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650 lines
21 KiB
C
650 lines
21 KiB
C
/* NFSv4.1 client for Windows
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* Copyright © 2012 The Regents of the University of Michigan
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*
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* Olga Kornievskaia <aglo@umich.edu>
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* Casey Bodley <cbodley@umich.edu>
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* without any warranty; without even the implied warranty of merchantability
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* or fitness for a particular purpose. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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*/
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#include <windows.h>
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#include <strsafe.h>
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#include <stdlib.h>
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#include "from_kernel.h"
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#include "nfs41_ops.h"
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#include "daemon_debug.h"
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#include "upcall.h"
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#include "util.h"
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typedef union _FILE_DIR_INFO_UNION {
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ULONG NextEntryOffset;
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FILE_NAMES_INFORMATION fni;
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FILE_DIRECTORY_INFO fdi;
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FILE_FULL_DIR_INFO ffdi;
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FILE_ID_FULL_DIR_INFO fifdi;
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FILE_BOTH_DIR_INFORMATION fbdi;
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FILE_ID_BOTH_DIR_INFO fibdi;
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} FILE_DIR_INFO_UNION, *PFILE_DIR_INFO_UNION;
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/* NFS41_DIR_QUERY */
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static int parse_readdir(unsigned char *buffer, uint32_t length, nfs41_upcall *upcall)
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{
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int status;
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readdir_upcall_args *args = &upcall->args.readdir;
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status = safe_read(&buffer, &length, &args->query_class, sizeof(args->query_class));
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if (status) goto out;
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status = safe_read(&buffer, &length, &args->buf_len, sizeof(args->buf_len));
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if (status) goto out;
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status = get_name(&buffer, &length, &args->filter);
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if (status) goto out;
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status = safe_read(&buffer, &length, &args->initial, sizeof(args->initial));
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if (status) goto out;
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status = safe_read(&buffer, &length, &args->restart, sizeof(args->restart));
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if (status) goto out;
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status = safe_read(&buffer, &length, &args->single, sizeof(args->single));
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if (status) goto out;
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status = safe_read(&buffer, &length, &args->kbuf, sizeof(args->kbuf));
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if (status) goto out;
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args->root = upcall->root_ref;
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args->state = upcall->state_ref;
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dprintf(1, "parsing NFS41_DIR_QUERY: info_class=%d buf_len=%d "
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"filter='%s'\n\tInitial\\Restart\\Single %d\\%d\\%d buf=%p\n",
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args->query_class, args->buf_len, args->filter,
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args->initial, args->restart, args->single, args->kbuf);
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out:
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return status;
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}
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#define FILTER_STAR '*'
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#define FILTER_QM '>'
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static __inline const char* skip_stars(
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const char *filter)
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{
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while (*filter == FILTER_STAR)
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filter++;
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return filter;
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}
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static int readdir_filter(
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const char *filter,
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const char *name)
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{
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const char *f = filter, *n = name;
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while (*f && *n) {
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if (*f == FILTER_STAR) {
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f = skip_stars(f);
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if (*f == '\0')
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return 1;
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while (*n && !readdir_filter(f, n))
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n++;
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} else if (*f == FILTER_QM || *f == *n) {
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f++;
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n++;
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} else
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return 0;
