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{
1. ������ֻ�������� Window 2000.
2. ������� Administrator Ȩ��.
3. ������Ҫ�õ�һ�� button ��һ�� memo.
----------------------------------------------------------------------
���г���ǰ�������Լ�����Ҫ�ı� SrcIP��SrcPort��DestIP��DestPort��ֵ
----------------------------------------------------------------------
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----------------------------------------------------------------------
}
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, OleCtrls, Registry;
Const
SrcIP = '123.123.123.1';//���ͷ�IP��ַ
SrcPort = 1234;         file://���ͷ��˿�
DestIP = '127.0.0.2';   file://Ŀ��IP��ַ
DestPort = 4321;        file://Ŀ�Ķ˿�
Max_Message = 4068;
Max_Packet = 4096;
type
TPacketBuffer = Array[0..Max_Packet-1] of byte;
TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
procedure SendIt;
end;
// IP ͷ
type
T_IP_Header = record
ip_verlen : Byte;
ip_tos : Byte;
ip_totallength : Word;
ip_id : Word;
ip_offset : Word;
ip_ttl : Byte;
ip_protocol : Byte;
ip_checksum : Word;
ip_srcaddr : LongWord;
ip_destaddr : LongWord;
end;
// UDP ͷ
Type
T_UDP_Header = record
src_portno : Word;
dst_portno : Word;
udp_length : Word;
udp_checksum : Word;
end;
// һЩ Winsock 2 ����������
u_char = Char;
u_short = Word;
u_int = Integer;
u_long = Longint;
SunB = packed record
s_b1, s_b2, s_b3, s_b4: u_char;
end;
SunW = packed record
s_w1, s_w2: u_short;
end;
in_addr = record
case integer of
0: (S_un_b: SunB);
1: (S_un_w: SunW);
2: (S_addr: u_long);
end;
TInAddr = in_addr;
Sockaddr_in = record
case Integer of
0: (sin_family: u_short;
sin_port: u_short;
sin_addr: TInAddr;
sin_zero: array[0..7] of Char);
1: (sa_family: u_short;
sa_data: array[0..13] of Char)
end;
TSockAddr = Sockaddr_in;
TSocket = u_int;
const
WSADESCRIPTION_LEN = 256;
WSASYS_STATUS_LEN = 128;
type
PWSAData = ^TWSAData;
WSAData = record //  WSDATA
wVersion: Word;
wHighVersion: Word;
szDescription: array[0..WSADESCRIPTION_LEN] of Char;
szSystemStatus: array[0..WSASYS_STATUS_LEN] of Char;
iMaxSockets: Word;
iMaxUdpDg: Word;
lpVendorInfo: PChar;
end;
TWSAData = WSAData;
file://����һЩ winsock 2 ����
function closesocket(s: TSocket): Integer; stdcall;
function socket(af, Struct, protocol: Integer): TSocket; stdcall;
function sendto(s: TSocket; var Buf; len, flags: Integer; var addrto: TSockA
ddr;
tolen: Integer): Integer; stdcall;{}
function setsockopt(s: TSocket; level, optname: Integer; optval: PChar;
optlen: Integer): Integer; stdcall;
function inet_addr(cp: PChar): u_long; stdcall; {PInAddr;} { TInAddr }
function htons(hostshort: u_short): u_short; stdcall;
function WSAGetLastError: Integer; stdcall;
function WSAStartup(wVersionRequired: word; var WSData: TWSAData): Integer; 
stdcall;
function WSACleanup: Integer; stdcall;
const
AF_INET = 2; // internetwork: UDP, TCP, etc.
