Added Resolve-DnsName cmdlet

Added extra overload for StringArgument to simplify calling

Author: bitsadmin

README.md

@@ -89,7 +89,6 @@ Authors of additional NoPowerShell cmdlets are added to the table below. Moreove
 
 | Cmdlet | Contributed by | GitHub | Twitter |
 | - | - | - | - |
-| Resolve-DnsName |  |  |  |
 | Get-ADUser |  |  |  |
 | Get-ADGroupMember |  |  |  |
 
@@ -116,5 +115,6 @@ Authors of additional NoPowerShell cmdlets are added to the table below. Moreove
 | Format-Table | Utility | |
 | Invoke-WebRequest | Utility |
 | Select-Object | Utility |
+| Resolve-DnsName | DnsClient | Very basic implementation, support for specifying DNS server and query type need to be added |
 
 **Authored by Arris Huijgen (@_bitsadmin - https://github.com/bitsadmin)**

Source/NoPowerShell/Arguments/StringArgument.cs

@@ -34,6 +34,15 @@ public StringArgument(string argumentName, string defaultValue, bool optionalArg
             this._isOptionalArgument = optionalArgument;
         }
 
+        /// <summary>
+        /// Create a new string argument with a null default value specifying whether it is optional or not.
+        /// </summary>
+        /// <param name="argumentName">Name of the parameter</param>
+        /// <param name="optionalArgument">True if the argument is optional; False if not</param>
+        public StringArgument(string argumentName, bool optionalArgument) : this(argumentName, null, optionalArgument)
+        {
+        }
+
         /// <summary>
         /// Create a new string argument with a null default value.
         /// </summary>

Source/NoPowerShell/Commands/DnsClient/ResolveDnsNameCommand.cs

@@ -0,0 +1,74 @@
+using NoPowerShell.Arguments;
+using NoPowerShell.HelperClasses;
+using System.Net;
+
+/*
+Author: @_bitsadmin
+Website: https://github.com/bitsadmin
+License: BSD 3-Clause
+*/
+
+namespace NoPowerShell.Commands
+{
+    public class ResolveDnsNameCommand : PSCommand
+    {
+        public ResolveDnsNameCommand(string[] userArguments) : base(userArguments, SupportedArguments)
+        {
+        }
+
+        public override CommandResult Execute(CommandResult pipeIn)
+        {
+            // Obtain cmdlet parameters
+            string query = _arguments.Get<StringArgument>("Name").Value;
+            //string queryType = _arguments.Get<StringArgument>("Type").Value;
+            //string server = _arguments.Get<StringArgument>("Server").Value;
+
+            // Resolve and store results
+            IPHostEntry response = Dns.GetHostEntry(query);
+
+            foreach(IPAddress ip in response.AddressList)
+            {
+                _results.Add(
+                    new ResultRecord()
+                    {
+                        { "Name", response.HostName },
+                        { "IPAddress", ip.ToString() }
+                    }
+                );
+            }
+            
+            return _results;
+        }
+
+        public static new CaseInsensitiveList Aliases
+        {
+            get
+            {
+                return new CaseInsensitiveList()
+                {
+                    "Resolve-DnsName",
+                    "nslookup", "host" // Not official
+                };
+            }
+        }
+
+        public static new ArgumentList SupportedArguments
+        {
+            get
+            {
+                return new ArgumentList()
+                {
+                    new StringArgument("Name")
+                    // TODO:
+                    //new StringArgument("Type", true),
+                    //new StringArgument("Server", true),
+                };
+            }
+        }
+
+        public static new string Synopsis
+        {
+            get { return "This template shows how easy it is to develop new NoPowerShell cmdlets."; }
+        }
+    }
+}

Source/NoPowerShell/Commands/Management/GetWmiObjectCommand.cs

@@ -51,8 +51,8 @@ public override CommandResult Execute(CommandResult pipeIn)
                 {
                     new StringArgument("Namespace", @"root\cimv2", true),
                     new StringArgument("Query"),
-                    new StringArgument("Class", null, true),
-                    new StringArgument("Filter", null, true)
+                    new StringArgument("Class", true),
+                    new StringArgument("Filter", true)
                 };
             }
         }

Source/NoPowerShell/Commands/PSCommand.cs

@@ -33,8 +33,8 @@ public PSCommand(string[] userArguments, ArgumentList supportedArguments)
             supportedArguments.AddRange(new List<Argument>()
             {
                 new StringArgument("ComputerName", ".", true),
-                new StringArgument("Username", null, true),
-                new StringArgument("Password", null, true)
+                new StringArgument("Username", true),
+                new StringArgument("Password", true)
             });
 
             _arguments = ParseArguments(userArguments, supportedArguments);

Source/NoPowerShell/Commands/Utility/InvokeWebRequestCommand.cs

@@ -55,8 +55,8 @@ public override CommandResult Execute(CommandResult pipeIn)
             {
                 return new ArgumentList()
                 {
-                    new StringArgument("URI", null),
-                    new StringArgument("OutFile", null, true)
+                    new StringArgument("URI"),
+                    new StringArgument("OutFile", true)
                 };
             }
         }

Source/NoPowerShell/Commands/Utility/SelectObjectCommand.cs

@@ -48,7 +48,7 @@ public override CommandResult Execute(CommandResult pipeIn)
             {
                 return new ArgumentList()
                 {
-                    new StringArgument("Property", null)
+                    new StringArgument("Property")
                 };
             }
         }

Source/NoPowerShell/NoPowerShell.csproj

@@ -46,6 +46,7 @@
     <Compile Include="Arguments\StringArgument.cs" />
     <Compile Include="Commands\Additional\GetSystemInfoCommand.cs" />
     <Compile Include="Commands\Core\GetCommandCommand.cs" />
+    <Compile Include="Commands\DnsClient\ResolveDnsNameCommand.cs" />
     <Compile Include="Commands\Management\GetItemPropertyCommand.cs" />
     <Compile Include="Commands\Management\RemoveItemCommand.cs" />
     <Compile Include="Commands\Management\InvokeWmiMethodCommand.cs" />