Encrypted DNS health, comparing a zone's views, --local everywhere

jarld checks the DoT and DoH listeners every 10 minutes as a client would (page, dashboard, jarl encrypted-dns health, jarl_encrypted_dns_up). The Compare views tab and jarl zone diff show what differs between a zone's views, with Use this version. --local works on unlinked zones. A changed certificates.dir is followed by encrypted DNS's tls statements. Sharing an already shared version replaces other views' overrides.

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

internal/server/server.go

@@ -4,6 +4,7 @@ package server
 import (
 	"context"
 	"crypto/tls"
+	"crypto/x509"
 	"errors"
 	"fmt"
 	"io/fs"
@@ -21,6 +22,7 @@ import (
 	"jarl/internal/api"
 	"jarl/internal/auth"
 	"jarl/internal/certs"
+	"jarl/internal/encdns"
 	"jarl/internal/engine"
 	"jarl/internal/nscheck"
 	"jarl/internal/porkbun"
@@ -90,6 +92,13 @@ 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
 
 	mu   sync.Mutex
 	srvs []*http.Server
@@ -226,6 +235,14 @@ func (s *Server) Serve(ctx context.Context, ready func()) error {
 		ready()
 	}
 	go s.housekeeping(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 +317,7 @@ 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()
 			}