5397 lines
160 KiB
C++
5397 lines
160 KiB
C++
/* path.cc: path support.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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/* This module's job is to
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- convert between POSIX and Win32 style filenames,
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- support the `mount' functionality,
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- support symlinks for files and directories
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Pathnames are handled as follows:
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- A \ or : in a path denotes a pure windows spec.
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- Paths beginning with // (or \\) are not translated (i.e. looked
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up in the mount table) and are assumed to be UNC path names.
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The goal in the above set of rules is to allow both POSIX and Win32
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flavors of pathnames without either interfering. The rules are
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intended to be as close to a superset of both as possible.
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Note that you can have more than one path to a file. The mount
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table is always prefered when translating Win32 paths to POSIX
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paths. Win32 paths in mount table entries may be UNC paths or
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standard Win32 paths starting with <drive-letter>:
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Text vs Binary issues are not considered here in path style
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decisions, although the appropriate flags are retrieved and
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stored in various structures.
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Removing mounted filesystem support would simplify things greatly,
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but having it gives us a mechanism of treating disk that lives on a
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UNIX machine as having UNIX semantics [it allows one to edit a text
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file on that disk and not have cr's magically appear and perhaps
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break apps running on UNIX boxes]. It also useful to be able to
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layout a hierarchy without changing the underlying directories.
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The semantics of mounting file systems is not intended to precisely
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follow normal UNIX systems.
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Each DOS drive is defined to have a current directory. Supporting
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this would complicate things so for now things are defined so that
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c: means c:\.
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*/
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/* This file includes both the XPG and GNU basename functions, with the
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former exported as "basename" for ABI compatibility but the latter
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declared as such for source compatibility with glibc. This tells
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<string.h> not to declare the GNU variant in order to prevent a conflicting
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declaration error with the XPG variant implemented herein. */
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#define basename basename
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#include "winsup.h"
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#include <w32api/winioctl.h>
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#include <w32api/shlobj.h>
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#include <sys/param.h>
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#include <sys/cygwin.h>
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#include <wctype.h>
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#include <assert.h>
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#include "cygerrno.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "shared_info.h"
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#include "tls_pbuf.h"
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#include "environ.h"
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#undef basename
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suffix_info stat_suffixes[] =
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{
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suffix_info ("", 1),
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suffix_info (".exe", 1),
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suffix_info (NULL)
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};
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struct symlink_info
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{
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char contents[SYMLINK_MAX + 1];
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char *ext_here;
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int extn;
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unsigned path_flags;
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unsigned mount_flags;
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unsigned pc_flags; /* Relevant pathconv_arg flags from path_conv caller */
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DWORD fileattr;
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int issymlink;
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bool ext_tacked_on;
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int error;
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bool isdevice;
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_major_t major;
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_minor_t minor;
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__mode_t mode;
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int check (char *path, const suffix_info *suffixes, fs_info &fs,
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path_conv_handle &conv_hdl);
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int set (char *path);
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bool parse_device (const char *);
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int check_sysfile (HANDLE h);
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int check_shortcut (HANDLE h);
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int check_reparse_point (HANDLE h, bool remote);
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int check_nfs_symlink (HANDLE h);
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int posixify (char *srcbuf);
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bool set_error (int);
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};
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muto NO_COPY cwdstuff::cwd_lock;
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static const GUID GUID_shortcut
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= { 0x00021401L, 0, 0, {0xc0, 0, 0, 0, 0, 0, 0, 0x46}};
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enum
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{
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WSH_FLAG_IDLIST = 0x01, /* Contains an ITEMIDLIST. */
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WSH_FLAG_FILE = 0x02, /* Contains a file locator element. */
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WSH_FLAG_DESC = 0x04, /* Contains a description. */
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WSH_FLAG_RELPATH = 0x08, /* Contains a relative path. */
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WSH_FLAG_WD = 0x10, /* Contains a working dir. */
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WSH_FLAG_CMDLINE = 0x20, /* Contains command line args. */
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WSH_FLAG_ICON = 0x40 /* Contains a custom icon. */
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};
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struct win_shortcut_hdr
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{
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DWORD size; /* Header size in bytes. Must contain 0x4c. */
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GUID magic; /* GUID of shortcut files. */
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DWORD flags; /* Content flags. See above. */
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/* The next fields from attr to icon_no are always set to 0 in Cygwin
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and U/Win shortcuts. */
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DWORD attr; /* Target file attributes. */
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FILETIME ctime; /* These filetime items are never touched by the */
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FILETIME mtime; /* system, apparently. Values don't matter. */
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FILETIME atime;
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DWORD filesize; /* Target filesize. */
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DWORD icon_no; /* Icon number. */
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DWORD run; /* Values defined in winuser.h. Use SW_NORMAL. */
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DWORD hotkey; /* Hotkey value. Set to 0. */
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DWORD dummy[2]; /* Future extension probably. Always 0. */
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};
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/* Return non-zero if PATH1 is a prefix of PATH2.
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Both are assumed to be of the same path style and / vs \ usage.
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Neither may be "".
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LEN1 = strlen (PATH1). It's passed because often it's already known.
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Examples:
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/foo/ is a prefix of /foo <-- may seem odd, but desired
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/foo is a prefix of /foo/
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/ is a prefix of /foo/bar
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/ is not a prefix of foo/bar
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foo/ is a prefix foo/bar
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/foo is not a prefix of /foobar
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*/
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int
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path_prefix_p (const char *path1, const char *path2, int len1,
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bool caseinsensitive)
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{
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/* Handle case where PATH1 has trailing '/' and when it doesn't. */
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if (len1 > 0 && isdirsep (path1[len1 - 1]))
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len1--;
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if (len1 == 0)
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return isdirsep (path2[0]) && !isdirsep (path2[1]);
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if (isdirsep (path2[len1]) || path2[len1] == 0 || path1[len1 - 1] == ':')
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return caseinsensitive ? strncasematch (path1, path2, len1)
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: !strncmp (path1, path2, len1);
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return 0;
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}
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/* Return non-zero if paths match in first len chars.
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Check is dependent of the case sensitivity setting. */
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int
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pathnmatch (const char *path1, const char *path2, int len, bool caseinsensitive)
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{
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return caseinsensitive
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? strncasematch (path1, path2, len) : !strncmp (path1, path2, len);
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}
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/* Return non-zero if paths match. Check is dependent of the case
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sensitivity setting. */
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int
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pathmatch (const char *path1, const char *path2, bool caseinsensitive)
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{
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return caseinsensitive
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? strcasematch (path1, path2) : !strcmp (path1, path2);
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}
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/* TODO: This function is used in mkdir and rmdir to generate correct
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error messages in case of paths ending in /. or /.. components.
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Right now, normalize_posix_path will just normalize
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those components away, which changes the semantics. */
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bool
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has_dot_last_component (const char *dir, bool test_dot_dot)
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{
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/* SUSv3: . and .. are not allowed as last components in various system
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calls. Don't test for backslash path separator since that's a Win32
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path following Win32 rules. */
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const char *last_comp = strchr (dir, '\0');
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if (last_comp == dir)
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return false; /* Empty string. Probably shouldn't happen here? */
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/* Detect run of trailing slashes */
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while (last_comp > dir && *--last_comp == '/')
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continue;
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/* Detect just a run of slashes or a path that does not end with a slash. */
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if (*last_comp != '.')
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return false;
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/* We know we have a trailing dot here. Check that it really is a standalone "."
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path component by checking that it is at the beginning of the string or is
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preceded by a "/" */
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if (last_comp == dir || *--last_comp == '/')
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return true;
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/* If we're not checking for '..' we're done. Ditto if we're now pointing to
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a non-dot. */
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if (!test_dot_dot || *last_comp != '.')
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return false; /* either not testing for .. or this was not '..' */
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/* Repeat previous test for standalone or path component. */
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return last_comp == dir || last_comp[-1] == '/';
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}
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/* Normalize a POSIX path.
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All duplicate /'s, except for 2 leading /'s, are deleted.
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The result is 0 for success, or an errno error value. */
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int
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normalize_posix_path (const char *src, char *dst, char *&tail)
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{
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const char *in_src = src;
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char *dst_start = dst;
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bool check_parent = false;
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syscall_printf ("src %s", src);
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if ((isdrive (src) && isdirsep (src[2])) || *src == '\\')
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goto win32_path;
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tail = dst;
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if (!isslash (src[0]))
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{
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if (!cygheap->cwd.get (dst))
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return get_errno ();
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tail = strchr (tail, '\0');
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if (isslash (dst[0]) && isslash (dst[1]))
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++dst_start;
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if (*src == '.')
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{
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if (tail == dst_start + 1 && *dst_start == '/')
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tail--;
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goto sawdot;
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}
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if (tail > dst && !isslash (tail[-1]))
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*tail++ = '/';
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}
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/* Two leading /'s? If so, preserve them. */
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else if (isslash (src[1]) && !isslash (src[2]))
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{
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*tail++ = *src++;
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++dst_start;
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}
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while (*src)
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{
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if (*src == '\\')
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goto win32_path;
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/* Strip runs of /'s. */
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if (!isslash (*src))
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*tail++ = *src++;
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else
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{
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check_parent = true;
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while (*++src)
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{
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if (isslash (*src))
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continue;
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if (*src != '.')
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break;
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sawdot:
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if (src[1] != '.')
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{
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if (!src[1])
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{
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*tail++ = '/';
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goto done;
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}
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if (!isslash (src[1]))
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break;
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}
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else if (src[2] && !isslash (src[2]))
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break;
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else
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{
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/* According to POSIX semantics all elements of path must
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exist. To follow it, we must validate our path before
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removing the trailing component. Check_parent is needed
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for performance optimization, in order not to verify paths
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which are already verified. For example this prevents
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double check in case of foo/bar/../.. */
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if (check_parent)
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{
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if (tail > dst_start) /* Don't check for / or // dir. */
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{
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*tail = 0;
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debug_printf ("checking %s before '..'", dst);
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/* In conjunction with native and NFS symlinks,
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this call can result in a recursion which eats
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up our tmp_pathbuf buffers. This in turn results
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in a api_fatal call. To avoid that, we're
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checking our remaining buffers and return an
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error code instead. Note that this only happens
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if the path contains 15 or more relative native/NFS
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symlinks with a ".." in the target path. */
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tmp_pathbuf tp;
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if (!tp.check_usage (4, 3))
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return ELOOP;
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path_conv head (dst, PC_SYM_FOLLOW | PC_POSIX);
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if (!head.exists ())
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return ENOENT;
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if (!head.isdir ())
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return ENOTDIR;
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/* At this point, dst is a normalized path. If the
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normalized path created by path_conv does not
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match the normalized path we're just testing, then
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the path in dst contains native symlinks. If we
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just plunge along, removing the previous path
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component, we may end up removing a symlink from
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the path and the resulting path will be invalid.
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So we replace dst with what we found in head
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instead. All the work replacing symlinks has been
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done in that path anyway, so why repeat it? */
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tail = stpcpy (dst, head.get_posix ());
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}
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check_parent = false;
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}
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while (tail > dst_start && !isslash (*--tail))
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continue;
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src++;
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}
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}
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*tail++ = '/';
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}
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if ((tail - dst) >= NT_MAX_PATH)
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{
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debug_printf ("ENAMETOOLONG = normalize_posix_path (%s)", src);
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return ENAMETOOLONG;
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}
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}
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done:
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*tail = '\0';
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debug_printf ("%s = normalize_posix_path (%s)", dst, in_src);
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return 0;
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win32_path:
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int err = normalize_win32_path (in_src, dst, tail);
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if (!err)
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for (char *p = dst; (p = strchr (p, '\\')); p++)
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*p = '/';
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return err ?: -1;
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}
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inline void
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path_conv::add_ext_from_sym (symlink_info &sym)
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{
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if (sym.ext_here && *sym.ext_here)
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{
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suffix = path + sym.extn;
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if (sym.ext_tacked_on)
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strcpy ((char *) suffix, sym.ext_here);
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}
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}
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static void __reg2 mkrelpath (char *dst, bool caseinsensitive);
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static void __reg2
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mkrelpath (char *path, bool caseinsensitive)
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{
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tmp_pathbuf tp;
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char *cwd_win32 = tp.c_get ();
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if (!cygheap->cwd.get (cwd_win32, 0))
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return;
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unsigned cwdlen = strlen (cwd_win32);
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if (!path_prefix_p (cwd_win32, path, cwdlen, caseinsensitive))
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return;
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size_t n = strlen (path);
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if (n < cwdlen)
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return;
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char *tail = path;
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if (n == cwdlen)
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tail += cwdlen;
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else
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tail += isdirsep (cwd_win32[cwdlen - 1]) ? cwdlen : cwdlen + 1;
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memmove (path, tail, strlen (tail) + 1);
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if (!*path)
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strcpy (path, ".");
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}
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void
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path_conv::set_posix (const char *path_copy)
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{
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if (path_copy)
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{
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size_t n = strlen (path_copy) + 1;
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char *p = (char *) crealloc_abort ((void *) posix_path, n);
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posix_path = (const char *) memcpy (p, path_copy, n);
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}
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}
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static inline void
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str2uni_cat (UNICODE_STRING &tgt, const char *srcstr)
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{
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int len = sys_mbstowcs (tgt.Buffer + tgt.Length / sizeof (WCHAR),
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(tgt.MaximumLength - tgt.Length) / sizeof (WCHAR),
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srcstr);
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if (len)
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tgt.Length += (len - 1) * sizeof (WCHAR);
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}
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PUNICODE_STRING
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get_nt_native_path (const char *path, UNICODE_STRING& upath, bool dos)
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{
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upath.Length = 0;
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if (path[0] == '/') /* special path w/o NT path representation. */
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str2uni_cat (upath, path);
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else if (path[0] != '\\') /* X:\... or relative path. */
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{
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if (path[1] == ':') /* X:\... */
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{
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RtlAppendUnicodeStringToString (&upath, &ro_u_natp);
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str2uni_cat (upath, path);
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/* The drive letter must be upper case. */
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upath.Buffer[4] = towupper (upath.Buffer[4]);
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transform_chars (&upath, 7);
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}
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else /* relative path */
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{
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str2uni_cat (upath, path);
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transform_chars (&upath, 0);
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}
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}
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else if (path[1] != '\\') /* \Device\... */
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str2uni_cat (upath, path);
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else if ((path[2] != '.' && path[2] != '?')
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|| path[3] != '\\') /* \\server\share\... */
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{
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RtlAppendUnicodeStringToString (&upath, &ro_u_uncp);
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str2uni_cat (upath, path + 2);
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transform_chars (&upath, 8);
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}
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else /* \\.\device or \\?\foo */
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{
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RtlAppendUnicodeStringToString (&upath, &ro_u_natp);
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str2uni_cat (upath, path + 4);
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}
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if (dos)
|
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{
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/* Unfortunately we can't just use transform_chars with the tfx_rev_chars
|
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table since only leading and trailing spaces and dots are affected.
|
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So we step to every backslash and fix surrounding dots and spaces.
|
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That makes these broken filesystems a bit slower, but, hey. */
|
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PWCHAR cp = upath.Buffer + 7;
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PWCHAR cend = upath.Buffer + upath.Length / sizeof (WCHAR);
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while (++cp < cend)
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if (*cp == L'\\')
|
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{
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PWCHAR ccp = cp - 1;
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while (*ccp == L'.' || *ccp == L' ')
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*ccp-- |= 0xf000;
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while (cp[1] == L' ')
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*++cp |= 0xf000;
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}
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while (*--cp == L'.' || *cp == L' ')
|
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*cp |= 0xf000;
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}
|
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return &upath;
|
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}
|
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|
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/* Handle with extrem care! Only used in a certain instance in try_to_bin.
|
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Every other usage needs a careful check. */
|
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void
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path_conv::set_nt_native_path (PUNICODE_STRING new_path)
|
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{
|
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wide_path = (PWCHAR) crealloc_abort (wide_path, new_path->MaximumLength);
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memcpy (wide_path, new_path->Buffer, new_path->Length);
|
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uni_path.Length = new_path->Length;
|
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uni_path.MaximumLength = new_path->MaximumLength;
|
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uni_path.Buffer = wide_path;
|
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}
|
|
|
|
/* If suffix is not NULL, append the suffix string verbatim.
|
|
This is used by fhandler_mqueue::mq_open to append an NTFS stream suffix. */
|
|
PUNICODE_STRING
|
|
path_conv::get_nt_native_path (PUNICODE_STRING suffix)
|
|
{
|
|
PUNICODE_STRING res;
|
|
if (wide_path)
|
|
res = &uni_path;
|
|
else if (!path)
|
|
res = NULL;
|
|
else
|
|
{
|
|
uni_path.Length = 0;
|
|
uni_path.MaximumLength = (strlen (path) + 10) * sizeof (WCHAR);
|
|
if (suffix)
|
|
uni_path.MaximumLength += suffix->Length;
|
|
wide_path = (PWCHAR) cmalloc_abort (HEAP_STR, uni_path.MaximumLength);
|
|
uni_path.Buffer = wide_path;
|
|
::get_nt_native_path (path, uni_path, has_dos_filenames_only ());
|
|
if (suffix)
|
|
RtlAppendUnicodeStringToString (&uni_path, suffix);
|
|
res = &uni_path;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
PWCHAR
|
|
path_conv::get_wide_win32_path (PWCHAR wc)
|
|
{
|
|
get_nt_native_path ();
|
|
if (!wide_path)
|
|
return NULL;
|
|
wcpcpy (wc, wide_path);
|
|
if (wc[1] == L'?')
|
|
wc[1] = L'\\';
|
|
return wc;
|
|
}
|
|
|
|
static DWORD
|
|
getfileattr (const char *path, bool caseinsensitive) /* path has to be always absolute. */
|
|
{
|
|
tmp_pathbuf tp;
|
|
UNICODE_STRING upath;
|
|
OBJECT_ATTRIBUTES attr;
|
|
FILE_BASIC_INFORMATION fbi;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
|
|
tp.u_get (&upath);
|
|
InitializeObjectAttributes (&attr, &upath,
|
|
caseinsensitive ? OBJ_CASE_INSENSITIVE : 0,
|
|
NULL, NULL);
|
|
get_nt_native_path (path, upath, false);
|
|
|
|
status = NtQueryAttributesFile (&attr, &fbi);
|
|
if (NT_SUCCESS (status))
|
|
return fbi.FileAttributes;
|
|
|
|
if (status != STATUS_OBJECT_NAME_NOT_FOUND
|
|
&& status != STATUS_NO_SUCH_FILE) /* File not found on 9x share */
|
|
{
|
|
/* File exists but access denied. Try to get attribute through
|
|
directory query. */
|
|
UNICODE_STRING dirname, basename;
|
|
HANDLE dir;
|
|
FILE_BOTH_DIR_INFORMATION fdi;
|
|
|
|
RtlSplitUnicodePath (&upath, &dirname, &basename);
|
|
InitializeObjectAttributes (&attr, &dirname,
|
|
caseinsensitive ? OBJ_CASE_INSENSITIVE : 0,
|
|
NULL, NULL);
|
|
status = NtOpenFile (&dir, SYNCHRONIZE | FILE_LIST_DIRECTORY,
|
|
&attr, &io, FILE_SHARE_VALID_FLAGS,
|
|
FILE_SYNCHRONOUS_IO_NONALERT
|
|
| FILE_OPEN_FOR_BACKUP_INTENT
|
|
| FILE_DIRECTORY_FILE);
|
|
if (NT_SUCCESS (status))
|
|
{
|
|
status = NtQueryDirectoryFile (dir, NULL, NULL, 0, &io,
|
|
&fdi, sizeof fdi,
|
|
FileBothDirectoryInformation,
|
|
TRUE, &basename, TRUE);
|
|
NtClose (dir);
|
|
if (NT_SUCCESS (status) || status == STATUS_BUFFER_OVERFLOW)
|
|
return fdi.FileAttributes;
|
|
}
|
|
}
|
|
SetLastError (RtlNtStatusToDosError (status));
|
|
return INVALID_FILE_ATTRIBUTES;
|
|
}
|
|
|
|
/* Convert an arbitrary path SRC to a pure Win32 path, suitable for
|
|
passing to Win32 API routines.
|
|
|
|
If an error occurs, `error' is set to the errno value.
|
|
Otherwise it is set to 0.
|
|
|
|
follow_mode values:
|
|
SYMLINK_FOLLOW - convert to PATH symlink points to
|
|
SYMLINK_NOFOLLOW - convert to PATH of symlink itself
|
|
SYMLINK_IGNORE - do not check PATH for symlinks
|
|
SYMLINK_CONTENTS - just return symlink contents
|
|
*/
|
|
|
|
/* TODO: This implementation is only preliminary. For internal
|
|
purposes it's necessary to have a path_conv::check function which
|
|
takes a UNICODE_STRING src path, otherwise we waste a lot of time
|
|
for converting back and forth. The below implementation does
|
|
realy nothing but converting to char *, until path_conv handles
|
|
wide-char paths directly. */
|
|
void
|
|
path_conv::check (const UNICODE_STRING *src, unsigned opt,
|
|
const suffix_info *suffixes)
|
|
{
|
|
tmp_pathbuf tp;
|
|
char *path = tp.c_get ();
|
|
|
|
user_shared->warned_msdos = true;
|
|
sys_wcstombs (path, NT_MAX_PATH, src->Buffer, src->Length / sizeof (WCHAR));
|
|
path_conv::check (path, opt, suffixes);
|
|
}
|
|
|
|
void
|
|
path_conv::check (const char *src, unsigned opt,
|
|
const suffix_info *suffixes)
|
|
{
|
|
/* The tmp_buf array is used when expanding symlinks. It is NT_MAX_PATH * 2
|
|
in length so that we can hold the expanded symlink plus a trailer. */
|
|
tmp_pathbuf tp;
|
|
char *path_copy = tp.c_get ();
|
|
char *pathbuf = tp.c_get ();
|
|
char *tmp_buf = tp.t_get ();
|
|
char *THIS_path = tp.c_get ();
|
|
symlink_info sym;
|
|
bool need_directory = 0;
|
|
bool add_ext = false;
|
|
bool is_relpath;
|
|
char *tail, *path_end;
|
|
|
|
#if 0
|
|
static path_conv last_path_conv;
|
|
static char last_src[CYG_MAX_PATH];
|
|
|
|
if (*last_src && strcmp (last_src, src) == 0)
|
|
{
|
|
*this = last_path_conv;
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
__try
|
|
{
|
|
int loop = 0;
|
|
mount_flags = 0;
|
|
path_flags = 0;
|
|
suffix = NULL;
|
|
fileattr = INVALID_FILE_ATTRIBUTES;
|
|
caseinsensitive = OBJ_CASE_INSENSITIVE;
|
|
if (wide_path)
|
|
cfree (wide_path);
|
|
wide_path = NULL;
|
|
if (path)
|
|
{
|
|
cfree (modifiable_path ());
|
|
path = NULL;
|
|
}
|
|
close_conv_handle ();
|
|
fs.clear ();
|
|
if (posix_path)
|
|
{
|
|
cfree ((void *) posix_path);
|
|
posix_path = NULL;
|
|
}
|
|
int component = 0; // Number of translated components
|
|
|
|
if (!(opt & PC_NULLEMPTY))
|
|
error = 0;
|
|
else if (!*src)
|
|
{
|
|
error = ENOENT;
|
|
return;
|
|
}
|
|
|
|
bool is_msdos = false;
|
|
/* This loop handles symlink expansion. */
|
|
for (;;)
|
|
{
|
|
is_relpath = !isabspath (src);
|
|
error = normalize_posix_path (src, path_copy, tail);
|
|
if (error > 0)
|
|
return;
|
|
if (error < 0)
|
|
{
|
|
if (component == 0)
|
|
is_msdos = true;
|
|
error = 0;
|
|
}
|
|
|
|
/* Detect if the user was looking for a directory. We have to strip
|
|
the trailing slash initially while trying to add extensions but
|
|
take it into account during processing */
|
|
if (tail > path_copy + 2 && isslash (tail[-1]))
|
|
{
|
|
need_directory = 1;
|
|
*--tail = '\0';
|
|
}
|
|
path_end = tail;
|
|
|
|
/* Scan path_copy from right to left looking either for a symlink
|
|
or an actual existing file. If an existing file is found, just
|
|
return. If a symlink is found, exit the for loop.
|
|
Also: be careful to preserve the errno returned from
|
|
symlink.check as the caller may need it. */
|
|
/* FIXME: Do we have to worry about multiple \'s here? */
|
|
component = 0; // Number of translated components
|
|
sym.contents[0] = '\0';
|
|
|
|
int symlen = 0;
|
|
|
|
/* Make sure to check certain flags on last component only. */
|
|
for (unsigned pc_flags = opt & (PC_NO_ACCESS_CHECK | PC_KEEP_HANDLE
|
|
| PC_SYM_FOLLOW | PC_SYM_NOFOLLOW_REP);
|
|
;
|
|
pc_flags = opt & (PC_SYM_FOLLOW | PC_SYM_NOFOLLOW_REP))
|
|
{
|
|
const suffix_info *suff;
|
|
char *full_path;
|
|
|
|
/* Don't allow symlink.check to set anything in the path_conv
|
|
class if we're working on an inner component of the path */
|
|
if (component)
|
|
{
|
|
suff = NULL;
|
|
full_path = pathbuf;
|
|
}
|
|
else
|
|
{
|
|
suff = suffixes;
|
|
full_path = THIS_path;
|
|
}
|
|
|
|
retry_fs_via_processfd:
|
|
|
|
/* Convert to native path spec sans symbolic link info. */
|
|
error = mount_table->conv_to_win32_path (path_copy, full_path,
|
|
dev, &sym.mount_flags);
|
|
|
|
if (error)
|
|
return;
|
|
|
|
sym.pc_flags = pc_flags;
|
|
|
|
if (!dev.exists ())
|
|
{
|
|
error = ENXIO;
|
|
return;
|
|
}
|
|
|
|
if (iscygdrive_dev (dev))
|
|
{
|
|
if (!component)
|
|
fileattr = FILE_ATTRIBUTE_DIRECTORY
|
|
| FILE_ATTRIBUTE_READONLY;
|
|
else
|
|
{
|
|
fileattr = getfileattr (THIS_path,
|
|
sym.mount_flags & MOUNT_NOPOSIX);
|
|
dev = FH_FS;
|
|
}
|
|
goto out;
|
|
}
|
|
else if (isdev_dev (dev))
|
|
{
|
|
/* Make sure that the path handling goes on as with FH_FS. */
|
|
}
|
|
else if (isvirtual_dev (dev))
|
|
{
|
|
/* FIXME: Calling build_fhandler here is not the right way to
|
|
handle this. */
|
|
fhandler_virtual *fh = (fhandler_virtual *)
|
|
build_fh_dev (dev, path_copy);
|
|
virtual_ftype_t file_type;
|
|
if (!fh)
|
|
file_type = virt_none;
|
|
else
|
|
{
|
|
file_type = fh->exists ();
|
|
if (file_type == virt_symlink
|
|
|| file_type == virt_fdsymlink)
|
|
{
|
|
fh->fill_filebuf ();
|
|
symlen = sym.set (fh->get_filebuf ());
|
|
}
|
|
else if (file_type == virt_fsdir && dev == FH_PROCESSFD)
|
|
{
|
|
/* FIXME: This is YA bad hack to workaround that
|
|
we're checking for isvirtual_dev at this point.
