4279 lines
123 KiB
C++
4279 lines
123 KiB
C++
/* path.cc: path support.
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006, 2007, 2008, 2009, 2010, 2011 Red Hat, Inc.
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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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#include "winsup.h"
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#include "miscfuncs.h"
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#include <ctype.h>
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#include <winioctl.h>
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#include <wingdi.h>
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#include <winuser.h>
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#include <winnetwk.h>
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#include <shlobj.h>
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#include <sys/cygwin.h>
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#include "cygerrno.h"
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#include "security.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 "cygtls.h"
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#include "tls_pbuf.h"
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#include "environ.h"
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#include <assert.h>
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#include <ntdll.h>
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#include <wchar.h>
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#include <wctype.h>
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bool dos_file_warning = true;
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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 pflags;
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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);
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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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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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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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/* Is that a //?/ or //./ prefix into the native NT namespace?
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If so, preserve it. */
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if ((src[1] == '.' || src[1] == '?') && isslash (src[2]))
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{
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*tail++ = *src++;
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*tail++ = *src++;
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dst_start += 2;
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}
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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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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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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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known_suffix = path + sym.extn;
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if (sym.ext_tacked_on)
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strcpy ((char *) known_suffix, sym.ext_here);
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}
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}
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static void __stdcall mkrelpath (char *dst, bool caseinsensitive)
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__attribute__ ((regparm (2)));
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static void __stdcall
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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_normalized_path (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 *) normalized_path, n);
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normalized_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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}
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else
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str2uni_cat (upath, path);
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transform_chars (&upath, 7);
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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 trainlig 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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PUNICODE_STRING
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path_conv::get_nt_native_path ()
|
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{
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if (!wide_path)
|
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{
|
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uni_path.Length = 0;
|
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uni_path.MaximumLength = (strlen (path) + 10) * sizeof (WCHAR);
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wide_path = (PWCHAR) cmalloc_abort (HEAP_STR, uni_path.MaximumLength);
|
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uni_path.Buffer = wide_path;
|
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::get_nt_native_path (path, uni_path, has_dos_filenames_only ());
|
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}
|
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return &uni_path;
|
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}
|
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|
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PWCHAR
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path_conv::get_wide_win32_path (PWCHAR wc)
|
|
{
|
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get_nt_native_path ();
|
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if (!wide_path)
|
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return NULL;
|
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wcpcpy (wc, wide_path);
|
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if (wc[1] == L'?')
|
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wc[1] = L'\\';
|
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return wc;
|
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}
|
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|
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void
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warn_msdos (const char *src)
|
|
{
|
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if (user_shared->warned_msdos || !dos_file_warning || !cygwin_finished_initializing)
|
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return;
|
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tmp_pathbuf tp;
|
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char *posix_path = tp.c_get ();
|
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small_printf ("cygwin warning:\n");
|
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if (cygwin_conv_path (CCP_WIN_A_TO_POSIX | CCP_RELATIVE, src,
|
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posix_path, NT_MAX_PATH))
|
|
small_printf (" MS-DOS style path detected: %ls\n POSIX equivalent preferred.\n",
|
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src);
|
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else
|
|
small_printf (" MS-DOS style path detected: %ls\n Preferred POSIX equivalent is: %ls\n",
|
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src, posix_path);
|
|
small_printf (" CYGWIN environment variable option \"nodosfilewarning\" turns off this warning.\n"
|
|
" Consult the user's guide for more details about POSIX paths:\n"
|
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" http://cygwin.com/cygwin-ug-net/using.html#using-pathnames\n");
|
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user_shared->warned_msdos = true;
|
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}
|
|
|
|
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_DIRECTORY_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 saw_symlinks = 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
|
|
|
|
myfault efault;
|
|
if (efault.faulted ())
|
|
{
|
|
error = EFAULT;
|
|
return;
|
|
}
|
|
int loop = 0;
|
|
path_flags = 0;
|
|
known_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 ();
|
|
memset (&dev, 0, sizeof (dev));
|
|
fs.clear ();
|
|
if (normalized_path)
|
|
{
|
|
cfree ((void *) normalized_path);
|
|
normalized_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 (;;)
|
|
{
|
|
MALLOC_CHECK;
|
|
assert (src);
|
|
|
|
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;
|
|
|
|
for (unsigned pflags_or = opt & (PC_NO_ACCESS_CHECK | PC_KEEP_HANDLE);
|
|
;
|
|
pflags_or = 0)
|
|
{
|
|
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;
|
|
}
|
|
|
|
/* Convert to native path spec sans symbolic link info. */
|
|
error = mount_table->conv_to_win32_path (path_copy, full_path, dev,
|
|
&sym.pflags);
|
|
|
|
if (error)
|
|
return;
|
|
|
|
sym.pflags |= pflags_or;
|
|
|
|
if (dev.major == DEV_CYGDRIVE_MAJOR)
|
|
{
|
|
if (!component)
|
|
fileattr = FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_READONLY;
|
|
else
|
|
{
|
|
fileattr = getfileattr (THIS_path,
|
|
sym.pflags & MOUNT_NOPOSIX);
|
|
dev.devn = FH_FS;
|
|
}
|
|
goto out;
|
|
}
|
|
else if (dev == FH_DEV)
|
|
{
|
|
dev.devn = FH_FS;
|
|
#if 0
|
|
fileattr = getfileattr (THIS_path, sym.pflags & MOUNT_NOPOSIX);
|
|
if (!component && fileattr == INVALID_FILE_ATTRIBUTES)
|
|
{
|
|
fileattr = FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_READONLY;
|
|
goto out;
|
|
}
|
|
#endif
|
|
}
|
|
else if (isvirtual_dev (dev.devn))
|
|
{
|
|
/* 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 = fh->exists ();
|
|
if (file_type == virt_symlink)
|
|
{
|
|
fh->fill_filebuf ();
|
|
symlen = sym.set (fh->get_filebuf ());
|
|
}
|
|
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_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_TCP);
|
|
}
|
|
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. If the trailing slash has been
|
|
requested, 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 || need_directory)
|
|
{
|
|
dev.parse (FH_FS);
|
|
if (component == 0)
|
|
{
|
|
strcat (full_path, "\\");
|
|
fileattr = FILE_ATTRIBUTE_DIRECTORY
|
|
| FILE_ATTRIBUTE_DEVICE;
|
|
}
|
|
else
|
|
fileattr = 0;
|
|
goto out;
|
|
}
|
|
/*FALLTHRU*/
|
|
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.devn != FH_NETDRIVE)
|
|
path_flags |= PATH_RO;
|
|
goto out;
|
|
}
|
|
/* devn should not be a device. If it is, then stop parsing now. */
|
|
else if (dev.devn != FH_FS)
|
|
{
|
|
fileattr = 0;
|
|
path_flags = sym.pflags;
|
|
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';
|
|
}
|
|
/* Otherwise, if the user requires a directory and explicitely
|
|
specified a path into the native NT namespace, add the trailing
|
|
backslash. It's needed to access the root dir. */
|
|
else if (need_directory
|
|
&& full_path[0] == '\\' && full_path[1] == '\\'
|
|
&& (full_path[2] == '.' || full_path[2] == '?'))
