I would like to run a set of commands that would typically be run in telnet(from c#).
For example I would like to run the following
using System;
using System.Diagnostics;
namespace InteractWithConsoleApp
{
class Program
{
static void Main(string[] args)
{
ProcessStartInfo cmdStartInfo = new ProcessStartInfo();
cmdStartInfo.FileName = @"C:\Windows\System32\cmd.exe";
cmdStartInfo.RedirectStandardOutput = true;
cmdStartInfo.RedirectStandardError = true;
cmdStartInfo.RedirectStandardInput = true;
cmdStartInfo.UseShellExecute = false;
cmdStartInfo.CreateNoWindow = true;
Process cmdProcess = new Process();
cmdProcess.StartInfo = cmdStartInfo;
cmdProcess.ErrorDataReceived += cmd_Error;
cmdProcess.OutputDataReceived += cmd_DataReceived;
cmdProcess.EnableRaisingEvents = true;
cmdProcess.Start();
cmdProcess.BeginOutputReadLine();
cmdProcess.BeginErrorReadLine();
cmdProcess.StandardInput.WriteLine("telnet telehack.com");
int milliseconds = 2000;
System.Threading.Thread.Sleep(milliseconds);
cmdProcess.StandardInput.WriteLine("exit");
cmdProcess.StandardInput.WriteLine("exit");
cmdProcess.WaitForExit();
}
static void cmd_DataReceived(object sender, DataReceivedEventArgs e)
{
Console.WriteLine(e.Data);
}
static void cmd_Error(object sender, DataReceivedEventArgs e)
{
Console.WriteLine(e.Data);
}
}
}
and keep telnet open to run subsequent commands. For example for the question above I would like to run and receive the following output, but I don't receive any of the telnet output. It doesn't receive any output. This is related.
telnet telehack.com
> Connected to TELEHACK port 53
It is 2:33 pm on Tuesday, September 1, 2015 in Mountain View, California, USA.
There are 31 local users. There are 24906 hosts on the network.
May the command line live forever.
Command, one of the following:
? ac advent basic cal calc
ching clear clock cowsay date echo
eliza factor figlet finger fnord geoip
help hosts ipaddr joke login md5
morse newuser notes octopus phoon pig
ping primes privacy rain rand rfc
rig roll rot13 sleep starwars traceroute
units uptime usenet users uumap uupath
uuplot weather when zc zork zrun
.calc
calc>2+2
> 4
答案 0 :(得分：8)
根据评论我明白你可以使用实际的telnet协议实现而不是调用telnet.exe，所以
Form1.cs的
using MinimalisticTelnet;
using System;
using System.Text.RegularExpressions;
using System.Windows.Forms;
namespace Telnet
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private MinimalisticTelnet.TelnetConnection _tc;
private void Form1_Load(object sender, EventArgs e)
{
_tc = new TelnetConnection("telehack.com", 23);
}
private void timer1_Tick(object sender, EventArgs e)
{
ProcessOutput();
}
private void btnSendCommand_Click(object sender, EventArgs e)
{
if (_tc.IsConnected)
{
_tc.WriteLine(tbCommand.Text.Trim());
tbCommand.Clear();
tbCommand.Focus();
ProcessOutput();
}
}
private void ProcessOutput()
{
if (!_tc.IsConnected)
return;
var s = _tc.Read();
s = Regex.Replace(s, @"\x1b\[([0-9,A-Z]{1,2}(;[0-9]{1,2})?(;[0-9]{3})?)?[m|K]?", "");
tbOutput.AppendText(s);
}
}
}
TelnetInterface.cs
// minimalistic telnet implementation
