问题
According to this link: using System.Net.NetworkInformation, is there a way to bind a ping to a specific interface? the ICMP cannot be bound to a Network Interface (unlike socket based stuff):
ICMP is not socket based. The ping will be sent to the appropriate port based on the routing table.https://stackoverflow.com/editing-help
But I can't see any proper way for getting the information about the "pinger". At least, in a shell command I could specify the source IP Address but not when I'm using the Ping class.
I tried to perform programmatically some traceroutes to get which IP Addresses are involved in the Ping route but I did not get the IP Address of the Network Interface (I guess it comes from the fact I cannot set the TTL to 0).
Any idea about how figure out which Network Interface is used for a certain ping? (or a way to specify which Network Interface to use for pinging).
回答1:
i know this is a old question but i found a solution and want to share it.
I posted it on CodeProject here is the link: http://www.codeproject.com/Questions/828234/Ping-over-specific-Interface-with-IcmpSendEchoEx?loginkey=false
Edited:
So the solution was to use the IcmpSendEcho2Ex function in Iphlpapi.dll.
This function takes the interface ipaddress to determine on which interface the ping should be sended.
The link includes the p invoke and a reply class which wraps the output of the function.
Code from codeproject:
public static PingReply Send(IPAddress srcAddress, IPAddress destAddress, int timeout = 5000, byte[] buffer = null, PingOptions po = null)
{
if (destAddress == null || destAddress.AddressFamily != AddressFamily.InterNetwork || destAddress.Equals(IPAddress.Any))
throw new ArgumentException();
//Defining pinvoke args
var source = srcAddress == null ? 0 : BitConverter.ToUInt32(srcAddress.GetAddressBytes(), 0);
var destination = BitConverter.ToUInt32(destAddress.GetAddressBytes(), 0);
var sendbuffer = buffer ?? new byte[] {};
var options = new Interop.Option
{
Ttl = (po == null ? (byte) 255 : (byte) po.Ttl),
Flags = (po == null ? (byte) 0 : po.DontFragment ? (byte) 0x02 : (byte) 0) //0x02
};
var fullReplyBufferSize = Interop.ReplyMarshalLength + sendbuffer.Length; //Size of Reply struct and the transmitted buffer length.
var allocSpace = Marshal.AllocHGlobal(fullReplyBufferSize); // unmanaged allocation of reply size. TODO Maybe should be allocated on stack
try
{
DateTime start = DateTime.Now;
var nativeCode = Interop.IcmpSendEcho2Ex(
Interop.IcmpHandle, //_In_ HANDLE IcmpHandle,
default(IntPtr), //_In_opt_ HANDLE Event,
default(IntPtr), //_In_opt_ PIO_APC_ROUTINE ApcRoutine,
default(IntPtr), //_In_opt_ PVOID ApcContext
source, //_In_ IPAddr SourceAddress,
destination, //_In_ IPAddr DestinationAddress,
sendbuffer, //_In_ LPVOID RequestData,
(short) sendbuffer.Length, //_In_ WORD RequestSize,
ref options, //_In_opt_ PIP_OPTION_INFORMATION RequestOptions,
allocSpace, //_Out_ LPVOID ReplyBuffer,
fullReplyBufferSize, //_In_ DWORD ReplySize,
timeout //_In_ DWORD Timeout
);
TimeSpan duration = DateTime.Now - start;
var reply = (Interop.Reply) Marshal.PtrToStructure(allocSpace, typeof (Interop.Reply)); // Parse the beginning of reply memory to reply struct
byte[] replyBuffer = null;
if (sendbuffer.Length != 0)
{
replyBuffer = new byte[sendbuffer.Length];
Marshal.Copy(allocSpace + Interop.ReplyMarshalLength, replyBuffer, 0, sendbuffer.Length); //copy the rest of the reply memory to managed byte[]
}
if (nativeCode == 0) //Means that native method is faulted.
