/* $Id: VUSBSnifferPcapNg.cpp 65895 2017-02-28 10:41:05Z vboxsync $ */ /** @file * Virtual USB Sniffer facility - PCAP-NG format writer. */ /* * Copyright (C) 2014-2017 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_DRV_VUSB #include #include #include #include #include #include #include "VUSBSnifferInternal.h" /********************************************************************************************************************************* * Defined Constants And Macros * *********************************************************************************************************************************/ /** DumpFile Section Header Block type. */ #define DUMPFILE_SHB_BLOCK_TYPE UINT32_C(0x0a0d0d0a) /** The byte order magic value. */ #define DUMPFILE_SHB_BYTE_ORDER_MAGIC UINT32_C(0x1a2b3c4d) /** Current major version. */ #define DUMPFILE_SHB_VERSION_MAJOR UINT16_C(1) /** Current minor version. */ #define DUMPFILE_SHB_VERSION_MINOR UINT16_C(0) /** Block type for the interface descriptor block. */ #define DUMPFILE_IDB_BLOCK_TYPE UINT32_C(0x00000001) /** USB link type. */ #define DUMPFILE_IDB_LINK_TYPE_USB_LINUX UINT16_C(189) #define DUMPFILE_IDB_LINK_TYPE_USB_LINUX_MMAPED UINT16_C(220) /** Block type for an enhanced packet block. */ #define DUMPFILE_EPB_BLOCK_TYPE UINT32_C(0x00000006) /** USB packet event types. */ #define DUMPFILE_USB_EVENT_TYPE_SUBMIT ('S') #define DUMPFILE_USB_EVENT_TYPE_COMPLETE ('C') #define DUMPFILE_USB_EVENT_TYPE_ERROR ('E') #define DUMPFILE_OPTION_CODE_END UINT16_C(0) #define DUMPFILE_OPTION_CODE_COMMENT UINT16_C(1) #define DUMPFILE_OPTION_CODE_HARDWARE UINT16_C(2) #define DUMPFILE_OPTION_CODE_OS UINT16_C(3) #define DUMPFILE_OPTION_CODE_USERAPP UINT16_C(4) #define DUMPFILE_IDB_OPTION_TS_RESOLUTION UINT16_C(9) /********************************************************************************************************************************* * DumpFile format structures * *********************************************************************************************************************************/ /** * DumpFile Block header. */ typedef struct DumpFileBlockHdr { /** Block type. */ uint32_t u32BlockType; /** Block total length. */ uint32_t u32BlockTotalLength; } DumpFileBlockHdr; /** Pointer to a block header. */ typedef DumpFileBlockHdr *PDumpFileBlockHdr; /** * DumpFile Option header. */ typedef struct DumpFileOptionHdr { /** Option code. */ uint16_t u16OptionCode; /** Block total length. */ uint16_t u16OptionLength; } DumpFileOptionHdr; /** Pointer to a option header. */ typedef DumpFileOptionHdr *PDumpFileOptionHdr; /** * DumpFile Section Header Block. */ typedef struct DumpFileShb { /** Block header. */ DumpFileBlockHdr Hdr; /** Byte order magic. */ uint32_t u32ByteOrderMagic; /** Major version. */ uint16_t u16VersionMajor; /** Minor version. */ uint16_t u16VersionMinor; /** Section length. */ uint64_t u64SectionLength; } DumpFileShb; /** Pointer to a Section Header Block. */ typedef DumpFileShb *PDumpFileShb; /** * DumpFile Interface description block. */ typedef struct DumpFileIdb { /** Block header. */ DumpFileBlockHdr