+ client: handle DNSSEC setting

client/src/__locales/en.json

@@ -479,5 +479,7 @@
     "install_static_configure": "We have detected that a dynamic IP address is used — <0>{{ip}}</0>. Do you want to use it as your static address?",
     "confirm_static_ip": "AdGuard Home will configure {{ip}} to be your static IP address. Do you want to proceed?",
     "list_updated": "{{count}} list updated",
-    "list_updated_plural": "{{count}} lists updated"
+    "list_updated_plural": "{{count}} lists updated",
+    "dnssec_enable": "Enable DNSSEC",
+    "dnssec_enable_desc": "Set DNSSEC flag in the outcoming DNS queries and check the result (DNSSEC-enabled resolver is required)"
 }

client/src/components/Settings/Dns/Config/Form.js

@@ -65,6 +65,18 @@ let Form = ({
                     />
                 </div>
             </div>
+            <div className="col-12">
+                <div className="form__group form__group--settings">
+                    <Field
+                        name="dnssec_enabled"
+                        type="checkbox"
+                        component={renderSelectField}
+                        placeholder={t('dnssec_enable')}
+                        disabled={processing}
+                        subtitle={t('dnssec_enable_desc')}
+                    />
+                </div>
+            </div>
             <div className="col-12">
                 <div className="form__group form__group--settings">
                     <Field

client/src/components/Settings/Dns/Config/index.js

@@ -16,6 +16,7 @@ const Config = ({ t, dnsConfig, setDnsConfig }) => {
         blocking_ipv4,
         blocking_ipv6,
         edns_cs_enabled,
+        dnssec_enabled,
         disable_ipv6,
         processingSetConfig,
     } = dnsConfig;
@@ -35,6 +36,7 @@ const Config = ({ t, dnsConfig, setDnsConfig }) => {
                         blocking_ipv6,
                         edns_cs_enabled,
                         disable_ipv6,
+                        dnssec_enabled,
                     }}
                     onSubmit={handleFormSubmit}
                     processing={processingSetConfig}

client/src/reducers/dnsConfig.js

@@ -45,6 +45,7 @@ const dnsConfig = handleActions(
         blocking_ipv6: DEFAULT_BLOCKING_IPV6,
         edns_cs_enabled: false,
         disable_ipv6: false,
+        dnssec_enabled: false,
     },
 );