Telnet 0.13.0
dotnet add package Telnet --version 0.13.0
NuGet\Install-Package Telnet -Version 0.13.0
<PackageReference Include="Telnet" Version="0.13.0" />
paket add Telnet --version 0.13.0
#r "nuget: Telnet, 0.13.0"
// Install Telnet as a Cake Addin #addin nuget:?package=Telnet&version=0.13.0 // Install Telnet as a Cake Tool #tool nuget:?package=Telnet&version=0.13.0
Telnet
We needed to issue simple commands to (and monitor) a router remotely and that's what we've been able to achieve with this little library. It's usage is simple, it doesn't do anything particularly fancy but if all you're wanting to do is interact with a telnet server by issuing commands, parsing text responses and having the opportunity to respond in code accordingly then hopefully having taken the time to wrap this up in a simple NuGet package will make your life easier!
FYI I'm happy to take merge requests if they meet incumbent standards, don't break anything and accomodate the code file sharing so all versions work (and likely receive the same change). I'm no TCPIP/Telnet expert but if I can help out with bugs or feature requests I'll do what I can, outside my day job ofc!
Release Notes
v0.9 introduced a significant bump to Net versions and some potentially breaking code changes. Changes to your consuming code should be minimal, but be prepared to test thoroughly. Please raise an Issue if you encounter any problems; in part it'll help others with the same problems and we'll see what we can do to accomodate your use cases.
v0.10 introduced an unintended dependency that's removed as of 0.11.2.
Most common functions in C# NuGet
Depending on which version of this library you use, you may or may not have access to asynchronous functionality. Wherever possible we would recommend using the async overloads.
- Client -
var client = new Client(\<ip string>, \<port#>, new CancellationToken()));
- Needed to setup the connection
- TryLogin -
bool result = await client.TryLoginAsync(\<username>, \<password>, \<Timout ms>, \<lineFeed default='\\n'>)
- Most Telnet connections are required to login; this function handles that and lets you know if it was successful. Please note it is just a wrapper for Read and Write calls to cover the most common scenario. If it doesn't work, roll your own TerminatedReads and Writes to service your specific UseCase.
- Try login uses a 'terminator' (the character after which you start writing commands) to detect if the login was successful (default is
>
). The terminator character is found after login and you can begin entering commands, for example,> configure
- '>' is the terminator.
If the terminator/linestarter is different to '>', you will need to specify it as a extra parameter.client.TryLoginAsync(\<username>, \<password>, \<Timout ms>, \<terminator>, \<lineFeed default='\\n'>)
- Try login uses a 'terminator' (the character after which you start writing commands) to detect if the login was successful (default is
- Most Telnet connections are required to login; this function handles that and lets you know if it was successful. Please note it is just a wrapper for Read and Write calls to cover the most common scenario. If it doesn't work, roll your own TerminatedReads and Writes to service your specific UseCase.
- TerminatedRead -
string s = await client.TerminatedReadAsync(\<value>, \<Timeout ms>)
- Will read until it sees the specified value (usually just use the terminator/
>
as the value to get started)
- Will read until it sees the specified value (usually just use the terminator/
- WriteLine -
await client.WriteLineAsync(\<value>, \<Timeout ms>
- Will write the value to the session
Debugging telnet connections
Wireshark is a good way to go about checking what is being sent back and forth - you can see the transmissions in plain text. Filter recording entries by 'telnet'.