|
|
strcat (full_path, "\\");
|
|
|
|
/* 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.pflags |= PATH_NOPOSIX | PATH_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.pflags & PATH_SOCKET)
|
|
{
|
|
if (component)
|
|
{
|
|
error = ENOTDIR;
|
|
return;
|
|
}
|
|
fileattr = sym.fileattr;
|
|
dev.parse (FH_UNIX);
|
|
dev.setfs (1);
|
|
goto out;
|
|
}
|
|
|
|
if (!component)
|
|
{
|
|
fileattr = sym.fileattr;
|
|
path_flags = sym.pflags;
|
|
}
|
|
|
|
/* 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. If 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 > 0)
|
|
{
|
|
saw_symlinks = 1;
|
|
if (component == 0 && !need_directory
|
|
&& (!(opt & PC_SYM_FOLLOW)
|
|
|| (is_rep_symlink () && (opt & PC_SYM_NOFOLLOW_REP))))
|
|
{
|
|
set_symlink (symlen); // last component of path is a symlink.
|
|
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;
|
|
}
|
|
|
|
MALLOC_CHECK;
|
|
|
|
|
|
/* 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.devn == 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.devn) && 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)
|
|
strcat (modifiable_path (), "\\"); /* Reattach trailing dirsep in native path. */
|
|
else if (fileattr & FILE_ATTRIBUTE_DIRECTORY)
|
|
path_flags &= ~PATH_SYMLINK;
|
|
else
|
|
{
|
|
debug_printf ("%s is a non-directory", path);
|
|
error = ENOTDIR;
|
|
return;
|
|
}
|
|
|
|
if (dev.isfs ())
|
|
{
|
|
if (strncmp (path, "\\\\.\\", 4))
|
|
{
|
|
if (!tail || tail == path)
|
|
/* nothing */;
|
|
else if (tail[-1] != '\\')
|
|
*tail = '\0';
|
|
else
|
|
{
|
|
error = ENOENT;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* 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 PATH_NOACL flag must be taken into
|
|
account here. */
|
|
if (!(path_flags & PATH_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 unrelibale inodes, note
|
|
that in path_flags. */
|
|
if (!fs.hasgood_inode ())
|
|
path_flags |= PATH_IHASH;
|
|
/* If the OS is caseinsensitive or the FS is caseinsensitive,
|
|
don't handle path casesensitive. */
|
|
if (cygwin_shared->obcaseinsensitive || fs.caseinsensitive ())
|
|
path_flags |= PATH_NOPOSIX;
|
|
caseinsensitive = (path_flags & PATH_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);
|
|
}
|
|
|
|
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 (saw_symlinks)
|
|
set_has_symlinks ();
|
|
|
|
if ((opt & PC_POSIX))
|
|
{
|
|
if (tail < path_end && tail > path_copy + 1)
|
|
*tail = '/';
|
|
set_normalized_path (path_copy);
|
|
if (is_msdos && !(opt & PC_NOWARN))
|
|
warn_msdos (src);
|
|
}
|
|
|
|
#if 0
|
|
if (!error)
|
|
{
|
|
last_path_conv = *this;
|
|
strcpy (last_src, src);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
path_conv::~path_conv ()
|
|
{
|
|
if (normalized_path)
|
|
{
|
|
cfree ((void *) normalized_path);
|
|
normalized_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);
|
|
}
|
|
|
|
/* 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;
|
|
bool beg_src_slash = isdirsep (src[0]);
|
|
|
|
tail = dst;
|
|
/* Skip long path name prefixes in Win32 or NT syntax. */
|
|
if (beg_src_slash && (src[1] == '?' || isdirsep (src[1]))
|
|
&& src[2] == '?' && isdirsep (src[3]))
|
|
{
|
|
src += 4;
|
|
if (src[1] != ':') /* native UNC path */
|
|
src += 2; /* Fortunately the first char is not copied... */
|
|
else
|
|
beg_src_slash = false;
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
if (tail == dst)
|
|
{
|
|
if (isdrive (src))
|
|
/* Always convert drive letter to uppercase for case sensitivity. */
|
|
*tail++ = cyg_toupper (*src++);
|
|
else if (*src != '/')
|
|
{
|
|
if (beg_src_slash)
|
|
tail += cygheap->cwd.get_drive (dst);
|
|
else if (!cygheap->cwd.get (dst, 0))
|
|
return get_errno ();
|
|
else
|
|
{
|
|
tail = strchr (tail, '\0');
|
|
if (tail[-1] != '\\')
|
|
*tail++ = '\\';
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
/* Backup if "..". */
|
|
else if (src[0] == '.' && src[1] == '.'
|
|
/* dst must be greater than dst_start */
|
|
&& 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;
|
|
if (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, src_start);
|
|
return 0;
|
|
}
|
|
|
|
/* Various utilities. */
|
|
|
|
/* nofinalslash: Remove trailing / and \ from SRC (except for the
|
|
first one). It is ok for src == dst. */
|
|
|
|
void __stdcall
|
|
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, int to_posix)
|
|
{
|
|
tmp_pathbuf tp;
|
|
char src_delim, dst_delim;
|
|
cygwin_conv_path_t conv_fn;
|
|
size_t len;
|
|
|
|
if (to_posix)
|
|
{
|
|
src_delim = ';';
|
|
dst_delim = ':';
|
|
conv_fn = CCP_WIN_A_TO_POSIX | CCP_RELATIVE;
|
|
}
|
|
else
|
|
{
|
|
src_delim = ':';
|
|
dst_delim = ';';
|
|
conv_fn = CCP_POSIX_TO_WIN_A | CCP_RELATIVE;
|
|
}
|
|
|
|
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 (to_posix == ENV_CVT && len)
|
|
{
|
|
if (*srcpath == '"')
|
|
{
|
|
++srcpath;
|
|
*--s = '\0';
|
|
len -= 2;
|
|
}
|
|
while (len && s[-1] == '\\')
|
|
{
|
|
*--s = '\0';
|
|
--len;
|
|
}
|
|
}
|
|
if (len)
|
|
{
|
|
++d;
|
|
err = cygwin_conv_path (conv_fn, srcpath, d, size - (d - dst));
|
|
}
|
|
else if (!to_posix)
|
|
{
|
|
++d;
|
|
err = cygwin_conv_path (conv_fn, ".", d, size - (d - dst));
|
|
}
|
|
else
|
|
{
|
|
if (to_posix == 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. */
|
|
|
|
/* If TRUE create symlinks as Windows shortcuts, if false create symlinks
|
|
as normal files with magic number and system bit set. */
|
|
bool allow_winsymlinks = false;
|
|
|
|
extern "C" int
|
|
symlink (const char *oldpath, const char *newpath)
|
|
{
|
|
return symlink_worker (oldpath, newpath, allow_winsymlinks, false);
|
|
}
|
|
|
|
int
|
|
symlink_worker (const char *oldpath, const char *newpath, bool use_winsym,
|
|
bool isdevice)
|
|
{
|
|
int res = -1;
|
|
size_t len;
|
|
path_conv win32_newpath, win32_oldpath;
|
|
char *buf, *cp;
|
|
SECURITY_ATTRIBUTES sa = sec_none_nih;
|
|
OBJECT_ATTRIBUTES attr;
|
|
IO_STATUS_BLOCK io;
|
|
NTSTATUS status;
|
|
HANDLE fh;
|
|
tmp_pathbuf tp;
|
|
unsigned check_opt;
|
|
bool mk_winsym = use_winsym;
|
|
bool has_trailing_dirsep = false;
|
|
|
|
/* 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 */
|
|
myfault efault;
|
|
if (efault.faulted (EFAULT))
|
|
goto done;
|
|
if (!*oldpath || !*newpath)
|
|
{
|
|
set_errno (ENOENT);
|
|
goto done;
|
|
}
|
|
|
|
if (strlen (oldpath) > SYMLINK_MAX)
|
|
{
|
|
set_errno (ENAMETOOLONG);
|
|
goto done;
|
|
}
|
|
|
|
/* Trailing dirsep is a no-no. */
|
|
len = strlen (newpath);
|
|
has_trailing_dirsep = isdirsep (newpath[len - 1]);
