* autoload.cc (CreateSymbolicLink): Define.
* environ.cc (set_winsymlinks): Set allow_winsymlinks. (parse_thing): Change "winsymlinks" to set by function. * globals.cc (enum winsym_t): Define. (allow_winsymlinks): Define as winsym_t. (ro_u_afs): New R/O Unicode string. * mount.cc (fs_info::update): Fix comment. Handle AFS. (fs_names): Add "afs". * mount.h (enum fs_info_type): Add afs. (class fs_info): Implement afs. * path.cc (symlink): Drop third parameter in call to symlink_worker. (symlink_nfs): New function. (symlink_native): New function. (symlink_worker): Drop third argument. Handle native symlink type by calling symlink_native. Move code to handle NFS to symlink_nfs. Fix formatting. Slightly restructure code. * path.h (class path_conv): Add fs_is_afs method. (symlink_worker): Declare here. * security.h: Define privilege constants as unsigned int instead of as unsigned long. * syscalls.cc (mknod_worker): Set third parameter in symlink_worker call to WSYM_lnk. * winsup.h (symlink_worker): Drop declaration here.
This commit is contained in:
@ -1475,27 +1475,98 @@ conv_path_list (const char *src, char *dst, size_t size,
|
||||
extern "C" int
|
||||
symlink (const char *oldpath, const char *newpath)
|
||||
{
|
||||
return symlink_worker (oldpath, newpath, allow_winsymlinks, false);
|
||||
return symlink_worker (oldpath, newpath, false);
|
||||
}
|
||||
|
||||
static int
|
||||
symlink_nfs (const char *oldpath, path_conv &win32_newpath)
|
||||
{
|
||||
/* On NFS, create symlinks by calling NtCreateFile with an EA of type
|
||||
NfsSymlinkTargetName containing ... the symlink target name. */
|
||||
tmp_pathbuf tp;
|
||||
PFILE_FULL_EA_INFORMATION pffei;
|
||||
NTSTATUS status;
|
||||
HANDLE fh;
|
||||
OBJECT_ATTRIBUTES attr;
|
||||
IO_STATUS_BLOCK io;
|
||||
|
||||
pffei = (PFILE_FULL_EA_INFORMATION) tp.w_get ();
|
||||
pffei->NextEntryOffset = 0;
|
||||
pffei->Flags = 0;
|
||||
pffei->EaNameLength = sizeof (NFS_SYML_TARGET) - 1;
|
||||
char *EaValue = stpcpy (pffei->EaName, NFS_SYML_TARGET) + 1;
|
||||
pffei->EaValueLength = sizeof (WCHAR) *
|
||||
(sys_mbstowcs ((PWCHAR) EaValue, NT_MAX_PATH, oldpath) - 1);
|
||||
status = NtCreateFile (&fh, FILE_WRITE_DATA | FILE_WRITE_EA | SYNCHRONIZE,
|
||||
win32_newpath.get_object_attr (attr, sec_none_nih),
|
||||
&io, NULL, FILE_ATTRIBUTE_SYSTEM,
|
||||
FILE_SHARE_VALID_FLAGS, FILE_CREATE,
|
||||
FILE_SYNCHRONOUS_IO_NONALERT
|
||||
| FILE_OPEN_FOR_BACKUP_INTENT,
|
||||
pffei, NT_MAX_PATH * sizeof (WCHAR));
|
||||
if (!NT_SUCCESS (status))
|
||||
{
|
||||
__seterrno_from_nt_status (status);
|
||||
return -1;
|
||||
}
|
||||
NtClose (fh);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
symlink_native (const char *oldpath, path_conv &win32_newpath)
|
||||
{
|
||||
tmp_pathbuf tp;
|
||||
path_conv win32_oldpath;
|
||||
PUNICODE_STRING final_oldpath, final_newpath;
|
||||
|
||||
if (isabspath (oldpath))
|
||||
{
|
||||
win32_oldpath.check (oldpath, PC_SYM_NOFOLLOW, stat_suffixes);
|
||||
final_oldpath = win32_oldpath.get_nt_native_path ();
|
||||
final_oldpath->Buffer[1] = L'\\';
|
||||
}
|
||||
else
|
||||
{
|
||||
/* The symlink target is relative to the directory in which
