/* fhandler_disk_file.cc Copyright 1996, 1997, 1998, 1999, 2000, 2001 Red Hat, Inc. This file is part of Cygwin. This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ #include "winsup.h" #include #include #include #include #include #include #include "cygerrno.h" #include "perprocess.h" #include "security.h" #include "cygwin/version.h" #include "fhandler.h" #include "path.h" #include "dtable.h" #include "cygheap.h" #include "shared_info.h" #include "sigproc.h" #include "pinfo.h" #include #define _COMPILING_NEWLIB #include static int num_entries (const char *win32_name) { WIN32_FIND_DATA buf; HANDLE handle; char buf1[MAX_PATH]; int count = 0; strcpy (buf1, win32_name); int len = strlen (buf1); if (len == 0 || isdirsep (buf1[len - 1])) strcat (buf1, "*"); else strcat (buf1, "/*"); /* */ handle = FindFirstFileA (buf1, &buf); if (handle == INVALID_HANDLE_VALUE) return 0; count ++; while (FindNextFileA (handle, &buf)) { if ((buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) count ++; } FindClose (handle); return count; } int fhandler_disk_file::fstat (struct stat *buf, path_conv *pc) { int res = -1; int oret; uid_t uid; gid_t gid; int open_flags = O_RDONLY | O_BINARY | O_DIROPEN; if (!pc) return fstat_helper (buf); if ((oret = open (pc, open_flags, 0))) /* ok */; else { int ntsec_atts = 0; /* If we couldn't open the file, try a "query open" with no permissions. This will allow us to determine *some* things about the file, at least. */ set_query_open (TRUE); if ((oret = open (pc, open_flags, 0))) /* ok */; else if (allow_ntsec && pc->has_acls () && get_errno () == EACCES && !get_file_attribute (TRUE, get_win32_name (), &ntsec_atts, &uid, &gid) && !ntsec_atts && uid == myself->uid && gid == myself->gid) { /* Check a special case here. If ntsec is ON it happens that a process creates a file using mode 000 to disallow other processes access. In contrast to UNIX, this results in a failing open call in the same process. Check that case. */ set_file_attribute (TRUE, get_win32_name (), 0400); oret = open (pc, open_flags, 0); set_file_attribute (TRUE, get_win32_name (), ntsec_atts); } } if (oret) { res = fstat_helper (buf); /* The number of links to a directory includes the number of subdirectories in the directory, since all those subdirectories point to it. This is too slow on remote drives, so we do without it and set the number of links to 2. */ /* Unfortunately the count of 2 confuses `find (1)' command. So let's try it with `1' as link count. */ if (pc->isdir ()) buf->st_nlink = (pc->isremote () ? 1 : num_entries (pc->get_win32 ())); close (); } else if (pc->exists ()) { /* Unfortunately, the above open may fail if the file exists, though. So we have to care for this case here, too. */ WIN32_FIND_DATA wfd; HANDLE handle; buf->st_nlink = 1; if (pc->isdir () && pc->isremote ()) buf->st_nlink = num_entries (pc->get_win32 ()); buf->st_dev = FHDEVN (FH_DISK) << 8; buf->st_ino = hash_path_name (0, pc->get_win32 ()); if (pc->isdir ()) buf->st_mode = S_IFDIR; else if (pc->issymlink ()) buf->st_mode = S_IFLNK; else if (pc->issocket ()) buf->st_mode = S_IFSOCK; else buf->st_mode = S_IFREG; if (!pc->has_acls () || get_file_attribute (TRUE, pc->get_win32 (), &buf->st_mode, &buf->st_uid, &buf->st_gid)) { buf->st_mode |= STD_RBITS | STD_XBITS; if (!