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xrdp/sesman/chansrv/chansrv_fuse.c

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Laxmikant Rashinkar 2013 LK.Rashinkar@gmail.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* FUSE mount point */
char g_fuse_root_path[256] = "";
char g_fuse_clipboard_path[256] = ""; /* for clipboard use */
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#ifndef XRDP_FUSE
/******************************************************************************
** **
** when FUSE is NOT enabled in xrdp **
** **
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "arch.h"
#include "chansrv_fuse.h"
#include "chansrv_xfs.h"
/* dummy calls when XRDP_FUSE is not defined */
int xfuse_init(void) { return 0; }
int xfuse_deinit(void) { return 0; }
int xfuse_check_wait_objs(void) { return 0; }
int xfuse_get_wait_objs(tbus *objs, int *count, int *timeout) { return 0; }
int xfuse_create_share(tui32 device_id, const char *dirname) { return 0; }
void xfuse_delete_share(tui32 share_id) {}
int xfuse_clear_clip_dir(void) { return 0; }
int xfuse_file_contents_range(int stream_id, const char *data, int data_bytes) { return 0; }
int xfuse_file_contents_size(int stream_id, int file_size)
{ return 0; }
int xfuse_add_clip_dir_item(const char *filename,
int flags, int size, int lindex) { return 0; }
void xfuse_devredir_cb_enum_dir_add_entry(
struct state_dirscan *fip,
const char *name,
const struct file_attr *fattr)
{}
void xfuse_devredir_cb_enum_dir_done(struct state_dirscan *fip,
enum NTSTATUS IoStatus)
{}
void xfuse_devredir_cb_lookup_entry(struct state_lookup *fip,
enum NTSTATUS IoStatus,
const struct file_attr *file_info)
{}
void xfuse_devredir_cb_setattr(struct state_setattr *fip,
enum NTSTATUS IoStatus)
{}
void xfuse_devredir_cb_create_file(struct state_create *fip,
enum NTSTATUS IoStatus,
tui32 DeviceId, tui32 FileId)
{}
void xfuse_devredir_cb_open_file(struct state_open *fip,
enum NTSTATUS IoStatus,
tui32 DeviceId, tui32 FileId)
{}
void xfuse_devredir_cb_read_file(struct state_read *fip,
enum NTSTATUS IoStatus,
const char *buf, size_t length)
{}
void xfuse_devredir_cb_write_file(
struct state_write *fip,
enum NTSTATUS IoStatus,
off_t offset,
size_t length)
{}
void xfuse_devredir_cb_rmdir_or_file(struct state_remove *fip,
enum NTSTATUS IoStatus)
{}
void xfuse_devredir_cb_rename_file(struct state_rename *fip,
enum NTSTATUS IoStatus)
{}
void xfuse_devredir_cb_file_close(struct state_close *fip)
{}
#else
/******************************************************************************
** **
** when FUSE is enabled in xrdp **
** **
******************************************************************************/
#define FUSE_USE_VERSION 26
#include <fuse_lowlevel.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <sched.h>
#include "arch.h"
#include "os_calls.h"
#include "clipboard_file.h"
#include "chansrv_fuse.h"
#include "chansrv_xfs.h"
#include "devredir.h"
#include "list.h"
#include "file.h"
#ifndef EREMOTEIO
#define EREMOTEIO EIO
#endif
#define XFUSE_ATTR_TIMEOUT 5.0
#define XFUSE_ENTRY_TIMEOUT 5.0
/* module based logging */
#define LOG_ERROR 0
#define LOG_INFO 1
#define LOG_DEBUG 2
#ifndef LOG_LEVEL
#define LOG_LEVEL LOG_ERROR
#endif
#define log_error(_params...) \
{ \
g_write("[%10.10u]: FUSE %s: %d : ERROR: ", \
g_time3(), __func__, __LINE__); \
g_writeln (_params); \
}
#define log_always(_params...) \
{ \
g_write("[%10.10u]: FUSE %s: %d : ALWAYS: ", \
g_time3(), __func__, __LINE__); \
g_writeln (_params); \
}
#define log_info(_params...) \
{ \
if (LOG_INFO <= LOG_LEVEL) \
{ \
g_write("[%10.10u]: FUSE %s: %d : ", \
g_time3(), __func__, __LINE__); \
g_writeln (_params); \
} \
}
#define log_debug(_params...) \
{ \
if (LOG_DEBUG <= LOG_LEVEL) \
{ \
g_write("[%10.10u]: FUSE %s: %d : ", \
