Delphi用Socket API隐藏自己的真实IP

 

下面是利用RAW Socket自己管理IP头和UDP头的例子，UDP隐藏自己的IP很容易，但是TCP就难了，因为必须和远程主机建立连接，假的IP地址怎么建立连接呢？？？ ...

 

interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, Winsock2, YRecords;type TForm1 = class(TForm) Button1: TButton; edtDestIP: TEdit; edtFromIP: TEdit; edtDestPort: TEdit; edtFromPort: TEdit; ListBox1: TListBox; procedure FormCreate(Sender: TObject); procedure FormClose(Sender: TObject; var Action: TCloseAction); procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end;var Form1: TForm1;implementation{$R *.dfm}function CheckSum( p: PU16; size: U16 ):U16;var chksum : U32; pbuf : PU16;begin pbuf := p; chksum := 0; while size > 1 do begin chksum := chksum + pbuf^; Inc( pBuf ); Dec( size, sizeof(U16) ); end; if Size=1 then ChkSum := ChkSum + PByte(pBuf)^; chksum := (chksum shr 16 )+(chksum and $ffff); chksum := chksum + (chksum shr 16); chksum := not chksum; result := U16(chksum);end;//填充IP Headerprocedure FillIPHeader( pip: PIPHeader; ttl:u8; datalen: u32; proto: U8; destip, fromip: U32 );var b : u8; w : u16;begin b := 4; pip^.u8verlen := ( b shl 4 ) or (sizeof(YIPHeader) div sizeof(u32)); pip^.u8tos := 0; w := u16( sizeof(YIPHeader) + sizeof(YUDPHeader) + datalen ); pip^.u16totallen := htons( w ); pip^.u16id := u16(GetCurrentProcessID); pip^.u16offset := htons(1 shl 14);//do not fragment pip^.u8ttl := ttl; pip^.u8protol := proto; pip^.u16checksum := 0; pip^.u32srcaddr := fromip; pip^.u32destaddr := destip; pip^.u16checksum := CheckSum( PU16(pip), sizeof(YIPHeader) );end;//填充UDP头procedure FillUDPHeader( pudp: PUDPHeader; datalen: u32; destport, fromport: U32 );var b : u8; w : u16;begin pudp^.u16srcport := fromport; pudp^.u16destport := destport; pudp^.u16len := htons( sizeof(YUDPHeader) + datalen ); pudp^.u16chksum := 0;end;procedure ErrMsg( msg: string );begin MessageBox( 0, PChar(msg), ’Ping Program Error’, MB_ICONERROR );end;procedure TForm1.FormCreate(Sender: TObject);var wsa : TWSAData;begin if WSAStartup( $0202, wsa ) <> 0 then ErrMsg( ’Windows socket is not responed.’ );end;procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);begin if WSACleanup <> 0 then ErrMsg( ’Windows socket can not be closed.’ );end;procedure TForm1.Button1Click(Sender: TObject);var udpsock : TSocket; opt : s32; DestAdr, FromAdr : TSockAddr; pIPHdr : PIPHeader; pUDPHdr : PUDPHeader; pDataBuf : PChar;begin //创建一个UDPSOCK发送探测包 udpsock := socket( AF_INET, SOCK_RAW, IPPROTO_UDP ); //设置SOCKET选项--我们自己操作IP头 opt := 1; setsockopt( udpsock, IPPROTO_IP, IP_HDRINCL, @opt, SizeOf(opt)); //为IP Header / UDP header /Data buf 分配内存 pIPHdr := AllocMem( sizeof(YIPHeader) + sizeof(YUDPHeader) + PACKET_SIZE ); pUDPHdr := PUDPHeader( PChar(pIPHdr) + sizeof(YIPHeader) ); pDataBuf := PChar(pUDPHdr) + sizeof(YUDPHeader); //本地Addr FillChar( FromAdr, sizeof(FromAdr), 0 ); FromAdr.sin_family := AF_INET; FromAdr.sin_port := htons( StrToInt(edtFromPort.text) ); FromAdr.sin_addr.S_addr := inet_addr( PChar(edtFromIP.Text) ); //远程Addr FillChar( DestAdr, sizeof(DestAdr), 0 ); DestAdr.sin_family := AF_INET; DestAdr.sin_port := htons( StrToInt(edtDestPort.text) ); DestAdr.sin_addr.S_addr := inet_addr( PChar(edtDestIP.Text) ); //填充IP头和UDP头 FillIPHeader( pIPHdr, 55, PACKET_SIZE, IPPROTO_UDP, DestAdr.sin_addr.S_addr, FromAdr.sin_addr.S_addr ); FillUDPHeader( pUDPHdr, PACKET_SIZE, DestAdr.sin_port, FromAdr.sin_port ); FillChar( pDataBuf^, PACKET_SIZE, ’Y’ ); //发送UDP包到HOST sendto( udpsock, pIPHdr^, sizeof(YIPHeader) + sizeof(YUDPHeader) + PACKET_SIZE, 0, DestAdr, sizeof(DestAdr) ); ListBox1.Items.Add( ’发送了’ +IntToStr(ret)+ ’字节到：’ + edtDestIP.Text ); closesocket(udpsock); FreeMem( pIPHdr );end;end.