Hdr; /** Link type. */ uint16_t u16LinkType; /** Reserved. */ uint16_t u16Reserved; /** Maximum number of bytes dumped from each packet. */ uint32_t u32SnapLen; } DumpFileIdb; /** Pointer to an Interface description block. */ typedef DumpFileIdb *PDumpFileIdb; /** * DumpFile Enhanced packet block. */ typedef struct DumpFileEpb { /** Block header. */ DumpFileBlockHdr Hdr; /** Interface ID. */ uint32_t u32InterfaceId; /** Timestamp (high). */ uint32_t u32TimestampHigh; /** Timestamp (low). */ uint32_t u32TimestampLow; /** Captured packet length. */ uint32_t u32CapturedLen; /** Original packet length. */ uint32_t u32PacketLen; } DumpFileEpb; /** Pointer to an Enhanced packet block. */ typedef DumpFileEpb *PDumpFileEpb; /** * USB setup URB data. */ typedef struct DumpFileUsbSetup { uint8_t bmRequestType; uint8_t bRequest; uint16_t wValue; uint16_t wIndex; uint16_t wLength; } DumpFileUsbSetup; typedef DumpFileUsbSetup *PDumpFileUsbSetup; /** * USB Isochronous data. */ typedef struct DumpFileIsoRec { int32_t i32ErrorCount; int32_t i32NumDesc; } DumpFileIsoRec; typedef DumpFileIsoRec *PDumpFileIsoRec; /** * USB packet header (Linux mmapped variant). */ typedef struct DumpFileUsbHeaderLnxMmapped { /** Packet Id. */ uint64_t u64Id; /** Event type. */ uint8_t u8EventType; /** Transfer type. */ uint8_t u8TransferType; /** Endpoint number. */ uint8_t u8EndpointNumber; /** Device address. */ uint8_t u8DeviceAddress; /** Bus id. */ uint16_t u16BusId; /** Setup flag != 0 if the URB setup header is not present. */ uint8_t u8SetupFlag; /** Data present flag != 0 if the URB data is not present. */ uint8_t u8DataFlag; /** Timestamp (second part). */ uint64_t u64TimestampSec; /** Timestamp (us part). */ uint32_t u32TimestampUSec; /** Status. */ int32_t i32Status; /** URB length. */ uint32_t u32UrbLength; /** Recorded data length. */ uint32_t u32DataLength; /** Union of data for different URB types. */ union { DumpFileUsbSetup UsbSetup; DumpFileIsoRec IsoRec; } u; int32_t i32Interval; int32_t i32StartFrame; /** Copy of transfer flags. */ uint32_t u32XferFlags; /** Number of isochronous descriptors. */ uint32_t u32NumDesc; } DumpFileUsbHeaderLnxMmapped; /** Pointer to a USB packet header. */ typedef DumpFileUsbHeaderLnxMmapped *PDumpFileUsbHeaderLnxMmapped; AssertCompileSize(DumpFileUsbHeaderLnxMmapped, 64); /** * USB packet isochronous descriptor. */ typedef struct DumpFileUsbIsoDesc { int32_t i32Status; uint32_t u32Offset; uint32_t u32Len; uint8_t au8Padding[4]; } DumpFileUsbIsoDesc; typedef DumpFileUsbIsoDesc *PDumpFileUsbIsoDesc; /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** * The internal VUSB sniffer state. */ typedef struct VUSBSNIFFERFMTINT { /** Stream handle. */ PVUSBSNIFFERSTRM pStrm; /** Current size of the block being written. */ uint32_t cbBlockCur; /** Maximum size allocated for the block. */ uint32_t cbBlockMax; /** Current block header. */ PDumpFileBlockHdr pBlockHdr; /** Pointer to the block data which will be written on commit. */ uint8_t *pbBlockData; } VUSBSNIFFERFMTINT; /********************************************************************************************************************************* * Static