g_time3(), __func__, __LINE__); \
g_writeln (_params); \
} \
}
/* Type of buffer used for fuse_add_direntry() calls */
struct dirbuf1
{
char buf[4096];
size_t len;
};
/*
* Record type used to maintain state when running a directory scan
*/
struct state_dirscan
{
fuse_req_t req; /* Original FUSE request from opendir */
struct fuse_file_info fi; /* File info struct passed to opendir */
fuse_ino_t pinum; /* inum of parent directory */
};
/*
* Record type used to maintain state when running an entry lookup
*/
struct state_lookup
{
fuse_req_t req; /* Original FUSE request from lookup */
fuse_ino_t pinum; /* inum of parent directory */
char name[XFS_MAXFILENAMELEN];
/* Name to look up */
fuse_ino_t existing_inum;
/* inum of an existing entry */
tui32 existing_generation;
/* generation of the above */
};
/*
* Record type used to maintain state when running an entry setattr
*/
struct state_setattr
{
fuse_req_t req; /* Original FUSE request from lookup */
fuse_ino_t inum; /* inum of entry */
struct file_attr fattr; /* File attributes to set */
tui32 change_mask; /* Attributes to set in fattr */
};
/*
* Record type used to maintain state when running an open
*/
struct state_open
{
fuse_req_t req; /* Original FUSE request from lookup */
struct fuse_file_info fi; /* File info struct passed to open */
fuse_ino_t inum; /* inum of file to open */
};
/*
* Record type used to maintain state when running a create
*/
struct state_create
{
fuse_req_t req; /* Original FUSE request from lookup */
struct fuse_file_info fi; /* File info struct passed to open */
fuse_ino_t pinum; /* inum of parent directory */
char name[XFS_MAXFILENAMELEN];
/* Name of file in parent directory */
mode_t mode; /* Mode of file to create */
};
/*
* Record type used to maintain state when running a read
*/
struct state_read
{
fuse_req_t req; /* Original FUSE request from lookup */
};
/*
* Record type used to maintain state when running a write
*/
struct state_write
{
fuse_req_t req; /* Original FUSE request from lookup */
fuse_ino_t inum; /* inum of file we're writing */
};
/*
* Record type used to maintain state when running a remove
*/
struct state_remove
{
fuse_req_t req; /* Original FUSE request from lookup */
fuse_ino_t inum; /* inum of file we're removing */
};
/*
* Record type used to maintain state when running a rename
*/
struct state_rename
{
fuse_req_t req; /* Original FUSE request from lookup */
fuse_ino_t pinum; /* inum of parent of file */
fuse_ino_t new_pinum; /* inum of new parent of file */
char name[XFS_MAXFILENAMELEN];
/* New name of file in new parent dir */
};
/*
* Record type used to maintain state when running a close
*/
struct state_close
{
fuse_req_t req; /* Original FUSE request from lookup */
struct fuse_file_info fi; /* File info struct passed to open */
fuse_ino_t inum; /* inum of file to open */
};
struct xfuse_handle
{
tui32 DeviceId;
tui32 FileId;
int is_loc_resource; /* this is not a redirected resource */
};
typedef struct xfuse_handle XFUSE_HANDLE;
/* used for file data request sent to client */
struct req_list_item
{
fuse_req_t req;
int stream_id;
int lindex;
int off;
int size;
};
static char g_fuse_mount_name[256] = "xrdp_client";
static mode_t g_umask = 077; /* Umask for files in fs */
static struct list *g_req_list = 0;
static struct xfs_fs *g_xfs; /* an inst of xrdp file system */
static ino_t g_clipboard_inum; /* inode of clipboard dir */
static char *g_mount_point = 0; /* our FUSE mount point */
static struct fuse_lowlevel_ops g_xfuse_ops; /* setup FUSE callbacks */
static int g_xfuse_inited = 0; /* true when FUSE is inited */
static struct fuse_chan *g_ch = 0;
static struct fuse_session *g_se = 0;
static char *g_buffer = 0;
static int g_fd = 0;
static tintptr g_bufsize = 0;
