Re: Re: Не работает редирект

Home Forums Discussions Support Не работает редирект Re: Re: Не работает редирект

#7043
SergeySW
Participant

    Переделал тестовый вариант так как вы советовали. Не заработало 🙁
    Тестирую у себя локально на компе. По http запрашиваю адрес 10.10.10.17

    {$APPTYPE CONSOLE}

    uses
    SysUtils,
    Windows,
    Winsock,
    winpkf,
    iphlp;

    var
    iIndex : DWORD;
    hFilt : THANDLE;
    Adapts : TCP_AdapterList;
    AdapterMode : ADAPTER_MODE;
    Buffer : INTERMEDIATE_BUFFER;
    ReadRequest : ETH_REQUEST;
    hEvent : THANDLE;
    hAdapter : THANDLE;
    pEtherHeader : TEtherHeaderPtr;
    pIPHeader : TIPHeaderPtr;
    pTcpHeader : TTCPHeaderPtr;
    aaLen, testSum : dword;
    RecalcChecksum : boolean;


    function IPAddrToName(IPAddr : string) : string;
    var
    SockAddrIn : TSockAddrIn;
    HostEnt : PHostEnt;
    WSAData : TWSAData;
    begin
    WSAStartup($101, WSAData);
    SockAddrIn.sin_addr.s_addr := inet_addr(PChar(IPAddr));
    HostEnt := gethostbyaddr(@SockAddrIn.sin_addr.S_addr, 4, AF_INET);
    if HostEnt <> nil then
    begin
    result := StrPas(Hostent^.h_name)
    end
    else
    begin
    result := '';
    end;
    end;


    // Calculate TCP checkcum
    function RecalculateTCPChecksum(aLen: Integer; aSrcAddr, aDstAddr: Cardinal; buff: PByteArray): Word;
    var
    w16,padd: word;
    i,sum: ulong;
    sIP,dIP: in_addr;
    begin
    padd := 0;
    sum := 0;
    if (aLen div 2) * 2 <> aLen then begin
    padd := 1;
    buff[aLen] := 0;
    end;
    i := 0;
    while i < aLen+padd do begin
    w16 := ((buff shl 8)and $FF00) + (buff[i+1]and $FF);
    sum := sum + dword(w16);
    i := i + 2;
    end;

    //add IP length
    sIP := in_addr(aSrcAddr);
    dIP := in_addr(aDstAddr);
    sum := sum + ntohs(sIP.S_un_w.s_w1) + ntohs(sIP.S_un_w.s_w2);
    sum := sum + ntohs(dIP.S_un_w.s_w1) + ntohs(dIP.S_un_w.s_w2);
    sum := sum + IPPROTO_TCP + word(aLen);

    while (sum shr 16)>0 do
    sum := (sum and $FFFF)+(sum shr 16);

    sum := not sum;
    sum := htons(sum);
    Result := sum;
    end;

    function Checksum(p: PWORD; Size: word): WORD;
    var
    i: Integer;
    Sum: DWORD;
    begin
    Sum := 0;
    for i := 0 to Size - 1 do
    begin
    Sum := Sum + ntohs(p^);
    inc(p);
    end;
    while (Sum shr 16) > 0 do
    Sum := (Sum and $FFFF) + (Sum shr 16);
    Sum := not Sum;
    Result := Sum;
    end;


    procedure ReleaseInterface();
    begin
    // Restore default mode
    AdapterMode.dwFlags := 0;
    AdapterMode.hAdapterHandle := hAdapter;
    SetAdapterMode(hFilt, @AdapterMode);

    // Set NULL event to release previously set event object
    SetPacketEvent(hFilt, hAdapter, 0);

    // Close Event
    if hEvent <> 0 then
    CloseHandle(hEvent);

    // Close driver object
    CloseFilterDriver(hFilt);

    // Release NDISAPI
    FreeNDISAPI();
    end;

    begin

    // Check the number of parameters
    if ParamCount() < 2 then
    begin
    Writeln('Command line syntax:');
    Writeln(' PassThru.exe index num');
    Writeln(' index - network interface index.');
    Writeln(' num - number or packets to filter');
    Writeln('You can use ListAdapters to determine correct index.');
    // Exit;
    end;