Variables * *********************************************************************************************************************************/ /** * Supported file extensions. */ static const char *s_apszFileExts[] = { "pcap", "pcapng", NULL }; /********************************************************************************************************************************* * Internal Functions * *********************************************************************************************************************************/ /** * Allocates additional space for the block. * * @returns Pointer to the new unused space or NULL if out of memory. * @param pThis The VUSB sniffer instance. * @param cbAdditional The additional memory requested. */ static void *vusbSnifferBlockAllocSpace(PVUSBSNIFFERFMTINT pThis, uint32_t cbAdditional) { /* Fast path where we have enough memory allocated. */ if (pThis->cbBlockCur + cbAdditional <= pThis->cbBlockMax) { void *pv = pThis->pbBlockData + pThis->cbBlockCur; pThis->cbBlockCur += cbAdditional; return pv; } /* Allocate additional memory. */ uint32_t cbNew = pThis->cbBlockCur + cbAdditional; uint8_t *pbDataNew = (uint8_t *)RTMemRealloc(pThis->pbBlockData, cbNew); if (pbDataNew) { pThis->pbBlockData = pbDataNew; pThis->pBlockHdr = (PDumpFileBlockHdr)pbDataNew; void *pv = pThis->pbBlockData + pThis->cbBlockCur; pThis->cbBlockCur = cbNew; pThis->cbBlockMax = cbNew; return pv; } return NULL; } /** * Adds new data to the current block. * * @returns VBox status code. * @param pThis The VUSB sniffer instance. * @param pvData The data to add. * @param cbData Amount of data to add. */ static int vusbSnifferBlockAddData(PVUSBSNIFFERFMTINT pThis, const void *pvData, uint32_t cbData) { int rc = VINF_SUCCESS; Assert(pThis->cbBlockCur); AssertPtr(pThis->pBlockHdr); void *pv = vusbSnifferBlockAllocSpace(pThis, cbData); if (pv) memcpy(pv, pvData, cbData); else rc = VERR_NO_MEMORY; return rc; } /** * Aligns the current block data to a 32bit boundary. * * @returns VBox status code. * @param pThis The VUSB sniffer instance. */ static int vusbSnifferBlockAlign(PVUSBSNIFFERFMTINT pThis) { int rc = VINF_SUCCESS; Assert(pThis->cbBlockCur); /* Pad to 32bits. */ uint8_t abPad[3] = { 0 }; uint32_t cbPad = RT_ALIGN_32(pThis->cbBlockCur, 4) - pThis->cbBlockCur; Assert(cbPad <= 3); if (cbPad) rc = vusbSnifferBlockAddData(pThis, abPad, cbPad); return rc; } /** * Commits the current block to the capture file. * * @returns VBox status code. * @param pThis The VUSB sniffer instance. */ static int vusbSnifferBlockCommit(PVUSBSNIFFERFMTINT pThis) { int rc = VINF_SUCCESS; AssertPtr(pThis->pBlockHdr); rc = vusbSnifferBlockAlign(pThis); if (RT_SUCCESS(rc)) { /* Update the block total length field. */ uint32_t *pcbTotalLength = (uint32_t *)vusbSnifferBlockAllocSpace(pThis, 4); if (pcbTotalLength) { *pcbTotalLength = pThis->cbBlockCur; pThis->pBlockHdr->u32BlockTotalLength = pThis->cbBlockCur; /* Write the data. */ rc = pThis->pStrm->pfnWrite(pThis->pStrm, pThis->pbBlockData, pThis->cbBlockCur); pThis->cbBlockCur = 0; pThis->pBlockHdr = NULL; } else rc = VERR_NO_MEMORY; } return rc; } /** * Starts a new block for capturing. * * @returns VBox status code. * @param pThis The VUSB sniffer instance. * @param pBlockHdr Pointer to the block header for the new block. * @param cbData Amount of data added with this block. */ static int vusbSnifferBlockNew(PVUSBSNIFFERFMTINT pThis, PDumpFileBlockHdr pBlockHdr, uint32_t cbData) { int rc = VINF_SUCCESS; /* Validate we don't get called while another block is active. */ Assert(!pThis->cbBlockCur); Assert(!pThis->pBlockHdr); pThis->pBlockHdr = (PDumpFileBlockHdr)vusbSnifferBlockAllocSpace(pThis, cbData); if (pThis->pBlockHdr) memcpy(pThis->pBlockHdr, pBlockHdr, cbData); else rc = VERR_NO_MEMORY; return rc; } /** * Add a new option to the current block. * * @returns VBox status code. * @param pThis The VUSB sniffer instance. * @param u16OptionCode The option code identifying the type of option. * @param pvOption Raw data for the option. * @param cbOption Size of the optiob data. */ static int vusbSnifferAddOption(PVUSBSNIFFERFMTINT pThis, uint16_t u16OptionCode, const void *pvOption, size_t cbOption) { AssertStmt((uint16_t)cbOption == cbOption, cbOption = UINT16_MAX); DumpFileOptionHdr OptHdr; OptHdr.u16OptionCode = u16OptionCode; OptHdr.u16OptionLength = (uint16_t)cbOption; int rc = vusbSnifferBlockAddData(pThis, &OptHdr, sizeof(OptHdr)); if ( RT_SUCCESS(rc) && u16OptionCode != DUMPFILE_OPTION_CODE_END && cbOption != 0) { rc = vusbSnifferBlockAddData(pThis, pvOption, (uint16_t)cbOption); if (RT_SUCCESS(rc)) rc = vusbSnifferBlockAlign(pThis); } return rc; } /** @interface_method_impl{VUSBSNIFFERFMT,pfnInit} */ static DECLCALLBACK(int) vusbSnifferFmtPcapNgInit(PVUSBSNIFFERFMTINT pThis, PVUSBSNIFFERSTRM pStrm) { pThis->pStrm = pStrm; pThis->cbBlockCur = 0; pThis->cbBlockMax = 0; pThis->pbBlockData = NULL; /* Write header and link type blocks. */ DumpFileShb Shb; Shb.Hdr.u32BlockType = DUMPFILE_SHB_BLOCK_TYPE; Shb.Hdr.u32BlockTotalLength = 0; /* Filled out by lower layer. */ Shb.u32ByteOrderMagic = DUMPFILE_SHB_BYTE_ORDER_MAGIC; Shb.u16VersionMajor = DUMPFILE_SHB_VERSION_MAJOR; Shb.u16VersionMinor = DUMPFILE_SHB_VERSION_MINOR; Shb.u64SectionLength = UINT64_C(0xffffffffffffffff); /* -1 */ /* Write the blocks. */ int rc = vusbSnifferBlockNew(pThis, &Shb.Hdr, sizeof(Shb)); if (RT_SUCCESS(rc)) { const char *pszOpt = RTBldCfgTargetDotArch(); rc = vusbSnifferAddOption(pThis, DUMPFILE_OPTION_CODE_HARDWARE, pszOpt, strlen(pszOpt) + 1); } if (RT_SUCCESS(rc)) { char szTmp[512]; size_t cbTmp = sizeof(szTmp); RT_ZERO(szTmp); /* Build the OS code. */ rc = RTSystemQueryOSInfo(RTSYSOSINFO_PRODUCT, szTmp, cbTmp); if (RT_SUCCESS(rc)) { size_t cb = strlen(szTmp); szTmp[cb] = ' '; rc = RTSystemQueryOSInfo(RTSYSOSINFO_RELEASE, &szTmp[cb + 1], cbTmp - (cb + 1)); if (RT_SUCCESS(rc)) { cb = strlen(szTmp); szTmp[cb] = ' '; rc = RTSystemQueryOSInfo(RTSYSOSINFO_VERSION, &szTmp[cb + 1], cbTmp - (cb + 1)); } } if (RT_SUCCESS(rc) || rc == VERR_BUFFER_OVERFLOW) rc = vusbSnifferAddOption(pThis, DUMPFILE_OPTION_CODE_OS, szTmp, strlen(szTmp) + 