那位帮我瞧一下,错在那儿,我估计是在计算tcp头的长度和校验时有问题.源码如下:
unit senddata;
interfaceuses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, OleCtrls, Registry;Const
SrcIP = '202.108.249.138';//发送方IP地址
SrcPort = 3033; //发送方端口
DestIP = '202.108.147.001'; //目的IP地址
DestPort = 80; //目的端口SEQ=0;
Max_Message = 4068;
Max_Packet = 4096;
typeTPacketBuffer = Array[0..Max_Packet-1] of byte;TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
Memo2: TMemo;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
procedure SendIt;
end;// IP 头
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 头
//tcp头
type t_tcp_header=record //定义TCP首部
TCP_Sport :word; //16位源端口
TCP_Dport :word; //16位目的端口
th_seq :longword; //32位序列号
th_ack :longword; //32位确认号
th_lenres :byte; //4位首部长度/6位保留字
th_flag :char; //6位标志位
th_win :word; //16位窗口大小
th_sum :word; //16位校验和
th_urp :word; //16位紧急数据偏移量
end;
type tpsd_header=record
saddr:longword;//源地址
daddr:longword;//目的地址
mbz:char; //
ptcl:char;//协议类型
tcpl:word;//tcp长度
end;
// 一些 Winsock 2 的类型声明
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;
iMaxtcpDg: Word;
lpVendorInfo: PChar;
end;
TWSAData = WSAData;//定义一些 winsock 2 函数
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: TSockAddr;
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 htonl(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 IncludeSOCK_RAW = 3; // raw-protocol interfaceIPPROTO_IP = 0; // dummy for IP
IPPROTO_TCP = 6; // tcp
IPPROTO_UDP = 17; // user datagram protocol
IPPROTO_RAW = 255; // raw IP packetINVALID_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 htonl; external winsocket name 'htonl';
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)[i];
inc(i);
Size := Size - SizeOf(Word);
end;if Size=1 then ChkSum := ChkSum + Byte(TWordArray(Buffer)[i]);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;
senddata : pchar;
Var Buf : TPacketBuffer;
Var remote : TSockAddr;
Var iTotalSize : Word
);
VardwFromIP : LongWord;
dwToIP : LongWord;iIPVersion : Word;
iIPSize : Word;
ipHdr : T_IP_Header;
tcphdr:t_tcp_header;
psdhdr:tpsd_header;itcpSize : Word;
itcpChecksumSize : Word;
cksum : Word;Ptr : ^Byte;procedure IncPtr(Value : Integer);
begin
ptr := pointer(integer(ptr) + Value);
end;begin
// Convert ip address'ssdwFromIP := inet_Addr(PChar(FromIP));
dwToIP := inet_Addr(PChar(ToIP));// 初始化 IP 头
//
iTotalSize := sizeof(ipHdr) + sizeof(tcpHdr) + sizeof(senddata);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
// 初始化 tcp 头
tcphdr.TCP_Sport:=htons(SrcPort);
tcphdr.TCP_Dport:=htons(DestPort);
tcphdr.th_seq:=htonl(SEQ);
tcphdr.th_ack:=0;
tcphdr.th_lenres:=sizeof(tcphdr)+sizeof(senddata);
tcphdr.th_flag:='2';
tcphdr.th_win:=htons(16384);
tcphdr.th_urp:=0;
tcphdr.th_sum:=0;
unit senddata;
interfaceuses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, OleCtrls, Registry;Const
SrcIP = '202.108.249.138';//发送方IP地址
SrcPort = 3033; //发送方端口
DestIP = '202.108.147.001'; //目的IP地址
DestPort = 80; //目的端口SEQ=0;
Max_Message = 4068;
Max_Packet = 4096;
typeTPacketBuffer = Array[0..Max_Packet-1] of byte;TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
Memo2: TMemo;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
procedure SendIt;
end;// IP 头
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 头
//tcp头
type t_tcp_header=record //定义TCP首部
TCP_Sport :word; //16位源端口
TCP_Dport :word; //16位目的端口
th_seq :longword; //32位序列号
th_ack :longword; //32位确认号
th_lenres :byte; //4位首部长度/6位保留字
th_flag :char; //6位标志位
th_win :word; //16位窗口大小
th_sum :word; //16位校验和
th_urp :word; //16位紧急数据偏移量
end;
type tpsd_header=record
saddr:longword;//源地址
daddr:longword;//目的地址
mbz:char; //
ptcl:char;//协议类型
tcpl:word;//tcp长度
end;
// 一些 Winsock 2 的类型声明
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;
