Support picking if ipv6 or ipv4 should be used

ISPChk/Controllers/HostController.cs

@@ -6,6 +6,7 @@ using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using ISPChk.Models;
+using System.Net;
 
 namespace ISPChk.Controllers
 {
@@ -100,6 +101,23 @@ namespace ISPChk.Controllers
         [HttpPost]
         public async Task<ActionResult<Host>> PostHost(Host host)
         {
+            IPAddress ipAddr;
+            if (!IPAddress.TryParse(host.HostName, out ipAddr))
+            {
+                try {
+                    IPHostEntry hostInfo = Dns.GetHostEntry(host.HostName);
+                } catch(System.Net.Sockets.SocketException e)
+                {
+                    return BadRequest(new { errmsg = "Could not resolve hostname." });
+                }
+            } else
+            {
+                if(ipAddr.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork && host.IPv6 == true ||
+                    ipAddr.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6 && host.IPv6 == false)
+                {
+                    return BadRequest(new { errmsg = "Given IP was not of correct family." });
+                }
+            }
             _context.Hosts.Add(host);
             await _context.SaveChangesAsync();
 

ISPChk/Models/Host.cs

@@ -10,6 +10,7 @@ namespace ISPChk.Models
         public long HostId { get; set; }
         public string Name { get; set; }
         public string HostName { get; set; }
+        public bool IPv6 { get; set; }
         public bool Ping { get; set; }
         public bool TCP { get; set; }
 

ISPChk/NetworkTest.cs

@@ -3,6 +3,7 @@ using Microsoft.EntityFrameworkCore;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using System.Net.NetworkInformation;
 using System.Text;
 using System.Threading;
@@ -13,9 +14,11 @@ namespace ISPChk
     public class NetworkTest : INetworkTest
     {
         private ISPChkContext _context;
+        private List<Task> runningTasks;
 
         public NetworkTest() {
             _context = CreateDbContext();
+            System.Diagnostics.Debug.WriteLine("NetworkTest instantiated.");
         }
 
         public async void LoadHostsFromDatabase()
@@ -32,7 +35,7 @@ namespace ISPChk
             var optionsBuilder = new DbContextOptionsBuilder<ISPChkContext>();
             optionsBuilder.UseSqlite("Data Source=ispchk.db");
             var ctx = new ISPChkContext(optionsBuilder.Options);
-            System.Diagnostics.Debug.WriteLine("NetworkTest instantiated.");
+            System.Diagnostics.Debug.WriteLine("DbContext created.");
             ctx.Database.EnsureCreated();
             return ctx;
         }
@@ -46,6 +49,30 @@ namespace ISPChk
                 var h = await ctx.Hosts.FindAsync(host.HostId);
                 ctx.Entry(h).Collection(hst => hst.PingItems).Load();
 
+                IPAddress pingAddress;
+
+
+                if (!IPAddress.TryParse(h.HostName, out pingAddress))
+                {
+                    System.Diagnostics.Debug.WriteLine("Resolving "+h.HostName);
+                    IPHostEntry hostInfo = Dns.GetHostEntry(h.HostName);
+                    foreach(var a in hostInfo.AddressList)
+                    {
+                        if((a.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6 && h.IPv6 == true) ||
+                            a.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork && h.IPv6 == false)
+                        {
+                            pingAddress = a;
+                            break;
+                        }
+                    }
+                }
+
+                if(pingAddress == null)
+                {
+                    System.Diagnostics.Debug.WriteLine("No address to ping found...");
+                    return;
+                }
+
                 Ping pingSender = new Ping();
 
                 // Create a buffer of 32 bytes of data to be transmitted.
@@ -61,7 +88,7 @@ namespace ISPChk
                 // cannot be fragmented.
                 PingOptions options = new PingOptions(64, true);
 
-                System.Diagnostics.Debug.WriteLine("Pinging " + host.Name);
+                System.Diagnostics.Debug.WriteLine("Initiate ping to " + pingAddress);
 
                 while (true)
                 {
@@ -73,8 +100,9 @@ namespace ISPChk
                     int failures = 0;
                     for (var i = 0; i < numPings; ++i)
                     {
+                        try {
                             // Send the request.
-                        PingReply reply = pingSender.Send(host.HostName, timeout, buffer, options);
+                            PingReply reply = pingSender.Send(pingAddress, timeout, buffer, options);
 
                             if (reply.Status == IPStatus.Success)
                             {
@@ -99,6 +127,10 @@ namespace ISPChk
                                 System.Diagnostics.Debug.WriteLine(reply.Status);
                                 failures++;
                             }
+                        } catch(Exception e) {
+                            System.Diagnostics.Debug.WriteLine("Found exception while pinging"+e);
+                            failures++;
+                        }
                         Thread.Sleep(500);
                     }
                     if(successes > 0)

ISPChk/wwwroot/index.html

@@ -22,6 +22,11 @@
                         <label for="inpHostNameAdd" class="form-label">Hostname</label>
                         <input type="text" class="form-control" id="inpHostNameAdd">
                     </div>
+                    <div class="form-check">
+                        <input type="checkbox" class="form-check-input" id="chkIPv6">
+                        <label class="form-check-label" for="chkIPv6">IPv6?</label>
+                    </div>
+                    <hr />
                     <div class="form-check">
                         <input type="checkbox" class="form-check-input" id="chkPing">
                         <label class="form-check-label" for="chkPing">Ping</label>
@@ -55,7 +60,7 @@
                 <form id="frmHistory">
                     <div>
                         <label for="inpHistoryPast" class="form-label">Show past x minutes</label>
-                        <input type="text" class="form-control" id="inpHistoryPast" aria-describedby="inpNameAddHelp" value="1440">
+                        <input type="text" class="form-control" id="inpHistoryPast" aria-describedby="inpNameAddHelp" value="60">
                     </div>
                     <button type="submit" class="btn btn-primary">Show me</button>
                 </form>

ISPChk/wwwroot/ispchk.js

@@ -222,11 +222,13 @@ $("#frmHostAdd").submit((event) => {
     event.preventDefault();
     var name = $("#inpNameAdd").val();
     var hostname = $("#inpHostNameAdd").val();
-    var ping = $('#chkPing').prop('checked')
-    var tcp = $('#chkPing').prop('checked')
+    var ipv6 = $('#chkIPv6').prop('checked');
+    var ping = $('#chkPing').prop('checked');
+    var tcp = $('#chkPing').prop('checked');
     var host = {
         name: name,
         hostname: hostname,
+        ipv6: ipv6,
         ping: ping,
         tcp: tcp
     }