+++ /dev/null
-/* 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 <stdio.h>
-#include <strsafe.h>
-
-#include "from_kernel.h"
-#include "nfs41_ops.h"
-#include "delegation.h"
-#include "upcall.h"
-#include "daemon_debug.h"
-
-
-#define EALVL 2 /* dprintf level for extended attribute logging */
-
-
-static int set_ea_value(
- IN nfs41_session *session,
- IN nfs41_path_fh *parent,
- IN state_owner4 *owner,
- IN PFILE_FULL_EA_INFORMATION ea)
-{
- nfs41_path_fh file = { 0 };
- nfs41_file_info createattrs;
- open_claim4 claim;
- stateid_arg stateid;
- open_delegation4 delegation = { 0 };
- nfs41_write_verf verf;
- uint32_t bytes_written;
- int status;
-
- /* don't allow values larger than NFS4_EASIZE */
- if (ea->EaValueLength > NFS4_EASIZE) {
- eprintf("trying to write extended attribute value of size %d, "
- "max allowed %d\n", ea->EaValueLength, NFS4_EASIZE);
- status = NFS4ERR_FBIG;
- goto out;
- }
- /* remove the file on empty value */
- if (ea->EaValueLength == 0) {
- nfs41_component name;
- name.name = ea->EaName;
- name.len = ea->EaNameLength;
- nfs41_remove(session, parent, &name, 0);
- status = NFS4_OK;
- goto out;
- }
-
- claim.claim = CLAIM_NULL;
- claim.u.null.filename = &file.name;
- file.name.name = ea->EaName;
- file.name.len = ea->EaNameLength;
-
- createattrs.attrmask.count = 2;
- createattrs.attrmask.arr[0] = FATTR4_WORD0_SIZE;
- createattrs.attrmask.arr[1] = FATTR4_WORD1_MODE;
- createattrs.size = 0;
- createattrs.mode = 0664;
-
- status = nfs41_open(session, parent, &file, owner, &claim,
- OPEN4_SHARE_ACCESS_WRITE | OPEN4_SHARE_ACCESS_WANT_NO_DELEG,
- OPEN4_SHARE_DENY_BOTH, OPEN4_CREATE, UNCHECKED4,
- &createattrs, TRUE, &stateid.stateid, &delegation, NULL);
- if (status) {
- eprintf("nfs41_open() failed with %s\n", nfs_error_string(status));
- goto out;
- }
-
- status = nfs41_write(session, &file, &stateid,
- (unsigned char*)ea->EaName + ea->EaNameLength + 1,
- ea->EaValueLength, 0, FILE_SYNC4, &bytes_written,
- &verf, NULL);
- if (status) {
- eprintf("nfs41_write() failed with %s\n", nfs_error_string(status));
- goto out_close;
- }
-
-out_close:
- nfs41_close(session, &file, &stateid);
-out:
- return status;
-}
-
-static int is_cygwin_ea(
- PFILE_FULL_EA_INFORMATION ea)
-{
- return (strncmp("NfsV3Attributes", ea->EaName, ea->EaNameLength) == 0
- && sizeof("NfsV3Attributes")-1 == ea->EaNameLength)
- || (strncmp("NfsActOnLink", ea->EaName, ea->EaNameLength) == 0
- && sizeof("NfsActOnLink")-1 == ea->EaNameLength)
- || (strncmp("NfsSymlinkTargetName", ea->EaName, ea->EaNameLength) == 0
- && sizeof("NfsSymlinkTargetName")-1 == ea->EaNameLength);
-}
-
-#define NEXT_ENTRY(ea) ((PBYTE)(ea) + (ea)->NextEntryOffset)
-
-int nfs41_ea_set(
- IN nfs41_open_state *state,
- IN PFILE_FULL_EA_INFORMATION ea)
-{
- nfs41_path_fh attrdir = { 0 };
- int status;
-
- status = nfs41_rpc_openattr(state->session, &state->file, TRUE, &attrdir.fh);
- if (status) {
- eprintf("nfs41_rpc_openattr() failed with error %s\n",
- nfs_error_string(status));
- goto out;
- }
-
