Pull request: home: don't miss blocked clients in client search api

Merge in DNS/adguard-home from 2428-blocked-runtime-fix to master

Updates #2428.

Squashed commit of the following:

commit 8aaa3e22a894f0335ced93339655771989846c94
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Jan 15 16:32:53 2021 +0300

    home: don't miss blocked clients in client search api

internal/home/clientshttp.go

@@ -233,24 +233,22 @@ func (clients *clientsContainer) handleFindClient(w http.ResponseWriter, r *http
 		if len(ip) == 0 {
 			break
 		}
+
 		el := map[string]interface{}{}
 		c, ok := clients.Find(ip)
+		var cj clientJSON
 		if !ok {
-			ch, ok := clients.FindAutoClient(ip)
-			if !ok {
-				continue // a client with this IP isn't found
+			var found bool
+			cj, found = clients.findTemporary(ip)
+			if !found {
+				continue
 			}
-			cj := clientHostToJSON(ip, ch)
-
-			cj.Disallowed, cj.DisallowedRule = clients.dnsServer.IsBlockedIP(ip)
-			el[ip] = cj
 		} else {
-			cj := clientToJSON(&c)
-
+			cj = clientToJSON(&c)
 			cj.Disallowed, cj.DisallowedRule = clients.dnsServer.IsBlockedIP(ip)
-			el[ip] = cj
 		}
 
+		el[ip] = cj
 		data = append(data, el)
 	}
 
@@ -267,6 +265,36 @@ func (clients *clientsContainer) handleFindClient(w http.ResponseWriter, r *http
 	}
 }
 
+// findTemporary looks up the IP in temporary storages, like autohosts or
+// blocklists.
+func (clients *clientsContainer) findTemporary(ip string) (cj clientJSON, found bool) {
+	ch, ok := clients.FindAutoClient(ip)
+	if !ok {
+		// It is still possible that the IP used to be in the runtime
+		// clients list, but then the server was reloaded.  So, check
+		// the DNS server's blocked IP list.
+		//
+		// See https://github.com/AdguardTeam/AdGuardHome/issues/2428.
+		disallowed, rule := clients.dnsServer.IsBlockedIP(ip)
+		if rule == "" {
+			return clientJSON{}, false
+		}
+
+		cj = clientJSON{
+			IDs:            []string{ip},
+			Disallowed:     disallowed,
+			DisallowedRule: rule,
+		}
+
+		return cj, true
+	}
+
+	cj = clientHostToJSON(ip, ch)
+	cj.Disallowed, cj.DisallowedRule = clients.dnsServer.IsBlockedIP(ip)
+
+	return cj, true
+}
+
 // RegisterClientsHandlers registers HTTP handlers
 func (clients *clientsContainer) registerWebHandlers() {
 	httpRegister("GET", "/control/clients", clients.handleGetClients)

internal/home/control_test.go

@@ -68,8 +68,8 @@ kXS9jgARhhiWXJrk
 		data.KeyType == "RSA" &&
 		data.Subject == "CN=AdGuard Home,O=AdGuard Ltd" &&
 		data.Issuer == "CN=AdGuard Home,O=AdGuard Ltd" &&
-		data.NotBefore == notBefore &&
-		data.NotAfter == notAfter &&
+		data.NotBefore.Equal(notBefore) &&
+		data.NotAfter.Equal(notAfter) &&
 		// data.DNSNames[0] ==  &&
 		data.ValidPair) {
 		t.Fatalf("valid cert & priv key: validateCertificates(): %v", data)

internal/home/controlinstall.go

@@ -109,7 +109,7 @@ func (web *Web) handleInstallCheckConfig(w http.ResponseWriter, r *http.Request)
 	if reqData.Web.Port != 0 && reqData.Web.Port != config.BindPort && reqData.Web.Port != config.BetaBindPort {
 		err = util.CheckPortAvailable(reqData.Web.IP, reqData.Web.Port)
 		if err != nil {
-			respData.Web.Status = fmt.Sprintf("%v", err)
+			respData.Web.Status = err.Error()
 		}
 	}
 
@@ -137,7 +137,7 @@ func (web *Web) handleInstallCheckConfig(w http.ResponseWriter, r *http.Request)
 		}
 
 		if err != nil {
-			respData.DNS.Status = fmt.Sprintf("%v", err)
+			respData.DNS.Status = err.Error()
 		} else if reqData.DNS.IP != "0.0.0.0" {
 			respData.StaticIP = handleStaticIP(reqData.DNS.IP, reqData.SetStaticIP)
 		}