/* forward declarations for internal access */
static int xfuse_init_xrdp_fs(void);
static int xfuse_deinit_xrdp_fs(void);
static int xfuse_init_lib(struct fuse_args *args);
/* forward declarations for FUSE callbacks */
static void xfuse_cb_lookup(fuse_req_t req, fuse_ino_t parent,
const char *name);
static void xfuse_cb_getattr(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi);
/* this is not a callback, but it's used by xfuse_cb_readdir() */
static int xfuse_dirbuf_add1(fuse_req_t req, struct dirbuf1 *b,
XFS_INODE *xinode, off_t offset);
static void xfuse_cb_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi);
static void xfuse_cb_mkdir(fuse_req_t req, fuse_ino_t parent,
const char *name, mode_t mode);
static void xfuse_cb_unlink(fuse_req_t req, fuse_ino_t parent,
const char *name);
static void xfuse_cb_rename(fuse_req_t req,
fuse_ino_t old_parent, const char *old_name,
fuse_ino_t new_parent, const char *new_name);
/* Whether to create a dir of file depends on whether S_IFDIR is set in the
mode field */
static void xfuse_create_dir_or_file(fuse_req_t req, fuse_ino_t parent,
const char *name, mode_t mode,
struct fuse_file_info *fi);
static void xfuse_cb_open(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi);
static void xfuse_cb_release(fuse_req_t req, fuse_ino_t ino, struct
fuse_file_info *fi);
static void xfuse_cb_read(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi);
static void xfuse_cb_write(fuse_req_t req, fuse_ino_t ino, const char *buf,
size_t size, off_t off, struct fuse_file_info *fi);
static void xfuse_cb_create(fuse_req_t req, fuse_ino_t parent,
const char *name, mode_t mode,
struct fuse_file_info *fi);
#if 0
static void xfuse_cb_fsync(fuse_req_t req, fuse_ino_t ino, int datasync,
struct fuse_file_info *fi);
#endif
static void xfuse_cb_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
int to_set, struct fuse_file_info *fi);
static void xfuse_cb_opendir(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi);
static void xfuse_cb_releasedir(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi);
/* miscellaneous functions */
static void xfs_inode_to_fuse_entry_param(const XFS_INODE *xinode,
struct fuse_entry_param *e);
static void make_fuse_entry_reply(fuse_req_t req, const XFS_INODE *xinode);
static void make_fuse_attr_reply(fuse_req_t req, const XFS_INODE *xinode);
static const char *filename_on_device(const char *full_path);
static void update_inode_file_attributes(const struct file_attr *fattr,
tui32 change_mask, XFS_INODE *xinode);
static char *get_name_for_entry_in_parent(fuse_ino_t parent, const char *name);
/*****************************************************************************/
int
load_fuse_config(void)
{
int index;
char cfg_file[256];
struct list *items;
struct list *values;
char *item;
char *value;
items = list_create();
items->auto_free = 1;
values = list_create();
values->auto_free = 1;
g_snprintf(cfg_file, 255, "%s/sesman.ini", XRDP_CFG_PATH);
file_by_name_read_section(cfg_file, "Chansrv", items, values);
for (index = 0; index < items->count; index++)
{
item = (char *)list_get_item(items, index);
value = (char *)list_get_item(values, index);
if (g_strcasecmp(item, "FuseMountName") == 0)
{
g_strncpy(g_fuse_mount_name, value, 255);
}
else if (g_strcasecmp(item, "FileUmask") == 0)
{
g_umask = strtol(value, NULL, 0);
log_info("g_umask set to 0%o", g_umask);
}
}
list_delete(items);
list_delete(values);
return 0;
}
/*****************************************************************************
** **
** public functions - can be called from any code path **
** **
*****************************************************************************/
/**
* Initialize FUSE subsystem
*
* @return 0 on success, -1 on failure
*****************************************************************************/
int