|
|
This should only happen if the file is actually
|
|
a virtual file, and NOT already if the preceeding
|
|
path components constitute a virtual file.
|
|
|
|
Anyway, what we do here is this: If the descriptor
|
|
symlink points to a dir, and if there are trailing
|
|
path components, it's actually pointing somewhere
|
|
else. The format_process_fd function returns the
|
|
full path, resolved symlink plus trailing path
|
|
components, in its filebuf. This is a POSIX path
|
|
we know nothing about, so we have to convert it to
|
|
native again, calling conv_to_win32_path. Since
|
|
basically nothing happened yet, just copy it over
|
|
into full_path and jump back to the
|
|
conv_to_win32_path call. What a mess. */
|
|
stpcpy (path_copy, fh->get_filebuf ());
|
|
delete fh;
|
|
goto retry_fs_via_processfd;
|
|
}
|
|
else if (file_type == virt_none && dev == FH_PROCESSFD)
|
|
{
|
|
error = get_errno ();
|
|
if (error)
|
|
{
|
|
delete fh;
|
|
return;
|
|
}
|
|
}
|
|
delete fh;
|
|
}
|
|
switch (file_type)
|
|
{
|
|
case virt_directory:
|
|
case virt_rootdir:
|
|
if (component == 0)
|
|
fileattr = FILE_ATTRIBUTE_DIRECTORY;
|
|
break;
|
|
case virt_file:
|
|
if (component == 0)
|
|
fileattr = 0;
|
|
break;
|
|
case virt_fdsymlink:
|
|
/* Allow open/linkat to do the right thing. */
|
|
if (opt & PC_SYM_NOFOLLOW_PROCFD)
|
|
{
|
|
opt &= ~PC_SYM_FOLLOW;
|
|
sym.path_flags |= PATH_RESOLVE_PROCFD;
|
|
}
|
|
fallthrough;
|
|
case virt_symlink:
|
|
goto is_virtual_symlink;
|
|
case virt_pipe:
|
|
if (component == 0)
|
|
{
|
|
fileattr = 0;
|
|
dev.parse (FH_PIPE);
|
|
}
|
|
break;
|
|
case virt_socket:
|
|
if (component == 0)
|
|
{
|
|
fileattr = 0;
|
|
dev.parse (FH_SOCKET);
|
|
}
|
|
break;
|
|
case virt_fsdir:
|
|
case virt_fsfile:
|
|
/* Access to real file or directory via block device
|
|
entry in /proc/sys. Convert to real file and go with
|
|
the flow. */
|
|
dev.parse (FH_FS);
|
|
goto is_fs_via_procsys;
|
|
case virt_blk:
|
|
/* Block special device. Convert to a /dev/sd* like
|
|
block device unless the trailing slash has been
|
|
requested. In this case, the target is the root
|
|
directory of the filesystem on this block device.
|
|
So we convert this to a real file and attach the
|
|
backslash. */
|
|
if (component == 0)
|
|
{
|
|
fileattr = FILE_ATTRIBUTE_DEVICE;
|
|
if (!need_directory)
|
|
/* Use a /dev/sd* device number > /dev/sddx.
|
|
FIXME: Define a new major DEV_ice number. */
|
|
dev.parse (DEV_SD_HIGHPART_END, 9999);
|
|
else
|
|
{
|
|
dev.parse (FH_FS);
|
|
strcat (full_path, "\\");
|
|
fileattr |= FILE_ATTRIBUTE_DIRECTORY;
|
|
}
|
|
goto out;
|
|
}
|
|
break;
|
|
case virt_chr:
|
|
if (component == 0)
|
|
fileattr = FILE_ATTRIBUTE_DEVICE;
|
|
break;
|
|
default:
|
|
if (component == 0)
|
|
fileattr = INVALID_FILE_ATTRIBUTES;
|
|
goto virtual_component_retry;
|
|
}
|
|
if (component == 0 || dev != FH_NETDRIVE)
|
|
mount_flags |= MOUNT_RO;
|
|
goto out;
|
|
}
|
|
/* devn should not be a device. If it is, then stop parsing. */
|
|
else if (dev != FH_FS)
|
|
{
|
|
fileattr = 0;
|
|
mount_flags = sym.mount_flags;
|
|
path_flags = sym.path_flags;
|
|
if (component)
|
|
{
|
|
error = ENOTDIR;
|
|
return;
|
|
}
|
|
goto out; /* Found a device. Stop parsing. */
|
|
}
|
|
|
|
/* If path is only a drivename, Windows interprets it as the
|
|
current working directory on this drive instead of the root
|
|
dir which is what we want. So we need the trailing backslash
|
|
in this case. */
|
|
if (full_path[0] && full_path[1] == ':' && full_path[2] == '\0')
|
|
{
|
|
full_path[2] = '\\';
|
|
full_path[3] = '\0';
|
|
}
|
|
|
|
/* If the incoming path was given in DOS notation, always treat
|
|
it as caseinsensitive,noacl path. This must be set before
|
|
calling sym.check, otherwise the path is potentially treated
|
|
casesensitive. */
|
|
if (is_msdos)
|
|
sym.mount_flags |= MOUNT_NOPOSIX | MOUNT_NOACL;
|
|
|
|
is_fs_via_procsys:
|
|
|
|
symlen = sym.check (full_path, suff, fs, conv_handle);
|
|
|
|
is_virtual_symlink:
|
|
|
|
if (sym.isdevice)
|
|
{
|
|
if (component)
|
|
{
|
|
error = ENOTDIR;
|
|
return;
|
|
}
|
|
dev.parse (sym.major, sym.minor);
|
|
dev.setfs (1);
|
|
dev.mode (sym.mode);
|
|
fileattr = sym.fileattr;
|
|
goto out;
|
|
}
|
|
|
|
if (sym.path_flags & PATH_SOCKET)
|
|
{
|
|
if (component)
|
|
{
|
|
error = ENOTDIR;
|
|
return;
|
|
}
|
|
fileattr = sym.fileattr;
|
|
#ifdef __WITH_AF_UNIX
|
|
dev.parse ((sym.path_flags & PATH_REP) ? FH_UNIX : FH_LOCAL);
|
|
#else
|
|
dev.parse (FH_LOCAL);
|
|
#endif /* __WITH_AF_UNIX */
|
|
dev.setfs (1);
|
|
mount_flags = sym.mount_flags;
|
|
path_flags = sym.path_flags;
|
|
goto out;
|
|
}
|
|
|
|
if (!component)
|
|
{
|
|
/* Make sure that /dev always exists. */
|
|
fileattr = isdev_dev (dev) ? FILE_ATTRIBUTE_DIRECTORY
|
|
: sym.fileattr;
|
|
mount_flags = sym.mount_flags;
|
|
path_flags = sym.path_flags;
|
|
}
|
|
else if (isdev_dev (dev))
|
|
{
|
|
/* If we're looking for a non-existing file below /dev,
|
|
make sure that the device type is converted to FH_FS, so
|
|
that subsequent code handles the file correctly. Unless
|
|
/dev itself doesn't exist on disk. In that case /dev
|
|
is handled as virtual filesystem, and virtual filesystems
|
|
are read-only. The PC_KEEP_HANDLE check allows to check
|
|
for a call from an informational system call. In that
|
|
case we just stick to ENOENT, and the device type doesn't
|
|
matter anyway. */
|
|
if (sym.error == ENOENT && !(opt & PC_KEEP_HANDLE))
|
|
sym.error = EROFS;
|
|
else
|
|
dev = FH_FS;
|
|
}
|
|
|
|
/* If symlink.check found an existing non-symlink file, then
|
|
it sets the appropriate flag. It also sets any suffix found
|
|
into `ext_here'. */
|
|
if (!sym.issymlink && sym.fileattr != INVALID_FILE_ATTRIBUTES)
|
|
{
|
|
error = sym.error;
|
|
if (component == 0)
|
|
add_ext = true;
|
|
else if (!(sym.fileattr & FILE_ATTRIBUTE_DIRECTORY))
|
|
{
|
|
error = ENOTDIR;
|
|
goto out;
|
|
}
|
|
goto out; // file found
|
|
}
|
|
/* Found a symlink if symlen > 0 or short-circuited a native
|
|
symlink or junction point if symlen < 0.
|
|
If symlen > 0 and component == 0, then the src path itself
|
|
was a symlink. If !follow_mode then we're done. Otherwise
|
|
we have to insert the path found into the full path that we
|
|
are building and perform all of these operations again on the
|
|
newly derived path. */
|
|
else if (symlen)
|
|
{
|
|
/* if symlen is negativ, the actual native symlink or
|
|
junction point is an inner path component. Just fix up
|
|
symlen to be positive and don't try any PC_SYM_FOLLOW
|
|
handling. */
|
|
if (symlen < 0)
|
|
symlen = -symlen;
|
|
else if (component == 0
|
|
&& (!(opt & PC_SYM_FOLLOW)
|
|
|| (is_winapi_reparse_point ()
|
|
&& (opt & PC_SYM_NOFOLLOW_REP))))
|
|
{
|
|
/* Usually a trailing slash requires to follow a symlink,
|
|
even with PC_SYM_NOFOLLOW. The reason is that "foo/"
|
|
is equivalent to "foo/." so the symlink is in fact not
|
|
the last path component.
|
|
|
|
PC_SYM_NOFOLLOW_DIR is used to indicate that the
|
|
last path component is the target symlink and the
|
|
trailing slash is supposed to be ignored. */
|
|
if (!need_directory || (opt & PC_SYM_NOFOLLOW_DIR))
|
|
{
|
|
/* last component of path is a symlink. */
|
|
set_symlink (symlen);
|
|
/* make sure not to set errno to ENOTDIR. */
|
|
need_directory = 0;
|
|
if (opt & PC_SYM_CONTENTS)
|
|
{
|
|
strcpy (THIS_path, sym.contents);
|
|
goto out;
|
|
}
|
|
add_ext = true;
|
|
goto out;
|
|
}
|
|
}
|
|
/* Following a symlink we can't trust the collected
|
|
filesystem information any longer. */
|
|
fs.clear ();
|
|
/* Close handle, if we have any. Otherwise we're collecting
|
|
handles while following symlinks. */
|
|
conv_handle.close ();
|
|
break;
|
|
}
|
|
else if (sym.error && sym.error != ENOENT)
|
|
{
|
|
error = sym.error;
|
|
goto out;
|
|
}
|
|
/* No existing file found. */
|
|
|
|
virtual_component_retry:
|
|
/* Find the new "tail" of the path, e.g. in '/for/bar/baz',
|
|
/baz is the tail. */
|
|
if (tail != path_end)
|
|
*tail = '/';
|
|
while (--tail > path_copy + 1 && *tail != '/') {}
|
|
/* Exit loop if there is no tail or we are at the
|
|
beginning of a UNC path */
|
|
if (tail <= path_copy + 1)
|
|
goto out; // all done
|
|
|
|
/* Haven't found an existing pathname component yet.
|
|
Pinch off the tail and try again. */
|
|
*tail = '\0';
|
|
component++;
|
|
}
|
|
|
|
/* Arrive here if above loop detected a symlink. */
|
|
if (++loop > SYMLOOP_MAX)
|
|
{
|
|
error = ELOOP; // Eep.
|
|
return;
|
|
}
|
|
|
|
/* Place the link content, possibly with head and/or tail,
|
|
in tmp_buf */
|
|
|
|
char *headptr;
|
|
if (isabspath (sym.contents))
|
|
headptr = tmp_buf; /* absolute path */
|
|
else
|
|
{
|
|
/* Copy the first part of the path (with ending /) and point to
|
|
the end. */
|
|
char *prevtail = tail;
|
|
while (--prevtail > path_copy && *prevtail != '/') {}
|
|
int headlen = prevtail - path_copy + 1;;
|
|
memcpy (tmp_buf, path_copy, headlen);
|
|
headptr = &tmp_buf[headlen];
|
|
}
|
|
|
|
/* Make sure there is enough space */
|
|
if (headptr + symlen >= tmp_buf + (2 * NT_MAX_PATH))
|
|
{
|
|
too_long:
|
|
error = ENAMETOOLONG;
|
|
set_path ("::ENAMETOOLONG::");
|
|
return;
|
|
}
|
|
|
|
/* Copy the symlink contents to the end of tmp_buf.
|
|
Convert slashes. */
|
|
for (char *p = sym.contents; *p; p++)
|
|
*headptr++ = *p == '\\' ? '/' : *p;
|
|
*headptr = '\0';
|
|
|
|
/* Copy any tail component (with the 0) */
|
|
if (tail++ < path_end)
|
|
{
|
|
/* Add a slash if needed. There is space. */
|
|
if (*(headptr - 1) != '/')
|
|
*headptr++ = '/';
|
|
int taillen = path_end - tail + 1;
|
|
if (headptr + taillen > tmp_buf + (2 * NT_MAX_PATH))
|
|
goto too_long;
|
|
memcpy (headptr, tail, taillen);
|
|
}
|
|
|
|
/* Evaluate everything all over again. */
|
|
src = tmp_buf;
|
|
}
|
|
|
|
if (!(opt & PC_SYM_CONTENTS))
|
|
add_ext = true;
|
|
|
|
out:
|
|
set_path (THIS_path);
|
|
if (add_ext)
|
|
add_ext_from_sym (sym);
|
|
if (dev == FH_NETDRIVE && component)
|
|
{
|
|
/* This case indicates a non-existant resp. a non-retrievable
|
|
share. This happens for instance if the share is a printer.
|
|
In this case the path must not be treated like a FH_NETDRIVE,
|
|
but like a FH_FS instead, so the usual open call for files
|
|
is used on it. */
|
|
dev.parse (FH_FS);
|
|
}
|
|
else if (isproc_dev (dev) && fileattr == INVALID_FILE_ATTRIBUTES)
|
|
{
|
|
/* FIXME: Usually we don't set error to ENOENT if a file doesn't
|
|
exist. This is typically indicated by the fileattr content.
|
|
So, why here? The downside is that cygwin_conv_path just gets
|
|
an error for these paths so it reports the error back to the
|
|
application. Unlike in all other cases of non-existant files,
|
|
for which check doesn't set error, so cygwin_conv_path just
|
|
returns the path, as intended. */
|
|
error = ENOENT;
|
|
return;
|
|
}
|
|
else if (!need_directory || error)
|
|
/* nothing to do */;
|
|
else if (fileattr == INVALID_FILE_ATTRIBUTES)
|
|
/* Reattach trailing dirsep in native path. */
|
|
strcat (modifiable_path (), "\\");
|
|
else if (fileattr & FILE_ATTRIBUTE_DIRECTORY)
|
|
path_flags &= ~PATH_SYMLINK;
|
|
else
|
|
{
|
|
debug_printf ("%s is a non-directory", path);
|
|
error = ENOTDIR;
|
|
return;
|
|
}
|
|
|
|
/* Restore last path component */
|
|
if (tail < path_end && tail > path_copy + 1)
|
|
*tail = '/';
|
|
|
|
if (dev.isfs ())
|
|
{
|
|
/* If FS hasn't been checked already in symlink_info::check,
|
|
do so now. */
|
|
if (fs.inited ()|| fs.update (get_nt_native_path (), NULL))
|
|
{
|
|
/* Incoming DOS paths are treated like DOS paths in native
|
|
Windows applications. No ACLs, just default settings. */
|
|
if (is_msdos)
|
|
fs.has_acls (false);
|
|
debug_printf ("this->path(%s), has_acls(%d)",
|
|
path, fs.has_acls ());
|
|
/* CV: We could use this->has_acls() but I want to make sure that
|
|
we don't forget that the MOUNT_NOACL flag must be taken into
|
|
account here. */
|
|
if (!(mount_flags & MOUNT_NOACL) && fs.has_acls ())
|
|
set_exec (0); /* We really don't know if this is executable or
|
|
not here but set it to not executable since
|
|
it will be figured out later by anything
|
|
which cares about this. */
|
|
}
|
|
/* If the FS has been found to have unreliable inodes, note
|
|
that in mount_flags. */
|
|
if (!fs.hasgood_inode ())
|
|
mount_flags |= MOUNT_IHASH;
|
|
/* If the OS is caseinsensitive or the FS is caseinsensitive,
|
|
don't handle path casesensitive. */
|
|
if (cygwin_shared->obcaseinsensitive || fs.caseinsensitive ())
|
|
mount_flags |= MOUNT_NOPOSIX;
|
|
caseinsensitive = (mount_flags & MOUNT_NOPOSIX)
|
|
? OBJ_CASE_INSENSITIVE : 0;
|
|
if (exec_state () != dont_know_if_executable)
|
|
/* ok */;
|
|
else if (isdir ())
|
|
set_exec (1);
|
|
else if (issymlink () || issocket ())
|
|
set_exec (0);
|
|
|
|
/* FIXME: bad hack alert!!! We need a better solution */
|
|
if (!strncmp (path_copy, MQ_PATH, MQ_LEN) && path_copy[MQ_LEN])
|
|
dev.parse (FH_MQUEUE);
|
|
}
|
|
|
|
if (opt & PC_NOFULL)
|
|
{
|
|
if (is_relpath)
|
|
{
|
|
mkrelpath (this->modifiable_path (), !!caseinsensitive);
|
|
/* Invalidate wide_path so that wide relpath can be created
|
|
in later calls to get_nt_native_path or get_wide_win32_path. */
|
|
if (wide_path)
|
|
cfree (wide_path);
|
|
wide_path = NULL;
|
|
}
|
|
if (need_directory)
|
|
{
|
|
size_t n = strlen (this->path);
|
|
/* Do not add trailing \ to UNC device names like \\.\a: */
|
|
if (this->path[n - 1] != '\\' &&
|
|
(strncmp (this->path, "\\\\.\\", 4) != 0))
|
|
{
|
|
this->modifiable_path ()[n] = '\\';
|
|
this->modifiable_path ()[n + 1] = '\0';
|
|
}
|
|
}
|
|
}
|
|
|
|
if (opt & PC_OPEN)
|
|
path_flags |= PATH_OPEN;
|
|
|
|
if (opt & PC_CTTY)
|
|
path_flags |= PATH_CTTY;
|
|
|
|
if (opt & PC_POSIX)
|
|
set_posix (path_copy);
|
|
|
|
#if 0
|
|
if (!error)
|
|
{
|
|
last_path_conv = *this;
|
|
strcpy (last_src, src);
|
|
}
|
|
#endif
|
|
}
|
|
__except (NO_ERROR)
|
|
{
|
|
error = EFAULT;
|
|
}
|
|
__endtry
|
|
}
|
|
|
|
struct pc_flat
|
|
{
|
|
path_conv pc;
|
|
HANDLE hdl;
|
|
size_t name_len;
|
|
size_t posix_len;
|
|
char data[0];
|
|
};
|
|
|
|
void *
|
|
path_conv::serialize (HANDLE h, unsigned int &n) const
|
|
{
|
|
pc_flat *pcf;
|
|
size_t nlen = 0, plen = 0;
|
|
char *p;
|
|
|
|
if (path)
|
|
nlen = strlen (path) + 1;
|
|
if (posix_path)
|
|
plen = strlen (posix_path) + 1;
|
|
n = sizeof (pc_flat) + nlen + plen;
|
|
pcf = (pc_flat *) cmalloc (HEAP_COMMUNE, n);
|
|
if (!pcf)
|
|
{
|
|
n = 0;
|
|
return NULL;
|
|
}
|
|
memcpy ((void *) &pcf->pc, this, sizeof *this);
|
|
pcf->hdl = h;
|
|
pcf->name_len = nlen;
|
|
pcf->posix_len = plen;
|
|
p = pcf->data;
|
|
if (nlen)
|
|
p = stpcpy (p, path) + 1;
|
|
if (plen)
|
|
stpcpy (p, posix_path);
|
|
return pcf;
|
|
}
|
|
|
|
HANDLE
|
|
path_conv::deserialize (void *bufp)
|
|
{
|
|
pc_flat *pcf = (pc_flat *) bufp;
|
|
char *p;
|
|
HANDLE ret;
|
|
|
|
memcpy ((void *) this, &pcf->pc, sizeof *this);
|
|
wide_path = uni_path.Buffer = NULL;
|
|
uni_path.MaximumLength = uni_path.Length = 0;
|
|
path = posix_path = NULL;
|
|
p = pcf->data;
|
|
if (pcf->name_len)
|
|
{
|
|
set_path (p);
|
|
p += pcf->name_len;
|
|
}
|
|
if (pcf->posix_len)
|
|
set_posix (p);
|
|
dev.parse (pcf->pc.dev);
|
|
ret = pcf->hdl;
|
|
cfree (bufp);
|
|
return ret;
|
|
}
|
|
|
|
path_conv::~path_conv ()
|
|
{
|
|
if (posix_path)
|
|
{
|
|
cfree ((void *) posix_path);
|
|
posix_path = NULL;
|
|
}
|
|
if (path)
|
|
{
|
|
cfree (modifiable_path ());
|
|
path = NULL;
|
|
}
|
|
if (wide_path)
|
|
{
|
|
cfree (wide_path);
|
|
wide_path = NULL;
|
|
}
|
|
close_conv_handle ();
|
|
}
|
|
|
|
bool
|
|
path_conv::is_binary ()
|
|
{
|
|
tmp_pathbuf tp;
|
|
PWCHAR bintest = tp.w_get ();
|
|
DWORD bin;
|
|
|
|
return GetBinaryTypeW (get_wide_win32_path (bintest), &bin)
|
|
&& (bin == SCS_32BIT_BINARY || bin == SCS_64BIT_BINARY);
|
|
}
|
|
|
|
/* Helper function to fill the fai datastructure for a file. */
|
|
NTSTATUS
|
|
file_get_fai (HANDLE h, PFILE_ALL_INFORMATION pfai)
|
|
{
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
|
|
/* Some FSes (Netapps) don't implement FileNetworkOpenInformation. */
|
|
status = NtQueryInformationFile (h, &io, pfai, sizeof *pfai,
|
|
FileAllInformation);
|
|
if (likely (status == STATUS_BUFFER_OVERFLOW))
|
|
status = STATUS_SUCCESS;
|
|
/* Filesystems with broken FileAllInformation exist, too. See the thread
|
|
starting with https://cygwin.com/ml/cygwin/2016-07/msg00350.html. */
|
|
else if (!NT_SUCCESS (status) && status != STATUS_ACCESS_DENIED)
|
|
{
|
|
memset (pfai, 0, sizeof *pfai);
|
|
status = NtQueryInformationFile (h, &io, &pfai->BasicInformation,
|
|
sizeof pfai->BasicInformation,
|
|
FileBasicInformation);
|
|
if (NT_SUCCESS (status))
|
|
{
|
|
/* The return value of FileInternalInformation is largely ignored.
|
|
We only make absolutely sure the inode number is set to 0 in
|
|
case it fails. */
|
|
status = NtQueryInformationFile (h, &io, &pfai->InternalInformation,
|
|
sizeof pfai->InternalInformation,
|
|
FileInternalInformation);
|
|
if (!NT_SUCCESS (status))
|
|
pfai->InternalInformation.IndexNumber.QuadPart = 0LL;
|
|
status = NtQueryInformationFile (h, &io, &pfai->StandardInformation,
|
|
sizeof pfai->StandardInformation,
|
|
FileStandardInformation);
|
|
}
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/* Normalize a Win32 path.
|
|
/'s are converted to \'s in the process.
|
|
All duplicate \'s, except for 2 leading \'s, are deleted.
|
|
|
|
The result is 0 for success, or an errno error value.
