Feature: HostsFileEditor add/edit

Author: BornToBeRoot

Source/NETworkManager.Localization/Resources/Strings.Designer.cs

@@ -679,7 +679,7 @@
     <value>Apply</value>
   </data>
   <data name="ApplyWindowsKeyCombinationsLikeAltTab" xml:space="preserve">
-    <value>Apply Windows key combinations (e.g. ALT+TAB):</value>
+    <value>Apply Windows key combinations (e.g., ALT+TAB):</value>
   </data>
   <data name="Auth" xml:space="preserve">
     <value>Auth</value>
@@ -1367,16 +1367,16 @@ Profile files are not affected!</value>
     <value>Enter a valid IPv4 address!</value>
   </data>
   <data name="EnterValidMACAddress" xml:space="preserve">
-    <value>Enter a valid MAC address (like 00:F1:23:AB:F2:35)!</value>
+    <value>Enter a valid MAC address (e.g., 00:F1:23:AB:F2:35)!</value>
   </data>
   <data name="EnterValidPort" xml:space="preserve">
     <value>Enter a valid port (1 - 65535)!</value>
   </data>
   <data name="EnterValidSubnetmask" xml:space="preserve">
-    <value>Enter a valid subnetmask (like 255.255.255.0)!</value>
+    <value>Enter a valid subnetmask (e.g., 255.255.255.0)!</value>
   </data>
   <data name="EnterValidSubnetmaskOrCIDR" xml:space="preserve">
-    <value>Enter a valid subnetmask or CIDR (like 255.255.255.0 or /24)!</value>
+    <value>Enter a valid subnetmask or CIDR (e.g., 255.255.255.0 or /24)!</value>
   </data>
   <data name="FieldCannotBeEmpty" xml:space="preserve">
     <value>Field cannot be empty!</value>
@@ -1448,10 +1448,10 @@ Profile files are not affected!</value>
     <value>Enter a valid port and/or port range (1 - 65535)!</value>
   </data>
   <data name="EnterValidSubnet" xml:space="preserve">
-    <value>Enter a valid subnet (like 192.168.178.133/26)!</value>
+    <value>Enter a valid subnet (e.g., 192.168.178.133/26)!</value>
   </data>
   <data name="EnterValidWebsiteUri" xml:space="preserve">
-    <value>Enter a valid website (like https://example.com/index.html)</value>
+    <value>Enter a valid website (e.g., https://example.com/index.html)</value>
   </data>
   <data name="Green" xml:space="preserve">
     <value>Green</value>
@@ -1742,7 +1742,7 @@ Profile files are not affected!</value>
     <value>Add a tab to query whois...</value>
   </data>
   <data name="EnterValidDomain" xml:space="preserve">
-    <value>Enter a valid domain (like "example.com")!</value>
+    <value>Enter a valid domain (e.g., "example.com")!</value>
   </data>
   <data name="WhoisServerNotFoundForTheDomain" xml:space="preserve">
     <value>Whois server not found for the domain: "{0}"</value>
@@ -2032,7 +2032,7 @@ is disabled!</value>
     <value>Use custom IPv4 address API</value>
   </data>
   <data name="HelpMessage_CustomPublicIPv4AddressAPI" xml:space="preserve">
-    <value>URL to a web service that can be reached via http or https and returns an IPv4 address like "xx.xx.xx.xx" as response.</value>
+    <value>URL to a web service that can be reached via http or https and returns an IPv4 address e.g., "xx.xx.xx.xx" as response.</value>
   </data>
   <data name="CouldNotParsePublicIPAddressFromXXXMessage" xml:space="preserve">
     <value>Could not parse public ip address from "{0}"! Try another service or use the default... </value>
@@ -3192,7 +3192,7 @@ If the option is disabled again, the values are no longer modified. However, the
     <value>SNTP server(s)</value>
   </data>
   <data name="HelpMessage_CustomPublicIPv6AddressAPI" xml:space="preserve">
-    <value>URL to a web service that can be reached via http or https and returns an IPv6 address like "xxxx:xx:xxx::xx" as response.</value>
+    <value>URL to a web service that can be reached via http or https and returns an IPv6 address e.g., "xxxx:xx:xxx::xx" as response.</value>
   </data>
   <data name="IPEndPoint" xml:space="preserve">
     <value>IP endpoint</value>
@@ -3234,7 +3234,7 @@ If the option is disabled again, the values are no longer modified. However, the
     <value>An SNTP server with this name already exists!</value>
   </data>
   <data name="EnterValidHostnameOrIPAddress" xml:space="preserve">
-    <value>Enter a valid hostname (like "server-01" or "example.com") or a valid IP address (like 192.168.178.1)!</value>
+    <value>Enter a valid hostname (e.g., "server-01" or "example.com") or a valid IP address (e.g., 192.168.178.1)!</value>
   </data>
   <data name="Servers" xml:space="preserve">
     <value>Server(s)</value>
@@ -3528,10 +3528,10 @@ Changes to this value will take effect after the application is restarted. Wheth
     <value>The settings on this page contain errors. Correct them to be able to save.</value>
   </data>
   <data name="HelpMessage_PuTTYHostkey" xml:space="preserve">
-    <value>SSH hostkey to use for the connection (like "71:b8:f2:6e..."). Only available if the mode is "SSH".</value>
+    <value>SSH hostkey to use for the connection (e.g., "71:b8:f2:6e..."). Only available if the mode is "SSH".</value>
   </data>
   <data name="HelpMessage_PuTTYPrivateKeyFile" xml:space="preserve">
-    <value>Full path to the private key file (like "C:\Users\BornToBeRoot\SSH\private_key.ppk"). Only available if the mode is "SSH".</value>
+    <value>Full path to the private key file (e.g., "C:\Users\BornToBeRoot\SSH\private_key.ppk"). Only available if the mode is "SSH".</value>
   </data>
   <data name="HelpMessage_PuTTYUsername" xml:space="preserve">
     <value>Username that will be passed into the PuTTY session. Only available if the mode is "SSH", "Telnet" or "Rlogin".</value>
@@ -3938,4 +3938,10 @@ Right-click for more options.</value>
 