- while (status == NFS4_OK) {
- if (!is_cygwin_ea(ea))
- status = set_ea_value(state->session, &attrdir, &state->owner, ea);
-
- if (ea->NextEntryOffset == 0)
- break;
- ea = (PFILE_FULL_EA_INFORMATION)NEXT_ENTRY(ea);
- }
-out:
- return status;
-}
-
-
-/* NFS41_EA_SET */
-static int parse_setexattr(unsigned char *buffer, uint32_t length, nfs41_upcall *upcall)
-{
- int status;
- setexattr_upcall_args *args = &upcall->args.setexattr;
-
- status = get_name(&buffer, &length, &args->path);
- if (status) goto out;
- status = safe_read(&buffer, &length, &args->mode, sizeof(args->mode));
- if (status) goto out;
- status = safe_read(&buffer, &length, &args->buf_len, sizeof(args->buf_len));
- if (status) goto out;
- args->buf = buffer;
-
- dprintf(1, "parsing NFS41_EA_SET: mode=%o\n", args->mode);
-out:
- return status;
-}
-
-static int handle_setexattr(nfs41_upcall *upcall)
-{
- int status;
- setexattr_upcall_args *args = &upcall->args.setexattr;
- nfs41_open_state *state = upcall->state_ref;
- PFILE_FULL_EA_INFORMATION ea =
- (PFILE_FULL_EA_INFORMATION)args->buf;
-
- /* break read delegations before SETATTR */
- nfs41_delegation_return(state->session, &state->file,
- OPEN_DELEGATE_READ, FALSE);
-
- if (strncmp("NfsV3Attributes", ea->EaName, ea->EaNameLength) == 0
- && sizeof("NfsV3Attributes")-1 == ea->EaNameLength) {
- nfs41_file_info info;
- stateid_arg stateid;
-
- nfs41_open_stateid_arg(state, &stateid);
-
- info.mode = args->mode;
- info.attrmask.arr[0] = 0;
- info.attrmask.arr[1] = FATTR4_WORD1_MODE;
- info.attrmask.count = 2;
-
- status = nfs41_setattr(state->session, &state->file, &stateid, &info);
- if (status) {
- dprintf(1, "nfs41_setattr() failed with error %s.\n",
- nfs_error_string(status));
- goto out;
- }
-
- args->ctime = info.change;
- goto out;
- }
-
- status = nfs41_ea_set(state, ea);
-out:
- return nfs_to_windows_error(status, ERROR_NOT_SUPPORTED);
-}
-
-static int marshall_setexattr(unsigned char *buffer, uint32_t *length, nfs41_upcall *upcall)
-{
- setexattr_upcall_args *args = &upcall->args.setexattr;
- return safe_write(&buffer, length, &args->ctime, sizeof(args->ctime));
-}
-
-
-/* NFS41_EA_GET */
-static int parse_getexattr(unsigned char *buffer, uint32_t length, nfs41_upcall *upcall)
-{
- int status;
- getexattr_upcall_args *args = &upcall->args.getexattr;
-
- status = get_name(&buffer, &length, &args->path);
- if (status) goto out;
- status = safe_read(&buffer, &length, &args->eaindex, sizeof(args->eaindex));
- 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->buf_len, sizeof(args->buf_len));
- if (status) goto out;
- status = safe_read(&buffer, &length, &args->ealist_len, sizeof(args->ealist_len));
- if (status) goto out;
- args->ealist = args->ealist_len ? buffer : NULL;
-
- dprintf(1, "parsing NFS41_EA_GET: buf_len=%d Index %d Restart %d "
- "Single %d\n", args->buf_len,args->eaindex, args->restart, args->single);
-out:
- return status;
-}
-
-#define READDIR_LEN_INITIAL 8192
-#define READDIR_LEN_MIN 2048
-
-/* call readdir repeatedly to get a complete list of entries */