|
|
if (has_trailing_dirsep)
|
|
{
|
|
newpath = strdup (newpath);
|
|
((char *) newpath)[len - 1] = '\0';
|
|
}
|
|
|
|
check_opt = PC_SYM_NOFOLLOW | PC_POSIX | (isdevice ? PC_NOWARN : 0);
|
|
/* We need the normalized full path below. */
|
|
win32_newpath.check (newpath, check_opt, stat_suffixes);
|
|
/* MVFS doesn't handle the SYSTEM DOS attribute, but it handles the R/O
|
|
attribute. Therefore we create symlinks on MVFS always as shortcuts. */
|
|
mk_winsym |= win32_newpath.fs_is_mvfs ();
|
|
|
|
if (mk_winsym && !win32_newpath.exists ()
|
|
&& (isdevice || !win32_newpath.fs_is_nfs ()))
|
|
{
|
|
char *newplnk = tp.c_get ();
|
|
stpcpy (stpcpy (newplnk, newpath), ".lnk");
|
|
win32_newpath.check (newplnk, check_opt);
|
|
}
|
|
|
|
if (win32_newpath.error)
|
|
{
|
|
set_errno (win32_newpath.error);
|
|
goto done;
|
|
}
|
|
|
|
syscall_printf ("symlink (%s, %S)", oldpath,
|
|
win32_newpath.get_nt_native_path ());
|
|
|
|
if ((!isdevice && win32_newpath.exists ())
|
|
|| win32_newpath.is_auto_device ())
|
|
{
|
|
set_errno (EEXIST);
|
|
goto done;
|
|
}
|
|
if (has_trailing_dirsep && !win32_newpath.exists ())
|
|
{
|
|
set_errno (ENOENT);
|
|
goto done;
|
|
}
|
|
|
|
if (!isdevice && win32_newpath.fs_is_nfs ())
|
|
{
|
|
/* On NFS, create symlinks by calling NtCreateFile with an EA of type
|
|
NfsSymlinkTargetName containing ... the symlink target name. */
|
|
PFILE_FULL_EA_INFORMATION pffei = (PFILE_FULL_EA_INFORMATION) tp.w_get ();
|
|
pffei->NextEntryOffset = 0;
|
|
pffei->Flags = 0;
|
|
pffei->EaNameLength = sizeof (NFS_SYML_TARGET) - 1;
|
|
char *EaValue = stpcpy (pffei->EaName, NFS_SYML_TARGET) + 1;
|
|
pffei->EaValueLength = sizeof (WCHAR) *
|
|
(sys_mbstowcs ((PWCHAR) EaValue, NT_MAX_PATH, oldpath) - 1);
|
|
status = NtCreateFile (&fh, FILE_WRITE_DATA | FILE_WRITE_EA | SYNCHRONIZE,
|
|
win32_newpath.get_object_attr (attr, sa),
|
|
&io, NULL, FILE_ATTRIBUTE_SYSTEM,
|
|
FILE_SHARE_VALID_FLAGS, FILE_CREATE,
|
|
FILE_SYNCHRONOUS_IO_NONALERT
|
|
| FILE_OPEN_FOR_BACKUP_INTENT,
|
|
pffei, NT_MAX_PATH * sizeof (WCHAR));
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
goto done;
|
|
}
|
|
NtClose (fh);
|
|
res = 0;
|
|
goto done;
|
|
}
|
|
|
|
if (mk_winsym)
|
|
{
|
|
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.normalized_path, '/')
|
|
- win32_newpath.normalized_path + 1;
|
|
char *absoldpath = tp.t_get ();
|
|
stpcpy (stpncpy (absoldpath, win32_newpath.normalized_path, len),
|
|
oldpath);
|
|
win32_oldpath.check (absoldpath, PC_SYM_NOFOLLOW, stat_suffixes);
|
|
}
|
|
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. */
|
|
WCHAR *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 MAX_PATH up to NT4, and to a length of 2000 bytes
|
|
since W2K. 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 = (char *) tp.w_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
|
|
{
|
|
/* Default technique creating a symlink. */
|
|
buf = (char *) tp.w_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);
|
|
}
|
|
|
|
if (isdevice && win32_newpath.exists ())
|
|
{
|
|
status = NtOpenFile (&fh, FILE_WRITE_ATTRIBUTES,
|
|
win32_newpath.get_object_attr (attr, sa),
|
|
&io, 0, FILE_OPEN_FOR_BACKUP_INTENT);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
goto done;
|
|
}
|
|
status = NtSetAttributesFile (fh, FILE_ATTRIBUTE_NORMAL);
|
|
NtClose (fh);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
goto done;
|
|
}
|
|
}
|
|
status = NtCreateFile (&fh, DELETE | FILE_GENERIC_WRITE,
|
|
win32_newpath.get_object_attr (attr, sa),
|
|
&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);
|
|
goto done;
|
|
}
|
|
if (win32_newpath.has_acls ())
|
|
set_file_attribute (fh, win32_newpath, ILLEGAL_UID, ILLEGAL_GID,
|
|
(io.Information == FILE_CREATED ? S_JUSTCREATED : 0)
|
|
| 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, mk_winsym ? FILE_ATTRIBUTE_READONLY
|
|
: FILE_ATTRIBUTE_SYSTEM);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("Setting attributes failed, status = %p", 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 = %p", status);
|
|
}
|
|
NtClose (fh);
|
|
|
|
done:
|
|
syscall_printf ("%d = symlink_worker (%s, %s, %d, %d)", res, oldpath,
|
|
newpath, mk_winsym, isdevice);
|
|
if (has_trailing_dirsep)
|
|
free ((void *) newpath);
|
|
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 <= 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 + 1)
|
|
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. */
|
|
pflags |= 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 %p", 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. */
|
|
pflags |= PATH_SYMLINK;
|
|
}
|
|
else if (io.Information == sizeof (cookie_buf)
|
|
&& memcmp (cookie_buf, SOCKET_COOKIE, sizeof (cookie_buf)) == 0)
|
|
pflags |= 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. */
|
|
pflags |= 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 (pflags & 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 + 1)
|
|
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;
|
|
}
|
|
|
|
int
|
|
symlink_info::check_reparse_point (HANDLE h)
|
|
{
|
|
tmp_pathbuf tp;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
PREPARSE_DATA_BUFFER rp = (PREPARSE_DATA_BUFFER) tp.c_get ();
|
|
UNICODE_STRING subst;
|
|
char srcbuf[SYMLINK_MAX + 7];
|
|
|
|
status = NtFsControlFile (h, NULL, NULL, NULL, &io, FSCTL_GET_REPARSE_POINT,
|
|
NULL, 0, (LPVOID) rp,
|
|
MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("NtFsControlFile(FSCTL_GET_REPARSE_POINT) failed, %p",
|
|
status);
|
|
set_error (EIO);
|
|
return 0;
|
|
}
|
|
if (rp->ReparseTag == IO_REPARSE_TAG_SYMLINK)
|
|
RtlInitCountedUnicodeString (&subst,
|
|
(WCHAR *)((char *)rp->SymbolicLinkReparseBuffer.PathBuffer
|
|
+ rp->SymbolicLinkReparseBuffer.SubstituteNameOffset),
|
|
rp->SymbolicLinkReparseBuffer.SubstituteNameLength);
|
|
else if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
|
|
{
|
|
RtlInitCountedUnicodeString (&subst,
|
|
(WCHAR *)((char *)rp->MountPointReparseBuffer.PathBuffer
|
|
+ rp->MountPointReparseBuffer.SubstituteNameOffset),
|
|
rp->MountPointReparseBuffer.SubstituteNameLength);
|
|
if (RtlEqualUnicodePathPrefix (&subst, &ro_u_volume, TRUE))
|
|
{
|
|
/* Volume mount point. Not treated as symlink. The return
|
|
value of -1 is a hint for the caller to treat this as a
|
|
volume mount point. */
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Maybe it's a reparse point, but it's certainly not one we
|
|
recognize. Drop the REPARSE file attribute so we don't even