Usage Examples:
.NET Fiddle https://dotnetfiddle.net/S9Ii6n
Asynchronous C#
namespace PrimS.Telnet.CiTests
{
using System;
using FluentAssertions;
using System.Threading;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
using Xunit;
public class ReadMeExampleFixture
{
public const string Pattern =
"(?:WAN2 total TX: )([0-9.]*) " +
"((?:[KMG]B)|(?:Bytes))" +
"(?:[, ]*RX: )([0-9.]*) " +
"((?:[KMG]B)|(?:Bytes))";
private const int TimeoutMs = 5000;
[Fact]
public async Task ReadMeExample()
{
using (var server = new DummyTelnetServer())
{
using (var client = new Client(
server.IPAddress.ToString(),
server.Port,
new CancellationToken()))
{
client.IsConnected.Should().Be(true);
Client.IsWriteConsole = false;
(await client.TryLoginAsync(
"username",
"password",
TimeoutMs)).Should().Be(true);
await client.WriteLineAsync("show statistic wan2");
string s = await client.TerminatedReadAsync(
">",
TimeSpan.FromMilliseconds(TimeoutMs));
s.Should().Contain(">");
s.Should().Contain("WAN2");
var regEx = new Regex(Pattern);
regEx.IsMatch(s).Should().Be(true);
MatchCollection matches = regEx.Matches(s);
matches.Count.Should().Be(1);
matches[0].Captures.Count.Should().Be(1);
matches[0].Groups.Count.Should().Be(5);
matches[0].Groups[0].Value.Should().Be(
"WAN2 total TX: 6.3 GB ,RX: 6.9 GB");
matches[0].Groups[1].Value.Should().Be("6.3");
matches[0].Groups[2].Value.Should().Be("GB");
matches[0].Groups[3].Value.Should().Be("6.9");
matches[0].Groups[4].Value.Should().Be("GB");
}
}
}
}
}
Synchronous C#
namespace PrimS.Telnet.CiTests
{
using FluentAssertions;
using Xunit;
using System;
using System.Text.RegularExpressions;
[TestClass]
public class ReadMeExampleFixture
{
public const string Pattern =
"(?:WAN2 total TX: )([0-9.]*) " +
"((?:[KMG]B)|(?:Bytes))" +
"(?:[, ]*RX: )([0-9.]*) " +
"((?:[KMG]B)|(?:Bytes))";
private const int TimeoutMs = 5000;
[Fact]
public void ReadMeExample()
{
using (var server = new DummyTelnetServer())
{
using (var client = new Client(
server.IPAddress.ToString(),
server.Port,
new CancellationToken()))
{
client.IsConnected.Should().Be(true);
Client.IsWriteConsole = false;
client.TryLogin(
"username",
"password",
TimeoutMs).Should().Be(true);
client.WriteLine("show statistic wan2");
string s = client.TerminatedRead(
">",
TimeSpan.FromMilliseconds(TimeoutMs));
s.Should().Contain(">");
s.Should().Contain("WAN2");
var regEx = new Regex(Pattern);
regEx.IsMatch(s).Should().Be(true);
MatchCollection matches = regEx.Matches(s);
matches.Count.Should().Be(1);
matches[0].Captures.Count.Should().Be(1);
matches[0].Groups.Count.Should().Be(5);
matches[0].Groups[0].Value.Should().Be(
"WAN2 total TX: 6.3 GB ,RX: 6.9 GB");
matches[0].Groups[1].Value.Should().Be("6.3");
matches[0].Groups[2].Value.Should().Be("GB");
matches[0].Groups[3].Value.Should().Be("6.9");
matches[0].Groups[4].Value.Should().Be("GB");
}
}
}
}
}
Visual Basic
Private Async Function RunRemoteScript(
commandLine As String) As Task(Of Boolean)
Using telnet = New Client(
"HostName",
23,
_cancellationSource.Token)
If Not telnet.IsConnected Then Return False
Dim loggedOn = Await telnet.TryLoginAsync(
"username",
"password",
SocketTimeout, "#"))
If Not loggedOn Then Return False
Await telnet.WriteLine(commandLine)
Dim serverResponse = Await telnet.TerminatedReadAsync(
"#",
TimeSpan.FromMilliseconds(SocketTimeout))
Debug.Print(serverResponse)
Await telnet.WriteLine("exit")
Dim logoutMessage = Await telnet.ReadAsync(
