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0b903e1cf5
metze Autobuild-User(master): Stefan Metzmacher <metze@samba.org> Autobuild-Date(master): Mon Jul 23 16:22:03 CEST 2012 on sn-devel-104
720 lines
17 KiB
C
720 lines
17 KiB
C
/*
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Unix SMB/CIFS implementation.
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Files[] structure handling
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "smbd/smbd.h"
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#include "smbd/globals.h"
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#include "libcli/security/security.h"
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#include "util_tdb.h"
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#include <ccan/hash/hash.h>
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#include "lib/util/bitmap.h"
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#define FILE_HANDLE_OFFSET 0x1000
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/**
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* create new fsp to be used for file_new or a durable handle reconnect
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*/
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NTSTATUS fsp_new(struct connection_struct *conn, TALLOC_CTX *mem_ctx,
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files_struct **result)
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{
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NTSTATUS status = NT_STATUS_NO_MEMORY;
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files_struct *fsp = NULL;
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struct smbd_server_connection *sconn = conn->sconn;
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fsp = talloc_zero(mem_ctx, struct files_struct);
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if (fsp == NULL) {
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goto fail;
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}
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/*
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* This can't be a child of fsp because the file_handle can be ref'd
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* when doing a dos/fcb open, which will then share the file_handle
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* across multiple fsps.
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*/
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fsp->fh = talloc_zero(mem_ctx, struct fd_handle);
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if (fsp->fh == NULL) {
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goto fail;
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}
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fsp->fh->ref_count = 1;
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fsp->fh->fd = -1;
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fsp->fnum = FNUM_FIELD_INVALID;
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fsp->conn = conn;
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DLIST_ADD(sconn->files, fsp);
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sconn->num_files += 1;
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conn->num_files_open++;
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*result = fsp;
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return NT_STATUS_OK;
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fail:
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if (fsp != NULL) {
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TALLOC_FREE(fsp->fh);
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}
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TALLOC_FREE(fsp);
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return status;
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}
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/****************************************************************************
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Find first available file slot.
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****************************************************************************/
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NTSTATUS file_new(struct smb_request *req, connection_struct *conn,
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files_struct **result)
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{
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struct smbd_server_connection *sconn = conn->sconn;
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files_struct *fsp;
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NTSTATUS status;
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status = fsp_new(conn, conn, &fsp);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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GetTimeOfDay(&fsp->open_time);
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if (sconn->conn) {
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struct smbXsrv_open *op = NULL;
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NTTIME now = timeval_to_nttime(&fsp->open_time);
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status = smbXsrv_open_create(sconn->conn,
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conn->session_info,
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now, &op);
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if (!NT_STATUS_IS_OK(status)) {
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file_free(NULL, fsp);
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return status;
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}
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fsp->op = op;
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op->compat = fsp;
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fsp->fnum = op->local_id;
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fsp->fh->gen_id = smbXsrv_open_hash(op);
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}
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/*
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* Create an smb_filename with "" for the base_name. There are very
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* few NULL checks, so make sure it's initialized with something. to
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* be safe until an audit can be done.
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*/
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status = create_synthetic_smb_fname(fsp, "", NULL, NULL,
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&fsp->fsp_name);
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if (!NT_STATUS_IS_OK(status)) {
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file_free(NULL, fsp);
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return status;
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}
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DEBUG(5,("allocated file structure %s (%u used)\n",
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fsp_fnum_dbg(fsp), (unsigned int)sconn->num_files));
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if (req != NULL) {
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fsp->mid = req->mid;
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req->chain_fsp = fsp;
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}
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/* A new fsp invalidates the positive and
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negative fsp_fi_cache as the new fsp is pushed
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at the start of the list and we search from
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a cache hit to the *end* of the list. */
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ZERO_STRUCT(sconn->fsp_fi_cache);
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*result = fsp;
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return NT_STATUS_OK;
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}
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/****************************************************************************
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Close all open files for a connection.