-static int read_entire_dir(
- IN nfs41_session *session,
- IN nfs41_path_fh *eadir,
- OUT unsigned char **buffer_out,
- OUT uint32_t *length_out)
-{
- nfs41_readdir_cookie cookie = { 0 };
- bitmap4 attr_request;
- nfs41_readdir_entry *last_entry;
- unsigned char *buffer;
- uint32_t buffer_len, len, total_len;
- bool_t eof;
- int status = NO_ERROR;
-
- attr_request.count = 0; /* don't request attributes */
-
- /* allocate the buffer for readdir entries */
- buffer_len = READDIR_LEN_INITIAL;
- buffer = calloc(1, buffer_len);
- if (buffer == NULL) {
- status = GetLastError();
- goto out;
- }
-
- last_entry = NULL;
- total_len = 0;
- eof = FALSE;
-
- while (!eof) {
- len = buffer_len - total_len;
- if (len < READDIR_LEN_MIN) {
- const ptrdiff_t diff = (unsigned char*)last_entry - buffer;
- /* realloc the buffer to fit more entries */
- unsigned char *tmp = realloc(buffer, buffer_len * 2);
- if (tmp == NULL) {
- status = GetLastError();
- goto out_free;
- }
-
- if (last_entry) /* fix last_entry pointer */
- last_entry = (nfs41_readdir_entry*)(tmp + diff);
- buffer = tmp;
- buffer_len *= 2;
- len = buffer_len - total_len;
- }
-
- /* fetch the next group of entries */
- status = nfs41_readdir(session, eadir, &attr_request,
- &cookie, buffer + total_len, &len, &eof);
- if (status)
- goto out_free;
-
- if (last_entry == NULL) {
- /* initialize last_entry to the front of the list */
- last_entry = (nfs41_readdir_entry*)(buffer + total_len);
- } else if (len) {
- /* link the previous list to the new one */
- last_entry->next_entry_offset = (uint32_t)FIELD_OFFSET(
- nfs41_readdir_entry, name) + last_entry->name_len;
- }
-
- /* find the new last entry */
- while (last_entry->next_entry_offset) {
- last_entry = (nfs41_readdir_entry*)((char*)last_entry +
- last_entry->next_entry_offset);
- }
-
- cookie.cookie = last_entry->cookie;
- total_len += len;
- }
-
- *buffer_out = buffer;
- *length_out = total_len;
-out:
- return status;
-
-out_free:
- free(buffer);
- goto out;
-}
-
-#define ALIGNED_EASIZE(len) (align4(sizeof(FILE_GET_EA_INFORMATION) + len))
-
-static uint32_t calculate_ea_list_length(
- IN const unsigned char *position,
- IN uint32_t remaining)
-{
- const nfs41_readdir_entry *entry;
- uint32_t length = 0;
-
- while (remaining) {
- entry = (const nfs41_readdir_entry*)position;
- length += ALIGNED_EASIZE(entry->name_len);
-
- if (!entry->next_entry_offset)
- break;
-
- position += entry->next_entry_offset;
- remaining -= entry->next_entry_offset;
- }
- return length;
-}
-
-static void populate_ea_list(
- IN const unsigned char *position,
- OUT PFILE_GET_EA_INFORMATION ea_list)
-{
- const nfs41_readdir_entry *entry;
- PFILE_GET_EA_INFORMATION ea = ea_list, prev = NULL;
-
- for (;;) {
- entry = (const nfs41_readdir_entry*)position;
- StringCchCopyA(ea->EaName, entry->name_len, entry->name);
- ea->EaNameLength = (UCHAR)entry->name_len - 1;
-
- if (!entry->next_entry_offset) {
- ea->NextEntryOffset = 0;
- break;
- }
-
- prev = ea;
