Vadim Smirnov

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Viewing 15 posts - 961 through 975 (of 1,486 total)
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  • in reply to: Packet Filter #6564
    Vadim Smirnov
    Keymaster

      SetHwPacketFilter выставляет аппаратный фильтр на сетевой карте, наиболее часто встречающийся пример это перевод сетевого интерфейса в promiscuous mode. То есть прямого отношения к фрагментированным пакетам эта ф-ция не имеет.

      Что значит “имеющимся функциями фильтрации, работать с фрагментированными пакетами” мне непонятно. С фрагментированными IP пакетами можно работать точно так же как и с любыми другими.

      in reply to: Packet Filter #6562
      Vadim Smirnov
      Keymaster

        WinpkFilter получает ethernet фреймы до TCP/IP стека (который осуществляет сборку фрагментов), поэтому если из сети приходят фрагментированные пакеты, то и winpkfilter покажет именно их, а не собранный IP пакет.

        Vadim Smirnov
        Keymaster

          What Visual Basic do you actually use? The samples were created for Visual Basic 6, so if you are using them under Visual Basic .NET then then the behavior can be different. An example managed memory can’t be directly passed to driver.

          in reply to: IRQ selection #6560
          Vadim Smirnov
          Keymaster

            For the legacy NT driver you could use HAL routines to reconfigure your device, for PnP driver you better stick with PnP manager. This paper should be of some help to understand the difference: http://www.hollistech.com/Resources/Misc%20art … usdata.doc

            in reply to: Order & Appearance of Virtnet in the XP Registry #6557
            Vadim Smirnov
            Keymaster

              What do excatly mean under “order”? I would not recommend to edit network configuration through the registry, however VirtNet can be found in the registry like any other network interface.

              in reply to: detect Sent or received message? #6546
              Vadim Smirnov
              Keymaster

                how works the winpkfilter, for setting up the SEND / Received message?

                If packet comes from the network it is marked as ON_RECEIVE and ON_SEND otherwise.

                and what do you think, how many packets are an overflow from the local mac if i capture theses by it

                Sorry, I don’t understand the question, could you clarify?

                in reply to: NeT Firewall 2.x Does Not Load Port Mapping on Startup #6556
                Vadim Smirnov
                Keymaster

                  2.x firewall service loaded only filters and adapter modes, new features like port mappings were not supported. It was fixed in 3.x

                  in reply to: Can directly send/recieve UDP Packets? #6552
                  Vadim Smirnov
                  Keymaster

                    Loading the following filter will force all UDP packets to pass without processing in user mode, all other packets will be redirected for processing to user mode.

                    // Common values
                    pFilters->m_StaticFilters[0].m_Adapter.QuadPart = 0; // applied to all adapters
                    pFilters->m_StaticFilters[0].m_ValidFields = NETWORK_LAYER_VALID;
                    pFilters->m_StaticFilters[0].m_FilterAction = FILTER_PACKET_PASS;
                    pFilters->m_StaticFilters[0].m_dwDirectionFlags = PACKET_FLAG_ON_SEND | PACKET_FLAG_ON_RECEIVE;

                    // Network layer filter
                    pFilters->m_StaticFilters[0].m_NetworkFilter.m_dwUnionSelector = IPV4;
                    pFilters->m_StaticFilters[0].m_NetworkFilter.m_IPv4.m_ValidFields = IP_V4_FILTER_PROTOCOL;
                    pFilters->m_StaticFilters[0].m_NetworkFilter.m_IPv4.m_Protocol = IPPROTO_UDP;

                    Refer “filter” sample for the general filters usage.

                    in reply to: Can directly send/recieve UDP Packets? #6550
                    Vadim Smirnov
                    Keymaster

                      Can UDP packets pass without entering winpk filter?

                      No, unless you have loaded a filter to pass UDP packets without user-mode processing.

                      in reply to: Create New Ethernet Packet problem #6376
                      Vadim Smirnov
                      Keymaster

                        Can I do it using winpkfilter ? If yes how can I do that ?

                        You can. Just set IP/TCP headers as I have set Ethernet header in the sample above. The actual values of IP/TCP headers depend from the packet you intend to form.

                        pavankvnaidu posted a sample where he tries to initialize IP and UDP headers, you have to do the similar job.

                        in reply to: VirtNet doesn’t appear in taskmgr #6549
                        Vadim Smirnov
                        Keymaster

                          Actually that depends on how you do copy data. If, an example, you have VirtNet NIC with IP address 192.168.1.101 and send ping packets on it:

                          ping 192.168.1.101 -t

                          Then actually non of the ping echo packet ever really reach the NIC, all data sent/received to/from local interfaces are processed inside TCP/IP. So no real network usage….

                          in reply to: NDIS IM – change packet content #6535
                          Vadim Smirnov
                          Keymaster

                            может ли происходить такое из-за того, что реальный отправляемый пакет отличается по длине от исходного?

                            Нет, скорее уж потому что ты каким-то образом поломал оригинальный пакет… Падает то система на освобождении оригинального пакета…

                            Где-то что-то сделано неверно, но вот что и где…

                            in reply to: detect Sent or received message? #6544
                            Vadim Smirnov
                            Keymaster

                              please do not say me though the winpkfilter data. How can i handle that though the gernal ip-header or tcp-header?

                              You can try to match Ethernet/IP address information (an example, source MAC == local NIC MAC ==> outgoing), but this does not give any guarantee because it is possible to send an arbitrary packet on the network.

                              in reply to: Packet Length via ip_len failed? #6543
                              Vadim Smirnov
                              Keymaster

                                pIpHeader->ip_len is in network byte order, so it should be:

                                DWORD dwDataLength = ntohs(pIpHeader->ip_len) - ( pIpHeader->ip_hl*4 + pTcpHeader->th_off*4);
                                in reply to: Create New Ethernet Packet problem #6374
                                Vadim Smirnov
                                Keymaster

                                  Can winpkfilter be used to send packet as if it is coming from remote PC ( internet remote host like yahoo ? )

                                  Sure. The easiest way for you to start is take and parse the normally received packet (intercepted from the network). You can do it with one of the network sniffers (like Network Monitor or Ethereal). Then just build your own packet with WinpkFilter on the same way. Of course it requires some understanding of how TCP/IP works..

                                Viewing 15 posts - 961 through 975 (of 1,486 total)