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BlockPage: Updated app to support showing blocking info on block page.

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This commit is contained in:
Shreyas Zare
2025-02-02 15:56:48 +05:30
parent 2f7a5d4494
commit b8113f6f7c
2 changed files with 69 additions and 8 deletions
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74
Apps/BlockPageApp/App.cs
View File

@@ -1,6 +1,6 @@
/*
Technitium DNS Server
Copyright (C) 2024 Shreyas Zare (shreyas@technitium.com)
Copyright (C) 2025 Shreyas Zare (shreyas@technitium.com)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -37,6 +37,9 @@ using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using TechnitiumLibrary;
using TechnitiumLibrary.Net.Dns;
using TechnitiumLibrary.Net.Dns.EDnsOptions;
using TechnitiumLibrary.Net.Dns.ResourceRecords;
namespace BlockPage
{
@@ -151,8 +154,9 @@ namespace BlockPage
string _webServerTlsCertificatePassword;
string _webServerRootPath;
bool _serveBlockPageFromWebServerRoot;
bool _includeBlockingInfo;
byte[] _blockPageContent;
string _blockPageContent;
WebApplication _webServer;
@@ -384,15 +388,70 @@ namespace BlockPage
private async Task ServeDefaultPageAsync(HttpContext context, RequestDelegate next)
{
string blockPageContent = _blockPageContent;
if (_includeBlockingInfo)
{
string blockingInfoHtmlContent = null;
try
{
string host = context.Request.Host.Host;
if (host is not null)
{
DnsDatagram dnsRequest = new DnsDatagram(0, false, DnsOpcode.StandardQuery, false, false, true, false, false, false, DnsResponseCode.NoError, [new DnsQuestionRecord(host, DnsResourceRecordType.A, DnsClass.IN)], udpPayloadSize: DnsDatagram.EDNS_DEFAULT_UDP_PAYLOAD_SIZE);
DnsDatagram dnsResponse = await _dnsServer.DirectQueryAsync(dnsRequest, 500);
List<EDnsExtendedDnsErrorOptionData> options = new List<EDnsExtendedDnsErrorOptionData>();
if (dnsResponse.EDNS is not null)
{
foreach (EDnsOption option in dnsResponse.EDNS.Options)
{
if (option.Code == EDnsOptionCode.EXTENDED_DNS_ERROR)
{
EDnsExtendedDnsErrorOptionData ede = option.Data as EDnsExtendedDnsErrorOptionData;
options.Add(ede);
}
}
}
options.AddRange(dnsResponse.DnsClientExtendedErrors);
foreach (EDnsExtendedDnsErrorOptionData option in options)
{
if (blockingInfoHtmlContent is null)
blockingInfoHtmlContent = " <p><b>Detailed Info</b><br>" + option.InfoCode.ToString() + (option.ExtraText is null ? "" : ": " + option.ExtraText);
else
blockingInfoHtmlContent += "<br>" + option.InfoCode.ToString() + (option.ExtraText is null ? "" : ": " + option.ExtraText);
}
if (blockingInfoHtmlContent is not null)
blockingInfoHtmlContent += "</p>";
}
}
catch (Exception ex)
{
_dnsServer.WriteLog(ex);
}
if (blockingInfoHtmlContent is null)
blockPageContent = blockPageContent.Replace("{BLOCKING-INFO}", "");
else
blockPageContent = blockPageContent.Replace("{BLOCKING-INFO}", blockingInfoHtmlContent);
}
byte[] finalBlockPageContent = Encoding.UTF8.GetBytes(blockPageContent);
HttpResponse response = context.Response;
response.StatusCode = StatusCodes.Status200OK;
response.ContentType = "text/html; charset=utf-8";
response.ContentLength = _blockPageContent.Length;
response.ContentLength = finalBlockPageContent.Length;
using (Stream s = context.Response.Body)
{
await s.WriteAsync(_blockPageContent);
await s.WriteAsync(finalBlockPageContent);
}
}
@@ -430,18 +489,19 @@ namespace BlockPage
string blockPageHeading = jsonWebServerConfig.GetProperty("blockPageHeading").GetString();
string blockPageMessage = jsonWebServerConfig.GetProperty("blockPageMessage").GetString();
string blockPageContent = @"<html>
_includeBlockingInfo = jsonWebServerConfig.GetPropertyValue("includeBlockingInfo", true);
_blockPageContent = @"<html>
<head>
<title>" + (blockPageTitle is null ? "" : blockPageTitle) + @"</title>
</head>
<body>
" + (blockPageHeading is null ? "" : " <h1>" + blockPageHeading + "</h1>") + @"
" + (blockPageMessage is null ? "" : " <p>" + blockPageMessage + "</p>") + @"
" + (_includeBlockingInfo ? "{BLOCKING-INFO}" : "") + @"
</body>
</html>";
_blockPageContent = Encoding.UTF8.GetBytes(blockPageContent);
try
{
await StopWebServerAsync();

3
Apps/BlockPageApp/dnsApp.config
View File

@@ -13,6 +13,7 @@
"serveBlockPageFromWebServerRoot": false,
"blockPageTitle": "Website Blocked",
"blockPageHeading": "Website Blocked",
"blockPageMessage": "This website has been blocked by your network administrator."
"blockPageMessage": "This website has been blocked by your network administrator.",
"includeBlockingInfo": true
}
]