHour {
 		hours = c.late
 	}
 	hours[hour] = c.hourMaps(hours, hour)
-	tops := hours[hour]
-	tops[KindName][ev.Name]++
-	tops[KindClient][client]++
-	switch {
-	case blocked:
-		// Counted by handleRewrite; not a name that doesn't exist.
-	case ev.RCode == "NXDOMAIN":
-		tops[KindNXDomain][ev.Name]++
-	case ev.RCode == "SERVFAIL":
-		tops[KindServFail][ev.Name]++
-	case ev.RCode == "REFUSED":
-		tops[KindRefused][client]++
-	}
-	for _, m := range tops {
+	add := func(kind, key string) {
+		hours[hour][kind][key]++
+		m := c.topsMap(hours, hour, ViewKind(kind, view))
+		m[key]++
 		if len(m) > maxKeys {
 			shrink(m)
 		}
 	}
+	add(KindName, ev.Name)
+	add(KindClient, client)
+	switch {
+	case blocked:
+		// Counted by handleRewrite; not a name that doesn't exist.
+	case ev.RCode == "NXDOMAIN":
+		add(KindNXDomain, ev.Name)
+	case ev.RCode == "SERVFAIL":
+		add(KindServFail, ev.Name)
+	case ev.RCode == "REFUSED":
+		add(KindRefused, client)
+	}
+	for _, k := range Kinds {
+		if m := hours[hour][k]; len(m) > maxKeys {
+			shrink(m)
+		}
+	}
+}
+
+// countView counts a per-view copy of a counter.
+func (c *Collector) countView(minute int64, view, key string, n int64) {
+	if !c.viewsSince {
+		c.viewsSince = true
+		c.viewsSinceAt = minute
+	}
+	c.count(minute, ViewKey(view, key), n)
 }
 
 // handleRewrite counts a query that blocking answered: "blocked", and
@@ -412,15 +449,24 @@ func (c *Collector) handleRewrite(rw Rewrite) {
 	}
 	c.rewritten[rw.Client.String()+"#"+rw.Port+"|"+rw.Name] = true
 	minute, hour := c.minuteOf(rw.Time), c.hourOf(rw.Time)
+	view := rw.View
+	if view == "" {
+		view = "_default"
+	}
 	c.count(minute, "blocked", 1)
 	c.count(minute, "blocklist:"+policySource(rw.Via), 1)
+	c.countView(minute, view, "blocked", 1)
+	c.countView(minute, view, "blocklist:"+policySource(rw.Via), 1)
 	hours := c.hours
 	if hour < c.liveHour {
 		hours = c.late
 	}
 	hours[hour] = c.hourMaps(hours, hour)
+	client := clientKey(rw.Client, c.opts.Anonymize)
 	hours[hour][KindBlocked][rw.Name]++
-	hours[hour][KindBlockedClient][clientKey(rw.Client, c.opts.Anonymize)]++
+	hours[hour][KindBlockedClient][client]++
+	c.topsMap(hours, hour, ViewKind(KindBlocked, view))[rw.Name]++
+	c.topsMap(hours, hour, ViewKind(KindBlockedClient, view))[client]++
 }
 
 // handleRateLimit counts a response rate limiting limited, or would have:
@@ -437,7 +483,12 @@ func (c *Collector) handleRateLimit(rl RateLimit) {
 		key = "rrl:would-" + rl.Action
 	}
 	minute, hour := c.minuteOf(rl.Time), c.hourOf(rl.Time)
+	view := rl.View
+	if view == "" {
+		view = "_default"
+	}
 	c.count(minute, key, 1)
+	c.countView(minute, view, key, 1)
 	hours := c.hours
 	if hour < c.liveHour {
 		hours = c.late
@@ -445,6 +496,8 @@ func (c *Collector) handleRateLimit(rl RateLimit) {
 	hours[hour] = c.hourMaps(hours, hour)
 	hours[hour][KindRateLimited][rl.Prefix]++
 	hours[hour][KindRateLimitedName][rl.Name+" "+rl.Type]++
+	c.topsMap(hours, hour, ViewKind(KindRateLimited, view))[rl.Prefix]++
+	c.topsMap(hours, hour, ViewKind(KindRateLimitedName, view))[rl.Name+" "+rl.Type]++
 }
 
 // policySource names what a rewrite came from: a blocklist's name, "rules"
@@ -547,6 +600,10 @@ func (c *Collector) flush(ctx context.Context, final bool) {
 		b.AddCounters(ResHour, c.hourOf(t), vals)
 		b.AddCounters(ResDay, c.dayOf(t), vals)
 		delete(c.minutes, m)
+		if c.viewsSinceAt != 0 {
+			b.SetMeta("views_since", strconv.FormatInt(c.viewsSinceAt, 10))
+			c.viewsSinceAt = 0
+		}
 		if first && len(vals) > 0 {
 			ft := t
 			c.status.FirstData = &ft

internal/stats/query.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"fmt"
 	"slices"
+	"strconv"
 	"strings"
 	"time"
 )
@@ -14,6 +15,110 @@ type Querier struct {
 	Store *Store
 	Opts  Options
 	Now   func() time.Time
+	// Views limits the figures to these views (none: every view). Only
+	// what named's response log says can be split by view; named's own
+	// counters (cache, transport, round trips, ...) can't.
+	Views []string
+}
+
+// ForViews returns a querier limited to views (all views when empty).
+func (q *Querier) ForViews(views []string) *Querier {
+	c := *q
+	c.Views = views
+	return &c
+}
+
+func (q *Querier) filtered() bool { return len(q.Views) > 0 }
+
+// perView reports whether a counter key exists per view, and its name
+// there ("queries" is counted as responses).
+func perView(key string) (string, bool) {
+	if key == "queries" || key == "responses" {
+		return "responses", true
+	}
+	if key == "blocked" {
+		return key, true
+	}
+	for _, p := range []string{"rcode:", "qtype:", "zone:", "blocklist:", "rrl:"} {
+		if strings.HasPrefix(key, p) || key+":" == p {
+			return key, true
+		}
+	}
+	return key, false
+}
+
+// PerViewGroups are the Breakdown groups that exist per view.
+var PerViewGroups = []string{"qtype", "rcode", "view", "zone", "blocklist", "rrl"}
+
+// ErrNotPerView is returned for figures named only keeps for the whole server.
+var ErrNotPerView = fmt.Errorf("named keeps this for the whole server only, not per view")
+
+// sums is Store.sums, limited to the querier's views.
+func (q *Querier) sums(ctx context.Context, res string, from, to int64, prefix string) (map[string]int64, error) {
+	if !q.filtered() {
+		return q.Store.sums(ctx, res, from, to, prefix)
+	}
+	if prefix == "view:" {
+		all, err := q.Store.sums(ctx, res, from, to, prefix)
+		if err != nil {
+			return nil, err
+		}
+		out := map[string]int64{}
+		for _, v := range q.Views {
+			if n := all["view:"+v]; n != 0 {
+				out["view:"+v] = n
+			}
+		}
+		return out, nil
+	}
+	if _, ok := perView(prefix); !ok {
+		// Not kept per view (named's own counters): the whole server's.
+		return q.Store.sums(ctx, res, from, to, prefix)
+	}
+	out := map[string]int64{}
+	for _, v := range q.Views {
+		m, err := q.Store.sums(ctx, res, from, to, ViewKey(v, prefix))
+		if err != nil {
+			return nil, err
+		}
+		for k, n := range m {
+			out[strings.TrimPrefix(k, ViewKey(v, ""))] += n
+		}
+	}
+	return out, nil
+}
+
+// series is Store.series, limited to the querier's views.
+func (q *Querier) series(ctx context.Context, res string, from, to int64, key string) (map[int64]int64, error) {
+	pv, ok := perView(key)
+	if !q.filtered() || !ok {
+		return q.Store.series(ctx, res, from, to, key)
+	}
+	out := map[int64]int64{}
+	for _, v := range q.Views {
+		m, err := q.Store.series(ctx, res, from, to, ViewKey(v, pv))
+		if err != nil {
+			return nil, err
+		}
+		for ts, n := range m {
+			out[ts] += n
+		}
+	}
+	return out, nil
+}
+
+// ViewsSince is when per-view figures start (nil before any).
+func (q *Querier) ViewsSince(ctx context.Context) *time.Time {
+	v, err := q.Store.Meta(ctx, "views_since")
+	if err != nil || v == "" {
+		return nil
+	}
+	n, err := strconv.ParseInt(v, 10, 64)
+	if err != nil {
+		return nil
+	}
+	t := time.Unix(n, 0)
+	return &t
 }
 
