reactos/base/services/nfsd/readdir.c

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