|
||||
the symlink gets created, not relative to the cwd. Therefore
|
||||
we have to mangle the path quite a bit before calling path_conv. */
|
||||
ssize_t len = strrchr (win32_newpath.normalized_path, '/')
|
||||
- win32_newpath.normalized_path + 1;
|
||||
char *absoldpath = tp.t_get ();
|
||||
stpcpy (stpncpy (absoldpath, win32_newpath.normalized_path, len),
|
||||
oldpath);
|
||||
win32_oldpath.check (absoldpath, PC_SYM_NOFOLLOW, stat_suffixes);
|
||||
UNICODE_STRING dirpath;
|
||||
RtlSplitUnicodePath (win32_newpath.get_nt_native_path (), &dirpath, NULL);
|
||||
final_oldpath = win32_oldpath.get_nt_native_path ();
|
||||
final_oldpath->Buffer += dirpath.Length / sizeof (WCHAR);
|
||||
}
|
||||
final_newpath = win32_newpath.get_nt_native_path ();
|
||||
/* Convert native to DOS UNC path. */
|
||||
final_newpath->Buffer[1] = L'\\';
|
||||
if (!CreateSymbolicLinkW (final_newpath->Buffer, final_oldpath->Buffer,
|
||||
win32_oldpath.isdir ()
|
||||
? SYMBOLIC_LINK_FLAG_DIRECTORY : 0))
|
||||
{
|
||||
/* Repair native path, we still need it. */
|
||||
final_newpath->Buffer[1] = L'?';
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
bool isdevice)
|
||||
symlink_worker (const char *oldpath, const char *newpath, bool isdevice)
|
||||
{
|
||||
int res = -1;
|
||||
size_t len;
|
||||
path_conv win32_newpath, win32_oldpath;
|
||||
path_conv win32_newpath;
|
||||
char *buf, *cp;
|
||||
SECURITY_ATTRIBUTES sa = sec_none_nih;
|
||||
OBJECT_ATTRIBUTES attr;
|
||||
IO_STATUS_BLOCK io;
|
||||
NTSTATUS status;
|
||||
HANDLE fh;
|
||||
ULONG access = DELETE | FILE_GENERIC_WRITE;
|
||||
tmp_pathbuf tp;
|
||||
unsigned check_opt;
|
||||
bool mk_winsym = use_winsym;
|
||||
bool has_trailing_dirsep = false;
|
||||
winsym_t wsym_type;
|
||||
|
||||
/* POSIX says that empty 'newpath' is invalid input while empty
|
||||
'oldpath' is valid -- it's symlink resolver job to verify if
|
||||
@ -1527,11 +1598,35 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
check_opt = PC_SYM_NOFOLLOW | PC_POSIX | (isdevice ? PC_NOWARN : 0);
|
||||
/* We need the normalized full path below. */
|
||||
win32_newpath.check (newpath, check_opt, stat_suffixes);
|
||||
|
||||
/* Default symlink type is determined by global allow_winsymlinks variable.
|
||||
Device files are always shortcuts. */
|
||||
wsym_type = isdevice ? WSYM_lnk : allow_winsymlinks;
|
||||
/* NFS has its own, dedicated way to create symlinks. */
|
||||
if (win32_newpath.fs_is_nfs ())
|
||||
wsym_type = WSYM_nfs;
|
||||
/* MVFS doesn't handle the SYSTEM DOS attribute, but it handles the R/O
|
||||
attribute. Therefore we create symlinks on MVFS always as shortcuts. */
|
||||
mk_winsym |= win32_newpath.fs_is_mvfs ();
|
||||
else if (win32_newpath.fs_is_mvfs ())
|
||||
wsym_type = WSYM_lnk;
|
||||
/* AFS only supports native symlinks. */
|
||||
else if (win32_newpath.fs_is_afs ())
|
||||
{
|
||||
/* Bail out if OS doesn't support native symlinks. */
|
||||
if (wincap.max_sys_priv () < SE_CREATE_SYMBOLIC_LINK_PRIVILEGE)
|
||||
{
|
||||
set_errno (EPERM);
|
||||
goto done;
|
||||
}
|
||||
wsym_type = WSYM_native;
|
||||
}
|
||||