 // NewQuerier returns a querier for a collector's data.
@@ -105,10 +210,15 @@ func (s *Store) series(ctx context.Context, res string, from, to int64, key stri
 	return out, rows.Err()
 }
 
-// tops sums top lists in [from, to).
-func (s *Store) tops(ctx context.Context, res, kind string, from, to int64, limit int) ([]Entry, error) {
-	rows, err := s.db.QueryContext(ctx, `SELECT key, SUM(count) AS n FROM tops WHERE res = ? AND kind = ? AND ts >= ? AND ts < ?
-		GROUP BY key ORDER BY n DESC, key LIMIT ?`, res, kind, from, to, limit)
+// tops sums top lists (of one or more kinds) in [from, to).
+func (s *Store) tops(ctx context.Context, res string, kinds []string, from, to int64, limit int) ([]Entry, error) {
+	args := []any{res}
+	for _, k := range kinds {
+		args = append(args, k)
+	}
+	args = append(args, from, to, limit)
+	rows, err := s.db.QueryContext(ctx, `SELECT key, SUM(count) AS n FROM tops WHERE res = ? AND kind IN (`+strings.TrimSuffix(strings.Repeat("?,", len(kinds)), ",")+`) AND ts >= ? AND ts < ?
+		GROUP BY key ORDER BY n DESC, key LIMIT ?`, args...)
 	if err != nil {
 		return nil, err
 	}
@@ -167,6 +277,11 @@ type Summary struct {
 	BlockedRatio  *float64           `json:"blocked_ratio,omitempty"`
 	Blocklists    []Entry            `json:"blocklists,omitempty"`
 	Tops          map[string][]Entry `json:"tops,omitempty"`
+	// Views and ViewsSince are set when the figures are for some views
+	// only: queries then counts responses, and named's own counters
+	// (answers, transport, cache) are left out.
+	FilterViews []string   `json:"filter_views,omitempty"`
+	ViewsSince  *time.Time `json:"views_since,omitempty"`
 }
 
 // Summary summarizes the last since.
@@ -179,9 +294,32 @@ func (q *Querier) Summary(ctx context.Context, since time.Duration, topLimit int
 	if err != nil {
 		return nil, err
 	}
+	if q.filtered() {
+		// The chosen views' counters, under their usual names.
+		views := map[string]int64{}
+		for _, v := range q.Views {
+			views["view:"+v] = all["view:"+v]
+		}
+		picked := map[string]int64{}
+		for k, n := range all {
+			for _, v := range q.Views {
+				if rest, ok := strings.CutPrefix(k, ViewKey(v, "")); ok {
+					picked[rest] += n
+				}
+			}
+		}
+		for k, n := range views {
+			picked[k] = n
+		}
+		picked["queries"] = picked["responses"]
+		all = picked
+	}
 	s := &Summary{From: time.Unix(from, 0), To: now, Resolution: res, Queries: all["queries"],
 		RCodes: sorted(all, "rcode:"), QTypes: sorted(all, "qtype:"), Views: sorted(all, "view:"), Zones: sorted(all, "zone:"),
 		Answers: sorted(all, "answer:"), Transport: sorted(all, "transport:")}
+	if q.filtered() {
+		s.FilterViews, s.ViewsSince = q.Views, q.ViewsSince(ctx)
+	}
 	if h, m := all["cache:hits"], all["cache:misses"]; h+m > 0 {
 		r := float64(h) / float64(h+m)
 		s.CacheHitRatio = &r
@@ -195,7 +333,7 @@ func (q *Querier) Summary(ctx context.Context, since time.Duration, topLimit int
 			s.BlockedRatio = &b
 		}
 	}
-	per, err := q.Store.series(ctx, res, from, to, "queries")
+	per, err := q.series(ctx, res, from, to, "queries")
 	if err != nil {
 		return nil, err
 	}
@@ -237,7 +375,14 @@ func (q *Querier) Top(ctx context.Context, kind string, since time.Duration, lim
 	}
 	now := q.Now()
 	res := q.topsResolution(since)
-	return q.Store.tops(ctx, res, kind, q.bucketStart(res, now.Add(-since)), now.Unix()+1, limit)
+	kinds := []string{kind}
+	if q.filtered() {
+		kinds = nil
+		for _, v := range q.Views {
+			kinds = append(kinds, ViewKind(kind, v))
+		}
+	}
+	return q.Store.tops(ctx, res, kinds, q.bucketStart(res, now.Add(-since)), now.Unix()+1, limit)
 }
 
 // Breakdown returns the totals of a counter group (qtype, rcode, view,
@@ -246,9 +391,12 @@ func (q *Querier) Breakdown(ctx context.Context, group string, since time.Durati
 	if !slices.Contains(Groups, group) {
 		return nil, fmt.Errorf("unknown group %q (use %s)", group, strings.Join(Groups, ", "))
 	}
+	if q.filtered() && !slices.Contains(PerViewGroups, group) {
+		return nil, ErrNotPerView
+	}
 	now := q.Now()
 	res := q.Resolution(since)
-	m, err := q.Store.sums(ctx, res, q.bucketStart(res, now.Add(-since)), now.Unix()+1, group+":")
+	m, err := q.sums(ctx, res, q.bucketStart(res, now.Add(-since)), now.Unix()+1, group+":")
 	if err != nil {
 		return nil, err
 	}
@@ -329,7 +477,7 @@ func (q *Querier) Timeline(ctx context.Context, since time.Duration, step string
 	var expanded []string
 	for _, k := range keys {
 		if g, ok := strings.CutSuffix(k, ":*"); ok {
-			m, err := q.Store.sums(ctx, st.res, from, to, g+":")
+			m, err := q.sums(ctx, st.res, from, to, g+":")
 			if err != nil {
 				return nil, err
 			}
@@ -342,7 +490,7 @@ func (q *Querier) Timeline(ctx context.Context, since time.Duration, step string
 	}
 	tl := &Timeline{Step: st.name, Times: starts, Series: []*Series{}}
 	bucketed := func(key string) ([]int64, error) {
-		raw, err := q.Store.series(ctx, st.res, from, to, key)
+		raw, err := q.series(ctx, st.res, from, to, key)
 		if err != nil {
 			return nil, err
 		}
@@ -404,7 +552,7 @@ func (q *Querier) Heatmap(ctx context.Context, key string, since time.Duration)
 	since = min(since, q.Opts.RetainHour)
 	now := q.Now()
 	from := q.bucketStart(ResHour, now.Add(-since))
-	raw, err := q.Store.series(ctx, ResHour, from, now.Unix()+1, key)
+	raw, err := q.series(ctx, ResHour, from, now.Unix()+1, key)
 	if err != nil {
 		return nil, err
 	}