(pc->has_attribute (FILE_ATTRIBUTE_READONLY))) buf->st_mode |= STD_WBITS; if (pc->issymlink ()) buf->st_mode |= S_IRWXU | S_IRWXG | S_IRWXO; get_file_attribute (FALSE, pc->get_win32 (), NULL, &buf->st_uid, &buf->st_gid); } if ((handle = FindFirstFile (pc->get_win32 (), &wfd)) != INVALID_HANDLE_VALUE) { /* This is for FAT filesystems, which don't support atime/ctime */ if (wfd.ftLastAccessTime.dwLowDateTime == 0 && wfd.ftLastAccessTime.dwHighDateTime == 0) wfd.ftLastAccessTime = wfd.ftLastWriteTime; if (wfd.ftCreationTime.dwLowDateTime == 0 && wfd.ftCreationTime.dwHighDateTime == 0) wfd.ftCreationTime = wfd.ftLastWriteTime; buf->st_atime = to_time_t (&wfd.ftLastAccessTime); buf->st_mtime = to_time_t (&wfd.ftLastWriteTime); buf->st_ctime = to_time_t (&wfd.ftCreationTime); buf->st_size = wfd.nFileSizeLow; buf->st_blksize = S_BLKSIZE; buf->st_blocks = ((unsigned long) buf->st_size + S_BLKSIZE-1) / S_BLKSIZE; FindClose (handle); } res = 0; } return res; } int fhandler_disk_file::fstat_helper (struct stat *buf) { int res = 0; // avoid a compiler warning BY_HANDLE_FILE_INFORMATION local; save_errno saved_errno; /* NT 3.51 seems to have a bug when attempting to get vol serial numbers. This loop gets around this. */ for (int i = 0; i < 2; i++) { if (!(res = GetFileInformationByHandle (get_handle (), &local))) break; if (local.dwVolumeSerialNumber && (long) local.dwVolumeSerialNumber != -1) break; } debug_printf ("%d = GetFileInformationByHandle (%s, %d)", res, get_win32_name (), get_handle ()); if (res == 0) { /* GetFileInformationByHandle will fail if it's given stdin/out/err or a pipe*/ DWORD lsize, hsize; if (GetFileType (get_handle ()) != FILE_TYPE_DISK) buf->st_mode = S_IFCHR; lsize = GetFileSize (get_handle (), &hsize); if (lsize == 0xffffffff && GetLastError () != NO_ERROR) buf->st_mode = S_IFCHR; else buf->st_size = lsize; /* We expect these to fail! */ buf->st_mode |= STD_RBITS | STD_WBITS; buf->st_blksize = S_BLKSIZE; buf->st_ino = get_namehash (); syscall_printf ("0 = fstat (, %p)", buf); return 0; } if (!get_win32_name ()) { saved_errno.set (ENOENT); return -1; } /* This is for FAT filesystems, which don't support atime/ctime */ if (local.ftLastAccessTime.dwLowDateTime == 0 && local.ftLastAccessTime.dwHighDateTime == 0) local.ftLastAccessTime = local.ftLastWriteTime; if (local.ftCreationTime.dwLowDateTime == 0 && local.ftCreationTime.dwHighDateTime == 0) local.ftCreationTime = local.ftLastWriteTime; buf->st_atime = to_time_t (&local.ftLastAccessTime); buf->st_mtime = to_time_t (&local.ftLastWriteTime); buf->st_ctime = to_time_t (&local.ftCreationTime); buf->st_nlink = local.nNumberOfLinks; buf->st_dev = local.dwVolumeSerialNumber; buf->st_size = local.nFileSizeLow; /* Allocate some place to determine the root directory. Need to allocate enough so that rootdir can add a trailing slash if path starts with \\. */ char root[strlen (get_win32_name ()) + 3]; strcpy (root, get_win32_name ()); /* Assume that if a drive has ACL support it MAY have valid "inodes". It definitely does not have valid inodes if it does not have ACL support. */ switch (has_acls () ? GetDriveType (rootdir (root)) : DRIVE_UNKNOWN) { case DRIVE_FIXED: case DRIVE_REMOVABLE: case DRIVE_CDROM: case DRIVE_RAMDISK: /* Although the documentation indicates otherwise, it seems like "inodes" on these devices are persistent, at least across reboots. */ buf->st_ino = local.nFileIndexHigh | local.nFileIndexLow; break; default: /* Either the nFileIndex* fields are unreliable or unavailable. Use the next best alternative. */ buf->st_ino = get_namehash (); break; } buf->st_blksize = S_BLKSIZE; buf->st_blocks = ((unsigned long) buf->st_size + S_BLKSIZE-1) / S_BLKSIZE; buf->st_mode = 0; /* Using a side effect: get_file_attibutes checks for directory. This is used, to set S_ISVTX, if needed. */ if (local.