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****************************************************************************/
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void file_close_conn(connection_struct *conn)
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{
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files_struct *fsp, *next;
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for (fsp=conn->sconn->files; fsp; fsp=next) {
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next = fsp->next;
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if (fsp->conn == conn) {
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close_file(NULL, fsp, SHUTDOWN_CLOSE);
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}
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}
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}
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/****************************************************************************
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Close all open files for a pid and a vuid.
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****************************************************************************/
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void file_close_pid(struct smbd_server_connection *sconn, uint16 smbpid,
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uint64_t vuid)
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{
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files_struct *fsp, *next;
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for (fsp=sconn->files;fsp;fsp=next) {
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next = fsp->next;
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if ((fsp->file_pid == smbpid) && (fsp->vuid == vuid)) {
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close_file(NULL, fsp, SHUTDOWN_CLOSE);
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}
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}
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}
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/****************************************************************************
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Initialise file structures.
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****************************************************************************/
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static int files_max_open_fds;
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bool file_init_global(void)
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{
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int request_max = lp_max_open_files();
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int real_lim;
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int real_max;
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if (files_max_open_fds != 0) {
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return true;
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}
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/*
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* Set the max_open files to be the requested
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* max plus a fudgefactor to allow for the extra
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* fd's we need such as log files etc...
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*/
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real_lim = set_maxfiles(request_max + MAX_OPEN_FUDGEFACTOR);
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real_max = real_lim - MAX_OPEN_FUDGEFACTOR;
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if (real_max + FILE_HANDLE_OFFSET + MAX_OPEN_PIPES > 65536) {
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real_max = 65536 - FILE_HANDLE_OFFSET - MAX_OPEN_PIPES;
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}
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if (real_max != request_max) {
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DEBUG(1, ("file_init_global: Information only: requested %d "
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"open files, %d are available.\n",
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request_max, real_max));
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}
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SMB_ASSERT(real_max > 100);
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files_max_open_fds = real_max;
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return true;
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}
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bool file_init(struct smbd_server_connection *sconn)
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{
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bool ok;
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ok = file_init_global();
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if (!ok) {
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return false;
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}
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sconn->real_max_open_files = files_max_open_fds;
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return true;
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}
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/****************************************************************************
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Close files open by a specified vuid.
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****************************************************************************/
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void file_close_user(struct smbd_server_connection *sconn, uint64_t vuid)
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{
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files_struct *fsp, *next;
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for (fsp=sconn->files; fsp; fsp=next) {
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next=fsp->next;
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if (fsp->vuid == vuid) {
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close_file(NULL, fsp, SHUTDOWN_CLOSE);
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}
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}
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}
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/*
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* Walk the files table until "fn" returns non-NULL
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*/
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struct files_struct *files_forall(
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struct smbd_server_connection *sconn,
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struct files_struct *(*fn)(struct files_struct *fsp,
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void *private_data),
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void *private_data)
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{
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struct files_struct *fsp, *next;
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for (fsp = sconn->files; fsp; fsp = next) {
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struct files_struct *ret;
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next = fsp->next;
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ret = fn(fsp, private_data);
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if (ret != NULL) {
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return ret;
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}
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}
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return NULL;
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}
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/****************************************************************************
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Find a fsp given a file descriptor.
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****************************************************************************/
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files_struct *file_find_fd(struct smbd_server_connection *sconn, int fd)
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{
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int count=0;
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files_struct *fsp;
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for (fsp=sconn->files; fsp; fsp=fsp->next,count++) {
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if (fsp->fh->fd == fd) {
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if (count > 10) {
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DLIST_PROMOTE(sconn->files, fsp);
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}
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return fsp;
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}
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}
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return NULL;
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}
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/****************************************************************************
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Find a fsp given a device, inode and file_id.