internal/stats/store.go

@@ -264,3 +264,22 @@ func (s *Store) TopsAt(ctx context.Context, res string, ts int64, kind string) (
 	}
 	return out, rows.Err()
 }
+
+// KindsAt returns the top-list kinds stored for one bucket (per-view
+// kinds included).
+func (s *Store) KindsAt(ctx context.Context, res string, ts int64) ([]string, error) {
+	rows, err := s.db.QueryContext(ctx, `SELECT DISTINCT kind FROM tops WHERE res = ? AND ts = ?`, res, ts)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []string
+	for rows.Next() {
+		var k string
+		if err := rows.Scan(&k); err != nil {
+			return nil, err
+		}
+		out = append(out, k)
+	}
+	return out, rows.Err()
+}

internal/stats/views_test.go

@@ -0,0 +1,103 @@
+package stats
+
+import (
+	"context"
+	"errors"
+	"io"
+	"log/slog"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+// Figures for chosen views: from the response log, per view, and added
+// up for several.
+func TestViewFilter(t *testing.T) {
+	ctx := context.Background()
+	loc := time.FixedZone("test", 0)
+	dir := t.TempDir()
+	logFile := filepath.Join(dir, "responses.log")
+	store, err := OpenStore(filepath.Join(dir, "stats.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer store.Close()
+	named := newFakeNamed(t)
+	clk := &clock{time.Date(2026, 10, 5, 10, 0, 30, 0, loc)}
+	opts := Options{QueryLog: true, LogFile: logFile, StatisticsChannel: "unused", TopN: 10,
+		RetainMinute: 7 * 24 * time.Hour, RetainHour: 90 * 24 * time.Hour, RetainDay: 730 * 24 * time.Hour, Location: loc}
+	zones := func() map[string][]string {
+		return map[string][]string{"internal": {"adbraun.lol"}, "external": {"adbraun.lol"}}
+	}
+	c := NewCollector(store, opts, zones, slog.New(slog.NewTextHandler(io.Discard, nil)))
+	c.poller.URL = named.srv.URL
+	c.now = clk.now
+	c.start(ctx)
+	at := time.Date(2026, 10, 5, 10, 0, 40, 0, loc)
+	lines := []string{
+		logLine(at, "10.10.0.37", "internal", "nas.adbraun.lol", "A", "NOERROR"),
+		logLine(at, "10.10.0.37", "internal", "nas.adbraun.lol", "AAAA", "NOERROR"),
+		logLine(at, "10.10.0.42", "internal", "nope.adbraun.lol", "A", "NXDOMAIN"),
+		logLine(at, "203.0.113.9", "external", "www.adbraun.lol", "A", "NOERROR"),
+		logLine(at, "203.0.113.9", "external", "x.example", "A", "REFUSED"),
+		logLine(at, "192.0.2.5", "vps", "debian.org", "AAAA", "NOERROR"),
+	}
+	f, _ := os.Create(logFile)
+	for _, l := range lines {
+		f.WriteString(l)
+	}
+	f.Close()
+	c.readLog()
+	named.add(6, 1)
+	clk.t = time.Date(2026, 10, 5, 10, 1, 2, 0, loc)
+	c.flush(ctx, false)
+	clk.t = time.Date(2026, 10, 5, 11, 0, 2, 0, loc)
+	c.flush(ctx, false)
+
+	all := &Querier{Store: store, Opts: opts, Now: clk.now}
+	s, err := all.Summary(ctx, 24*time.Hour, 5)
+	if err != nil || s.Queries != 6 || s.FilterViews != nil {
+		t.Fatalf("all views: %+v %v", s, err)
+	}
+	in := all.ForViews([]string{"internal"})
+	s, err = in.Summary(ctx, 24*time.Hour, 5)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s.Queries != 3 || len(s.Views) != 1 || s.Views[0].Key != "internal" || s.ViewsSince == nil {
+		t.Errorf("internal: queries %d views %v since %v", s.Queries, s.Views, s.ViewsSince)
+	}
+	if len(s.RCodes) != 2 || s.RCodes[0] != (Entry{Key: "NOERROR", Count: 2}) || len(s.QTypes) != 2 {
+		t.Errorf("internal rcodes %v qtypes %v", s.RCodes, s.QTypes)
+	}
+	if s.Tops[KindName][0] != (Entry{Key: "nas.adbraun.lol", Count: 2}) || len(s.Tops[KindNXDomain]) != 1 || len(s.Answers) != 0 {
+		t.Errorf("internal tops %v answers %v", s.Tops, s.Answers)
+	}
+	// Linked views, say: two together.
+	two := all.ForViews([]string{"internal", "external"})
+	s, _ = two.Summary(ctx, 24*time.Hour, 5)
+	if s.Queries != 5 || len(s.Views) != 2 {
+		t.Errorf("internal+external: %d %v", s.Queries, s.Views)
+	}
+	if es, _ := two.Top(ctx, KindClient, 24*time.Hour, 5); len(es) != 3 || es[2].Key != "10.10.0.42" {
+		t.Errorf("clients of two views: %v", es)
+	}
+	if es, _ := two.Breakdown(ctx, "rcode", 24*time.Hour); len(es) != 3 {
+		t.Errorf("rcodes of two views: %v", es)
+	}
+	if _, err := two.Breakdown(ctx, "answer", 24*time.Hour); !errors.Is(err, ErrNotPerView) {
+		t.Errorf("answers per view: %v", err)
+	}
+	tl, err := all.ForViews([]string{"vps"}).Timeline(ctx, 2*time.Hour, "1m", []string{"queries", "rcode:*"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	var total int64
+	for _, v := range tl.Series[0].Values {
+		total += v
+	}
+	if total != 1 || len(tl.Series) != 2 || tl.Series[1].Key != "rcode:NOERROR" {
+		t.Errorf("vps timeline: %d %+v", total, tl.Series)
+	}
+}

internal/web/static/assets/app.js

@@ -45,21 +45,25 @@ const routes = [
   { pattern: /^encrypted-dns$/, page: encdns, nav: "encdns" },
 ];
 
+// The top bar: the pages used most, then a menu for the server's
+// configuration and security. ["key", "#/href", "Label", "admin"?]
 const navItems = [
   ["dashboard", "#/", "Dashboard"],
   ["stats", "#/stats", "Statistics"],
   ["zones", "#/zones", "Zones"],
-  ["blocking", "#/blocking", "Blocking"],
   ["views", "#/views", "Views"],
-  ["exposure", "#/exposure", "Exposure"],
-  ["certificates", "#/certificates", "Certificates", "admin"],
-  ["encdns", "#/encrypted-dns", "Encrypted DNS", "admin"],
-  ["acls", "#/acls", "ACLs"],
-  ["keys", "#/keys", "TSIG keys"],
-  ["options", "#/options", "Server options"],
+  ["blocking", "#/blocking", "Blocking"],
   ["changes", "#/changes", "Changes"],
   ["history", "#/history", "History"],
-  ["audit", "#/audit", "Audit log"],
+  { menu: "Server", items: [
+    ["options", "#/options", "Server options"],
+    ["acls", "#/acls", "ACLs"],
+    ["keys", "#/keys", "TSIG keys"],
+    ["exposure", "#/exposure", "Exposure"],
+    ["certificates", "#/certificates", "Certificates", "admin"],
+    ["encdns", "#/encrypted-dns", "Encrypted DNS", "admin"],
+    ["audit", "#/audit", "Audit log"],
+  ] },
 ];
 