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) buf->st_mode = S_IFDIR; else if (get_symlink_p ()) buf->st_mode = S_IFLNK; else if (get_socket_p ()) buf->st_mode = S_IFSOCK; if (get_file_attribute (has_acls (), get_win32_name (), &buf->st_mode, &buf->st_uid, &buf->st_gid) == 0) { /* If read-only attribute is set, modify ntsec return value */ if ((local.dwFileAttributes & FILE_ATTRIBUTE_READONLY) && !get_symlink_p ()) buf->st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); if (!(buf->st_mode & S_IFMT)) buf->st_mode |= S_IFREG; } else { buf->st_mode |= STD_RBITS; if (!(local.dwFileAttributes & FILE_ATTRIBUTE_READONLY)) buf->st_mode |= STD_WBITS; /* | S_IWGRP | S_IWOTH; we don't give write to group etc */ if (buf->st_mode & S_IFDIR) buf->st_mode |= S_IFDIR | STD_XBITS; else if (buf->st_mode & S_IFMT) /* nothing */; else if (get_socket_p ()) buf->st_mode |= S_IFSOCK; else switch (GetFileType (get_handle ())) { case FILE_TYPE_CHAR: case FILE_TYPE_UNKNOWN: buf->st_mode |= S_IFCHR; break; case FILE_TYPE_DISK: buf->st_mode |= S_IFREG; if (!dont_care_if_execable () && !get_execable_p ()) { DWORD cur, done; char magic[3]; /* First retrieve current position, set to beginning of file if not already there. */ cur = SetFilePointer (get_handle(), 0, NULL, FILE_CURRENT); if (cur != INVALID_SET_FILE_POINTER && (!cur || SetFilePointer (get_handle(), 0, NULL, FILE_BEGIN) != INVALID_SET_FILE_POINTER)) { /* FIXME should we use /etc/magic ? */ magic[0] = magic[1] = magic[2] = '\0'; if (ReadFile (get_handle (), magic, 3, &done, NULL) && has_exec_chars (magic, done)) set_execable_p (); SetFilePointer (get_handle(), cur, NULL, FILE_BEGIN); } } if (get_execable_p ()) buf->st_mode |= STD_XBITS; break; case FILE_TYPE_PIPE: buf->st_mode |= S_IFSOCK; break; } } syscall_printf ("0 = fstat (, %p) st_atime=%x st_size=%d, st_mode=%p, st_ino=%d, sizeof=%d", buf, buf->st_atime, buf->st_size, buf->st_mode, (int) buf->st_ino, sizeof (*buf)); return 0; } fhandler_disk_file::fhandler_disk_file () : fhandler_base (FH_DISK) { } int fhandler_disk_file::open (path_conv *real_path, int flags, mode_t mode) { if (real_path->case_clash && flags & O_CREAT) { debug_printf ("Caseclash detected."); set_errno (ECASECLASH); return 0; } if (real_path->isbinary ()) { set_r_binary (1); set_w_binary (1); } set_has_acls (real_path->has_acls ()); set_isremote (real_path->isremote ()); if (real_path->isdir ()) flags |= O_DIROPEN; int res = this->fhandler_base::open (real_path, flags, mode); if (!res) goto out; /* This is for file systems known for having a buggy CreateFile call which might return a valid HANDLE without having actually opened the file. The only known file system to date is the SUN NFS Solstice Client 3.1 which returns a valid handle when trying to open a file in a nonexistent directory. */ if (real_path->has_buggy_open () && GetFileAttributes (win32_path_name) == (DWORD) -1) { debug_printf ("Buggy open detected."); close (); set_errno (ENOENT); return 0; } if (flags & O_APPEND) SetFilePointer (get_handle(), 0, 0, FILE_END); set_symlink_p (real_path->issymlink ()); set_execable_p (real_path->exec_state ()); set_socket_p (real_path->issocket ()); out: syscall_printf ("%d = fhandler_disk_file::open (%s, %p)", res, get_win32_name (), flags); return res; } int fhandler_disk_file::close () { int res = this->fhandler_base::close (); if (!res) cygwin_shared->delqueue.process_queue (); return res; } /* * FIXME !!! * The correct way to do this to get POSIX locking * semantics is to keep a linked list of posix lock * requests and map them into Win32 locks. The problem * is that Win32 does not deal correctly