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****************************************************************************/
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files_struct *file_find_dif(struct smbd_server_connection *sconn,
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struct file_id id, unsigned long gen_id)
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{
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int count=0;
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files_struct *fsp;
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if (gen_id == 0) {
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return NULL;
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}
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for (fsp=sconn->files; fsp; fsp=fsp->next,count++) {
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/* We can have a fsp->fh->fd == -1 here as it could be a stat open. */
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if (file_id_equal(&fsp->file_id, &id) &&
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fsp->fh->gen_id == gen_id ) {
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if (count > 10) {
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DLIST_PROMOTE(sconn->files, fsp);
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}
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/* Paranoia check. */
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if ((fsp->fh->fd == -1) &&
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(fsp->oplock_type != NO_OPLOCK) &&
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(fsp->oplock_type != FAKE_LEVEL_II_OPLOCK)) {
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DEBUG(0,("file_find_dif: file %s file_id = "
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"%s, gen = %u oplock_type = %u is a "
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"stat open with oplock type !\n",
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fsp_str_dbg(fsp),
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file_id_string_tos(&fsp->file_id),
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(unsigned int)fsp->fh->gen_id,
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(unsigned int)fsp->oplock_type ));
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smb_panic("file_find_dif");
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}
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return fsp;
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}
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}
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return NULL;
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}
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/****************************************************************************
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Find the first fsp given a device and inode.
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We use a singleton cache here to speed up searching from getfilepathinfo
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calls.
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****************************************************************************/
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files_struct *file_find_di_first(struct smbd_server_connection *sconn,
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struct file_id id)
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{
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files_struct *fsp;
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if (file_id_equal(&sconn->fsp_fi_cache.id, &id)) {
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/* Positive or negative cache hit. */
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return sconn->fsp_fi_cache.fsp;
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}
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sconn->fsp_fi_cache.id = id;
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for (fsp=sconn->files;fsp;fsp=fsp->next) {
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if (file_id_equal(&fsp->file_id, &id)) {
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/* Setup positive cache. */
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sconn->fsp_fi_cache.fsp = fsp;
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return fsp;
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}
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}
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/* Setup negative cache. */
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sconn->fsp_fi_cache.fsp = NULL;
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return NULL;
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}
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/****************************************************************************
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Find the next fsp having the same device and inode.
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****************************************************************************/
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files_struct *file_find_di_next(files_struct *start_fsp)
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{
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files_struct *fsp;
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for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
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if (file_id_equal(&fsp->file_id, &start_fsp->file_id)) {
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return fsp;
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}
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}
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return NULL;
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}
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/****************************************************************************
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Find any fsp open with a pathname below that of an already open path.
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****************************************************************************/
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bool file_find_subpath(files_struct *dir_fsp)
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{
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files_struct *fsp;
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size_t dlen;
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char *d_fullname = NULL;
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d_fullname = talloc_asprintf(talloc_tos(), "%s/%s",
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dir_fsp->conn->connectpath,
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dir_fsp->fsp_name->base_name);
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if (!d_fullname) {
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return false;
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}
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dlen = strlen(d_fullname);
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for (fsp=dir_fsp->conn->sconn->files; fsp; fsp=fsp->next) {
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char *d1_fullname;
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if (fsp == dir_fsp) {
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continue;
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}
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d1_fullname = talloc_asprintf(talloc_tos(),
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"%s/%s",
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fsp->conn->connectpath,
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fsp->fsp_name->base_name);
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/*
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* If the open file has a path that is a longer
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* component, then it's a subpath.
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*/
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if (strnequal(d_fullname, d1_fullname, dlen) &&
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(d1_fullname[dlen] == '/')) {
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TALLOC_FREE(d1_fullname);
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TALLOC_FREE(d_fullname);
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return true;
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}
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TALLOC_FREE(d1_fullname);
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}
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TALLOC_FREE(d_fullname);
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return false;
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}
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/****************************************************************************
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Sync open files on a connection.
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****************************************************************************/
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void file_sync_all(connection_struct *conn)
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{
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files_struct *fsp, *next;
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for (fsp=conn->sconn->files; fsp; fsp=next) {
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next=fsp->next;
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if ((conn == fsp->conn) && (fsp->fh->fd != -1)) {
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sync_file(conn, fsp, True /* write through */);
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}
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}
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}
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/****************************************************************************
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Free up a fsp.
