Ping utility freezing up :(

  • Thread starter Thread starter Raenius
  • Start date Start date
R

Raenius

Hi all,

I am working on incorporating the C# ping Utility from
http://www.csharphelp.com/archives/archive6.html into my own winform
program.

I had to adjust some things (variables etc) for it to work but never
mind that. I am currently calling the function with IP addresses I
get out of my Database, this all goes well with no problems.

When I call the function and the host is up I get the ping back and
the reply time perfectly BUT when the host is down, the program
freezes and stops working until I force it to close...

Here is the code:


public void PingHost(string host) // was STATIC
{
//Declare the IPHostEntry
IPHostEntry serverHE=null, fromHE;
int nBytes = 0;
int dwStart = 0, dwStop = 0;
//Initilize a Socket of the Type ICMP
Socket socket = new Socket(AddressFamily.InterNetwork,
SocketType.Raw, ProtocolType.Icmp);

// Get the server endpoint
try
{
serverHE = Dns.GetHostByName(host);
}
catch(Exception m)
{
MessageBox.Show("Host not found");
MessageBox.Show(m.ToString(),"Error
Message");
return;
}

try
{
// Convert the server IP_EndPoint to an EndPoint
IPEndPoint ipepServer = new
IPEndPoint(serverHE.AddressList[0], 0);
EndPoint epServer = (ipepServer);

// Set the receiving endpoint to the client machine
fromHE =
Dns.GetHostByName(Dns.GetHostName());
IPEndPoint ipEndPointFrom = new
IPEndPoint(fromHE.AddressList[0], 0);
EndPoint EndPointFrom = (ipEndPointFrom);

int PacketSize = 0;
IcmpPacket packet = new IcmpPacket();
// Construct the packet to send
packet.Type = ICMP_ECHO; //8
packet.SubCode = 0;
packet.CheckSum = UInt16.Parse("0");
packet.Identifier =
UInt16.Parse("45");
packet.SequenceNumber =
UInt16.Parse("0");
int PingData = 32; // sizeof(IcmpPacket) - 8;
packet.Data = new Byte[PingData];
//Initilize the Packet.Data
for (int i = 0; i < PingData; i++)
{
packet.Data = (byte)'#';
}

//Variable to hold the total Packet size
PacketSize = PingData + 8;
Byte [] icmp_pkt_buffer = new Byte[ PacketSize
];
Int32 Index = 0;
//Call a Methos Serialize which counts
//The total number of Bytes in the Packet
Index = Serialize(
packet,
icmp_pkt_buffer,
PacketSize,
PingData );
//Error in Packet Size
if( Index == -1 )
{
MessageBox.Show("Error in Making
Packet");
return ;
}

// now get this critter into a UInt16 array

//Get the Half size of the Packet
Double double_length =
Convert.ToDouble(Index);
Double dtemp = Math.Ceiling( double_length /
2);
int cksum_buffer_length =
Convert.ToInt32(dtemp);
//Create a Byte Array
UInt16 [] cksum_buffer = new
UInt16[cksum_buffer_length];
//Code to initilize the Uint16 array
int icmp_header_buffer_index = 0;
for( int i = 0; i < cksum_buffer_length; i++
) {
cksum_buffer =

BitConverter.ToUInt16(icmp_pkt_buffer,icmp_header_buffer_index);
icmp_header_buffer_index += 2;
}
//Call a method which will return a checksum

UInt16 u_cksum = checksum(cksum_buffer,
cksum_buffer_length);
//Save the checksum to the Packet
packet.CheckSum = u_cksum;

// Now that we have the checksum, serialize the packet
again
Byte [] sendbuf = new Byte[ PacketSize
];
//again check the packet size
Index = Serialize(
packet,
sendbuf,
PacketSize,
PingData );
//if there is a error report it
if( Index == -1 )
{
MessageBox.Show("Error in Making
Packet");
return ;
}


dwStart = System.Environment.TickCount; // Start
timing
//send the Pack over the socket
if ((nBytes = socket.SendTo(sendbuf,
PacketSize, 0, epServer)) == SOCKET_ERROR)
{
MessageBox.Show("Socket Error cannot Send
Packet");
}
// Initialize the buffers. The receive buffer is the
size of the
// ICMP header plus the IP header (20 bytes)
Byte [] ReceiveBuffer = new Byte[256];

nBytes = 0;
//Receive the bytes
bool recd =false ;
int timeout=0 ;

