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.

unit icmp;
interface
uses windows;
Const
// IP_STATUS codes returned from IP APIs

IP_STATUS_BASE = 11000;
IP_SUCCESS = 0;
IP_BUF_TOO_SMALL = (IP_STATUS_BASE + 1);
IP_DEST_NET_UNREACHABLE = (IP_STATUS_BASE + 2);
IP_DEST_HOST_UNREACHABLE = (IP_STATUS_BASE + 3);
IP_DEST_PROT_UNREACHABLE = (IP_STATUS_BASE + 4);
IP_DEST_PORT_UNREACHABLE = (IP_STATUS_BASE + 5);
IP_NO_RESOURCES = (IP_STATUS_BASE + 6);
IP_BAD_OPTION = (IP_STATUS_BASE + 7);
IP_HW_ERROR = (IP_STATUS_BASE + 8);
IP_PACKET_TOO_BIG = (IP_STATUS_BASE + 9);
IP_REQ_TIMED_OUT = (IP_STATUS_BASE + 10);
IP_BAD_REQ = (IP_STATUS_BASE + 11);
IP_BAD_ROUTE = (IP_STATUS_BASE + 12);
IP_TTL_EXPIRED_TRANSIT = (IP_STATUS_BASE + 13);
IP_TTL_EXPIRED_REASSEM = (IP_STATUS_BASE + 14);
IP_PARAM_PROBLEM = (IP_STATUS_BASE + 15);
IP_SOURCE_QUENCH = (IP_STATUS_BASE + 16);
IP_OPTION_TOO_BIG = (IP_STATUS_BASE + 17);
IP_BAD_DESTINATION = (IP_STATUS_BASE + 18);

// The next group are status codes passed up on status indications to
// transport layer protocols.
IP_ADDR_DELETED = (IP_STATUS_BASE + 19);
IP_SPEC_MTU_CHANGE = (IP_STATUS_BASE + 20);
IP_MTU_CHANGE = (IP_STATUS_BASE + 21);
IP_UNLOAD = (IP_STATUS_BASE + 22);
IP_GENERAL_FAILURE = (IP_STATUS_BASE + 50);
MAX_IP_STATUS = IP_GENERAL_FAILURE;
IP_PENDING = (IP_STATUS_BASE + 255);

// Values used in the IP header Flags field.
IP_FLAG_DF = $2; // Don't fragment this packet.

// Supported IP Option Types.
// These types define the options which may be used in the OptionsData field
// of the ip_option_information structure. See RFC 791 for a complete
// description of each.
IP_OPT_EOL = 0; // End of list option
IP_OPT_NOP = 1; // No operation
IP_OPT_SECURITY = $82; // Security option
IP_OPT_LSRR = $83; // Loose source route
IP_OPT_SSRR = $89; // Strict source route
IP_OPT_RR = $7; // Record route
IP_OPT_TS = $44; // Timestamp
IP_OPT_SID = $88; // Stream ID (obsolete)

MAX_OPT_SIZE = 40; // Maximum length of IP options in bytes

Type

TIPAddr=integer; // An IP address.
TIPMask=integer; // An IP subnet mask.
TIP_STATUS=Integer; // Status code returned from IP APIs.

POption_Information=^TOption_Information;
TOption_Information=record
Ttl:byte; // Time To Live
Tos:byte; // Type Of Service
Flags:byte; // IP header flags
OptionsSize:byte; // Size in bytes of options data
OptionsData:pointer; // Pointer to options data
end;
Picmp_echo_reply=^Ticmp_echo_reply;
Ticmp_echo_reply=record
Address:TipAddr; // Replying address
Status:integer; // Reply IP_STATUS
RoundTripTime:integer; // RTT in milliseconds
DataSize:word; // Reply data size in bytes
Reserved:word; // Reserved for system use
Data:pointer; // Pointer to the reply data
Options:Toption_Information; // Reply options
end;
TsmICMP_Echo_Reply=record
Address:TipAddr; // Replying address
Status:integer; // Reply IP_STATUS
RoundTripTime:integer; // RTT in milliseconds
DataSize:word; // Reply data size in bytes
Reserved:word; // Reserved for system use
DataPtr:pointer; // Pointer to the reply data
Options:Toption_Information; // Reply options
Data: array [0..255] of Char;
end;

function IcmpCreateFile:Thandle; StdCall;
function IcmpCloseHandle (H:Thandle):Bool; StdCall;
function IcmpSendEcho (IcmpHandle:Thandle;DestinationAddress:TipAddr;
RequestData:pointer;RequestSize:word;
RequestOptions:POption_Information;ReplyBuffer:pointer;
ReplySize:integer;Timeout:integer):Integer; stdcall;
Implementation
function IcmpCreateFile; external 'Icmp.Dll';
function IcmpCloseHandle; external 'Icmp.Dll';
Function IcmpSendEcho; external 'Icmp.Dll';
end.

uses icmp, pingModule