 const app = document.getElementById("app");
@@ -168,12 +172,16 @@ function layout() {
       logo(30),
       wordmark({ rule: false, height: 19, cls: "brand-name" })),
     navEl,
-    h("div", { class: "spacer" }),
-    modeEl = h("span"),
-    h("form", { class: "search", onsubmit: (e) => { e.preventDefault(); if (q.value.trim()) location.hash = "#/search?q=" + encodeURIComponent(q.value.trim()); } }, q),
-    h("a", { href: "#/account", class: "user", title: (me.permissions || []).join("\n") }, me.user.username),
-    me.admin ? h("a", { href: "#/users" }, "Users") : null,
-    h("button", { class: "small", onclick: logout }, "Log out"));
+    // The right-hand group stays together, on the right, also when it
+    // has to wrap below the navigation.
+    h("div", { class: "header-right" },
+      modeEl = h("span"),
+      h("form", { class: "search", onsubmit: (e) => { e.preventDefault(); if (q.value.trim()) location.hash = "#/search?q=" + encodeURIComponent(q.value.trim()); } }, q),
+      menu(h("span", { class: "user", title: (me.permissions || []).join("\n") }, me.user.username), [
+        h("a", { href: "#/account" }, "Account"),
+        me.admin ? h("a", { href: "#/users" }, "Users") : null,
+        h("button", { type: "button", class: "menu-item", onclick: logout }, "Log out"),
+      ], { right: true, active: ["account", "users"].includes(current.nav), label: "Account menu" })));
   mount(app, h("div", { class: "shell" }, header, barEl, mainEl, footer(me.build)));
   modeHolder = modeEl;
   renderNav();
@@ -196,9 +204,33 @@ function footer(b) {
 }
 
 function renderNav() {
-  mount(navEl, navItems.filter((n) => n[3] !== "admin" || state.me.admin).map(([key, href, label]) => h("a", { href, class: current.nav === key ? "active" : "" }, label)));
+  const allowed = (n) => n[3] !== "admin" || state.me.admin;
+  const link = ([key, href, label]) => h("a", { href, class: current.nav === key ? "active" : "" }, label);
+  mount(navEl, navItems.map((n) => {
+    if (!n.menu) return allowed(n) ? link(n) : null;
+    const items = n.items.filter(allowed);
+    return menu(n.menu, items.map(link), { active: items.some((i) => i[0] === current.nav), label: n.menu + " menu" });
+  }));
 }
 
+// menu is a drop-down: a button and its links. It closes when one is
+// picked, on a click elsewhere and on Escape.
+function menu(label, items, opts = {}) {
+  const d = h("details", { class: "menu" + (opts.right ? " right" : "") },
+    h("summary", { class: opts.active ? "active" : "", "aria-label": opts.label || null }, label, h("span", { class: "caret", "aria-hidden": "true" }, "▾")),
+    h("div", { class: "menu-list", role: "menu" }, items.filter(Boolean)));
+  d.addEventListener("click", (e) => { if (e.target.closest(".menu-list a, .menu-list button")) d.open = false; });
+  return d;
+}
+
+document.addEventListener("click", (e) => {
+  for (const d of document.querySelectorAll("details.menu[open]")) if (!d.contains(e.target)) d.open = false;
+});
+document.addEventListener("keydown", (e) => {
+  if (e.key !== "Escape") return;
+  for (const d of document.querySelectorAll("details.menu[open]")) { d.open = false; d.querySelector("summary").focus(); }
+});
+
 // renderBar shows the pending-changes bar (only while there are pending
 // changes) and the small review/live switch in the header.
 function renderBar() {

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

@@ -18,6 +18,9 @@ export async function render(el) {
     st.backup ? backupCard(st.backup) : null,
     exposure ? exposureCard(exposure) : null,
     st.certificates ? certCard(st.certificates) : null,
+    st.encrypted_dns ? h("a", { class: "card link", href: "#/encrypted-dns" }, h("div", { class: "label" }, "Encrypted DNS"),
+      h("div", { class: "value" }, st.encrypted_dns.ok ? badge("working", "ok") : badge("not working", "err")),
+      h("div", { class: "sub" }, "checked ", time(st.encrypted_dns.checked))) : null,
   );
   const last = s.last_applied;
   const parts = [h("div", { class: "page-head" },
@@ -43,6 +46,9 @@ export async function render(el) {
       h("strong", null, "The last backup failed "), time(b.last_error_at), ": " + b.last_error,
       h("div", { class: "small" }, "See 'journalctl -u jarl-backup' on the server.")));
   }
+  for (const p of (st.encrypted_dns || {}).problems || []) {
+    parts.push(h("div", { class: "msg err" }, h("strong", null, "Encrypted DNS: "), p, " ", h("a", { href: "#/encrypted-dns" }, "Encrypted DNS")));
+  }
   for (const c of (st.certificates || {}).problems || []) {
     parts.push(h("div", { class: "msg " + (c.state === "expiring" ? "warn" : "err") },
       h("strong", null, "Certificate " + c.name + " " + (c.state === "expired" ? "has expired" : c.state === "expiring" ? "expires soon" : "can't be renewed") + ": "), c.message, " ",

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

@@ -2,7 +2,7 @@
 // set up and what to give clients, and a setup that obtains the
 // certificate if needed, checks the ports and stages named's
 // configuration like any change.
-import { h, mount, field, input, badge, toast, errorBox, confirmDialog, copyBox, checkbox } from "../ui.js";
+import { h, mount, field, input, badge, toast, errorBox, confirmDialog, copyBox, checkbox, fmtTime, relTime } from "../ui.js";
 import { api, get, change, describeResult, state } from "../api.js";
 import { rerender } from "../app.js";
 
@@ -50,6 +50,7 @@ function statusPanel(s) {
   }
   return [
     h("div", { class: "panel" }, h("h2", null, "Set up ", badge("on", "ok")), h("dl", { class: "kv" }, rows)),
+    healthPanel(s.health),
     h("div", { class: "panel" }, h("h2", null, "For your clients"),
       h("p", { class: "muted small" }, "Clients check the certificate against the host name, so it must resolve to this server for them (Jarl added it to the private views you chose). Open the ports in the server's firewall for your networks only."),
       clients),
@@ -223,3 +224,28 @@ async function disable() {
     rerender();
   } catch (e) { toast(e.message, "err", 8000); }
 }
+
+// healthPanel shows the last check of the listeners: Jarl connects to each
+// as a client would, checks the certificate and asks a question.
+function healthPanel(hl) {
+  const kind = { dot: "DNS over TLS", doh: "DNS over HTTPS" };
+  const out = h("div");
+  const draw = (x) => {
+    if (!x) return mount(out, h("div", { class: "muted" }, "Not checked yet: Jarl checks a minute after it starts, then every 10 minutes."));
+    mount(out, h("ul", { class: "probes" }, x.probes.map((p) => h("li", null,
+      badge(p.ok ? "working" : "not working", p.ok ? "ok" : "err"), " ",
+      h("strong", null, kind[p.kind]), " ", h("span", { class: "mono" }, p.address + " port " + p.port),
+      p.ok ? h("span", { class: "muted small" }, "  answered " + p.rcode + " in " + p.ms + " ms" + (p.cert_not_after ? " · certificate until " + fmtTime(p.cert_not_after) : "")) : null,
+      p.problem ? h("div", { class: "msg err small" }, p.problem) : null,
+      p.warning ? h("div", { class: "msg warn small" }, p.warning) : null))),
+      h("div", { class: "muted small" }, "Checked ", relTime(x.checked), "."));
+  };
+  draw(hl);
+  const btn = h("button", { class: "small", onclick: async () => {
+    btn.disabled = true;
+    try { draw(await api("POST", "/encrypted-dns/health", { body: {} })); } catch (e) { toast(e.message, "err", 8000); } finally { btn.disabled = false; }
+  } }, "Check now");
+  return h("div", { class: "panel" }, h("div", { class: "page-head" }, h("h2", { class: "grow" }, "Health"), h("div", { class: "actions" }, btn)),
+    h("p", { class: "muted small" }, "Jarl connects to each listener as a client would: the certificate must be for the host name, current, and the one Jarl last wrote; then it asks for the host name."),
+    out);
+}