xfuse_init(void)
{
struct fuse_args args = FUSE_ARGS_INIT(0, NULL);
/* if already inited, just return */
if (g_xfuse_inited)
{
log_debug("already inited");
return 1;
}
if (g_ch != 0)
{
log_error("g_ch is not zero");
return -1;
}
load_fuse_config();
/* define FUSE mount point to ~/xrdp_client, ~/thinclient_drives */
g_snprintf(g_fuse_root_path, 255, "%s/%s", g_getenv("HOME"), g_fuse_mount_name);
g_snprintf(g_fuse_clipboard_path, 255, "%s/.clipboard", g_fuse_root_path);
/* if FUSE mount point does not exist, create it */
if (!g_directory_exist(g_fuse_root_path))
{
if (!g_create_dir(g_fuse_root_path))
{
log_error("mkdir %s failed. If %s is already mounted, you must "
"first unmount it", g_fuse_root_path, g_fuse_root_path);
return -1;
}
}
/* setup xrdp file system */
if (xfuse_init_xrdp_fs())
return -1;
/* setup FUSE callbacks */
g_memset(&g_xfuse_ops, 0, sizeof(g_xfuse_ops));
g_xfuse_ops.lookup = xfuse_cb_lookup;
g_xfuse_ops.readdir = xfuse_cb_readdir;
g_xfuse_ops.mkdir = xfuse_cb_mkdir;
g_xfuse_ops.rmdir = xfuse_cb_unlink;
g_xfuse_ops.unlink = xfuse_cb_unlink;
g_xfuse_ops.rename = xfuse_cb_rename;
g_xfuse_ops.open = xfuse_cb_open;
g_xfuse_ops.release = xfuse_cb_release;
g_xfuse_ops.read = xfuse_cb_read;
g_xfuse_ops.write = xfuse_cb_write;
g_xfuse_ops.create = xfuse_cb_create;
//g_xfuse_ops.fsync = xfuse_cb_fsync; /* LK_TODO delete this */
g_xfuse_ops.getattr = xfuse_cb_getattr;
g_xfuse_ops.setattr = xfuse_cb_setattr;
g_xfuse_ops.opendir = xfuse_cb_opendir;
g_xfuse_ops.releasedir = xfuse_cb_releasedir;
fuse_opt_add_arg(&args, "xrdp-chansrv");
fuse_opt_add_arg(&args, g_fuse_root_path);
//fuse_opt_add_arg(&args, "-s"); /* single threaded mode */
//fuse_opt_add_arg(&args, "-d"); /* debug mode */
if (xfuse_init_lib(&args))
{
xfuse_deinit();
return -1;
}
g_xfuse_inited = 1;
return 0;
}
/**
* De-initialize FUSE subsystem
*
* @return 0 on success, -1 on failure
*****************************************************************************/
int
xfuse_deinit(void)
{
if (g_ch != 0)
{
fuse_session_remove_chan(g_ch);
fuse_unmount(g_mount_point, g_ch);
g_ch = 0;
}
if (g_se != 0)
{
fuse_session_destroy(g_se);
g_se = 0;
}
if (g_buffer != 0)
{
g_free(g_buffer);
g_buffer = 0;
}
if (g_req_list != 0)
{
list_delete(g_req_list);
g_req_list = 0;
}
xfuse_deinit_xrdp_fs();
g_xfuse_inited = 0;
return 0;
}
/**
*
*
* @return 0 on success, -1 on failure
*****************************************************************************/
int xfuse_check_wait_objs(void)
{
struct fuse_chan *tmpch;
int rval;
if (g_ch == 0)
return 0;
if (g_tcp_select(g_fd, 0) & 1)
{
tmpch = g_ch;
rval = fuse_chan_recv(&tmpch, g_buffer, g_bufsize);
if (rval == -EINTR)
return -1;
if (rval == -ENODEV)
return -1;
if (rval <= 0)
return -1;
fuse_session_process(g_se, g_buffer, rval, tmpch);
}
return 0;
}
/**
*
*
* @return 0 on success, -1 on failure
*****************************************************************************/
int xfuse_get_wait_objs(tbus *objs, int *count, int *timeout)
{
int lcount;
if (g_ch == 0)
return 0;
lcount = *count;
objs[lcount] = g_fd;
lcount++;
*count = lcount;
return 0;
}
/**
* @brief Create specified share directory.
*
* This code gets called from devredir
*
* @return 0 on success, -1 on failure
*****************************************************************************/
int xfuse_create_share(tui32 device_id, const char *dirname)
{
int result = -1;
XFS_INODE *xinode;
if (dirname != NULL && strlen(dirname) > 0 &&
xfuse_init_xrdp_fs() == 0)
{
xinode = xfs_add_entry(g_xfs, FUSE_ROOT_ID, dirname, (0777 | S_IFDIR));
if (xinode == NULL)
{
log_debug("xfs_add_entry() failed");
}
else
{
xinode->is_redirected = 1;
xinode->device_id = device_id;
result = 0;
}
}
return result;
}
/**
* @brief Remove specified share directory.