|
|
try to use the flag for some special handling. It's just some
|
|
arbitrary file or directory for us. */
|
|
fileattr &= ~FILE_ATTRIBUTE_REPARSE_POINT;
|
|
return 0;
|
|
}
|
|
sys_wcstombs (srcbuf, SYMLINK_MAX + 7, subst.Buffer,
|
|
subst.Length / sizeof (WCHAR));
|
|
pflags |= PATH_SYMLINK | PATH_REP;
|
|
/* A symlink is never a directory. */
|
|
fileattr &= ~FILE_ATTRIBUTE_DIRECTORY;
|
|
return posixify (srcbuf);
|
|
}
|
|
|
|
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) - 1;
|
|
pflags |= 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 backslashe. 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;
|
|
public:
|
|
const char *path;
|
|
char *has (const char *, const suffix_info *);
|
|
int next ();
|
|
int lnk_match () {return nextstate >= SCAN_APPENDLNK;}
|
|
};
|
|
|
|
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:
|
|
/* Avoid attaching suffixes if the resulting filename would be invalid. */
|
|
if (eopath - fname > 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:
|
|
strcat (eopath, ".lnk");
|
|
nextstate = SCAN_DONE;
|
|
return 1;
|
|
default:
|
|
*eopath = '\0';
|
|
return 0;
|
|
}
|
|
|
|
while (suffixes && suffixes->name)
|
|
if (nextstate == SCAN_EXTRALNK && !suffixes->addon)
|
|
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 (!(pflags & PATH_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
|
|
|| (pflags & PATH_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;
|
|
pflags &= ~(PATH_SYMLINK | PATH_LNK | PATH_REP);
|
|
|
|
ext_here = suffix.has (path, suffixes);
|
|
extn = ext_here - path;
|
|
|
|
PVOID eabuf = &nfs_aol_ffei;
|
|
ULONG easize = sizeof nfs_aol_ffei;
|
|
|
|
bool had_ext = !!*ext_here;
|
|
while (suffix.next ())
|
|
{
|
|
bool no_ea = false;
|
|
|
|
error = 0;
|
|
get_nt_native_path (suffix.path, upath, pflags & PATH_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 ("%p = 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))
|
|
{
|
|
no_ea = true;
|
|
/* 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 ("%p = NtOpenFile (no-EAs %S)", status, &upath);
|
|
}
|
|
if (status == STATUS_OBJECT_NAME_NOT_FOUND)
|
|
{
|
|
if (ci_flag == 0 && wincap.has_broken_udf ()
|
|
&& (!fs.inited () || fs.is_udf ()))
|
|
{
|
|
/* On NT 5.x UDF is broken (at least) in terms of case
|
|
sensitivity. When trying to open a file case sensitive,
|
|
the file appears to be non-existant. Another bug is
|
|
described in fs_info::update. */
|
|
attr.Attributes = OBJ_CASE_INSENSITIVE;
|
|
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 ("%p = NtOpenFile (broken-UDF, %S)", status, &upath);
|
|
attr.Attributes = 0;
|
|
if (NT_SUCCESS (status))
|
|
{
|
|
if (!fs.inited ())
|
|
fs.update (&upath, h);
|
|
if (!fs.is_udf ())
|
|
{
|
|
NtClose (h);
|
|
h = NULL;
|
|
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 *and* the above special case for UDF
|
|
on XP didn't succeeed. */
|
|
if (!restarted && !*ext_here && !(pflags & PATH_DOS) && !fs.inited ())
|
|
{
|
|
/* Check for trailing dot or space or leading space in
|
|
last component. */
|
|
char *p = ext_here - 1;
|
|
if (*p != '.' && *p != ' ')
|
|
{
|
|
while (*--p != '\\')
|
|
;
|
|
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. */
|
|
if (!fs.inited ())
|
|
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. */
|
|
pflags |= PATH_DOS;
|
|
restarted = true;
|
|
goto restart;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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)))
|
|
{
|
|
if (fs.is_nfs ())
|
|
{
|
|
status = nfs_fetch_fattr3 (h, conv_hdl.nfsattr ());
|
|
if (NT_SUCCESS (status))
|
|
fileattr = ((conv_hdl.nfsattr ()->type & 7) == NF3DIR)
|
|
? FILE_ATTRIBUTE_DIRECTORY : 0;
|
|
}
|
|
else
|
|
{
|
|
PFILE_NETWORK_OPEN_INFORMATION pfnoi = conv_hdl.fnoi ();
|
|
|
|
/* Netapps don't implement FileNetworkOpenInformation. */
|
|
status = fs.is_netapp ()
|
|
? STATUS_INVALID_PARAMETER
|
|
: NtQueryInformationFile (h, &io, pfnoi, sizeof *pfnoi,
|
|
FileNetworkOpenInformation);
|
|
if (status == STATUS_INVALID_PARAMETER
|
|
|| status == STATUS_NOT_IMPLEMENTED)
|
|
{
|
|
/* Apart from accessing Netapps, this also occurs when
|
|
accessing SMB share root dirs hosted on NT4
|
|
(STATUS_INVALID_PARAMETER), or when trying to access
|
|
SMB share root dirs from NT4 (STATUS_NOT_IMPLEMENTED). */
|
|
FILE_BASIC_INFORMATION fbi;
|
|
FILE_STANDARD_INFORMATION fsi;
|
|
|
|
status = NtQueryInformationFile (h, &io, &fbi, sizeof fbi,
|
|
FileBasicInformation);
|
|
if (NT_SUCCESS (status))
|
|
{
|
|
memcpy (pfnoi, &fbi, 4 * sizeof (LARGE_INTEGER));
|
|
if (NT_SUCCESS (NtQueryInformationFile (h, &io, &fsi,
|
|
sizeof fsi,
|
|
FileStandardInformation)))
|
|
{
|
|
pfnoi->EndOfFile.QuadPart = fsi.EndOfFile.QuadPart;
|
|
pfnoi->AllocationSize.QuadPart
|
|
= fsi.AllocationSize.QuadPart;
|
|
}
|
|
else
|
|
pfnoi->EndOfFile.QuadPart
|
|
= pfnoi->AllocationSize.QuadPart = 0;
|
|
pfnoi->FileAttributes = fbi.FileAttributes;
|
|
}
|
|
}
|
|
if (NT_SUCCESS (status))
|
|
fileattr = pfnoi->FileAttributes;
|
|
}
|
|
}
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("%p = 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.
|
|
|
|
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_OBJECT_NAME_INVALID
|
|
|| status == STATUS_BAD_NETWORK_PATH
|
|
|| status == STATUS_BAD_NETWORK_NAME
|
|
|| status == STATUS_NO_MEDIA_IN_DEVICE)
|
|
{
|
|
set_error (ENOENT);
|
|
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_BOTH_DIRECTORY_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 ("%p = 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. */
|
|
fileattr = basename.Length ? 0 : FILE_ATTRIBUTE_DIRECTORY;
|
|
}
|
|
else
|
|
{
|
|
status = NtQueryDirectoryFile (dir, NULL, NULL, NULL, &io,
|
|
&fdi_buf, sizeof fdi_buf,
|
|
FileBothDirectoryInformation,
|
|
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 ("%p = 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_NETWORK_OPEN_INFORMATION pfnoi = conv_hdl.fnoi ();
|
|
|
|
fileattr = fdi_buf.fdi.FileAttributes;
|
|
memcpy (pfnoi, &fdi_buf.fdi.CreationTime, sizeof *pfnoi);
|
|
/* Amazing, but true: The FILE_NETWORK_OPEN_INFORMATION
|
|
structure has the AllocationSize and EndOfFile members
|
|
interchanged relative to the directory information
|
|
classes. */
|
|
pfnoi->AllocationSize.QuadPart
|
|
= fdi_buf.fdi.AllocationSize.QuadPart;
|
|
pfnoi->EndOfFile.QuadPart
|
|
= fdi_buf.fdi.EndOfFile.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))
|
|
{
|
|
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.
