| 1 | /* $Id: VBoxSF.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxSF - Darwin Shared Folders, KEXT entry points.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2013-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #define LOG_GROUP LOG_GROUP_SHARED_FOLDERS
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| 33 | #include "VBoxSFInternal.h"
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| 34 |
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| 35 | #include <iprt/asm.h>
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| 36 | #include <iprt/assert.h>
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| 37 | #include <iprt/initterm.h>
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| 38 | #include <VBox/version.h>
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| 39 | #include <VBox/log.h>
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| 40 |
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| 41 |
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| 42 | /*********************************************************************************************************************************
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| 43 | * Internal Functions *
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| 44 | *********************************************************************************************************************************/
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| 45 | static kern_return_t vboxSfDwnModuleLoad(struct kmod_info *pKModInfo, void *pvData);
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| 46 | static kern_return_t vboxSfDwnModuleUnload(struct kmod_info *pKModInfo, void *pvData);
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| 47 |
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| 48 |
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| 49 | /*********************************************************************************************************************************
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| 50 | * Global Variables *
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| 51 | *********************************************************************************************************************************/
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| 52 | /** The VBoxGuest service if we've managed to connect to it already. */
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| 53 | static IOService *g_pVBoxGuest = NULL;
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| 54 | /** The shared folder service client structure. */
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| 55 | VBGLSFCLIENT g_SfClientDarwin = { UINT32_MAX, NULL };
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| 56 | /** Number of active mounts. Used for unload prevention. */
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| 57 | uint32_t volatile g_cVBoxSfMounts = 0;
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| 58 |
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| 59 | /** VFS table entry for our file system (for vfs_fsremove). */
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| 60 | static vfstable_t g_pVBoxSfVfsTableEntry;
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| 61 | /** For vfs_fsentry. */
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| 62 | static struct vnodeopv_desc *g_apVBoxSfVnodeOpDescList[] =
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| 63 | {
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| 64 | &g_VBoxSfVnodeOpvDesc,
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| 65 | };
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| 66 | /** VFS registration structure. */
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| 67 | static struct vfs_fsentry g_VBoxSfFsEntry =
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| 68 | {
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| 69 | .vfe_vfsops = &g_VBoxSfVfsOps,
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| 70 | .vfe_vopcnt = RT_ELEMENTS(g_apVBoxSfVnodeOpDescList),
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| 71 | .vfe_opvdescs = g_apVBoxSfVnodeOpDescList,
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| 72 | .vfe_fstypenum = -1,
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| 73 | .vfe_fsname = VBOXSF_DARWIN_FS_NAME,
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| 74 | .vfe_flags = VFS_TBLTHREADSAFE /* Required. */
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| 75 | | VFS_TBLFSNODELOCK /* Required. */
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| 76 | | VFS_TBLNOTYPENUM /* No historic file system number. */
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| 77 | | VFS_TBL64BITREADY, /* Can handle 64-bit processes */
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| 78 | /** @todo add VFS_TBLREADDIR_EXTENDED */
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| 79 | .vfe_reserv = { NULL, NULL },
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| 80 | };
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| 81 |
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| 82 |
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| 83 | /**
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| 84 | * Declare the module stuff.
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| 85 | */
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| 86 | RT_C_DECLS_BEGIN
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| 87 | extern kern_return_t _start(struct kmod_info *pKModInfo, void *pvData);
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| 88 | extern kern_return_t _stop(struct kmod_info *pKModInfo, void *pvData);
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| 89 |
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| 90 | KMOD_EXPLICIT_DECL(VBoxSF, VBOX_VERSION_STRING, _start, _stop)
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| 91 | DECL_HIDDEN_DATA(kmod_start_func_t *) _realmain = vboxSfDwnModuleLoad;
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| 92 | DECL_HIDDEN_DATA(kmod_stop_func_t *) _antimain = vboxSfDwnModuleUnload;
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| 93 | DECL_HIDDEN_DATA(int) _kext_apple_cc = __APPLE_CC__;
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| 94 | RT_C_DECLS_END
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| 95 |
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| 96 |
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| 97 | /**
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| 98 | * Connect to VBoxGuest and host shared folders service.
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| 99 | *
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| 100 | * @returns true if connected, false if not.
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| 101 | */
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| 102 | bool vboxSfDwnConnect(void)
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| 103 | {
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| 104 | /*
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| 105 | * Grab VBoxGuest - since it's a dependency of this module, it shouldn't be hard.
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| 106 | */
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| 107 | if (!g_pVBoxGuest)
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| 108 | {
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| 109 | OSDictionary *pServiceMatcher = IOService::serviceMatching("org_virtualbox_VBoxGuest");
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| 110 | if (pServiceMatcher)
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| 111 | {
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| 112 | IOService *pVBoxGuest = IOService::waitForMatchingService(pServiceMatcher, 10 * RT_NS_1SEC);
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| 113 | if (pVBoxGuest)
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| 114 | g_pVBoxGuest = pVBoxGuest;
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| 115 | else
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| 116 | LogRel(("vboxSfDwnConnect: IOService::waitForMatchingService failed!!\n"));
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| 117 | }
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| 118 | else
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| 119 | LogRel(("vboxSfDwnConnect: serviceMatching failed\n"));
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| 120 | }
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| 121 |
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| 122 | if (g_pVBoxGuest)
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| 123 | {
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| 124 | /*
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| 125 | * Get hold of the shared folders service if we haven't already.