IP_HDRINCL = 2; // IP Header Include
SOCK_RAW = 3; // raw-protocol interface
IPPROTO_IP = 0; // dummy for IP
IPPROTO_TCP = 6; // tcp
IPPROTO_UDP = 17; // user datagram protocol
IPPROTO_RAW = 255; // raw IP packet
INVALID_SOCKET = TSocket(NOT(0));
SOCKET_ERROR = -1;
var
Form1: TForm1;
implementation
// Import Winsock 2 functions
const WinSocket = 'WS2_32.DLL';
function closesocket; external winsocket name 'closesocket';
function socket; external winsocket name 'socket';
function sendto; external winsocket name 'sendto';
function setsockopt; external winsocket name 'setsockopt';
function inet_addr; external winsocket name 'inet_addr';
function htons; external winsocket name 'htons';
function WSAGetLastError; external winsocket name 'WSAGetLastError';
function WSAStartup; external winsocket name 'WSAStartup';
function WSACleanup; external winsocket name 'WSACleanup';
{$R *.DFM}
function CheckSum(Var Buffer; Size : integer) : Word;
type
TWordArray = Array[0..1] of Word;
var
ChkSum : LongWord;
i : Integer;
begin
ChkSum := 0;
i := 0;
While Size > 1 do begin
ChkSum := ChkSum + TWordArray(Buffer);
inc(i);
Size := Size - SizeOf(Word);
end;
if Size=1 then ChkSum := ChkSum + Byte(TWordArray(Buffer));
ChkSum := (ChkSum shr 16) + (ChkSum and $FFFF);
ChkSum := ChkSum + (Chksum shr 16);
Result := Word(ChkSum);
end;
procedure BuildHeaders(
FromIP : String;
iFromPort : Word;
ToIP : String;
iToPort : Word;
StrMessage : String;
Var Buf : TPacketBuffer;
Var remote : TSockAddr;
Var iTotalSize : Word
);
Var
dwFromIP : LongWord;
dwToIP : LongWord;
iIPVersion : Word;
iIPSize : Word;
ipHdr : T_IP_Header;
udpHdr : T_UDP_Header;
iUdpSize : Word;
iUdpChecksumSize : Word;
cksum : Word;
Ptr : ^Byte;
procedure IncPtr(Value : Integer);
begin
ptr := pointer(integer(ptr) + Value);
end;
begin
// Convert ip address'ss
dwFromIP := inet_Addr(PChar(FromIP));
dwToIP := inet_Addr(PChar(ToIP));
// ��ʼ�� IP ͷ
//
iTotalSize := sizeof(ipHdr) + sizeof(udpHdr) + length(strMessage);
iIPVersion := 4;
iIPSize := sizeof(ipHdr) div sizeof(LongWord);
ipHdr.ip_verlen := (iIPVersion shl 4) or iIPSize;
ipHdr.ip_tos := 0; // IP type of service
ipHdr.ip_totallength := htons(iTotalSize); // Total packet len
ipHdr.ip_id := 0; // Unique identifier: set to 0
ipHdr.ip_offset := 0; // Fragment offset field
ipHdr.ip_ttl := 128; // Time to live
ipHdr.ip_protocol := $11; // Protocol(UDP)
ipHdr.ip_checksum := 0 ; // IP checksum
ipHdr.ip_srcaddr := dwFromIP; // Source address
ipHdr.ip_destaddr := dwToIP; // Destination address
//
// ��ʼ�� UDP ͷ
//
iUdpSize := sizeof(udpHdr) + length(strMessage);
udpHdr.src_portno := htons(iFromPort) ;
udpHdr.dst_portno := htons(iToPort) ;
udpHdr.udp_length := htons(iUdpSize) ;
udpHdr.udp_checksum := 0 ;
iUdpChecksumSize := 0;
ptr := @buf[0];
FillChar(Buf, SizeOf(Buf), 0);
