fix a bug when dns is not specified

Author: Cenmrev

V2RayX/ConfigWindowController.m

@@ -29,7 +29,11 @@ - (void)windowDidLoad {
     NSDictionary *defaultsDic = [[self delegate] readDefaultsAsDictionary];
     [self setLocalPort:[defaultsDic[@"localPort"] integerValue]];
     [self setUdpSupport:[defaultsDic[@"udpSupport"] boolValue]];
-    [self setDnsString:defaultsDic[@"dns"]];
+    if ([defaultsDic[@"dns"] length] > 0) {
+        [self setDnsString:defaultsDic[@"dns"]];
+    } else {
+        [self setDnsString:@"localhost"];
+    }
     profiles = defaultsDic[@"profiles"];
     [_profileTable reloadData];
     _selectedServerIndex = [defaultsDic[@"selectedServerIndex"] integerValue];
@@ -104,7 +108,11 @@ - (IBAction)okSave:(id)sender {
     }
     [defaults setObject:profileDicArray forKey:@"profiles"];
     [defaults setObject:[NSNumber numberWithInteger:_selectedServerIndex] forKey:@"selectedServerIndex"];
-    [defaults setObject:[[_dnsField stringValue] stringByReplacingOccurrencesOfString:@" " withString:@""] forKey:@"dns"];
+    NSString* dnsStr = [[_dnsField stringValue] stringByReplacingOccurrencesOfString:@" " withString:@""];
+    if ([dnsStr length] == 0) {
+        dnsStr = @"localhost";
+    }
+    [defaults setObject:dnsStr forKey:@"dns"];
     [[self delegate] configurationDidChange];
     [[self window] close];
 }

V2RayX/ServerProfile.m

@@ -63,6 +63,8 @@ - (NSDictionary*)v2rayConfigWithLocalPort:(NSInteger)localPort
     NSArray* dnsArray = [[[NSUserDefaults standardUserDefaults] objectForKey:@"dns"] componentsSeparatedByString:@","];
     if ([dnsArray count] > 0) {
         config[@"dns"][@"servers"] = dnsArray;
+    } else {
+        config[@"dns"][@"servers"] = @[@"localhost"];
     }
     return config;
 }