|
|
For instance, Vista starts to create a couple of reparse points
|
|
with SYSTEM and HIDDEN flags set. */
|
|
if ((fileattr & FILE_ATTRIBUTE_REPARSE_POINT))
|
|
{
|
|
/* Don't check reparse points on remote filesystems. A reparse point
|
|
pointing to another file on the remote system will be mistreated
|
|
as pointing to a local file on the local system. This breaks the
|
|
way reparse points are transparently handled on remote systems. */
|
|
if (fs.is_remote_drive())
|
|
res = 0;
|
|
else
|
|
res = check_reparse_point (h);
|
|
if (res == -1)
|
|
{
|
|
/* 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. */
|
|
fs.update (&upath, NULL);
|
|
/* 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. */
|
|
pflags &= ~PC_KEEP_HANDLE;
|
|
}
|
|
else if (res)
|
|
{
|
|
/* A symlink is never a directory. */
|
|
conv_hdl.fnoi ()->FileAttributes &= ~FILE_ATTRIBUTE_DIRECTORY;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* Normal file. */
|
|
file_not_symlink:
|
|
issymlink = false;
|
|
syscall_printf ("%s", isdevice ? "is a device" : "not a symlink");
|
|
res = 0;
|
|
break;
|
|
}
|
|
|
|
if (h)
|
|
{
|
|
if (pflags & PC_KEEP_HANDLE)
|
|
conv_hdl.set (h);
|
|
else
|
|
NtClose (h);
|
|
}
|
|
|
|
syscall_printf ("%d = symlink.check (%s, %p) (%p)",
|
|
res, suffix.path, contents, pflags);
|
|
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);
|
|
pflags = 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 *path, char *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, %d)", path, buf, buflen);
|
|
return -1;
|
|
}
|
|
|
|
if (!pathbuf.exists ())
|
|
{
|
|
set_errno (ENOENT);
|
|
return -1;
|
|
}
|
|
|
|
if (!pathbuf.issymlink ())
|
|
{
|
|
if (pathbuf.exists ())
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
ssize_t len = min (buflen, strlen (pathbuf.get_win32 ()));
|
|
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 */
|
|
__ino64_t __stdcall
|
|
hash_path_name (__ino64_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;
|
|
}
|
|
|
|
__ino64_t __stdcall
|
|
hash_path_name (__ino64_t hash, PCWSTR name)
|
|
{
|
|
UNICODE_STRING uname;
|
|
RtlInitUnicodeString (&uname, name);
|
|
return hash_path_name (hash, &uname);
|
|
}
|
|
|
|
__ino64_t __stdcall
|
|
hash_path_name (__ino64_t hash, const char *name)
|
|
{
|
|
UNICODE_STRING uname;
|
|
RtlCreateUnicodeStringFromAsciiz (&uname, name);
|
|
__ino64_t ret = hash_path_name (hash, &uname);
|
|
RtlFreeUnicodeString (&uname);
|
|
return ret;
|
|
}
|
|
|
|
extern "C" char *
|
|
getcwd (char *buf, size_t ulen)
|
|
{
|
|
char* res = NULL;
|
|
myfault efault;
|
|
if (efault.faulted (EFAULT))
|
|
/* errno set */;
|
|
else if (ulen == 0 && buf)
|
|
set_errno (EINVAL);
|
|
else
|
|
res = cygheap->cwd.get (buf, 1, 1, ulen);
|
|
return res;
|
|
}
|
|
|
|
/* getwd: Legacy. */
|
|
extern "C" char *
|
|
getwd (char *buf)
|
|
{
|
|
return getcwd (buf, PATH_MAX + 1); /*Per SuSv3!*/
|
|
}
|
|
|
|
/* chdir: POSIX 5.2.1.1 */
|
|
extern "C" int
|
|
chdir (const char *in_dir)
|
|
{
|
|
myfault efault;
|
|
if (efault.faulted (EFAULT))
|
|
return -1;
|
|
if (!*in_dir)
|
|
{
|
|
set_errno (ENOENT);
|
|
return -1;
|
|
}
|
|
|
|
syscall_printf ("dir '%s'", in_dir);
|
|
|
|
/* Convert path. First argument ensures that we don't check for NULL/empty/invalid
|
|
again. */
|
|
path_conv path (PC_NONULLEMPTY, in_dir, PC_SYM_FOLLOW | PC_POSIX);
|
|
if (path.error)
|
|
{
|
|
set_errno (path.error);
|
|
syscall_printf ("-1 = chdir (%s)", in_dir);
|
|
return -1;
|
|
}
|
|
|
|
int res = -1;
|
|
const char *posix_cwd = NULL;
|
|
int devn = path.get_devn ();
|
|
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.normalized_path.