*
* This code gets called from devredir
*****************************************************************************/
void xfuse_delete_share(tui32 device_id)
{
xfs_delete_redirected_entries_with_device_id(g_xfs, device_id);
}
/**
* Clear all clipboard entries in xrdp_fs
*
* This function is called by clipboard code
*
* @return 0 on success, -1 on failure
*****************************************************************************/
int xfuse_clear_clip_dir(void)
{
int result = 0;
if (g_xfs != NULL && g_clipboard_inum > 0)
{
xfs_remove_directory_contents(g_xfs, g_clipboard_inum);
}
return result;
}
/**
* Return clipboard data to fuse
*
* @return 0 on success, -1 on failure
*****************************************************************************/
int
xfuse_file_contents_range(int stream_id, const char *data, int data_bytes)
{
log_debug("entered: stream_id=%d data_bytes=%d", stream_id, data_bytes);
struct req_list_item *rli;
if ((rli = (struct req_list_item *) list_get_item(g_req_list, 0)) == NULL)
{
log_error("range error!");
return -1;
}
log_debug("lindex=%d off=%d size=%d", rli->lindex, rli->off, rli->size);
fuse_reply_buf(rli->req, data, data_bytes);
list_remove_item(g_req_list, 0);
if (g_req_list->count <= 0)
{
log_debug("completed all requests");
return 0;
}
/* send next request */
rli = (struct req_list_item *) list_get_item(g_req_list, 0);
if (rli == NULL)
{
log_error("range error!");
return -1;
}
log_debug("requesting clipboard file data");
clipboard_request_file_data(rli->stream_id, rli->lindex,
rli->off, rli->size);
return 0;
}
/**
* Create a file in .clipboard dir
*
* This function is called by clipboard code
*
* @return 0 on success, -1 on failure
*****************************************************************************/
int
xfuse_add_clip_dir_item(const char *filename, int flags, int size, int lindex)
{
log_debug("entered: filename=%s flags=%d size=%d lindex=%d",
filename, flags, size, lindex);
/* add entry to xrdp_fs */
XFS_INODE *xinode = xfs_add_entry( g_xfs,
g_clipboard_inum, /* parent inode */
filename,
(0666 | S_IFREG));
if (xinode == NULL)
{
log_debug("failed to create file in xrdp filesystem");
return -1;
}
xinode->size = size;
xinode->lindex = lindex;
return 0;
}
/**
*
*
* @return 0 on success, -1 on failure
*****************************************************************************/
int xfuse_file_contents_size(int stream_id, int file_size)
{
log_debug("entered: stream_id=%d file_size=%d", stream_id, file_size);
return 0;
}
/*****************************************************************************
** **
** private functions - can only be called from within this file **
** **
*****************************************************************************/
/**
* Initialize FUSE library
*
* @return 0 on success, -1 on failure
*****************************************************************************/
static int xfuse_init_lib(struct fuse_args *args)
{
if (fuse_parse_cmdline(args, &g_mount_point, 0, 0) < 0)
{
log_error("fuse_parse_cmdline() failed");
fuse_opt_free_args(args);
return -1;
}
if ((g_ch = fuse_mount(g_mount_point, args)) == 0)
{
log_error("fuse_mount() failed");
fuse_opt_free_args(args);
return -1;
}
g_se = fuse_lowlevel_new(args, &g_xfuse_ops, sizeof(g_xfuse_ops), 0);
if (g_se == 0)
{
log_error("fuse_lowlevel_new() failed");
fuse_unmount(g_mount_point, g_ch);
g_ch = 0;
fuse_opt_free_args(args);
return -1;
}
fuse_opt_free_args(args);
fuse_session_add_chan(g_se, g_ch);
g_bufsize = fuse_chan_bufsize(g_ch);
g_buffer = g_new0(char, g_bufsize);
g_fd = fuse_chan_fd(g_ch);
g_req_list = list_create();
g_req_list->auto_free = 1;
return 0;
}
/**
* Initialize xrdp file system
*
* @return 0 on success, -1 on failure
*
*****************************************************************************/
static int xfuse_init_xrdp_fs(void)
{
XFS_INODE *xino;
int result = -1;
/* Already called? */
if (g_xfs != NULL)
{
result = 0;
}
else if ((g_xfs = xfs_create_xfs_fs(0, g_getuid(), g_getgid())) == NULL)
{
log_error("system out of memory");
}
else
{
/* Need a top-level .clipboard directory */
xino = xfs_add_entry(g_xfs, FUSE_ROOT_ID, ".clipboard",
(0777 | S_IFDIR));
if (xino == NULL)
{
log_error("system out of memory");
xfs_delete_xfs_fs(g_xfs);
g_xfs = NULL;
}
else
{
g_clipboard_inum = xino->inum;
result = 0;
}
}
return result;
}
/**
* zap the xrdp file system
*
* @return 0 on success, -1 on failure
*****************************************************************************/
static int xfuse_deinit_xrdp_fs(void)
{
xfs_delete_xfs_fs(g_xfs);
g_xfs = NULL;
g_clipboard_inum = 0;
return 0;
}
/******************************************************************************
** **
** callbacks for devredir **
** **
******************************************************************************/
/**
* Add a file or directory to xrdp file system as part of a
* directory request
*
* If the file or directory already exists, no changes are made to it.