|
|
FIXME: A lot of this should be mergeable with the POSIX critter. */
|
|
int
|
|
normalize_win32_path (const char *src, char *dst, char *&tail)
|
|
{
|
|
const char *src_start = src;
|
|
const char *dst_start = dst;
|
|
bool beg_src_slash = isdirsep (src[0]);
|
|
|
|
tail = dst;
|
|
/* Skip Win32 long path name prefix and NT object directory prefix. */
|
|
if (beg_src_slash && (src[1] == '?' || isdirsep (src[1]))
|
|
&& src[2] == '?' && isdirsep (src[3]))
|
|
{
|
|
src += 4;
|
|
if (isdrive (src) && (isdirsep (src[2]) || !src[2]))
|
|
beg_src_slash = false;
|
|
else if (!strncmp (src, "UNC", 3) && isdirsep (src[3]))
|
|
/* native UNC path */
|
|
src += 2; /* Fortunately the first char is not copied... */
|
|
else
|
|
return EINVAL;
|
|
}
|
|
if (beg_src_slash && isdirsep (src[1]))
|
|
{
|
|
if (isdirsep (src[2]))
|
|
{
|
|
/* More than two slashes are just folded into one. */
|
|
src += 2;
|
|
while (isdirsep (src[1]))
|
|
++src;
|
|
}
|
|
else
|
|
{
|
|
/* Two slashes start a network or device path. */
|
|
*tail++ = '\\';
|
|
src++;
|
|
if (src[1] == '.' && isdirsep (src[2]))
|
|
{
|
|
*tail++ = '\\';
|
|
*tail++ = '.';
|
|
src += 2;
|
|
}
|
|
}
|
|
dst = tail;
|
|
/* If backslash is missing in src, add one. */
|
|
if (!isdirsep (src[0]))
|
|
*tail++ = '\\';
|
|
}
|
|
if (tail == dst_start)
|
|
{
|
|
if (isdrive (src))
|
|
{
|
|
/* Always convert drive letter to uppercase for case sensitivity. */
|
|
*tail++ = cyg_toupper (*src++);
|
|
*tail++ = *src++;
|
|
dst = tail;
|
|
/* If backslash is missing in src, add one. */
|
|
if (!isdirsep (src[0]))
|
|
*tail++ = '\\';
|
|
}
|
|
else if (*src != '/')
|
|
{
|
|
/* Make sure dst points to the rightmost backslash which must not
|
|
be backtracked over during ".." evaluation. This is either
|
|
the backslash after the network path prefix (i.e. "\\") or
|
|
the backslash after a drive letter (i.e. C:\"). */
|
|
if (beg_src_slash)
|
|
{
|
|
tail += cygheap->cwd.get_drive (dst);
|
|
/* network path, drive == '\\\\'? Decrement tail to avoid
|
|
triple backslash in output. */
|
|
if (dst[0] == '\\')
|
|
--tail;
|
|
dst = tail;
|
|
}
|
|
else if (cygheap->cwd.get (dst, 0))
|
|
{
|
|
tail = strchr (tail, '\0');
|
|
if (tail[-1] != '\\')
|
|
*tail++ = '\\';
|
|
++dst;
|
|
if (dst[1] == '\\')
|
|
++dst;
|
|
}
|
|
else
|
|
return get_errno ();
|
|
}
|
|
}
|
|
|
|
/* At this point dst points to the first backslash, even if it only gets
|
|
written in the first iteration of the following loop. Backing up to
|
|
handle ".." components can not underrun that border (thus avoiding
|
|
subsequent buffer underruns with fatal results). */
|
|
while (*src)
|
|
{
|
|
/* Strip duplicate /'s. */
|
|
if (isdirsep (src[0]) && isdirsep (src[1]))
|
|
src++;
|
|
/* Ignore "./". */
|
|
else if (src[0] == '.' && isdirsep (src[1])
|
|
&& (src == src_start || isdirsep (src[-1])))
|
|
{
|
|
src += 2;
|
|
/* Skip /'s to the next path component. */
|
|
while (isdirsep (*src))
|
|
src++;
|
|
}
|
|
|
|
/* Backup if "..". */
|
|
else if (src[0] == '.' && src[1] == '.' && tail[-1] == '\\')
|
|
{
|
|
if (!isdirsep (src[2]) && src[2] != '\0')
|
|
*tail++ = *src++;
|
|
else
|
|
{
|
|
/* Back up over /, but not if it's the first one. */
|
|
if (tail > dst + 1)
|
|
tail--;
|
|
/* Now back up to the next /. */
|
|
while (tail > dst + 1 && tail[-1] != '\\' && tail[-2] != ':')
|
|
tail--;
|
|
src += 2;
|
|
/* Skip /'s to the next path component. */
|
|
while (isdirsep (*src))
|
|
src++;
|
|
}
|
|
}
|
|
/* Otherwise, add char to result. */
|
|
else
|
|
{
|
|
if (*src == '/')
|
|
*tail++ = '\\';
|
|
else
|
|
*tail++ = *src;
|
|
src++;
|
|
}
|
|
if ((tail - dst) >= NT_MAX_PATH)
|
|
return ENAMETOOLONG;
|
|
}
|
|
if (tail > dst + 1 && tail[-1] == '.' && tail[-2] == '\\')
|
|
tail--;
|
|
*tail = '\0';
|
|
debug_printf ("%s = normalize_win32_path (%s)", dst_start, src_start);
|
|
return 0;
|
|
}
|
|
|
|
/* Various utilities. */
|
|
|
|
/* nofinalslash: Remove trailing / and \ from SRC (except for the
|
|
first one). It is ok for src == dst. */
|
|
|
|
void __reg2
|
|
nofinalslash (const char *src, char *dst)
|
|
{
|
|
int len = strlen (src);
|
|
if (src != dst)
|
|
memcpy (dst, src, len + 1);
|
|
while (len > 1 && isdirsep (dst[--len]))
|
|
dst[len] = '\0';
|
|
}
|
|
|
|
/* conv_path_list: Convert a list of path names to/from Win32/POSIX. */
|
|
|
|
static int
|
|
conv_path_list (const char *src, char *dst, size_t size,
|
|
cygwin_conv_path_t what)
|
|
{
|
|
tmp_pathbuf tp;
|
|
char src_delim, dst_delim;
|
|
size_t len;
|
|
bool env_cvt = false;
|
|
|
|
if (what == (cygwin_conv_path_t) ENV_CVT)
|
|
{
|
|
what = CCP_WIN_A_TO_POSIX | CCP_RELATIVE;
|
|
env_cvt = true;
|
|
}
|
|
if ((what & CCP_CONVTYPE_MASK) == CCP_WIN_A_TO_POSIX)
|
|
{
|
|
src_delim = ';';
|
|
dst_delim = ':';
|
|
}
|
|
else
|
|
{
|
|
src_delim = ':';
|
|
dst_delim = ';';
|
|
}
|
|
|
|
char *srcbuf;
|
|
len = strlen (src) + 1;
|
|
if (len <= NT_MAX_PATH * sizeof (WCHAR))
|
|
srcbuf = (char *) tp.w_get ();
|
|
else
|
|
srcbuf = (char *) alloca (len);
|
|
|
|
int err = 0;
|
|
char *d = dst - 1;
|
|
bool saw_empty = false;
|
|
do
|
|
{
|
|
char *srcpath = srcbuf;
|
|
char *s = strccpy (srcpath, &src, src_delim);
|
|
size_t len = s - srcpath;
|
|
if (len >= NT_MAX_PATH)
|
|
{
|
|
err = ENAMETOOLONG;
|
|
break;
|
|
}
|
|
/* Paths in Win32 path lists in the environment (%Path%), are often
|
|
enclosed in quotes (usually paths with spaces). Trailing backslashes
|
|
are common, too. Remove them. */
|
|
if (env_cvt && len)
|
|
{
|
|
if (*srcpath == '"')
|
|
{
|
|
++srcpath;
|
|
*--s = '\0';
|
|
len -= 2;
|
|
}
|
|
while (len && s[-1] == '\\')
|
|
{
|
|
*--s = '\0';
|
|
--len;
|
|
}
|
|
}
|
|
if (len)
|
|
{
|
|
++d;
|
|
err = cygwin_conv_path (what, srcpath, d, size - (d - dst));
|
|
}
|
|
else if ((what & CCP_CONVTYPE_MASK) == CCP_POSIX_TO_WIN_A)
|
|
{
|
|
++d;
|
|
err = cygwin_conv_path (what, ".", d, size - (d - dst));
|
|
}
|
|
else
|
|
{
|
|
if (env_cvt)
|
|
saw_empty = true;
|
|
continue;
|
|
}
|
|
if (err)
|
|
break;
|
|
d = strchr (d, '\0');
|
|
*d = dst_delim;
|
|
}
|
|
while (*src++);
|
|
|
|
if (saw_empty)
|
|
err = EIDRM;
|
|
|
|
if (d < dst)
|
|
d++;
|
|
*d = '\0';
|
|
return err;
|
|
}
|
|
|
|
/********************** Symbolic Link Support **************************/
|
|
|
|
/* Create a symlink from FROMPATH to TOPATH. */
|
|
|
|
extern "C" int
|
|
symlink (const char *oldpath, const char *newpath)
|
|
{
|
|
path_conv win32_newpath;
|
|
|
|
__try
|
|
{
|
|
if (!*oldpath || !*newpath)
|
|
{
|
|
set_errno (ENOENT);
|
|
__leave;
|
|
}
|
|
|
|
/* Trailing dirsep is a no-no, only errno differs. */
|
|
bool has_trailing_dirsep = isdirsep (newpath[strlen (newpath) - 1]);
|
|
win32_newpath.check (newpath,
|
|
PC_SYM_NOFOLLOW | PC_SYM_NOFOLLOW_DIR | PC_POSIX,
|
|
stat_suffixes);
|
|
|
|
if (win32_newpath.error || has_trailing_dirsep)
|
|
{
|
|
set_errno (win32_newpath.error ?:
|
|
win32_newpath.exists () ? EEXIST : ENOENT);
|
|
__leave;
|
|
}
|
|
|
|
return symlink_worker (oldpath, win32_newpath, false);
|
|
}
|
|
__except (EFAULT) {}
|
|
__endtry
|
|
return -1;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* Count backslashes between s and e. */
|
|
static inline int
|
|
cnt_bs (PWCHAR s, PWCHAR e)
|
|
{
|
|
int num = 0;
|
|
|
|
while (s < e)
|
|
if (*s++ == L'\\')
|
|
++num;
|
|
return num;
|
|
}
|
|
|
|
#ifndef SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE
|
|
#define SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE 2
|
|
#endif
|
|
|
|
static int
|
|
symlink_native (const char *oldpath, path_conv &win32_newpath)
|
|
{
|
|
tmp_pathbuf tp;
|
|
path_conv win32_oldpath;
|
|
PUNICODE_STRING final_oldpath, final_newpath;
|
|
UNICODE_STRING final_oldpath_buf;
|
|
DWORD flags;
|
|
|
|
if (isabspath (oldpath))
|
|
{
|
|
win32_oldpath.check (oldpath, PC_SYM_NOFOLLOW, stat_suffixes);
|
|
final_oldpath = win32_oldpath.get_nt_native_path ();
|
|
}
|
|
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.get_posix (), '/')
|
|
- win32_newpath.get_posix () + 1;
|
|
char *absoldpath = tp.t_get ();
|
|
stpcpy (stpncpy (absoldpath, win32_newpath.get_posix (), len),
|
|
oldpath);
|
|
win32_oldpath.check (absoldpath, PC_SYM_NOFOLLOW, stat_suffixes);
|
|
|
|
/* Try hard to keep Windows symlink path relative. */
|
|
|
|
/* 1. Find common path prefix. Skip leading \\?\, but take pre-increment
|
|
of the following loop into account. */
|
|
PWCHAR c_old = win32_oldpath.get_nt_native_path ()->Buffer + 3;
|
|
PWCHAR c_new = win32_newpath.get_nt_native_path ()->Buffer + 3;
|
|
/* Windows compatible == always check case insensitive. */
|
|
while (towupper (*++c_old) == towupper (*++c_new))
|
|
;
|
|
/* The last component could share a common prefix, so make sure we end
|
|
up on the first char after the last common backslash. */
|
|
while (c_old[-1] != L'\\')
|
|
--c_old, --c_new;
|
|
|
|
/* 2. Check if prefix is long enough. The prefix must at least points to
|
|
a complete device: \\?\X:\ or \\?\UNC\server\share\ are the minimum
|
|
prefix strings. We start counting behind the \\?\ for speed. */
|
|
int num = cnt_bs (win32_oldpath.get_nt_native_path ()->Buffer + 4, c_old);
|
|
if (num < 1 /* locale drive. */
|
|
|| (win32_oldpath.get_nt_native_path ()->Buffer[5] != L':'
|
|
&& num < 3)) /* UNC path. */
|
|
{
|
|
/* 3a. No valid common path prefix: Create absolute symlink. */
|
|
final_oldpath = win32_oldpath.get_nt_native_path ();
|
|
}
|
|
else
|
|
{
|
|
/* 3b. Common path prefx. Count number of additional directories
|
|
in symlink's path, and prepend as much ".." path components
|
|
to the target path. */
|
|
PWCHAR e_new = win32_newpath.get_nt_native_path ()->Buffer
|
|
+ win32_newpath.get_nt_native_path ()->Length
|
|
/ sizeof (WCHAR);
|
|
num = cnt_bs (c_new, e_new);
|
|
final_oldpath = &final_oldpath_buf;
|
|
final_oldpath->Buffer = tp.w_get ();
|
|
PWCHAR e_old = final_oldpath->Buffer;
|
|
while (num-- > 0)
|
|
e_old = wcpcpy (e_old, L"..\\");
|
|
wcpcpy (e_old, c_old);
|
|
}
|
|
}
|
|
/* If the symlink target doesn't exist, don't create native symlink.
|
|
Otherwise the directory flag in the symlink is potentially wrong
|
|
when the target comes into existence, and native tools will fail.
|
|
This is so screwball. This is no problem on AFS, fortunately. */
|
|
if (!win32_oldpath.exists () && !win32_oldpath.fs_is_afs ())
|
|
{
|
|
SetLastError (ERROR_FILE_NOT_FOUND);
|
|
return -1;
|
|
}
|
|
/* Don't allow native symlinks to Cygwin special files. However, the
|
|
caller shoud know because this case shouldn't be covered by the
|
|
default "nativestrict" behaviour, so we use a special return code. */
|
|
if (win32_oldpath.isspecial ())
|
|
return -2;
|
|
/* Convert native paths to Win32 UNC paths. */
|
|
final_newpath = win32_newpath.get_nt_native_path ();
|
|
final_newpath->Buffer[1] = L'\\';
|
|
/* oldpath may be relative. Make sure to convert only absolute paths
|
|
to Win32 paths. */
|
|
if (final_oldpath->Buffer[0] == L'\\')
|
|
{
|
|
/* Starting with Windows 8.1, the ShellExecuteW function does not
|
|
handle the long path prefix correctly for symlink targets. Thus,
|
|
we create simple short paths < MAX_PATH without long path prefix. */
|
|
if (RtlEqualUnicodePathPrefix (final_oldpath, &ro_u_uncp, TRUE)
|
|
&& final_oldpath->Length < (MAX_PATH + 6) * sizeof (WCHAR))
|
|
{
|
|
final_oldpath->Buffer += 6;
|
|
final_oldpath->Buffer[0] = L'\\';
|
|
}
|
|
else if (final_oldpath->Length < (MAX_PATH + 4) * sizeof (WCHAR))
|
|
final_oldpath->Buffer += 4;
|
|
else /* Stick to long path, fix native prefix for Win32 API calls. */
|
|
final_oldpath->Buffer[1] = L'\\';
|
|
}
|
|
/* Try to create native symlink. */
|
|
flags = win32_oldpath.isdir () ? SYMBOLIC_LINK_FLAG_DIRECTORY : 0;
|
|
if (wincap.has_unprivileged_createsymlink ())
|
|
flags |= SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE;
|
|
if (!CreateSymbolicLinkW (final_newpath->Buffer, final_oldpath->Buffer,
|
|
flags))
|
|
{
|
|
/* Repair native newpath, we still need it. */
|
|
final_newpath->Buffer[1] = L'?';
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifndef IO_REPARSE_TAG_LX_SYMLINK
|
|
#define IO_REPARSE_TAG_LX_SYMLINK (0xa000001d)
|
|
#endif
|
|
|
|
typedef struct _REPARSE_LX_SYMLINK_BUFFER
|
|
{
|
|
DWORD ReparseTag;
|
|
WORD ReparseDataLength;
|
|
WORD Reserved;
|
|
struct {
|
|
DWORD FileType; /* Take member name with a grain of salt. Value is
|
|
apparently always 2 for symlinks. */
|
|
char PathBuffer[1];/* POSIX path as given to symlink(2).
|
|
Path is not \0 terminated.
|
|
Length is ReparseDataLength - sizeof (FileType).
|
|
Always UTF-8.
|
|
Chars given in incompatible codesets, e. g. umlauts
|
|
in ISO-8859-x, are converted to the Unicode
|
|
REPLACEMENT CHARACTER 0xfffd == \xef\xbf\bd */
|
|
} LxSymlinkReparseBuffer;
|
|
} REPARSE_LX_SYMLINK_BUFFER,*PREPARSE_LX_SYMLINK_BUFFER;
|
|
|
|
static int
|
|
symlink_wsl (const char *oldpath, path_conv &win32_newpath)
|
|
{
|
|
tmp_pathbuf tp;
|
|
PREPARSE_LX_SYMLINK_BUFFER rpl = (PREPARSE_LX_SYMLINK_BUFFER) tp.c_get ();
|
|
char *path_buf = rpl->LxSymlinkReparseBuffer.PathBuffer;
|
|
const int max_pathlen = MAXIMUM_REPARSE_DATA_BUFFER_SIZE
|
|
- offsetof (REPARSE_LX_SYMLINK_BUFFER,
|
|
LxSymlinkReparseBuffer.PathBuffer);
|
|
PWCHAR utf16 = tp.w_get ();
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
OBJECT_ATTRIBUTES attr;
|
|
HANDLE fh;
|
|
int len;
|
|
|
|
rpl->ReparseTag = IO_REPARSE_TAG_LX_SYMLINK;
|
|
rpl->Reserved = 0;
|
|
rpl->LxSymlinkReparseBuffer.FileType = 2;
|
|
/* Convert cygdrive prefix to "/mnt" for WSL compatibility, but only if
|
|
cygdrive prefix is not "/", otherwise suffer random "/mnt" symlinks... */
|
|
if (mount_table->cygdrive_len > 1
|
|
&& path_prefix_p (mount_table->cygdrive, oldpath,
|
|
mount_table->cygdrive_len, false))
|
|
stpcpy (stpcpy (path_buf, "/mnt"),
|
|
oldpath + mount_table->cygdrive_len - 1);
|
|
else
|
|
*stpncpy (path_buf, oldpath, max_pathlen) = '\0';
|
|
/* Convert target path to UTF-16 and then back to UTF-8 to make sure the
|
|
WSL symlink is in UTF-8, independent of the current Cygwin codeset. */
|
|
sys_mbstowcs (utf16, NT_MAX_PATH, path_buf);
|
|
len = WideCharToMultiByte (CP_UTF8, 0, utf16, -1, path_buf, max_pathlen,
|
|
NULL, NULL);
|
|
/* Length is omitting trailing \0. */
|
|
rpl->ReparseDataLength = sizeof (DWORD) + len - 1;
|
|
/* Create reparse point. */
|
|
status = NtCreateFile (&fh, DELETE | FILE_GENERIC_WRITE
|
|
| READ_CONTROL | WRITE_DAC,
|
|
win32_newpath.get_object_attr (attr, sec_none_nih),
|
|
&io, NULL, FILE_ATTRIBUTE_NORMAL,
|
|
FILE_SHARE_VALID_FLAGS, FILE_CREATE,
|
|
FILE_SYNCHRONOUS_IO_NONALERT
|
|
| FILE_NON_DIRECTORY_FILE
|
|
| FILE_OPEN_FOR_BACKUP_INTENT
|
|
| FILE_OPEN_REPARSE_POINT,
|
|
NULL, 0);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
SetLastError (RtlNtStatusToDosError (status));
|
|
return -1;
|
|
}
|
|
set_created_file_access (fh, win32_newpath, S_IFLNK | STD_RBITS | STD_WBITS);
|
|
status = NtFsControlFile (fh, NULL, NULL, NULL, &io, FSCTL_SET_REPARSE_POINT,
|
|
(LPVOID) rpl, REPARSE_DATA_BUFFER_HEADER_SIZE
|
|
+ rpl->ReparseDataLength,
|
|
NULL, 0);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
SetLastError (RtlNtStatusToDosError (status));
|
|
FILE_DISPOSITION_INFORMATION fdi = { TRUE };
|
|
status = NtSetInformationFile (fh, &io, &fdi, sizeof fdi,
|
|
FileDispositionInformation);
|
|
NtClose (fh);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("Setting delete dispostion failed, status = %y", status);
|
|
return -1;
|
|
}
|
|
NtClose (fh);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
symlink_worker (const char *oldpath, path_conv &win32_newpath, bool isdevice)
|
|
{
|
|
int res = -1;
|
|
size_t len;
|
|
char *buf, *cp;
|
|
tmp_pathbuf tp;
|
|
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
|
|
symlink contents point to existing filesystem object */
|
|
__try
|
|
{
|
|
if (strlen (oldpath) > SYMLINK_MAX)
|
|
{
|
|
set_errno (ENAMETOOLONG);
|
|
__leave;
|
|
}
|
|
|
|
/* 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. */
|
|
else if (win32_newpath.fs_is_mvfs ())
|
|
wsym_type = WSYM_lnk;
|
|
/* AFS only supports native symlinks. */
|
|
else if (win32_newpath.fs_is_afs ())
|
|
wsym_type = WSYM_nativestrict;
|
|
/* Don't try native symlinks on FSes not supporting reparse points. */
|
|
else if ((wsym_type == WSYM_native || wsym_type == WSYM_nativestrict)
|
|
&& !(win32_newpath.fs_flags () & FILE_SUPPORTS_REPARSE_POINTS))
|
|
wsym_type = WSYM_default;
|
|
|
|
/* 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 ();
|
|
stpcpy (stpcpy (newplnk, win32_newpath.get_posix ()), ".lnk");
|
|
win32_newpath.check (newplnk, PC_SYM_NOFOLLOW | PC_POSIX);
|
|
}
|
|
|
|
if (win32_newpath.error)
|
|
{
|
|
set_errno (win32_newpath.error);
|
|
__leave;
|
|
}
|
|
|
|
syscall_printf ("symlink (%s, %S) wsym_type %d", oldpath,
|
|
win32_newpath.get_nt_native_path (), wsym_type);
|
|
|
|
if ((!isdevice && win32_newpath.exists ())
|
|
|| (win32_newpath.isdevice () && !win32_newpath.is_fs_special ()))
|
|
{
|
|
set_errno (EEXIST);
|
|
__leave;
|
|
}
|
|
|
|
/* Handle NFS, native symlinks and WSL symlinks in their own functions. */
|
|
switch (wsym_type)
|
|
{
|
|
case WSYM_nfs:
|
|
res = symlink_nfs (oldpath, win32_newpath);
|
|
__leave;
|
|
case WSYM_native:
|
|
case WSYM_nativestrict:
|
|
res = symlink_native (oldpath, win32_newpath);
|
|
if (!res)
|
|
__leave;
|
|
/* Strictly native? Too bad, unless the target is a Cygwin
|
|
special file. */
|
|
if (res == -1 && wsym_type == WSYM_nativestrict)
|
|
{
|
|
__seterrno ();
|
|
__leave;
|
|
}
|
|
/* Otherwise, fall back to default symlink type. */
|
|
wsym_type = WSYM_default;
|
|
fallthrough;
|
|
case WSYM_default:
|
|
if (win32_newpath.fs_flags () & FILE_SUPPORTS_REPARSE_POINTS)
|
|
{
|
|
res = symlink_wsl (oldpath, win32_newpath);
|
|
if (!res)
|
|
__leave;
|
|
}
|
|
/* On FSes not supporting reparse points, or in case of an error
|
|
creating the WSL symlink, fall back to creating the plain old
|
|
SYSTEM file symlink. */
|
|
wsym_type = WSYM_sysfile;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
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;
|
|
char desc[MAX_PATH + 1], *relpath;
|
|
|
|
if (!isdevice)
|
|
{
|
|
/* First create an IDLIST to learn how big our shortcut is
|
|
going to be. */
|
|
IShellFolder *psl;
|
|
|
|
/* 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
|
|
{
|
|
len = strrchr (win32_newpath.get_posix (), '/')
|
|
- win32_newpath.get_posix () + 1;
|
|
char *absoldpath = tp.t_get ();
|
|
stpcpy (stpncpy (absoldpath, win32_newpath.get_posix (),
|
|
len),
|
|
oldpath);
|
|
win32_oldpath.check (absoldpath, PC_SYM_NOFOLLOW,
|
|
stat_suffixes);
|
|
}
|
|
if (SUCCEEDED (SHGetDesktopFolder (&psl)))
|
|
{
|
|
WCHAR wc_path[win32_oldpath.get_wide_win32_path_len () + 1];
|
|
win32_oldpath.get_wide_win32_path (wc_path);
|
|
/* Amazing but true: Even though the ParseDisplayName method
|
|
takes a wide char path name, it does not understand the
|
|
Win32 prefix for long pathnames! So we have to tack off
|
|
the prefix and convert the path to the "normal" syntax
|
|
for ParseDisplayName. */
|
|
PWCHAR wc = wc_path + 4;
|
|
if (wc[1] != L':') /* native UNC path */
|
|
*(wc += 2) = L'\\';
|
|
HRESULT res;
|
|
if (SUCCEEDED (res = psl->ParseDisplayName (NULL, NULL, wc,
|
|
NULL, &pidl,
|
|
NULL)))
|
|
{
|
|
ITEMIDLIST *p;
|
|
|
|
for (p = pidl; p->mkid.cb > 0;
|
|
p = (ITEMIDLIST *)((char *) p + p->mkid.cb))
|
|
;
|
|
pidl_len = (char *) p - (char *) pidl + 2;
|
|
}
|
|
psl->Release ();
|
|
}
|
|
}
|
|
/* Compute size of shortcut file. */
|
|
full_len = sizeof (win_shortcut_hdr);
|
|
if (pidl_len)
|
|
full_len += sizeof (unsigned short) + pidl_len;
|
|
oldpath_len = strlen (oldpath);
|
|
/* Unfortunately the length of the description is restricted to a
|
|
length of 2000 bytes. We don't want to add considerations for
|
|
the different lengths and even 2000 bytes is not enough for long
|
|
path names. So what we do here is to set the description to the
|
|
POSIX path only if the path is not longer than MAX_PATH characters.
|
|
We append the full path name after the regular shortcut data
|
|
(see below), which works fine with Windows Explorer as well
|
|
as older Cygwin versions (as long as the whole file isn't bigger
|
|
than 8K). The description field is only used for backward
|
|
compatibility to older Cygwin versions and those versions are
|
|
not capable of handling long path names anyway. */
|
|
desc_len = stpcpy (desc, oldpath_len > MAX_PATH
|
|
? "[path too long]" : oldpath) - desc;
|
|
full_len += sizeof (unsigned short) + desc_len;
|
|
/* Devices get the oldpath string unchanged as relative path. */
|
|
if (isdevice)
|
|
{
|
|
relpath_len = oldpath_len;
|
|
stpcpy (relpath = tp.c_get (), oldpath);
|
|
}
|
|
else
|
|
{
|
|
relpath_len = strlen (win32_oldpath.get_win32 ());
|
|
stpcpy (relpath = tp.c_get (), win32_oldpath.get_win32 ());
|
|
}
|
|
full_len += sizeof (unsigned short) + relpath_len;
|
|
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 = tp.t_get ();
|
|
else
|
|
buf = (char *) alloca (full_len + 1);
|
|
|
|
/* Create shortcut header */
|
|
win_shortcut_hdr *shortcut_header = (win_shortcut_hdr *) buf;
|
|
memset (shortcut_header, 0, sizeof *shortcut_header);
|
|
shortcut_header->size = sizeof *shortcut_header;
|
|
shortcut_header->magic = GUID_shortcut;
|
|
shortcut_header->flags = (WSH_FLAG_DESC | WSH_FLAG_RELPATH);
|
|
if (pidl)
|
|
shortcut_header->flags |= WSH_FLAG_IDLIST;
|
|
shortcut_header->run = SW_NORMAL;
|
|
cp = buf + sizeof (win_shortcut_hdr);
|
|
|
|
/* Create IDLIST */
|
|
if (pidl)
|
|
{
|
|
*(unsigned short *)cp = pidl_len;
|
|
memcpy (cp += 2, pidl, pidl_len);
|
|
cp += pidl_len;
|
|
CoTaskMemFree (pidl);
|
|
}
|
|
|
|
/* Create description */
|
|
*(unsigned short *)cp = desc_len;
|
|
cp = stpcpy (cp += 2, desc);
|
|
|
|
/* Create relpath */
|
|
*(unsigned short *)cp = relpath_len;
|
|
cp = stpcpy (cp += 2, relpath);
|
|
|
|
/* Append the POSIX path after the regular shortcut data for
|
|
the long path support. */
|
|
unsigned short *plen = (unsigned short *) cp;
|
|
cp += 2;
|
|
*(PWCHAR) cp = 0xfeff; /* BOM */
|
|
cp += 2;
|
|
*plen = sys_mbstowcs ((PWCHAR) cp, NT_MAX_PATH, oldpath)
|
|
* sizeof (WCHAR);
|
|
cp += *plen;
|
|
}
|
|
else /* wsym_type == WSYM_sysfile */
|
|
{
|
|
/* Default technique creating a symlink. */
|
|
buf = tp.t_get ();
|
|
cp = stpcpy (buf, SYMLINK_COOKIE);
|
|
*(PWCHAR) cp = 0xfeff; /* BOM */
|
|
cp += 2;
|
|
/* Note that the terminating nul is written. */
|
|
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,
|
|
sec_none_nih),
|
|
&io, 0, FILE_OPEN_FOR_BACKUP_INTENT);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
__leave;
|
|
}
|
|
status = NtSetAttributesFile (fh, FILE_ATTRIBUTE_NORMAL);
|
|
NtClose (fh);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
__leave;
|
|
}
|
|
}
|
|
else if (!isdevice && win32_newpath.has_acls ()
|
|
&& !win32_newpath.isremote ())
|
|
/* If the filesystem supports ACLs, we will overwrite the DACL after the
|
|
call to NtCreateFile. This requires a handle with READ_CONTROL and
|
|
WRITE_DAC access, otherwise get_file_sd and set_file_sd both have to
|
|
open the file again.