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| 126 | */
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| 127 | if (g_SfClientDarwin.handle != NULL)
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| 128 | return true;
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| 129 |
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| 130 | int rc = VbglR0SfConnect(&g_SfClientDarwin);
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| 131 | if (RT_SUCCESS(rc))
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| 132 | {
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| 133 | rc = VbglR0SfSetUtf8(&g_SfClientDarwin);
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| 134 | if (RT_SUCCESS(rc))
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| 135 | return true;
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| 136 |
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| 137 | LogRel(("VBoxSF: VbglR0SfSetUtf8 failed: %Rrc\n", rc));
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| 138 |
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| 139 | VbglR0SfDisconnect(&g_SfClientDarwin);
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| 140 | g_SfClientDarwin.handle = NULL;
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| 141 | }
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| 142 | else
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| 143 | LogRel(("VBoxSF: VbglR0SfConnect failed: %Rrc\n", rc));
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| 144 | }
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| 145 |
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| 146 | return false;
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| 147 | }
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| 148 |
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| 149 |
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| 150 | /**
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| 151 | * Start the kernel module.
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| 152 | */
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| 153 | static kern_return_t vboxSfDwnModuleLoad(struct kmod_info *pKModInfo, void *pvData)
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| 154 | {
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| 155 | RT_NOREF(pKModInfo, pvData);
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| 156 | #ifdef DEBUG
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| 157 | printf("vboxSfDwnModuleLoad\n");
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| 158 | RTLogBackdoorPrintf("vboxSfDwnModuleLoad\n");
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| 159 | #endif
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| 160 |
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| 161 | /*
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| 162 | * Initialize IPRT and the ring-0 guest library.
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| 163 | */
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| 164 | int rc = RTR0Init(0);
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| 165 | if (RT_SUCCESS(rc))
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| 166 | {
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| 167 | rc = VbglR0SfInit();
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| 168 | if (RT_SUCCESS(rc))
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| 169 | {
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| 170 | /*
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| 171 | * Register the file system.
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| 172 | */
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| 173 | rc = vfs_fsadd(&g_VBoxSfFsEntry, &g_pVBoxSfVfsTableEntry);
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| 174 | if (rc == 0)
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| 175 | {
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| 176 | /*
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| 177 | * Try find VBoxGuest and connect to the shared folders service on the host.
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| 178 | */
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| 179 | /** @todo should we just ignore the error here and retry at mount time?
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| 180 | * Technically, VBoxGuest should be available since it's one of our
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| 181 | * dependencies... */
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| 182 | vboxSfDwnConnect();
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| 183 |
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| 184 | /*
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| 185 | * We're done for now. We'll deal with
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| 186 | */
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| 187 | LogRel(("VBoxSF: loaded\n"));
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| 188 | return KERN_SUCCESS;
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| 189 | }
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| 190 |
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| 191 | printf("VBoxSF: vfs_fsadd failed: %d\n", rc);
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| 192 | RTLogBackdoorPrintf("VBoxSF: vfs_fsadd failed: %d\n", rc);
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| 193 | VbglR0SfTerm();
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| 194 | }
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| 195 | else
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| 196 | {
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| 197 | printf("VBoxSF: VbglR0SfInit failed: %d\n", rc);
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| 198 | RTLogBackdoorPrintf("VBoxSF: VbglR0SfInit failed: %Rrc\n", rc);
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| 199 | }
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| 200 | RTR0Term();
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| 201 | }
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| 202 | else
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| 203 | {
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| 204 | printf("VBoxSF: RTR0Init failed: %d\n", rc);
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| 205 | RTLogBackdoorPrintf("VBoxSF: RTR0Init failed: %Rrc\n", rc);
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| 206 | }
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| 207 | return KERN_FAILURE;
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| 208 | }
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| 209 |
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| 210 |
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| 211 | /**
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| 212 | * Stop the kernel module.
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| 213 | */
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| 214 | static kern_return_t vboxSfDwnModuleUnload(struct kmod_info *pKModInfo, void *pvData)
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| 215 | {
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| 216 | RT_NOREF(pKModInfo, pvData);
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| 217 | #ifdef DEBUG
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| 218 | printf("vboxSfDwnModuleUnload\n");
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| 219 | RTLogBackdoorPrintf("vboxSfDwnModuleUnload\n");
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| 220 | #endif
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| 221 |
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| 222 |
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| 223 | /*
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| 224 | * Are we busy? If so fail. Otherwise try deregister the file system.
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| 225 | */
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| 226 | if (g_cVBoxSfMounts > 0)
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| 227 | {
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| 228 | LogRel(("VBoxSF: Refusing to unload with %u active mounts\n", g_cVBoxSfMounts));
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| 229 | return KERN_NO_ACCESS;
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| 230 | }
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| 231 |
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| 232 | if (g_pVBoxSfVfsTableEntry)
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| 233 | {
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| 234 | int rc = vfs_fsremove(g_pVBoxSfVfsTableEntry);
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| 235 | if (rc != 0)
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| 236 | {
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| 237 | LogRel(("VBoxSF: vfs_fsremove failed: %d\n", rc));
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| 238 | return KERN_NO_ACCESS;
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| 239 | }
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| 240 | }
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| 241 |
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| 242 | /*
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| 243 | * Disconnect and terminate libraries we're using.
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| 244 | */
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| 245 | if (g_SfClientDarwin.handle != NULL)
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| 246 | {
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| 247 | VbglR0SfDisconnect(&g_SfClientDarwin);
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| 248 | g_SfClientDarwin.handle = NULL;
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| 249 | }
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| 250 |
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| 251 | if (g_pVBoxGuest)
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| 252 | {
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| 253 | g_pVBoxGuest->release();
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| 254 | g_pVBoxGuest = NULL;
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| 255 | }
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| 256 |
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| 257 | VbglR0SfTerm();
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| 258 | RTR0Term();
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| 259 | return KERN_SUCCESS;
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| 260 | }
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| 261 |
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