|
|
In other cases we let cwd.set obtain the Posix path through
|
|
the mount table. */
|
|
if (!isdrive(path.normalized_path))
|
|
posix_cwd = path.normalized_path;
|
|
res = 0;
|
|
}
|
|
else
|
|
{
|
|
posix_cwd = path.normalized_path;
|
|
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 ("%d = chdir() cygheap->cwd.posix '%s' native '%S'", res,
|
|
cygheap->cwd.get_posix (), path.get_nt_native_path ());
|
|
MALLOC_CHECK;
|
|
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 ("%d = 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;
|
|
myfault efault;
|
|
if (efault.faulted (EFAULT))
|
|
return -1;
|
|
|
|
path_conv p;
|
|
size_t lsiz = 0;
|
|
char *buf = NULL;
|
|
PWCHAR path = NULL;
|
|
int error = 0;
|
|
bool relative = !!(what & CCP_RELATIVE);
|
|
what &= ~CCP_RELATIVE;
|
|
|
|
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 | PC_NOWARN | (relative ? PC_NOFULL : 0));
|
|
if (p.error)
|
|
return_with_errno (p.error);
|
|
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 = stpcpy (buf, "\\\\.\\GLOBALROOT");
|
|
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 (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 | PC_NOWARN | (relative ? PC_NOFULL : 0));
|
|
if (p.error)
|
|
return_with_errno (p.error);
|
|
/* Relative Windows paths are always restricted to MAX_PATH chars. */
|
|
if (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 | PC_NOWARN);
|
|
if (p.error)
|
|
return_with_errno (p.error);
|
|
}
|
|
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, L"\\\\.\\GLOBALROOT");
|
|
lsiz += sizeof ("\\\\.\\GLOBALROOT") - 1;
|
|
}
|
|
/* TODO: Same ".\\" band-aid as in CCP_POSIX_TO_WIN_A case. */
|
|
if (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,
|
|
relative);
|
|
if (error)
|
|
return_with_errno (error);
|
|
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,
|
|
relative);
|
|
if (error)
|
|
return_with_errno (error);
|
|
lsiz = strlen (buf) + 1;
|
|
break;
|
|
default:
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
if (!size)
|
|
return lsiz;
|
|
if (size < lsiz)
|
|
{
|
|
set_errno (ENOSPC);
|
|
return -1;
|
|
}
|
|
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;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
/* The realpath function is required by POSIX:2008. */
|
|
|
|
extern "C" char *
|
|
realpath (const char *path, char *resolved)
|
|
{
|
|
/* 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. */
|
|
tmp_pathbuf tp;
|
|
myfault efault;
|
|
if (efault.faulted (EFAULT))
|
|
return NULL;
|
|
|
|
char *tpath;
|
|
if (isdrive (path))
|
|
{
|
|
tpath = tp.c_get ();
|
|
mount_table->cygdrive_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.normalized_path) + 1);
|
|
if (!resolved)
|
|
return NULL;
|
|
}
|
|
strcpy (resolved, real_path.normalized_path);
|
|
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);
|
|
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.normalized_path : pc.get_win32 ()))
|
|
+ 100;
|
|
|
|
return size;
|
|
}
|
|
|
|
|
|
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" 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));
|
|
}
|
|
|
|
extern "C" int
|
|
cygwin_win32_to_posix_path_list (const char *win32, char *posix)
|
|
{
|
|
return_with_errno (conv_path_list (win32, posix, MAX_PATH, 1));
|
|
}
|
|
|
|
extern "C" int
|
|
cygwin_posix_to_win32_path_list (const char *posix, char *win32)
|
|
{
|
|
return_with_errno (conv_path_list (posix, win32, MAX_PATH, 0));
|
|
}
|
|
|
|
extern "C" ssize_t
|
|
cygwin_conv_path_list (cygwin_conv_path_t what, const void *from, void *to,
|
|
size_t size)
|
|
{
|
|
/* FIXME: Path lists are (so far) always retaining relative paths. */
|
|
what &= ~CCP_RELATIVE;
|
|
switch (what)
|
|
{
|
|
case CCP_WIN_W_TO_POSIX:
|
|
case CCP_POSIX_TO_WIN_W:
|
|
/*FIXME*/
|
|
api_fatal ("wide char path lists not yet supported");
|
|
break;
|
|
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);
|
|
return_with_errno (conv_path_list ((const char *) from, (char *) to,
|
|
size, what == CCP_WIN_A_TO_POSIX));
|
|
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;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|
|
/* The find_fast_cwd_pointers 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. */
|
|
|
|
/* This structure is used to store the CWD starting with Windows Vista.
|
|
The CWD storage in the RTL_USER_PROCESS_PARAMETERS block is only
|
|
an afterthought now. The actual CWD storage is a FAST_CWD structure
|
|
which is allocated on the process heap. The new method only requires
|
|
minimal locking and it's much more multi-thread friendly. Presumably
|
|
it minimizes contention when accessing the CWD. */
|
|
typedef struct _FAST_CWD {
|
|
UNICODE_STRING Path; /* Path's Buffer member always refers
|
|
to the following Buffer array. */
|
|
HANDLE DirectoryHandle;
|
|
LONG FSCharacteristics; /* Taken from FileFsDeviceInformation */
|
|
LONG ReferenceCount; /* Only release when this is 0. */
|
|
ULONG OldDismountCount; /* Reflects the system DismountCount
|
|
at the time the CWD has been set. */
|
|
WCHAR Buffer[MAX_PATH];
|
|
} FAST_CWD, *PFAST_CWD;
|
|
|
|
/* This is the old FAST_CWD structure up to the patch from KB 2393802,
|
|
release in February 2011. Hopefully it's not used for long anymore,
|
|
but for quite some time we can't rely on this fact. */
|
|
typedef struct _FAST_CWD_OLD {
|
|
LONG ReferenceCount; /* Only release when this is 0. */
|
|
HANDLE DirectoryHandle;
|
|
ULONG OldDismountCount; /* Reflects the system DismountCount
|
|
at the time the CWD has been set. */
|
|
UNICODE_STRING Path; /* Path's Buffer member always refers
|
|
to the following Buffer array. */
|
|
WCHAR Buffer[MAX_PATH];
|
|
} FAST_CWD_OLD, *PFAST_CWD_OLD;
|
|
|
|
/* fast_cwd_ptr is a pointer to the global pointer in ntdll.dll pointing
|
|
to the FAST_CWD structure which constitutes the CWD.
|
|
|
|
We put the pointer into the common shared DLL segment. This allows to
|
|
restrict the call to find_fast_cwd_pointers() to once per Cygwin session
|
|
per user session. This works, because ASLR randomizes the load address
|
|
of DLLs only once at boot time. */
|
|
static PFAST_CWD *fast_cwd_ptr
|
|
__attribute__((section (".cygwin_dll_common"), shared)) = (PFAST_CWD *) -1;
|
|
|
|
/* This is the mapping of the KUSER_SHARED_DATA structure into the 32 bit
|
|
user address space. We need it here to access the current DismountCount. */
|
|
static KUSER_SHARED_DATA &SharedUserData
|
|
= *(volatile PKUSER_SHARED_DATA) 0x7ffe0000;
|
|
|
|
#define peek32(x) (*(uint32_t *)(x))
|
|
|
|
/* This function scans the code in ntdll.dll to find the address of the
|
|
global variable used to access the CWD starting with Vista. 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.
|
|
|
|
This code has been tested on Vista 32/64 bit, Server 2008 32/64 bit,
|
|
Windows 7 32/64 bit, and Server 2008 R2 (which is only 64 bit anyway).
|
|
There's some hope that this will still work for Windows 8... */
|
|
static void
|
|
find_fast_cwd_pointers ()
|
|
{
|
|
/* Note that we have been called. */
|
|
fast_cwd_ptr = NULL;
|
|
/* Fetch entry points of relevant functions in ntdll.dll. */
|
|
HMODULE ntdll = GetModuleHandle ("ntdll.dll");
|
|
if (!ntdll)
|
|
return;
|
|
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;
|
|
/* Search first relative call instruction in RtlGetCurrentDirectory_U. */
|
|
const uint8_t *rcall = (const uint8_t *) memchr (get_dir, 0xe8, 32);
|
|
if (!rcall)
|
|
return;
|
|
/* 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);
|
|
/* ...which should be followed by "mov edi, crit-sect-addr" then
|
|
"push edi". */
|
|
const uint8_t *movedi = pushedi + 1;
|
|
if (movedi[0] != 0xbf || movedi[5] != 0x57)
|
|
return;
|
|
/* 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;
|
|
/* To check we are seeing the right code, we check our expectation that
|
|
the next instruction is a relative call into RtlEnterCriticalSection. */
|
|
rcall = movedi + 6;
|
|
if (rcall[0] != 0xe8)
|
|
return;
|
|
/* Check that this is a relative call to RtlEnterCriticalSection. */
|
|
offset = (ptrdiff_t) peek32 (rcall + 1);
|
|
if (rcall + 5 + offset != ent_crit)
|
|
return;
|
|
/* After locking the critical section, the code should read the global
|
|
PFAST_CWD * pointer that is guarded by that critical section. */
|
|
const uint8_t *movesi = rcall + 5;
|
|
if (movesi[0] != 0x8b)
|
|
return;
|
|
fast_cwd_ptr = (PFAST_CWD *) peek32 (movesi + 2);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
void
|
|
cwdstuff::override_win32_cwd (bool init, ULONG old_dismount_count)
|
|
{
|
|
NTSTATUS status;
|
|
HANDLE h = NULL;
|
|
|
|
PEB &peb = *NtCurrentTeb ()->Peb;
|
|
UNICODE_STRING &upp_cwd_str = peb.ProcessParameters->CurrentDirectoryName;
|
|
HANDLE &upp_cwd_hdl = peb.ProcessParameters->CurrentDirectoryHandle;
|
|
|
|
if (wincap.has_fast_cwd ())
|
|
{
|
|
if (fast_cwd_ptr == (PFAST_CWD *) -1)
|
|
{
|
|
find_fast_cwd_pointers ();
|
|
if (!fast_cwd_ptr)
|
|
system_printf ("WARNING: Couldn't compute FAST_CWD pointer. "
|
|
"Please report this problem to\nthe public mailing "
|
|
"list cygwin@cygwin.com");
|
|
}
|
|
if (fast_cwd_ptr)
|
|
{
|
|
/* Default method starting with Vista. If we got a valid value for
|
|
fast_cwd_ptr, we can simply replace the RtlSetCurrentDirectory_U
|
|
function entirely, just as on pre-Vista. */
|
|
PVOID heap = peb.ProcessHeap;
|
|
/* First allocate a new FAST_CWD structure on the heap.