1); else rc = VINF_SUCCESS; /* Skip OS code if building the string failed. */ } if (RT_SUCCESS(rc)) { /** @todo Add product info. */ } if (RT_SUCCESS(rc)) rc = vusbSnifferAddOption(pThis, DUMPFILE_OPTION_CODE_END, NULL, 0); if (RT_SUCCESS(rc)) rc = vusbSnifferBlockCommit(pThis); /* Write Interface descriptor block. */ if (RT_SUCCESS(rc)) { DumpFileIdb Idb; Idb.Hdr.u32BlockType = DUMPFILE_IDB_BLOCK_TYPE; Idb.Hdr.u32BlockTotalLength = 0; /* Filled out by lower layer. */ Idb.u16LinkType = DUMPFILE_IDB_LINK_TYPE_USB_LINUX_MMAPED; Idb.u16Reserved = 0; Idb.u32SnapLen = UINT32_C(0xffffffff); rc = vusbSnifferBlockNew(pThis, &Idb.Hdr, sizeof(Idb)); if (RT_SUCCESS(rc)) { uint8_t u8TsResolution = 9; /* Nano second resolution. */ /* Add timestamp resolution option. */ rc = vusbSnifferAddOption(pThis, DUMPFILE_IDB_OPTION_TS_RESOLUTION, &u8TsResolution, sizeof(u8TsResolution)); } if (RT_SUCCESS(rc)) rc = vusbSnifferAddOption(pThis, DUMPFILE_OPTION_CODE_END, NULL, 0); if (RT_SUCCESS(rc)) rc = vusbSnifferBlockCommit(pThis); } if ( RT_FAILURE(rc) && pThis->pbBlockData) RTMemFree(pThis->pbBlockData); return rc; } /** @interface_method_impl{VUSBSNIFFERFMT,pfnDestroy} */ static DECLCALLBACK(void) vusbSnifferFmtPcapNgDestroy(PVUSBSNIFFERFMTINT pThis) { if (pThis->pbBlockData) RTMemFree(pThis->pbBlockData); } /** @interface_method_impl{VUSBSNIFFERFMT,pfnRecordEvent} */ static DECLCALLBACK(int) vusbSnifferFmtPcapNgRecordEvent(PVUSBSNIFFERFMTINT pThis, PVUSBURB pUrb, VUSBSNIFFEREVENT enmEvent) { DumpFileEpb Epb; DumpFileUsbHeaderLnxMmapped UsbHdr; uint32_t cbCapturedLength = sizeof(UsbHdr); uint8_t *pbData = NULL; RTTIMESPEC TimeNow; RTTimeNow(&TimeNow); uint64_t u64TimestampEvent = RTTimeSpecGetNano(&TimeNow); /* Start with the enhanced packet block. */ Epb.Hdr.u32BlockType = DUMPFILE_EPB_BLOCK_TYPE; Epb.Hdr.u32BlockTotalLength = 0; Epb.u32InterfaceId = 0; Epb.u32TimestampHigh = (u64TimestampEvent >> 32) & UINT32_C(0xffffffff); Epb.u32TimestampLow = u64TimestampEvent & UINT32_C(0xffffffff); UsbHdr.u64Id = (uintptr_t)pUrb; /** @todo check whether the pointer is a good ID. */ uint32_t cbUrbLength; switch (enmEvent) { case VUSBSNIFFEREVENT_SUBMIT: UsbHdr.u8EventType = DUMPFILE_USB_EVENT_TYPE_SUBMIT; cbUrbLength = pUrb->cbData; break; case VUSBSNIFFEREVENT_COMPLETE: UsbHdr.u8EventType = DUMPFILE_USB_EVENT_TYPE_COMPLETE; cbUrbLength = pUrb->cbData; break; case VUSBSNIFFEREVENT_ERROR_SUBMIT: case VUSBSNIFFEREVENT_ERROR_COMPLETE: UsbHdr.u8EventType = DUMPFILE_USB_EVENT_TYPE_ERROR; cbUrbLength = 0; break; default: AssertMsgFailed(("Invalid event type %d\n", enmEvent)); cbUrbLength = 0; } uint32_t cbDataLength = cbUrbLength; pbData = &pUrb->abData[0]; uint32_t cIsocPkts = 0; switch (pUrb->enmType) { case VUSBXFERTYPE_ISOC: { int32_t cErrors = 0; UsbHdr.u8TransferType = 0; cIsocPkts = pUrb->cIsocPkts; for (unsigned i = 0; i < cIsocPkts; i++) if ( pUrb->aIsocPkts[i].enmStatus != VUSBSTATUS_OK && pUrb->aIsocPkts[i].enmStatus != VUSBSTATUS_NOT_ACCESSED) cErrors++; UsbHdr.u.IsoRec.i32ErrorCount = cErrors; UsbHdr.u.IsoRec.i32NumDesc = pUrb->cIsocPkts; cbCapturedLength += cIsocPkts * sizeof(DumpFileUsbIsoDesc); break; } case VUSBXFERTYPE_BULK: UsbHdr.u8TransferType = 3; break; case VUSBXFERTYPE_INTR: UsbHdr.u8TransferType = 1; break; case VUSBXFERTYPE_CTRL: case VUSBXFERTYPE_MSG: UsbHdr.u8TransferType = 2; break; default: AssertMsgFailed(("invalid transfer type %d\n", pUrb->enmType)); } if (pUrb->enmDir == VUSBDIRECTION_IN) { if (enmEvent == VUSBSNIFFEREVENT_SUBMIT) cbDataLength = 0; } else if (pUrb->enmDir == VUSBDIRECTION_OUT) { if ( enmEvent == VUSBSNIFFEREVENT_COMPLETE || pUrb->enmType == VUSBXFERTYPE_CTRL || pUrb->enmType == VUSBXFERTYPE_MSG) cbDataLength = 0; } else if ( pUrb->enmDir == VUSBDIRECTION_SETUP && cbDataLength >= sizeof(VUSBSETUP)) cbDataLength -= sizeof(VUSBSETUP); Epb.u32CapturedLen = cbCapturedLength + cbDataLength; Epb.u32PacketLen = cbCapturedLength + cbUrbLength; UsbHdr.u8EndpointNumber = pUrb->EndPt | (pUrb->enmDir == VUSBDIRECTION_IN ? 0x80 : 0x00); UsbHdr.u8DeviceAddress = pUrb->DstAddress; UsbHdr.u16BusId = 0; UsbHdr.u8DataFlag = cbDataLength ? 0 : 1; UsbHdr.u64TimestampSec = u64TimestampEvent / RT_NS_1SEC_64; UsbHdr.u32TimestampUSec = u64TimestampEvent / RT_NS_1US_64 - UsbHdr.u64TimestampSec * RT_US_1SEC; UsbHdr.i32Status = pUrb->enmStatus; UsbHdr.u32UrbLength = cbUrbLength; UsbHdr.u32DataLength = cbDataLength + cIsocPkts * sizeof(DumpFileUsbIsoDesc); UsbHdr.i32Interval = 0; UsbHdr.i32StartFrame = 0; UsbHdr.u32XferFlags = 0; UsbHdr.u32NumDesc = cIsocPkts; if ( (pUrb->enmType == VUSBXFERTYPE_MSG || pUrb->enmType == VUSBXFERTYPE_CTRL) && enmEvent == VUSBSNIFFEREVENT_SUBMIT) { PVUSBSETUP pSetup = (PVUSBSETUP)pUrb->abData; UsbHdr.u.UsbSetup.bmRequestType = pSetup->bmRequestType; UsbHdr.u.UsbSetup.bRequest = pSetup->bRequest; UsbHdr.u.UsbSetup.wValue = pSetup->wValue; UsbHdr.u.UsbSetup.wIndex = pSetup->wIndex; UsbHdr.u.UsbSetup.wLength = pSetup->wLength; UsbHdr.u8SetupFlag = 0; } else UsbHdr.u8SetupFlag = '-'; /* Follow usbmon source here. */ /* Write the packet to the capture file. */ int rc = vusbSnifferBlockNew(pThis, &Epb.Hdr, sizeof(Epb)); if (RT_SUCCESS(rc)) rc = vusbSnifferBlockAddData(pThis, &UsbHdr, sizeof(UsbHdr)); /* Add Isochronous descriptors now. */ for (unsigned i = 0; i < cIsocPkts && RT_SUCCESS(rc); i++) { DumpFileUsbIsoDesc IsoDesc; IsoDesc.i32Status = pUrb->aIsocPkts[i].enmStatus; IsoDesc.u32Offset = pUrb->aIsocPkts[i].off; IsoDesc.u32Len = pUrb->aIsocPkts[i].cb; rc = vusbSnifferBlockAddData(pThis, &IsoDesc, sizeof(IsoDesc)); } /* Record data. */ if ( RT_SUCCESS(rc) && cbDataLength) rc = vusbSnifferBlockAddData(pThis, pbData, cbDataLength); if (RT_SUCCESS(rc)) rc = vusbSnifferAddOption(pThis, DUMPFILE_OPTION_CODE_END, NULL, 0); if (RT_SUCCESS(rc)) rc = vusbSnifferBlockCommit(pThis); return rc; } /** * VUSB sniffer format writer. */ const VUSBSNIFFERFMT g_VUsbSnifferFmtPcapNg = { /** szName */ "PCAPNG", /** pszDesc */ "PCAP-NG format writer compatible with WireShark", /** papszFileExts */ &s_apszFileExts[0], /** cbFmt */ sizeof(VUSBSNIFFERFMTINT), /** pfnInit */ vusbSnifferFmtPcapNgInit, /** pfnDestroy */ vusbSnifferFmtPcapNgDestroy, /** pfnRecordEvent */ vusbSnifferFmtPcapNgRecordEvent };