iMaxtcpDg: Word;
lpVendorInfo: PChar;
end;
TWSAData = WSAData;//定义一些 winsock 2 函数
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: TSockAddr;
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 htonl(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 IncludeSOCK_RAW = 3; // raw-protocol interfaceIPPROTO_IP = 0; // dummy for IP
IPPROTO_TCP = 6; // tcp
IPPROTO_UDP = 17; // user datagram protocol
IPPROTO_RAW = 255; // raw IP packetINVALID_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 htonl; external winsocket name 'htonl';
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)[i];
inc(i);
Size := Size - SizeOf(Word);
end;if Size=1 then ChkSum := ChkSum + Byte(TWordArray(Buffer)[i]);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;
senddata : pchar;
Var Buf : TPacketBuffer;
Var remote : TSockAddr;
Var iTotalSize : Word
);
VardwFromIP : LongWord;
dwToIP : LongWord;iIPVersion : Word;
iIPSize : Word;
ipHdr : T_IP_Header;
tcphdr:t_tcp_header;
psdhdr:tpsd_header;itcpSize : Word;
itcpChecksumSize : Word;
cksum : Word;Ptr : ^Byte;procedure IncPtr(Value : Integer);
begin
ptr := pointer(integer(ptr) + Value);
end;begin
// Convert ip address'ssdwFromIP := inet_Addr(PChar(FromIP));
dwToIP := inet_Addr(PChar(ToIP));// 初始化 IP 头
//
iTotalSize := sizeof(ipHdr) + sizeof(tcpHdr) + sizeof(senddata);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
// 初始化 tcp 头
tcphdr.TCP_Sport:=htons(SrcPort);
tcphdr.TCP_Dport:=htons(DestPort);
tcphdr.th_seq:=htonl(SEQ);
tcphdr.th_ack:=0;
tcphdr.th_lenres:=sizeof(tcphdr)+sizeof(senddata);
tcphdr.th_flag:='2';
tcphdr.th_win:=htons(16384);
tcphdr.th_urp:=0;
tcphdr.th_sum:=0;
//填充tcp伪首部(用于计算校验和,并不真正发送)
psdhdr.saddr:=iphdr.ip_srcaddr;
psdhdr.daddr:=iphdr.ip_destaddr;
psdhdr.mbz:=char(0);
psdhdr.ptcl:=char(IPPROTO_TCP);
psdhdr.tcpl:=htons(sizeof(tcphdr));
//计算tcp校验和,计算校验和时需要包括tcp pseudo header
itcpSize := sizeof(tcpHdr) + sizeof(senddata);
{udpHdr.src_portno := htons(iFromPort) ;
udpHdr.dst_portno := htons(iToPort) ;
udpHdr.udp_length := htons(iUdpSize) ;
udpHdr.udp_checksum := 0 ;
}
itcpChecksumSize := 0;ptr := @buf[0];
FillChar(Buf, SizeOf(Buf), 0);Move(ipHdr.ip_srcaddr, ptr^, SizeOf(ipHdr.ip_srcaddr));
IncPtr(SizeOf(ipHdr.ip_srcaddr));itcpChecksumSize := itcpChecksumSize + sizeof(ipHdr.ip_srcaddr);Move(ipHdr.ip_destaddr, ptr^, SizeOf(ipHdr.ip_destaddr));
IncPtr(SizeOf(ipHdr.ip_destaddr));itcpChecksumSize := itcpChecksumSize + sizeof(ipHdr.ip_destaddr);IncPtr(1);Inc(itcpChecksumSize);Move(ipHdr.ip_protocol, ptr^, sizeof(ipHdr.ip_protocol));
IncPtr(sizeof(ipHdr.ip_protocol));
itcpChecksumSize := itcpChecksumSize + sizeof(ipHdr.ip_protocol);
Move(itcpSize, ptr^, sizeof(itcpSize));
IncPtr(sizeof(itcpSize));
itcpChecksumSize := itcpChecksumSize + sizeof(itcpSize);move(tcphdr, ptr^, sizeof(tcphdr));
IncPtr(sizeof(tcphdr));
itcpChecksumSize := itcpCheckSumSize + sizeof(tcpHdr);Move(senddata[1], ptr^, sizeof(senddata));
IncPtr(sizeof(senddata));itcpChecksumSize := itcpChecksumSize + length(senddata);cksum := checksum(buf, itcpChecksumSize);
tcpHdr.th_sum:= cksum;//
// 现在 IP 和 tcp 头OK了,我们可以把它发送出去。
//
FillChar(Buf, SizeOf(Buf), 0);
Ptr := @Buf[0];Move(ipHdr, ptr^, SizeOf(ipHdr)); IncPtr(SizeOf(ipHdr));
Move(tcpHdr, ptr^, SizeOf(tcpHdr)); IncPtr(SizeOf(tcpHdr));
Move(senddata[1], ptr^, sizeof(senddata));
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;
str:widestring;
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_TCP);
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;
memo2.Lines.LoadFromFile('1.txt');
// Build the packet
BuildHeaders( SrcIP, SrcPort,
DestIP, DestPort,
pchar(memo2.text),
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.