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}
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return *f == *n || *skip_stars(f) == '\0';
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}
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static uint32_t readdir_size_for_entry(
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IN int query_class,
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IN uint32_t wname_size)
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{
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uint32_t needed = wname_size;
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switch (query_class)
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{
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case FileDirectoryInformation:
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needed += FIELD_OFFSET(FILE_DIRECTORY_INFO, FileName);
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break;
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case FileIdFullDirectoryInformation:
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needed += FIELD_OFFSET(FILE_ID_FULL_DIR_INFO, FileName);
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break;
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case FileFullDirectoryInformation:
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needed += FIELD_OFFSET(FILE_FULL_DIR_INFO, FileName);
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break;
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case FileIdBothDirectoryInformation:
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needed += FIELD_OFFSET(FILE_ID_BOTH_DIR_INFO, FileName);
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break;
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case FileBothDirectoryInformation:
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needed += FIELD_OFFSET(FILE_BOTH_DIR_INFORMATION, FileName);
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break;
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case FileNamesInformation:
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needed += FIELD_OFFSET(FILE_NAMES_INFORMATION, FileName);
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break;
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default:
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eprintf("unhandled dir query class %d\n", query_class);
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return 0;
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}
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return needed;
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}
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static void readdir_copy_dir_info(
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IN nfs41_readdir_entry *entry,
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IN PFILE_DIR_INFO_UNION info)
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{
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info->fdi.FileIndex = (ULONG)entry->attr_info.fileid;
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nfs_time_to_file_time(&entry->attr_info.time_create,
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&info->fdi.CreationTime);
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nfs_time_to_file_time(&entry->attr_info.time_access,
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&info->fdi.LastAccessTime);
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nfs_time_to_file_time(&entry->attr_info.time_modify,
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&info->fdi.LastWriteTime);
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/* XXX: was using 'change' attr, but that wasn't giving a time */
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nfs_time_to_file_time(&entry->attr_info.time_modify,
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&info->fdi.ChangeTime);
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info->fdi.EndOfFile.QuadPart =
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info->fdi.AllocationSize.QuadPart =
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entry->attr_info.size;
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info->fdi.FileAttributes = nfs_file_info_to_attributes(
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&entry->attr_info);
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}
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static void readdir_copy_shortname(
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IN LPCWSTR name,
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OUT LPWSTR name_out,
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OUT CCHAR *name_size_out)
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{
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/* GetShortPathName returns number of characters, not including \0 */
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*name_size_out = (CCHAR)GetShortPathNameW(name, name_out, 12);
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if (*name_size_out) {
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*name_size_out++;
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*name_size_out *= sizeof(WCHAR);
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}
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}
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static void readdir_copy_full_dir_info(
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IN nfs41_readdir_entry *entry,
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IN PFILE_DIR_INFO_UNION info)
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{
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readdir_copy_dir_info(entry, info);
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/* for files with the FILE_ATTRIBUTE_REPARSE_POINT attribute,
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* EaSize is used instead to specify its reparse tag. this makes
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* the 'dir' command to show files as <SYMLINK>, and triggers a
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* FSCTL_GET_REPARSE_POINT to query the symlink target
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*/
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info->fifdi.EaSize = entry->attr_info.type == NF4LNK ?
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IO_REPARSE_TAG_SYMLINK : 0;
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}
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static void readdir_copy_both_dir_info(