*****************************************************************************/
void xfuse_devredir_cb_enum_dir_add_entry(
struct state_dirscan *fip,
const char *name,
const struct file_attr *fattr)
{
XFS_INODE *xinode = NULL;
if (!xfs_get(g_xfs, fip->pinum))
{
log_error("inode %ld is not valid", fip->pinum);
}
else if ((strcmp(name, ".") == 0) ||
(strcmp(name, "..") == 0))
{
; /* filename is . or .. - don't add it */
}
else
{
log_debug("parent_inode=%ld name=%s", fip->pinum, name);
/* Does the file already exist ? If it does it's important we
* don't mess with it, as we're only enumerating the directory, and
* we don't want to disrupt any existing operations on the file
*/
xinode = xfs_lookup_in_dir(g_xfs, fip->pinum, name);
if (xinode == NULL)
{
/* Add a new node to the file system */
log_debug("Creating name=%s in parent=%ld in xrdp_fs",
name, fip->pinum);
xinode = xfs_add_entry(g_xfs, fip->pinum, name, fattr->mode);
if (xinode == NULL)
{
log_error("xfs_add_entry() failed");
}
else
{
xinode->size = fattr->size;
xinode->atime = fattr->atime;
xinode->mtime = fattr->mtime;
/* Initially, set the attribute change time to the file data
change time */
xinode->ctime = fattr->mtime;
/* device_id is inherited from parent */
}
}
}
}
/**
* This routine is called by devredir when the opendir request has
* completed
*****************************************************************************/
void xfuse_devredir_cb_enum_dir_done(struct state_dirscan *fip,
enum NTSTATUS IoStatus)
{
log_debug("fip=%p IoStatus=0x%x", fip, IoStatus);
/*
* STATUS_NO_SUCH_FILE is returned for empty directories
*/
if (IoStatus != STATUS_SUCCESS && IoStatus != STATUS_NO_SUCH_FILE)
{
int status;
switch (IoStatus)
{
case STATUS_ACCESS_DENIED:
status = EACCES;
break;
default:
status = ENOENT;
}
fuse_reply_err(fip->req, status);
}
else if (!xfs_get(g_xfs, fip->pinum))
{
log_error("inode %ld is not valid", fip->pinum);
fuse_reply_err(fip->req, ENOENT);
}
else
{
struct fuse_file_info *fi = &fip->fi;
if ((fi->fh = (tintptr) xfs_opendir(g_xfs, fip->pinum)) == 0)
{
fuse_reply_err(fip->req, ENOMEM);
}
else
{
fuse_reply_open(fip->req, &fip->fi);
}
}
free(fip);
}
/**
* This routine is caused as a result of a devredir remote lookup
* instigated by xfuse_cb_lookup()
*****************************************************************************/
void xfuse_devredir_cb_lookup_entry(struct state_lookup *fip,
enum NTSTATUS IoStatus,
const struct file_attr *file_info)
{
XFS_INODE *xinode = NULL;
if (IoStatus != STATUS_SUCCESS)
{
switch (IoStatus)
{
case STATUS_SHARING_VIOLATION:
/* This can happen when trying to read the attributes of
* some system files (e.g. pagefile.sys) */
case STATUS_ACCESS_DENIED:
fuse_reply_err(fip->req, EACCES);
break;
case STATUS_UNSUCCESSFUL:
/* Happens if we try to lookup an illegal filename (e.g.
* one with a '*' in it) */
fuse_reply_err(fip->req, ENOENT);
break;
case STATUS_NO_SUCH_FILE:
/* Remove our copy, if any */
if (fip->existing_inum &&
(xinode = xfs_get(g_xfs, fip->existing_inum)) != NULL &&
xinode->generation == fip->existing_generation)
{
xfs_remove_entry(g_xfs, fip->existing_inum);
}
fuse_reply_err(fip->req, ENOENT);
break;
default:
log_info("Error code %08x - fallthrough", (int) IoStatus);
fuse_reply_err(fip->req, EIO);
break;
}
}
else if (!xfs_get(g_xfs, fip->pinum))
{
log_error("parent inode %ld is not valid", fip->pinum);
fuse_reply_err(fip->req, ENOENT);
}
else
{
log_debug("parent_inode=%ld name=%s", fip->pinum, fip->name);
/* Does the file already exist ? */
xinode = xfs_lookup_in_dir(g_xfs, fip->pinum, fip->name);
if (xinode != NULL)
{
/* Is the existing file the same type ? */
if ((xinode->mode & (S_IFREG | S_IFDIR)) ==
(file_info->mode & (S_IFREG | S_IFDIR)))
{
log_debug("inode=%ld name=%s already exists in xrdp_fs as %ld",
fip->pinum, fip->name, xinode->inum);
if (xfs_get_file_open_count(g_xfs, xinode->inum) > 0)
{
/*
* Don't mess with open files. The local attributes are
* almost certainly more up-to-date. A worst case scenario
* would be truncating a file we're currently writing
* to, as the lookup value for the size is stale.