|
|
FIXME: On remote NTFS shares open sometimes fails because even the
|
|
creator of the file doesn't have the right to change the DACL.
|
|
I don't know what setting that is or how to recognize such a share,
|
|
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, sec_none_nih),
|
|
&io, NULL, FILE_ATTRIBUTE_NORMAL,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
isdevice ? FILE_OVERWRITE_IF : FILE_CREATE,
|
|
FILE_SYNCHRONOUS_IO_NONALERT
|
|
| FILE_NON_DIRECTORY_FILE
|
|
| FILE_OPEN_FOR_BACKUP_INTENT,
|
|
NULL, 0);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
__leave;
|
|
}
|
|
if (io.Information == FILE_CREATED && win32_newpath.has_acls ())
|
|
set_created_file_access (fh, win32_newpath,
|
|
S_IFLNK | STD_RBITS | STD_WBITS);
|
|
status = NtWriteFile (fh, NULL, NULL, NULL, &io, buf, cp - buf,
|
|
NULL, NULL);
|
|
if (NT_SUCCESS (status) && io.Information == (ULONG) (cp - buf))
|
|
{
|
|
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;
|
|
}
|
|
else
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
FILE_DISPOSITION_INFORMATION fdi = { TRUE };
|
|
status = NtSetInformationFile (fh, &io, &fdi, sizeof fdi,
|
|
FileDispositionInformation);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("Setting delete dispostion failed, status = %y",
|
|
status);
|
|
}
|
|
NtClose (fh);
|
|
|
|
}
|
|
__except (EFAULT) {}
|
|
__endtry
|
|
syscall_printf ("%d = symlink_worker(%s, %s, %d)",
|
|
res, oldpath, win32_newpath.get_posix (), isdevice);
|
|
return res;
|
|
}
|
|
|
|
static bool
|
|
cmp_shortcut_header (win_shortcut_hdr *file_header)
|
|
{
|
|
/* A Cygwin or U/Win shortcut only contains a description and a relpath.
|
|
Cygwin shortcuts also might contain an ITEMIDLIST. The run type is
|
|
always set to SW_NORMAL. */
|
|
return file_header->size == sizeof (win_shortcut_hdr)
|
|
&& !memcmp (&file_header->magic, &GUID_shortcut, sizeof GUID_shortcut)
|
|
&& (file_header->flags & ~WSH_FLAG_IDLIST)
|
|
== (WSH_FLAG_DESC | WSH_FLAG_RELPATH)
|
|
&& file_header->run == SW_NORMAL;
|
|
}
|
|
|
|
int
|
|
symlink_info::check_shortcut (HANDLE h)
|
|
{
|
|
tmp_pathbuf tp;
|
|
win_shortcut_hdr *file_header;
|
|
char *buf, *cp;
|
|
unsigned short len;
|
|
int res = 0;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
FILE_STANDARD_INFORMATION fsi;
|
|
LARGE_INTEGER off = { QuadPart:0LL };
|
|
|
|
status = NtQueryInformationFile (h, &io, &fsi, sizeof fsi,
|
|
FileStandardInformation);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
set_error (EIO);
|
|
return 0;
|
|
}
|
|
if (fsi.EndOfFile.QuadPart <= (LONGLONG) sizeof (win_shortcut_hdr)
|
|
|| fsi.EndOfFile.QuadPart > 4 * 65536)
|
|
return 0;
|
|
if (fsi.EndOfFile.LowPart < NT_MAX_PATH * sizeof (WCHAR))
|
|
buf = (char *) tp.w_get ();
|
|
else
|
|
buf = (char *) alloca (fsi.EndOfFile.LowPart + 1);
|
|
status = NtReadFile (h, NULL, NULL, NULL, &io, buf, fsi.EndOfFile.LowPart,
|
|
&off, NULL);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
if (status != STATUS_END_OF_FILE)
|
|
set_error (EIO);
|
|
return 0;
|
|
}
|
|
file_header = (win_shortcut_hdr *) buf;
|
|
if (io.Information != fsi.EndOfFile.LowPart
|
|
|| !cmp_shortcut_header (file_header))
|
|
return 0;
|
|
cp = buf + sizeof (win_shortcut_hdr);
|
|
if (file_header->flags & WSH_FLAG_IDLIST) /* Skip ITEMIDLIST */
|
|
cp += *(unsigned short *) cp + 2;
|
|
if (!(len = *(unsigned short *) cp))
|
|
return 0;
|
|
cp += 2;
|
|
/* Check if this is a device file - these start with the sequence :\\ */
|
|
if (strncmp (cp, ":\\", 2) == 0)
|
|
res = strlen (strcpy (contents, cp)); /* Don't mess with device files */
|
|
else
|
|
{
|
|
/* Has appended full path? If so, use it instead of description. */
|
|
unsigned short relpath_len = *(unsigned short *) (cp + len);
|
|
if (cp + len + 2 + relpath_len < buf + fsi.EndOfFile.LowPart)
|
|
{
|
|
cp += len + 2 + relpath_len;
|
|
len = *(unsigned short *) cp;
|
|
cp += 2;
|
|
}
|
|
if (*(PWCHAR) cp == 0xfeff) /* BOM */
|
|
{
|
|
char *tmpbuf = tp.c_get ();
|
|
if (sys_wcstombs (tmpbuf, NT_MAX_PATH, (PWCHAR) (cp + 2))
|
|
> SYMLINK_MAX)
|
|
return 0;
|
|
res = posixify (tmpbuf);
|
|
}
|
|
else if (len > SYMLINK_MAX)
|
|
return 0;
|
|
else
|
|
{
|
|
cp[len] = '\0';
|
|
res = posixify (cp);
|
|
}
|
|
}
|
|
if (res) /* It's a symlink. */
|
|
path_flags |= PATH_SYMLINK | PATH_LNK;
|
|
return res;
|
|
}
|
|
|
|
int
|
|
symlink_info::check_sysfile (HANDLE h)
|
|
{
|
|
tmp_pathbuf tp;
|
|
char cookie_buf[sizeof (SYMLINK_COOKIE) - 1];
|
|
char *srcbuf = tp.c_get ();
|
|
int res = 0;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
bool interix_symlink = false;
|
|
LARGE_INTEGER off = { QuadPart:0LL };
|
|
|
|
status = NtReadFile (h, NULL, NULL, NULL, &io, cookie_buf,
|
|
sizeof (cookie_buf), &off, NULL);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("ReadFile1 failed %y", status);
|
|
if (status != STATUS_END_OF_FILE)
|
|
set_error (EIO);
|
|
return 0;
|
|
}
|
|
off.QuadPart = io.Information;
|
|
if (io.Information == sizeof (cookie_buf)
|
|
&& memcmp (cookie_buf, SYMLINK_COOKIE, sizeof (cookie_buf)) == 0)
|
|
{
|
|
/* It's a symlink. */
|
|
path_flags |= PATH_SYMLINK;
|
|
}
|
|
else if (io.Information == sizeof (cookie_buf)
|
|
&& memcmp (cookie_buf, SOCKET_COOKIE, sizeof (cookie_buf)) == 0)
|
|
path_flags |= PATH_SOCKET;
|
|
else if (io.Information >= sizeof (INTERIX_SYMLINK_COOKIE)
|
|
&& memcmp (cookie_buf, INTERIX_SYMLINK_COOKIE,
|
|
sizeof (INTERIX_SYMLINK_COOKIE) - 1) == 0)
|
|
{
|
|
/* It's an Interix symlink. */
|
|
path_flags |= PATH_SYMLINK;
|
|
interix_symlink = true;
|
|
/* Interix symlink cookies are shorter than Cygwin symlink cookies, so
|
|
in case of an Interix symlink cooky we have read too far into the
|
|
file. Set file pointer back to the position right after the cookie. */
|
|
off.QuadPart = sizeof (INTERIX_SYMLINK_COOKIE) - 1;
|
|
}
|
|
if (path_flags & PATH_SYMLINK)
|
|
{
|
|
status = NtReadFile (h, NULL, NULL, NULL, &io, srcbuf,
|
|
NT_MAX_PATH, &off, NULL);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("ReadFile2 failed");
|
|
if (status != STATUS_END_OF_FILE)
|
|
set_error (EIO);
|
|
}
|
|
else if (*(PWCHAR) srcbuf == 0xfeff /* BOM */
|
|
|| interix_symlink)
|
|
{
|
|
/* Add trailing 0 to Interix symlink target. Skip BOM in Cygwin
|
|
symlinks. */
|
|
if (interix_symlink)
|
|
((PWCHAR) srcbuf)[io.Information / sizeof (WCHAR)] = L'\0';
|
|
else
|
|
srcbuf += 2;
|
|
char *tmpbuf = tp.c_get ();
|
|
if (sys_wcstombs (tmpbuf, NT_MAX_PATH, (PWCHAR) srcbuf)
|
|
> SYMLINK_MAX)
|
|
debug_printf ("symlink string too long");
|
|
else
|
|
res = posixify (tmpbuf);
|
|
}
|
|
else if (io.Information > SYMLINK_MAX + 1)
|
|
debug_printf ("symlink string too long");
|
|
else
|
|
res = posixify (srcbuf);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
typedef struct _REPARSE_APPEXECLINK_BUFFER
|
|
{
|
|
DWORD ReparseTag;
|
|
WORD ReparseDataLength;
|
|
WORD Reserved;
|
|
struct {
|
|
DWORD Version; /* Take member name with a grain of salt. */
|
|
WCHAR Strings[1]; /* Four serialized, NUL-terminated WCHAR strings:
|
|
- Package ID
|
|
- Entry Point
|
|
- Executable Path
|
|
- Application Type
|
|
We're only interested in the Executable Path */
|
|
} AppExecLinkReparseBuffer;
|
|
} REPARSE_APPEXECLINK_BUFFER,*PREPARSE_APPEXECLINK_BUFFER;
|
|
|
|
static bool
|
|
check_reparse_point_string (PUNICODE_STRING subst)
|
|
{
|
|
/* Native mount points, or native non-relative symbolic links,
|
|
can be treated as posix symlinks only if the SubstituteName
|
|
can be converted from a native NT object namespace name to
|
|
a win32 name. We only know how to convert names with two
|
|
prefixes :
|
|
"\??\UNC\..."
|
|
"\??\X:..."
|
|
Other reparse points will be treated as files or
|
|
directories, not as posix symlinks.
|
|
*/
|
|
if (RtlEqualUnicodePathPrefix (subst, &ro_u_natp, FALSE))
|
|
{
|
|
if (subst->Length >= 6 * sizeof(WCHAR) && subst->Buffer[5] == L':' &&
|
|
(subst->Length == 6 * sizeof(WCHAR) || subst->Buffer[6] == L'\\'))
|
|
return true;
|
|
else if (subst->Length >= 8 * sizeof(WCHAR) &&
|
|
wcsncmp (subst->Buffer + 4, L"UNC\\", 4) == 0)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* Return values:
|
|
<0: Negative errno.
|
|
0: Not a reparse point recognized by us.
|
|
>0: Path flags for a recognized reparse point, always including PATH_REP.
|
|
*/
|
|
int
|
|
check_reparse_point_target (HANDLE h, bool remote, PREPARSE_DATA_BUFFER rp,
|
|
PUNICODE_STRING psymbuf)
|
|
{
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
|
|
/* On remote drives or under heavy load, NtFsControlFile can return with
|
|
STATUS_PENDING. If so, instead of creating an event object, just set
|
|
io.Status to an invalid value and perform a minimal wait until io.Status
|
|
changed. */
|
|
memset (&io, 0xff, sizeof io);
|
|
status = NtFsControlFile (h, NULL, NULL, NULL, &io,
|
|
FSCTL_GET_REPARSE_POINT, NULL, 0, (LPVOID) rp,
|
|
MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
|
|
if (status == STATUS_PENDING)
|
|
{
|
|
while (io.Status == (NTSTATUS) 0xffffffff)
|
|
Sleep (1L);
|
|
status = io.Status;
|
|
}
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("NtFsControlFile(FSCTL_GET_REPARSE_POINT) failed, %y",
|
|
status);
|
|
/* When accessing the root dir of some remote drives (observed with
|
|
OS X shares), the FILE_ATTRIBUTE_REPARSE_POINT flag is set, but
|
|
the followup call to NtFsControlFile(FSCTL_GET_REPARSE_POINT)
|
|
returns with STATUS_NOT_A_REPARSE_POINT. That's quite buggy, but
|
|
we cope here with this scenario by not setting an error code. */
|
|
if (status == STATUS_NOT_A_REPARSE_POINT)
|
|
return 0;
|
|
return -EIO;
|
|
}
|
|
if (rp->ReparseTag == IO_REPARSE_TAG_SYMLINK)
|
|
{
|
|
/* Windows evaluates native symlink literally. If a remote symlink points
|
|
to, say, C:\foo, it will be handled as if the target is the local file
|
|
C:\foo. That comes in handy since that's how symlinks are treated under
|
|
POSIX as well. */
|
|
RtlInitCountedUnicodeString (psymbuf,
|
|
(PWCHAR)((PBYTE) rp->SymbolicLinkReparseBuffer.PathBuffer
|
|
+ rp->SymbolicLinkReparseBuffer.SubstituteNameOffset),
|
|
rp->SymbolicLinkReparseBuffer.SubstituteNameLength);
|
|
if ((rp->SymbolicLinkReparseBuffer.Flags & SYMLINK_FLAG_RELATIVE) ||
|
|
check_reparse_point_string (psymbuf))
|
|
return PATH_SYMLINK | PATH_REP;
|
|
}
|
|
else if (!remote && rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
|
|
{
|
|
/* Don't handle junctions on remote filesystems as symlinks. This type
|
|
of reparse point is handled transparently by the OS so that the
|
|
target of the junction is the remote directory it is supposed to
|
|
point to. If we handle it as symlink, it will be mistreated as
|
|
pointing to a dir on the local system. */
|
|
RtlInitCountedUnicodeString (psymbuf,
|
|
(PWCHAR)((PBYTE) rp->MountPointReparseBuffer.PathBuffer
|
|
+ rp->MountPointReparseBuffer.SubstituteNameOffset),
|
|
rp->MountPointReparseBuffer.SubstituteNameLength);
|
|
if (RtlEqualUnicodePathPrefix (psymbuf, &ro_u_volume, TRUE))
|
|
{
|
|
/* Volume mount point. Not treated as symlink. The return
|
|
value -EPERM is a hint for the caller to treat this as a
|
|
volume mount point. */
|
|
return -EPERM;
|
|
}
|
|
if (check_reparse_point_string (psymbuf))
|
|
return PATH_SYMLINK | PATH_REP;
|
|
}
|
|
else if (!remote && rp->ReparseTag == IO_REPARSE_TAG_APPEXECLINK)
|
|
{
|
|
/* App execution aliases are commonly used by Windows Store apps. */
|
|
PREPARSE_APPEXECLINK_BUFFER rpl = (PREPARSE_APPEXECLINK_BUFFER) rp;
|
|
WCHAR *buf = rpl->AppExecLinkReparseBuffer.Strings;
|
|
DWORD size = rp->ReparseDataLength / sizeof (WCHAR), n;
|
|
|
|
/* It seems that app execution aliases have a payload of four
|
|
NUL-separated wide string: package id, entry point, executable
|
|
and application type. We're interested in the executable. */
|
|
for (int i = 0; i < 3 && size > 0; i++)
|
|
{
|
|
n = wcsnlen (buf, size - 1);
|
|
if (i == 2 && n > 0 && n < size)
|
|
{
|
|
RtlInitCountedUnicodeString (psymbuf, buf, n * sizeof (WCHAR));
|
|
return PATH_SYMLINK | PATH_REP;
|
|
}
|
|
if (i == 2)
|
|
break;
|
|
buf += n + 1;
|
|
size -= n + 1;
|
|
}
|
|
}
|
|
else if (rp->ReparseTag == IO_REPARSE_TAG_LX_SYMLINK)
|
|
{
|
|
/* WSL symlink. Problem: We have to convert the path to UTF-16 for
|
|
the caller. Reparse points are 16K max. The buffer given to rp
|
|
is 32K. So there's enough trailing space in the buffer to convert
|
|
to UTF-16 and let psymbuf point to it. */
|
|
PREPARSE_LX_SYMLINK_BUFFER rpl = (PREPARSE_LX_SYMLINK_BUFFER) rp;
|
|
char *path_buf = rpl->LxSymlinkReparseBuffer.PathBuffer;
|
|
DWORD path_len = rpl->ReparseDataLength - sizeof (DWORD);
|
|
bool full_path = false;
|
|
const size_t drv_prefix_len = strlen ("/mnt");
|
|
PBYTE utf16_ptr;
|
|
PWCHAR utf16_buf;
|
|
int utf16_bufsize;
|
|
|
|
/* 0-terminate path_buf for easier testing. */
|
|
path_buf[path_len] = '\0';
|
|
if (path_prefix_p ("/mnt", path_buf, drv_prefix_len, false))
|
|
{
|
|
size_t len = strlen (path_buf);
|
|
|
|
if (len <= drv_prefix_len + 1)
|
|
{
|
|
/* /mnt or /mnt/. Replace with cygdrive prefix. */
|
|
stpcpy (path_buf, mount_table->cygdrive);
|
|
path_len = mount_table->cygdrive_len;
|
|
if (len == drv_prefix_len)
|
|
{
|
|
path_buf[mount_table->cygdrive_len - 1] = '\0';
|
|
--path_len;
|
|
}
|
|
rp->ReparseDataLength = path_len + sizeof (DWORD);
|
|
}
|
|
else if (islower (path_buf[drv_prefix_len + 1])
|
|
&& (path_len == drv_prefix_len + 2
|
|
|| path_buf[drv_prefix_len + 2] == '/'))
|
|
{
|
|
/* Skip forward to the slash leading the drive letter.
|
|
That leaves room for adding the colon. */
|
|
path_buf += drv_prefix_len;
|
|
path_len -= drv_prefix_len;
|
|
full_path = true;
|
|
}
|
|
}
|
|
/* Compute buffer for path converted to UTF-16. */
|
|
utf16_ptr = (PBYTE) rpl + sizeof (REPARSE_LX_SYMLINK_BUFFER)
|
|
+ rp->ReparseDataLength;
|
|
/* Skip \0-termination added above. */
|
|
++utf16_ptr;
|
|
/* Make sure pointer is aligned */
|
|
while ((intptr_t) utf16_ptr % sizeof (WCHAR))
|
|
++utf16_ptr;
|
|
utf16_buf = (PWCHAR) utf16_ptr;
|
|
utf16_bufsize = NT_MAX_PATH - (utf16_buf - (PWCHAR) rpl);
|
|
/* Now convert path to UTF-16. */
|
|
utf16_bufsize = MultiByteToWideChar (CP_UTF8, 0, path_buf, path_len,
|
|
utf16_buf, utf16_bufsize);
|
|
if (utf16_bufsize)
|
|
{
|
|
if (full_path)
|
|
{
|
|
utf16_buf[0] = utf16_buf[1]; /* Move drive letter to front */
|
|
utf16_buf[1] = L':'; /* Add colon */
|
|
}
|
|
RtlInitCountedUnicodeString (psymbuf, utf16_buf,
|
|
utf16_bufsize * sizeof (WCHAR));
|
|
return PATH_SYMLINK | PATH_REP | PATH_REP_NOAPI;
|
|
}
|
|
return -EIO;
|
|
}
|
|
else if (rp->ReparseTag == IO_REPARSE_TAG_CYGUNIX)
|
|
{
|
|
PREPARSE_GUID_DATA_BUFFER rgp = (PREPARSE_GUID_DATA_BUFFER) rp;
|
|
|
|
if (memcmp (CYGWIN_SOCKET_GUID, &rgp->ReparseGuid, sizeof (GUID)) == 0)
|
|
#ifdef __WITH_AF_UNIX
|
|
return PATH_SOCKET | PATH_REP | PATH_REP_NOAPI;
|
|
#else
|
|
/* Recognize this as a reparse point but not as a socket. */
|
|
return PATH_REP | PATH_REP_NOAPI;
|
|
#endif
|
|
}
|
|
else if (rp->ReparseTag == IO_REPARSE_TAG_AF_UNIX)
|
|
/* Native Windows AF_UNIX socket; recognize this as a reparse
|
|
point but not as a socket. */
|
|
return PATH_REP;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
symlink_info::check_reparse_point (HANDLE h, bool remote)
|
|
{
|
|
tmp_pathbuf tp;
|
|
PREPARSE_DATA_BUFFER rp = (PREPARSE_DATA_BUFFER) tp.c_get ();
|
|
UNICODE_STRING symbuf;
|
|
char srcbuf[SYMLINK_MAX + 7];
|
|
|
|
int ret = check_reparse_point_target (h, remote, rp, &symbuf);
|
|
if (ret <= 0)
|
|
{
|
|
if (ret == -EIO)
|
|
{
|
|
set_error (EIO);
|
|
return 0;
|
|
}
|
|
/* Maybe it's a reparse point, but it's certainly not one we recognize.
|
|
Drop REPARSE attribute so we don't try to use the flag accidentally.
|
|
It's just some arbitrary file or directory for us. */
|
|
fileattr &= ~FILE_ATTRIBUTE_REPARSE_POINT;
|
|
return ret;
|
|
}
|
|
/* ret is > 0, so it's a known reparse point, path in symbuf. */
|
|
path_flags |= ret;
|
|
if (ret & PATH_SYMLINK)
|
|
{
|
|
sys_wcstombs (srcbuf, SYMLINK_MAX + 7, symbuf.Buffer,
|
|
symbuf.Length / sizeof (WCHAR));
|
|
/* A symlink is never a directory. */
|
|
fileattr &= ~FILE_ATTRIBUTE_DIRECTORY;
|
|
return posixify (srcbuf);
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
symlink_info::check_nfs_symlink (HANDLE h)
|
|
{
|
|
tmp_pathbuf tp;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
struct {
|
|
FILE_GET_EA_INFORMATION fgei;
|
|
char buf[sizeof (NFS_SYML_TARGET)];
|
|
} fgei_buf;
|
|
PFILE_FULL_EA_INFORMATION pffei;
|
|
int res = 0;
|
|
|
|
/* To find out if the file is a symlink and to get the symlink target,
|
|
try to fetch the NfsSymlinkTargetName EA. */
|
|
fgei_buf.fgei.NextEntryOffset = 0;
|
|
fgei_buf.fgei.EaNameLength = sizeof (NFS_SYML_TARGET) - 1;
|
|
stpcpy (fgei_buf.fgei.EaName, NFS_SYML_TARGET);
|
|
pffei = (PFILE_FULL_EA_INFORMATION) tp.w_get ();
|
|
status = NtQueryEaFile (h, &io, pffei, NT_MAX_PATH * sizeof (WCHAR), TRUE,
|
|
&fgei_buf.fgei, sizeof fgei_buf, NULL, TRUE);
|
|
if (NT_SUCCESS (status) && pffei->EaValueLength > 0)
|
|
{
|
|
PWCHAR spath = (PWCHAR)
|
|
(pffei->EaName + pffei->EaNameLength + 1);
|
|
res = sys_wcstombs (contents, SYMLINK_MAX + 1,
|
|
spath, pffei->EaValueLength);
|
|
path_flags |= PATH_SYMLINK;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
int
|
|
symlink_info::posixify (char *srcbuf)
|
|
{
|
|
/* The definition for a path in a native symlink is a bit weird. The Flags
|
|
value seem to contain 0 for absolute paths (stored as NT native path)
|
|
and 1 for relative paths. Relative paths are paths not starting with a
|
|
drive letter. These are not converted to NT native, but stored as
|
|
given. A path starting with a single backslash is relative to the
|
|
current drive thus a "relative" value (Flags == 1).
|
|
Funny enough it's possible to store paths with slashes instead of
|
|
backslashes, but they are evaluated incorrectly by subsequent Windows
|
|
calls like CreateFile (ERROR_INVALID_NAME). So, what we do here is to
|
|
take paths starting with slashes at face value, evaluating them as
|
|
Cygwin specific POSIX paths.
|
|
A path starting with two slashes(!) or backslashes is converted into an
|
|
NT UNC path. Unfortunately, in contrast to POSIX rules, paths starting
|
|
with three or more (back)slashes are also converted into UNC paths,
|
|
just incorrectly sticking to one redundant leading backslash. We go
|
|
along with this behaviour to avoid scenarios in which native tools access
|
|
other files than Cygwin.