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

@@ -1,8 +1,8 @@
 // Internet exposure (docs/exposure.md): which views are reachable from
 // the internet, why, and what to harden, with fixes staged like any edit
 // and findings that can be accepted on purpose.
-import { h, mount, table, toast, badge, modal, input, field, errorBox, select, plural } from "../ui.js";
-import { get, change, describeResult, can } from "../api.js";
+import { h, mount, table, toast, badge, modal, input, field, errorBox, select, plural, relTime } from "../ui.js";
+import { api, get, change, describeResult, can } from "../api.js";
 import { rerender } from "../app.js";
 
 const sevKind = { warning: "warn", error: "err", info: "" };
@@ -28,7 +28,11 @@ export async function render(el) {
   parts.push(h("div", { class: "panel" }, h("h2", null, "Findings ", badge(plural(all.filter((f) => f.severity === "warning").length, "warning"), all.some((f) => f.severity === "warning") ? "warn" : "ok")),
     all.length ? h("div", { class: "findings" }, all.map((f) => findingRow(f, writable))) : h("div", { class: "empty" }, r.scopes.some((s) => s.public) ? "Nothing to harden." : "No view is reachable from the internet, so there is nothing to check.")));
 
-  if (r.rate_limiting) parts.push(activity(r.rate_limiting, r.scopes));
+  if (r.rate_limiting && r.rate_limit_log) parts.push(activity(r.rate_limiting, r.scopes));
+  else if (r.rate_limiting && r.scopes.some((s) => s.public && s.rate_limit !== "off")) {
+    parts.push(h("div", { class: "msg info" }, "What rate limiting limits isn't counted: stats.rate_limit_log is off in /etc/jarl/jarl.yaml, so its log lines stay in named's syslog only."));
+  }
+  if (r.scopes.some((s) => s.public)) parts.push(mailPanel(r.mail));
   mount(el, parts);
 }
 
@@ -118,3 +122,31 @@ function activity(a, scopes) {
         table([{ label: "Client network (limited or would be)", render: (e) => h("span", { class: "mono" }, e.key) }, { label: "Responses", render: (e) => String(e.count) }], a.networks || []),
         table([{ label: "Name and type", render: (e) => h("span", { class: "mono" }, e.key) }, { label: "Responses", render: (e) => String(e.count) }], a.names || []))]);
 }
+
+// mailPanel: the reverse DNS of the addresses that send and receive the
+// public zones' mail, as receivers check it (docs/exposure.md#mail).
+function mailPanel(m) {
+  const out = h("div");
+  const lv = { ok: "ok", info: "", warning: "warn" };
+  const draw = (x) => {
+    if (!x) return mount(out, h("div", { class: "muted" }, "Not checked yet: Jarl checks a minute after it starts, then every 6 hours."));
+    const rows = x.results.length ? table([
+      { label: "Address", render: (r) => [h("span", { class: "mono" }, r.address), h("div", { class: "muted small" }, r.zone + ": " + r.roles.join(", "))] },
+      { label: "PTR", render: (r) => r.ptr.length ? h("span", { class: "mono" }, r.ptr.join(", ")) : h("span", { class: "muted" }, "none") },
+      { label: "Reverse zone run by", render: (r) => h("span", { class: "small" }, r.managed_by || "–") },
+      { label: "", render: (r) => [badge(r.ok ? (r.level === "info" ? "works, note" : "works") : "problem", lv[r.level]),
+        r.level !== "ok" ? h("div", { class: "small" }, r.message) : null,
+        r.local_zone ? h("div", { class: "muted small" }, "Jarl's reverse zone " + r.local_zone + " only answers your own clients: receivers ask " + (r.managed_by || "the address's owner") + ".") : null] },
+    ], x.results) : h("div", { class: "empty" }, "No public zone has an MX record or SPF addresses.");
+    mount(out, rows, (x.errors || []).map((e) => h("div", { class: "msg err small" }, e)),
+      h("div", { class: "muted small" }, "Checked ", relTime(x.checked), "."));
+  };
+  draw(m);
+  const btn = h("button", { class: "small", onclick: async () => {
+    btn.disabled = true;
+    try { draw(await api("POST", "/exposure/mail", { body: {} })); } catch (e) { toast(e.message, "err", 8000); } finally { btn.disabled = false; }
+  } }, "Check now");
+  return h("div", { class: "panel" }, h("div", { class: "page-head" }, h("h2", { class: "grow" }, "Mail reverse DNS"), h("div", { class: "actions" }, btn)),
+    h("p", { class: "muted small" }, "Receivers such as Gmail and Outlook reject or mark mail from an address without a PTR record whose name resolves back to it. These records belong to whoever owns the address (your hosting provider or ISP), so Jarl looks them up as the internet sees them: the addresses of your public zones' MX hosts and SPF records."),
+    out);
+}

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

@@ -159,14 +159,32 @@ export async function render(el) {
   const settingsEl = h("div");
   const serverEl = h("div");
   const topEl = h("div");
+  const genEl = h("div");
   mount(el,
     h("div", { class: "page-head" }, h("div", { class: "grow" }, h("h1", null, "Server options"),
       h("div", { class: "muted" }, "Global named options, top-level statements such as logging and controls, and Jarl's defaults for new zones."))),
-    settingsEl, serverEl, topEl);
+    settingsEl, serverEl, topEl, genEl);
   settingsForm(settingsEl, settings);
   await optionsEditor(serverEl, { scope: "options", catalogScope: "options", title: "options { }", intro: "These apply to the whole server; views and zones can override many of them." });
   await optionsEditor(topEl, { scope: "toplevel", catalogScope: "toplevel", title: "Top-level statements",
     intro: "Statements outside options { }, such as logging, controls, statistics-channels, server, remote-servers, tls or include. Values are named.conf syntax, e.g. { channel ... ; category ... ; } for logging." });
+  generatedPanel(genEl, await get("/options/generated").catch(() => []));
+}
+
+// generatedPanel lists what Jarl adds to named.conf by itself: read-only,
+// with why and what turns it on or off.
+function generatedPanel(el, list) {
+  if (!list.length) return;
+  mount(el, h("div", { class: "panel" },
+    h("h2", null, "Added by Jarl"),
+    h("p", { class: "muted" }, "Jarl writes these into named.conf itself, for its own features. They aren't options you can edit here: each is controlled by the setting shown."),
+    h("div", { class: "table-wrap" }, h("table", null,
+      h("thead", null, h("tr", null, h("th", null, "Where"), h("th", null, "Statement"), h("th", null, "Why"), h("th", null, "Controlled by"))),
+      h("tbody", null, list.map((g) => h("tr", null,
+        h("td", { class: "small" }, g.where),
+        h("td", null, h("pre", { class: "code optval", style: "white-space: pre-wrap; word-break: break-all" }, g.text)),
+        h("td", { class: "small" }, g.why),
+        h("td", { class: "small mono" }, g.setting))))))));
 }
 
