Cisco Telnet C-Sharp

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Class HOTelnet.cs

using System;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Collections.Generic;
using System.Text.RegularExpressions;
 
namespace Telnet
{
    public class TelnetConnection : IDisposable
    {
        public string hostname;
        private TcpClient tcpSocket;
        private int TimeoutMs = 100;
 
 
 
        public bool IsConnected
        {
            get
            {
                try {
                    return tcpSocket.Connected;
                }
                catch
                {
                    return false;
                }
            }
        }
 
 
        public TelnetConnection(string hostname, int port)
        {
            try
            {
                tcpSocket = new TcpClient(hostname, port);
            }
            catch
            {
 
            }
        }
 
        ~TelnetConnection()
        {
            Dispose(false);
        }
        public string CiscoLogin(string username, string password)
        {
            string s = ReadUntil("Username:");
            WriteLine(username);
            s = ReadUntil("Password:");
            WriteLine(password);
            s = ReadUntil("[>|#]");
 
            string[] s2 = s.Split('\r', '\n');
            s = s2[s2.Length - 1];
            Match match = Regex.Match(s, @"(.*)[>|#]$");
            if (match.Success)
            {
                hostname = match.Groups[1].Value;
            }
            else
            {
                Console.WriteLine("ERROR: User prompt not returned as expected - Is it a Cisco router?");
            }
            WriteLine("terminal length 0"); // Disable multipage outputs
            s = ReadUntil(hostname + "#");
            return s;
        }
        public string CiscoLogin(string password)
        {
            string s = ReadUntil("Password:");
            WriteLine(password);
            s = ReadUntil(">");
 
            string[] s2 = s.Split('\r', '\n');
            s = s2[s2.Length - 1];
            Match match = Regex.Match(s, @"(.*)>$");
            if (match.Success)
            {
                hostname = match.Groups[1].Value;
            }
            else
            {
                Console.WriteLine("ERROR: User prompt not returned as expected - Is it a Cisco router?");
            }
            return s;
        }
        public void CiscoEnable(string password)
        {
            WriteLine("enable");
            Console.WriteLine("Sent enable");
            string s = ReadUntil("Password:");
            WriteLine(password);
            s = ReadUntil(hostname + "#");
            WriteLine("terminal length 0"); // Disable multipage outputs
            s = ReadUntil(hostname + "#");
        }
 
 
        public List<String> CiscoCommand(string Command)
        {
            String Result;
 
            List<String> ResultList = new List<String>();
            WriteLine(Command);
            Result = ReadUntil("(" + hostname + "#|" + hostname + "\\(config.*\\)#)");
            String[] ResultArray = Result.Split('\r');
            //Remove newline and replace tabs with space
            for (int i = 0; i < ResultArray.Length; i++)
            {
                ResultArray[i] = Regex.Replace(ResultArray[i], @"\n|\r", "");    // Remove \r and \n
                ResultArray[i] = Regex.Replace(ResultArray[i], @"\t+", " ");        // Replace one or more tabs with one space
                ResultList.Add(ResultArray[i]);
            }
            return ResultList;
        }
 
        public void WriteLine(string cmd)
        {
            Write(cmd + "\n");
        }
 
        public void Write(string cmd)
        {
 
                if (!tcpSocket.Connected)
                {
                    return;
                }
 
 
 
                byte[] buf = ASCIIEncoding.ASCII.GetBytes(cmd.Replace("\0xFF", "\0xFF\0xFF"));
                tcpSocket.GetStream().Write(buf, 0, buf.Length);
        }
 
 
 
        public string ReadUntil(string Delimiter)
        {
            var sb = new StringBuilder();
            string s;
 
            do
            {
                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;
                        }
 
                        break;
 
                    default:
 
                        sb.Append((char)input);
                        break;
                }
                s = sb.ToString();
 
            } while (!Regex.IsMatch(s, Delimiter + "$"));
            //} while ( !s.EndsWith(Delimiter)) ;
 
            return (s);
        }
 
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
 
        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (tcpSocket != null)
                {
                    ((IDisposable)tcpSocket).Dispose();
                    tcpSocket = null;
                }
            }
        }
 
 
        #region Private Enums
 
        enum Verbs
        {
            Will = 251,
            Wont = 252,
            Do = 253,
            Dont = 254,
            Iac = 255
        }
 
        enum Options
        {
            Sga = 3
        }
 
        #endregion
    }
}

Eksempel på anvendelse

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;
 
namespace Telnet
{
    public partial class Default : System.Web.UI.Page
    {
 
        Dictionary<String, String> CiscoDevice = new Dictionary<String, String>();
        public static List<string> mylist = new List<string>();
        public static List<String> Result = new List<String>();
        public static HOTelnet.TelnetConnection T1;
        public static string IP;
 
        protected void Page_Load(object sender, EventArgs e)
        {
        }
 
        //Connect knap
        protected void button1_Click(object sender, EventArgs e)
        {
            //Giver fejl hvis IP ikke er udfyldt
            if (string.IsNullOrWhiteSpace(TextBox1.Text))
            {
                //Giver fejl hvis Password ikke er udfyldt
                if (string.IsNullOrWhiteSpace(TextBox2.Text))
                {
                    Label4.Text = "Please enter password";
                }
                Label2.Text = "Please enter an IP adress";
            }
 
