New reverse zone: pick from the networks your records use, sized around them

The Zones page's New reverse zone lists every network the records use without a reverse zone, in every view, also where nothing is suggested (suggestions off, dismissed, public views), marked. Picking one fills in the network and view; size buttons (/48 /56 /64 /128, /16 /24 /32) re-mask it around a record's address, so a /48 becomes the records' own /64. Fill stays on. jarl zone suggest-reverse --all [--view V]; GET /reverse-zones/suggestions?all=1&view=.

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

internal/engine/reverse.go

@@ -261,7 +261,10 @@ type ReverseSuggestion struct {
 	// Group is "yours" for networks that are yours for sure (private
 	// ranges, IPv6 prefixes this server has an address in), "public" for
 	// a public address that may be someone else's (a web host's).
-	Group   string   `json:"group"`
+	Group string `json:"group"`
+	// Hidden says why the suggestion isn't made unasked (with All only):
+	// "public view", "suggestions off" or "dismissed".
+	Hidden  string   `json:"hidden,omitempty"`
 	Why     string   `json:"why"`
 	Fill    int      `json:"fill"`    // PTR records creating it with fill adds
 	Samples []string `json:"samples"` // a few of them, "address name"
@@ -285,6 +288,22 @@ const (
 // Public views, views with suggestions turned off and dismissed networks
 // get none: the internet asks the addresses' owners.
 func ReverseSuggestions(st *model.State, exposures []validate.Exposure, local []netip.Addr) []ReverseSuggestion {
+	return ReverseCandidates(st, exposures, local, ReverseOptions{})
+}
+
+// ReverseOptions widen or narrow ReverseCandidates.
+type ReverseOptions struct {
+	// All includes what isn't suggested unasked, marked Hidden: public
+	// views, views with suggestions off, dismissed networks.
+	All bool
+	// View narrows it to one view (by name; "" all).
+	View string
+}
+
+// ReverseCandidates is ReverseSuggestions with options: with All, every
+// network the views' records use that no reverse zone in their view
+// covers, for creating one by hand where suggestions are off.
+func ReverseCandidates(st *model.State, exposures []validate.Exposure, local []netip.Addr, opt ReverseOptions) []ReverseSuggestion {
 	public := map[int64]bool{}
 	for _, e := range exposures {
 		public[e.ViewID] = e.Public
@@ -292,16 +311,31 @@ func ReverseSuggestions(st *model.State, exposures []validate.Exposure, local []
 	type scope struct {
 		id        int64
 		dismissed []string
+		hidden    string
 	}
 	var scopes []scope
 	if len(st.Views) > 0 {
 		for _, v := range st.OrderedViews() {
-			if !public[v.ID] && !v.ReverseSuggestionsOff {
-				scopes = append(scopes, scope{v.ID, v.DismissedReverse})
+			if opt.View != "" && !strings.EqualFold(v.Name, opt.View) {
+				continue
+			}
+			hidden := ""
+			switch {
+			case public[v.ID]:
+				hidden = "public view"
+			case v.ReverseSuggestionsOff:
+				hidden = "suggestions off"
+			}
+			if hidden == "" || opt.All {
+				scopes = append(scopes, scope{v.ID, v.DismissedReverse, hidden})
 			}
 		}
-	} else if !public[0] {
-		scopes = append(scopes, scope{0, st.Settings.DismissedReverse})
+	} else if !public[0] || opt.All {
+		hidden := ""
+		if public[0] {
+			hidden = "public server"
+		}
+		scopes = append(scopes, scope{0, st.Settings.DismissedReverse, hidden})
 	}
 	out := []ReverseSuggestion{}
 	for _, sc := range scopes {
@@ -315,15 +349,24 @@ func ReverseSuggestions(st *model.State, exposures []validate.Exposure, local []
 				continue
 			}
 			p, group, why := suggestedPrefix(a, local)
-			if seen[p] || slices.Contains(sc.dismissed, p.String()) {
+			hidden := sc.hidden
+			if seen[p] {
 				continue
 			}
+			if slices.Contains(sc.dismissed, p.String()) {
+				if !opt.All {
+					continue
+				}
+				if hidden == "" {
+					hidden = "dismissed"
+				}
+			}
 			seen[p] = true
 			name, err := dnsname.ReverseZone(p)
 			if err != nil {
 				continue
 			}
-			s := ReverseSuggestion{ViewID: sc.id, View: viewName(st, sc.id), Prefix: p.String(), Zone: strings.TrimSuffix(name, "."), Group: group, Why: why, Samples: []string{}}
+			s := ReverseSuggestion{ViewID: sc.id, View: viewName(st, sc.id), Prefix: p.String(), Zone: strings.TrimSuffix(name, "."), Group: group, Hidden: hidden, Why: why, Samples: []string{}}
 			fills := PTRFills(st, sc.id, name, nil)
 			s.Fill = len(fills)
 			for i, f := range fills {
@@ -365,13 +408,14 @@ func suggestedPrefix(a netip.Addr, local []netip.Addr) (netip.Prefix, string, st
 	return netip.PrefixFrom(a, 128), SuggestPublic, "a public address outside this server's networks: create it only if it is yours"
 }
 
-// ReverseSuggestions lists the reverse zones the private views lack.
-func (e *Engine) ReverseSuggestions(st *model.State) []ReverseSuggestion {
+// ReverseSuggestions lists the reverse zones the views lack (opt.All:
+// also where suggestions aren't made unasked).
+func (e *Engine) ReverseSuggestions(st *model.State, opt ReverseOptions) []ReverseSuggestion {
 	var local []netip.Addr
 	if e.cfg.LocalAddrs != nil {
 		local = e.cfg.LocalAddrs()
 	}
-	return ReverseSuggestions(st, e.Exposures(st), local)
+	return ReverseCandidates(st, e.Exposures(st), local, opt)
 }
 
 // reverseDismiss expands reverse.dismiss and reverse.undismiss.