Cisco Router
/*
C# Network Programming
by Richard Blum
Publisher: Sybex
ISBN: 0782141765
*/
using System.Net;
using System.Net.Sockets;
using System;
using System.Drawing;
using System.IO;
using System.Threading;
using System.Windows.Forms;
public class CiscoRouter : Form
{
private TextBox host;
private TextBox community;
private ListBox results;
private Thread monitor;
private FileStream fs;
private StreamWriter sw;
public CiscoRouter()
{
Text = "Cisco Router Utilization";
Size = new Size(400, 380);
Label label1 = new Label();
label1.Parent = this;
label1.Text = "Host:";
label1.AutoSize = true;
label1.Location = new Point(10, 30);
host = new TextBox();
host.Parent = this;
host.Size = new Size(170, 2 * Font.Height);
host.Location = new Point(40, 27);
Label label2 = new Label();
label2.Parent = this;
label2.Text = "Community:";
label2.AutoSize = true;
label2.Location = new Point(10, 60);
community = new TextBox();
community.Parent = this;
community.Size = new Size(170, 2 * Font.Height);
community.Location = new Point(75, 57);
results = new ListBox();
results.Parent = this;
results.Location = new Point(10, 85);
results.Size = new Size(360, 18 * Font.Height);
Button start = new Button();
start.Parent = this;
start.Text = "Start";
start.Location = new Point(250, 52);
start.Size = new Size(5 * Font.Height, 2 * Font.Height);
start.Click += new EventHandler(ButtonStartOnClick);
Button stop = new Button();
stop.Parent = this;
stop.Text = "Stop";
stop.Location = new Point(320, 52);
stop.Size = new Size(5 * Font.Height, 2 * Font.Height);
stop.Click += new EventHandler(ButtonStopOnClick);
}
void ButtonStartOnClick(Object obj, EventArgs ea)
{
monitor = new Thread(new ThreadStart(checkRouter));
monitor.IsBackground = true;
monitor.Start();
}
void ButtonStopOnClick(Object obj, EventArgs ea)
{
monitor.Abort();
sw.Close();
fs.Close();
}
void checkRouter()
{
int commlength, miblength, datastart, cpuUtil;
SNMP conn = new SNMP();
byte[] response = new byte[1024];
DateTime time;
string logFile = "routerlog.txt";
fs = new FileStream(logFile, FileMode.OpenOrCreate,
FileAccess.ReadWrite);
sw = new StreamWriter(fs);
while (true)
{
response = conn.get("get", host.Text,
community.Text, "1.3.6.1.4.1.9.2.1.58.0");
if (response[0] == 0xff)
{
results.Items.Add("No reponse from host");
sw.WriteLine("No response from host");
sw.Flush();
break;
}
commlength = Convert.ToInt16(response[6]);
miblength = Convert.ToInt16(response[23 + commlength]);
datastart = 26 + commlength + miblength;
cpuUtil = Convert.ToInt16(response[datastart]);
time = DateTime.Now;
results.Items.Add(time + " CPU Utilization: " + cpuUtil + "%");
sw.WriteLine("{0} CPU Utilization: {1}%", time, cpuUtil);
sw.Flush();
Thread.Sleep(5 * 60000);
}
}
public static void Main()
{
Application.Run(new CiscoRouter());
}
}
class SNMP
{
public SNMP()
{
}
public byte[] get(string request, string host, string community, string mibstring)
{
byte[] packet = new byte[1024];
byte[] mib = new byte[1024];
int snmplen;
int comlen = community.Length;
string[] mibvals = mibstring.Split('.');
int miblen = mibvals.Length;
int cnt = 0, temp, i;
int orgmiblen = miblen;
int pos = 0;
// Convert the string MIB into a byte array of integer values
// Unfortunately, values over 128 require multiple bytes