|
|
The new FAST_CWD structure is 4 byte bigger than the old one,
|
|
but we simply don't care, so we allocate always room for the
|
|
new one. */
|
|
PFAST_CWD f_cwd = (PFAST_CWD)
|
|
RtlAllocateHeap (heap, 0, sizeof (FAST_CWD));
|
|
if (!f_cwd)
|
|
{
|
|
debug_printf ("RtlAllocateHeap failed");
|
|
return;
|
|
}
|
|
/* Fill in the values. Fortunately it's simple to check for the
|
|
new structure. Path.MaximumLength takes the same space as the
|
|
high word of the old ReferenceCount. We know that MaximumLength
|
|
is always MAX_PATH. For the ref count this would account for a
|
|
pratically impossible value between 34078720 and 34079240. */
|
|
if ((*fast_cwd_ptr)->Path.MaximumLength == MAX_PATH * sizeof (WCHAR))
|
|
{
|
|
/* New FAST_CWD structure. */
|
|
IO_STATUS_BLOCK io;
|
|
FILE_FS_DEVICE_INFORMATION ffdi;
|
|
|
|
RtlInitEmptyUnicodeString (&f_cwd->Path, f_cwd->Buffer,
|
|
MAX_PATH * sizeof (WCHAR));
|
|
f_cwd->DirectoryHandle = dir;
|
|
/* 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. */
|
|
f_cwd->FSCharacteristics =
|
|
(!error
|
|
&& NT_SUCCESS (NtQueryVolumeInformationFile (dir, &io, &ffdi,
|
|
sizeof ffdi, FileFsDeviceInformation)))
|
|
? ffdi.Characteristics : 0;
|
|
f_cwd->ReferenceCount = 1;
|
|
f_cwd->OldDismountCount = old_dismount_count;
|
|
copy_cwd_str (&f_cwd->Path, error ? &ro_u_pipedir : &win32);
|
|
/* 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);
|
|
PFAST_CWD old_cwd = *fast_cwd_ptr;
|
|
*fast_cwd_ptr = f_cwd;
|
|
upp_cwd_str = f_cwd->Path;
|
|
upp_cwd_hdl = dir;
|
|
RtlLeaveCriticalSection (peb.FastPebLock);
|
|
/* Decrement the reference count. If it's down to 0, free
|
|
structure from heap. */
|
|
if (InterlockedDecrement (&old_cwd->ReferenceCount) == 0)
|
|
{
|
|
/* In contrast to pre-Vista, the handle on init is always a
|
|
fresh one and not the handle inherited from the parent
|
|
process. So we always have to close it here. However, the
|
|
handle could be NULL, if we cd'ed into a virtual dir. */
|
|
if (old_cwd->DirectoryHandle)
|
|
NtClose (old_cwd->DirectoryHandle);
|
|
RtlFreeHeap (heap, 0, old_cwd);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Old FAST_CWD structure. Otherwise same procedure as above,
|
|
except for the non-existant FSCharacteristics member. */
|
|
PFAST_CWD_OLD f_cwd_old = (PFAST_CWD_OLD) f_cwd;
|
|
f_cwd_old->ReferenceCount = 1;
|
|
f_cwd_old->DirectoryHandle = dir;
|
|
f_cwd_old->OldDismountCount = old_dismount_count;
|
|
RtlInitEmptyUnicodeString (&f_cwd_old->Path, f_cwd_old->Buffer,
|
|
MAX_PATH * sizeof (WCHAR));
|
|
copy_cwd_str (&f_cwd_old->Path, error ? &ro_u_pipedir : &win32);
|
|
RtlEnterCriticalSection (peb.FastPebLock);
|
|
PFAST_CWD_OLD old_cwd = (PFAST_CWD_OLD) *fast_cwd_ptr;
|
|
*fast_cwd_ptr = (PFAST_CWD) f_cwd_old;
|
|
upp_cwd_str = f_cwd_old->Path;
|
|
upp_cwd_hdl = dir;
|
|
RtlLeaveCriticalSection (peb.FastPebLock);
|
|
if (InterlockedDecrement (&old_cwd->ReferenceCount) == 0)
|
|
{
|
|
if (old_cwd->DirectoryHandle)
|
|
NtClose (old_cwd->DirectoryHandle);
|
|
RtlFreeHeap (heap, 0, old_cwd);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* This is more a hack, and it's only used on Vista and later if we
|
|
failed to find the fast_cwd_ptr value. What we do here is to call
|
|
RtlSetCurrentDirectory_U and let it set up a new FAST_CWD
|
|
structure. Afterwards, compute the address of that structure
|
|
utilizing the fact that the buffer address in the user process
|
|
parameter block is actually pointing to the buffer in that
|
|
FAST_CWD structure. Then replace the directory handle in that
|
|
structure with our own handle and close the original one.
|
|
|
|
Note that the call to RtlSetCurrentDirectory_U also closes our
|
|
old dir handle, so there won't be any handle left open.
|
|
|
|
This method is prone to two race conditions:
|
|
|
|
- Due to the way RtlSetCurrentDirectory_U opens the directory
|
|
handle, the directory is locked against deletion or renaming
|
|
between the RtlSetCurrentDirectory_U and the subsequent NtClose
|
|
call.
|
|
|
|
- When another thread calls SetCurrentDirectory at exactly the
|
|
same time, a crash might occur, or worse, unrelated data could
|
|
be overwritten or NtClose could be called on an unrelated handle.
|
|
|
|
Therefore, use this *only* as a fallback. */
|
|
if (!init)
|
|
{
|
|
status = RtlSetCurrentDirectory_U (error ? &ro_u_pipedir
|
|
: &win32);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("RtlSetCurrentDirectory_U(%S) failed, %p",
|
|
error ? &ro_u_pipedir : &win32, status);
|
|
return;
|
|
}
|
|
}
|
|
RtlEnterCriticalSection (peb.FastPebLock);
|
|
PFAST_CWD f_cwd = (PFAST_CWD)
|
|
((PBYTE) upp_cwd_str.Buffer
|
|
- __builtin_offsetof (struct _FAST_CWD, Buffer));
|
|
if (f_cwd->Path.MaximumLength == MAX_PATH * sizeof (WCHAR))
|
|
f_cwd->DirectoryHandle = dir;
|
|
else
|
|
((PFAST_CWD_OLD) f_cwd)->DirectoryHandle = dir;
|
|
h = upp_cwd_hdl;
|
|
upp_cwd_hdl = dir;
|
|
RtlLeaveCriticalSection (peb.FastPebLock);
|
|
/* In contrast to pre-Vista, the handle on init is always a fresh one
|
|
and not the handle inherited from the parent process. So we always
|
|
have to close it here. */
|
|
NtClose (h);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* This method is used for all pre-Vista OSes. We simply set the values
|
|
for the CWD in the user process parameter block entirely by ourselves
|
|
under PEB lock condition. This is how RtlSetCurrentDirectory_U worked
|
|
in these older OSes, so we're safe.