// conceived by Tom Janssens on 2007/06/06 for codeproject
//
// http://www.corebvba.be
using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
namespace MinimalisticTelnet
{
enum Verbs
{
WILL = 251,
WONT = 252,
DO = 253,
DONT = 254,
IAC = 255
}
enum Options
{
SGA = 3
}
class TelnetConnection
{
TcpClient tcpSocket;
int TimeOutMs = 100;
public TelnetConnection(string Hostname, int Port)
{
tcpSocket = new TcpClient(Hostname, Port);
}
public string Login(string Username, string Password, int LoginTimeOutMs)
{
int oldTimeOutMs = TimeOutMs;
TimeOutMs = LoginTimeOutMs;
string s = Read();
if (!s.TrimEnd().EndsWith(":"))
throw new Exception("Failed to connect : no login prompt");
WriteLine(Username);
s += Read();
if (!s.TrimEnd().EndsWith(":"))
throw new Exception("Failed to connect : no password prompt");
WriteLine(Password);
s += Read();
TimeOutMs = oldTimeOutMs;
return s;
}
public void WriteLine(string cmd)
{
Write(cmd + Environment.NewLine);
}
public void Write(string cmd)
{
if (!tcpSocket.Connected) return;
byte[] buf = System.Text.ASCIIEncoding.ASCII.GetBytes(cmd.Replace("\0xFF", "\0xFF\0xFF"));
tcpSocket.GetStream().Write(buf, 0, buf.Length);
}
public string Read()
{
if (!tcpSocket.Connected) return null;
StringBuilder sb = new StringBuilder();
do
{
ParseTelnet(sb);
System.Threading.Thread.Sleep(TimeOutMs);
} while (tcpSocket.Available > 0);
return sb.ToString();
}
public bool IsConnected
{
get { return tcpSocket.Connected; }
}
void ParseTelnet(StringBuilder sb)
{
while (tcpSocket.Available > 0)
{
int input = tcpSocket.GetStream().ReadByte();
switch (input)
{
case -1:
break;
case (int)Verbs.IAC:
// interpret as command
int inputverb = tcpSocket.GetStream().ReadByte();
if (inputverb == -1) break;
switch (inputverb)
{
case (int)Verbs.IAC:
//literal IAC = 255 escaped, so append char 255 to string
sb.Append(inputverb);
break;
case (int)Verbs.DO:
case (int)Verbs.DONT:
case (int)Verbs.WILL:
case (int)Verbs.WONT:
// reply to all commands with "WONT", unless it is SGA (suppres go ahead)
int inputoption = tcpSocket.GetStream().ReadByte();
if (inputoption == -1) break;
tcpSocket.GetStream().WriteByte((byte)Verbs.IAC);
if (inputoption == (int)Options.SGA)
tcpSocket.GetStream().WriteByte(inputverb == (int)Verbs.DO ? (byte)Verbs.WILL : (byte)Verbs.DO);
else
tcpSocket.GetStream().WriteByte(inputverb == (int)Verbs.DO ? (byte)Verbs.WONT : (byte)Verbs.DONT);
tcpSocket.GetStream().WriteByte((byte)inputoption);
break;
default:
break;
}
break;
default:
sb.Append((char)input);
break;
}
}
}
}
}
这是Windows Forms应用程序，包含2个文本框和1个按钮以及一个计时器（间隔为1000毫秒）。 我使用了CodeProject中的代码（在原始问题中链接）和一些更改，以使其实际工作。
答案 1 :(得分：4)
Coding this may be hard. However, there are free tools out there for Telnet scripting, see Expect for one. If you have an C# application then perhaps your code could generate the Expect script and then run Expect?
答案 2 :(得分：1)
向 telnet 发送信息似乎应该是直截了当的;使用SendKeys()。问题变成了如何捕获输出。
我发现这个YouTube视频应该有所帮助：https://www.youtube.com/watch?v=BDTCviA-5M8
视频中的解决方案并未真正解决保持会话开放的问题。我在这里有点不在我的知识领域，但我相信你可以在工作线程中启动 telnet ，用ImageView向它发送命令，按照视频中的描述捕获输出，然后解析它。
这是否足以解决要求？