/* Don't try native symlinks on filesystems not supporting reparse points. */
|
||||
else if (wsym_type == WSYM_native
|
||||
&& !(win32_newpath.fs_flags () & FILE_SUPPORTS_REPARSE_POINTS))
|
||||
wsym_type = WSYM_sysfile;
|
||||
|
||||
if (mk_winsym && !win32_newpath.exists ()
|
||||
/* Attach .lnk suffix when shortcut is requested. */
|
||||
if (wsym_type == WSYM_lnk && !win32_newpath.exists ()
|
||||
&& (isdevice || !win32_newpath.fs_is_nfs ()))
|
||||
{
|
||||
char *newplnk = tp.c_get ();
|
||||
@ -1545,8 +1640,8 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
goto done;
|
||||
}
|
||||
|
||||
syscall_printf ("symlink (%s, %S)", oldpath,
|
||||
win32_newpath.get_nt_native_path ());
|
||||
syscall_printf ("symlink (%s, %S) wsym_type %d", oldpath,
|
||||
win32_newpath.get_nt_native_path (), wsym_type);
|
||||
|
||||
if ((!isdevice && win32_newpath.exists ())
|
||||
|| win32_newpath.is_auto_device ())
|
||||
@ -1560,36 +1655,29 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (!isdevice && win32_newpath.fs_is_nfs ())
|
||||
/* Handle NFS and native symlinks in their own functions. */
|
||||
switch (wsym_type)
|
||||
{
|
||||
/* On NFS, create symlinks by calling NtCreateFile with an EA of type
|
||||
NfsSymlinkTargetName containing ... the symlink target name. */
|
||||
PFILE_FULL_EA_INFORMATION pffei = (PFILE_FULL_EA_INFORMATION) tp.w_get ();
|
||||
pffei->NextEntryOffset = 0;
|
||||
pffei->Flags = 0;
|
||||
pffei->EaNameLength = sizeof (NFS_SYML_TARGET) - 1;
|
||||
char *EaValue = stpcpy (pffei->EaName, NFS_SYML_TARGET) + 1;
|
||||
pffei->EaValueLength = sizeof (WCHAR) *
|
||||
(sys_mbstowcs ((PWCHAR) EaValue, NT_MAX_PATH, oldpath) - 1);
|
||||
status = NtCreateFile (&fh, FILE_WRITE_DATA | FILE_WRITE_EA | SYNCHRONIZE,
|
||||
win32_newpath.get_object_attr (attr, sa),
|
||||
&io, NULL, FILE_ATTRIBUTE_SYSTEM,
|
||||
FILE_SHARE_VALID_FLAGS, FILE_CREATE,
|
||||
FILE_SYNCHRONOUS_IO_NONALERT
|
||||
| FILE_OPEN_FOR_BACKUP_INTENT,
|
||||
pffei, NT_MAX_PATH * sizeof (WCHAR));
|
||||
if (!NT_SUCCESS (status))
|
||||
case WSYM_nfs:
|
||||
res = symlink_nfs (oldpath, win32_newpath);
|
||||
goto done;
|
||||
case WSYM_native:
|
||||
res = symlink_native (oldpath, win32_newpath);
|
||||
/* AFS? Too bad. Otherwise, just try the default symlink type. */
|
||||
if (win32_newpath.fs_is_afs ())
|
||||
{
|
||||
__seterrno_from_nt_status (status);
|
||||
__seterrno ();
|
||||
goto done;
|
||||
}
|
||||
NtClose (fh);
|
||||
res = 0;
|
||||
goto done;
|
||||
wsym_type = WSYM_sysfile;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
if (mk_winsym)
|
||||
if (wsym_type == WSYM_lnk)
|
||||
{
|
||||
path_conv win32_oldpath;
|
||||
ITEMIDLIST *pidl = NULL;
|
||||
size_t full_len = 0;
|
||||
unsigned short oldpath_len, desc_len, relpath_len, pidl_len = 0;
|
||||
@ -1604,11 +1692,11 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
/* The symlink target is relative to the directory in which
|
||||
the symlink gets created, not relative to the cwd. Therefore
|
||||
we have to mangle the path quite a bit before calling path_conv. */
|
||||
if (isabspath (oldpath))
|
||||
win32_oldpath.check (oldpath,
|
||||
PC_SYM_NOFOLLOW,