*/
log_debug("inode=%ld is open - "
"preferring local attributes", xinode->inum);
}
else
{
log_debug("Updating attributes of inode=%ld", xinode->inum);
update_inode_file_attributes(file_info, TO_SET_ALL, xinode);
}
}
else
{
/* Type has changed from file to directory, or vice-versa */
log_debug("inode=%ld name=%s of different type in xrdp_fs"
" - removing",
fip->pinum, xinode->name);
xfs_remove_entry(g_xfs, xinode->inum);
xinode = NULL;
}
}
if (xinode == NULL)
{
/* Add a new node to the file system */
log_debug("Creating name=%s in parent=%ld in xrdp_fs",
fip->name, fip->pinum);
xinode = xfs_add_entry(g_xfs, fip->pinum, fip->name,
file_info->mode);
if (xinode == NULL)
{
log_debug("xfs_add_entry() failed");
}
else
{
xinode->size = file_info->size;
xinode->atime = file_info->atime;
xinode->mtime = file_info->mtime;
/* Initially, set the attribute change time to the file data
change time */
xinode->ctime = file_info->mtime;
/* device_id is inherited from parent */
}
}
if (xinode != NULL)
{
make_fuse_entry_reply(fip->req, xinode);
}
else
{
fuse_reply_err(fip->req, EIO);
}
}
free(fip);
}
/**
* This routine is caused as a result of a devredir remote setattr
* instigated by xfuse_cb_setattr()
*****************************************************************************/
void xfuse_devredir_cb_setattr(struct state_setattr *fip,
enum NTSTATUS IoStatus)
{
XFS_INODE *xinode;
if (IoStatus != STATUS_SUCCESS)
{
switch (IoStatus)
{
case STATUS_SHARING_VIOLATION:
/* This can happen when trying to read the attributes of
* some system files (e.g. pagefile.sys) */
case STATUS_ACCESS_DENIED:
fuse_reply_err(fip->req, EACCES);
break;
case STATUS_UNSUCCESSFUL:
/* Happens if we try to lookup an illegal filename */
case STATUS_NO_SUCH_FILE:
fuse_reply_err(fip->req, ENOENT);
break;
default:
log_info("Error code %08x - fallthrough", (int) IoStatus);
fuse_reply_err(fip->req, EIO);
break;
}
}
else if ((xinode = xfs_get(g_xfs, fip->inum)) == NULL)
{
fuse_reply_err(fip->req, ENOENT);
}
else
{
update_inode_file_attributes(&fip->fattr, fip->change_mask, xinode);
make_fuse_attr_reply(fip->req, xinode);
}
free(fip);
}
/**
* This routine is caused as a result of a file or directory
* create request */
void xfuse_devredir_cb_create_file(struct state_create *fip,
enum NTSTATUS IoStatus,
tui32 DeviceId, tui32 FileId)
{
XFUSE_HANDLE *fh = NULL;
if (IoStatus != 0)
{
switch (IoStatus)
{
case STATUS_ACCESS_DENIED:
fuse_reply_err(fip->req, EACCES);
break;
case STATUS_OBJECT_NAME_INVALID:
case STATUS_OBJECT_NAME_NOT_FOUND:
fuse_reply_err(fip->req, ENOENT);
break;
default:
fuse_reply_err(fip->req, EIO);
break;
}
}
else
{
if ((fip->mode & S_IFREG) != 0)
{
/* We've created a regular file */
/* Allocate an XFUSE_HANDLE for future file operations */
if ((fh = g_new0(XFUSE_HANDLE, 1)) != NULL)
{
/* save file handle for later use */
fh->DeviceId = DeviceId;
fh->FileId = FileId;
fip->fi.fh = (tintptr) fh;
}
}
if ((fip->mode & S_IFREG) != 0 && fh == NULL)
{
/* We failed to allocate a file handle */
log_error("system out of memory");
fuse_reply_err(fip->req, ENOMEM);
}
else
{
XFS_INODE *xinode;
/* create entry in xrdp file system */
xinode = xfs_add_entry(g_xfs, fip->pinum, fip->name, fip->mode);
if (xinode == NULL)
{
/* It's possible xfs_add_entry() has failed, as the
* file has already been added (by a lookup request)
* in the time between our request and the response
* This can happen if an 'ls' is happening in the same
* directory as this file is being created.