New TimeSpan(100))
Debug.Print(logoutMessage)
End Using
Return True ' If we got this far; celebrate
End Function
Product | Versions Compatible and additional computed target framework versions. |
---|---|
.NET | net5.0 was computed. net5.0-windows was computed. net6.0 is compatible. net6.0-android was computed. net6.0-ios was computed. net6.0-maccatalyst was computed. net6.0-macos was computed. net6.0-tvos was computed. net6.0-windows was computed. net7.0 was computed. net7.0-android was computed. net7.0-ios was computed. net7.0-maccatalyst was computed. net7.0-macos was computed. net7.0-tvos was computed. net7.0-windows was computed. net8.0 is compatible. net8.0-android was computed. net8.0-browser was computed. net8.0-ios was computed. net8.0-maccatalyst was computed. net8.0-macos was computed. net8.0-tvos was computed. net8.0-windows was computed. |
.NET Core | netcoreapp2.0 was computed. netcoreapp2.1 was computed. netcoreapp2.2 was computed. netcoreapp3.0 was computed. netcoreapp3.1 was computed. |
.NET Standard | netstandard2.0 is compatible. netstandard2.1 is compatible. |
.NET Framework | net461 was computed. net462 is compatible. net463 was computed. net47 was computed. net471 was computed. net472 is compatible. net48 is compatible. net481 was computed. |
MonoAndroid | monoandroid was computed. |
MonoMac | monomac was computed. |
MonoTouch | monotouch was computed. |
Tizen | tizen40 was computed. tizen60 was computed. |
Xamarin.iOS | xamarinios was computed. |
Xamarin.Mac | xamarinmac was computed. |
Xamarin.TVOS | xamarintvos was computed. |
Xamarin.WatchOS | xamarinwatchos was computed. |
-
.NETFramework 4.6.2
- No dependencies.
-
.NETFramework 4.7.2
- No dependencies.
-
.NETFramework 4.8
- No dependencies.
-
.NETStandard 2.0
- No dependencies.
-
.NETStandard 2.1
- No dependencies.
-
net6.0
- No dependencies.
-
net8.0
- No dependencies.
NuGet packages (4)
Showing the top 4 NuGet packages that depend on Telnet:
Package | Downloads |
---|---|
TeamSpeak3.Metrics
Collect metrics from your TeamSpeak 3 Server |
|
Rosystec.Scan.Lib
sensor aggregator |
|
DreamNucleus.Heos
A .Net HEOS CLI client using Reactive Extensions |
|
Simple.K.Socket
Package Description |
GitHub repositories (1)
Showing the top 1 popular GitHub repositories that depend on Telnet:
Repository | Stars |
---|---|
Kudayasu/Artifice
Xbox One Developer Mode Privilege Escalation
|
Version | Downloads | Last updated |
---|---|---|
0.13.0 | 12,096 | 7/8/2024 |
0.12.0 | 8,491 | 4/17/2024 |
0.11.3 | 156,282 | 9/17/2022 |
0.11.2 | 3,814 | 9/3/2022 |
0.11.1 | 1,511 | 9/2/2022 |
0.11.0 | 1,563 | 9/2/2022 |
0.10.2 | 2,822 | 8/22/2022 |
0.10.1 | 1,530 | 8/21/2022 |
0.10.0 | 1,218 | 8/20/2022 |
0.9.1 | 4,503 | 8/18/2022 |
0.9.0-beta0001 | 8,269 | 5/16/2018 |
0.8.6 | 264,923 | 9/3/2020 |
0.8.6-beta0001 | 409 | 9/2/2020 |
0.8.4 | 50,861 | 10/9/2019 |
0.8.3 | 25,321 | 3/7/2019 |
0.8.2 | 3,413 | 1/30/2019 |
0.8.1 | 134,240 | 5/8/2018 |
0.8.0 | 30,387 | 3/12/2017 |
0.7.0 | 10,751 | 9/6/2016 |
0.6.1 | 53,290 | 2/25/2016 |
0.6.0 | 1,567 | 1/27/2016 |
0.5.0 | 1,576 | 12/8/2015 |
0.4.0 | 3,695 | 10/27/2015 |
0.3.2 | 1,529 | 9/15/2015 |
0.3.1 | 2,461 | 6/20/2015 |
0.2.5 | 81,741 | 12/15/2014 |
0.2.0 | 1,322 | 11/27/2014 |
0.1.0 | 1,611 | 11/26/2014 |
0.13 extends the Client with a static flag SkipProactiveOptionNegotiation due to https://github.com/9swampy/Telnet/issues/79.