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IN nfs41_readdir_entry *entry,
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IN LPWSTR wname,
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IN PFILE_DIR_INFO_UNION info)
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{
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readdir_copy_full_dir_info(entry, info);
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readdir_copy_shortname(wname, info->fbdi.ShortName,
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&info->fbdi.ShortNameLength);
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}
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static void readdir_copy_filename(
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IN LPCWSTR name,
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IN uint32_t name_size,
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OUT LPWSTR name_out,
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OUT ULONG *name_size_out)
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{
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*name_size_out = name_size;
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memcpy(name_out, name, name_size);
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}
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static int format_abs_path(
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IN const nfs41_abs_path *path,
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IN const nfs41_component *name,
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OUT nfs41_abs_path *path_out)
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{
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/* format an absolute path 'parent\name' */
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int status = NO_ERROR;
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InitializeSRWLock(&path_out->lock);
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abs_path_copy(path_out, path);
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if (FAILED(StringCchPrintfA(path_out->path + path_out->len,
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NFS41_MAX_PATH_LEN - path_out->len, "\\%s", name->name))) {
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status = ERROR_FILENAME_EXCED_RANGE;
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goto out;
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}
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path_out->len += name->len + 1;
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out:
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return status;
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}
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static int lookup_entry(
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IN nfs41_root *root,
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IN nfs41_session *session,
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IN nfs41_path_fh *parent,
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OUT nfs41_readdir_entry *entry)
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{
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nfs41_abs_path path;
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nfs41_component name;
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int status;
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name.name = entry->name;
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name.len = (unsigned short)entry->name_len - 1;
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status = format_abs_path(parent->path, &name, &path);
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if (status) goto out;
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status = nfs41_lookup(root, session, &path,
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NULL, NULL, &entry->attr_info, NULL);
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if (status) goto out;
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out:
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return status;
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}
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static int lookup_symlink(
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IN nfs41_root *root,
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IN nfs41_session *session,
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IN nfs41_path_fh *parent,
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IN const nfs41_component *name,
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OUT nfs41_file_info *info_out)
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{
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nfs41_abs_path path;
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nfs41_path_fh file;
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nfs41_file_info info;
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int status;
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status = format_abs_path(parent->path, name, &path);
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if (status) goto out;
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file.path = &path;
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status = nfs41_lookup(root, session, &path, NULL, &file, &info, &session);
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if (status) goto out;
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last_component(path.path, path.path + path.len, &file.name);
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status = nfs41_symlink_follow(root, session, &file, &info);
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if (status) goto out;
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info_out->symlink_dir = info.type == NF4DIR;
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out:
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return status;
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}
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static int readdir_copy_entry(
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IN readdir_upcall_args *args,
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IN nfs41_readdir_entry *entry,
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IN OUT unsigned char **dst_pos,
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IN OUT uint32_t *dst_len)
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{
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int status = 0;
