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Update DnsQuery.cs

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This commit is contained in:
Namhyeon Go 2025-03-20 10:11:29 +09:00
parent 81d6e67f94
commit 6737b4885b
1 changed files with 64 additions and 2 deletions
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66
WelsonJS.Toolkit/WelsonJS.Launcher/Tools/DnsQuery.cs
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@ -3,6 +3,7 @@ using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Linq;
namespace WelsonJS.Launcher.Tools
{
@ -53,6 +54,21 @@ namespace WelsonJS.Launcher.Tools
{
List<string> records = new List<string>();
// Validate domain format
if (string.IsNullOrWhiteSpace(domain))
{
records.Add("Error: Domain cannot be empty");
return records;
}
// Basic domain format validation
if (domain.Length > 255 ||
!domain.Split('.').All(part => part.Length > 0 && part.Length <= 63))
{
records.Add("Error: Invalid domain format");
return records;
}
try
{
UdpClient udpClient = new UdpClient(_dnsServer, DnsPort);
@ -114,6 +130,24 @@ namespace WelsonJS.Launcher.Tools
{
List<string> results = new List<string>();
// Check response code from DNS server
int responseCode = response[3] & 0x0F;
if (responseCode != 0)
{
string errorMessage = "DNS server returned error: ";
switch (responseCode)
{
case 1: errorMessage += "Format Error"; break;
case 2: errorMessage += "Server Failure"; break;
case 3: errorMessage += "Name Error (Domain does not exist)"; break;
case 4: errorMessage += "Not Implemented"; break;
case 5: errorMessage += "Refused"; break;
default: errorMessage += $"Unknown Error ({responseCode})"; break;
}
results.Add(errorMessage);
return results;
}
int answerCount = (response[6] << 8) | response[7];
if (answerCount == 0)
{
@ -193,10 +227,38 @@ namespace WelsonJS.Launcher.Tools
results.Add($"SRV: Priority {prioritySrv}, Weight {weight}, Port {port}, Target {target}");
break;
case 35:
results.Add($"NAPTR: {BitConverter.ToString(data)}");
if (data.Length >= 7)
{
ushort order = (ushort)((data[0] << 8) | data[1]);
ushort preference = (ushort)((data[2] << 8) | data[3]);
// Extract flags, services, regexp and replacement
results.Add($"NAPTR: Order {order}, Preference {preference}");
}
else
{
results.Add($"NAPTR: Invalid data length: {BitConverter.ToString(data)}");
}
break;
case 257:
results.Add($"CAA: {BitConverter.ToString(data)}");
if (data.Length >= 2)
{
byte flags = data[0];
int tagLen = data[1];
if (data.Length >= 2 + tagLen)
{
string tag = Encoding.ASCII.GetString(data, 2, tagLen);
string value = Encoding.ASCII.GetString(data, 2 + tagLen, data.Length - 2 - tagLen);
results.Add($"CAA: Flags {flags}, Tag {tag}, Value {value}");
}
else
{
results.Add($"CAA: Invalid data length: {BitConverter.ToString(data)}");
}
}
else
{
results.Add($"CAA: Invalid data length: {BitConverter.ToString(data)}");
}
break;
default:
results.Add($"Unknown Type {recordType}: {BitConverter.ToString(data)}");