 function settingsForm(el, s) {

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

@@ -1,5 +1,6 @@
 import { h, mount, fmtTime, relTime, errorBox } from "../ui.js";
 import { get } from "../api.js";
+import { rerender } from "../app.js";
 import { lineChart, chartCard, legend, timeTable, heatmap, heatmapTable, barList, compact, stepSeconds, endLabelWidth } from "../charts.js";
 
 const ranges = [["1h", "1 hour"], ["6h", "6 hours"], ["24h", "24 hours"], ["7d", "7 days"], ["30d", "30 days"], ["90d", "90 days"]];
@@ -17,6 +18,20 @@ const rttOrder = ["<10ms", "10-100ms", "100-500ms", "500-800ms", "800-1600ms", "
 
 let generation = 0;
 
+// The views shown are remembered per browser: the ones switched off, so a
+// new view shows up switched on.
+const offKey = "jarl.stats.views.off";
+function viewsOff() {
+  try { return new Set(JSON.parse(localStorage.getItem(offKey) || "[]")); } catch { return new Set(); }
+}
+function saveViewsOff(set) {
+  try { localStorage.setItem(offKey, JSON.stringify([...set])); } catch { /* private window: not remembered */ }
+}
+
+// Breakdowns that exist per view; the others are named's own counters,
+// for the whole server.
+const perViewGroups = ["qtype", "rcode", "view", "zone", "blocklist"];
+
 export async function render(el, params, query) {
   const gen = ++generation;
   const want = query && query.get ? query.get("since") : null;
@@ -33,11 +48,21 @@ export async function render(el, params, query) {
     return;
   }
   const heatSince = rangeSecs[since] < 7 * 86400 ? "7d" : since;
+  // Which views: all of them unless some are switched off.
+  const allViews = status.query_log ? (await get("/views").catch(() => [])).map((v) => v.name) : [];
+  const off = viewsOff();
+  const shown = allViews.filter((v) => !off.has(v));
+  const filtered = allViews.length > 0 && shown.length < allViews.length;
+  const vf = filtered ? { views: shown.join(",") } : {};
+  if (filtered && !shown.length) {
+    mount(el, head, filterRow(since, allViews, off), h("div", { class: "empty" }, "No views chosen: switch one on above."));
+    return;
+  }
   let data;
   try {
-    data = await loadAll(since, heatSince, status.query_log);
+    data = await loadAll(since, heatSince, status.query_log, vf, filtered);
   } catch (e) {
-    mount(el, head, errorBox(e));
+    mount(el, head, filterRow(since, allViews, off), errorBox(e));
     return;
   }
   if (gen !== generation) return; // the user moved on
@@ -46,13 +71,17 @@ export async function render(el, params, query) {
   // sudden drop in traffic.
   const timeline = complete(data.timeline), errors = complete(data.errors);
   const step = stepSeconds[timeline.step];
-  const parts = [head, filterRow(since)];
+  const parts = [head, filterRow(since, allViews, off)];
   for (const w of status.warnings || []) parts.push(h("div", { class: "msg warn" }, w));
+  if (filtered) {
+    parts.push(h("div", { class: "msg info small" }, "Showing view" + (shown.length > 1 ? "s " : " ") + shown.join(", ") + ": answers from named's response log" +
+      (s.views_since ? ", per view since " + fmtTime(s.views_since) : "") + ". named's own figures (answer sources, upstream times, cache, the server) are for the whole server."));
+  }
 
   // Headline numbers.
   const rangeLabel = "in the last " + ranges.find((r) => r[0] === since)[1];
   parts.push(h("div", { class: "cards" },
-    tile("Queries", compact(s.queries), rangeLabel),
+    tile(filtered ? "Answers" : "Queries", compact(s.queries), rangeLabel),
     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,
@@ -62,7 +91,7 @@ export async function render(el, params, query) {
   // Volume over time: one series, so no legend box; the title names it.
   // With blocking, a second line shows how many of them were blocked.
   const q = timeline.series.find((x) => x.key === "queries") || { values: timeline.times.map(() => 0) };
-  const qSeries = [{ label: "Queries", values: q.values, slot: 1 }];
+  const qSeries = [{ label: filtered ? "Answers" : "Queries", values: q.values, slot: 1 }];
   const bl = timeline.series.find((x) => x.key === "blocked");
   if (bl && bl.values.some((v) => v > 0)) qSeries.push({ label: "Blocked", values: bl.values, slot: 2 });
   // Failed answers: three fixed series, legend plus end labels.
@@ -71,7 +100,8 @@ export async function render(el, params, query) {
   // The two charts are one above the other: the same room for labels on
   // both sides keeps their time axes in line.
   const gutter = { left: 52, right: Math.max(endLabelWidth(qSeries), anyFailures ? endLabelWidth(fSeries) : 0) };
-  parts.push(chartCard(qSeries.length > 1 ? "Queries and blocked queries" : "Queries", "per " + stepName(timeline.step) + ", " + rangeLabel,
+  const qWord = filtered ? "Answers" : "Queries";
+  parts.push(chartCard(qSeries.length > 1 ? qWord + " and blocked queries" : qWord, "per " + stepName(timeline.step) + ", " + rangeLabel,
     lineChart({ series: qSeries, times: timeline.times, step, area: true, gutter }), timeTable(qSeries, timeline.times, step),
     { wide: true, legend: qSeries.length > 1 ? legend(qSeries) : null }));
 
@@ -117,19 +147,20 @@ export async function render(el, params, query) {
   scheduleRefresh(el, params, query, gen);
 }
 
-async function loadAll(since, heatSince, queryLog) {
+async function loadAll(since, heatSince, queryLog, vf, filtered) {
   const p = {
-    summary: get("/stats/summary", { since, top: 0 }),
-    timeline: get("/stats/timeline", { since, key: "queries,blocked" }),
-    errors: get("/stats/timeline", { since, key: failures.map((f) => f.key).join(",") }),
-    heat: get("/stats/heatmap", { since: heatSince }),
+    summary: get("/stats/summary", { since, top: 0, ...vf }),
+    timeline: get("/stats/timeline", { since, key: "queries,blocked", ...vf }),
+    errors: get("/stats/timeline", { since, key: failures.map((f) => f.key).join(","), ...vf }),
+    heat: get("/stats/heatmap", { since: heatSince, ...vf }),
     server: get("/stats/server").catch(() => null),
     gauges: get("/stats/timeline", { since, key: gaugeKeys.join(",") }),
   };
   const groups = ["qtype", "rcode", "view", "zone", "answer", "rtt", "blocklist"];
-  groups.forEach((g) => { p["b_" + g] = get("/stats/breakdown", { group: g, since }); });
+  // With some views only, named's own counters aren't asked for.
+  groups.forEach((g) => { p["b_" + g] = filtered && !perViewGroups.includes(g) ? Promise.resolve([]) : get("/stats/breakdown", { group: g, since, ...vf }); });
   if (queryLog) {
-    for (const k of ["name", "client", "nxdomain", "refused", "servfail", "blocked", "blocked_client"]) p["t_" + k] = get("/stats/top", { kind: k, since, limit: 15 });
+    for (const k of ["name", "client", "nxdomain", "refused", "servfail", "blocked", "blocked_client"]) p["t_" + k] = get("/stats/top", { kind: k, since, limit: 15, ...vf });
   }
   const keys = Object.keys(p);
   const vals = await Promise.all(Object.values(p));
@@ -162,11 +193,26 @@ function complete(tl) {
   return tl;
 }
 