|
|
The above rules are used exactly the same way on Cygwin specific symlinks
|
|
(sysfiles and shortcuts) to eliminate non-POSIX paths in the output. */
|
|
|
|
/* Eliminate native NT prefixes. */
|
|
if (srcbuf[0] == '\\' && !strncmp (srcbuf + 1, "??\\", 3))
|
|
{
|
|
srcbuf += 4;
|
|
if (srcbuf[1] != ':') /* native UNC path */
|
|
*(srcbuf += 2) = '\\';
|
|
}
|
|
if (isdrive (srcbuf))
|
|
mount_table->conv_to_posix_path (srcbuf, contents, 0);
|
|
else if (srcbuf[0] == '\\')
|
|
{
|
|
if (srcbuf[1] == '\\') /* UNC path */
|
|
slashify (srcbuf, contents, 0);
|
|
else /* Paths starting with \ are current drive relative. */
|
|
{
|
|
char cvtbuf[SYMLINK_MAX + 1];
|
|
|
|
stpcpy (cvtbuf + cygheap->cwd.get_drive (cvtbuf), srcbuf);
|
|
mount_table->conv_to_posix_path (cvtbuf, contents, 0);
|
|
}
|
|
}
|
|
else /* Everything else is taken as is. */
|
|
slashify (srcbuf, contents, 0);
|
|
return strlen (contents);
|
|
}
|
|
|
|
enum
|
|
{
|
|
SCAN_BEG,
|
|
SCAN_LNK,
|
|
SCAN_HASLNK,
|
|
SCAN_JUSTCHECK,
|
|
SCAN_JUSTCHECKTHIS, /* Never try to append a suffix. */
|
|
SCAN_APPENDLNK,
|
|
SCAN_EXTRALNK,
|
|
SCAN_DONE,
|
|
};
|
|
|
|
class suffix_scan
|
|
{
|
|
const suffix_info *suffixes, *suffixes_start;
|
|
int nextstate;
|
|
char *eopath;
|
|
size_t namelen;
|
|
public:
|
|
const char *path;
|
|
char *has (const char *, const suffix_info *);
|
|
int next ();
|
|
int lnk_match () {return nextstate >= SCAN_APPENDLNK;}
|
|
size_t name_len () {return namelen;}
|
|
};
|
|
|
|
char *
|
|
suffix_scan::has (const char *in_path, const suffix_info *in_suffixes)
|
|
{
|
|
nextstate = SCAN_BEG;
|
|
suffixes = suffixes_start = in_suffixes;
|
|
|
|
const char *fname = strrchr (in_path, '\\');
|
|
fname = fname ? fname + 1 : in_path;
|
|
char *ext_here = strrchr (fname, '.');
|
|
path = in_path;
|
|
eopath = strchr (path, '\0');
|
|
|
|
if (!ext_here)
|
|
goto noext;
|
|
|
|
if (suffixes)
|
|
{
|
|
/* Check if the extension matches a known extension */
|
|
for (const suffix_info *ex = in_suffixes; ex->name != NULL; ex++)
|
|
if (ascii_strcasematch (ext_here, ex->name))
|
|
{
|
|
nextstate = SCAN_JUSTCHECK;
|
|
suffixes = NULL; /* Has an extension so don't scan for one. */
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/* Didn't match. Use last resort -- .lnk. */
|
|
if (ascii_strcasematch (ext_here, ".lnk"))
|
|
{
|
|
nextstate = SCAN_HASLNK;
|
|
suffixes = NULL;
|
|
}
|
|
|
|
noext:
|
|
ext_here = eopath;
|
|
|
|
done:
|
|
namelen = eopath - fname;
|
|
/* Avoid attaching suffixes if the resulting filename would be invalid.
|
|
For performance reasons we don't check the length of a suffix, since
|
|
we know that all suffixes are 4 chars in length.
|
|
|
|
FIXME: This is not really correct. A fully functional test should
|
|
work on wide character paths. This would probably also speed
|
|
up symlink_info::check. */
|
|
if (namelen > NAME_MAX - 4)
|
|
{
|
|
nextstate = SCAN_JUSTCHECKTHIS;
|
|
suffixes = NULL;
|
|
}
|
|
return ext_here;
|
|
}
|
|
|
|
int
|
|
suffix_scan::next ()
|
|
{
|
|
for (;;)
|
|
{
|
|
if (!suffixes)
|
|
switch (nextstate)
|
|
{
|
|
case SCAN_BEG:
|
|
suffixes = suffixes_start;
|
|
if (!suffixes)
|
|
{
|
|
nextstate = SCAN_LNK;
|
|
return 1;
|
|
}
|
|
nextstate = SCAN_EXTRALNK;
|
|
/* fall through to suffix checking below */
|
|
break;
|
|
case SCAN_HASLNK:
|
|
nextstate = SCAN_APPENDLNK; /* Skip SCAN_BEG */
|
|
return 1;
|
|
case SCAN_EXTRALNK:
|
|
nextstate = SCAN_DONE;
|
|
*eopath = '\0';
|
|
return 0;
|
|
case SCAN_JUSTCHECK:
|
|
nextstate = SCAN_LNK;
|
|
return 1;
|
|
case SCAN_JUSTCHECKTHIS:
|
|
nextstate = SCAN_DONE;
|
|
return 1;
|
|
case SCAN_LNK:
|
|
case SCAN_APPENDLNK:
|
|
nextstate = SCAN_DONE;
|
|
if (namelen + (*eopath ? 8 : 4) > NAME_MAX)
|
|
{
|
|
*eopath = '\0';
|
|
return 0;
|
|
}
|
|
strcat (eopath, ".lnk");
|
|
return 1;
|
|
default:
|
|
*eopath = '\0';
|
|
return 0;
|
|
}
|
|
|
|
while (suffixes && suffixes->name)
|
|
if (nextstate == SCAN_EXTRALNK
|
|
&& (!suffixes->addon || namelen > NAME_MAX - 8))
|
|
suffixes++;
|
|
else
|
|
{
|
|
strcpy (eopath, suffixes->name);
|
|
if (nextstate == SCAN_EXTRALNK)
|
|
strcat (eopath, ".lnk");
|
|
suffixes++;
|
|
return 1;
|
|
}
|
|
suffixes = NULL;
|
|
}
|
|
}
|
|
|
|
bool
|
|
symlink_info::set_error (int in_errno)
|
|
{
|
|
bool res;
|
|
if (!(pc_flags & PC_NO_ACCESS_CHECK)
|
|
|| in_errno == ENAMETOOLONG || in_errno == EIO)
|
|
{
|
|
error = in_errno;
|
|
res = true;
|
|
}
|
|
else if (in_errno == ENOENT)
|
|
res = true;
|
|
else
|
|
{
|
|
fileattr = FILE_ATTRIBUTE_NORMAL;
|
|
res = false;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
bool
|
|
symlink_info::parse_device (const char *contents)
|
|
{
|
|
char *endptr;
|
|
_major_t mymajor;
|
|
_major_t myminor;
|
|
__mode_t mymode;
|
|
|
|
mymajor = strtol (contents += 2, &endptr, 16);
|
|
if (endptr == contents)
|
|
return isdevice = false;
|
|
|
|
contents = endptr;
|
|
myminor = strtol (++contents, &endptr, 16);
|
|
if (endptr == contents)
|
|
return isdevice = false;
|
|
|
|
contents = endptr;
|
|
mymode = strtol (++contents, &endptr, 16);
|
|
if (endptr == contents)
|
|
return isdevice = false;
|
|
|
|
if ((mymode & S_IFMT) == S_IFIFO)
|
|
{
|
|
mymajor = _major (FH_FIFO);
|
|
myminor = _minor (FH_FIFO);
|
|
}
|
|
|
|
major = mymajor;
|
|
minor = myminor;
|
|
mode = mymode;
|
|
return isdevice = true;
|
|
}
|
|
|
|
/* Check if PATH is a symlink. PATH must be a valid Win32 path name.
|
|
|
|
If PATH is a symlink, put the value of the symlink--the file to
|
|
which it points--into BUF. The value stored in BUF is not
|
|
necessarily null terminated. BUFLEN is the length of BUF; only up
|
|
to BUFLEN characters will be stored in BUF. BUF may be NULL, in
|
|
which case nothing will be stored.
|
|
|
|
Set *SYML if PATH is a symlink.
|
|
|
|
Set *EXEC if PATH appears to be executable. This is an efficiency
|
|
hack because we sometimes have to open the file anyhow. *EXEC will
|
|
not be set for every executable file.
|
|
|
|
Return -1 on error, 0 if PATH is not a symlink, or the length
|
|
stored into BUF if PATH is a symlink. */
|
|
|
|
int
|
|
symlink_info::check (char *path, const suffix_info *suffixes, fs_info &fs,
|
|
path_conv_handle &conv_hdl)
|
|
{
|
|
int res;
|
|
HANDLE h;
|
|
NTSTATUS status;
|
|
UNICODE_STRING upath;
|
|
OBJECT_ATTRIBUTES attr;
|
|
IO_STATUS_BLOCK io;
|
|
suffix_scan suffix;
|
|
|
|
const ULONG ci_flag = cygwin_shared->obcaseinsensitive
|
|
|| (mount_flags & MOUNT_NOPOSIX)
|
|
? OBJ_CASE_INSENSITIVE : 0;
|
|
/* TODO: Temporarily do all char->UNICODE conversion here. This should
|
|
already be slightly faster than using Ascii functions. */
|
|
tmp_pathbuf tp;
|
|
tp.u_get (&upath);
|
|
InitializeObjectAttributes (&attr, &upath, ci_flag, NULL, NULL);
|
|
|
|
/* This label is used in case we encounter a FS which only handles
|
|
DOS paths. See below. */
|
|
bool restarted = false;
|
|
restart:
|
|
|
|
h = NULL;
|
|
res = 0;
|
|
contents[0] = '\0';
|
|
issymlink = true;
|
|
isdevice = false;
|
|
major = 0;
|
|
minor = 0;
|
|
mode = 0;
|
|
// mount_flags is an incoming value set in path_conv */
|
|
path_flags = 0;
|
|
|
|
PVOID eabuf = &nfs_aol_ffei;
|
|
ULONG easize = sizeof nfs_aol_ffei;
|
|
|
|
ext_here = suffix.has (path, suffixes);
|
|
extn = ext_here - path;
|
|
bool had_ext = !!*ext_here;
|
|
|
|
/* If the filename is too long, don't even try. */
|
|
if (suffix.name_len () > NAME_MAX)
|
|
{
|
|
set_error (ENAMETOOLONG);
|
|
goto file_not_symlink;
|
|
}
|
|
|
|
while (suffix.next ())
|
|
{
|
|
error = 0;
|
|
get_nt_native_path (suffix.path, upath, mount_flags & MOUNT_DOS);
|
|
if (h)
|
|
{
|
|
NtClose (h);
|
|
h = NULL;
|
|
}
|
|
/* The EA given to NtCreateFile allows to get a handle to a symlink on
|
|
an NFS share, rather than getting a handle to the target of the
|
|
symlink (which would spoil the task of this method quite a bit).
|
|
Fortunately it's ignored on most other file systems so we don't have
|
|
to special case NFS too much. */
|
|
status = NtCreateFile (&h,
|
|
READ_CONTROL | FILE_READ_ATTRIBUTES | FILE_READ_EA,
|
|
&attr, &io, NULL, 0, FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN,
|
|
FILE_OPEN_REPARSE_POINT
|
|
| FILE_OPEN_FOR_BACKUP_INTENT,
|
|
eabuf, easize);
|
|
debug_printf ("%y = NtCreateFile (%S)", status, &upath);
|
|
/* No right to access EAs or EAs not supported? */
|
|
if (!NT_SUCCESS (status)
|
|
&& (status == STATUS_ACCESS_DENIED
|
|
|| status == STATUS_EAS_NOT_SUPPORTED
|
|
|| status == STATUS_NOT_SUPPORTED
|
|
|| status == STATUS_INVALID_NETWORK_RESPONSE
|
|
/* Or a bug in Samba 3.2.x (x <= 7) when accessing a share's
|
|
root dir which has EAs enabled? */
|
|
|| status == STATUS_INVALID_PARAMETER))
|
|
{
|
|
/* If EAs are not supported, there's no sense to check them again
|
|
with suffixes attached. So we set eabuf/easize to 0 here once. */
|
|
if (status == STATUS_EAS_NOT_SUPPORTED
|
|
|| status == STATUS_NOT_SUPPORTED)
|
|
{
|
|
eabuf = NULL;
|
|
easize = 0;
|
|
}
|
|
status = NtOpenFile (&h, READ_CONTROL | FILE_READ_ATTRIBUTES,
|
|
&attr, &io, FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_REPARSE_POINT
|
|
| FILE_OPEN_FOR_BACKUP_INTENT);
|
|
debug_printf ("%y = NtOpenFile (no-EAs %S)", status, &upath);
|
|
}
|
|
if (status == STATUS_OBJECT_NAME_NOT_FOUND)
|
|
{
|
|
/* There are filesystems out in the wild (Netapp, NWFS, and others)
|
|
which are uncapable of generating pathnames outside the Win32
|
|
rules. That means, filenames on these FSes must not have a
|
|
leading space or trailing dots and spaces. This code snippet
|
|
manages them. I really hope it's streamlined enough not to
|
|
slow down normal operation. This extra check only kicks in if
|
|
we encountered a STATUS_OBJECT_NAME_NOT_FOUND *and* we didn't
|
|
already attach a suffix. */
|
|
if (!restarted && !*ext_here && ext_here[-1] != '\\'
|
|
&& !(mount_flags & MOUNT_DOS))
|
|
{
|
|
/* Check for trailing dot or space or leading space in
|
|
last component. */
|
|
char *p = ext_here - 1;
|
|
if (*p != '.' && *p != ' ')
|
|
{
|
|
while (*--p != '\\')
|
|
assert(p >= path);
|
|
if (*++p != ' ')
|
|
p = NULL;
|
|
}
|
|
if (p)
|
|
{
|
|
/* If so, check if file resides on one of the known broken
|
|
FSes only supporting filenames following DOS rules. */
|
|
fs.update (&upath, NULL);
|
|
if (fs.has_dos_filenames_only ())
|
|
{
|
|
/* If so, try again. Since we now know the FS, the
|
|
filenames will be tweaked to follow DOS rules via the
|
|
third parameter in the call to get_nt_native_path. */
|
|
mount_flags |= MOUNT_DOS;
|
|
restarted = true;
|
|
goto restart;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (status == STATUS_NETWORK_OPEN_RESTRICTION
|
|
|| status == STATUS_SYMLINK_CLASS_DISABLED)
|
|
{
|
|
/* These status codes are returned if you try to open a native
|
|
symlink and the usage of this kind of symlink is forbidden
|
|
(see fsutil). Since we can't open them at all, not even for
|
|
stat purposes, we have to return a POSIX error code which is
|
|
at least a bit helpful.
|
|
|
|
Additionally Windows 8 introduces a bug in NFS: If you have
|
|
a symlink to a directory, with symlinks underneath, resolving
|
|
the second level of symlinks fails if remote->remote symlinks
|
|
are disabled in fsutil. Unfortunately that's the default. */
|
|
set_error (ELOOP);
|
|
break;
|
|
}
|
|
|
|
if (NT_SUCCESS (status)
|
|
/* Check file system while we're having the file open anyway.
|
|
This speeds up path_conv noticably (~10%). */
|
|
&& (fs.inited () || fs.update (&upath, h)))
|
|
{
|
|
status = conv_hdl.get_finfo (h, fs.is_nfs ());
|
|
if (NT_SUCCESS (status))
|
|
fileattr = conv_hdl.get_dosattr (fs.is_nfs ());
|
|
}
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("%y = NtQueryInformationFile (%S)", status, &upath);
|
|
fileattr = INVALID_FILE_ATTRIBUTES;
|
|
|
|
/* One of the inner path components is invalid, or the path contains
|
|
invalid characters. Bail out with ENOENT.
|
|
|
|
STATUS_IO_REPARSE_TAG_NOT_HANDLED is returned when trying to
|
|
traversing a WSL symlink. For all practical purposes it's
|
|
equivalent to traversing SYSTEM- or LNK-type symlink returning
|
|
STATUS_OBJECT_PATH_NOT_FOUND.
|
|
|
|
Note that additional STATUS_OBJECT_PATH_INVALID and
|
|
STATUS_OBJECT_PATH_SYNTAX_BAD status codes exist. The first one
|
|
is seemingly not generated by NtQueryInformationFile, the latter
|
|
is only generated if the path is no absolute path within the
|
|
NT name space, which should not happen and would point to an
|
|
error in get_nt_native_path. Both status codes are deliberately
|
|
not tested here unless proved necessary. */
|
|
if (status == STATUS_OBJECT_PATH_NOT_FOUND
|
|
|| status == STATUS_IO_REPARSE_TAG_NOT_HANDLED
|
|
|| status == STATUS_OBJECT_NAME_INVALID
|
|
|| status == STATUS_BAD_NETWORK_PATH
|
|
|| status == STATUS_BAD_NETWORK_NAME
|
|
|| status == STATUS_NO_MEDIA_IN_DEVICE)
|
|
{
|
|
set_error (ENOENT);
|
|
if (ext_tacked_on && !had_ext)
|
|
{
|
|
*ext_here = '\0';
|
|
ext_tacked_on = false;
|
|
ext_here = NULL;
|
|
extn = 0;
|
|
}
|
|
goto file_not_symlink;
|
|
}
|
|
if (status != STATUS_OBJECT_NAME_NOT_FOUND
|
|
&& status != STATUS_NO_SUCH_FILE) /* ENOENT on NFS or 9x share */
|
|
{
|
|
/* The file exists, but the user can't access it for one reason
|
|
or the other. To get the file attributes we try to access the
|
|
information by opening the parent directory and getting the
|
|
file attributes using a matching NtQueryDirectoryFile call. */
|
|
UNICODE_STRING dirname, basename;
|
|
OBJECT_ATTRIBUTES dattr;
|
|
HANDLE dir;
|
|
struct {
|
|
FILE_ID_BOTH_DIR_INFORMATION fdi;
|
|
WCHAR dummy_buf[NAME_MAX + 1];
|
|
} fdi_buf;
|
|
|
|
RtlSplitUnicodePath (&upath, &dirname, &basename);
|
|
InitializeObjectAttributes (&dattr, &dirname, ci_flag,
|
|
NULL, NULL);
|
|
status = NtOpenFile (&dir, SYNCHRONIZE | FILE_LIST_DIRECTORY,
|
|
&dattr, &io, FILE_SHARE_VALID_FLAGS,
|
|
FILE_SYNCHRONOUS_IO_NONALERT
|
|
| FILE_OPEN_FOR_BACKUP_INTENT
|
|
| FILE_DIRECTORY_FILE);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("%y = NtOpenFile(%S)", status, &dirname);
|
|
/* There's a special case if the file is itself the root
|
|
of a drive which is not accessible by the current user.
|
|
This case is only recognized by the length of the
|
|
basename part. If it's 0, the incoming file is the
|
|
root of a drive. So we at least know it's a directory. */
|
|
if (basename.Length)
|
|
fileattr = FILE_ATTRIBUTE_DIRECTORY;
|
|
else
|
|
{
|
|
fileattr = 0;
|
|
set_error (geterrno_from_nt_status (status));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
status = NtQueryDirectoryFile (dir, NULL, NULL, NULL, &io,
|
|
&fdi_buf, sizeof fdi_buf,
|
|
FileIdBothDirectoryInformation,
|
|
TRUE, &basename, TRUE);
|
|
/* Take the opportunity to check file system while we're
|
|
having the handle to the parent dir. */
|
|
fs.update (&upath, dir);
|
|
NtClose (dir);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("%y = NtQueryDirectoryFile(%S)",
|
|
status, &dirname);
|
|
if (status == STATUS_NO_SUCH_FILE)
|
|
{
|
|
/* This can happen when trying to access files
|
|
which match DOS device names on SMB shares.
|
|
NtOpenFile failed with STATUS_ACCESS_DENIED,
|
|
but the NtQueryDirectoryFile tells us the
|
|
file doesn't exist. We're suspicious in this
|
|
case and retry with the next suffix instead of
|
|
just giving up. */
|
|
set_error (ENOENT);
|
|
continue;
|
|
}
|
|
fileattr = 0;
|
|
}
|
|
else
|
|
{
|
|
PFILE_ALL_INFORMATION pfai = conv_hdl.fai ();
|
|
|
|
fileattr = fdi_buf.fdi.FileAttributes;
|
|
memcpy (&pfai->BasicInformation.CreationTime,
|
|
&fdi_buf.fdi.CreationTime,
|
|
4 * sizeof (LARGE_INTEGER));
|
|
pfai->BasicInformation.FileAttributes = fileattr;
|
|
pfai->StandardInformation.AllocationSize.QuadPart
|
|
= fdi_buf.fdi.AllocationSize.QuadPart;
|
|
pfai->StandardInformation.EndOfFile.QuadPart
|
|
= fdi_buf.fdi.EndOfFile.QuadPart;
|
|
pfai->StandardInformation.NumberOfLinks = 1;
|
|
pfai->InternalInformation.IndexNumber.QuadPart
|
|
= fdi_buf.fdi.FileId.QuadPart;
|
|
}
|
|
}
|
|
ext_tacked_on = !!*ext_here;
|
|
goto file_not_symlink;
|
|
}
|
|
set_error (ENOENT);
|
|
continue;
|
|
}
|
|
|
|
ext_tacked_on = !!*ext_here;
|
|
/* Don't allow to returns directories with appended suffix. If we found
|
|
a directory with a suffix which has been appended here, then this
|
|
directory doesn't match the request. So, just do as usual if file
|
|
hasn't been found. */
|
|
if (ext_tacked_on && !had_ext && (fileattr & FILE_ATTRIBUTE_DIRECTORY))
|
|
{
|
|
fileattr = INVALID_FILE_ATTRIBUTES;
|
|
set_error (ENOENT);
|
|
continue;
|
|
}
|
|
|
|
res = -1;
|
|
|
|
/* Reparse points are potentially symlinks. This check must be
|
|
performed before checking the SYSTEM attribute for sysfile
|
|
symlinks, since reparse points can have this flag set, too. */
|
|
if ((fileattr & FILE_ATTRIBUTE_REPARSE_POINT))
|
|
{
|
|
res = check_reparse_point (h, fs.is_remote_drive ());
|
|
if (res > 0)
|
|
{
|
|
/* A symlink is never a directory. */
|
|
conv_hdl.fai ()->BasicInformation.FileAttributes
|
|
&= ~FILE_ATTRIBUTE_DIRECTORY;
|
|
break;
|
|
}
|
|
else if (res == 0 && (path_flags & PATH_REP))
|
|
/* Known reparse point but not a symlink. */
|
|
goto file_not_symlink;
|
|
else
|
|
{
|
|
/* Volume moint point or unrecognized reparse point type.
|
|
Make sure the open handle is not used in later stat calls.
|
|
The handle has been opened with the FILE_OPEN_REPARSE_POINT
|
|
flag, so it's a handle to the reparse point, not a handle
|
|
to the volumes root dir. */
|
|
pc_flags &= ~PC_KEEP_HANDLE;
|
|
/* Volume mount point: The filesystem information for the top
|
|
level directory should be for the volume top level directory,
|
|
rather than for the reparse point itself. So we fetch the
|
|
filesystem information again, but with a NULL handle.
|
|
This does what we want because fs_info::update opens the
|
|
handle without FILE_OPEN_REPARSE_POINT. */
|
|
if (res < 0)
|
|
fs.update (&upath, NULL);
|
|
}
|
|
}
|
|
|
|
/* Windows shortcuts are potentially treated as symlinks. Valid Cygwin
|
|
& U/WIN shortcuts are R/O, but definitely not directories. */
|
|
else if ((fileattr & (FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_DIRECTORY))
|
|
== FILE_ATTRIBUTE_READONLY && suffix.lnk_match ())
|
|
{
|
|
HANDLE sym_h;
|
|
|
|
status = NtOpenFile (&sym_h, SYNCHRONIZE | GENERIC_READ, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT
|
|
| FILE_SYNCHRONOUS_IO_NONALERT);
|
|
if (!NT_SUCCESS (status))
|
|
res = 0;
|
|
else
|
|
{
|
|
res = check_shortcut (sym_h);
|
|
NtClose (sym_h);
|
|
}
|
|
if (!res)
|
|
{
|
|
/* If searching for `foo' and then finding a `foo.lnk' which
|
|
is no shortcut, return the same as if file not found. */
|
|
if (ext_tacked_on)
|
|
{
|
|
fileattr = INVALID_FILE_ATTRIBUTES;
|
|
set_error (ENOENT);
|
|
continue;
|
|
}
|
|
}
|
|
else if (contents[0] != ':' || contents[1] != '\\'
|
|
|| !parse_device (contents))
|
|
break;
|
|
}
|
|
|
|
/* If searching for `foo' and then finding a `foo.lnk' which is
|
|
no shortcut, return the same as if file not found. */
|
|
else if (suffix.lnk_match () && ext_tacked_on)
|
|
{
|
|
fileattr = INVALID_FILE_ATTRIBUTES;
|
|
set_error (ENOENT);
|
|
continue;
|
|
}
|
|
|
|
/* This is the old Cygwin method creating symlinks. A symlink will
|
|
have the `system' file attribute. Only files can be symlinks
|
|
(which can be symlinks to directories). */
|
|
else if ((fileattr & (FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_DIRECTORY))
|
|
== FILE_ATTRIBUTE_SYSTEM)
|
|
{
|
|
HANDLE sym_h;
|
|
|
|
status = NtOpenFile (&sym_h, SYNCHRONIZE | GENERIC_READ, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT
|
|
| FILE_SYNCHRONOUS_IO_NONALERT);
|
|
|
|
if (!NT_SUCCESS (status))
|
|
res = 0;
|
|
else
|
|
{
|
|
res = check_sysfile (sym_h);
|
|
NtClose (sym_h);
|
|
}
|
|
if (res)
|
|
break;
|
|
}
|
|
|
|
/* If the file is on an NFS share and could be opened with extended
|
|
attributes, check if it's a symlink. Only files can be symlinks
|
|
(which can be symlinks to directories). */
|
|
else if (fs.is_nfs () && (conv_hdl.nfsattr ()->type & 7) == NF3LNK)
|
|
{
|
|
res = check_nfs_symlink (h);
|
|
if (res)
|
|
break;
|
|
}
|
|
|
|
/* Check if the inner path components contain native symlinks or
|
|
junctions, or if the drive is a virtual drive. Compare incoming
|
|
path with path returned by GetFinalPathNameByHandleA. If they
|
|
differ, return the final path as symlink content and set symlen
|
|
to a negative value. This forces path_conv::check to restart
|
|
symlink evaluation with the new path. */
|
|
if ((pc_flags & (PC_SYM_FOLLOW | PC_SYM_NOFOLLOW_REP)) == PC_SYM_FOLLOW)
|
|
{
|
|
PWCHAR fpbuf = tp.w_get ();
|
|
DWORD ret;
|
|
|
|
ret = GetFinalPathNameByHandleW (h, fpbuf, NT_MAX_PATH, 0);
|
|
if (ret)
|
|
{
|
|
UNICODE_STRING fpath;
|
|
|
|
/* If incoming path has no trailing backslash, but final path
|
|
has one, drop trailing backslash from final path so the
|
|
below string comparison has a chance to succeed.