|
||||
stat_suffixes);
|
||||
else
|
||||
if (isabspath (oldpath))
|
||||
win32_oldpath.check (oldpath,
|
||||
PC_SYM_NOFOLLOW,
|
||||
stat_suffixes);
|
||||
else
|
||||
{
|
||||
len = strrchr (win32_newpath.normalized_path, '/')
|
||||
- win32_newpath.normalized_path + 1;
|
||||
@ -1677,7 +1765,7 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
full_len += sizeof (unsigned short) + oldpath_len;
|
||||
/* 1 byte more for trailing 0 written by stpcpy. */
|
||||
if (full_len < NT_MAX_PATH * sizeof (WCHAR))
|
||||
buf = (char *) tp.w_get ();
|
||||
buf = tp.t_get ();
|
||||
else
|
||||
buf = (char *) alloca (full_len + 1);
|
||||
|
||||
@ -1721,7 +1809,7 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
else
|
||||
{
|
||||
/* Default technique creating a symlink. */
|
||||
buf = (char *) tp.w_get ();
|
||||
buf = tp.t_get ();
|
||||
cp = stpcpy (buf, SYMLINK_COOKIE);
|
||||
*(PWCHAR) cp = 0xfeff; /* BOM */
|
||||
cp += 2;
|
||||
@ -1729,10 +1817,17 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
cp += sys_mbstowcs ((PWCHAR) cp, NT_MAX_PATH, oldpath) * sizeof (WCHAR);
|
||||
}
|
||||
|
||||
OBJECT_ATTRIBUTES attr;
|
||||
IO_STATUS_BLOCK io;
|
||||
NTSTATUS status;
|
||||
ULONG access;
|
||||
HANDLE fh;
|
||||
|
||||
access = DELETE | FILE_GENERIC_WRITE;
|
||||
if (isdevice && win32_newpath.exists ())
|
||||
{
|
||||
status = NtOpenFile (&fh, FILE_WRITE_ATTRIBUTES,
|
||||
win32_newpath.get_object_attr (attr, sa),
|
||||
win32_newpath.get_object_attr (attr, sec_none_nih),
|
||||
&io, 0, FILE_OPEN_FOR_BACKUP_INTENT);
|
||||
if (!NT_SUCCESS (status))
|
||||
{
|
||||
@ -1758,7 +1853,7 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
so for now we don't request WRITE_DAC on remote drives. */
|
||||
access |= READ_CONTROL | WRITE_DAC;
|
||||
|
||||
status = NtCreateFile (&fh, access, win32_newpath.get_object_attr (attr, sa),
|
||||
status = NtCreateFile (&fh, access, win32_newpath.get_object_attr (attr, sec_none_nih),
|
||||
&io, NULL, FILE_ATTRIBUTE_NORMAL,
|
||||
FILE_SHARE_VALID_FLAGS,
|
||||
isdevice ? FILE_OVERWRITE_IF : FILE_CREATE,
|
||||
@ -1778,8 +1873,9 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
status = NtWriteFile (fh, NULL, NULL, NULL, &io, buf, cp - buf, NULL, NULL);
|
||||
if (NT_SUCCESS (status) && io.Information == (ULONG) (cp - buf))
|
||||
{
|
||||
status = NtSetAttributesFile (fh, mk_winsym ? FILE_ATTRIBUTE_READONLY
|
||||
: FILE_ATTRIBUTE_SYSTEM);
|
||||
status = NtSetAttributesFile (fh, wsym_type == WSYM_lnk
|
||||
? FILE_ATTRIBUTE_READONLY
|
||||
: FILE_ATTRIBUTE_SYSTEM);
|
||||
if (!NT_SUCCESS (status))
|
||||
debug_printf ("Setting attributes failed, status = %y", status);
|
||||
res = 0;
|
||||
@ -1796,8 +1892,8 @@ symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
||||
NtClose (fh);
|
||||
|
||||
done:
|
||||
syscall_printf ("%d = symlink_worker(%s, %s, %d, %d)", res, oldpath,
|
||||
newpath, mk_winsym, isdevice);
|
||||
syscall_printf ("%d = symlink_worker(%s, %s, %d)",
|
||||
res, oldpath, newpath, isdevice);
|
||||
if (has_trailing_dirsep)
|
||||
free ((void *) newpath);
|
||||
return res;
|
||||
|
Reference in New Issue
Block a user