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/* $Id: VBoxSF.cpp $ */
/** @file
* VBoxSF - Darwin Shared Folders, KEXT entry points.
*/
/*
* Copyright (C) 2013-2023 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 *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_SHARED_FOLDERS
#include "VBoxSFInternal.h"
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/initterm.h>
#include <VBox/version.h>
#include <VBox/log.h>
/*********************************************************************************************************************************
* Internal Functions *
*********************************************************************************************************************************/
static kern_return_t vboxSfDwnModuleLoad(struct kmod_info *pKModInfo, void *pvData);
static kern_return_t vboxSfDwnModuleUnload(struct kmod_info *pKModInfo, void *pvData);
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** The VBoxGuest service if we've managed to connect to it already. */
static IOService *g_pVBoxGuest = NULL;
/** The shared folder service client structure. */
VBGLSFCLIENT g_SfClientDarwin = { UINT32_MAX, NULL };
/** Number of active mounts. Used for unload prevention. */
uint32_t volatile g_cVBoxSfMounts = 0;
/** VFS table entry for our file system (for vfs_fsremove). */
static vfstable_t g_pVBoxSfVfsTableEntry;
/** For vfs_fsentry. */
static struct vnodeopv_desc *g_apVBoxSfVnodeOpDescList[] =
{
&g_VBoxSfVnodeOpvDesc,
};
/** VFS registration structure. */
static struct vfs_fsentry g_VBoxSfFsEntry =
{
.vfe_vfsops = &g_VBoxSfVfsOps,
.vfe_vopcnt = RT_ELEMENTS(g_apVBoxSfVnodeOpDescList),
.vfe_opvdescs = g_apVBoxSfVnodeOpDescList,
.vfe_fstypenum = -1,
.vfe_fsname = VBOXSF_DARWIN_FS_NAME,
.vfe_flags = VFS_TBLTHREADSAFE /* Required. */
| VFS_TBLFSNODELOCK /* Required. */
| VFS_TBLNOTYPENUM /* No historic file system number. */
| VFS_TBL64BITREADY, /* Can handle 64-bit processes */
/** @todo add VFS_TBLREADDIR_EXTENDED */
.vfe_reserv = { NULL, NULL },
};
/**
* Declare the module stuff.
*/
RT_C_DECLS_BEGIN
extern kern_return_t _start(struct kmod_info *pKModInfo, void *pvData);
extern kern_return_t _stop(struct kmod_info *pKModInfo, void *pvData);
KMOD_EXPLICIT_DECL(VBoxSF, VBOX_VERSION_STRING, _start, _stop)
DECL_HIDDEN_DATA(kmod_start_func_t *) _realmain = vboxSfDwnModuleLoad;
DECL_HIDDEN_DATA(kmod_stop_func_t *) _antimain = vboxSfDwnModuleUnload;
DECL_HIDDEN_DATA(int) _kext_apple_cc = __APPLE_CC__;
RT_C_DECLS_END
/**
* Connect to VBoxGuest and host shared folders service.
*
* @returns true if connected, false if not.
*/
bool vboxSfDwnConnect(void)
{
/*
* Grab VBoxGuest - since it's a dependency of this module, it shouldn't be hard.
*/
if (!g_pVBoxGuest)
{
OSDictionary *pServiceMatcher = IOService::serviceMatching("org_virtualbox_VBoxGuest");
if (pServiceMatcher)
{
IOService *pVBoxGuest = IOService::waitForMatchingService(pServiceMatcher, 10 * RT_NS_1SEC);
if (pVBoxGuest)
g_pVBoxGuest = pVBoxGuest;
else
LogRel(("vboxSfDwnConnect: IOService::waitForMatchingService failed!!\n"));
}
else
LogRel(("vboxSfDwnConnect: serviceMatching failed\n"));
}
if (g_pVBoxGuest)
{
/*
* Get hold of the shared folders service if we haven't already.