- ea->NextEntryOffset = ALIGNED_EASIZE(ea->EaNameLength);
- ea = (PFILE_GET_EA_INFORMATION)NEXT_ENTRY(ea);
- position += entry->next_entry_offset;
- }
-}
-
-static int get_ea_list(
- IN OUT nfs41_open_state *state,
- IN nfs41_path_fh *eadir,
- OUT PFILE_GET_EA_INFORMATION *ealist_out,
- OUT uint32_t *eaindex_out)
-{
- unsigned char *entry_list;
- PFILE_GET_EA_INFORMATION ea_list;
- uint32_t entry_len, ea_size;
- int status = NO_ERROR;
-
- EnterCriticalSection(&state->ea.lock);
-
- if (state->ea.list != INVALID_HANDLE_VALUE) {
- /* use cached ea names */
- *ealist_out = state->ea.list;
- *eaindex_out = state->ea.index;
- goto out;
- }
-
- /* read the entire directory into a nfs41_readdir_entry buffer */
- status = read_entire_dir(state->session, eadir, &entry_list, &entry_len);
- if (status)
- goto out;
-
- ea_size = calculate_ea_list_length(entry_list, entry_len);
- if (ea_size == 0) {
- *ealist_out = state->ea.list = NULL;
- goto out_free;
- }
- ea_list = calloc(1, ea_size);
- if (ea_list == NULL) {
- status = GetLastError();
- goto out_free;
- }
-
- populate_ea_list(entry_list, ea_list);
-
- *ealist_out = state->ea.list = ea_list;
- *eaindex_out = state->ea.index;
-out_free:
- free(entry_list); /* allocated by read_entire_dir() */
-out:
- LeaveCriticalSection(&state->ea.lock);
- return status;
-}
-
-static int get_ea_value(
- IN nfs41_session *session,
- IN nfs41_path_fh *parent,
- IN state_owner4 *owner,
- OUT PFILE_FULL_EA_INFORMATION ea,
- IN uint32_t length,
- OUT uint32_t *needed)
-{
- nfs41_path_fh file = { 0 };
- open_claim4 claim;
- stateid_arg stateid;
- open_delegation4 delegation = { 0 };
- nfs41_file_info info;
- unsigned char *buffer;
- uint32_t diff, bytes_read;
- bool_t eof;
- int status;
-
- if (parent->fh.len == 0) /* no named attribute directory */
- goto out_empty;
-
- claim.claim = CLAIM_NULL;
- claim.u.null.filename = &file.name;
- file.name.name = ea->EaName;
- file.name.len = ea->EaNameLength;
-
- status = nfs41_open(session, parent, &file, owner, &claim,
- OPEN4_SHARE_ACCESS_READ | OPEN4_SHARE_ACCESS_WANT_NO_DELEG,
- OPEN4_SHARE_DENY_WRITE, OPEN4_NOCREATE, UNCHECKED4, NULL, TRUE,
- &stateid.stateid, &delegation, &info);
- if (status) {
- eprintf("nfs41_open() failed with %s\n", nfs_error_string(status));
- if (status == NFS4ERR_NOENT)
- goto out_empty;
- goto out;
- }
-
- if (info.size > NFS4_EASIZE) {
- status = NFS4ERR_FBIG;
- eprintf("EA value for '%s' longer than maximum %u "
- "(%llu bytes), returning %s\n", ea->EaName, NFS4_EASIZE,
- info.size, nfs_error_string(status));
- goto out_close;
- }
-
- buffer = (unsigned char*)ea->EaName + ea->EaNameLength + 1;
- diff = (uint32_t)(buffer - (unsigned char*)ea);
-
- /* make sure we have room for the value */
- if (length < diff + info.size) {
- *needed = (uint32_t)(sizeof(FILE_FULL_EA_INFORMATION) +
- ea->EaNameLength + info.size);
- status = NFS4ERR_TOOSMALL;
- goto out_close;
- }
-
- /* read directly into the ea buffer */
- status = nfs41_read(session, &file, &stateid,
- 0, length - diff, buffer, &bytes_read, &eof);
