Сетевое железо - статьи



         

Листинг 2. Процедура "пинга"


unit pingModule;
interface
uses icmp, Windows;
const
INADDR_NONE: integer = -1;
procedure Ping (const Address, EchoString: PChar;var PingReply: TsmICMP_Echo_Reply;
const PingTimeout: Integer = 500);
function PingStatusToStr (StatusCode: integer): string;
function inet_addr (IPAddress: PChar): TipAddr; StdCall;
implementation
uses Dialogs, SysUtils;
procedure Ping (const Address, EchoString: PChar;
var PingReply: TsmICMP_Echo_Reply;
const PingTimeout: Integer = 500);
var
IPAddress: TipAddr;
ICMPPort: THandle;
begin
IPAddress:= inet_addr (Address);
if (IPAddress = INADDR_NONE) then
begin
raise Exception.Create ('Function call inet_addr failed. ' +
'The IP address is probably invalid.');
end;
ICMPPort:= IcmpCreateFile ();
if (ICMPPort = INVALID_HANDLE_VALUE) then
begin
raise Exception.Create ('Function call IcmpCreateFile failed.');
end;
IcmpSendEcho (ICMPPort, IPAddress,
EchoString, Length (EchoString), nil,
@PingReply, SizeOf (PingReply), PingTimeout);
IcmpCloseHandle (ICMPPort);
end;

function PingStatusToStr (StatusCode: integer): string;
begin
case (StatusCode) of
IP_SUCCESS: Result:= 'IP_SUCCESS';
IP_BUF_TOO_SMALL: Result:= 'IP_BUF_TOO_SMALL';
IP_DEST_NET_UNREACHABLE: Result:= 'IP_DEST_NET_UNREACHABLE';
IP_DEST_HOST_UNREACHABLE: Result:= 'IP_DEST_HOST_UNREACHABLE';
IP_DEST_PROT_UNREACHABLE: Result:= 'IP_DEST_PROT_UNREACHABLE';
IP_DEST_PORT_UNREACHABLE: Result:= 'IP_DEST_PORT_UNREACHABLE';
IP_NO_RESOURCES: Result:= 'IP_NO_RESOURCES';
IP_BAD_OPTION: Result:= 'IP_BAD_OPTION';
IP_HW_ERROR: Result:= 'IP_HW_ERROR';
IP_PACKET_TOO_BIG: Result:= 'IP_PACKET_TOO_BIG';
IP_REQ_TIMED_OUT: Result:= 'IP_REQ_TIMED_OUT';
IP_BAD_REQ: Result:= 'IP_BAD_REQ';
IP_BAD_ROUTE: Result:= 'IP_BAD_ROUTE';
IP_TTL_EXPIRED_TRANSIT: Result:= 'IP_TTL_EXPIRED_TRANSIT';
IP_TTL_EXPIRED_REASSEM: Result:= 'IP_TTL_EXPIRED_REASSEM';
IP_PARAM_PROBLEM: Result:= 'IP_PARAM_PROBLEM';
IP_SOURCE_QUENCH: Result:= 'IP_SOURCE_QUENCH';
IP_OPTION_TOO_BIG: Result:= 'IP_OPTION_TOO_BIG';
IP_BAD_DESTINATION: Result:= 'IP_BAD_DESTINATION';
IP_ADDR_DELETED: Result:= 'IP_ADDR_DELETED';
IP_SPEC_MTU_CHANGE: Result:= 'IP_SPEC_MTU_CHANGE';
IP_MTU_CHANGE: Result:= 'IP_MTU_CHANGE';
IP_UNLOAD: Result:= 'IP_UNLOAD';
IP_GENERAL_FAILURE: Result:= 'IP_GENERAL_FAILURE';
else
Result:= '';
end;
end;


function inet_addr; external 'WSock32.Dll';

end.




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