return new PingReply(nativeCode, reply.Status, new IPAddress(reply.Address), duration);
else
return new PingReply(nativeCode, reply.Status, new IPAddress(reply.Address), reply.RoundTripTime, replyBuffer);
}
finally
{
Marshal.FreeHGlobal(allocSpace); //free allocated space
}
}
/// <summary>Interoperability Helper
/// <see cref="http://msdn.microsoft.com/en-us/library/windows/desktop/bb309069(v=vs.85).aspx" />
/// </summary>
private static class Interop
{
private static IntPtr? icmpHandle;
private static int? _replyStructLength;
/// <summary>Returns the application legal icmp handle. Should be close by IcmpCloseHandle
/// <see cref="http://msdn.microsoft.com/en-us/library/windows/desktop/aa366045(v=vs.85).aspx" />
/// </summary>
public static IntPtr IcmpHandle
{
get
{
if (icmpHandle == null)
{
icmpHandle = IcmpCreateFile();
//TODO Close Icmp Handle appropiate
}
return icmpHandle.GetValueOrDefault();
}
}
/// <summary>Returns the the marshaled size of the reply struct.</summary>
public static int ReplyMarshalLength
{
get
{
if (_replyStructLength == null)
{
_replyStructLength = Marshal.SizeOf(typeof (Reply));
}
return _replyStructLength.GetValueOrDefault();
}
}
[DllImport("Iphlpapi.dll", SetLastError = true)]
private static extern IntPtr IcmpCreateFile();
[DllImport("Iphlpapi.dll", SetLastError = true)]
private static extern bool IcmpCloseHandle(IntPtr handle);
[DllImport("Iphlpapi.dll", SetLastError = true)]
public static extern uint IcmpSendEcho2Ex(IntPtr icmpHandle, IntPtr Event, IntPtr apcroutine, IntPtr apccontext, UInt32 sourceAddress, UInt32 destinationAddress, byte[] requestData, short requestSize, ref Option requestOptions, IntPtr replyBuffer, int replySize, int timeout);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct Option
{
public byte Ttl;
public readonly byte Tos;
public byte Flags;
public readonly byte OptionsSize;
public readonly IntPtr OptionsData;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct Reply
{
public readonly UInt32 Address;
public readonly int Status;
public readonly int RoundTripTime;
public readonly short DataSize;
public readonly short Reserved;
public readonly IntPtr DataPtr;
public readonly Option Options;
}
}
[Serializable]
public class PingReply
{
private readonly byte[] _buffer = null;
private readonly IPAddress _ipAddress = null;
private readonly uint _nativeCode = 0;
private readonly TimeSpan _roundTripTime = TimeSpan.Zero;
private readonly IPStatus _status = IPStatus.Unknown;
private Win32Exception _exception;
internal PingReply(uint nativeCode, int replystatus, IPAddress ipAddress, TimeSpan duration)
{
_nativeCode = nativeCode;
_ipAddress = ipAddress;
if (Enum.IsDefined(typeof (IPStatus), replystatus))
_status = (IPStatus) replystatus;
}
internal PingReply(uint nativeCode, int replystatus, IPAddress ipAddress, int roundTripTime, byte[] buffer)
{
_nativeCode = nativeCode;
_ipAddress = ipAddress;
_roundTripTime = TimeSpan.FromMilliseconds(roundTripTime);
_buffer = buffer;
if (Enum.IsDefined(typeof (IPStatus), replystatus))
_status = (IPStatus) replystatus;
}
/// <summary>Native result from <code>IcmpSendEcho2Ex</code>.</summary>
public uint NativeCode
{
get { return _nativeCode; }
}
public IPStatus Status
{
get { return _status; }
}
/// <summary>The source address of the reply.</summary>
public IPAddress IpAddress
{
get { return _ipAddress; }
}
public byte[] Buffer
{
get { return _buffer; }
}
public TimeSpan RoundTripTime
{
get { return _roundTripTime; }
}
/// <summary>Resolves the <code>Win32Exception</code> from native code</summary>
public Win32Exception Exception
{
get
{
if (Status != IPStatus.Success)
return _exception ?? (_exception = new Win32Exception((int) NativeCode, Status.ToString()));
else
return null;
}
}
public override string ToString()
{
if (Status == IPStatus.Success)
return Status + " from " + IpAddress + " in " + RoundTripTime + " ms with " + Buffer.Length + " bytes";
else if (Status != IPStatus.Unknown)
return Status + " from " + IpAddress;
else
return Exception.Message + " from " + IpAddress;
}
}
来源：https://stackoverflow.com/questions/22575485/how-to-ping-using-a-specific-network-interface-or-a-specific-source-ip-address