|
|
On the contrary, if incoming path has trailing backslash,
|
|
but final path does not have one, add trailing backslash
|
|
to the final path. */
|
|
if (upath.Buffer[(upath.Length - 1) / sizeof (WCHAR)] != L'\\'
|
|
&& fpbuf[ret - 1] == L'\\')
|
|
fpbuf[--ret] = L'\0';
|
|
if (upath.Buffer[(upath.Length - 1) / sizeof (WCHAR)] == L'\\'
|
|
&& fpbuf[ret - 1] != L'\\' && ret < NT_MAX_PATH - 1)
|
|
{
|
|
fpbuf[ret++] = L'\\';
|
|
fpbuf[ret] = L'\0';
|
|
}
|
|
fpbuf[1] = L'?'; /* \\?\ --> \??\ */
|
|
RtlInitCountedUnicodeString (&fpath, fpbuf, ret * sizeof (WCHAR));
|
|
if (!RtlEqualUnicodeString (&upath, &fpath, !!ci_flag))
|
|
{
|
|
/* Check if the final path is an UNC path and the incoming
|
|
path isn't. If so... */
|
|
if (RtlEqualUnicodePathPrefix (&fpath, &ro_u_uncp, TRUE)
|
|
&& !RtlEqualUnicodePathPrefix (&upath, &ro_u_uncp, TRUE))
|
|
{
|
|
/* ...get the remote path, replace remote path
|
|
with drive letter, check again. */
|
|
WCHAR drive[3] =
|
|
{(WCHAR) towupper (upath.Buffer[4]), L':', L'\0'};
|
|
WCHAR remote[MAX_PATH];
|
|
|
|
DWORD remlen = QueryDosDeviceW (drive, remote, MAX_PATH);
|
|
if (remlen < 3)
|
|
goto file_not_symlink; /* fallback */
|
|
remlen -= 2; /* Two L'\0' */
|
|
|
|
if (remote[remlen - 1] == L'\\')
|
|
remlen--;
|
|
WCHAR *p;
|
|
UNICODE_STRING rpath;
|
|
RtlInitCountedUnicodeString (&rpath, remote,
|
|
remlen * sizeof (WCHAR));
|
|
const USHORT uncp_len =
|
|
ro_u_uncp.Length / sizeof (WCHAR) - 1;
|
|
if (RtlEqualUnicodePathPrefix (&rpath, &ro_u_uncp, TRUE))
|
|
{
|
|
remlen -= uncp_len;
|
|
p = remote + uncp_len;
|
|
}
|
|
else if ((p = wcschr (remote, L';'))
|
|
&& p + 3 < remote + remlen
|
|
&& wcsncmp (p + 1, drive, 2) == 0
|
|
&& (p = wcschr (p + 3, L'\\')))
|
|
remlen -= p - remote;
|
|
else
|
|
goto file_not_symlink; /* fallback */
|
|
if (wcsncasecmp (fpath.Buffer + uncp_len, p, remlen))
|
|
goto file_not_symlink; /* fallback (not expected) */
|
|
/* Hackfest */
|
|
fpath.Buffer[4] = drive[0]; /* Drive letter */
|
|
fpath.Buffer[5] = L':';
|
|
WCHAR *to = fpath.Buffer + 6; /* Next to L':' */
|
|
WCHAR *from = fpath.Buffer + uncp_len + remlen;
|
|
memmove (to, from,
|
|
(wcslen (from) + 1) * sizeof (WCHAR));
|
|
fpath.Length -= (from - to) * sizeof (WCHAR);
|
|
if (RtlEqualUnicodeString (&upath, &fpath, !!ci_flag))
|
|
goto file_not_symlink;
|
|
}
|
|
issymlink = true;
|
|
/* upath.Buffer is big enough and unused from this point on.
|
|
Reuse it here, avoiding yet another buffer allocation. */
|
|
char *nfpath = (char *) upath.Buffer;
|
|
sys_wcstombs (nfpath, NT_MAX_PATH, fpbuf);
|
|
res = posixify (nfpath);
|
|
|
|
/* If the incoming path consisted of a drive prefix only,
|
|
we just handle a virtual drive, created with, e.g.
|
|
|
|
subst X: C:\foo\bar
|
|
|
|
Treat it like a symlink. This is required to tell an
|
|
lstat caller that the "drive" is actually pointing
|
|
somewhere else, thus, it's a symlink in POSIX speak. */
|
|
if (upath.Length == 14) /* \??\X:\ */
|
|
{
|
|
fileattr &= ~FILE_ATTRIBUTE_DIRECTORY;
|
|
path_flags |= PATH_SYMLINK;
|
|
}
|
|
/* For final paths differing in inner path components return
|
|
length as negative value. This informs path_conv::check
|
|
to skip realpath handling on the last path component. */
|
|
else
|
|
res = -res;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Normal file. */
|
|
file_not_symlink:
|
|
issymlink = false;
|
|
syscall_printf ("%s", isdevice ? "is a device" : "not a symlink");
|
|
res = 0;
|
|
break;
|
|
}
|
|
|
|
if (h)
|
|
{
|
|
if (pc_flags & PC_KEEP_HANDLE)
|
|
conv_hdl.set (h);
|
|
else
|
|
NtClose (h);
|
|
}
|
|
|
|
syscall_printf ("%d = symlink.check(%s, %p) (mount_flags %y, path_flags %y)",
|
|
res, suffix.path, contents, mount_flags, path_flags);
|
|
return res;
|
|
}
|
|
|
|
/* "path" is the path in a virtual symlink. Set a symlink_info struct from
|
|
that and proceed with further path checking afterwards. */
|
|
int
|
|
symlink_info::set (char *path)
|
|
{
|
|
strcpy (contents, path);
|
|
mount_flags = 0;
|
|
path_flags = PATH_SYMLINK;
|
|
fileattr = FILE_ATTRIBUTE_NORMAL;
|
|
error = 0;
|
|
issymlink = true;
|
|
isdevice = false;
|
|
ext_tacked_on = false;
|
|
ext_here = NULL;
|
|
extn = major = minor = mode = 0;
|
|
return strlen (path);
|
|
}
|
|
|
|
/* readlink system call */
|
|
|
|
extern "C" ssize_t
|
|
readlink (const char *__restrict path, char *__restrict buf, size_t buflen)
|
|
{
|
|
if (buflen < 0)
|
|
{
|
|
set_errno (ENAMETOOLONG);
|
|
return -1;
|
|
}
|
|
|
|
path_conv pathbuf (path, PC_SYM_CONTENTS, stat_suffixes);
|
|
|
|
if (pathbuf.error)
|
|
{
|
|
set_errno (pathbuf.error);
|
|
syscall_printf ("-1 = readlink (%s, %p, %lu)", path, buf, buflen);
|
|
return -1;
|
|
}
|
|
|
|
if (!pathbuf.exists ())
|
|
{
|
|
set_errno (ENOENT);
|
|
return -1;
|
|
}
|
|
|
|
if (!pathbuf.issymlink ())
|
|
{
|
|
if (pathbuf.exists ())
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
size_t pathbuf_len = strlen (pathbuf.get_win32 ());
|
|
ssize_t len = MIN (buflen, pathbuf_len);
|
|
memcpy (buf, pathbuf.get_win32 (), len);
|
|
|
|
/* errno set by symlink.check if error */
|
|
return len;
|
|
}
|
|
|
|
/* Some programs rely on st_dev/st_ino being unique for each file.
|
|
Hash the path name and hope for the best. The hash arg is not
|
|
always initialized to zero since readdir needs to compute the
|
|
dirent ino_t based on a combination of the hash of the directory
|
|
done during the opendir call and the hash or the filename within
|
|
the directory. FIXME: Not bullet-proof. */
|
|
/* Cygwin internal */
|
|
ino_t __reg2
|
|
hash_path_name (ino_t hash, PUNICODE_STRING name)
|
|
{
|
|
if (name->Length == 0)
|
|
return hash;
|
|
|
|
/* Build up hash. Name is already normalized */
|
|
USHORT len = name->Length / sizeof (WCHAR);
|
|
for (USHORT idx = 0; idx < len; ++idx)
|
|
hash = RtlUpcaseUnicodeChar (name->Buffer[idx])
|
|
+ (hash << 6) + (hash << 16) - hash;
|
|
return hash;
|
|
}
|
|
|
|
ino_t __reg2
|
|
hash_path_name (ino_t hash, PCWSTR name)
|
|
{
|
|
UNICODE_STRING uname;
|
|
RtlInitUnicodeString (&uname, name);
|
|
return hash_path_name (hash, &uname);
|
|
}
|
|
|
|
ino_t __reg2
|
|
hash_path_name (ino_t hash, const char *name)
|
|
{
|
|
UNICODE_STRING uname;
|
|
RtlCreateUnicodeStringFromAsciiz (&uname, name);
|
|
ino_t ret = hash_path_name (hash, &uname);
|
|
RtlFreeUnicodeString (&uname);
|
|
return ret;
|
|
}
|
|
|
|
extern "C" char *
|
|
getcwd (char *buf, size_t ulen)
|
|
{
|
|
char* res = NULL;
|
|
|
|
__try
|
|
{
|
|
if (ulen == 0 && buf)
|
|
set_errno (EINVAL);
|
|
else
|
|
res = cygheap->cwd.get (buf, 1, 1, ulen);
|
|
}
|
|
__except (EFAULT) {}
|
|
__endtry
|
|
return res;
|
|
}
|
|
|
|
/* getwd: Legacy. */
|
|
extern "C" char *
|
|
getwd (char *buf)
|
|
{
|
|
return getcwd (buf, PATH_MAX + 1); /*Per SuSv3!*/
|
|
}
|
|
|
|
extern "C" char *
|
|
get_current_dir_name (void)
|
|
{
|
|
const char *pwd = getenv ("PWD");
|
|
char *cwd = getcwd (NULL, 0);
|
|
struct stat pwdbuf, cwdbuf;
|
|
|
|
if (pwd && strcmp (pwd, cwd) != 0
|
|
&& stat64 (pwd, &pwdbuf) == 0
|
|
&& stat64 (cwd, &cwdbuf) == 0
|
|
&& pwdbuf.st_dev == cwdbuf.st_dev
|
|
&& pwdbuf.st_ino == cwdbuf.st_ino)
|
|
{
|
|
cwd = (char *) realloc (cwd, strlen (pwd) + 1);
|
|
strcpy (cwd, pwd);
|
|
}
|
|
|
|
return cwd;
|
|
}
|
|
|
|
/* chdir: POSIX 5.2.1.1 */
|
|
extern "C" int
|
|
chdir (const char *in_dir)
|
|
{
|
|
int res = -1;
|
|
|
|
__try
|
|
{
|
|
if (!*in_dir)
|
|
{
|
|
set_errno (ENOENT);
|
|
__leave;
|
|
}
|
|
|
|
syscall_printf ("dir '%s'", in_dir);
|
|
|
|
/* Convert path. PC_NONULLEMPTY ensures that we don't check for
|
|
NULL/empty/invalid again. */
|
|
path_conv path (in_dir, PC_SYM_FOLLOW | PC_POSIX | PC_NONULLEMPTY);
|
|
if (path.error)
|
|
{
|
|
set_errno (path.error);
|
|
syscall_printf ("-1 = chdir (%s)", in_dir);
|
|
__leave;
|
|
}
|
|
|
|
const char *posix_cwd = NULL;
|
|
dev_t devn = path.get_device ();
|
|
if (!path.exists ())
|
|
set_errno (ENOENT);
|
|
else if (!path.isdir ())
|
|
set_errno (ENOTDIR);
|
|
else if (!isvirtual_dev (devn))
|
|
{
|
|
/* The sequence chdir("xx"); chdir(".."); must be a noop if xx
|
|
is not a symlink. This is exploited by find.exe.
|
|
The posix_cwd is just path.get_posix ().
|
|
In other cases we let cwd.set obtain the Posix path through
|
|
the mount table. */
|
|
if (!isdrive (path.get_posix ()))
|
|
posix_cwd = path.get_posix ();
|
|
res = 0;
|
|
}
|
|
else
|
|
{
|
|
posix_cwd = path.get_posix ();
|
|
res = 0;
|
|
}
|
|
|
|
if (!res)
|
|
res = cygheap->cwd.set (&path, posix_cwd);
|
|
|
|
/* Note that we're accessing cwd.posix without a lock here.
|
|
I didn't think it was worth locking just for strace. */
|
|
syscall_printf ("%R = chdir() cygheap->cwd.posix '%s' native '%S'", res,
|
|
cygheap->cwd.get_posix (), path.get_nt_native_path ());
|
|
}
|
|
__except (EFAULT)
|
|
{
|
|
res = -1;
|
|
}
|
|
__endtry
|
|
return res;
|
|
}
|
|
|
|
extern "C" int
|
|
fchdir (int fd)
|
|
{
|
|
int res;
|
|
cygheap_fdget cfd (fd);
|
|
if (cfd >= 0)
|
|
res = chdir (cfd->get_name ());
|
|
else
|
|
res = -1;
|
|
|
|
syscall_printf ("%R = fchdir(%d)", res, fd);
|
|
return res;
|
|
}
|
|
|
|
/******************** Exported Path Routines *********************/
|
|
|
|
/* Cover functions to the path conversion routines.
|
|
These are exported to the world as cygwin_foo by cygwin.din. */
|
|
|
|
#define return_with_errno(x) \
|
|
do {\
|
|
int err = (x);\
|
|
if (!err)\
|
|
return 0;\
|
|
set_errno (err);\
|
|
return -1;\
|
|
} while (0)
|
|
|
|
extern "C" ssize_t
|
|
cygwin_conv_path (cygwin_conv_path_t what, const void *from, void *to,
|
|
size_t size)
|
|
{
|
|
tmp_pathbuf tp;
|
|
path_conv p;
|
|
size_t lsiz = 0;
|
|
char *buf = NULL;
|
|
PWCHAR path = NULL;
|
|
int error = 0;
|
|
int how = what & CCP_CONVFLAGS_MASK;
|
|
what &= CCP_CONVTYPE_MASK;
|
|
int ret = -1;
|
|
|
|
__try
|
|
{
|
|
if (!from)
|
|
{
|
|
set_errno (EINVAL);
|
|
__leave;
|
|
}
|
|
|
|
switch (what)
|
|
{
|
|
case CCP_POSIX_TO_WIN_A:
|
|
{
|
|
p.check ((const char *) from,
|
|
PC_POSIX | PC_SYM_FOLLOW | PC_SYM_NOFOLLOW_REP
|
|
| PC_NO_ACCESS_CHECK
|
|
| ((how & CCP_RELATIVE) ? PC_NOFULL : 0), stat_suffixes);
|
|
if (p.error)
|
|
{
|
|
set_errno (p.error);
|
|
__leave;
|
|
}
|
|
PUNICODE_STRING up = p.get_nt_native_path ();
|
|
buf = tp.c_get ();
|
|
sys_wcstombs (buf, NT_MAX_PATH,
|
|
up->Buffer, up->Length / sizeof (WCHAR));
|
|
/* Convert native path to standard DOS path. */
|
|
if (!strncmp (buf, "\\??\\", 4))
|
|
{
|
|
buf += 4;
|
|
if (buf[1] != ':') /* native UNC path */
|
|
*(buf += 2) = '\\';
|
|
}
|
|
else if (*buf == '\\')
|
|
{
|
|
/* Device name points to somewhere else in the NT namespace.
|
|
Use GLOBALROOT prefix to convert to Win32 path. */
|
|
char *p = buf + sys_wcstombs (buf, NT_MAX_PATH,
|
|
ro_u_globalroot.Buffer,
|
|
ro_u_globalroot.Length
|
|
/ sizeof (WCHAR));
|
|
sys_wcstombs (p, NT_MAX_PATH - (p - buf),
|
|
up->Buffer, up->Length / sizeof (WCHAR));
|
|
}
|
|
lsiz = strlen (buf) + 1;
|
|
/* TODO: Incoming "." is a special case which leads to a trailing
|
|
backslash ".\\" in the Win32 path. That's a result of the
|
|
conversion in normalize_posix_path. This should not occur
|
|
so the below code is just a band-aid. */
|
|
if ((how & CCP_RELATIVE) && !strcmp ((const char *) from, ".")
|
|
&& !strcmp (buf, ".\\"))
|
|
{
|
|
lsiz = 2;
|
|
buf[1] = '\0';
|
|
}
|
|
}
|
|
break;
|
|
case CCP_POSIX_TO_WIN_W:
|
|
p.check ((const char *) from,
|
|
PC_POSIX | PC_SYM_FOLLOW | PC_SYM_NOFOLLOW_REP
|
|
| PC_NO_ACCESS_CHECK
|
|
| ((how & CCP_RELATIVE) ? PC_NOFULL : 0), stat_suffixes);
|
|
if (p.error)
|
|
{
|
|
set_errno (p.error);
|
|
__leave;
|
|
}
|
|
/* Relative Windows paths are always restricted to MAX_PATH chars. */
|
|
if ((how & CCP_RELATIVE) && !isabspath (p.get_win32 ())
|
|
&& sys_mbstowcs (NULL, 0, p.get_win32 ()) > MAX_PATH)
|
|
{
|
|
/* Recreate as absolute path. */
|
|
p.check ((const char *) from, PC_POSIX | PC_SYM_FOLLOW
|
|
| PC_NO_ACCESS_CHECK);
|
|
if (p.error)
|
|
{
|
|
set_errno (p.error);
|
|
__leave;
|
|
}
|
|
}
|
|
lsiz = p.get_wide_win32_path_len () + 1;
|
|
path = p.get_nt_native_path ()->Buffer;
|
|
|
|
/* Convert native path to standard DOS path. */
|
|
if (!wcsncmp (path, L"\\??\\", 4))
|
|
{
|
|
path[1] = L'\\';
|
|
|
|
/* Drop long path prefix for short pathnames. Unfortunately there's
|
|
quite a bunch of Win32 functions, especially in user32.dll,
|
|
apparently, which don't grok long path names at all, not even
|
|
in the UNICODE API. */
|
|
if ((path[5] == L':' && lsiz <= MAX_PATH + 4)
|
|
|| (!wcsncmp (path + 4, L"UNC\\", 4) && lsiz <= MAX_PATH + 6))
|
|
{
|
|
path += 4;
|
|
lsiz -= 4;
|
|
if (path[1] != L':')
|
|
{
|
|
*(path += 2) = '\\';
|
|
lsiz -= 2;
|
|
}
|
|
}
|
|
}
|
|
else if (*path == L'\\')
|
|
{
|
|
/* Device name points to somewhere else in the NT namespace.
|
|
Use GLOBALROOT prefix to convert to Win32 path. */
|
|
to = (void *) wcpcpy ((wchar_t *) to, ro_u_globalroot.Buffer);
|
|
lsiz += ro_u_globalroot.Length / sizeof (WCHAR);
|
|
}
|
|
/* TODO: Same ".\\" band-aid as in CCP_POSIX_TO_WIN_A case. */
|
|
if ((how & CCP_RELATIVE) && !strcmp ((const char *) from, ".")
|
|
&& !wcscmp (path, L".\\"))
|
|
{
|
|
lsiz = 2;
|
|
path[1] = L'\0';
|
|
}
|
|
lsiz *= sizeof (WCHAR);
|
|
break;
|
|
case CCP_WIN_A_TO_POSIX:
|
|
buf = tp.c_get ();
|
|
error = mount_table->conv_to_posix_path ((const char *) from, buf,
|
|
how | __CCP_APP_SLASH);
|
|
if (error)
|
|
{
|
|
set_errno (p.error);
|
|
__leave;
|
|
}
|
|
lsiz = strlen (buf) + 1;
|
|
break;
|
|
case CCP_WIN_W_TO_POSIX:
|
|
buf = tp.c_get ();
|
|
error = mount_table->conv_to_posix_path ((const PWCHAR) from, buf,
|
|
how | __CCP_APP_SLASH);
|
|
if (error)
|
|
{
|
|
set_errno (error);
|
|
__leave;
|
|
}
|
|
lsiz = strlen (buf) + 1;
|
|
break;
|
|
default:
|
|
set_errno (EINVAL);
|
|
__leave;
|
|
}
|
|
if (!size)
|
|
{
|
|
ret = lsiz;
|
|
__leave;
|
|
}
|
|
if (size < lsiz)
|
|
{
|
|
set_errno (ENOSPC);
|
|
__leave;
|
|
}
|
|
switch (what)
|
|
{
|
|
case CCP_POSIX_TO_WIN_A:
|
|
case CCP_WIN_A_TO_POSIX:
|
|
case CCP_WIN_W_TO_POSIX:
|
|
stpcpy ((char *) to, buf);
|
|
break;
|
|
case CCP_POSIX_TO_WIN_W:
|
|
wcpcpy ((PWCHAR) to, path);
|
|
break;
|
|
}
|
|
ret = 0;
|
|
}
|
|
__except (EFAULT) {}
|
|
__endtry
|
|
return ret;
|
|
}
|
|
|
|
extern "C" void *
|
|
cygwin_create_path (cygwin_conv_path_t what, const void *from)
|
|
{
|
|
void *to;
|
|
ssize_t size = cygwin_conv_path (what, from, NULL, 0);
|
|
if (size <= 0)
|
|
to = NULL;
|
|
else if (!(to = malloc (size)))
|
|
to = NULL;
|
|
if (cygwin_conv_path (what, from, to, size) == -1)
|
|
{
|
|
free (to);
|
|
to = NULL;
|
|
}
|
|
return to;
|
|
}
|
|
|
|
#ifdef __i386__
|
|
|
|
extern "C" int
|
|
cygwin_conv_to_win32_path (const char *path, char *win32_path)
|
|
{
|
|
return cygwin_conv_path (CCP_POSIX_TO_WIN_A | CCP_RELATIVE, path, win32_path,
|
|
MAX_PATH);
|
|
}
|
|
|
|
extern "C" int
|
|
cygwin_conv_to_full_win32_path (const char *path, char *win32_path)
|
|
{
|
|
return cygwin_conv_path (CCP_POSIX_TO_WIN_A | CCP_ABSOLUTE, path, win32_path,
|
|
MAX_PATH);
|
|
}
|
|
|
|
/* This is exported to the world as cygwin_foo by cygwin.din. */
|
|
|
|
extern "C" int
|
|
cygwin_conv_to_posix_path (const char *path, char *posix_path)
|
|
{
|
|
return cygwin_conv_path (CCP_WIN_A_TO_POSIX | CCP_RELATIVE, path, posix_path,
|
|
MAX_PATH);
|
|
}
|
|
|
|
extern "C" int
|
|
cygwin_conv_to_full_posix_path (const char *path, char *posix_path)
|
|
{
|
|
return cygwin_conv_path (CCP_WIN_A_TO_POSIX | CCP_ABSOLUTE, path, posix_path,
|
|
MAX_PATH);
|
|
}
|
|
|
|
#endif /* __i386__ */
|
|
|
|
/* The realpath function is required by POSIX:2008. */
|
|
|
|
extern "C" char *
|
|
realpath (const char *__restrict path, char *__restrict resolved)
|
|
{
|
|
tmp_pathbuf tp;
|
|
char *tpath;
|
|
|
|
/* Make sure the right errno is returned if path is NULL. */
|
|
if (!path)
|
|
{
|
|
set_errno (EINVAL);
|
|
return NULL;
|
|
}
|
|
|
|
/* Guard reading from a potentially invalid path and writing to a
|
|
potentially invalid resolved. */
|
|
__try
|
|
{
|
|
/* Win32 drive letter paths and, generally, any path starting with a
|
|
backslash, have to be converted to a POSIX path first, because
|
|
path_conv leaves the incoming path untouched except for converting
|
|
backslashes to forward slashes. This also covers '\\?\ and '\??\'
|
|
path prefixes. */
|
|
if (isdrive (path) || path[0] == '\\')
|
|
{
|
|
tpath = tp.c_get ();
|
|
mount_table->conv_to_posix_path (path, tpath, 0);
|
|
}
|
|
else
|
|
tpath = (char *) path;
|
|
|
|
path_conv real_path (tpath, PC_SYM_FOLLOW | PC_POSIX, stat_suffixes);
|
|
|
|
|
|
/* POSIX 2008 requires malloc'ing if resolved is NULL, and states
|
|
that using non-NULL resolved is asking for portability
|
|
problems. */
|
|
|
|
if (!real_path.error && real_path.exists ())
|
|
{
|
|
if (!resolved)
|
|
{
|
|
resolved = (char *)
|
|
malloc (strlen (real_path.get_posix ()) + 1);
|
|
if (!resolved)
|
|
return NULL;
|
|
}
|
|
strcpy (resolved, real_path.get_posix ());
|
|
return resolved;
|
|
}
|
|
|
|
/* FIXME: on error, Linux puts the name of the path
|
|
component which could not be resolved into RESOLVED, but POSIX
|
|
does not require this. */
|
|
if (resolved)
|
|
resolved[0] = '\0';
|
|
set_errno (real_path.error ?: ENOENT);
|
|
}
|
|
__except (EFAULT) {}
|
|
__endtry
|
|
return NULL;
|
|
}
|
|
|
|
/* Linux provides this extension. Since the only portable use of
|
|
realpath requires a NULL second argument, we might as well have a
|
|
one-argument wrapper. */
|
|
extern "C" char *
|
|
canonicalize_file_name (const char *path)
|
|
{
|
|
return realpath (path, NULL);
|
|
}
|
|
|
|
/* Return non-zero if path is a POSIX path list.
|
|
This is exported to the world as cygwin_foo by cygwin.din.