            //Giver fejl hvis Password ikke er udfyldt
            else if (string.IsNullOrWhiteSpace(TextBox2.Text))
            {
                Label4.Text = "Please enter password";
                Label2.Text = "";
            }
 
            //Hvis begge ting er udfyldt prøver vi at kontakte switchen eller routeren og få adgang via telnet
            else if ((!(string.IsNullOrWhiteSpace(TextBox1.Text))) && (!(string.IsNullOrWhiteSpace(TextBox2.Text))))
            {
                IP = TextBox1.Text;
                CiscoDevice.Add("IP", IP);
                T1 = new Cisco_Configuration_1.TelnetConnection(CiscoDevice["IP"], 23);
                Label2.Text = "";
                //Hvis det lykkedes at få forbindelse
                if (T1.IsConnected == true)
                {
                    string s = T1.CiscoLogin(TextBox2.Text);
                    TextBox1.Text = "";
                    TextBox2.Text = "";
                    T1.CiscoEnable("cisco");
                    //skifter til ChooseMenu.aspx
                    Server.Transfer("ChooseMenu.aspx", true);
                }
 
                //Giver fejl hvis det ikke lykkedes at kontakte IPén
                else if (T1.IsConnected == false)
                {
                    Label2.Text = "Wrong IP, try again";
                    TextBox1.Text = "";
                    TextBox2.Text = "";
                }
            }
        }
 
        //Switch config
        public void SWConf ()
        {
            T1.CiscoCommand("configure terminal");
            T1.CiscoCommand("line vty 0 4");
            T1.CiscoCommand("password cisco");
            T1.CiscoCommand("exit");
            T1.CiscoCommand("enable secret cisco");
            T1.CiscoCommand("banner motd !2502!");
            T1.CiscoCommand("interface vlan1");
            T1.CiscoCommand("ip address 192.168.138.220 255.255.255.0");
            T1.CiscoCommand("exit");
            T1.CiscoCommand("interface fa0/1");
            T1.CiscoCommand("switchport mode trunk");
            T1.CiscoCommand("exit");
            T1.CiscoCommand("interface range fa0/20 - 24");
            T1.CiscoCommand("switchport mode access");
            T1.CiscoCommand("switchport access vlan 5");
            T1.CiscoCommand("exit");
            T1.CiscoCommand("exit");
        }
 
        //Router config
        public void RouterConf()
        {
            T1.CiscoCommand("configure terminal");
            T1.CiscoCommand("line vty 0 4");
            T1.CiscoCommand("password cisco");
            T1.CiscoCommand("exit");
            T1.CiscoCommand("enable secret cisco");
            T1.CiscoCommand("banner motd !authorized access only!");
            T1.CiscoCommand("Interface fa0/1");
            T1.CiscoCommand("ip address 192.168.138.230 255.255.255.0");
            T1.CiscoCommand("no shutdown");
            T1.CiscoCommand("exit");
            T1.CiscoCommand("interface fa0/1.10");
            T1.CiscoCommand("encapsulation dot1Q 5");
            T1.CiscoCommand("ip address 192.168.139.1 255.255.255.0");
            T1.CiscoCommand("ip helper-address SKOLENS NETVÆRK");
            T1.CiscoCommand("exit");
            T1.CiscoCommand("ip dhcp pool vlandhcp");
            T1.CiscoCommand("network 192.168.139.0 255.255.255.0");
            T1.CiscoCommand("default-router 192.168.139.1");
            T1.CiscoCommand("exit");
            T1.CiscoCommand("exit");
        }
 
        //Show equipment specs
        public List<string> ShowInfo()
        {
            Result = T1.CiscoCommand("Show version");
 
            mylist.Add("Der er " + Result.Count + " members");
            Result.ForEach(delegate (String line)
            {
                // System image file is "flash:/c3560-ipservicesk9-mz.122-58.SE2.bin"
                Match match = Regex.Match(line, "System image file is \"(.*)\"$");
                if (match.Success)
                {
                    mylist.Add("IOS: " + match.Groups[1].Value);
                }
                //cisco WS-C3560-24TS (PowerPC405) processor (revision D0) with 131072K bytes of memory.
                match = Regex.Match(line, @"(\S+\s+\S+).*of memory.$");
                if (match.Success)
                {
                    mylist.Add("Model: " + match.Groups[1].Value);
                }
                //Processor board ID.
                match = Regex.Match(line, "Processor board ID\\W+(.*)");
                if (match.Success)
                {
                    mylist.Add("CPUID: " + match.Groups[1].Value);
                }
                //Ports available
                match = Regex.Match(line, @"(\d+)\s+(\S+).*IEEE.*");
                if (match.Success)
                {
                    mylist.Add((String)match.Groups[2].Value + ": " + match.Groups[1].Value);
                }
 
            });
            mylist.Add("IP: " + IP);
 
            return mylist;
 
        }
    }
}
This page was last modified on 18 January 2017, at 11:17. This page has been accessed 216 times.