with overlapping * lock requests. Also another pain is that Win95 doesn't do * non-blocking or non exclusive locks at all. For '95 just * convert all lock requests into blocking,exclusive locks. * This shouldn't break many apps but denying all locking * would. * For now just convert to Win32 locks and hope for the best. */ int fhandler_disk_file::lock (int cmd, struct flock *fl) { int win32_start; int win32_len; DWORD win32_upper; DWORD startpos; /* * We don't do getlck calls yet. */ if (cmd == F_GETLK) { set_errno (ENOSYS); return -1; } /* * Calculate where in the file to start from, * then adjust this by fl->l_start. */ switch (fl->l_whence) { case SEEK_SET: startpos = 0; break; case SEEK_CUR: if ((off_t) (startpos = lseek (0, SEEK_CUR)) == (off_t)-1) return -1; break; case SEEK_END: { BY_HANDLE_FILE_INFORMATION finfo; if (GetFileInformationByHandle (get_handle(), &finfo) == 0) { __seterrno (); return -1; } startpos = finfo.nFileSizeLow; /* Nowhere to keep high word */ break; } default: set_errno (EINVAL); return -1; } /* * Now the fun starts. Adjust the start and length * fields until they make sense. */ win32_start = startpos + fl->l_start; if (fl->l_len < 0) { win32_start -= fl->l_len; win32_len = -fl->l_len; } else win32_len = fl->l_len; if (win32_start < 0) { /* watch the signs! */ win32_len -= -win32_start; if (win32_len <= 0) { /* Failure ! */ set_errno (EINVAL); return -1; } win32_start = 0; } /* * Special case if len == 0 for POSIX means lock * to the end of the entire file (and all future extensions). */ if (win32_len == 0) { win32_len = 0xffffffff; win32_upper = wincap.lock_file_highword (); } else win32_upper = 0; BOOL res; if (wincap.has_lock_file_ex ()) { DWORD lock_flags = (cmd == F_SETLK) ? LOCKFILE_FAIL_IMMEDIATELY : 0; lock_flags |= (fl->l_type == F_WRLCK) ? LOCKFILE_EXCLUSIVE_LOCK : 0; OVERLAPPED ov; ov.Internal = 0; ov.InternalHigh = 0; ov.Offset = (DWORD)win32_start; ov.OffsetHigh = 0; ov.hEvent = (HANDLE) 0; if (fl->l_type == F_UNLCK) { res = UnlockFileEx (get_handle (), 0, (DWORD)win32_len, win32_upper, &ov); } else { res = LockFileEx (get_handle (), lock_flags, 0, (DWORD)win32_len, win32_upper, &ov); /* Deal with the fail immediately case. */ /* * FIXME !! I think this is the right error to check for * but I must admit I haven't checked.... */ if ((res == 0) && (lock_flags & LOCKFILE_FAIL_IMMEDIATELY) && (GetLastError () == ERROR_LOCK_FAILED)) { set_errno (EAGAIN); return -1; } } } else { /* Windows 95 -- use primitive lock call */ if (fl->l_type == F_UNLCK) res = UnlockFile (get_handle (), (DWORD)win32_start, 0, (DWORD)win32_len, win32_upper); else res = LockFile (get_handle (), (DWORD)win32_start, 0, (DWORD)win32_len, win32_upper); } if (res == 0) { __seterrno (); return -1; } return 0; } DIR * fhandler_disk_file::opendir (const char *name, path_conv& real_name) { struct stat statbuf; DIR *dir; DIR *res = NULL; size_t len; if (fstat (&statbuf, &real_name) ||!(statbuf.st_mode & S_IFDIR)) set_errno (ENOTDIR); else if ((len = strlen (real_name))> MAX_PATH - 3) set_errno (ENAMETOOLONG); else if ((dir = (DIR *) malloc (sizeof (DIR))) == NULL) set_errno (ENOMEM); else if ((dir->__d_dirname = (char *) malloc (len + 3)) == NULL) { free (dir); set_errno (ENOMEM); } else if ((dir->__d_dirent = (struct dirent *) malloc (sizeof (struct dirent))) == NULL) { free (dir->__d_dirname); free (dir); set_errno (ENOMEM); } else { strcpy (dir->__d_dirname, real_name.get_win32 ()); dir->__d_dirent->d_version = __DIRENT_VERSION; cygheap_fdnew fd; fd = this; dir->__d_dirent->d_fd = fd; dir->__d_u.__d_data.