I have a filter driver based on Windows Filtering Platform (WFPSampler) which examine or capture all the UDP packets received by the system. I am able to capture or extract the header from the UDP packet (NET_BUFFER). Now I want to get the packetās actual data or packetās payload (which contains the information) and write that to a .txt file. But I am not able to get the packetās actual data or packetās payload (NET_BUFFER) from the received UDP packet. I am capturing packet on FWPM_LAYER_INBOUND_TRANSPORT_V4 layer.
Try to do it at stream layer and check the streamedit sample. There there is a function something like CopyDataToFlatBuffer where it copies the data payload from a netbuffer to a PVOID allocated buffer.
I have a filter driver based on Windows Filtering Platform (WFPSampler) which examine or capture all the UDP packets received by the system. I am able to capture or extract the header from the UDP packet (NET_BUFFER). Now I want to get the packetās actual data or packetās payload (which contains the information) and write that to a .txt file. But I am not able to get the packetās actual data or packetās payload (NET_BUFFER) from the received UDP packet. I am capturing packet on FWPM_LAYER_INBOUND_TRANSPORT_V4 layer.
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I am using Basic Packet Examination scenario in WFPSampler example. I tried to do it at stream layer. But I am not getting any packet at that layer. I am trying to do it at FWPM_LAYER_INBOUND_IPPACKET_V4 layer and I am able to get the value of header for UDP protocol. But I donāt know how to get the data payload from the packet.
Hi,
As far as I know you can not inspect UDP packets at the stream layer. You
should register to the datagram data layer and get the data from the net
buffers.
××Ŗ××Ø×× 27 ××פ×Ø׳ 2016 3:25 PM,ā ××Ŗ×:
> Hello Gabriel Bercea, > > I am using Basic Packet Examination scenario in WFPSampler example. I > tried to do it at stream layer. But I am not getting any packet at that > layer. I am trying to do it at FWPM_LAYER_INBOUND_IPPACKET_V4 layer and I > am able to get the value of header for UDP protocol. But I donāt know how > to get the data payload from the packet. > > Thanks > > ā > NTFSD is sponsored by OSR > > > MONTHLY seminars on crash dump analysis, WDF, Windows internals and > software drivers! > Details at http: > > To unsubscribe, visit the List Server section of OSR Online at < > http://www.osronline.com/page.cfm?name=ListServer> ></http:>
Thanks for your reply. But you didnāt tell me how to extract or get the payload from NET_BUFFER structure. I am able to get the packet and the header from the packet. But i want to write the actual data from packet (payload of the packet) to a file.
Thanks for your reply. But you didnāt tell me how to extract or get the payload from NET_BUFFER structure. I am able to get the packet and the header from the packet. But i want to write the actual data from packet (payload of the packet) to a file.