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/* $Id: Pcap.cpp $ */
/** @file
* Helpers for writing libpcap files.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "Pcap.h"
#include <iprt/file.h>
#include <iprt/stream.h>
#include <iprt/time.h>
#include <iprt/errcore.h>
#include <VBox/vmm/pdmnetinline.h>
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/* "libpcap" magic */
#define PCAP_MAGIC 0xa1b2c3d4
/* "libpcap" file header (minus magic number). */
struct pcap_hdr
{
uint16_t version_major; /* major version number = 2 */
uint16_t version_minor; /* minor version number = 4 */
int32_t thiszone; /* GMT to local correction = 0 */
uint32_t sigfigs; /* accuracy of timestamps = 0 */
uint32_t snaplen; /* max length of captured packets, in octets = 0xffff */
uint32_t network; /* data link type = 01 */
};
/* "libpcap" record header. */
struct pcaprec_hdr
{
uint32_t ts_sec; /* timestamp seconds */
uint32_t ts_usec; /* timestamp microseconds */
uint32_t incl_len; /* number of octets of packet saved in file */
uint32_t orig_len; /* actual length of packet */
};
struct pcaprec_hdr_init
{
uint32_t u32Magic;
struct pcap_hdr pcap;
};
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
static pcaprec_hdr_init const s_Hdr =
{
PCAP_MAGIC,
{ 2, 4, 0, 0, 0xffff, 1 },
};
static const char s_szDummyData[] = { 0, 0, 0, 0 };
/**
* Internal helper.
*/
static void pcapCalcHeader(struct pcaprec_hdr *pHdr, uint64_t StartNanoTS, size_t cbFrame, size_t cbMax)
{
uint64_t u64TS = RTTimeNanoTS() - StartNanoTS;
pHdr->ts_sec = (uint32_t)(u64TS / 1000000000);
pHdr->ts_usec = (uint32_t)((u64TS / 1000) % 1000000);
pHdr->incl_len = (uint32_t)RT_MIN(cbFrame, cbMax);
pHdr->orig_len = (uint32_t)cbFrame;
}
/**
* Internal helper.
*/
static void pcapUpdateHeader(struct pcaprec_hdr *pHdr, size_t cbFrame, size_t cbMax)
{
pHdr->incl_len = (uint32_t)RT_MIN(cbFrame, cbMax);
pHdr->orig_len = (uint32_t)cbFrame;
}
/**
* Writes the stream header.
*
* @returns IPRT status code, @see RTStrmWrite.
*
* @param pStream The stream handle.
* @param StartNanoTS What to subtract from the RTTimeNanoTS output.
*/
int PcapStreamHdr(PRTSTREAM pStream, uint64_t StartNanoTS)
{
int rc1 = RTStrmWrite(pStream, &s_Hdr, sizeof(s_Hdr));
int rc2 = PcapStreamFrame(pStream, StartNanoTS, s_szDummyData, 60, sizeof(s_szDummyData));
return RT_SUCCESS(rc1) ? rc2 : rc1;
}
/**
* Writes a frame to a stream.
*
* @returns IPRT status code, @see RTStrmWrite.
*
* @param pStream The stream handle.
* @param StartNanoTS What to subtract from the RTTimeNanoTS output.
* @param pvFrame The start of the frame.
* @param cbFrame The size of the frame.
* @param cbMax The max number of bytes to include in the file.
*/
int PcapStreamFrame(PRTSTREAM pStream, uint64_t StartNanoTS, const void *pvFrame, size_t cbFrame, size_t cbMax)
{
struct pcaprec_hdr Hdr;
pcapCalcHeader(&Hdr, StartNanoTS, cbFrame, cbMax);
int rc1 = RTStrmWrite(pStream, &Hdr, sizeof(Hdr));
int rc2 = RTStrmWrite(pStream, pvFrame, Hdr.incl_len);
return RT_SUCCESS(rc1) ? rc2 : rc1;
}
/**
* Writes a GSO frame to a stream.
*
* @returns IPRT status code, @see RTStrmWrite.
*
* @param pStream The stream handle.
* @param StartNanoTS What to subtract from the RTTimeNanoTS output.
* @param pGso Pointer to the GSO context.
* @param pvFrame The start of the GSO frame.
* @param cbFrame The size of the GSO frame.
* @param cbSegMax The max number of bytes to include in the file for
* each segment.