    // Initialize NDISAPI
    InitNDISAPI();

    // Create driver object
    hFilt := OpenFilterDriver('NDISRD');

    if IsDriverLoaded(hFilt) then
    begin

    // Get parameters from command line
    //iIndex := StrToInt(ParamStr(1));
    //counter := StrToInt(ParamStr(2));
    iIndex := 2;

    // Set exit procedure
    ExitProcessProc := ReleaseInterface;

    // Get TCP/IP bound interfaces
    GetTcpipBoundAdaptersInfo(hFilt, @Adapts);

    // Check paramer values
    if iIndex > Adapts.m_nAdapterCount then
    begin
    Writeln('There is no network interface with such index on this system.');
    Exit;
    end;

    hAdapter := Adapts.m_nAdapterHandle[iIndex];

    AdapterMode.dwFlags := MSTCP_FLAG_SENT_TUNNEL or MSTCP_FLAG_RECV_TUNNEL ;
    AdapterMode.hAdapterHandle := hAdapter;

    // Create notification event
    hEvent := CreateEvent(nil, TRUE, FALSE, nil);

    if hEvent <> 0 then
    if SetPacketEvent(hFilt, hAdapter, hEvent) <> 0 then
    begin
    // Initialize request
    ReadRequest.EthPacket.Buffer := @Buffer;
    ReadRequest.hAdapterHandle := hAdapter;

    SetAdapterMode(hFilt, @AdapterMode);

    while true do
    begin
    WaitForSingleObject(hEvent, INFINITE);
    while ReadPacket(hFilt, @ReadRequest) <> 0 do
    begin
    pEtherHeader := TEtherHeaderPtr(@Buffer.m_IBuffer);

    if ntohs(pEtherHeader.h_proto) = ETH_P_IP then
    begin
    pIPHeader := TIPHeaderPtr(Dword(pEtherHeader)+SizeOf(TEtherHeader));
    if pIPHeader.Protocol = IPPROTO_TCP then
    begin
    RecalcChecksum:=false;
    pTcpHeader := TTCPHeaderPtr(Dword(pIPHeader)+(pIPHeader.VerLen and $F) * 4);

    if pIPHeader.DestIp=(inet_addr('10.10.10.17')) then
    begin
    RecalcChecksum:=true;
    pIPHeader.DestIp := (inet_addr('10.11.11.71'));
    end;

    if (pIPHeader.SourceIp=(inet_addr('10.11.11.71')))then
    begin
    RecalcChecksum:=true;
    pIPHeader.SourceIp := (inet_addr('10.10.10.17'));
    end;

    if RecalcChecksum then
    begin
    aaLen := ntohs(pIPHeader.TotalLen) - ((pIPHeader.VerLen and $F)*4);
    pTCPHeader.Checksum := 0;
    testSum := RecalculateTCPChecksum(aaLen, pIPHeader.SourceIp, pIPHeader.DestIp, PByteArray(pTCPHeader));
    pTCPHeader.Checksum := testSum;

    pIPHeader.Checksum := 00;
    pIPHeader.Checksum := htons(Checksum(Pword(pIPHeader), ((pIPHeader.VerLen and $F) * 4) div 2));
    end;
    end;
    end;

    // if ntohsn(pEtherHeader.h_proto) = ETH_P_RARP then
    // Writeln(' Reverse Addr Res packet');

    // if ntohsn(pEtherHeader.h_proto) = ETH_P_ARP then
    // Writeln(' Address Resolution packet');

    //Writeln('__');



    if Buffer.m_dwDeviceFlags = PACKET_FLAG_ON_SEND then
    // Place packet on the network interface
    SendPacketToAdapter(hFilt, @ReadRequest)
    else
    // Indicate packet to MSTCP
    SendPacketToMstcp(hFilt, @ReadRequest);
    end;
    ResetEvent(hEvent);
    end;
    end;
    end;
    end.