//loop for checking the time of the server responding

while(!recd)
{
nBytes = socket.ReceiveFrom(ReceiveBuffer,
256, 0, ref EndPointFrom);
if (nBytes == SOCKET_ERROR)
{
MessageBox.Show("Host not
Responding") ;
recd=true ;
break;
}
else if(nBytes>0)
{
dwStop = System.Environment.TickCount -
dwStart; // stop timing
MessageBox.Show("Reply from
"+epServer.ToString()+" in "+dwStop+"MS
:Bytes Received"+nBytes);
recd=true;
break;
}
timeout=System.Environment.TickCount - dwStart;
if(timeout>1000)
{
MessageBox.Show("Time Out")
;
recd=true;
}

}

//close the socket
socket.Close();
}
catch(Exception n)
{
MessageBox.Show(n.ToString());
}
}

Does anyone have an idea what is going on? I thought it was the:

[code:1:62c411608b]
IPEndPoint ipepServer = new
IPEndPoint(serverHE.AddressList[0],
0);[/code:1:62c411608b]
part which can't be done if the host is down, I put in into a big
try/catch situation but no errors are reported the entire program
just freezes.

I hope someone can help me.

Kind regards,

Raenius
 
Have you not considered using WMI:

ConnectionOptions oConn = new ConnectionOptions();
oConn.Impersonation = ImpersonationLevel.Impersonate;
System.Management.ManagementScope oMs = new
System.Management.ManagementScope("\\\\MachineName\\root\\cimv2", oConn);
System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery();
oQuery.QueryString = "Select * FROM Win32_PingStatus WHERE Address =
'62.24.250.1'";
ManagementObjectSearcher oSearcher = new
ManagementObjectSearcher(oMs,oQuery);
ManagementObjectCollection oReturnCollection = oSearcher.Get();
foreach( ManagementObject oReturn in oReturnCollection )
foreach (PropertyData property in oReturn.Properties)
{
if(property.Value != null)
s.WriteLine(property.Name.ToString() + " Value = " +
property.Value);
}

Raenius said:
Hi all,

I am working on incorporating the C# ping Utility from
http://www.csharphelp.com/archives/archive6.html into my own winform
program.

I had to adjust some things (variables etc) for it to work but never
mind that. I am currently calling the function with IP addresses I
get out of my Database, this all goes well with no problems.

When I call the function and the host is up I get the ping back and
the reply time perfectly BUT when the host is down, the program
freezes and stops working until I force it to close...

Here is the code:


public void PingHost(string host) // was STATIC
{
//Declare the IPHostEntry
IPHostEntry serverHE=null, fromHE;
int nBytes = 0;
int dwStart = 0, dwStop = 0;
//Initilize a Socket of the Type ICMP
Socket socket = new Socket(AddressFamily.InterNetwork,
SocketType.Raw, ProtocolType.Icmp);

// Get the server endpoint
try
{
serverHE = Dns.GetHostByName(host);
}
catch(Exception m)
{
MessageBox.Show("Host not found");
MessageBox.Show(m.ToString(),"Error
Message");
return;
}

try
{
// Convert the server IP_EndPoint to an EndPoint
IPEndPoint ipepServer = new
IPEndPoint(serverHE.AddressList[0], 0);
EndPoint epServer = (ipepServer);

// Set the receiving endpoint to the client machine
fromHE =
Dns.GetHostByName(Dns.GetHostName());
IPEndPoint ipEndPointFrom = new
IPEndPoint(fromHE.AddressList[0], 0);
EndPoint EndPointFrom = (ipEndPointFrom);

int PacketSize = 0;
IcmpPacket packet = new IcmpPacket();
// Construct the packet to send
packet.Type = ICMP_ECHO; //8
packet.SubCode = 0;
packet.CheckSum = UInt16.Parse("0");
packet.Identifier =
UInt16.Parse("45");
packet.SequenceNumber =
UInt16.Parse("0");
int PingData = 32; // sizeof(IcmpPacket) - 8;
packet.Data = new Byte[PingData];
//Initilize the Packet.Data
for (int i = 0; i < PingData; i++)
{
packet.Data = (byte)'#';
}

//Variable to hold the total Packet size
PacketSize = PingData + 8;
Byte [] icmp_pkt_buffer = new Byte[ PacketSize
];
Int32 Index = 0;
//Call a Methos Serialize which counts
//The total number of Bytes in the Packet
Index = Serialize(
packet,
icmp_pkt_buffer,
PacketSize,
PingData );
//Error in Packet Size
if( Index == -1 )
{
MessageBox.Show("Error in Making
Packet");
return ;
}