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WCHAR wname[NFS4_OPAQUE_LIMIT];
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uint32_t wname_len, wname_size, needed;
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PFILE_DIR_INFO_UNION info;
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wname_len = MultiByteToWideChar(CP_UTF8, 0,
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entry->name, entry->name_len, wname, NFS4_OPAQUE_LIMIT);
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wname_size = (wname_len - 1) * sizeof(WCHAR);
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needed = readdir_size_for_entry(args->query_class, wname_size);
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if (!needed || needed > *dst_len) {
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status = -1;
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goto out;
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}
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info = (PFILE_DIR_INFO_UNION)*dst_pos;
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info->NextEntryOffset = align8(needed);
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*dst_pos += info->NextEntryOffset;
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*dst_len -= info->NextEntryOffset;
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if (entry->attr_info.rdattr_error == NFS4ERR_MOVED) {
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entry->attr_info.type = NF4DIR; /* default to dir */
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/* look up attributes for referral entries, but ignore return value;
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* it's okay if lookup fails, we'll just write garbage attributes */
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lookup_entry(args->root, args->state->session,
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&args->state->file, entry);
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} else if (entry->attr_info.type == NF4LNK) {
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nfs41_component name;
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name.name = entry->name;
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name.len = (unsigned short)entry->name_len - 1;
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/* look up the symlink target to see whether it's a directory */
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lookup_symlink(args->root, args->state->session,
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&args->state->file, &name, &entry->attr_info);
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}
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switch (args->query_class)
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{
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case FileNamesInformation:
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info->fni.FileIndex = 0;
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readdir_copy_filename(wname, wname_size,
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info->fni.FileName, &info->fni.FileNameLength);
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break;
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case FileDirectoryInformation:
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readdir_copy_dir_info(entry, info);
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readdir_copy_filename(wname, wname_size,
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info->fdi.FileName, &info->fdi.FileNameLength);
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break;
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case FileFullDirectoryInformation:
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readdir_copy_full_dir_info(entry, info);
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readdir_copy_filename(wname, wname_size,
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info->ffdi.FileName, &info->ffdi.FileNameLength);
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break;
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case FileIdFullDirectoryInformation:
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readdir_copy_full_dir_info(entry, info);
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info->fibdi.FileId.QuadPart = (LONGLONG)entry->attr_info.fileid;
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readdir_copy_filename(wname, wname_size,
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info->fifdi.FileName, &info->fifdi.FileNameLength);
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break;
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case FileBothDirectoryInformation:
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readdir_copy_both_dir_info(entry, wname, info);
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readdir_copy_filename(wname, wname_size,
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info->fbdi.FileName, &info->fbdi.FileNameLength);
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break;
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case FileIdBothDirectoryInformation:
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readdir_copy_both_dir_info(entry, wname, info);
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info->fibdi.FileId.QuadPart = (LONGLONG)entry->attr_info.fileid;
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readdir_copy_filename(wname, wname_size,
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info->fibdi.FileName, &info->fibdi.FileNameLength);
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break;
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default:
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eprintf("unhandled dir query class %d\n", args->query_class);
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status = -1;
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break;
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}
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out:
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return status;
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}
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#define COOKIE_DOT ((uint64_t)-2)
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#define COOKIE_DOTDOT ((uint64_t)-1)
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static int readdir_add_dots(
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IN readdir_upcall_args *args,
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IN OUT unsigned char *entry_buf,