- if (status) {
- eprintf("nfs41_read() failed with %s\n", nfs_error_string(status));
- goto out_close;
- }
- if (!eof) {
- *needed = (uint32_t)(sizeof(FILE_FULL_EA_INFORMATION) +
- ea->EaNameLength + NFS4_EASIZE);
- status = NFS4ERR_TOOSMALL;
- goto out_close;
- }
-
- ea->EaValueLength = (USHORT)bytes_read;
-
-out_close:
- nfs41_close(session, &file, &stateid);
-out:
- return status;
-
-out_empty: /* return an empty value */
- ea->EaValueLength = 0;
- status = NFS4_OK;
- goto out;
-}
-
-static int empty_ea_error(
- IN uint32_t index,
- IN BOOLEAN restart)
-{
- /* choose an error value depending on the arguments */
- if (index)
- return ERROR_INVALID_EA_HANDLE;
-
- if (!restart)
- return ERROR_NO_MORE_FILES; /* -> STATUS_NO_MORE_EAS */
-
- return ERROR_FILE_NOT_FOUND; /* -> STATUS_NO_EAS_ON_FILE */
-}
-
-static int overflow_error(
- IN OUT getexattr_upcall_args *args,
- IN PFILE_FULL_EA_INFORMATION prev,
- IN uint32_t needed)
-{
- if (prev) {
- /* unlink the overflowing entry, but copy the entries that fit */
- prev->NextEntryOffset = 0;
- args->overflow = ERROR_BUFFER_OVERFLOW;
- } else {
- /* no entries fit; return only the length needed */
- args->buf_len = needed;
- args->overflow = ERROR_INSUFFICIENT_BUFFER;
- }
-
- /* in either case, the upcall must return NO_ERROR so we
- * can copy this information down to the driver */
- return NO_ERROR;
-}
-
-static int handle_getexattr(nfs41_upcall *upcall)
-{
- getexattr_upcall_args *args = &upcall->args.getexattr;
- PFILE_GET_EA_INFORMATION query = (PFILE_GET_EA_INFORMATION)args->ealist;
- PFILE_FULL_EA_INFORMATION ea, prev = NULL;
- nfs41_open_state *state = upcall->state_ref;
- nfs41_path_fh parent = { 0 };
- uint32_t remaining, needed, index = 0;
- int status;
-
- status = nfs41_rpc_openattr(state->session, &state->file, FALSE, &parent.fh);
- if (status == NFS4ERR_NOENT) { /* no named attribute directory */
- dprintf(EALVL, "no named attribute directory for '%s'\n", args->path);
- if (query == NULL) {
- status = empty_ea_error(args->eaindex, args->restart);
- goto out;
- }
- } else if (status) {
- eprintf("nfs41_rpc_openattr() failed with %s\n",
- nfs_error_string(status));
- status = nfs_to_windows_error(status, ERROR_EAS_NOT_SUPPORTED);
- goto out;
- }
-
- if (query == NULL) {
- /* if no names are queried, use READDIR to list them all */
- uint32_t i;
- status = get_ea_list(state, &parent, &query, &index);
- if (status)
- goto out;
-
- if (query == NULL) { /* the file has no EAs */
- dprintf(EALVL, "empty named attribute directory for '%s'\n",
- args->path);
- status = empty_ea_error(args->eaindex, args->restart);
- goto out;
- }
-
- if (args->eaindex)
- index = args->eaindex - 1; /* convert to zero-based index */
- else if (args->restart)
- index = 0;
-
- /* advance the list to the specified index */
- for (i = 0; i < index; i++) {
- if (query->NextEntryOffset == 0) {
- if (args->eaindex)
- status = ERROR_INVALID_EA_HANDLE;
- else
- status = ERROR_NO_MORE_FILES; /* STATUS_NO_MORE_EAS */
- goto out;
- }
