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9.7

Ping result missing some failures

Asked by mikelittlewood in Delphi Programming

Tags: Delphi 7

I have written a very small ping wild card application that will search an entire range of ip's, i.e. 192.168.0.x so it will ping from 192.168.0.0 to 192.168.0.254 and tell me whether it is getting a response or not and hen if it does it does a reverse dns lookup.

My problem is that the result is sometimes incorrect for a specific scenario.
I only thought I would expect a pass or fail but it seems that is counts a TTL expired in transit response as a pass, obviously because of the simple method I am using, or a return value I dont know to check.

Below is a copy of the unit of code I am using, and I just call ping( 192.168.0.0)
The result obviously comes from result := ( DW <> 0);
Is there anything else I can check?

As for some more information
A valid ping response looks like this

Pinging 192.168.0.0 with 32 bytes of data:

Reply from 192.168.0.0: bytes=32 time=6ms TTL=255
Reply from 192.168.0.0: bytes=32 time=1ms TTL=255
Reply from 192.168.0.0: bytes=32 time=4ms TTL=255
Reply from 192.168.0.0: bytes=32 time=1ms TTL=255

Ping statistics for 192.168.0.0:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 6ms, Average = 3ms

and an invalid one looks might look like this:

Pinging 192.168.0.1 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.0.1:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),


or look like this

Pinging 192.168.0.2 with 32 bytes of data:

Reply from 192.168.0.2: TTL expired in transit.
Reply from 192.168.0.2: TTL expired in transit.
Reply from 192.168.0.2: TTL expired in transit.
Reply from 192.168.0.2: TTL expired in transit.

Ping statistics for 192.168.0.2:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms 
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unit raw_ping;
 
interface
 
uses
   Windows, SysUtils, Classes;
 
type
   TSunB = packed record
      s_b1, s_b2, s_b3, s_b4: byte;
   end;
 
   TSunW = packed record
      s_w1, s_w2: word;
   end;
 
   PIPAddr = ^TIPAddr;
   TIPAddr = record
      case integer of
         0: (S_un_b: TSunB);
         1: (S_un_w: TSunW);
         2: (S_addr: longword);
      end;
 
 IPAddr = TIPAddr;
 
function IcmpCreateFile: THandle; stdcall; external 'icmp.dll';
function IcmpCloseHandle( icmpHandle : THandle) : boolean; stdcall; external 'icmp.dll'
function IcmpSendEcho( IcmpHandle : THandle; DestinationAddress : IPAddr;
                       RequestData : Pointer; RequestSize : Smallint;
                       RequestOptions : pointer;
                       ReplyBuffer : Pointer;
                       ReplySize : DWORD;
                       Timeout : DWORD) : DWORD; stdcall; external 'icmp.dll';
 
 
function Ping(InetAddress : string) : boolean;
 
procedure TranslateStringToTInAddr( AIP: string; var AInAddr);
 
implementation
 
uses
   WinSock;
 
function Fetch( var AInput: string; const ADelim: string = ' ';
                const ADelete: Boolean = true): string;
var
  iPos: Integer;
begin
   if ADelim = #0 then
   begin
      // AnsiPos does not work with #0
      iPos := Pos(ADelim, AInput);
   end else
      begin
         iPos := Pos(ADelim, AInput);
      end;
 
   if iPos = 0 then
   begin
      Result := AInput;
 
      if ADelete then
      begin
         AInput := '';
      end;
   end else
      begin
         result := Copy(AInput, 1, iPos - 1);
         if ADelete then
         begin
            Delete(AInput, 1, iPos + Length(ADelim) - 1);
         end;
      end;
end;
 
procedure TranslateStringToTInAddr(AIP: string; var AInAddr);
var
   phe: PHostEnt;
   pac: PChar;
   GInitData: TWSAData;
begin
   WSAStartup($101, GInitData);
   try
      phe := GetHostByName(PChar(AIP));
      if Assigned(phe) then
      begin
         pac := phe^.h_addr_list^;
         if Assigned(pac) then
         begin
            with TIPAddr(AInAddr).S_un_b do
            begin
               s_b1 := Byte(pac[0]);
               s_b2 := Byte(pac[1]);
               s_b3 := Byte(pac[2]);
               s_b4 := Byte(pac[3]);
            end;
         end else
            begin
               raise Exception.Create('Error getting IP from HostName');
            end;
      end else
         begin
            raise Exception.Create('Error getting HostName');
         end;
   except
      FillChar(AInAddr, SizeOf(AInAddr), #0);
   end;
   WSACleanup;
end;
 
function Ping( InetAddress : string) : boolean;
var
   handle: THandle;
   inAddr: IPAddr;
   DW: DWORD;
   rep: array[ 1..128] of byte;
begin
   result := false;
   handle := IcmpCreateFile;
   if handle = INVALID_HANDLE_VALUE then
      exit;
 
   translateStringToTInAddr( inetAddress, inAddr);
   DW := icmpSendEcho( handle, inAddr, nil, 0, nil, @rep, 128, 0);
   result := ( DW <> 0);
   icmpCloseHandle(Handle);
end;
 
end.
[+][-]06/19/08 11:21 AM, ID: 21824883Accepted Solution

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About this solution

Zone: Delphi Programming
Tags: Delphi 7
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Solution Provided By: rllibby
Participating Experts: 2
Solution Grade: A
 
[+][-]06/18/08 02:16 AM, ID: 21811204Expert Comment

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