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/* $Id: VBoxIntnetPcap.cpp $ */
/** @file
* VBoxIntnetPcap - packet capture for VirtualBox internal networks
*/
/*
* Copyright (C) 2021-2023 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 "IntNetIf.h"
#include "Pcap.h"
#include <iprt/buildconfig.h>
#include <iprt/file.h>
#include <iprt/getopt.h>
#include <iprt/message.h>
#include <iprt/process.h>
#include <iprt/stream.h>
#include <iprt/cpp/ministring.h>
#include <VBox/version.h>
/*********************************************************************************************************************************
* Internal Functions *
*********************************************************************************************************************************/
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
static INTNETIFCTX g_hIntNetCtx;
static PRTSTREAM g_pStrmOut;
static uint64_t g_StartNanoTS;
static bool g_fPacketBuffered;
static uint64_t g_cCountDown;
static size_t g_cbSnapLen = 0xffff;
static const RTGETOPTDEF g_aGetOptDef[] =
{
{ "--count", 'c', RTGETOPT_REQ_UINT64 },
{ "--network", 'i', RTGETOPT_REQ_STRING },
{ "--snaplen", 's', RTGETOPT_REQ_UINT32 },
{ "--packet-buffered", 'U', RTGETOPT_REQ_NOTHING },
{ "--write", 'w', RTGETOPT_REQ_STRING },
};
static void checkCaptureLimit(void)
{
if (g_cCountDown > 0)
{
if (g_cCountDown-- == 1)
IntNetR3IfWaitAbort(g_hIntNetCtx);
}
}
static DECLCALLBACK(void) captureFrame(void *pvUser, void *pvFrame, uint32_t cbFrame)
{
RT_NOREF(pvUser);
int rc = PcapStreamFrame(g_pStrmOut, g_StartNanoTS, pvFrame, cbFrame, g_cbSnapLen);
if (RT_FAILURE(rc))
{
RTMsgError("write: %Rrf", rc);
IntNetR3IfWaitAbort(g_hIntNetCtx);
}
if (g_fPacketBuffered)
RTStrmFlush(g_pStrmOut);
checkCaptureLimit();
}
static DECLCALLBACK(void) captureGSO(void *pvUser, PCPDMNETWORKGSO pcGso, uint32_t cbFrame)
{
RT_NOREF(pvUser, pcGso, cbFrame);
checkCaptureLimit();
}
int
main(int argc, char *argv[])
{
int rc = RTR3InitExe(argc, &argv, RTR3INIT_FLAGS_SUPLIB);
if (RT_FAILURE(rc))
return RTMsgInitFailure(rc);
/*
* Parse options
*/
RTGETOPTSTATE State;
rc = RTGetOptInit(&State, argc, argv, g_aGetOptDef, RT_ELEMENTS(g_aGetOptDef), 1, 0);
AssertRC(rc);
const char *pszNetworkName = NULL;
const char *pszPcapFile = NULL;
int ch;
RTGETOPTUNION Val;
while ((ch = RTGetOpt(&State, &Val)) != 0)
{
switch (ch)
{
case 'c': /* --count */
if (Val.u64 == 0)
return RTMsgErrorExit(RTEXITCODE_SYNTAX, "--count must be greater than zero");
g_cCountDown = Val.u64;
break;
case 'i': /* --network */
if (Val.psz[0] == '\0')
return RTMsgErrorExit(RTEXITCODE_SYNTAX, "empty --network option");
pszNetworkName = Val.psz;
break;
case 's': /* --snaplen */
if (Val.u32 == 0)
return RTMsgErrorExit(RTEXITCODE_SYNTAX, "--snaplen must be greater than zero");
g_cbSnapLen = Val.u32;
break;
case 'U': /* --packet-buffered */
g_fPacketBuffered = true;
break;
case 'w': /* --write */
if (Val.psz[0] == '\0')
return RTMsgErrorExit(RTEXITCODE_SYNTAX, "empty --write option");
pszPcapFile = Val.psz;
break;
/*
* Standard options recognized by RTGetOpt()
*/
case 'V': /* --version */
RTPrintf("%sr%u\n", RTBldCfgVersion(), RTBldCfgRevision());
return RTEXITCODE_SUCCESS;
case 'h': /* --help */
RTPrintf("%s Version %sr%u\n"
"Copyright (C) 2009-" VBOX_C_YEAR " " VBOX_VENDOR "\n"
"\n"
"Usage: %s <options>\n"
"\n"
"Options:\n",
RTProcShortName(), RTBldCfgVersion(), RTBldCfgRevision(),
RTProcShortName());
for (size_t i = 0; i < RT_ELEMENTS(g_aGetOptDef); ++i)
RTPrintf(" -%c, %s\n",
g_aGetOptDef[i].iShort, g_aGetOptDef[i].pszLong);
return RTEXITCODE_SUCCESS;
default:
case VINF_GETOPT_NOT_OPTION:
return RTGetOptPrintError(ch, &Val);
}
}
if (!pszNetworkName)
return RTMsgErrorExit(RTEXITCODE_SYNTAX, "No network specified. Please use the --network option");
if (!pszPcapFile)
return RTMsgErrorExit(RTEXITCODE_SYNTAX, "No output file specified. Please use the --write option");
/*
* Open the output file.
*/
if (strcmp(pszPcapFile, "-") == 0)
g_pStrmOut = g_pStdOut;
else
{
rc = RTStrmOpen(pszPcapFile, "wb", &g_pStrmOut);
if (RT_FAILURE(rc))
return RTMsgErrorExitFailure("%s: %Rrf", pszPcapFile, rc);
}
rc = IntNetR3IfCreate(&g_hIntNetCtx, pszNetworkName);
if (RT_FAILURE(rc))
return RTMsgErrorExitFailure("Opening the internal network '%s' failed with %Rrc\n", pszNetworkName, rc);
rc = IntNetR3IfSetPromiscuous(g_hIntNetCtx, true /*fPromiscuous*/);
if (RT_FAILURE(rc))
return RTMsgErrorExitFailure("Enabling promiscuous mode on the internal network '%s' failed with %Rrc\n", pszNetworkName, rc);
rc = IntNetR3IfSetActive(g_hIntNetCtx, true /*fActive*/);
if (RT_FAILURE(rc))
return RTMsgErrorExitFailure("Activating interface on the internal network '%s' failed with %Rrc\n", pszNetworkName, rc);
/*
* Snoop traffic.
*/
g_StartNanoTS = RTTimeNanoTS();
rc = PcapStreamHdr(g_pStrmOut, g_StartNanoTS);
if (RT_FAILURE(rc))
return RTMsgErrorExitFailure("write: %Rrf", rc);
if (g_fPacketBuffered)
RTStrmFlush(g_pStrmOut);
rc = IntNetR3IfPumpPkts(g_hIntNetCtx, captureFrame, NULL /*pvUser*/,
captureGSO, NULL /*pvUserGso*/);
RTEXITCODE rcExit = RT_SUCCESS(RTStrmError(g_pStrmOut)) ? RTEXITCODE_SUCCESS : RTEXITCODE_FAILURE;
rc = RTStrmClose(g_pStrmOut);
if (RT_FAILURE(rc))
rcExit = RTMsgErrorExitFailure("close: %Rrf", rc);
return rcExit;
}
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