|
|
|
|
DOCTOOL-START
|
|
<sect1 id="add-func-cygwin-posix-path-list-p">
|
|
<para>Rather than use a mode to say what the "proper" path list
|
|
format is, we allow any, and give apps the tools they need to
|
|
convert between the two. If a ';' is present in the path list it's
|
|
a Win32 path list. Otherwise, if the first path begins with
|
|
[letter]: (in which case it can be the only element since if it
|
|
wasn't a ';' would be present) it's a Win32 path list. Otherwise,
|
|
it's a POSIX path list.</para>
|
|
</sect1>
|
|
DOCTOOL-END
|
|
*/
|
|
|
|
extern "C" int
|
|
cygwin_posix_path_list_p (const char *path)
|
|
{
|
|
int posix_p = !(strchr (path, ';') || isdrive (path));
|
|
return posix_p;
|
|
}
|
|
|
|
/* These are used for apps that need to convert env vars like PATH back and
|
|
forth. The conversion is a two step process. First, an upper bound on the
|
|
size of the buffer needed is computed. Then the conversion is done. This
|
|
allows the caller to use alloca if it wants. */
|
|
|
|
static int
|
|
conv_path_list_buf_size (const char *path_list, bool to_posix)
|
|
{
|
|
int i, num_elms, max_mount_path_len, size;
|
|
const char *p;
|
|
|
|
path_conv pc(".", PC_POSIX);
|
|
/* The theory is that an upper bound is
|
|
current_size + (num_elms * max_mount_path_len) */
|
|
/* FIXME: This method is questionable in the long run. */
|
|
|
|
unsigned nrel;
|
|
char delim = to_posix ? ';' : ':';
|
|
for (p = path_list, num_elms = nrel = 0; p; num_elms++)
|
|
{
|
|
if (!isabspath (p))
|
|
nrel++;
|
|
p = strchr (++p, delim);
|
|
}
|
|
|
|
/* 7: strlen ("//c") + slop, a conservative initial value */
|
|
for (max_mount_path_len = sizeof ("/cygdrive/X"), i = 0;
|
|
i < mount_table->nmounts; i++)
|
|
{
|
|
int mount_len = (to_posix
|
|
? mount_table->mount[i].posix_pathlen
|
|
: mount_table->mount[i].native_pathlen);
|
|
if (max_mount_path_len < mount_len)
|
|
max_mount_path_len = mount_len;
|
|
}
|
|
|
|
/* 100: slop */
|
|
size = strlen (path_list)
|
|
+ (num_elms * max_mount_path_len)
|
|
+ (nrel * strlen (to_posix ? pc.get_posix () : pc.get_win32 ()))
|
|
+ 100;
|
|
|
|
return size;
|
|
}
|
|
|
|
extern "C" ssize_t
|
|
env_PATH_to_posix (const void *win32, void *posix, size_t size)
|
|
{
|
|
return_with_errno (conv_path_list ((const char *) win32, (char *) posix,
|
|
size, ENV_CVT));
|
|
}
|
|
|
|
#ifdef __i386__
|
|
|
|
extern "C" int
|
|
cygwin_win32_to_posix_path_list_buf_size (const char *path_list)
|
|
{
|
|
return conv_path_list_buf_size (path_list, true);
|
|
}
|
|
|
|
extern "C" int
|
|
cygwin_posix_to_win32_path_list_buf_size (const char *path_list)
|
|
{
|
|
return conv_path_list_buf_size (path_list, false);
|
|
}
|
|
|
|
extern "C" int
|
|
cygwin_win32_to_posix_path_list (const char *win32, char *posix)
|
|
{
|
|
return_with_errno (conv_path_list (win32, posix, MAX_PATH,
|
|
CCP_WIN_A_TO_POSIX | CCP_RELATIVE));
|
|
}
|
|
|
|
extern "C" int
|
|
cygwin_posix_to_win32_path_list (const char *posix, char *win32)
|
|
{
|
|
return_with_errno (conv_path_list (posix, win32, MAX_PATH,
|
|
CCP_POSIX_TO_WIN_A | CCP_RELATIVE));
|
|
}
|
|
|
|
#endif /* __i386__ */
|
|
|
|
extern "C" ssize_t
|
|
cygwin_conv_path_list (cygwin_conv_path_t what, const void *from, void *to,
|
|
size_t size)
|
|
{
|
|
int ret;
|
|
char *winp = NULL;
|
|
void *orig_to = NULL;
|
|
tmp_pathbuf tp;
|
|
|
|
switch (what & CCP_CONVTYPE_MASK)
|
|
{
|
|
case CCP_WIN_W_TO_POSIX:
|
|
if (!sys_wcstombs_alloc (&winp, HEAP_NOTHEAP, (const wchar_t *) from,
|
|
(size_t) -1))
|
|
return -1;
|
|
what = (what & ~CCP_CONVTYPE_MASK) | CCP_WIN_A_TO_POSIX;
|
|
from = (const void *) winp;
|
|
break;
|
|
case CCP_POSIX_TO_WIN_W:
|
|
if (size == 0)
|
|
return conv_path_list_buf_size ((const char *) from, 0)
|
|
* sizeof (WCHAR);
|
|
what = (what & ~CCP_CONVTYPE_MASK) | CCP_POSIX_TO_WIN_A;
|
|
orig_to = to;
|
|
to = (void *) tp.w_get ();
|
|
size = 65536;
|
|
break;
|
|
}
|
|
switch (what & CCP_CONVTYPE_MASK)
|
|
{
|
|
case CCP_WIN_A_TO_POSIX:
|
|
case CCP_POSIX_TO_WIN_A:
|
|
if (size == 0)
|
|
return conv_path_list_buf_size ((const char *) from,
|
|
what == CCP_WIN_A_TO_POSIX);
|
|
ret = conv_path_list ((const char *) from, (char *) to, size, what);
|
|
/* Free winp buffer in case of CCP_WIN_W_TO_POSIX. */
|
|
if (winp)
|
|
free (winp);
|
|
/* Convert to WCHAR in case of CCP_POSIX_TO_WIN_W. */
|
|
if (orig_to)
|
|
sys_mbstowcs ((wchar_t *) orig_to, size / sizeof (WCHAR),
|
|
(const char *) to, (size_t) -1);
|
|
return_with_errno (ret);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
/* cygwin_split_path: Split a path into directory and file name parts.
|
|
Buffers DIR and FILE are assumed to be big enough.
|
|
|
|
Examples (path -> `dir' / `file'):
|
|
/ -> `/' / `'
|
|
"" -> `.' / `'
|
|
. -> `.' / `.' (FIXME: should this be `.' / `'?)
|
|
.. -> `.' / `..' (FIXME: should this be `..' / `'?)
|
|
foo -> `.' / `foo'
|
|
foo/bar -> `foo' / `bar'
|
|
foo/bar/ -> `foo' / `bar'
|
|
/foo -> `/' / `foo'
|
|
/foo/bar -> `/foo' / `bar'
|
|
c: -> `c:/' / `'
|
|
c:/ -> `c:/' / `'
|
|
c:foo -> `c:/' / `foo'
|
|
c:/foo -> `c:/' / `foo'
|
|
*/
|
|
|
|
extern "C" void
|
|
cygwin_split_path (const char *path, char *dir, char *file)
|
|
{
|
|
int dir_started_p = 0;
|
|
|
|
/* Deal with drives.
|
|
Remember that c:foo <==> c:/foo. */
|
|
if (isdrive (path))
|
|
{
|
|
*dir++ = *path++;
|
|
*dir++ = *path++;
|
|
*dir++ = '/';
|
|
if (!*path)
|
|
{
|
|
*dir = 0;
|
|
*file = 0;
|
|
return;
|
|
}
|
|
if (isdirsep (*path))
|
|
++path;
|
|
dir_started_p = 1;
|
|
}
|
|
|
|
/* Determine if there are trailing slashes and "delete" them if present.
|
|
We pretend as if they don't exist. */
|
|
const char *end = path + strlen (path);
|
|
/* path + 1: keep leading slash. */
|
|
while (end > path + 1 && isdirsep (end[-1]))
|
|
--end;
|
|
|
|
/* At this point, END points to one beyond the last character
|
|
(with trailing slashes "deleted"). */
|
|
|
|
/* Point LAST_SLASH at the last slash (duh...). */
|
|
const char *last_slash;
|
|
for (last_slash = end - 1; last_slash >= path; --last_slash)
|
|
if (isdirsep (*last_slash))
|
|
break;
|
|
|
|
if (last_slash == path)
|
|
{
|
|
*dir++ = '/';
|
|
*dir = 0;
|
|
}
|
|
else if (last_slash > path)
|
|
{
|
|
memcpy (dir, path, last_slash - path);
|
|
dir[last_slash - path] = 0;
|
|
}
|
|
else
|
|
{
|
|
if (dir_started_p)
|
|
; /* nothing to do */
|
|
else
|
|
*dir++ = '.';
|
|
*dir = 0;
|
|
}
|
|
|
|
memcpy (file, last_slash + 1, end - last_slash - 1);
|
|
file[end - last_slash - 1] = 0;
|
|
}
|
|
|
|
static inline void
|
|
copy_cwd_str (PUNICODE_STRING tgt, PUNICODE_STRING src)
|
|
{
|
|
RtlCopyUnicodeString (tgt, src);
|
|
if (tgt->Buffer[tgt->Length / sizeof (WCHAR) - 1] != L'\\')
|
|
{
|
|
tgt->Buffer[tgt->Length / sizeof (WCHAR)] = L'\\';
|
|
tgt->Length += sizeof (WCHAR);
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|
|
/* The find_fast_cwd_pointer function and parts of the
|
|
cwdstuff::override_win32_cwd method are based on code using the
|
|
following license:
|
|
|
|
Copyright 2010 John Carey. All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
1. Redistributions of source code must retain the above
|
|
copyright notice, this list of conditions and the following
|
|
disclaimer.
|
|
|
|
2. Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the following
|
|
disclaimer in the documentation and/or other materials provided
|
|
with the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY JOHN CAREY ``AS IS'' AND ANY EXPRESS
|
|
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL JOHN CAREY OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
|
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
|
|
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
|
|
DAMAGE. */
|
|
|
|
void
|
|
fcwd_access_t::SetFSCharacteristics (LONG val)
|
|
{
|
|
/* Special case FSCharacteristics. Didn't exist originally. */
|
|
switch (fast_cwd_version ())
|
|
{
|
|
case FCWD_OLD:
|
|
break;
|
|
case FCWD_W7:
|
|
f7.FSCharacteristics = val;
|
|
break;
|
|
case FCWD_W8:
|
|
f8.FSCharacteristics = val;
|
|
break;
|
|
}
|
|
}
|
|
|
|
fcwd_version_t &
|
|
fcwd_access_t::fast_cwd_version ()
|
|
{
|
|
return cygheap->cwd.fast_cwd_version;
|
|
}
|
|
|
|
void
|
|
fcwd_access_t::CopyPath (UNICODE_STRING &target)
|
|
{
|
|
/* Copy the Path contents over into the UNICODE_STRING referenced by
|
|
target. This is used to set the CurrentDirectoryName in the
|
|
user parameter block. */
|
|
target = Path ();
|
|
}
|
|
|
|
void
|
|
fcwd_access_t::Free (PVOID heap)
|
|
{
|
|
/* Decrement the reference count. If it's down to 0, free
|
|
structure from heap. */
|
|
if (InterlockedDecrement (&ReferenceCount ()) == 0)
|
|
{
|
|
/* The handle on init is always a fresh one, not the handle inherited
|
|
from the parent process. We always have to close it here.
|
|
Note: The handle could be NULL, if we cd'ed into a virtual dir. */
|
|
HANDLE h = DirectoryHandle ();
|
|
if (h)
|
|
NtClose (h);
|
|
RtlFreeHeap (heap, 0, this);
|
|
}
|
|
}
|
|
|
|
void
|
|
fcwd_access_t::FillIn (HANDLE dir, PUNICODE_STRING name,
|
|
ULONG old_dismount_count)
|
|
{
|
|
/* Fill in all values into this FAST_CWD structure. */
|
|
DirectoryHandle () = dir;
|
|
ReferenceCount () = 1;
|
|
OldDismountCount () = old_dismount_count;
|
|
/* The new structure stores the device characteristics of the
|
|
volume holding the dir. RtlGetCurrentDirectory_U checks
|
|
if the FILE_REMOVABLE_MEDIA flag is set and, if so, checks if
|
|
the volume is still the same as the one used when opening
|
|
the directory handle.
|
|
We don't call NtQueryVolumeInformationFile for the \\?\PIPE,
|
|
though. It just returns STATUS_INVALID_HANDLE anyway. */
|
|
if (fast_cwd_version () != FCWD_OLD)
|
|
{
|
|
SetFSCharacteristics (0);
|
|
if (name != &ro_u_pipedir)
|
|
{
|
|
IO_STATUS_BLOCK io;
|
|
FILE_FS_DEVICE_INFORMATION ffdi;
|
|
if (NT_SUCCESS (NtQueryVolumeInformationFile (dir, &io, &ffdi,
|
|
sizeof ffdi, FileFsDeviceInformation)))
|
|
SetFSCharacteristics (ffdi.Characteristics);
|
|
}
|
|
}
|
|
RtlInitEmptyUnicodeString (&Path (), Buffer (),
|
|
MAX_PATH * sizeof (WCHAR));
|
|
copy_cwd_str (&Path (), name);
|
|
}
|
|
|
|
void
|
|
fcwd_access_t::SetDirHandleFromBufferPointer (PWCHAR buf_p, HANDLE dir)
|
|
{
|
|
/* Input: The buffer pointer as it's stored in the user parameter block
|
|
and a directory handle.
|
|
This function computes the address to the FAST_CWD structure based
|
|
on the version and overwrites the directory handle. It is only
|
|
used if we couldn't figure out the address of fast_cwd_ptr. */
|
|
fcwd_access_t *f_cwd;
|
|
switch (fast_cwd_version ())
|
|
{
|
|
case FCWD_OLD:
|
|
default:
|
|
f_cwd = (fcwd_access_t *)
|
|
((PBYTE) buf_p - __builtin_offsetof (FAST_CWD_OLD, Buffer));
|
|
break;
|
|
case FCWD_W7:
|
|
f_cwd = (fcwd_access_t *)
|
|
((PBYTE) buf_p - __builtin_offsetof (FAST_CWD_7, Buffer));
|
|
break;
|
|
case FCWD_W8:
|
|
f_cwd = (fcwd_access_t *)
|
|
((PBYTE) buf_p - __builtin_offsetof (FAST_CWD_8, Buffer));
|
|
break;
|
|
}
|
|
f_cwd->DirectoryHandle () = dir;
|
|
}
|
|
|
|
void
|
|
fcwd_access_t::SetVersionFromPointer (PBYTE buf_p, bool is_buffer)
|
|
{
|
|
/* Given a pointer to the FAST_CWD structure (is_buffer == false) or a
|
|
pointer to the Buffer within (is_buffer == true), this function
|
|
computes the FAST_CWD version by checking that Path.MaximumLength
|
|
equals MAX_PATH, and that Path.Buffer == Buffer. */
|
|
if (is_buffer)
|
|
buf_p -= __builtin_offsetof (FAST_CWD_8, Buffer);
|
|
fcwd_access_t *f_cwd = (fcwd_access_t *) buf_p;
|
|
if (f_cwd->f8.Path.MaximumLength == MAX_PATH * sizeof (WCHAR)
|
|
&& f_cwd->f8.Path.Buffer == f_cwd->f8.Buffer)
|
|
fast_cwd_version () = FCWD_W8;
|
|
else if (f_cwd->f7.Path.MaximumLength == MAX_PATH * sizeof (WCHAR)
|
|
&& f_cwd->f7.Path.Buffer == f_cwd->f7.Buffer)
|
|
fast_cwd_version () = FCWD_W7;
|
|
else
|
|
fast_cwd_version () = FCWD_OLD;
|
|
}
|
|
|
|
/* This function scans the code in ntdll.dll to find the address of the
|
|
global variable used to access the CWD. While the pointer is global,
|
|
it's not exported from the DLL, unfortunately. Therefore we have to
|
|
use some knowledge to figure out the address. */
|
|
|
|
#ifdef __x86_64__
|
|
|
|
#define peek32(x) (*(int32_t *)(x))
|
|
|
|
static fcwd_access_t **
|
|
find_fast_cwd_pointer ()
|
|
{
|
|
/* Fetch entry points of relevant functions in ntdll.dll. */
|
|
HMODULE ntdll = GetModuleHandle ("ntdll.dll");
|
|
if (!ntdll)
|
|
return NULL;
|
|
const uint8_t *get_dir = (const uint8_t *)
|
|
GetProcAddress (ntdll, "RtlGetCurrentDirectory_U");
|
|
const uint8_t *ent_crit = (const uint8_t *)
|
|
GetProcAddress (ntdll, "RtlEnterCriticalSection");
|
|
if (!get_dir || !ent_crit)
|
|
return NULL;
|
|
/* Search first relative call instruction in RtlGetCurrentDirectory_U. */
|
|
const uint8_t *rcall = (const uint8_t *) memchr (get_dir, 0xe8, 80);
|
|
if (!rcall)
|
|
return NULL;
|
|
/* Fetch offset from instruction and compute address of called function.
|
|
This function actually fetches the current FAST_CWD instance and
|
|
performs some other actions, not important to us. */
|
|
const uint8_t *use_cwd = rcall + 5 + peek32 (rcall + 1);
|
|
/* Next we search for the locking mechanism and perform a sanity check.
|
|
On Pre-Windows 8 we basically look for the RtlEnterCriticalSection call.
|
|
Windows 8 does not call RtlEnterCriticalSection. The code manipulates
|
|
the FastPebLock manually, probably because RtlEnterCriticalSection has
|
|
been converted to an inline function. Either way, we test if the code
|
|
uses the FastPebLock. */
|
|
const uint8_t *movrbx;
|
|
const uint8_t *lock = (const uint8_t *)
|
|
memmem ((const char *) use_cwd, 80,
|
|
"\xf0\x0f\xba\x35", 4);
|
|
if (lock)
|
|
{
|
|
/* The lock instruction tweaks the LockCount member, which is not at
|
|
the start of the PRTL_CRITICAL_SECTION structure. So we have to
|
|
subtract the offset of LockCount to get the real address. */
|
|
PRTL_CRITICAL_SECTION lockaddr =
|
|
(PRTL_CRITICAL_SECTION) (lock + 9 + peek32 (lock + 4)
|
|
- offsetof (RTL_CRITICAL_SECTION, LockCount));
|
|
/* Test if lock address is FastPebLock. */
|
|
if (lockaddr != NtCurrentTeb ()->Peb->FastPebLock)
|
|
return NULL;
|
|
/* Search `mov rel(%rip),%rbx'. This is the instruction fetching the
|
|
address of the current fcwd_access_t pointer, and it should be pretty
|
|
near to the locking stuff. */
|
|
movrbx = (const uint8_t *) memmem ((const char *) lock, 40,
|
|
"\x48\x8b\x1d", 3);
|
|
}
|
|
else
|
|
{
|
|
/* Usually the callq RtlEnterCriticalSection follows right after
|
|
fetching the lock address. */
|
|
int call_rtl_offset = 7;
|
|
/* Search `lea rel(%rip),%rcx'. This loads the address of the lock into
|
|
%rcx for the subsequent RtlEnterCriticalSection call. */
|
|
lock = (const uint8_t *) memmem ((const char *) use_cwd, 80,
|
|
"\x48\x8d\x0d", 3);
|
|
if (!lock)
|
|
{
|
|
/* Windows 8.1 Preview calls `lea rel(rip),%r12' then some unrelated
|
|
or, then `mov %r12,%rcx', then `callq RtlEnterCriticalSection'. */
|
|
lock = (const uint8_t *) memmem ((const char *) use_cwd, 80,
|
|
"\x4c\x8d\x25", 3);
|
|
if (!lock)
|
|
return NULL;
|
|
call_rtl_offset = 14;
|
|
}
|
|
PRTL_CRITICAL_SECTION lockaddr =
|
|
(PRTL_CRITICAL_SECTION) (lock + 7 + peek32 (lock + 3));
|
|
/* Test if lock address is FastPebLock. */
|
|
if (lockaddr != NtCurrentTeb ()->Peb->FastPebLock)
|
|
return NULL;
|
|
/* Next is the `callq RtlEnterCriticalSection'. */
|
|
lock += call_rtl_offset;
|
|
if (lock[0] != 0xe8)
|
|
return NULL;
|
|
const uint8_t *call_addr = (const uint8_t *)
|
|
(lock + 5 + peek32 (lock + 1));
|
|
if (call_addr != ent_crit)
|
|
return NULL;
|
|
/* In contrast to the above Windows 8 code, we don't have to search
|
|
for the `mov rel(%rip),%rbx' instruction. It follows right after
|
|
the call to RtlEnterCriticalSection. */
|
|
movrbx = lock + 5;
|
|
}
|
|
if (!movrbx)
|
|
return NULL;
|
|
/* Check that the next instruction tests if the fetched value is NULL. */
|
|
const uint8_t *testrbx = (const uint8_t *)
|
|
memmem (movrbx + 7, 3, "\x48\x85\xdb", 3);
|
|
if (!testrbx)
|
|
return NULL;
|
|
/* Compute address of the fcwd_access_t ** pointer. */
|
|
return (fcwd_access_t **) (testrbx + peek32 (movrbx + 3));
|
|
}
|
|
#else
|
|
|
|
#define peek32(x) (*(uint32_t *)(x))
|
|
|
|
static fcwd_access_t **
|
|
find_fast_cwd_pointer ()
|
|
{
|
|
/* Fetch entry points of relevant functions in ntdll.dll. */
|
|
HMODULE ntdll = GetModuleHandle ("ntdll.dll");
|
|
if (!ntdll)
|
|
return NULL;
|
|
const uint8_t *get_dir = (const uint8_t *)
|
|
GetProcAddress (ntdll, "RtlGetCurrentDirectory_U");
|
|
const uint8_t *ent_crit = (const uint8_t *)
|
|
GetProcAddress (ntdll, "RtlEnterCriticalSection");
|
|
if (!get_dir || !ent_crit)
|
|
return NULL;
|
|
/* Search first relative call instruction in RtlGetCurrentDirectory_U. */
|
|
const uint8_t *rcall = (const uint8_t *) memchr (get_dir, 0xe8, 64);
|
|
if (!rcall)
|
|
return NULL;
|
|
/* Fetch offset from instruction and compute address of called function.
|
|
This function actually fetches the current FAST_CWD instance and
|
|
performs some other actions, not important to us. */
|
|
ptrdiff_t offset = (ptrdiff_t) peek32 (rcall + 1);
|
|
const uint8_t *use_cwd = rcall + 5 + offset;
|
|
/* Find first `push %edi' instruction. */
|
|
const uint8_t *pushedi = (const uint8_t *) memchr (use_cwd, 0x57, 32);
|
|
if (!pushedi)
|
|
return NULL;
|
|
/* ...which should be followed by `mov crit-sect-addr,%edi' then
|
|
`push %edi', or by just a single `push crit-sect-addr'. */
|
|
const uint8_t *movedi = pushedi + 1;
|
|
const uint8_t *mov_pfast_cwd;
|
|
if (movedi[0] == 0x8b && movedi[1] == 0xff) /* mov %edi,%edi -> W8 */
|
|
{
|
|
/* Windows 8 does not call RtlEnterCriticalSection. The code manipulates
|
|
the FastPebLock manually, probably because RtlEnterCriticalSection has
|
|
been converted to an inline function.
|
|
|
|
Next we search for a `mov some address,%eax'. This address points
|
|
to the LockCount member of the FastPebLock structure, so the address
|
|
is equal to FastPebLock + 4. */
|
|
const uint8_t *moveax = (const uint8_t *) memchr (movedi, 0xb8, 16);
|
|
if (!moveax)
|
|
return NULL;
|
|
offset = (ptrdiff_t) peek32 (moveax + 1) - 4;
|
|
/* Compare the address with the known PEB lock as stored in the PEB. */
|
|
if ((PRTL_CRITICAL_SECTION) offset != NtCurrentTeb ()->Peb->FastPebLock)
|
|
return NULL;
|
|
/* Now search for the mov instruction fetching the address of the global
|
|
PFAST_CWD *. */
|
|
mov_pfast_cwd = moveax;
|
|
do
|
|
{
|
|
mov_pfast_cwd = (const uint8_t *) memchr (++mov_pfast_cwd, 0x8b, 48);
|
|
}
|
|
while (mov_pfast_cwd && mov_pfast_cwd[1] != 0x1d
|
|
&& (mov_pfast_cwd - moveax) < 48);
|
|
if (!mov_pfast_cwd || mov_pfast_cwd[1] != 0x1d)
|
|
return NULL;
|
|
}
|
|
else
|
|
{
|
|
if (movedi[0] == 0xbf && movedi[5] == 0x57)
|
|
rcall = movedi + 6;
|
|
else if (movedi[0] == 0x68)
|
|
rcall = movedi + 5;
|
|
else if (movedi[0] == 0x88 && movedi[4] == 0x83 && movedi[7] == 0x68)
|
|
{
|
|
/* Windows 8.1 Preview: The `mov lock_addr,%edi' is actually a
|
|
`mov %cl,15(%esp), followed by an `or #-1,%ebx, followed by a
|
|
`push lock_addr'. */
|
|
movedi += 7;
|
|
rcall = movedi + 5;
|
|
}
|
|
else
|
|
return NULL;
|
|
/* Compare the address used for the critical section with the known
|
|
PEB lock as stored in the PEB. */
|
|
if ((PRTL_CRITICAL_SECTION) peek32 (movedi + 1)
|
|
!= NtCurrentTeb ()->Peb->FastPebLock)
|
|
return NULL;
|
|
/* To check we are seeing the right code, we check our expectation that
|
|
the next instruction is a relative call into RtlEnterCriticalSection. */
|
|
if (rcall[0] != 0xe8)
|
|
return NULL;
|
|
/* Check that this is a relative call to RtlEnterCriticalSection. */
|
|
offset = (ptrdiff_t) peek32 (rcall + 1);
|
|
if (rcall + 5 + offset != ent_crit)
|
|
return NULL;
|
|
mov_pfast_cwd = rcall + 5;
|
|
}
|
|
/* After locking the critical section, the code should read the global
|
|
PFAST_CWD * pointer that is guarded by that critical section. */
|
|
if (mov_pfast_cwd[0] != 0x8b)
|
|
return NULL;
|
|
return (fcwd_access_t **) peek32 (mov_pfast_cwd + 2);
|
|
}
|
|
#endif
|
|
|
|
static fcwd_access_t **
|
|
find_fast_cwd ()
|
|
{
|
|
/* Fetch the pointer but don't set the global fast_cwd_ptr yet. First
|
|
we have to make sure we know the version of the FAST_CWD structure
|
|
used on the system. */
|
|
fcwd_access_t **f_cwd_ptr = find_fast_cwd_pointer ();
|
|
if (!f_cwd_ptr)
|
|
{
|
|
bool warn = 1;
|
|
USHORT emulated, hosted;
|
|
|
|
/* Check if we're running in WOW64 on ARM64 emulating AMD64. Skip
|
|
warning as long as there's no solution for finding the FAST_CWD
|
|
pointer on that system. */
|
|
if (IsWow64Process2 (GetCurrentProcess (), &emulated, &hosted)
|
|
&& hosted == IMAGE_FILE_MACHINE_ARM64)
|
|
warn = 0;
|
|
|
|
if (warn)
|
|
small_printf ("Cygwin WARNING:\n"
|
|
" Couldn't compute FAST_CWD pointer. This typically occurs if you're using\n"
|
|
" an older Cygwin version on a newer Windows. Please update to the latest\n"
|
|
" available Cygwin version from https://cygwin.com/. If the problem persists,\n"
|
|
" please see https://cygwin.com/problems.html\n\n");
|
|
}
|
|
if (f_cwd_ptr && *f_cwd_ptr)
|
|
{
|
|
/* Just evaluate structure version. */
|
|
fcwd_access_t::SetVersionFromPointer ((PBYTE) *f_cwd_ptr, false);
|
|
}
|
|
else
|
|
{
|
|
/* If we couldn't fetch fast_cwd_ptr, or if fast_cwd_ptr is NULL(*)
|
|
we have to figure out the version from the Buffer pointer in the
|
|
ProcessParameters.
