If you have ever tried to create a traceroute program using one of the few available ICMP libraries freely available for C# you may have run into some issues mainly to do with the ICMP checksum not being correct. It seems that as of .NET 2.0 framework that microsoft included a Ping class that makes it really easy to then use it to create a traceroute utility. Here is some basic code to create a traceroute utility.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | public string Traceroute(string ipAddressOrHostName)
{
IPAddress ipAddress = Dns.GetHostEntry(ipAddressOrHostName).AddressList[0];
StringBuilder traceResults = new StringBuilder();
using(Ping pingSender = new Ping())
{
PingOptions pingOptions = new PingOptions();
Stopwatch stopWatch = new Stopwatch();
byte[] bytes = new byte[32];
pingOptions.DontFragment = true;
pingOptions.Ttl = 1;
int maxHops = 30;
traceResults.AppendLine(
string.Format(
"Tracing route to {0} over a maximum of {1} hops:",
ipAddress,
maxHops));
traceResults.AppendLine();
for(int i = 1; i < maxHops + 1; i++)
{
stopWatch.Reset();
stopWatch.Start();
PingReply pingReply = pingSender.Send(
ipAddress,
5000,
new byte[32], pingOptions);
stopWatch.Stop();
traceResults.AppendLine(
string.Format("{0}\t{1} ms\t{2}",
i,
stopWatch.ElapsedMilliseconds,
pingReply.Address));
if(pingReply.Status == IPStatus.Success)
{
traceResults.AppendLine();
traceResults.AppendLine("Trace complete."); break;
}
pingOptions.Ttl++;
}
}
return traceResults.ToString();
}
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