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75ae8daf8f06668a43ab1b0bc92189ea6052ca2c
winfsp/src/dll/fuse/fuse.c
Bill Zissimopoulos 75ae8daf8f update commercial disclaimer
2018-08-21 18:09:33 -07:00

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/**
* @file dll/fuse/fuse.c
*
* @copyright 2015-2018 Bill Zissimopoulos
*/
/*
* This file is part of WinFsp.
*
* You can redistribute it and/or modify it under the terms of the GNU
* General Public License version 3 as published by the Free Software
* Foundation.
*
* Licensees holding a valid commercial license may use this software
* in accordance with the commercial license agreement provided in
* conjunction with the software. The terms and conditions of any such
* commercial license agreement shall govern, supersede, and render
* ineffective any application of the GPLv3 license to this software,
* notwithstanding of any reference thereto in the software or
* associated repository.
*/
#include <dll/fuse/library.h>
struct fuse_chan
{
PWSTR MountPoint;
UINT8 Buffer[];
};
#define FSP_FUSE_CORE_OPT(n, f, v) { n, offsetof(struct fsp_fuse_core_opt_data, f), v }
#define FSP_FUSE_CORE_OPT_NOHELP_IDX 4
static struct fuse_opt fsp_fuse_core_opts[] =
{
FUSE_OPT_KEY("-h", 'h'),
FUSE_OPT_KEY("--help", 'h'),
FUSE_OPT_KEY("-V", 'V'),
FUSE_OPT_KEY("--version", 'V'),
FUSE_OPT_KEY("-d", FUSE_OPT_KEY_KEEP),
FUSE_OPT_KEY("debug", FUSE_OPT_KEY_KEEP),
FSP_FUSE_CORE_OPT("-d", debug, 1),
FSP_FUSE_CORE_OPT("debug", debug, 1),
FUSE_OPT_KEY("DebugLog=", 'D'),
FUSE_OPT_KEY("hard_remove", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("use_ino", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("readdir_ino", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("direct_io", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("kernel_cache", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("auto_cache", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("noauto_cache", FUSE_OPT_KEY_DISCARD),
FSP_FUSE_CORE_OPT("umask=", set_umask, 1),
FSP_FUSE_CORE_OPT("umask=%o", umask, 0),
FSP_FUSE_CORE_OPT("create_umask=", set_create_umask, 1),
FSP_FUSE_CORE_OPT("create_umask=%o", create_umask, 0),
FSP_FUSE_CORE_OPT("uid=", set_uid, 1),
FSP_FUSE_CORE_OPT("uid=%d", uid, 0),
FSP_FUSE_CORE_OPT("gid=", set_gid, 1),
FSP_FUSE_CORE_OPT("gid=%d", gid, 0),
FUSE_OPT_KEY("entry_timeout", FUSE_OPT_KEY_DISCARD),
FSP_FUSE_CORE_OPT("attr_timeout=", set_attr_timeout, 1),
FSP_FUSE_CORE_OPT("attr_timeout=%d", attr_timeout, 0),
FUSE_OPT_KEY("ac_attr_timeout", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("negative_timeout", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("noforget", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("intr", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("intr_signal=", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("modules=", FUSE_OPT_KEY_DISCARD),
FSP_FUSE_CORE_OPT("rellinks", rellinks, 1),
FSP_FUSE_CORE_OPT("norellinks", rellinks, 0),
FUSE_OPT_KEY("fstypename=", 'F'),
FUSE_OPT_KEY("volname=", 'v'),
FSP_FUSE_CORE_OPT("SectorSize=%hu", VolumeParams.SectorSize, 4096),
FSP_FUSE_CORE_OPT("SectorsPerAllocationUnit=%hu", VolumeParams.SectorsPerAllocationUnit, 1),
