Remove old target frameworks (#10)

* Remove old target frameworks
* Add comments

Author: WojciechNagorski

docker/DockerFile

@@ -4,11 +4,14 @@ COPY --chown=root:root server/ssh /etc/ssh/
 COPY --chown=root:root server/script /opt/sshnet
 COPY --chown=sshnet:sshnet user/sshnet /home/sshnet/.ssh
 
-RUN apk add --no-cache syslog-ng && \
+RUN apk update && apk upgrade --no-cache && \
+    apk add --no-cache syslog-ng && \
     # install and configure sshd
     apk add --no-cache openssh && \
     # install openssh-server-pam to allow for keyboard-interactive authentication
     apk add --no-cache openssh-server-pam && \
+    # make sure scripts and keys have unix (LF) line endings
+    dos2unix /etc/ssh/* && \
     chmod 400 /etc/ssh/ssh*key && \
     sed -i 's/#PasswordAuthentication yes/PasswordAuthentication yes/' /etc/ssh/sshd_config && \
     sed -i 's/#LogLevel\s*INFO/LogLevel DEBUG3/' /etc/ssh/sshd_config && \
@@ -25,6 +28,7 @@ RUN apk add --no-cache syslog-ng && \
     adduser -D sshnet && \
     passwd -u sshnet && \
     echo 'sshnet:ssh4ever' | chpasswd && \
+    # make sure scripts and keys have unix (LF) line endings
     dos2unix /home/sshnet/.ssh/* && \
     chown -R sshnet:sshnet /home/sshnet && \
     chmod -R 700 /home/sshnet/.ssh && \
@@ -34,6 +38,7 @@ RUN apk add --no-cache syslog-ng && \
     passwd -u sshnetadm && \
     echo 'sshnetadm:ssh4ever' | chpasswd && \
     addgroup sshnetadm sudo && \
+    # make sure scripts and keys have unix (LF) line endings
     dos2unix /opt/sshnet/* && \
     # install shadow package; we use chage command in this package to expire/unexpire password of the sshnet user
     apk add --no-cache shadow && \

src/SshNetBenchmarks/SshNetBenchmarks.csproj

@@ -7,11 +7,12 @@
 
   <ItemGroup>
     <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
-    <PackageReference Include="SSH.NET" Version="2020.0.1" />
+    <PackageReference Include="SSH.NET" Version="2020.0.2" />
   </ItemGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\SshNetTests\SshNetTests.csproj" />
+    <!-- <ProjectReference Include="..\..\..\SSH.NET\src\Renci.SshNet\Renci.SshNet.csproj" /> -->
   </ItemGroup>
 
 </Project>

src/SshNetTests/Common/AsyncSocketListener.cs

@@ -87,9 +87,14 @@ private void AcceptCallback(IAsyncResult ar)
                 var state = new SocketStateObject(handler);
                 handler.BeginReceive(state.Buffer, 0, state.Buffer.Length, 0, ReadCallback, state);
             }
+            catch (SocketException)
+            {
+                // when the socket is closed, an SocketException is thrown since .NET 5
+                // by Socket.EndAccept(IAsyncResult)
+            }
             catch (ObjectDisposedException)
             {
-                // when the socket is closed, an ObjectDisposedException is thrown
+                // when the socket is closed, an ObjectDisposedException is thrown on old .NET Framework
                 // by Socket.EndAccept(IAsyncResult)
             }
         }

src/SshNetTests/SshNetTests.csproj

@@ -2,12 +2,12 @@
 
   <PropertyGroup>
     <OutputType>Library</OutputType>
-    <TargetFrameworks>net45;netcoreapp2.1;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net472;net7.0</TargetFrameworks>
     <AutoGenerateBindingRedirects>false</AutoGenerateBindingRedirects>
 	<IsTestProject>true</IsTestProject>
   </PropertyGroup>
 
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.1' or '$(TargetFramework)' == 'netcoreapp3.1' ">
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'net7.0' ">
     <DefineConstants>TRACE;FEATURE_MSTEST_DATATEST;FEATURE_SOCKET_EAP;FEATURE_ENCODING_ASCII;FEATURE_THREAD_SLEEP;FEATURE_THREAD_THREADPOOL</DefineConstants>
   </PropertyGroup>
 
@@ -28,16 +28,17 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />	  
     <PackageReference Include="MSTest.TestAdapter" Version="2.1.0" />
     <PackageReference Include="MSTest.TestFramework" Version="2.1.0" />
-    <PackageReference Include="SSH.NET" Version="2020.0.1" />
+    <PackageReference Include="SSH.NET" Version="2020.0.2" />
     <PackageReference Include="System.Management" Version="4.7.0" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net40' or '$(TargetFramework)' == 'net45' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
     <PackageReference Include="Tamir.SharpSSH" Version="1.1.1.13" />
   </ItemGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\..\..\SSH.NET-TestTools\src\SshNet.TestTools.OpenSSH\SshNet.TestTools.OpenSSH.csproj" />
+    <!-- <ProjectReference Include="..\..\..\SSH.NET\src\Renci.SshNet\Renci.SshNet.csproj" /> -->
   </ItemGroup>
 
   <ItemGroup>