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IN uint32_t entry_buf_len,
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OUT uint32_t *len_out,
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OUT uint32_t **last_offset)
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{
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int status = 0;
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const uint32_t entry_len = (uint32_t)FIELD_OFFSET(nfs41_readdir_entry, name);
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nfs41_readdir_entry *entry;
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nfs41_open_state *state = args->state;
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*len_out = 0;
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*last_offset = NULL;
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switch (state->cookie.cookie) {
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case 0:
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if (entry_buf_len < entry_len + 2) {
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status = ERROR_BUFFER_OVERFLOW;
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dprintf(1, "not enough room for '.' entry. received %d need %d\n",
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entry_buf_len, entry_len + 2);
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args->query_reply_len = entry_len + 2;
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goto out;
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}
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entry = (nfs41_readdir_entry*)entry_buf;
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ZeroMemory(&entry->attr_info, sizeof(nfs41_file_info));
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status = nfs41_cached_getattr(state->session,
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&state->file, &entry->attr_info);
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if (status) {
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dprintf(1, "failed to add '.' entry.\n");
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goto out;
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}
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entry->cookie = COOKIE_DOT;
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entry->name_len = 2;
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StringCbCopyA(entry->name, entry->name_len, ".");
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entry->next_entry_offset = entry_len + entry->name_len;
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entry_buf += entry->next_entry_offset;
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entry_buf_len -= entry->next_entry_offset;
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*len_out += entry->next_entry_offset;
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*last_offset = &entry->next_entry_offset;
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if (args->single)
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break;
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/* else no break! */
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case COOKIE_DOT:
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if (entry_buf_len < entry_len + 3) {
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status = ERROR_BUFFER_OVERFLOW;
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dprintf(1, "not enough room for '..' entry. received %d need %d\n",
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entry_buf_len, entry_len);
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args->query_reply_len = entry_len + 2;
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goto out;
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}
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/* XXX: this skips '..' when listing root fh */
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if (state->file.name.len == 0)
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break;
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entry = (nfs41_readdir_entry*)entry_buf;
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ZeroMemory(&entry->attr_info, sizeof(nfs41_file_info));
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status = nfs41_cached_getattr(state->session,
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&state->parent, &entry->attr_info);
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if (status) {
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status = ERROR_FILE_NOT_FOUND;
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dprintf(1, "failed to add '..' entry.\n");
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goto out;
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}
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entry->cookie = COOKIE_DOTDOT;
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entry->name_len = 3;
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StringCbCopyA(entry->name, entry->name_len, "..");
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entry->next_entry_offset = entry_len + entry->name_len;
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entry_buf += entry->next_entry_offset;
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entry_buf_len -= entry->next_entry_offset;
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*len_out += entry->next_entry_offset;
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*last_offset = &entry->next_entry_offset;
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break;
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}
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if (state->cookie.cookie == COOKIE_DOTDOT ||
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state->cookie.cookie == COOKIE_DOT)
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ZeroMemory(&state->cookie, sizeof(nfs41_readdir_cookie));
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out:
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return status;
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}
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static int handle_readdir(nfs41_upcall *upcall)
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{
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int status;
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readdir_upcall_args *args = &upcall->args.readdir;
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nfs41_open_state *state = upcall->state_ref;