FSP_FUSE_CORE_OPT("MaxComponentLength=%hu", VolumeParams.MaxComponentLength, 0),
FSP_FUSE_CORE_OPT("VolumeCreationTime=%lli", VolumeParams.VolumeCreationTime, 0),
FSP_FUSE_CORE_OPT("VolumeSerialNumber=%lx", VolumeParams.VolumeSerialNumber, 0),
FSP_FUSE_CORE_OPT("FileInfoTimeout=", set_FileInfoTimeout, 1),
FSP_FUSE_CORE_OPT("FileInfoTimeout=%d", VolumeParams.FileInfoTimeout, 0),
FSP_FUSE_CORE_OPT("DirInfoTimeout=", set_DirInfoTimeout, 1),
FSP_FUSE_CORE_OPT("DirInfoTimeout=%d", VolumeParams.DirInfoTimeout, 0),
FSP_FUSE_CORE_OPT("VolumeInfoTimeout=", set_VolumeInfoTimeout, 1),
FSP_FUSE_CORE_OPT("VolumeInfoTimeout=%d", VolumeParams.VolumeInfoTimeout, 0),
FSP_FUSE_CORE_OPT("KeepFileCache=", set_KeepFileCache, 1),
FSP_FUSE_CORE_OPT("ThreadCount=%u", ThreadCount, 0),
FUSE_OPT_KEY("UNC=", 'U'),
FUSE_OPT_KEY("--UNC=", 'U'),
FUSE_OPT_KEY("VolumePrefix=", 'U'),
FUSE_OPT_KEY("--VolumePrefix=", 'U'),
FUSE_OPT_KEY("FileSystemName=", 'F'),
FUSE_OPT_KEY("--FileSystemName=", 'F'),
FUSE_OPT_END,
};
static INIT_ONCE fsp_fuse_initonce = INIT_ONCE_STATIC_INIT;
DWORD fsp_fuse_tlskey = TLS_OUT_OF_INDEXES;
static BOOL WINAPI fsp_fuse_initialize(
PINIT_ONCE InitOnce, PVOID Parameter, PVOID *Context)
{
fsp_fuse_tlskey = TlsAlloc();
return TRUE;
}
VOID fsp_fuse_finalize(BOOLEAN Dynamic)
{
/*
* This function is called during DLL_PROCESS_DETACH. We must therefore keep
* finalization tasks to a minimum.
*
* We must free our TLS key (if any). We only do so if the library
* is being explicitly unloaded (rather than the process exiting).
*/
if (Dynamic && TLS_OUT_OF_INDEXES != fsp_fuse_tlskey)
{
/* !!!:
* We should also free all thread local contexts, which means putting them in a list,
* protected with a critical section, etc. Arghhh!
*
* I am too lazy and I am not going to do that, unless people start using this
* DLL dynamically (LoadLibrary/FreeLibrary).
*/
TlsFree(fsp_fuse_tlskey);
}
}
VOID fsp_fuse_finalize_thread(VOID)
{
struct fuse_context *context;
if (TLS_OUT_OF_INDEXES != fsp_fuse_tlskey)
{
context = TlsGetValue(fsp_fuse_tlskey);
if (0 != context)
{
fsp_fuse_obj_free(FSP_FUSE_HDR_FROM_CONTEXT(context));
TlsSetValue(fsp_fuse_tlskey, 0);
}
}
}
FSP_FUSE_API int fsp_fuse_version(struct fsp_fuse_env *env)
{
return FUSE_VERSION;
}
FSP_FUSE_API struct fuse_chan *fsp_fuse_mount(struct fsp_fuse_env *env,
const char *mountpoint, struct fuse_args *args)
{
struct fuse_chan *ch = 0;
WCHAR TempMountPointBuf[MAX_PATH], MountPointBuf[MAX_PATH];
int Size;
if (0 == mountpoint || '\0' == mountpoint[0] ||
('*' == mountpoint[0] && '\0' == mountpoint[1]))
{
MountPointBuf[0] = L'*';
MountPointBuf[1] = L'\0';
Size = 2 * sizeof(WCHAR);
}
else if (
(
('A' <= mountpoint[0] && mountpoint[0] <= 'Z') ||
('a' <= mountpoint[0] && mountpoint[0] <= 'z')
) &&
':' == mountpoint[1] && '\0' == mountpoint[2])
{
MountPointBuf[0] = mountpoint[0];
MountPointBuf[1] = ':';
MountPointBuf[2] = '\0';
Size = 3 * sizeof(WCHAR);
}
else
{
char *win_mountpoint = 0;
if (0 != env->conv_to_win_path)
mountpoint = win_mountpoint = env->conv_to_win_path(mountpoint);
Size = 0;
if (0 != mountpoint &&
0 != MultiByteToWideChar(CP_UTF8, 0, mountpoint, -1, TempMountPointBuf, MAX_PATH))
Size = GetFullPathNameW(TempMountPointBuf, MAX_PATH, MountPointBuf, 0);
env->memfree(win_mountpoint);