-function filterRow(since) {
-  return h("div", { class: "filter-row", role: "group", "aria-label": "Time range" },
+function filterRow(since, views, off) {
+  const range = h("div", { class: "filter-row", role: "group", "aria-label": "Time range" },
     h("span", { class: "muted" }, "Range"),
     h("div", { class: "segmented" }, ranges.map(([k, label]) =>
       h("a", { href: "#/stats?since=" + k, class: k === since ? "active" : "", "aria-current": k === since ? "true" : null, title: "last " + label }, k))));
+  if (!views || views.length < 2) return range;
+  // A toggle per view (together: linked views, say), and all or none.
+  const set = (next) => { saveViewsOff(next); rerender(); };
+  const toggles = views.map((v) => {
+    const on = !off.has(v);
+    return h("button", { type: "button", class: "chip toggle-chip" + (on ? " on" : ""), "aria-pressed": on ? "true" : "false",
+      title: on ? "Leave view " + v + " out" : "Include view " + v,
+      onclick: () => { const n = new Set(off); if (on) n.add(v); else n.delete(v); set(n); } }, v);
+  });
+  return h("div", { class: "filter-rows" }, range,
+    h("div", { class: "filter-row", role: "group", "aria-label": "Views" },
+      h("span", { class: "muted" }, "Views"),
+      h("div", { class: "chips" }, toggles),
+      h("button", { type: "button", class: "small", disabled: off.size === 0, onclick: () => set(new Set()) }, "All"),
+      h("button", { type: "button", class: "small", disabled: off.size === views.length, onclick: () => set(new Set(views)) }, "None")));
 }
 
 const gaugeKeys = ["g:named:rss", "g:named:mem", "g:cache:mem", "g:named:cpu"];

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

@@ -21,6 +21,7 @@ export async function render(el, params, query) {
     zone.type === "primary" ? ["file", "Zone file"] : null,
     ["primary", "secondary", "mirror"].includes(zone.type) ? ["servers", "Name servers"] : null,
     zone.type === "primary" ? ["dnssec", "DNSSEC"] : null,
+    zone.other_views ? ["compare", "Compare views"] : null,
     zone.registrar && state.me && state.me.admin ? ["registrar", "Registrar"] : null,
   ].filter(Boolean);
   const body = h("div");
@@ -64,6 +65,7 @@ export async function render(el, params, query) {
   else if (tab === "servers") await serversTab(body, zone);
   else if (tab === "dnssec") await dnssecTab(body, zone);
   else if (tab === "registrar") await registrarTab(body, zone);
+  else if (tab === "compare") await compareTab(body, zone);
   // A later click (another tab) has taken over the page.
   if (seq !== renderSeq || !holder.isConnected) return;
   holder.replaceWith(body);
@@ -71,6 +73,40 @@ export async function render(el, params, query) {
   if (first) first.focus();
 }
 
+// ---- comparing a zone across views
+
+// compareTab shows the names and types that differ between the views that
+// have the zone, with a button to share one view's version (linked zones).
+async function compareTab(el, zone) {
+  let all = false;
+  const out = h("div");
+  const draw = async () => {
+    const r = await get("/zones/" + zone.id + "/compare", { all: all ? 1 : "" });
+    const head = h("tr", null, h("th", null, "Name"), h("th", null, "Type"), r.views.map((v) => h("th", null, v)));
+    const rows = r.rows.map((row) => h("tr", { class: row.same ? "muted" : "" },
+      h("td", { class: "mono" }, row.name), h("td", null, h("strong", null, row.type)),
+      row.views.map((vs) => h("td", { class: "compare-cell" },
+        vs.records.length ? vs.records.map((d) => h("div", { class: "mono small" }, d)) : h("span", { class: "muted" }, "–"),
+        vs.linked === "local" ? [badge("only " + vs.view, "accent"), " "] : null,
+        r.linked && !row.same && vs.records.length ? h("button", { class: "small", title: "Make view " + vs.view + "'s version every view's: the others' records of this name and type are replaced",
+          onclick: () => share(vs, row) }, "Use this version") : null))));
+    mount(out,
+      h("p", { class: "muted" }, r.same + " names and types are the same in " + r.views.join(", ") + (r.rows.length && !all ? "; these differ." : ".") + " ",
+        r.linked ? "The zones are linked: shared records are kept in step, and a view's own records override them there." : "The zones aren't linked: a change in one doesn't reach the others. Link them (Link… above) to keep what is the same in step; linking changes no answer."),
+      r.rows.length ? h("div", { class: "table-wrap" }, h("table", { class: "compare" }, h("thead", null, head), h("tbody", null, rows))) : h("div", { class: "empty" }, "Nothing differs."),
+      h("label", { class: "check" }, h("input", { type: "checkbox", checked: all, onchange: (e) => { all = e.target.checked; draw(); } }), "Show what is the same too"));
+  };
+  const share = async (vs, row) => {
+    if (!await confirmDialog("Use view " + vs.view + "'s " + row.name + " " + row.type, "Every view gets " + vs.records.join(", ") + " for " + row.name + " " + row.type + ", shared from now on; the other views' records of that name and type are replaced.", "Use this version")) return;
+    try {
+      toast(describeResult(await change("PATCH", "/records/" + vs.ids[0], { local: false })));
+      await draw();
+    } catch (e) { toast(e.message, "err", 8000); }
+  };
+  await draw();
+  mount(el, out);
+}
+
 // ---- linked zones (docs/views.md#linked-zones)
 
 // linkButton links the zone with the same zone in other views, or takes
@@ -625,7 +661,7 @@ async function recordsTab(el, zone, query) {
     const eTTL = input({ type: "number", value: r.ttl ?? "", placeholder: "default", style: { width: "90px" } });
     const eData = input({ value: r.type === "TXT" && r.text !== undefined ? r.text : r.data, class: "mono", style: { width: "100%" } });
     const eComment = input({ value: r.comment || "", style: { width: "100%" } });
-    const ePTR = checkbox("update PTR", false);
+    const ePTR = checkbox("update PTR", false, { title: "Keep the PTR record in the reverse zone in step: moved with a new name or address, or added if it is missing" });
     const eErr = h("div");
     const save = async () => {
       const body = {};
@@ -638,7 +674,9 @@ async function recordsTab(el, zone, query) {
       else if (eTTL.value !== "" && Number(eTTL.value) !== r.ttl) body.ttl = Number(eTTL.value);
       if (eComment.value !== (r.comment || "")) body.comment = eComment.value;
       if (ePTR.input.checked) body.ptr = true;
-      if (Object.keys(body).length === 0 || (Object.keys(body).length === 1 && body.ptr)) { editing = null; draw(); return; }
+      // "update PTR" alone adds a missing PTR record (the reverse zone may
+      // be newer than the record).
+      if (Object.keys(body).length === 0) { editing = null; draw(); return; }
       try {
         const res = await change("PATCH", "/records/" + r.id, body);
         toast(describeResult(res));