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****************************************************************************/
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void fsp_free(files_struct *fsp)
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{
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struct smbd_server_connection *sconn = fsp->conn->sconn;
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DLIST_REMOVE(sconn->files, fsp);
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SMB_ASSERT(sconn->num_files > 0);
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sconn->num_files--;
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TALLOC_FREE(fsp->fake_file_handle);
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if (fsp->fh->ref_count == 1) {
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TALLOC_FREE(fsp->fh);
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} else {
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fsp->fh->ref_count--;
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}
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fsp->conn->num_files_open--;
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/* this is paranoia, just in case someone tries to reuse the
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information */
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ZERO_STRUCTP(fsp);
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/* fsp->fsp_name is a talloc child and is free'd automatically. */
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TALLOC_FREE(fsp);
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}
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void file_free(struct smb_request *req, files_struct *fsp)
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{
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struct smbd_server_connection *sconn = fsp->conn->sconn;
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uint64_t fnum = fsp->fnum;
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if (fsp->notify) {
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struct notify_context *notify_ctx =
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fsp->conn->sconn->notify_ctx;
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notify_remove(notify_ctx, fsp);
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TALLOC_FREE(fsp->notify);
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}
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/* Ensure this event will never fire. */
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TALLOC_FREE(fsp->update_write_time_event);
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if (fsp->op != NULL) {
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fsp->op->compat = NULL;
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}
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TALLOC_FREE(fsp->op);
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if ((req != NULL) && (fsp == req->chain_fsp)) {
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req->chain_fsp = NULL;
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}
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/*
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* Clear all possible chained fsp
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* pointers in the SMB2 request queue.
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*/
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if (req != NULL && req->smb2req) {
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remove_smb2_chained_fsp(fsp);
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}
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/* Closing a file can invalidate the positive cache. */
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if (fsp == sconn->fsp_fi_cache.fsp) {
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ZERO_STRUCT(sconn->fsp_fi_cache);
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}
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/* Drop all remaining extensions. */
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vfs_remove_all_fsp_extensions(fsp);
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fsp_free(fsp);
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DEBUG(5,("freed files structure %llu (%u used)\n",
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(unsigned long long)fnum, (unsigned int)sconn->num_files));
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}
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/****************************************************************************
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Get an fsp from a packet given a 16 bit fnum.
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****************************************************************************/
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files_struct *file_fsp(struct smb_request *req, uint16 fid)
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{
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struct smbXsrv_open *op;
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NTSTATUS status;
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NTTIME now = 0;
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files_struct *fsp;
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if (req == NULL) {
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/*
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* We should never get here. req==NULL could in theory
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* only happen from internal opens with a non-zero
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* root_dir_fid. Internal opens just don't do that, at
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* least they are not supposed to do so. And if they
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* start to do so, they better fake up a smb_request
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* from which we get the right smbd_server_conn. While
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* this should never happen, let's return NULL here.
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*/
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return NULL;
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}
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if (req->chain_fsp != NULL) {
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if (req->chain_fsp->deferred_close) {
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return NULL;
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}
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return req->chain_fsp;
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}
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|
|
if (req->sconn->conn == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
now = timeval_to_nttime(&req->request_time);
|
|
|
|
status = smb1srv_open_lookup(req->sconn->conn,
|
|
fid, now, &op);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return NULL;
|
|
}
|
|
|
|
fsp = op->compat;
|
|
if (fsp == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
if (fsp->deferred_close) {
|
|
return NULL;
|
|
}
|
|
|
|
req->chain_fsp = fsp;
|
|
return fsp;
|
|
}
|
|
|
|
struct files_struct *file_fsp_smb2(struct smbd_smb2_request *smb2req,
|
|
uint64_t persistent_id,
|
|
uint64_t volatile_id)
|
|
{
|
|
struct smbXsrv_open *op;
|
|
NTSTATUS status;
|
|
NTTIME now = 0;
|
|
struct files_struct *fsp;
|
|
|
|
if (smb2req->compat_chain_fsp != NULL) {
|
|
if (smb2req->compat_chain_fsp->deferred_close) {
|
|
return NULL;
|
|
}
|
|
return smb2req->compat_chain_fsp;
|
|
}
|
|
|
|
now = timeval_to_nttime(&smb2req->request_time);
|
|
|
|
status = smb2srv_open_lookup(smb2req->sconn->conn,
|
|
persistent_id, volatile_id,
|
|
now, &op);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return NULL;
|
|
}
|
|
|
|
fsp = op->compat;
|
|
if (fsp == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
if (smb2req->tcon == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
if (smb2req->tcon->compat != fsp->conn) {
|
|
return NULL;
|
|
}
|
|
|
|
if (smb2req->session == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
if (smb2req->session->compat == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
if (smb2req->session->compat->vuid != fsp->vuid) {
|
|
return NULL;
|
|
}
|
|
|
|
if (fsp->deferred_close) {
|
|
return NULL;
|
|
}
|
|
|
|
smb2req->compat_chain_fsp = fsp;
|
|
return fsp;
|
|
}
|
|
|
|
/****************************************************************************
|
|
Duplicate the file handle part for a DOS or FCB open.