if (0 == Size || MAX_PATH <= Size)
goto fail;
mountpoint = 0;
Size = (Size + 1) * sizeof(WCHAR);
}
ch = fsp_fuse_obj_alloc(env, sizeof *ch + Size);
if (0 == ch)
goto fail;
ch->MountPoint = (PVOID)ch->Buffer;
memcpy(ch->MountPoint, MountPointBuf, Size);
return ch;
fail:
fsp_fuse_obj_free(ch);
return 0;
}
FSP_FUSE_API void fsp_fuse_unmount(struct fsp_fuse_env *env,
const char *mountpoint, struct fuse_chan *ch)
{
fsp_fuse_obj_free(ch);
}
FSP_FUSE_API int fsp_fuse_is_lib_option(struct fsp_fuse_env *env,
const char *opt)
{
return fsp_fuse_opt_match(env, fsp_fuse_core_opts, opt);
}
static int fsp_fuse_core_opt_proc(void *opt_data0, const char *arg, int key,
struct fuse_args *outargs)
{
struct fsp_fuse_core_opt_data *opt_data = opt_data0;
switch (key)
{
default:
return 1;
case 'h':
/* Note: The limit on FspServiceLog messages is 1024 bytes. */
FspServiceLog(EVENTLOG_ERROR_TYPE, L""
FSP_FUSE_LIBRARY_NAME " options:\n"
" -o umask=MASK set file permissions (octal)\n"
" -o create_umask=MASK set newly created file permissions (octal)\n"
" -o uid=N set file owner (-1 for mounting user id)\n"
" -o gid=N set file group (-1 for mounting user group)\n"
" -o rellinks interpret absolute symlinks as volume relative\n"
" -o volname=NAME set volume label\n"
" -o VolumePrefix=UNC set UNC prefix (/Server/Share)\n"
" --VolumePrefix=UNC set UNC prefix (\\Server\\Share)\n"
" -o FileSystemName=NAME set file system name\n"
" -o DebugLog=FILE debug log file (requires -d)\n"
);
FspServiceLog(EVENTLOG_ERROR_TYPE, L""
FSP_FUSE_LIBRARY_NAME " advanced options:\n"
" -o FileInfoTimeout=N metadata timeout (millis, -1 for data caching)\n"
" -o DirInfoTimeout=N directory info timeout (millis)\n"
" -o VolumeInfoTimeout=N volume info timeout (millis)\n"
" -o KeepFileCache do not discard cache when files are closed\n"
" -o ThreadCount number of file system dispatcher threads\n"
);
opt_data->help = 1;
return 1;
case 'V':
FspServiceLog(EVENTLOG_ERROR_TYPE, L""
FSP_FUSE_LIBRARY_NAME " version %d.%d",
FUSE_MAJOR_VERSION, FUSE_MINOR_VERSION);
opt_data->help = 1;
return 1;
case 'D':
arg += sizeof "DebugLog=" - 1;
opt_data->DebugLogHandle = CreateFileA(
arg,
FILE_APPEND_DATA,
FILE_SHARE_READ | FILE_SHARE_WRITE,
0,
OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
0);
return 0;
case 'U':
if ('U' == arg[0])
arg += sizeof "UNC=" - 1;
else if ('U' == arg[2])
arg += sizeof "--UNC=" - 1;
else if ('V' == arg[0])
arg += sizeof "VolumePrefix=" - 1;
else if ('V' == arg[2])
arg += sizeof "--VolumePrefix=" - 1;
if (0 == MultiByteToWideChar(CP_UTF8, 0, arg, -1,
opt_data->VolumeParams.Prefix, sizeof opt_data->VolumeParams.Prefix / sizeof(WCHAR)))
return -1;
opt_data->VolumeParams.Prefix
[sizeof opt_data->VolumeParams.Prefix / sizeof(WCHAR) - 1] = L'\0';
for (PWSTR P = opt_data->VolumeParams.Prefix; *P; P++)
if (L'/' == *P)
*P = '\\';
return 0;
case 'F':
if ('f' == arg[0])
arg += sizeof "fstypename=" - 1;
else if ('F' == arg[0])
arg += sizeof "FileSystemName=" - 1;
else if ('F' == arg[2])
arg += sizeof "--FileSystemName=" - 1;
if (0 == MultiByteToWideChar(CP_UTF8, 0, arg, -1,
opt_data->VolumeParams.FileSystemName + 5,
sizeof opt_data->VolumeParams.FileSystemName / sizeof(WCHAR) - 5))
return -1;
opt_data->VolumeParams.FileSystemName