 {0} {1} {2}</value>
   </data>
+  <data name="ExampleHostsFileEntryComment" xml:space="preserve">
+    <value>Primary DNS server</value>
+  </data>
+  <data name="EnterValidHostsFileEntryHostname" xml:space="preserve">
+    <value>Enter a valid hostname (e.g., "server-01" or "example.com")! Multiple hostnames can be separated with a space.</value>
+  </data>
 </root>

Source/NETworkManager.Localization/Resources/Strings.resx

@@ -26,17 +26,14 @@ public static class RegexHelper
     public const string IPv4AddressRangeRegex = $"^{IPv4AddressValues}-{IPv4AddressValues}$";
 
     // Match a MAC-Address 000000000000 00:00:00:00:00:00, 00-00-00-00-00-00-00 or 0000.0000.0000
-
     public const string MACAddressRegex =
         @"^^[A-Fa-f0-9]{12}$|^[A-Fa-f0-9]{2}(:|-){1}[A-Fa-f0-9]{2}(:|-){1}[A-Fa-f0-9]{2}(:|-){1}[A-Fa-f0-9]{2}(:|-){1}[A-Fa-f0-9]{2}(:|-){1}[A-Fa-f0-9]{2}$|^[A-Fa-f0-9]{4}.[A-Fa-f0-9]{4}.[A-Fa-f0-9]{4}$$";
 
     // Match the first 3 bytes of a MAC-Address 000000, 00:00:00, 00-00-00
-
     public const string MACAddressFirst3BytesRegex =
         @"^[A-Fa-f0-9]{6}$|^[A-Fa-f0-9]{2}(:|-){1}[A-Fa-f0-9]{2}(:|-){1}[A-Fa-f0-9]{2}$|^[A-Fa-f0-9]{4}.[A-Fa-f0-9]{2}$";
 