Move(ipHdr.ip_srcaddr, ptr^, SizeOf(ipHdr.ip_srcaddr));
IncPtr(SizeOf(ipHdr.ip_srcaddr));
iUdpChecksumSize := iUdpChecksumSize + sizeof(ipHdr.ip_srcaddr);
Move(ipHdr.ip_destaddr, ptr^, SizeOf(ipHdr.ip_destaddr));
IncPtr(SizeOf(ipHdr.ip_destaddr));
iUdpChecksumSize := iUdpChecksumSize + sizeof(ipHdr.ip_destaddr);
IncPtr(1);
Inc(iUdpChecksumSize);
Move(ipHdr.ip_protocol, ptr^, sizeof(ipHdr.ip_protocol));
IncPtr(sizeof(ipHdr.ip_protocol));
iUdpChecksumSize := iUdpChecksumSize + sizeof(ipHdr.ip_protocol);
Move(udpHdr.udp_length, ptr^, sizeof(udpHdr.udp_length));
IncPtr(sizeof(udpHdr.udp_length));
iUdpChecksumSize := iUdpChecksumSize + sizeof(udpHdr.udp_length);
move(udpHdr, ptr^, sizeof(udpHdr));
IncPtr(sizeof(udpHdr));
iUdpChecksumSize := iUdpCheckSumSize + sizeof(udpHdr);
Move(StrMessage[1], ptr^, Length(strMessage));
IncPtr(Length(StrMessage));
iUdpChecksumSize := iUdpChecksumSize + length(strMessage);
cksum := checksum(buf, iUdpChecksumSize);
udpHdr.udp_checksum := cksum;
//
// ���� IP �� UDP ͷOK�ˣ����ǿ��԰����ͳ�ȥ��
//
FillChar(Buf, SizeOf(Buf), 0);
Ptr := @Buf[0];
Move(ipHdr, ptr^, SizeOf(ipHdr)); IncPtr(SizeOf(ipHdr));
Move(udpHdr, ptr^, SizeOf(udpHdr)); IncPtr(SizeOf(udpHdr));
Move(StrMessage[1], ptr^, length(StrMessage));
remote.sin_family := AF_INET;
remote.sin_port := htons(iToPort);
remote.sin_addr.s_addr := dwToIP;
end;
procedure TForm1.SendIt;
Var
sh : TSocket;
bOpt : Integer;
ret : Integer;
Buf : TPacketBuffer;
Remote : TSockAddr;
Local : TSockAddr;
iTotalSize : Word;
wsdata : TWSAdata;
begin
// Startup Winsock 2
ret := WSAStartup($0002, wsdata);
if ret<>0 then begin
memo1.lines.add('WSA Startup failed.');
exit;
end;
with memo1.lines do begin
add('WSA Startup:');
add('Desc.: '+wsData.szDescription);
add('Status: '+wsData.szSystemStatus);
end;
try
// Create socket
sh := Socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
if (sh = INVALID_SOCKET) then begin
memo1.lines.add('Socket() failed: '+IntToStr(WSAGetLastError));
exit;
end;
Memo1.lines.add('Socket Handle = '+IntToStr(sh));
// Option: Header Include
bOpt := 1;
ret := SetSockOpt(sh, IPPROTO_IP, IP_HDRINCL, @bOpt, SizeOf(bOpt));
if ret = SOCKET_ERROR then begin
Memo1.lines.add('setsockopt(IP_HDRINCL) failed: '+IntToStr(WSAGetLastError))
;
exit;
end;
// Build the packet
BuildHeaders( SrcIP, SrcPort,
DestIP, DestPort,
'THIS IS A TEST PACKET',
Buf, Remote, iTotalSize );
// Send the packet
ret := SendTo(sh, buf, iTotalSize, 0, Remote, SizeOf(Remote));
if ret = SOCKET_ERROR then
Memo1.Lines.Add('sendto() failed: '+IntToStr(WSAGetLastError))
else
Memo1.Lines.Add('send '+IntToStr(ret)+' bytes.');
// Close socket
CloseSocket(sh);
finally
// Close Winsock 2
WSACleanup;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
SendIt;
end;
end.

--

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