__fh = this; /* FindFirstFile doesn't seem to like duplicate /'s. */ len = strlen (dir->__d_dirname); if (len == 0 || SLASH_P (dir->__d_dirname[len - 1])) strcat (dir->__d_dirname, "*"); else strcat (dir->__d_dirname, "\\*"); /**/ dir->__d_cookie = __DIRENT_COOKIE; dir->__d_u.__d_data.__handle = INVALID_HANDLE_VALUE; dir->__d_position = 0; dir->__d_dirhash = statbuf.st_ino; res = dir; } syscall_printf ("%p = opendir (%s)", res, name); return res; } struct dirent * fhandler_disk_file::readdir (DIR *dir) { WIN32_FIND_DATA buf; HANDLE handle; struct dirent *res = NULL; if (dir->__d_u.__d_data.__handle == INVALID_HANDLE_VALUE && dir->__d_position == 0) { handle = FindFirstFileA (dir->__d_dirname, &buf); DWORD lasterr = GetLastError (); dir->__d_u.__d_data.__handle = handle; if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) { seterrno_from_win_error (__FILE__, __LINE__, lasterr); return res; } } else if (dir->__d_u.__d_data.__handle == INVALID_HANDLE_VALUE) { return res; } else if (!FindNextFileA (dir->__d_u.__d_data.__handle, &buf)) { DWORD lasterr = GetLastError (); (void) FindClose (dir->__d_u.__d_data.__handle); dir->__d_u.__d_data.__handle = INVALID_HANDLE_VALUE; /* POSIX says you shouldn't set errno when readdir can't find any more files; so, if another error we leave it set. */ if (lasterr != ERROR_NO_MORE_FILES) seterrno_from_win_error (__FILE__, __LINE__, lasterr); syscall_printf ("%p = readdir (%p)", res, dir); return res; } /* We get here if `buf' contains valid data. */ strcpy (dir->__d_dirent->d_name, buf.cFileName); /* Check for Windows shortcut. If it's a Cygwin or U/WIN symlink, drop the .lnk suffix. */ if (buf.dwFileAttributes & FILE_ATTRIBUTE_READONLY) { char *c = dir->__d_dirent->d_name; int len = strlen (c); if (strcasematch (c + len - 4, ".lnk")) { char fbuf[MAX_PATH + 1]; strcpy (fbuf, dir->__d_dirname); strcpy (fbuf + strlen (fbuf) - 1, dir->__d_dirent->d_name); path_conv fpath (fbuf, PC_SYM_NOFOLLOW); if (fpath.issymlink ()) c[len - 4] = '\0'; } } /* Compute d_ino by combining filename hash with the directory hash (which was stored in dir->__d_dirhash when opendir was called). */ if (buf.cFileName[0] == '.') { if (buf.cFileName[1] == '\0') dir->__d_dirent->d_ino = dir->__d_dirhash; else if (buf.cFileName[1] != '.' || buf.cFileName[2] != '\0') goto hashit; else { char *p, up[strlen (dir->__d_dirname) + 1]; strcpy (up, dir->__d_dirname); if (!(p = strrchr (up, '\\'))) goto hashit; *p = '\0'; if (!(p = strrchr (up, '\\'))) dir->__d_dirent->d_ino = hash_path_name (0, "."); else { *p = '\0'; dir->__d_dirent->d_ino = hash_path_name (0, up); } } } else { hashit: ino_t dino = hash_path_name (dir->__d_dirhash, "\\"); dir->__d_dirent->d_ino = hash_path_name (dino, buf.cFileName); } ++dir->__d_position; res = dir->__d_dirent; syscall_printf ("%p = readdir (%p) (%s)", &dir->__d_dirent, dir, buf.cFileName); return res; } off_t fhandler_disk_file::telldir (DIR *dir) { return dir->__d_position; } void fhandler_disk_file::seekdir (DIR *dir, off_t loc) { rewinddir (dir); while (loc > dir->__d_position) if (! readdir (dir)) break; } void fhandler_disk_file::rewinddir (DIR *dir) { if (dir->__d_u.__d_data.__handle != INVALID_HANDLE_VALUE) { (void) FindClose (dir->__d_u.__d_data.__handle); dir->__d_u.__d_data.__handle = INVALID_HANDLE_VALUE; } dir->__d_position = 0; } int fhandler_disk_file::closedir (DIR *dir) { int res = 0; if (dir->__d_u.__d_data.__handle != INVALID_HANDLE_VALUE && FindClose (dir->__d_u.__d_data.__handle) == 0) { __seterrno (); res = -1; } syscall_printf ("%d = closedir (%p)", res, dir); return 0; }