|
|
|
|
Note that we can't just RtlEnterCriticalSection (peb.FastPebLock)
|
|
on pre-Vista. RtlAcquirePebLock was way more complicated back then. */
|
|
RtlAcquirePebLock ();
|
|
if (!init)
|
|
copy_cwd_str (&upp_cwd_str, error ? &ro_u_pipedir : &win32);
|
|
h = upp_cwd_hdl;
|
|
upp_cwd_hdl = dir;
|
|
RtlReleasePebLock ();
|
|
/* Only on init, the handle is potentially a native handle. However,
|
|
if it's identical to dir, it's the inherited handle from a Cygwin
|
|
parent process and must not be closed. */
|
|
if (h && h != dir)
|
|
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
|
|
/* 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;
|
|
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.
|
|
|
|
Unfortunately, even though we have access to the Win32 process parameter
|
|
block, we can't just replace the directory handle. Starting with Vista,
|
|
the handle is used elsewhere, and just replacing the handle in the process
|
|
parameter block shows quite surprising results.
|
|
FIXME: If we ever find a *safe* way to replace the directory handle in
|
|
the process parameter block, we're back in business.
|
|
|
|
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;
|
|
}
|
|
|
|
/* Memorize old DismountCount before opening the dir. This value is
|
|
stored in the FAST_CWD structure on Vista and later. 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;
|
|
OBJECT_ATTRIBUTES attr;
|
|
|
|
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. */
|
|
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))
|
|
{
|
|
cwd_lock.release ();
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
}
|
|
/* 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. */
|
|
;
|
|
else
|
|
{
|
|
/* Compute length on Win32 path. */
|
|
size_t len = upath.Length / sizeof (WCHAR) - 4;
|
|
if (RtlEqualUnicodePathPrefix (&upath, &ro_u_uncp, TRUE))
|
|
{
|
|
len -= 2;
|
|
unc_path = true;
|
|
}
|
|
/* Convert to a Win32 path. */
|
|
upath.Buffer += upath.Length / sizeof (WCHAR) - len;
|
|
upath.Length = len * sizeof (WCHAR);
|
|
|
|
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)
|
|
{
|
|
MALLOC_CHECK;
|
|
|
|
tmp_pathbuf tp;
|
|
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, %d, %d, %d), errno %d",
|
|
buf, buf, ulen, need_posix, with_chroot, errno);
|
|
MALLOC_CHECK;
|
|
return buf;
|
|
}
|
|
|
|
int etc::curr_ix = 0;
|
|
/* Note that the first elements of the below arrays are unused */
|
|
bool etc::change_possible[MAX_ETC_FILES + 1];
|
|
OBJECT_ATTRIBUTES etc::fn[MAX_ETC_FILES + 1];
|
|
LARGE_INTEGER etc::last_modified[MAX_ETC_FILES + 1];
|
|
|
|
int
|
|
etc::init (int n, POBJECT_ATTRIBUTES attr)
|
|
{
|
|
if (n > 0)
|
|
/* ok */;
|
|
else if (++curr_ix <= MAX_ETC_FILES)
|
|
n = curr_ix;
|
|
else
|
|
api_fatal ("internal error");
|
|
|
|
fn[n] = *attr;
|
|
change_possible[n] = false;
|
|
test_file_change (n);
|
|
paranoid_printf ("fn[%d] %S, curr_ix %d", n, fn[n].ObjectName, curr_ix);
|
|
return n;
|
|
}
|
|
|
|
bool
|
|
etc::test_file_change (int n)
|
|
{
|
|
NTSTATUS status;
|
|
FILE_NETWORK_OPEN_INFORMATION fnoi;
|
|
bool res;
|
|
|
|
status = NtQueryFullAttributesFile (&fn[n], &fnoi);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
res = true;
|
|
memset (last_modified + n, 0, sizeof (last_modified[n]));
|
|
debug_printf ("NtQueryFullAttributesFile (%S) failed, %p",
|
|
fn[n].ObjectName, status);
|
|
}
|
|
else
|
|
{
|
|
res = CompareFileTime ((FILETIME *) &fnoi.LastWriteTime,
|
|
(FILETIME *) last_modified + n) > 0;
|
|
last_modified[n].QuadPart = fnoi.LastWriteTime.QuadPart;
|
|
}
|
|
|
|
paranoid_printf ("fn[%d] %S res %d", n, fn[n].ObjectName, res);
|
|
return res;
|
|
}
|
|
|
|
bool
|
|
etc::dir_changed (int n)
|
|
{
|
|
if (!change_possible[n])
|
|
{
|
|
static HANDLE changed_h NO_COPY;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
|
|
if (!changed_h)
|
|
{
|
|
OBJECT_ATTRIBUTES attr;
|
|
|
|
path_conv dir ("/etc");
|
|
status = NtOpenFile (&changed_h, SYNCHRONIZE | FILE_LIST_DIRECTORY,
|
|
dir.get_object_attr (attr, sec_none_nih), &io,
|
|
FILE_SHARE_VALID_FLAGS, FILE_DIRECTORY_FILE);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
#ifdef DEBUGGING
|
|
system_printf ("NtOpenFile (%S) failed, %p",
|
|
dir.get_nt_native_path (), status);
|
|
#endif
|
|
changed_h = INVALID_HANDLE_VALUE;
|
|
}
|
|
else
|
|
{
|
|
status = NtNotifyChangeDirectoryFile (changed_h, NULL, NULL,
|
|
NULL, &io, NULL, 0,
|
|
FILE_NOTIFY_CHANGE_LAST_WRITE
|
|
| FILE_NOTIFY_CHANGE_FILE_NAME,
|
|
FALSE);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
#ifdef DEBUGGING
|
|
system_printf ("NtNotifyChangeDirectoryFile (1) failed, %p",
|
|
status);
|
|
#endif
|
|
NtClose (changed_h);
|
|
changed_h = INVALID_HANDLE_VALUE;
|
|
}
|
|
}
|
|
memset (change_possible, true, sizeof (change_possible));
|
|
}
|
|
|
|
if (changed_h == INVALID_HANDLE_VALUE)
|
|
change_possible[n] = true;
|
|
else if (WaitForSingleObject (changed_h, 0) == WAIT_OBJECT_0)
|
|
{
|
|
status = NtNotifyChangeDirectoryFile (changed_h, NULL, NULL,
|
|
NULL, &io, NULL, 0,
|
|
FILE_NOTIFY_CHANGE_LAST_WRITE
|
|
| FILE_NOTIFY_CHANGE_FILE_NAME,
|
|
FALSE);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
#ifdef DEBUGGING
|
|
system_printf ("NtNotifyChangeDirectoryFile (2) failed, %p",
|
|
status);
|
|
#endif
|
|
NtClose (changed_h);
|
|
changed_h = INVALID_HANDLE_VALUE;
|
|
}
|
|
memset (change_possible, true, sizeof change_possible);
|
|
}
|
|
}
|
|
|
|
paranoid_printf ("fn[%d] %S change_possible %d",
|
|
n, fn[n].ObjectName, change_possible[n]);
|
|
return change_possible[n];
|
|
}
|
|
|
|
bool
|
|
etc::file_changed (int n)
|
|
{
|
|
bool res = false;
|
|
if (dir_changed (n) && test_file_change (n))
|
|
res = true;
|
|
change_possible[n] = false; /* Change is no longer possible */
|
|
paranoid_printf ("fn[%d] %S res %d", n, fn[n].ObjectName, res);
|
|
return res;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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;
|
|
}
|