|
|
****************************************************************************/
|
|
|
|
NTSTATUS dup_file_fsp(struct smb_request *req, files_struct *from,
|
|
uint32 access_mask, uint32 share_access,
|
|
uint32 create_options, files_struct *to)
|
|
{
|
|
/* this can never happen for print files */
|
|
SMB_ASSERT(from->print_file == NULL);
|
|
|
|
TALLOC_FREE(to->fh);
|
|
|
|
to->fh = from->fh;
|
|
to->fh->ref_count++;
|
|
|
|
to->file_id = from->file_id;
|
|
to->initial_allocation_size = from->initial_allocation_size;
|
|
to->file_pid = from->file_pid;
|
|
to->vuid = from->vuid;
|
|
to->open_time = from->open_time;
|
|
to->access_mask = access_mask;
|
|
to->share_access = share_access;
|
|
to->oplock_type = from->oplock_type;
|
|
to->can_lock = from->can_lock;
|
|
to->can_read = ((access_mask & FILE_READ_DATA) != 0);
|
|
to->can_write =
|
|
CAN_WRITE(from->conn) &&
|
|
((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
|
|
to->modified = from->modified;
|
|
to->is_directory = from->is_directory;
|
|
to->aio_write_behind = from->aio_write_behind;
|
|
|
|
return fsp_set_smb_fname(to, from->fsp_name);
|
|
}
|
|
|
|
/**
|
|
* Return a jenkins hash of a pathname on a connection.
|
|
*/
|
|
|
|
NTSTATUS file_name_hash(connection_struct *conn,
|
|
const char *name, uint32_t *p_name_hash)
|
|
{
|
|
char *fullpath = NULL;
|
|
|
|
/* Set the hash of the full pathname. */
|
|
fullpath = talloc_asprintf(talloc_tos(),
|
|
"%s/%s",
|
|
conn->connectpath,
|
|
name);
|
|
if (!fullpath) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
*p_name_hash = hash(fullpath, talloc_get_size(fullpath), 0);
|
|
|
|
DEBUG(10,("file_name_hash: %s hash 0x%x\n",
|
|
fullpath,
|
|
(unsigned int)*p_name_hash ));
|
|
|
|
TALLOC_FREE(fullpath);
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/**
|
|
* The only way that the fsp->fsp_name field should ever be set.
|
|
*/
|
|
NTSTATUS fsp_set_smb_fname(struct files_struct *fsp,
|
|
const struct smb_filename *smb_fname_in)
|
|
{
|
|
NTSTATUS status;
|
|
struct smb_filename *smb_fname_new;
|
|
|
|
status = copy_smb_filename(fsp, smb_fname_in, &smb_fname_new);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
TALLOC_FREE(fsp->fsp_name);
|
|
fsp->fsp_name = smb_fname_new;
|
|
|
|
return file_name_hash(fsp->conn,
|
|
smb_fname_str_dbg(fsp->fsp_name),
|
|
&fsp->name_hash);
|
|
}
|