- query = (PFILE_GET_EA_INFORMATION)NEXT_ENTRY(query);
- }
- }
-
- /* returned ea information can't exceed the downcall buffer size */
- if (args->buf_len > UPCALL_BUF_SIZE - 2 * sizeof(uint32_t))
- args->buf_len = UPCALL_BUF_SIZE - 2 * sizeof(uint32_t);
-
- args->buf = malloc(args->buf_len);
- if (args->buf == NULL) {
- status = GetLastError();
- goto out;
- }
-
- ea = (PFILE_FULL_EA_INFORMATION)args->buf;
- remaining = args->buf_len;
-
- for (;;) {
- /* make sure we have room for at least the name */
- needed = sizeof(FILE_FULL_EA_INFORMATION) + query->EaNameLength;
- if (needed > remaining) {
- status = overflow_error(args, prev, needed + NFS4_EASIZE);
- goto out;
- }
-
- ea->EaNameLength = query->EaNameLength;
- StringCchCopy(ea->EaName, ea->EaNameLength + 1, query->EaName);
- ea->Flags = 0;
-
- /* read the value from file */
- status = get_ea_value(state->session, &parent,
- &state->owner, ea, remaining, &needed);
- if (status == NFS4ERR_TOOSMALL) {
- status = overflow_error(args, prev, needed);
- goto out;
- }
- if (status) {
- status = nfs_to_windows_error(status, ERROR_EA_FILE_CORRUPT);
- goto out_free;
- }
-
- needed = align4(FIELD_OFFSET(FILE_FULL_EA_INFORMATION, EaName) +
- ea->EaNameLength + 1 + ea->EaValueLength);
-
- if (remaining < needed) {
- /* align4 may push NextEntryOffset past our buffer, but we
- * were still able to fit the ea value. set remaining = 0
- * so we'll fail on the next ea (if any) */
- remaining = 0;
- } else
- remaining -= needed;
-
- index++;
- if (query->NextEntryOffset == 0 || args->single)
- break;
-
- prev = ea;
- ea->NextEntryOffset = needed;
- ea = (PFILE_FULL_EA_INFORMATION)NEXT_ENTRY(ea);
- query = (PFILE_GET_EA_INFORMATION)NEXT_ENTRY(query);
- }
-
- ea->NextEntryOffset = 0;
- args->buf_len -= remaining;
-out:
- if (args->ealist == NULL) { /* update the ea index */
- EnterCriticalSection(&state->ea.lock);
- state->ea.index = index;
- if (status == NO_ERROR && !args->overflow && !args->single) {
- /* listing was completed, free the cache */
- free(state->ea.list);
- state->ea.list = INVALID_HANDLE_VALUE;
- }
- LeaveCriticalSection(&state->ea.lock);
- }
- return status;
-
-out_free:
- free(args->buf);
- goto out;
-}
-
-static int marshall_getexattr(unsigned char *buffer, uint32_t *length, nfs41_upcall *upcall)
-{
- int status = NO_ERROR;
- getexattr_upcall_args *args = &upcall->args.getexattr;
-
- status = safe_write(&buffer, length, &args->overflow, sizeof(args->overflow));
- if (status) goto out;
- status = safe_write(&buffer, length, &args->buf_len, sizeof(args->buf_len));
- if (status) goto out;
- if (args->overflow == ERROR_INSUFFICIENT_BUFFER)
- goto out;
- status = safe_write(&buffer, length, args->buf, args->buf_len);
- if (status) goto out;
-out:
- free(args->buf);
- return status;
-}
-
-
-const nfs41_upcall_op nfs41_op_setexattr = {
- parse_setexattr,
- handle_setexattr,
- marshall_setexattr
-};
-
-const nfs41_upcall_op nfs41_op_getexattr = {
- parse_getexattr,
- handle_getexattr,
- marshall_getexattr
-};
projects / reactos.git / blobdiff