[UI][core] Fix interface not being updated in thinclient

When changing the interface in both `GTK` and `ConsoleUI`, we call
directly to `deluge.common.is_interface`, which checks the interface on
the local machine and not on the daemon's machine.

The `WebUI` does not seem to have any validation on input.

closes: https://dev.deluge-torrent.org/ticket/3540

deluge/core/core.py

@@ -817,6 +817,11 @@ def set_config(self, config: Dict[str, Any]):
                 continue
             self.config[key] = config[key]
 
+    @export
+    def is_valid_interface(self, interface: str) -> bool:
+        """Returns True is valid interface"""
+        return deluge.common.is_interface(interface)
+
     @export
     def get_listen_port(self) -> int:
         """Returns the active listen port"""

deluge/ui/console/modes/preferences/preference_panes.py

@@ -8,7 +8,6 @@
 
 import logging
 
-from deluge.common import is_interface
 from deluge.decorators import overrides
 from deluge.i18n import get_languages
 from deluge.ui.client import client
@@ -91,11 +90,19 @@ def add_config_values(self, conf_dict):
                     )
                 elif ipt.name == 'listen_interface':
                     listen_interface = ipt.get_value().strip()
-                    if is_interface(listen_interface) or not listen_interface:
+                    if (
+                        client.is_daemon_version_equal_or_greater('2.1.1')
+                        and client.core.is_valid_interface(listen_interface)
+                        or not listen_interface
+                    ):
                         conf_dict['listen_interface'] = listen_interface
                 elif ipt.name == 'outgoing_interface':
                     outgoing_interface = ipt.get_value().strip()
-                    if is_interface(outgoing_interface) or not outgoing_interface:
+                    if (
+                        client.is_daemon_version_equal_or_greater('2.1.1')
+                        and client.core.is_valid_interface(outgoing_interface)
+                        or not outgoing_interface
+                    ):
                         conf_dict['outgoing_interface'] = outgoing_interface
                 elif ipt.name.startswith('proxy_'):
                     if ipt.name == 'proxy_type':

deluge/ui/gtk3/preferences.py

@@ -676,15 +676,21 @@ def set_config(self, hide=False):
             'chk_random_outgoing_ports'
         ).get_active()
         incoming_address = self.builder.get_object('entry_interface').get_text().strip()
-        if deluge.common.is_interface(incoming_address) or not incoming_address:
+        if (
+            client.is_daemon_version_equal_or_greater('2.1.1')
+            and client.core.is_valid_interface(incoming_address)
+            or not incoming_address
+        ):
             new_core_config['listen_interface'] = incoming_address
         outgoing_address = (
             self.builder.get_object('entry_outgoing_interface').get_text().strip()
         )
-        if deluge.common.is_interface(outgoing_address) or not outgoing_address:
-            new_core_config['outgoing_interface'] = (
-                self.builder.get_object('entry_outgoing_interface').get_text().strip()
-            )
+        if (
+            client.is_daemon_version_equal_or_greater('2.1.1')
+            and client.core.is_valid_interface(outgoing_address)
+            or not outgoing_address
+        ):
+            new_core_config['outgoing_interface'] = outgoing_address
         new_core_config['peer_tos'] = self.builder.get_object(
             'entry_peer_tos'
         ).get_text()

deluge/ui/web/js/deluge-all/preferences/NetworkPage.js

@@ -35,7 +35,7 @@ Deluge.preferences.Network = Ext.extend(Ext.form.FormPanel, {
         fieldset = this.add({
             xtype: 'fieldset',
             border: false,
-            title: _('Incoming Address'),
+            title: _('Incoming Interface'),
             style: 'margin-bottom: 5px; padding-bottom: 0px;',
             autoHeight: true,
             labelWidth: 1,