// which also increases the MIB length
for (i = 0; i < orgmiblen; i++)
{
temp = Convert.ToInt16(mibvals[i]);
if (temp > 127)
{
mib[cnt] = Convert.ToByte(128 + (temp / 128));
mib[cnt + 1] = Convert.ToByte(temp - ((temp / 128) * 128));
cnt += 2;
miblen++;
} else
{
mib[cnt] = Convert.ToByte(temp);
cnt++;
}
}
snmplen = 29 + comlen + miblen - 1; //Length of entire SNMP packet
//The SNMP sequence start
packet[pos++] = 0x30; //Sequence start
packet[pos++] = Convert.ToByte(snmplen - 2); //sequence size
//SNMP version
packet[pos++] = 0x02; //Integer type
packet[pos++] = 0x01; //length
packet[pos++] = 0x00; //SNMP version 1
//Community name
packet[pos++] = 0x04; // String type
packet[pos++] = Convert.ToByte(comlen); //length
//Convert community name to byte array
byte[] data = Encoding.ASCII.GetBytes(community);
for (i = 0; i < data.Length; i++)
{
packet[pos++] = data[i];
}
//Add GetRequest or GetNextRequest value
if (request == "get")
packet[pos++] = 0xA0;
else
packet[pos++] = 0xA1;
packet[pos++] = Convert.ToByte(20 + miblen - 1); //Size of total MIB
//Request ID
packet[pos++] = 0x02; //Integer type
packet[pos++] = 0x04; //length
packet[pos++] = 0x00; //SNMP request ID
packet[pos++] = 0x00;
packet[pos++] = 0x00;
packet[pos++] = 0x01;
//Error status
packet[pos++] = 0x02; //Integer type
packet[pos++] = 0x01; //length
packet[pos++] = 0x00; //SNMP error status
//Error index
packet[pos++] = 0x02; //Integer type
packet[pos++] = 0x01; //length
packet[pos++] = 0x00; //SNMP error index
//Start of variable bindings
packet[pos++] = 0x30; //Start of variable bindings sequence
packet[pos++] = Convert.ToByte(6 + miblen - 1); // Size of variable binding
packet[pos++] = 0x30; //Start of first variable bindings sequence
packet[pos++] = Convert.ToByte(6 + miblen - 1 - 2); // size
packet[pos++] = 0x06; //Object type
packet[pos++] = Convert.ToByte(miblen - 1); //length
//Start of MIB
packet[pos++] = 0x2b;
//Place MIB array in packet
for(i = 2; i < miblen; i++)
packet[pos++] = Convert.ToByte(mib[i]);
packet[pos++] = 0x05; //Null object value
packet[pos++] = 0x00; //Null
//Send packet to destination
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,
ProtocolType.Udp);
sock.SetSocketOption(SocketOptionLevel.Socket,
SocketOptionName.ReceiveTimeout, 5000);
IPHostEntry ihe = Dns.Resolve(host);
IPEndPoint iep = new IPEndPoint(ihe.AddressList[0], 161);
EndPoint ep = (EndPoint)iep;
sock.SendTo(packet, snmplen, SocketFlags.None, iep);
//Receive response from packet
try
{
int recv = sock.ReceiveFrom(packet, ref ep);
} catch (SocketException)
{
packet[0] = 0xff;
}
return packet;
}
public string getnextMIB(byte[] mibin)
{
string output = "1.3";
int commlength = mibin[6];
int mibstart = 6 + commlength + 17; //find the start of the mib section
//The MIB length is the length defined in the SNMP packet
// minus 1 to remove the ending .0, which is not used
int miblength = mibin[mibstart] - 1;
mibstart += 2; //skip over the length and 0x2b values
int mibvalue;
for(int i = mibstart; i < mibstart + miblength; i++)
{
mibvalue = Convert.ToInt16(mibin[i]);
if (mibvalue > 128)
{
mibvalue = (mibvalue/128)*128 + Convert.ToInt16(mibin[i+1]);
i++;
}
output += "." + mibvalue;
}
return output;
}
}
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