[sizeof opt_data->VolumeParams.FileSystemName / sizeof(WCHAR) - 1] = L'\0';
memcpy(opt_data->VolumeParams.FileSystemName, L"FUSE-", 5 * sizeof(WCHAR));
return 0;
case 'v':
arg += sizeof "volname=" - 1;
opt_data->VolumeLabelLength = (UINT16)(sizeof(WCHAR) *
MultiByteToWideChar(CP_UTF8, 0, arg, lstrlenA(arg),
opt_data->VolumeLabel, sizeof opt_data->VolumeLabel / sizeof(WCHAR)));
if (0 == opt_data->VolumeLabelLength)
return -1;
return 0;
}
}
int fsp_fuse_core_opt_parse(struct fsp_fuse_env *env,
struct fuse_args *args, struct fsp_fuse_core_opt_data *opt_data,
int help)
{
if (help)
return fsp_fuse_opt_parse(env, args, opt_data,
fsp_fuse_core_opts, fsp_fuse_core_opt_proc);
else
return fsp_fuse_opt_parse(env, args, opt_data,
fsp_fuse_core_opts + FSP_FUSE_CORE_OPT_NOHELP_IDX, fsp_fuse_core_opt_proc);
}
FSP_FUSE_API struct fuse *fsp_fuse_new(struct fsp_fuse_env *env,
struct fuse_chan *ch, struct fuse_args *args,
const struct fuse_operations *ops, size_t opsize, void *data)
{
struct fuse *f = 0;
struct fsp_fuse_core_opt_data opt_data;
ULONG Size;
PWSTR ErrorMessage = L".";
NTSTATUS Result;
if (opsize > sizeof(struct fuse_operations))
opsize = sizeof(struct fuse_operations);
memset(&opt_data, 0, sizeof opt_data);
opt_data.env = env;
opt_data.DebugLogHandle = GetStdHandle(STD_ERROR_HANDLE);
opt_data.VolumeParams.Version = sizeof(FSP_FSCTL_VOLUME_PARAMS);
opt_data.VolumeParams.FileInfoTimeout = 1000;
opt_data.VolumeParams.FlushAndPurgeOnCleanup = TRUE;
if (-1 == fsp_fuse_core_opt_parse(env, args, &opt_data, /*help=*/1))
return 0;
if (opt_data.help)
return 0;
if (opt_data.debug)
{
if (INVALID_HANDLE_VALUE == opt_data.DebugLogHandle)
{
ErrorMessage = L": cannot open debug log file.";
goto fail;
}
FspDebugLogSetHandle(opt_data.DebugLogHandle);
}
if ((opt_data.set_uid && -1 == opt_data.uid) ||
(opt_data.set_gid && -1 == opt_data.gid))
{
HANDLE Token;
if (OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &Token))
{
fsp_fuse_get_token_uidgid(Token, TokenUser,
opt_data.set_uid && -1 == opt_data.uid ? &opt_data.uid : 0,
opt_data.set_gid && -1 == opt_data.gid ? &opt_data.gid : 0);
CloseHandle(Token);
}
if ((opt_data.set_uid && -1 == opt_data.uid) ||
(opt_data.set_gid && -1 == opt_data.gid))
{
ErrorMessage = L": unknown user/group.";
goto fail;
}
}
if (!opt_data.set_FileInfoTimeout && opt_data.set_attr_timeout)
opt_data.VolumeParams.FileInfoTimeout = opt_data.attr_timeout * 1000;
if (opt_data.set_DirInfoTimeout)
opt_data.VolumeParams.DirInfoTimeoutValid = 1;
if (opt_data.set_VolumeInfoTimeout)
opt_data.VolumeParams.VolumeInfoTimeoutValid = 1;
if (opt_data.set_KeepFileCache)
opt_data.VolumeParams.FlushAndPurgeOnCleanup = FALSE;
opt_data.VolumeParams.CaseSensitiveSearch = TRUE;
opt_data.VolumeParams.CasePreservedNames = TRUE;
opt_data.VolumeParams.PersistentAcls = TRUE;
opt_data.VolumeParams.ReparsePoints = TRUE;
opt_data.VolumeParams.ReparsePointsAccessCheck = FALSE;
opt_data.VolumeParams.NamedStreams = FALSE;
opt_data.VolumeParams.ReadOnlyVolume = FALSE;
opt_data.VolumeParams.PostCleanupWhenModifiedOnly = TRUE;
opt_data.VolumeParams.PassQueryDirectoryFileName = TRUE;
opt_data.VolumeParams.DeviceControl = TRUE;
opt_data.VolumeParams.UmFileContextIsUserContext2 = TRUE;