// now get this critter into a UInt16 array

//Get the Half size of the Packet
Double double_length =
Convert.ToDouble(Index);
Double dtemp = Math.Ceiling( double_length /
2);
int cksum_buffer_length =
Convert.ToInt32(dtemp);
//Create a Byte Array
UInt16 [] cksum_buffer = new
UInt16[cksum_buffer_length];
//Code to initilize the Uint16 array
int icmp_header_buffer_index = 0;
for( int i = 0; i < cksum_buffer_length; i++
) {
cksum_buffer =

BitConverter.ToUInt16(icmp_pkt_buffer,icmp_header_buffer_index);
icmp_header_buffer_index += 2;
}
//Call a method which will return a checksum

UInt16 u_cksum = checksum(cksum_buffer,
cksum_buffer_length);
//Save the checksum to the Packet
packet.CheckSum = u_cksum;

// Now that we have the checksum, serialize the packet
again
Byte [] sendbuf = new Byte[ PacketSize
];
//again check the packet size
Index = Serialize(
packet,
sendbuf,
PacketSize,
PingData );
//if there is a error report it
if( Index == -1 )
{
MessageBox.Show("Error in Making
Packet");
return ;
}


dwStart = System.Environment.TickCount; // Start
timing
//send the Pack over the socket
if ((nBytes = socket.SendTo(sendbuf,
PacketSize, 0, epServer)) == SOCKET_ERROR)
{
MessageBox.Show("Socket Error cannot Send
Packet");
}
// Initialize the buffers. The receive buffer is the
size of the
// ICMP header plus the IP header (20 bytes)
Byte [] ReceiveBuffer = new Byte[256];

nBytes = 0;
//Receive the bytes
bool recd =false ;
int timeout=0 ;

//loop for checking the time of the server responding

while(!recd)
{
nBytes = socket.ReceiveFrom(ReceiveBuffer,
256, 0, ref EndPointFrom);
if (nBytes == SOCKET_ERROR)
{
MessageBox.Show("Host not
Responding") ;
recd=true ;
break;
}
else if(nBytes>0)
{
dwStop = System.Environment.TickCount -
dwStart; // stop timing
MessageBox.Show("Reply from
"+epServer.ToString()+" in "+dwStop+"MS
:Bytes Received"+nBytes);
recd=true;
break;
}
timeout=System.Environment.TickCount - dwStart;
if(timeout>1000)
{
MessageBox.Show("Time Out")
;
recd=true;
}

}

//close the socket
socket.Close();
}
catch(Exception n)
{
MessageBox.Show(n.ToString());
}
}

Does anyone have an idea what is going on? I thought it was the:

[code:1:62c411608b]
IPEndPoint ipepServer = new
IPEndPoint(serverHE.AddressList[0],
0);[/code:1:62c411608b]
part which can't be done if the host is down, I put in into a big
try/catch situation but no errors are reported the entire program
just freezes.

I hope someone can help me.

Kind regards,

Raenius
Click to expand...
 
You may also look at iphlpapi.dll. Has a ICMP method in it that works good
and you don't have to be Admin (IIRC).

--
William Stacey, MS MVP


Raenius said:
Hi all,

I am working on incorporating the C# ping Utility from
http://www.csharphelp.com/archives/archive6.html into my own winform
program.

I had to adjust some things (variables etc) for it to work but never
mind that. I am currently calling the function with IP addresses I
get out of my Database, this all goes well with no problems.

When I call the function and the host is up I get the ping back and
the reply time perfectly BUT when the host is down, the program
freezes and stops working until I force it to close...

Here is the code:


public void PingHost(string host) // was STATIC
{
//Declare the IPHostEntry
IPHostEntry serverHE=null, fromHE;
int nBytes = 0;
int dwStart = 0, dwStop = 0;
//Initilize a Socket of the Type ICMP
Socket socket = new Socket(AddressFamily.InterNetwork,
SocketType.Raw, ProtocolType.Icmp);

// Get the server endpoint
try
{
serverHE = Dns.GetHostByName(host);
}
catch(Exception m)
{
MessageBox.Show("Host not found");
MessageBox.Show(m.ToString(),"Error
Message");
return;
}

try
{
// Convert the server IP_EndPoint to an EndPoint
IPEndPoint ipepServer = new
IPEndPoint(serverHE.AddressList[0], 0);
EndPoint epServer = (ipepServer);

