tyranid · multitudes · Oct 12, 2025
diff --git a/CANAPE.Cli.Lib/.DS_Store b/CANAPE.Cli.Lib/.DS_Store
diff --git a/CANAPE.Cli.Lib/CANAPE.Cli.Lib.csproj b/CANAPE.Cli.Lib/CANAPE.Cli.Lib.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <Authors>James Forshaw</Authors>
     <Description>Command Line Interface library for the CANAPE.Core network library.</Description>

diff --git a/CANAPE.Cli/CANAPE.Cli.csproj b/CANAPE.Cli/CANAPE.Cli.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>netcoreapp3.0; netcoreapp2.0; net471</TargetFrameworks>
+    <TargetFramework>net9.0</TargetFramework>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <Authors>James Forshaw</Authors>
     <Description>Command Line Interface CANAPE.Core network library.</Description>

diff --git a/CANAPE.Net.Protocols/.DS_Store b/CANAPE.Net.Protocols/.DS_Store
diff --git a/CANAPE.Net.Protocols/CANAPE.Net.Protocols.csproj b/CANAPE.Net.Protocols/CANAPE.Net.Protocols.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <Authors>James Forshaw</Authors>
     <Description>Network protocol parsing library for the CANAPE.Core network library.</Description>

diff --git a/CANAPE.Net.Templates/.DS_Store b/CANAPE.Net.Templates/.DS_Store
diff --git a/CANAPE.Net.Templates/CANAPE.Net.Templates.csproj b/CANAPE.Net.Templates/CANAPE.Net.Templates.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <Authors>James Forshaw</Authors>
     <Description>Network service template library for the CANAPE.Core network library.</Description>

diff --git a/CANAPE.Net/.DS_Store b/CANAPE.Net/.DS_Store
diff --git a/CANAPE.Net/CANAPE.Net.csproj b/CANAPE.Net/CANAPE.Net.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <Authors>James Forshaw</Authors>
     <Description>Core networking library for the CANAPE.Core network library.</Description>

diff --git a/CANAPE.Net/Listeners/TcpNetworkListener.cs b/CANAPE.Net/Listeners/TcpNetworkListener.cs
@@ -162,6 +162,11 @@ private async Task AcceptCallback(TcpListener listener)
                     // If client socket closed then exit loop.
                     break;
                 }
+                catch (InvalidOperationException)
+                {
+                    // In .NET 9.0+, TcpListener throws InvalidOperationException when stopped
+                    break;
+                }
                 catch (Exception ex)
                 {
                     _logger.LogException(ex);

diff --git a/CANAPE.Security/CANAPE.Security.csproj b/CANAPE.Security/CANAPE.Security.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <Authors>James Forshaw</Authors>
     <Description>Network security and certificate generator library for the CANAPE.Core network library.</Description>

diff --git a/CANAPE/.DS_Store b/CANAPE/.DS_Store
diff --git a/CANAPE/CANAPE.csproj b/CANAPE/CANAPE.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <Authors>James Forshaw</Authors>
     <Description>Base library for the CANAPE.Core network library.</Description>

diff --git a/NET9_MIGRATION.md b/NET9_MIGRATION.md
@@ -0,0 +1,69 @@
+# .NET 9.0 Migration Notes
+
+This document describes the changes made to migrate CANAPE.Core from .NET Standard 2.0/.NET Core 2.0/3.0 to .NET 9.0.
+
+## Project Files Updated
+
+All project files were updated to target .NET 9.0:
+
+1. **CANAPE.csproj** - Changed from `netstandard2.0` to `net9.0`
+2. **CANAPE.Net.csproj** - Changed from `netstandard2.0` to `net9.0`
+3. **CANAPE.Security.csproj** - Changed from `netstandard2.0` to `net9.0`
+4. **CANAPE.Net.Protocols.csproj** - Changed from `netstandard2.0` to `net9.0`
+5. **CANAPE.Net.Templates.csproj** - Changed from `netstandard2.0` to `net9.0`
+6. **CANAPE.Cli.csproj** - Changed from `netcoreapp3.0; netcoreapp2.0; net471` to `net9.0`
+7. **CANAPE.Cli.Lib.csproj** - Changed from `netstandard2.0` to `net9.0`
+
+## Code Changes Required
+
+### TcpNetworkListener.cs
+
+**Issue**: In .NET 9.0, `TcpListener.Stop()` behavior changed. When stopped, subsequent calls to `AcceptTcpClientAsync()` now throw `InvalidOperationException` instead of `ObjectDisposedException`.
+
+**Fix**: Added exception handling for `InvalidOperationException` in the `AcceptCallback` method:
+
+```csharp
+catch (InvalidOperationException)
+{
+    // In .NET 9.0+, TcpListener throws InvalidOperationException when stopped
+    break;
+}
+```
+
+**File**: `/CANAPE.Net/Listeners/TcpNetworkListener.cs`  
+**Line**: ~165 (in the `AcceptCallback` method)
+
+## Build and Run
+
+To build the solution:
+```bash
+dotnet build CANAPE.Core.sln -c Release
+```
+
+To run the CLI with the SOCKS proxy example:
+```bash
+cd CANAPE.Cli/bin/Release/net9.0
+dotnet exec CANAPE.Cli.dll /path/to/CANAPE.Cli.Lib/Examples/SocksProxy.csx --color
+```
+
+## Known Warnings
+
+The build produces several deprecation warnings that should be addressed in future updates:
+
+1. **SYSLIB0057**: X509Certificate2 constructor is obsolete - should use X509CertificateLoader
+2. **SYSLIB0039**: TLS 1.0/1.1 protocols are obsolete - should use newer TLS versions
+3. **SYSLIB0001**: UTF7Encoding is obsolete - should use UTF-8
+4. **NU5048**: PackageIconUrl is deprecated - should use PackageIcon
+
+These warnings don't prevent the code from working but should be addressed for better security and future compatibility.
+
+## Testing
+
+The migration was tested by:
+1. Building the entire solution successfully
+2. Running the SOCKS proxy example without errors
+3. Verifying the TCP listener starts and accepts connections properly
+
+## Date
+
+Migration completed: October 12, 2025
diff --git a/README.md b/README.md
@@ -1,14 +1,13 @@
 # CANAPE.Core - (c) James Forshaw 2017
 A network proxy library written in C# for .NET Core based on CANAPE. Licensed under GPLv3.
 
-It should work on any platform with .NET Standard support 2.0, so .NET Core 2.0.5 and .NET Framework 4.7.1 on Windows, Linux and
-macOS should be suitable as well as recompiling for .NET framework and Mono.
+This version has been updated to target .NET 9.0.
 
-To use either compile with Visual Studio 2017 with .NET Core support or from the command line do the 
-following (replace netcoreapp3.0 with netcoreapp2.0 if using 2.X framework):
+To use either compile with Visual Studio with .NET 9.0 SDK support or from the command line do the 
+following:
 
-```cd CANAPE.Core
-dotnet build CANAPE.Cli/CANAPE.Cli.csproj -c Release -f netcoreapp3.0
-cd CANAPE.Cli/bin/Release/netcoreapp3.0
+```
+dotnet build CANAPE.Cli/CANAPE.Cli.csproj -c Release
+cd CANAPE.Cli/bin/Release/net9.0
 dotnet exec CANAPE.Cli.dll Examples/SocksProxy.csx --color
 ```