internal/web/static/assets/style.css

@@ -522,3 +522,48 @@ table.pick-list tr.pick.selected { background: var(--accent-soft); }
 /* Encrypted DNS: a protocol per line with its port. */
 .enc-ports > div { margin: 2px 0; }
 .enc-ports input[type=number] { display: inline-block; }
+
+/* Statistics: views switched on and off. */
+.filter-rows { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
+.filter-rows .filter-row { margin-bottom: 0; }
+.filter-row .chips { display: flex; flex-wrap: wrap; gap: 6px; }
+.chip.toggle-chip { opacity: 0.55; font-size: 13px; padding: 3px 12px; }
+.chip.toggle-chip.on { opacity: 1; text-decoration: none; background: var(--accent-soft); border-color: var(--accent); }
+
+/* Drop-down menus in the top bar (Server, the user). */
+details.menu { position: relative; }
+details.menu > summary { list-style: none; cursor: pointer; padding: 6px 10px; border-radius: var(--radius); color: var(--text); white-space: nowrap; }
+details.menu > summary::-webkit-details-marker { display: none; }
+details.menu > summary:hover, details.menu[open] > summary { background: var(--info-soft); }
+details.menu > summary.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
+details.menu > summary .caret { margin-left: 4px; font-size: 0.8em; opacity: 0.7; }
+details.menu > summary .user { color: inherit; }
+details.menu .menu-list {
+  position: absolute; top: calc(100% + 4px); left: 0; z-index: 20; min-width: 190px;
+  display: flex; flex-direction: column; padding: 4px;
+  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
+  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
+}
+details.menu.right .menu-list { left: auto; right: 0; }
+details.menu .menu-list a, details.menu .menu-list .menu-item {
+  display: block; padding: 7px 10px; border-radius: var(--radius); color: var(--text); text-align: left;
+  background: none; border: 0; font: inherit; cursor: pointer; white-space: nowrap;
+}
+details.menu .menu-list a:hover, details.menu .menu-list .menu-item:hover { background: var(--info-soft); text-decoration: none; }
+details.menu .menu-list a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
+nav.main { align-items: center; }
+header.top .header-right { display: flex; align-items: center; gap: 12px; margin-left: auto; }
+@media (max-width: 1200px) {
+  header.top form.search input { width: 160px; }
+  header.top { gap: 10px; }
+}
+
+/* Encrypted DNS: the health of each listener. */
+ul.probes { list-style: none; padding: 0; margin: 0 0 8px; }
+ul.probes > li { padding: 6px 0; border-bottom: 1px solid var(--border); }
+ul.probes > li .msg { margin: 6px 0 0; }
+
+/* Comparing a zone across views. */
+table.compare td.compare-cell { vertical-align: top; }
+table.compare td.compare-cell button { margin-top: 4px; }
+table.compare tr.muted td { color: var(--muted); }

scripts/e2e.sh

@@ -377,6 +377,15 @@ run "user delete" 0 $J user delete certbot -y
 run "audit" 0 $J audit --limit 10
 contains "token.revoke"
 
+# A reverse zone created after the record: "update PTR" alone adds it.
+run "an address record" 0 $J record add adbraun.test ldn A 192.0.2.154
+run "its /32 reverse zone, afterwards" 0 $J zone create 192.0.2.154/32
+LDN=$($J record list adbraun.test --name ldn -o id)
+run "record update --ptr adds the missing PTR" 0 $J record update $LDN --ptr
+expect_dig "the PTR is served" "ldn.adbraun.test." -x 192.0.2.154
+run "remove the reverse zone again" 0 $J zone delete 154.2.0.192.in-addr.arpa -y
+run "and the record" 0 $J record delete adbraun.test ldn A -y
+
 # Views
 run "view create (adopts zones)" 0 $J view create internal --match-clients homelab --adopt-zones
 run "view create external" 0 $J view create external --match-clients any
@@ -409,11 +418,20 @@ expect_dig "now every view's" "10.1.1.1" -k $E/external.key linked.adbraun.test
 run "--view all changes a link once" 0 $J record set adbraun.test linked A 10.1.1.2 --view all
 contains "linked with internal"
 expect_dig "both views" "10.1.1.2" -k $E/external.key linked.adbraun.test A
+run "zone diff: what differs between the views" 0 $J zone diff adbraun.test
+contains "ns1  *A  *127.0.0.1 \\[local, id [0-9]*\\]  *203.0.113.1 \\[local, id [0-9]*\\]"
+contains "names and types differ, [0-9]* are the same; linked"
+run "the compare API" 0 curl -sf -H "Authorization: Bearer $(cat $E/admin.token)" "http://127.0.0.1:$HTTP/api/v1/zones/adbraun.test/compare?view=internal&all=1"
+contains '"linked":true'
 run "a shared delete" 0 $J record delete adbraun.test linked A --view external -y
 expect_dig "gone from internal too" "" linked.adbraun.test A
 run "zone unlink" 0 $J zone unlink adbraun.test --view external
 run "unlinked: no link column" 0 $J record list adbraun.test --view external
 not_contains "shared"
+run "--local on a zone that isn't linked is fine" 0 $J record add adbraun.test solo A 10.9.9.9 --view external --local
+run "--shared there is refused (exit 6)" 6 $J record add adbraun.test solo2 A 10.9.9.8 --view external --shared
+contains "nothing to share"
+run "remove it" 0 $J record delete adbraun.test solo A --view external -y
 run "zone create --link-with: a linked copy" 0 $J zone create linkcopy.test --view internal --ns ns1.adbraun.test.
 run "a record in it" 0 $J record add linkcopy.test www A 192.0.2.80 --view internal
 run "copy it into external, linked" 0 $J zone create linkcopy.test --view external --link-with internal
@@ -435,6 +453,13 @@ contains "rate-limit { responses-per-second 10; log-only yes; };"
 run "exposure: log-only now" 0 $J exposure
 contains "^external  *public  *log-only"
 contains "exposure_rate_limit_log_only"
+# Statistics are off here; render/stats_test.go covers their statements.
+run "what Jarl adds by itself" 0 $J option generated
+contains "^include .*keys.conf"
+contains 'match-clients { !key "jarl-view-external"; key "jarl-view-internal"; ... };'
+not_contains "statistics-channels"
+run "generated, as JSON" 0 $J option generated -o json
+contains '"setting": "always, when there are views"'
 run "fix: start enforcing" 0 $J exposure fix external exposure_rate_limit_log_only
 contains "responses-per-second 10; }"
 # A burst of identical queries in the external view (signed with its key):
@@ -783,6 +808,13 @@ if [ -n "$PEBBLE" ]; then
 	contains "^192.168.1.20$"
 	run "plain DNS still answers on port 53's listener" 0 $DIG +short -p $DNS @127.0.0.1 nas.adbraun.test A
 	contains "^192.168.1.20$"
+	run "encrypted-dns health: both listeners work" 0 $J encrypted-dns health
+	contains "DoT 127.0.0.1 port $EDOT: *working (NOERROR"
+	contains "DoH 127.0.0.1 port $EDOH: *working"
+	contains "isn't from a CA this server trusts"
+	sleep 16   # /metrics caches Jarl's state for 15 seconds
+	run "health metric" 0 curl -sf http://127.0.0.1:$HTTP/metrics
+	contains "^jarl_encrypted_dns_up{kind=\"dot\",address=\"127.0.0.1\",port=\"$EDOT\"} 1$"
 	run "a certificate named uses can't be deleted (exit 6)" 6 $J cert delete ns1 --yes
 	contains "take it out first"
 	run "encrypted-dns disable" 0 $J encrypted-dns disable