     // Private subnetmask / cidr values
-
     private const string SubnetmaskValues =
         @"(((255\.){3}(255|254|252|248|240|224|192|128|0+))|((255\.){2}(255|254|252|248|240|224|192|128|0+)\.0)|((255\.)(255|254|252|248|240|224|192|128|0+)(\.0+){2})|((255|254|252|248|240|224|192|128|0+)(\.0+){3}))";
 
@@ -111,7 +108,7 @@ public static class RegexHelper
 
     // Match an SNMP OID (like 1.3.6.1 or .1.3.6.2)
     public const string SnmpOidRegex = @"^\.?[012]\.(?:[0-9]|[1-3][0-9])(\.\d+)*$";
-    
+
     // Match a hosts file entry with optional comments, supporting IPv4, IPv6, and hostnames
     // ^*                                    : Matches the beginning of the line
     // (#)?                                  : Optionally matches a comment (#) at the start of the line

Source/NETworkManager.Utilities/RegexHelper.cs

@@ -0,0 +1,34 @@
+using NETworkManager.Localization.Resources;
+using NETworkManager.Utilities;
+using System.Diagnostics;
+using System.Globalization;
+using System.Text.RegularExpressions;
+using System.Windows.Controls;
+
+namespace NETworkManager.Validators;
+
+public class HostsFileEntryHostnameValidator : ValidationRule
+{
+    public override ValidationResult Validate(object value, CultureInfo cultureInfo)
+    {
+        var input = (value as string);
+
+        var isValid = true;
+
+        Debug.WriteLine(input);
+
+        foreach (var hostname in input.Split(' '))
+        {
+            if (Regex.IsMatch(hostname, RegexHelper.HostnameOrDomainRegex) == false)
+            {
+                isValid = false;
+                break;
+            }
+        }
+
+        if (isValid)
+            return ValidationResult.ValidResult;
+
+        return new ValidationResult(false, Strings.EnterValidHostsFileEntryHostname);
+    }
+}

Source/NETworkManager.Validators/HostsFileEntryHostnameValidator.cs

@@ -0,0 +1,19 @@
+using NETworkManager.Localization.Resources;
+using System.Globalization;
+using System.Net.Sockets;
+using System.Windows.Controls;
+
+namespace NETworkManager.Validators;
+
+public class IPAddressValidator : ValidationRule
+{
+    public override ValidationResult Validate(object value, CultureInfo cultureInfo)
+    {
+        var input = (value as string);
+
+        if (System.Net.IPAddress.TryParse(input, out var address) && (address.AddressFamily == AddressFamily.InterNetwork || address.AddressFamily == AddressFamily.InterNetworkV6))
+            return ValidationResult.ValidResult;
+
+        return new ValidationResult(false, Strings.EnterValidIPv6Address);
+    }
+}

Source/NETworkManager.Validators/IPAddressValidator.cs

@@ -1,22 +1,19 @@
-using System.Globalization;
-using System.Text.RegularExpressions;
+using NETworkManager.Localization.Resources;
+using System.Globalization;
+using System.Net.Sockets;
 using System.Windows.Controls;
-using NETworkManager.Localization.Resources;
-using NETworkManager.Utilities;
 
 namespace NETworkManager.Validators;
 
 public class IPv6AddressValidator : ValidationRule
 {
     public override ValidationResult Validate(object value, CultureInfo cultureInfo)
     {
-        var ipAddress = (value as string)?.Trim();
+        var input = (value as string);
 
-        if (string.IsNullOrEmpty(ipAddress))
-            return new ValidationResult(false, Strings.EnterValidIPv6Address);
+        if (System.Net.IPAddress.TryParse(input, out var address) && address.AddressFamily == AddressFamily.InterNetworkV6)
+            return ValidationResult.ValidResult;
 
-        return Regex.IsMatch(ipAddress, RegexHelper.IPv6AddressRegex)
-            ? ValidationResult.ValidResult
-            : new ValidationResult(false, Strings.EnterValidIPv6Address);
+        return new ValidationResult(false, Strings.EnterValidIPv6Address);
     }
 }