// Set the receiving endpoint to the client machine
fromHE =
Dns.GetHostByName(Dns.GetHostName());
IPEndPoint ipEndPointFrom = new
IPEndPoint(fromHE.AddressList[0], 0);
EndPoint EndPointFrom = (ipEndPointFrom);

int PacketSize = 0;
IcmpPacket packet = new IcmpPacket();
// Construct the packet to send
packet.Type = ICMP_ECHO; //8
packet.SubCode = 0;
packet.CheckSum = UInt16.Parse("0");
packet.Identifier =
UInt16.Parse("45");
packet.SequenceNumber =
UInt16.Parse("0");
int PingData = 32; // sizeof(IcmpPacket) - 8;
packet.Data = new Byte[PingData];
//Initilize the Packet.Data
for (int i = 0; i < PingData; i++)
{
packet.Data = (byte)'#';
}

//Variable to hold the total Packet size
PacketSize = PingData + 8;
Byte [] icmp_pkt_buffer = new Byte[ PacketSize
];
Int32 Index = 0;
//Call a Methos Serialize which counts
//The total number of Bytes in the Packet
Index = Serialize(
packet,
icmp_pkt_buffer,
PacketSize,
PingData );
//Error in Packet Size
if( Index == -1 )
{
MessageBox.Show("Error in Making
Packet");
return ;
}

// now get this critter into a UInt16 array

//Get the Half size of the Packet
Double double_length =
Convert.ToDouble(Index);
Double dtemp = Math.Ceiling( double_length /
2);
int cksum_buffer_length =
Convert.ToInt32(dtemp);
//Create a Byte Array
UInt16 [] cksum_buffer = new
UInt16[cksum_buffer_length];
//Code to initilize the Uint16 array
int icmp_header_buffer_index = 0;
for( int i = 0; i < cksum_buffer_length; i++
) {
cksum_buffer =

BitConverter.ToUInt16(icmp_pkt_buffer,icmp_header_buffer_index);
icmp_header_buffer_index += 2;
}
//Call a method which will return a checksum

UInt16 u_cksum = checksum(cksum_buffer,
cksum_buffer_length);
//Save the checksum to the Packet
packet.CheckSum = u_cksum;

// Now that we have the checksum, serialize the packet
again
Byte [] sendbuf = new Byte[ PacketSize
];
//again check the packet size
Index = Serialize(
packet,
sendbuf,
PacketSize,
PingData );
//if there is a error report it
if( Index == -1 )
{
MessageBox.Show("Error in Making
Packet");
return ;
}


dwStart = System.Environment.TickCount; // Start
timing
//send the Pack over the socket
if ((nBytes = socket.SendTo(sendbuf,
PacketSize, 0, epServer)) == SOCKET_ERROR)
{
MessageBox.Show("Socket Error cannot Send
Packet");
}
// Initialize the buffers. The receive buffer is the
size of the
// ICMP header plus the IP header (20 bytes)
Byte [] ReceiveBuffer = new Byte[256];

nBytes = 0;
//Receive the bytes
bool recd =false ;
int timeout=0 ;

//loop for checking the time of the server responding

while(!recd)
{
nBytes = socket.ReceiveFrom(ReceiveBuffer,
256, 0, ref EndPointFrom);
if (nBytes == SOCKET_ERROR)
{
MessageBox.Show("Host not
Responding") ;
recd=true ;
break;
}
else if(nBytes>0)
{
dwStop = System.Environment.TickCount -
dwStart; // stop timing
MessageBox.Show("Reply from
"+epServer.ToString()+" in "+dwStop+"MS
:Bytes Received"+nBytes);
recd=true;
break;
}
timeout=System.Environment.TickCount - dwStart;
if(timeout>1000)
{
MessageBox.Show("Time Out")
;
recd=true;
}

}

//close the socket
socket.Close();
}
catch(Exception n)
{
MessageBox.Show(n.ToString());
}
}

Does anyone have an idea what is going on? I thought it was the:

[code:1:62c411608b]
IPEndPoint ipepServer = new
IPEndPoint(serverHE.AddressList[0],
0);[/code:1:62c411608b]
part which can't be done if the host is down, I put in into a big
try/catch situation but no errors are reported the entire program
just freezes.

I hope someone can help me.

Kind regards,

Raenius
Click to expand...
 
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