*/
if (g_SfClientDarwin.handle != NULL)
return true;
int rc = VbglR0SfConnect(&g_SfClientDarwin);
if (RT_SUCCESS(rc))
{
rc = VbglR0SfSetUtf8(&g_SfClientDarwin);
if (RT_SUCCESS(rc))
return true;
LogRel(("VBoxSF: VbglR0SfSetUtf8 failed: %Rrc\n", rc));
VbglR0SfDisconnect(&g_SfClientDarwin);
g_SfClientDarwin.handle = NULL;
}
else
LogRel(("VBoxSF: VbglR0SfConnect failed: %Rrc\n", rc));
}
return false;
}
/**
* Start the kernel module.
*/
static kern_return_t vboxSfDwnModuleLoad(struct kmod_info *pKModInfo, void *pvData)
{
RT_NOREF(pKModInfo, pvData);
#ifdef DEBUG
printf("vboxSfDwnModuleLoad\n");
RTLogBackdoorPrintf("vboxSfDwnModuleLoad\n");
#endif
/*
* Initialize IPRT and the ring-0 guest library.
*/
int rc = RTR0Init(0);
if (RT_SUCCESS(rc))
{
rc = VbglR0SfInit();
if (RT_SUCCESS(rc))
{
/*
* Register the file system.
*/
rc = vfs_fsadd(&g_VBoxSfFsEntry, &g_pVBoxSfVfsTableEntry);
if (rc == 0)
{
/*
* Try find VBoxGuest and connect to the shared folders service on the host.
*/
/** @todo should we just ignore the error here and retry at mount time?
* Technically, VBoxGuest should be available since it's one of our
* dependencies... */
vboxSfDwnConnect();
/*
* We're done for now. We'll deal with
*/
LogRel(("VBoxSF: loaded\n"));
return KERN_SUCCESS;
}
printf("VBoxSF: vfs_fsadd failed: %d\n", rc);
RTLogBackdoorPrintf("VBoxSF: vfs_fsadd failed: %d\n", rc);
VbglR0SfTerm();
}
else
{
printf("VBoxSF: VbglR0SfInit failed: %d\n", rc);
RTLogBackdoorPrintf("VBoxSF: VbglR0SfInit failed: %Rrc\n", rc);
}
RTR0Term();
}
else
{
printf("VBoxSF: RTR0Init failed: %d\n", rc);
RTLogBackdoorPrintf("VBoxSF: RTR0Init failed: %Rrc\n", rc);
}
return KERN_FAILURE;
}
/**
* Stop the kernel module.
*/
static kern_return_t vboxSfDwnModuleUnload(struct kmod_info *pKModInfo, void *pvData)
{
RT_NOREF(pKModInfo, pvData);
#ifdef DEBUG
printf("vboxSfDwnModuleUnload\n");
RTLogBackdoorPrintf("vboxSfDwnModuleUnload\n");
#endif
/*
* Are we busy? If so fail. Otherwise try deregister the file system.
*/
if (g_cVBoxSfMounts > 0)
{
LogRel(("VBoxSF: Refusing to unload with %u active mounts\n", g_cVBoxSfMounts));
return KERN_NO_ACCESS;
}
if (g_pVBoxSfVfsTableEntry)
{
int rc = vfs_fsremove(g_pVBoxSfVfsTableEntry);
if (rc != 0)
{
LogRel(("VBoxSF: vfs_fsremove failed: %d\n", rc));
return KERN_NO_ACCESS;
}
}
/*
* Disconnect and terminate libraries we're using.
*/
if (g_SfClientDarwin.handle != NULL)
{
VbglR0SfDisconnect(&g_SfClientDarwin);
g_SfClientDarwin.handle = NULL;
}
if (g_pVBoxGuest)
{
g_pVBoxGuest->release();
g_pVBoxGuest = NULL;
}
VbglR0SfTerm();
RTR0Term();
return KERN_SUCCESS;
}
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