Trying to send an ARP(Address Resolution Protocol) Message with Socket

[Shoveler]

I'm trying to send an ARP to determine different devices on the
network. I need to see the MAC address of my devices on my LAN. With
the MAC I can determine if I need to talk to that devices. I figured
the ARP is the best we to find who is out there. I'm using C# and the
Raw SocketType. I run into the WSACancelBlockingCall problem. Here's
my code:

Socket MyPing = new Socket(AddressFamily.InterNetwork,
SocketType.Raw , ProtocolType.IP );

MyPing.SetSocketOption(SocketOptionLevel.IP,
SocketOptionName.HeaderIncluded, true);

byte[] DataARP = new byte[] { 00, 0x01, 0x08, 0x00, 0x06, 0x04, 0x00,
0x01, 0x00, 0x13, 0x8f, 0x88, 0xe1, 0x51, 0xc0, 0xa8, 0x00, 0x03, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xa8, 0x00, 0x0a };

//Fake an IP Address so I can send with SendTo
IPAddress IP = new IPAddress(new byte[] { 192, 168, 1, 1
});
IPEndPoint IPEP = new IPEndPoint(IP, 5931);

//Local IP for Receiving
IPEndPoint Local = new IPEndPoint(IPAddress.Any, 0);
EndPoint EP = (EndPoint)Local;

MyPing.SendTo(DataARP, IPEP);





It's a very simple app. All I want to do is send data only with the
Eithernet II Header. I figured I need a Raw socket, but it's canceling
my sending. I'm debuging with Ethereal.

 

[Tom Shelton]

I'm trying to send an ARP to determine different devices on the
network. I need to see the MAC address of my devices on my LAN. With
the MAC I can determine if I need to talk to that devices. I figured
the ARP is the best we to find who is out there. I'm using C# and the
Raw SocketType. I run into the WSACancelBlockingCall problem. Here's
my code:

Socket MyPing = new Socket(AddressFamily.InterNetwork,
SocketType.Raw , ProtocolType.IP );

MyPing.SetSocketOption(SocketOptionLevel.IP,
SocketOptionName.HeaderIncluded, true);

byte[] DataARP = new byte[] { 00, 0x01, 0x08, 0x00, 0x06, 0x04, 0x00,
0x01, 0x00, 0x13, 0x8f, 0x88, 0xe1, 0x51, 0xc0, 0xa8, 0x00, 0x03, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xa8, 0x00, 0x0a };

//Fake an IP Address so I can send with SendTo
IPAddress IP = new IPAddress(new byte[] { 192, 168, 1, 1
});
IPEndPoint IPEP = new IPEndPoint(IP, 5931);

//Local IP for Receiving
IPEndPoint Local = new IPEndPoint(IPAddress.Any, 0);
EndPoint EP = (EndPoint)Local;

MyPing.SendTo(DataARP, IPEP);





It's a very simple app. All I want to do is send data only with the
Eithernet II Header. I figured I need a Raw socket, but it's canceling
my sending. I'm debuging with Ethereal.

I'm no expert on raw sockets - I've never used them... But, didn't xp sp2
remove (or severly) limit access to raw sockets? Assuming your doing this
on an XP SP2 box

 

[Markus Stoeger]

I figured the ARP is the best we to find who is out there.

Have you considered sending a UDP broadcast to which your devices send a
reply?

hth,
Max

 

[chanmm]

Try to use WMI class:
http://msdn.microsoft.com/library/d...sdk/wmi/win32_networkadapterconfiguration.asp

The link is for Win32. .Net framework will be System.Management Class.

Hope it helps.

chanmm

 

[Shoveler]

Have you considered sending a UDP broadcast to which your devices send a
reply?

hth,
Max

The devices I need to talk with do use UDP for communication, but I'd
rather try to find it by his MAC Address. If there's any other way to
retrieve the MAC within C#, I'm all ears. Is there a way to access the
ARP Cache in the system?

 

[Shoveler]

I'm no expert on raw sockets - I've never used them... But, didn't xp sp2
remove (or severly) limit access to raw sockets? Assuming your doing this
on an XP SP2 box

Yup, I'm using WinXP with SP2. I'm using C# 2005 Express Edition. I
was wondering if I upgraded to the Pro, I would be able to use all
Socket functions?

 

[Tom Shelton]

Yup, I'm using WinXP with SP2. I'm using C# 2005 Express Edition. I
was wondering if I upgraded to the Pro, I would be able to use all
Socket functions?

If you are indeed running into the XPSP2 raw socket limitations, then
upgrading to Pro won't help. This is a limitation of the OS. One way to
test is to try on a pre sp2 XP box.

 

[Shoveler]

Thanks for the info guys!

I'm already running XP Pro, I was thinking about the C#2005 Pro, but
the OS still limits it. I've downloaded a C# converted app of WinPcap.
It works great for downloading entire packets, so I now have access to
the MAC Address of each device on the LAN that sends a message. I
really don't need to send ARP commands, I'll just let to OS do it when
I ping.