|
|
|
|
(*) This is very unlikely to happen when starting the first
|
|
Cygwin process, since it only happens when starting the
|
|
process in a directory which can't be used as CWD by Win32, or
|
|
if the directory doesn't exist. But *if* it happens, we have
|
|
no valid FAST_CWD structure, even though upp_cwd_str.Buffer is
|
|
not NULL in that case. So we let the OS create a valid
|
|
FAST_CWD structure temporarily to have something to work with.
|
|
We know the pipe FS works. */
|
|
PEB &peb = *NtCurrentTeb ()->Peb;
|
|
|
|
if (f_cwd_ptr /* so *f_cwd_ptr == NULL */
|
|
&& !NT_SUCCESS (RtlSetCurrentDirectory_U (&ro_u_pipedir)))
|
|
api_fatal ("Couldn't set directory to %S temporarily.\n"
|
|
"Cannot continue.", &ro_u_pipedir);
|
|
RtlEnterCriticalSection (peb.FastPebLock);
|
|
fcwd_access_t::SetVersionFromPointer
|
|
((PBYTE) peb.ProcessParameters->CurrentDirectoryName.Buffer, true);
|
|
RtlLeaveCriticalSection (peb.FastPebLock);
|
|
}
|
|
/* Eventually, after we set the version as well, set fast_cwd_ptr. */
|
|
return f_cwd_ptr;
|
|
}
|
|
|
|
void
|
|
cwdstuff::override_win32_cwd (bool init, ULONG old_dismount_count)
|
|
{
|
|
HANDLE h = NULL;
|
|
|
|
PEB &peb = *NtCurrentTeb ()->Peb;
|
|
UNICODE_STRING &upp_cwd_str = peb.ProcessParameters->CurrentDirectoryName;
|
|
HANDLE &upp_cwd_hdl = peb.ProcessParameters->CurrentDirectoryHandle;
|
|
|
|
if (fast_cwd_ptr == (fcwd_access_t **) -1)
|
|
fast_cwd_ptr = find_fast_cwd ();
|
|
if (fast_cwd_ptr)
|
|
{
|
|
/* If we got a valid value for fast_cwd_ptr, we can simply replace
|
|
the RtlSetCurrentDirectory_U function entirely. */
|
|
PVOID heap = peb.ProcessHeap;
|
|
/* First allocate a new fcwd_access_t structure on the heap.
|
|
The new fcwd_access_t structure is 4 byte bigger than the old one,
|
|
but we simply don't care, so we allocate always room for the
|
|
new one. */
|
|
fcwd_access_t *f_cwd = (fcwd_access_t *)
|
|
RtlAllocateHeap (heap, 0, sizeof (fcwd_access_t));
|
|
if (!f_cwd)
|
|
{
|
|
debug_printf ("RtlAllocateHeap failed");
|
|
return;
|
|
}
|
|
/* Fill in the values. */
|
|
f_cwd->FillIn (dir, error ? &ro_u_pipedir : &win32,
|
|
old_dismount_count);
|
|
/* Use PEB lock when switching fast_cwd_ptr to the new FAST_CWD
|
|
structure and writing the CWD to the user process parameter
|
|
block. This is equivalent to calling RtlAcquirePebLock/
|
|
RtlReleasePebLock, but without having to go through the FS
|
|
selector again. */
|
|
RtlEnterCriticalSection (peb.FastPebLock);
|
|
fcwd_access_t *old_cwd = *fast_cwd_ptr;
|
|
*fast_cwd_ptr = f_cwd;
|
|
f_cwd->CopyPath (upp_cwd_str);
|
|
upp_cwd_hdl = dir;
|
|
RtlLeaveCriticalSection (peb.FastPebLock);
|
|
if (old_cwd)
|
|
old_cwd->Free (heap);
|
|
}
|
|
else
|
|
{
|
|
/* Fallback if we failed to find the fast_cwd_ptr value:
|
|
|
|
- Call RtlSetCurrentDirectory_U.
|
|
- Compute new FAST_CWD struct address from buffer pointer in the
|
|
user process parameter block.
|
|
- Replace the directory handle in the struct with our own handle.
|
|
- Close the original handle. RtlSetCurrentDirectory_U already
|
|
closed our former dir handle -> no handle leak.
|
|
|
|
Guard the entire operation with FastPebLock to avoid races
|
|
accessing the PEB and FAST_CWD struct.
|
|
|
|
Unfortunately this method is still prone to a directory usage
|
|
race condition:
|
|
|
|
- The directory is locked against deletion or renaming between the
|
|
RtlSetCurrentDirectory_U and the subsequent NtClose call. */
|
|
if (unlikely (upp_cwd_hdl == NULL) && init)
|
|
return;
|
|
RtlEnterCriticalSection (peb.FastPebLock);
|
|
if (!init)
|
|
{
|
|
NTSTATUS status =
|
|
RtlSetCurrentDirectory_U (error ? &ro_u_pipedir : &win32);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
RtlLeaveCriticalSection (peb.FastPebLock);
|
|
debug_printf ("RtlSetCurrentDirectory_U(%S) failed, %y",
|
|
error ? &ro_u_pipedir : &win32, status);
|
|
return;
|
|
}
|
|
}
|
|
fcwd_access_t::SetDirHandleFromBufferPointer(upp_cwd_str.Buffer, dir);
|
|
h = upp_cwd_hdl;
|
|
upp_cwd_hdl = dir;
|
|
RtlLeaveCriticalSection (peb.FastPebLock);
|
|
/* The handle on init is always a fresh one, not the handle inherited
|
|
from the parent process. We always have to close it here. */
|
|
NtClose (h);
|
|
}
|
|
}
|
|
|
|
/* Initialize cygcwd 'muto' for serializing access to cwd info. */
|
|
void
|
|
cwdstuff::init ()
|
|
{
|
|
cwd_lock.init ("cwd_lock");
|
|
|
|
/* Cygwin processes inherit the cwd from their parent. If the win32 path
|
|
buffer is not NULL, the cwd struct is already set up, and we only
|
|
have to override the Win32 CWD with ours. */
|
|
if (win32.Buffer)
|
|
override_win32_cwd (true, SharedUserData.DismountCount);
|
|
else
|
|
{
|
|
/* Initialize fast_cwd stuff. */
|
|
fast_cwd_ptr = (fcwd_access_t **) -1;
|
|
fast_cwd_version = FCWD_W7;
|
|
/* Initially re-open the cwd to allow POSIX semantics. */
|
|
set (NULL, NULL);
|
|
}
|
|
}
|
|
|
|
/* Chdir and fill out the elements of a cwdstuff struct. */
|
|
int
|
|
cwdstuff::set (path_conv *nat_cwd, const char *posix_cwd)
|
|
{
|
|
NTSTATUS status;
|
|
UNICODE_STRING upath;
|
|
OBJECT_ATTRIBUTES attr;
|
|
PEB &peb = *NtCurrentTeb ()->Peb;
|
|
bool virtual_path = false;
|
|
bool unc_path = false;
|
|
bool inaccessible_path = false;
|
|
|
|
/* Here are the problems with using SetCurrentDirectory. Just skip this
|
|
comment if you don't like whining.
|
|
|
|
- SetCurrentDirectory only supports paths of up to MAX_PATH - 1 chars,
|
|
including a trailing backslash. That's an absolute restriction, even
|
|
in the UNICODE API.
|
|
|
|
- SetCurrentDirectory fails for directories with strict permissions even
|
|
for processes with the SE_BACKUP_NAME privilege enabled. The reason
|
|
is apparently that SetCurrentDirectory calls NtOpenFile without the
|
|
FILE_OPEN_FOR_BACKUP_INTENT flag set.
|
|
|
|
- SetCurrentDirectory does not support case-sensitivity.
|
|
|
|
- Unlinking a cwd fails because SetCurrentDirectory seems to open
|
|
directories so that deleting the directory is disallowed.
|
|
|
|
- SetCurrentDirectory can naturally not work on virtual Cygwin paths
|
|
like /proc or /cygdrive.
|
|
|
|
Nevertheless, doing entirely without SetCurrentDirectory is not really
|
|
feasible, because it breaks too many mixed applications using the Win32
|
|
API.
|
|
|
|
Therefore we handle the CWD all by ourselves and just keep the Win32
|
|
CWD in sync. However, to avoid surprising behaviour in the Win32 API
|
|
when we are in a CWD which is inaccessible as Win32 CWD, we set the
|
|
Win32 CWD to a "weird" directory in which all relative filesystem-related
|
|
calls fail. */
|
|
|
|
cwd_lock.acquire ();
|
|
|
|
if (nat_cwd)
|
|
{
|
|
upath = *nat_cwd->get_nt_native_path ();
|
|
if (nat_cwd->isspecial ())
|
|
{
|
|
virtual_path = true;
|
|
/* But allow starting of native apps from /dev if /dev actually
|
|
exists on disk. */
|
|
if (isdev_dev (nat_cwd->dev))
|
|
{
|
|
FILE_BASIC_INFORMATION fbi;
|
|
|
|
InitializeObjectAttributes (&attr, &upath,
|
|
OBJ_CASE_INSENSITIVE | OBJ_INHERIT,
|
|
NULL, NULL);
|
|
status = NtQueryAttributesFile (&attr, &fbi);
|
|
if (status != STATUS_OBJECT_NAME_NOT_FOUND
|
|
&& status != STATUS_OBJECT_PATH_NOT_FOUND)
|
|
virtual_path = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Memorize old DismountCount before opening the dir. This value is
|
|
stored in the FAST_CWD structure. It would be simpler to fetch the
|
|
old DismountCount in override_win32_cwd, but Windows also fetches
|
|
it before opening the directory handle. It's not quite clear if
|
|
that's really required, but since we don't know the side effects of
|
|
this action, we better follow Windows' lead. */
|
|
ULONG old_dismount_count = SharedUserData.DismountCount;
|
|
/* Open a directory handle with FILE_OPEN_FOR_BACKUP_INTENT and with all
|
|
sharing flags set. The handle is right now used in exceptions.cc only,
|
|
but that might change in future. */
|
|
HANDLE h = NULL;
|
|
if (!virtual_path)
|
|
{
|
|
IO_STATUS_BLOCK io;
|
|
|
|
if (!nat_cwd)
|
|
{
|
|
/* On init, just reopen Win32 CWD with desired access flags.
|
|
We can access the PEB without lock, because no other thread
|
|
can change the CWD. However, there's a chance that the handle
|
|
is NULL, even though CurrentDirectoryName isn't so we have to
|
|
be careful. */
|
|
if (!peb.ProcessParameters->CurrentDirectoryHandle)
|
|
{
|
|
InitializeObjectAttributes (&attr,
|
|
&peb.ProcessParameters->CurrentDirectoryName,
|
|
OBJ_CASE_INSENSITIVE | OBJ_INHERIT, NULL, NULL);
|
|
}
|
|
else
|
|
{
|
|
RtlInitUnicodeString (&upath, L"");
|
|
InitializeObjectAttributes (&attr,
|
|
&upath, OBJ_CASE_INSENSITIVE | OBJ_INHERIT,
|
|
peb.ProcessParameters->CurrentDirectoryHandle,
|
|
NULL);
|
|
}
|
|
}
|
|
else
|
|
InitializeObjectAttributes (&attr, &upath,
|
|
nat_cwd->objcaseinsensitive () | OBJ_INHERIT,
|
|
NULL, NULL);
|
|
/* First try without FILE_OPEN_FOR_BACKUP_INTENT, to find out if the
|
|
directory is valid for Win32 apps. And, no, we can't just call
|
|
SetCurrentDirectory here, since that would potentially break
|
|
case-sensitivity. */
|
|
status = NtOpenFile (&h, SYNCHRONIZE | FILE_TRAVERSE, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
FILE_DIRECTORY_FILE
|
|
| FILE_SYNCHRONOUS_IO_NONALERT);
|
|
if (status == STATUS_ACCESS_DENIED)
|
|
{
|
|
status = NtOpenFile (&h, SYNCHRONIZE | FILE_TRAVERSE, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
FILE_DIRECTORY_FILE
|
|
| FILE_SYNCHRONOUS_IO_NONALERT
|
|
| FILE_OPEN_FOR_BACKUP_INTENT);
|
|
inaccessible_path = true;
|
|
}
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
/* Called from chdir? Just fail. */
|
|
if (nat_cwd)
|
|
{
|
|
cwd_lock.release ();
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
/* Otherwise we're in init and posix hasn't been set yet. Try to
|
|
duplicate the handle instead. If that fails, too, set dir to NULL
|
|
and carry on. This will at least set posix to some valid path at
|
|
process startup, and subsequent getcwd calls don't EFAULT. */
|
|
debug_printf ("WARNING: Can't reopen CWD %y '%S', status %y",
|
|
peb.ProcessParameters->CurrentDirectoryHandle,
|
|
&peb.ProcessParameters->CurrentDirectoryName,
|
|
status);
|
|
if (!peb.ProcessParameters->CurrentDirectoryHandle
|
|
|| !DuplicateHandle (GetCurrentProcess (),
|
|
peb.ProcessParameters->CurrentDirectoryHandle,
|
|
GetCurrentProcess (), &h, 0, TRUE, 0))
|
|
{
|
|
cwd_lock.release ();
|
|
if (peb.ProcessParameters->CurrentDirectoryHandle)
|
|
debug_printf ("...and DuplicateHandle failed with %E.");
|
|
dir = NULL;
|
|
}
|
|
}
|
|
}
|
|
/* Set new handle. Note that we simply overwrite the old handle here
|
|
without closing it. The handle is also used as Win32 CWD handle in
|
|
the user parameter block, and it will be closed in override_win32_cwd,
|
|
if required. */
|
|
dir = h;
|
|
|
|
if (!nat_cwd)
|
|
{
|
|
/* On init, just fetch the Win32 dir from the PEB. We can access
|
|
the PEB without lock, because no other thread can change the CWD
|
|
at that time. */
|
|
PUNICODE_STRING pdir = &peb.ProcessParameters->CurrentDirectoryName;
|
|
RtlInitEmptyUnicodeString (&win32,
|
|
(PWCHAR) crealloc_abort (win32.Buffer,
|
|
pdir->Length
|
|
+ sizeof (WCHAR)),
|
|
pdir->Length + sizeof (WCHAR));
|
|
RtlCopyUnicodeString (&win32, pdir);
|
|
|
|
PWSTR eoBuffer = win32.Buffer + (win32.Length / sizeof (WCHAR));
|
|
/* Remove trailing slash if one exists. */
|
|
if ((eoBuffer - win32.Buffer) > 3 && eoBuffer[-1] == L'\\')
|
|
win32.Length -= sizeof (WCHAR);
|
|
if (eoBuffer[0] == L'\\')
|
|
unc_path = true;
|
|
|
|
posix_cwd = NULL;
|
|
}
|
|
else
|
|
{
|
|
if (!virtual_path) /* don't mangle virtual path. */
|
|
{
|
|
/* Convert into Win32 path and compute length. */
|
|
if (upath.Buffer[1] == L'?')
|
|
{
|
|
upath.Buffer += 4;
|
|
upath.Length -= 4 * sizeof (WCHAR);
|
|
if (upath.Buffer[1] != L':')
|
|
{
|
|
/* UNC path */
|
|
upath.Buffer += 2;
|
|
upath.Length -= 2 * sizeof (WCHAR);
|
|
unc_path = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Path via native NT namespace. Prepend GLOBALROOT prefix
|
|
to create a valid Win32 path. */
|
|
PWCHAR buf = (PWCHAR) alloca (upath.Length
|
|
+ ro_u_globalroot.Length
|
|
+ sizeof (WCHAR));
|
|
wcpcpy (wcpcpy (buf, ro_u_globalroot.Buffer), upath.Buffer);
|
|
upath.Buffer = buf;
|
|
upath.Length += ro_u_globalroot.Length;
|
|
}
|
|
PWSTR eoBuffer = upath.Buffer + (upath.Length / sizeof (WCHAR));
|
|
/* Remove trailing slash if one exists. */
|
|
if ((eoBuffer - upath.Buffer) > 3 && eoBuffer[-1] == L'\\')
|
|
upath.Length -= sizeof (WCHAR);
|
|
}
|
|
RtlInitEmptyUnicodeString (&win32,
|
|
(PWCHAR) crealloc_abort (win32.Buffer,
|
|
upath.Length
|
|
+ sizeof (WCHAR)),
|
|
upath.Length + sizeof (WCHAR));
|
|
RtlCopyUnicodeString (&win32, &upath);
|
|
if (unc_path)
|
|
win32.Buffer[0] = L'\\';
|
|
}
|
|
/* Make sure it's NUL-terminated. */
|
|
win32.Buffer[win32.Length / sizeof (WCHAR)] = L'\0';
|
|
|
|
/* Set drive_length, used in path conversion, and error code, used in
|
|
spawn_guts to decide whether a native Win32 app can be started or not. */
|
|
if (virtual_path)
|
|
{
|
|
drive_length = 0;
|
|
error = ENOTDIR;
|
|
}
|
|
else
|
|
{
|
|
if (!unc_path)
|
|
drive_length = 2;
|
|
else
|
|
{
|
|
PWCHAR ptr = wcschr (win32.Buffer + 2, L'\\');
|
|
if (ptr)
|
|
ptr = wcschr (ptr + 1, L'\\');
|
|
if (ptr)
|
|
drive_length = ptr - win32.Buffer;
|
|
else
|
|
drive_length = win32.Length / sizeof (WCHAR);
|
|
}
|
|
if (inaccessible_path)
|
|
error = EACCES;
|
|
else if (win32.Length > (MAX_PATH - 2) * sizeof (WCHAR))
|
|
error = ENAMETOOLONG;
|
|
else
|
|
error = 0;
|
|
}
|
|
/* Keep the Win32 CWD in sync. Don't check for error, other than for
|
|
strace output. Try to keep overhead low. */
|
|
override_win32_cwd (!nat_cwd, old_dismount_count);
|
|
|
|
/* Eventually, create POSIX path if it's not set on entry. */
|
|
tmp_pathbuf tp;
|
|
if (!posix_cwd)
|
|
{
|
|
posix_cwd = (const char *) tp.c_get ();
|
|
mount_table->conv_to_posix_path (win32.Buffer, (char *) posix_cwd, 0);
|
|
}
|
|
posix = (char *) crealloc_abort (posix, strlen (posix_cwd) + 1);
|
|
stpcpy (posix, posix_cwd);
|
|
|
|
cwd_lock.release ();
|
|
return 0;
|
|
}
|
|
|
|
const char *
|
|
cwdstuff::get_error_desc () const
|
|
{
|
|
switch (cygheap->cwd.get_error ())
|
|
{
|
|
case EACCES:
|
|
return "has restricted permissions which render it\n"
|
|
"inaccessible as Win32 working directory";
|
|
case ENOTDIR:
|
|
return "is a virtual Cygwin directory which does\n"
|
|
"not exist for a native Windows application";
|
|
case ENAMETOOLONG:
|
|
return "has a path longer than allowed for a\n"
|
|
"Win32 working directory";
|
|
default:
|
|
break;
|
|
}
|
|
/* That shouldn't occur, unless we defined a new error code
|
|
in cwdstuff::set. */
|
|
return "is not accessible for some unknown reason";
|
|
}
|
|
|
|
/* Store incoming wchar_t path as current posix cwd. This is called from
|
|
setlocale so that the cwd is always stored in the right charset. */
|
|
void
|
|
cwdstuff::reset_posix (wchar_t *w_cwd)
|
|
{
|
|
size_t len = sys_wcstombs (NULL, (size_t) -1, w_cwd);
|
|
posix = (char *) crealloc_abort (posix, len + 1);
|
|
sys_wcstombs (posix, len + 1, w_cwd);
|
|
}
|
|
|
|
char *
|
|
cwdstuff::get (char *buf, int need_posix, int with_chroot, unsigned ulen)
|
|
{
|
|
tmp_pathbuf tp;
|
|
|
|
errno = 0;
|
|
if (ulen)
|
|
/* nothing */;
|
|
else if (buf == NULL)
|
|
ulen = (unsigned) -1;
|
|
else
|
|
{
|
|
set_errno (EINVAL);
|
|
goto out;
|
|
}
|
|
|
|
cwd_lock.acquire ();
|
|
|
|
char *tocopy;
|
|
if (!need_posix)
|
|
{
|
|
tocopy = tp.c_get ();
|
|
sys_wcstombs (tocopy, NT_MAX_PATH, win32.Buffer,
|
|
win32.Length / sizeof (WCHAR));
|
|
}
|
|
else
|
|
tocopy = posix;
|
|
|
|
debug_printf ("posix %s", posix);
|
|
if (strlen (tocopy) >= ulen)
|
|
{
|
|
set_errno (ERANGE);
|
|
buf = NULL;
|
|
}
|
|
else
|
|
{
|
|
if (!buf)
|
|
buf = (char *) malloc (strlen (tocopy) + 1);
|
|
strcpy (buf, tocopy);
|
|
if (!buf[0]) /* Should only happen when chroot */
|
|
strcpy (buf, "/");
|
|
}
|
|
|
|
cwd_lock.release ();
|
|
|
|
out:
|
|
syscall_printf ("(%s) = cwdstuff::get (%p, %u, %d, %d), errno %d",
|
|
buf, buf, ulen, need_posix, with_chroot, errno);
|
|
return buf;
|
|
}
|
|
|
|
/* No need to be reentrant or thread-safe according to SUSv3.
|
|
/ and \\ are treated equally. Leading drive specifiers are
|
|
kept intact as far as it makes sense. Everything else is
|
|
POSIX compatible. */
|
|
extern "C" char *
|
|
basename (char *path)
|
|
{
|
|
static char buf[4];
|
|
char *c, *d, *bs = path;
|
|
|
|
if (!path || !*path)
|
|
return strcpy (buf, ".");
|
|
if (isalpha (path[0]) && path[1] == ':')
|
|
bs += 2;
|
|
else if (strspn (path, "/\\") > 1)
|
|
++bs;
|
|
c = strrchr (bs, '/');
|
|
if ((d = strrchr (c ?: bs, '\\')) > c)
|
|
c = d;
|
|
if (c)
|
|
{
|
|
/* Trailing (back)slashes are eliminated. */
|
|
while (c && c > bs && c[1] == '\0')
|
|
{
|
|
*c = '\0';
|
|
c = strrchr (bs, '/');
|
|
if ((d = strrchr (c ?: bs, '\\')) > c)
|
|
c = d;
|
|
}
|
|
if (c && (c > bs || c[1]))
|
|
return c + 1;
|
|
}
|
|
else if (!bs[0])
|
|
{
|
|
stpncpy (buf, path, bs - path);
|
|
stpcpy (buf + (bs - path), ".");
|
|
return buf;
|
|
}
|
|
return path;
|
|
}
|
|
|
|
/* The differences with the POSIX version above:
|
|
- declared in <string.h> (instead of <libgen.h>);
|
|
- the argument is never modified, and therefore is marked const;
|
|
- the empty string is returned if path is an empty string, "/", or ends
|
|
with a trailing slash. */
|
|
extern "C" char *
|
|
__gnu_basename (const char *path)
|
|
{
|
|
static char buf[1];
|
|
char *c, *d, *bs = (char *)path;
|
|
|
|
if (!path || !*path)
|
|
return strcpy (buf, "");
|
|
if (isalpha (path[0]) && path[1] == ':')
|
|
bs += 2;
|
|
else if (strspn (path, "/\\") > 1)
|
|
++bs;
|
|
c = strrchr (bs, '/');
|
|
if ((d = strrchr (c ?: bs, '\\')) > c)
|
|
c = d;
|
|
if (c)
|
|
return c + 1;
|
|
else if (!bs[0])
|
|
return strcpy (buf, "");
|
|
return (char *)path;
|
|
}
|
|
|
|
/* No need to be reentrant or thread-safe according to SUSv3.
|
|
/ and \\ are treated equally. Leading drive specifiers and
|
|
leading double (back)slashes are kept intact as far as it
|
|
makes sense. Everything else is POSIX compatible. */
|
|
extern "C" char *
|
|
dirname (char *path)
|
|
{
|
|
static char buf[4];
|
|
char *c, *d, *bs = path;
|
|
|
|
if (!path || !*path)
|
|
return strcpy (buf, ".");
|
|
if (isalpha (path[0]) && path[1] == ':')
|
|
bs += 2;
|
|
else if (strspn (path, "/\\") > 1)
|
|
++bs;
|
|
c = strrchr (bs, '/');
|
|
if ((d = strrchr (c ?: bs, '\\')) > c)
|
|
c = d;
|
|
if (c)
|
|
{
|
|
/* Trailing (back)slashes are eliminated. */
|
|
while (c && c > bs && c[1] == '\0')
|
|
{
|
|
*c = '\0';
|
|
c = strrchr (bs, '/');
|
|
if ((d = strrchr (c ?: bs, '\\')) > c)
|
|
c = d;
|
|
}
|
|
if (!c)
|
|
strcpy (bs, ".");
|
|
else if (c > bs)
|
|
{
|
|
/* More trailing (back)slashes are eliminated. */
|
|
while (c > bs && (*c == '/' || *c == '\\'))
|
|
*c-- = '\0';
|
|
}
|
|
else
|
|
c[1] = '\0';
|
|
}
|
|
else
|
|
{
|
|
stpncpy (buf, path, bs - path);
|
|
stpcpy (buf + (bs - path), ".");
|
|
return buf;
|
|
}
|
|
return path;
|
|
}
|