Chore: Add validation

Author: BornToBeRoot

Source/NETworkManager.Models/Network/SNTPLookup.cs

@@ -101,7 +101,7 @@ public void QueryAsync(IEnumerable<ServerConnectionInfo> servers, bool dnsResolv
                 // NTP requires an IP address to connect to
                 IPAddress serverIP = null;
 
-                if (IPAddress.TryParse(server.Server, out var address) && (address.AddressFamily == AddressFamily.InterNetwork || address.AddressFamily == AddressFamily.InterNetworkV6))
+                if (IPAddress.TryParse(server.Server, out var address) && address.AddressFamily is AddressFamily.InterNetwork or AddressFamily.InterNetworkV6)
                 {
                     serverIP = address;
                 }

Source/NETworkManager.Validators/IPAddressOrHostnameAsRangeValidator.cs

@@ -1,4 +1,5 @@
 using System.Globalization;
+using System.Net;
 using System.Text.RegularExpressions;
 using System.Windows.Controls;
 using NETworkManager.Localization.Resources;
@@ -19,11 +20,10 @@ public override ValidationResult Validate(object value, CultureInfo cultureInfo)
         {
             var localItem = item.Trim();
 
-            // Check if it is a valid IPv4 address like 192.168.0.1, a valid IPv6 address like ::1 or a valid hostname like server-01 or server-01.example.com
-            var isValid = Regex.IsMatch(localItem, RegexHelper.IPv4AddressRegex) ||
-                          Regex.IsMatch(localItem, RegexHelper.IPv6AddressRegex) ||
+            // Check if it is a valid IPv4 address like 192.168.0.1, a valid IPv6 address like "::1" or a valid hostname like "server-01" or "server-01.example.com"
+            var isValid = (IPAddress.TryParse(localItem, out var ipAddress) && ipAddress.AddressFamily is System.Net.Sockets.AddressFamily.InterNetwork or System.Net.Sockets.AddressFamily.InterNetworkV6) ||
                           Regex.IsMatch(localItem, RegexHelper.HostnameOrDomainRegex);
-
+            
             if (!isValid)
                 return new ValidationResult(false, Strings.EnterValidHostnameOrIPAddress);
         }

Source/NETworkManager.Validators/MultipleIPAddressesValidator.cs

@@ -1,24 +1,22 @@
 using System.Globalization;
-using System.Text.RegularExpressions;
+using System.Net;
 using System.Windows.Controls;
 using NETworkManager.Localization.Resources;
-using NETworkManager.Utilities;
 
 namespace NETworkManager.Validators;
 
 public class MultipleIPAddressesValidator : ValidationRule
 {
     public override ValidationResult Validate(object value, CultureInfo cultureInfo)
     {
-        if (value == null)
-            return ValidationResult.ValidResult;
-
-        for (var index = 0; index < ((string)value).Split(';').Length; index++)
+        var ipAddresses = (value as string)?.Split(';');
+        
+        if (ipAddresses == null || ipAddresses.Length == 0)
+            return new ValidationResult(false, Strings.EnterOneOrMoreValidIPAddresses);
+        
+        foreach (var ipAddress in ipAddresses)
         {
-            var ipAddress = ((string)value).Split(';')[index];
-
-            if (!Regex.IsMatch(ipAddress.Trim(), RegexHelper.IPv4AddressRegex) &&
-                !Regex.IsMatch(ipAddress.Trim(), RegexHelper.IPv6AddressRegex))
+            if(!(IPAddress.TryParse(ipAddress, out var ip) && ip.AddressFamily is System.Net.Sockets.AddressFamily.InterNetwork or System.Net.Sockets.AddressFamily.InterNetworkV6))
                 return new ValidationResult(false, Strings.EnterOneOrMoreValidIPAddresses);
         }
 

Source/NETworkManager/Views/SettingsNetworkView.xaml

@@ -20,6 +20,7 @@
             <TextBox.Text>
                 <Binding Path="CustomDNSServer" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">
                     <Binding.ValidationRules>
+                        <validators:EmptyValidator ValidatesOnTargetUpdated="True" />
                         <validators:MultipleIPAddressesValidator ValidatesOnTargetUpdated="True" />
                     </Binding.ValidationRules>
                 </Binding>