*/
int PcapStreamGsoFrame(PRTSTREAM pStream, uint64_t StartNanoTS, PCPDMNETWORKGSO pGso,
const void *pvFrame, size_t cbFrame, size_t cbSegMax)
{
struct pcaprec_hdr Hdr;
pcapCalcHeader(&Hdr, StartNanoTS, 0, 0);
uint8_t const *pbFrame = (uint8_t const *)pvFrame;
uint8_t abHdrs[256];
uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, cbFrame);
for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
{
uint32_t cbSegPayload, cbHdrs;
uint32_t offSegPayload = PDMNetGsoCarveSegment(pGso, pbFrame, cbFrame, iSeg, cSegs, abHdrs, &cbHdrs, &cbSegPayload);
pcapUpdateHeader(&Hdr, cbHdrs + cbSegPayload, cbSegMax);
int rc = RTStrmWrite(pStream, &Hdr, sizeof(Hdr));
if (RT_FAILURE(rc))
return rc;
rc = RTStrmWrite(pStream, abHdrs, RT_MIN(Hdr.incl_len, cbHdrs));
if (RT_SUCCESS(rc) && Hdr.incl_len > cbHdrs)
rc = RTStrmWrite(pStream, pbFrame + offSegPayload, Hdr.incl_len - cbHdrs);
if (RT_FAILURE(rc))
return rc;
}
return VINF_SUCCESS;
}
/**
* Writes the file header.
*
* @returns IPRT status code, @see RTFileWrite.
*
* @param File The file handle.
* @param StartNanoTS What to subtract from the RTTimeNanoTS output.
*/
int PcapFileHdr(RTFILE File, uint64_t StartNanoTS)
{
int rc1 = RTFileWrite(File, &s_Hdr, sizeof(s_Hdr), NULL);
int rc2 = PcapFileFrame(File, StartNanoTS, s_szDummyData, 60, sizeof(s_szDummyData));
return RT_SUCCESS(rc1) ? rc2 : rc1;
}
/**
* Writes a frame to a file.
*
* @returns IPRT status code, @see RTFileWrite.
*
* @param File The file handle.
* @param StartNanoTS What to subtract from the RTTimeNanoTS output.
* @param pvFrame The start of the frame.
* @param cbFrame The size of the frame.
* @param cbMax The max number of bytes to include in the file.
*/
int PcapFileFrame(RTFILE File, uint64_t StartNanoTS, const void *pvFrame, size_t cbFrame, size_t cbMax)
{
struct pcaprec_hdr Hdr;
pcapCalcHeader(&Hdr, StartNanoTS, cbFrame, cbMax);
int rc1 = RTFileWrite(File, &Hdr, sizeof(Hdr), NULL);
int rc2 = RTFileWrite(File, pvFrame, Hdr.incl_len, NULL);
return RT_SUCCESS(rc1) ? rc2 : rc1;
}
/**
* Writes a GSO frame to a file.
*
* @returns IPRT status code, @see RTFileWrite.
*
* @param File The file handle.
* @param StartNanoTS What to subtract from the RTTimeNanoTS output.
* @param pGso Pointer to the GSO context.
* @param pvFrame The start of the GSO frame.
* @param cbFrame The size of the GSO frame.
* @param cbSegMax The max number of bytes to include in the file for
* each segment.
*/
int PcapFileGsoFrame(RTFILE File, uint64_t StartNanoTS, PCPDMNETWORKGSO pGso,
const void *pvFrame, size_t cbFrame, size_t cbSegMax)
{
struct pcaprec_hdr Hdr;
pcapCalcHeader(&Hdr, StartNanoTS, 0, 0);
uint8_t const *pbFrame = (uint8_t const *)pvFrame;
uint8_t abHdrs[256];
uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, cbFrame);
for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
{
uint32_t cbSegPayload, cbHdrs;
uint32_t offSegPayload = PDMNetGsoCarveSegment(pGso, pbFrame, cbFrame, iSeg, cSegs, abHdrs, &cbHdrs, &cbSegPayload);
pcapUpdateHeader(&Hdr, cbHdrs + cbSegPayload, cbSegMax);
int rc = RTFileWrite(File, &Hdr, sizeof(Hdr), NULL);
if (RT_FAILURE(rc))
return rc;
rc = RTFileWrite(File, abHdrs, RT_MIN(Hdr.incl_len, cbHdrs), NULL);
if (RT_SUCCESS(rc) && Hdr.incl_len > cbHdrs)
rc = RTFileWrite(File, pbFrame + offSegPayload, Hdr.incl_len - cbHdrs, NULL);
if (RT_FAILURE(rc))
return rc;
}
return VINF_SUCCESS;
}
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