unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs,winsock, StdCtrls;

type
IPINFO = record
Ttl :char;
Tos :char;
IPFlags :char;
OptSize :char;
Options :^char;
end;

type
ICMPECHO = record
Source :longint;
Status :longint;
RTTime :longint;
DataSize:Shortint;
Reserved:Shortint;
pData :^variant;
i_ipinfo:IPINFO;
end;
TIcmpCreateFile = function():integer; {$IFDEF WIN32} stdcall; {$ENDIF}
TIcmpCloseHandle = procedure(var handle:integer);{$IFDEF WIN32} stdcall; {$ENDIF}
TIcmpSendEcho = function(var handle:integer; endereco:DWORD; buffer:variant; tam:WORD; IP:IPINFO; ICMP:ICMPECHO; tamicmp:DWORD; tempo:DWORD):DWORD;{$IFDEF WIN32} stdcall; {$ENDIF}

type
TForm1 = class(TForm)
Edit1: TEdit;
Memo1: TMemo;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;





var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
wsadt : wsadata;
icmp :icmpecho;
HNDicmp : integer;
hndFile :integer;
Host :PHostEnt;
Destino :in_addr;
Endereco :^DWORD;
IP : ipinfo;
Retorno :integer;
dwRetorno :DWORD;
x :integer;

IcmpCreateFile : TIcmpCreateFile;
IcmpCloseHandle : TIcmpCloseHandle;
IcmpSendEcho : TIcmpSendEcho;

begin
if (edit1.Text = '') then begin
Application.MessageBox('Enter a HostName ro a IP Adress',
'Error', MB_OK);
exit;
end;
HNDicmp := LoadLibrary('ICMP.DLL');
if (HNDicmp <> 0) then begin
@IcmpCreateFile := GetProcAddress(HNDicmp,'IcmpCreateFile');
@IcmpCloseHandle := GetProcAddress(HNDicmp,'IcmpCloseHandle');
@IcmpSendEcho := GetProcAddress(HNDicmp,'IcmpSendEcho');
if (@IcmpCreateFile=nil) or (@IcmpCloseHandle=nil) or (@IcmpSendEcho=nil) then begin
Application.MessageBox('Error getting ICMP Adress','Error', MB_OK);
FreeLibrary(HNDicmp);
end;
end;
Retorno := WSAStartup($0101,wsadt);

if (Retorno <> 0) then begin
Application.MessageBox('Can´t Load WinSockets','WSAStartup', MB_OK);
WSACleanup();
FreeLibrary(HNDicmp);
end;

Destino.S_addr := inet_addr(Pchar(Edit1.text));
if (Destino.S_addr = 0) then begin
Host := GetHostbyName(PChar(Edit1.text));
end
else begin
Host := GetHostbyAddr(@Destino,sizeof(in_addr), AF_INET);
end;

if (host = nil) then begin
Application.MessageBox('Host not found','Error', MB_OK);
WSACleanup();
FreeLibrary(HNDicmp);
exit;
end;
memo1.Lines.Add('Pinging ' + Edit1.text);

Endereco := @Host.h_addr_list;

HNDFile := IcmpCreateFile();
for x:= 0 to 4 do begin
Ip.Ttl := char(255);
Ip.Tos := char(0);
Ip.IPFlags := char(0);
Ip.OptSize := char(0);
Ip.Options := nil;

dwRetorno := IcmpSendEcho(
HNDFile,
Endereco^,
null,
0,
Ip,
Icmp,
sizeof(Icmp),
DWORD(5000));
Destino.S_addr := icmp.source;
Memo1.Lines.Add('Ping ' + Edit1.text);
end;


IcmpCLoseHandle(HNDFile);
FreeLibrary(HNDicmp);
WSACleanup();
end;

end.