Packetstream android download2/15/2024 A callout must not return FWPS_STREAM_ACTION_NEED_MORE_DATA when the FWPS_CLASSIFY_OUT_FLAG_NO_MORE_DATA flag is set.įor the convenience of being able to scan a stream pattern from a flat buffer, WFP provides the FwpsCopyStreamDataToBuffer0 utility function, which can copy indicated stream data into a contiguous buffer. When the latter flag is set, the callout must accept the indicated data in full. WFP will set the FWPS_CLASSIFY_OUT_FLAG_BUFFER_LIMIT_REACHED flag when it calls the callout's classifyFn function and the buffer space is exhausted. WFP can accumulate up to 8 MB of stream data when FWPS_STREAM_ACTION_NEED_MORE_DATA is set. When streamAction is set, the callout should return FWP_ACTION_NONE from the classifyFn function. If the indicated data is insufficient for the callout to make an inspection decision, it can set the streamAction member of the FWPS_STREAM_CALLOUT_IO_PACKET0 structure to FWPS_STREAM_ACTION_NEED_MORE_DATA and set the countBytesRequired member to the minimal amount WFP should accumulate before the data is indicated again. The callout returns FWP_ACTION_PERMIT with countBytesEnforced set to m. The callout's classifyFn function is called again with m bytes. The callout then returns FWP_ACTION_BLOCK with countBytesEnforced set to p. WFP will call classifyFn again if countBytesEnforced is less than the indicated amount.įrom the classifyFn function, the callout calls the FwpsStreamInjectAsync0 function to inject the replacement pattern p'. The callout's classifyFn function is called again with p + m bytes. The callout returns FWP_ACTION_PERMIT with the countBytesEnforced member set to n. The callout's classifyFn function is called by using n + p + m bytes. To replace a pattern found in the middle of an indicated segment (for example, n bytes followed by a pattern of p bytes followed by m bytes), the callout would follow these steps: This content can be new or can replace blocked data. They can also call the FwpsStreamInjectAsync0 function to add new content to the stream. Inline stream modifiers can edit stream data by permitting or blocking a part of the indicated data by setting the value of the countBytesEnforced member of the FWPS_STREAM_CALLOUT_IO_PACKET0 structure as they return FWP_ACTION_PERMIT or FWP_ACTION_BLOCK from the classifyFn callout function.
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