if (L'\0' == opt_data.VolumeParams.FileSystemName[0])
memcpy(opt_data.VolumeParams.FileSystemName, L"FUSE", 5 * sizeof(WCHAR));
f = fsp_fuse_obj_alloc(env, sizeof *f);
if (0 == f)
goto fail;
f->env = env;
f->set_umask = opt_data.set_umask; f->umask = opt_data.umask;
f->set_create_umask = opt_data.set_create_umask; f->create_umask = opt_data.create_umask;
f->set_uid = opt_data.set_uid; f->uid = opt_data.uid;
f->set_gid = opt_data.set_gid; f->gid = opt_data.gid;
f->rellinks = opt_data.rellinks;
f->ThreadCount = opt_data.ThreadCount;
memcpy(&f->ops, ops, opsize);
f->data = data;
f->DebugLog = opt_data.debug ? -1 : 0;
memcpy(&f->VolumeParams, &opt_data.VolumeParams, sizeof opt_data.VolumeParams);
f->VolumeLabelLength = opt_data.VolumeLabelLength;
memcpy(&f->VolumeLabel, &opt_data.VolumeLabel, opt_data.VolumeLabelLength);
Size = (lstrlenW(ch->MountPoint) + 1) * sizeof(WCHAR);
f->MountPoint = fsp_fuse_obj_alloc(env, Size);
if (0 == f->MountPoint)
goto fail;
memcpy(f->MountPoint, ch->MountPoint, Size);
Result = FspFileSystemPreflight(
f->VolumeParams.Prefix[0] ? L"" FSP_FSCTL_NET_DEVICE_NAME : L"" FSP_FSCTL_DISK_DEVICE_NAME,
'*' != f->MountPoint[0] || '\0' != f->MountPoint[1] ? f->MountPoint : 0);
if (!NT_SUCCESS(Result))
{
switch (Result)
{
case STATUS_ACCESS_DENIED:
ErrorMessage = L": access denied.";
break;
case STATUS_NO_SUCH_DEVICE:
ErrorMessage = L": FSD not found.";
break;
case STATUS_OBJECT_NAME_INVALID:
ErrorMessage = L": invalid mount point.";
break;
case STATUS_OBJECT_NAME_COLLISION:
ErrorMessage = L": mount point in use.";
break;
default:
ErrorMessage = L": unspecified error.";
break;
}
goto fail;
}
return f;
fail:
FspServiceLog(EVENTLOG_ERROR_TYPE,
L"Cannot create " FSP_FUSE_LIBRARY_NAME " file system%s",
ErrorMessage);
if (0 != f)
fsp_fuse_destroy(env, f);
return 0;
}
FSP_FUSE_API void fsp_fuse_destroy(struct fsp_fuse_env *env,
struct fuse *f)
{
fsp_fuse_obj_free(f->MountPoint);
fsp_fuse_obj_free(f);
}
FSP_FUSE_API void fsp_fuse_exit(struct fsp_fuse_env *env,
struct fuse *f)
{
if (0 != f->LoopEvent)
SetEvent(f->LoopEvent);
f->exited = 1;
}
FSP_FUSE_API int FSP_FUSE_API_NAME(fsp_fuse_exited)(struct fsp_fuse_env *env,
struct fuse *f)
{
return f->exited;
}
FSP_FUSE_API struct fuse_context *fsp_fuse_get_context(struct fsp_fuse_env *env)
{
struct fuse_context *context;
InitOnceExecuteOnce(&fsp_fuse_initonce, fsp_fuse_initialize, 0, 0);
if (TLS_OUT_OF_INDEXES == fsp_fuse_tlskey)
return 0;
context = TlsGetValue(fsp_fuse_tlskey);
if (0 == context)
{
struct fsp_fuse_context_header *contexthdr;
contexthdr = fsp_fuse_obj_alloc(env,
sizeof(struct fsp_fuse_context_header) + sizeof(struct fuse_context));
if (0 == contexthdr)
return 0;
context = FSP_FUSE_CONTEXT_FROM_HDR(contexthdr);
TlsSetValue(fsp_fuse_tlskey, context);
}
return context;
}
FSP_FUSE_API int32_t fsp_fuse_ntstatus_from_errno(struct fsp_fuse_env *env,
int err)
{
if (0 > err)
err = -err;
if ('C' == env->environment)
switch (err)
{
#undef FSP_FUSE_ERRNO
#define FSP_FUSE_ERRNO 67
#include "errno.i"
default:
return STATUS_ACCESS_DENIED;
}
else
switch (err)
{
#undef FSP_FUSE_ERRNO
#define FSP_FUSE_ERRNO 87
#include "errno.i"
default:
return STATUS_ACCESS_DENIED;
}
}
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