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unsigned char *entry_buf = NULL;
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uint32_t entry_buf_len;
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bitmap4 attr_request;
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bool_t eof;
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/* make sure we allocate enough space for one nfs41_readdir_entry */
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const uint32_t max_buf_len = max(args->buf_len,
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sizeof(nfs41_readdir_entry) + NFS41_MAX_COMPONENT_LEN);
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dprintf(1, "-> handle_nfs41_dirquery(%s,%d,%d,%d)\n",
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args->filter, args->initial, args->restart, args->single);
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args->query_reply_len = 0;
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if (args->initial || args->restart) {
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ZeroMemory(&state->cookie, sizeof(nfs41_readdir_cookie));
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if (!state->cookie.cookie)
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dprintf(1, "initializing the 1st readdir cookie\n");
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else if (args->restart)
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dprintf(1, "restarting; clearing previous cookie %llu\n",
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state->cookie.cookie);
|
|
else if (args->initial)
|
|
dprintf(1, "*** initial; clearing previous cookie %llu!\n",
|
|
state->cookie.cookie);
|
|
} else if (!state->cookie.cookie) {
|
|
dprintf(1, "handle_nfs41_readdir: EOF\n");
|
|
status = ERROR_NO_MORE_FILES;
|
|
goto out;
|
|
}
|
|
|
|
entry_buf = calloc(max_buf_len, sizeof(unsigned char));
|
|
if (entry_buf == NULL) {
|
|
status = GetLastError();
|
|
goto out_free_cookie;
|
|
}
|
|
fetch_entries:
|
|
entry_buf_len = max_buf_len;
|
|
|
|
nfs41_superblock_getattr_mask(state->file.fh.superblock, &attr_request);
|
|
attr_request.arr[0] |= FATTR4_WORD0_RDATTR_ERROR;
|
|
|
|
if (strchr(args->filter, FILTER_STAR) || strchr(args->filter, FILTER_QM)) {
|
|
/* use READDIR for wildcards */
|
|
|
|
uint32_t dots_len = 0;
|
|
uint32_t *dots_next_offset = NULL;
|
|
|
|
if (args->filter[0] == '*' && args->filter[1] == '\0') {
|
|
status = readdir_add_dots(args, entry_buf,
|
|
entry_buf_len, &dots_len, &dots_next_offset);
|
|
if (status)
|
|
goto out_free_cookie;
|
|
entry_buf_len -= dots_len;
|
|
}
|
|
|
|
if (dots_len && args->single) {
|
|
dprintf(2, "skipping nfs41_readdir because the single query "
|
|
"will use . or ..\n");
|
|
entry_buf_len = 0;
|
|
eof = 0;
|
|
} else {
|
|
dprintf(2, "calling nfs41_readdir with cookie %llu\n",
|
|
state->cookie.cookie);
|
|
status = nfs41_readdir(state->session, &state->file,
|
|
&attr_request, &state->cookie, entry_buf + dots_len,
|
|
&entry_buf_len, &eof);
|
|
if (status) {
|
|
dprintf(1, "nfs41_readdir failed with %s\n",
|
|
nfs_error_string(status));
|
|
status = nfs_to_windows_error(status, ERROR_BAD_NET_RESP);
|
|
goto out_free_cookie;
|
|
}
|
|
}
|
|
|
|
if (!entry_buf_len && dots_next_offset)
|
|
*dots_next_offset = 0;
|
|
entry_buf_len += dots_len;
|
|
} else {
|
|
/* use LOOKUP for single files */
|
|
nfs41_readdir_entry *entry = (nfs41_readdir_entry*)entry_buf;
|
|
entry->cookie = 0;
|
|
entry->name_len = (uint32_t)strlen(args->filter) + 1;
|
|
StringCbCopyA(entry->name, entry->name_len, args->filter);
|
|
entry->next_entry_offset = 0;
|
|
|
|
status = lookup_entry(upcall->root_ref,
|
|
state->session, &state->file, entry);
|
|
if (status) {
|
|
dprintf(1, "single_lookup failed with %d\n", status);
|
|
goto out_free_cookie;
|
|
}
|
|
entry_buf_len = entry->name_len +
|
|
FIELD_OFFSET(nfs41_readdir_entry, name);
|
|
|
|
eof = 1;
|
|
}
|
|
|
|
status = args->initial ? ERROR_FILE_NOT_FOUND : ERROR_NO_MORE_FILES;
|
|
|
|
if (entry_buf_len) {
|
|
unsigned char *entry_pos = entry_buf;
|
|
unsigned char *dst_pos = args->kbuf;
|
|
uint32_t dst_len = args->buf_len;
|
|
nfs41_readdir_entry *entry;
|
|
PULONG offset, last_offset = NULL;
|
|
|
|
for (;;) {
|
|
entry = (nfs41_readdir_entry*)entry_pos;
|
|
offset = (PULONG)dst_pos; /* ULONG NextEntryOffset */
|
|
|
|
dprintf(2, "filter %s looking at %s with cookie %d\n",
|
|
args->filter, entry->name, entry->cookie);
|
|
if (readdir_filter((const char*)args->filter, entry->name)) {
|
|
if (readdir_copy_entry(args, entry, &dst_pos, &dst_len)) {
|
|
eof = 0;
|
|
dprintf(2, "not enough space to copy entry %s (cookie %d)\n",
|
|
entry->name, entry->cookie);
|
|
break;
|
|
}
|
|
last_offset = offset;
|
|
status = NO_ERROR;
|
|
}
|
|
state->cookie.cookie = entry->cookie;
|
|
|
|
/* last entry we got from the server */
|
|
if (!entry->next_entry_offset)
|
|
break;
|
|
|
|
/* we found our single entry, but the server has more */
|
|
if (args->single && last_offset) {
|
|
eof = 0;
|
|
break;
|
|
}
|
|
entry_pos += entry->next_entry_offset;
|
|
}
|
|
args->query_reply_len = args->buf_len - dst_len;
|
|
if (last_offset) {
|
|
*last_offset = 0;
|
|
} else if (!eof) {
|
|
dprintf(1, "no entries matched; fetch more\n");
|
|
goto fetch_entries;
|
|
}
|
|
}
|
|
|
|
if (eof) {
|
|
dprintf(1, "we don't need to save a cookie\n");
|
|
goto out_free_cookie;
|
|
} else
|
|
dprintf(1, "saving cookie %llu\n", state->cookie.cookie);
|
|
|
|
out_free_entry:
|
|
free(entry_buf);
|
|
out:
|
|
dprintf(1, "<- handle_nfs41_dirquery(%s,%d,%d,%d) returning ",
|
|
args->filter, args->initial, args->restart, args->single);
|
|
if (status) {
|
|
switch (status) {
|
|
case ERROR_FILE_NOT_FOUND:
|
|
dprintf(1, "ERROR_FILE_NOT_FOUND.\n");
|
|
break;
|
|
case ERROR_NO_MORE_FILES:
|
|
dprintf(1, "ERROR_NO_MORE_FILES.\n");
|
|
break;
|
|
case ERROR_BUFFER_OVERFLOW:
|
|
upcall->last_error = status;
|
|
status = ERROR_SUCCESS;
|
|
break;
|
|
default:
|
|
dprintf(1, "error code %d.\n", status);
|
|
break;
|
|
}
|
|
} else {
|
|
dprintf(1, "success!\n");
|
|
}
|
|
return status;
|
|
out_free_cookie:
|
|
state->cookie.cookie = 0;
|
|
goto out_free_entry;
|
|
}
|
|
|
|
static int marshall_readdir(unsigned char *buffer, uint32_t *length, nfs41_upcall *upcall)
|
|
{
|
|
int status;
|
|
readdir_upcall_args *args = &upcall->args.readdir;
|
|
|
|
status = safe_write(&buffer, length, &args->query_reply_len, sizeof(args->query_reply_len));
|
|
return status;
|
|
}
|
|
|
|
|
|
const nfs41_upcall_op nfs41_op_readdir = {
|
|
parse_readdir,
|
|
handle_readdir,
|
|
marshall_readdir
|
|
};
|