*
* We'll check for this before we fail the create */
if ((xinode = xfs_lookup_in_dir(g_xfs,
fip->pinum,
fip->name)) != NULL)
{
/*
* The mode should be correct anyway, but we'll
* set it to the mode requested at creation
*/
xinode->mode = fip->mode;
}
}
if (xinode == NULL)
{
log_error("Out of memory!");
fuse_reply_err(fip->req, ENOMEM);
}
else
{
if ((fip->mode & S_IFDIR) != 0)
{
make_fuse_entry_reply(fip->req, xinode);
}
else
{
struct fuse_entry_param e;
xfs_inode_to_fuse_entry_param(xinode, &e);
fuse_reply_create(fip->req, &e, &fip->fi);
xfs_increment_file_open_count(g_xfs, xinode->inum);
}
}
}
}
free(fip);
}
/**
* This routine is caused as a result of a file open request */
void xfuse_devredir_cb_open_file(struct state_open *fip,
enum NTSTATUS IoStatus,
tui32 DeviceId, tui32 FileId)
{
XFUSE_HANDLE *fh;
if (IoStatus != 0)
{
switch (IoStatus)
{
case STATUS_ACCESS_DENIED:
fuse_reply_err(fip->req, EACCES);
break;
case STATUS_OBJECT_NAME_INVALID:
case STATUS_OBJECT_NAME_NOT_FOUND:
fuse_reply_err(fip->req, ENOENT);
break;
default:
fuse_reply_err(fip->req, EIO);
break;
}
}
else
{
/* Allocate an XFUSE_HANDLE for future file operations */
if ((fh = g_new0(XFUSE_HANDLE, 1)) == NULL)
{
log_error("system out of memory");
fuse_reply_err(fip->req, ENOMEM);
}
else
{
/* save file handle for later use */
fh->DeviceId = DeviceId;
fh->FileId = FileId;
fip->fi.fh = (tintptr) fh;
log_debug("sending fuse_reply_open(); "
"DeviceId=%d FileId=%d req=%p",
fh->DeviceId, fh->FileId, fip->req);
/* update open count */
xfs_increment_file_open_count(g_xfs, fip->inum);
fuse_reply_open(fip->req, &fip->fi);
}
}
free(fip);
}
void xfuse_devredir_cb_read_file(struct state_read *fip,
enum NTSTATUS IoStatus,
const char *buf, size_t length)
{
if (IoStatus != STATUS_SUCCESS)
{
log_error("Read NTSTATUS is %d", (int) IoStatus);
fuse_reply_err(fip->req, EIO);
}
else
{
fuse_reply_buf(fip->req, buf, length);
}
free(fip);
}
void xfuse_devredir_cb_write_file(
struct state_write *fip,
enum NTSTATUS IoStatus,
off_t offset,
size_t length)
{
XFS_INODE *xinode;
if (IoStatus != STATUS_SUCCESS)
{
log_error("Write NTSTATUS is %d", (int) IoStatus);
fuse_reply_err(fip->req, EIO);
}
else
{
off_t new_size = offset + length;
fuse_reply_write(fip->req, length);
/* update file size */
if ((xinode = xfs_get(g_xfs, fip->inum)) != NULL)
{
if (new_size > xinode->size)
{
xinode->size = new_size;
}
}
else
{
log_error("inode %ld is invalid", fip->inum);
}
}
free(fip);
}
void xfuse_devredir_cb_rmdir_or_file(struct state_remove *fip,
enum NTSTATUS IoStatus)
{
XFS_INODE *xinode = xfs_get(g_xfs, fip->inum);
switch (IoStatus)
{
case STATUS_SUCCESS:
case STATUS_NO_SUCH_FILE:
xfs_remove_entry(g_xfs, xinode->inum); /* Remove local copy */
fuse_reply_err(fip->req, 0);
break;
case STATUS_SHARING_VIOLATION:
case STATUS_ACCESS_DENIED:
fuse_reply_err(fip->req, EACCES);
break;
default:
log_info("Error code %08x - fallthrough", (int) IoStatus);
fuse_reply_err(fip->req, EBADF);
break;
}
free(fip);
}
void xfuse_devredir_cb_rename_file(struct state_rename *fip,
enum NTSTATUS IoStatus)
{
int status;
if (IoStatus != STATUS_SUCCESS)
{
status =
(IoStatus == STATUS_SHARING_VIOLATION) ? EBUSY :
(IoStatus == STATUS_ACCESS_DENIED) ? EACCES :
/* default */ EEXIST ;
}
else
{
status = xfs_move_entry(g_xfs, fip->pinum,
fip->new_pinum, fip->name);
}
fuse_reply_err(fip->req, status);
free(fip);
}
void xfuse_devredir_cb_file_close(struct state_close *fip)
{
fuse_reply_err(fip->req, 0);
xfs_decrement_file_open_count(g_xfs, fip->inum);
free(fip);
}
/******************************************************************************
** **
** callbacks for fuse **
** **
******************************************************************************/
/**
* Look up a directory entry by name and get its attributes
*****************************************************************************/
static void xfuse_cb_lookup(fuse_req_t req, fuse_ino_t parent, const char *name)
{
XFS_INODE *parent_xinode;
XFS_INODE *xinode = NULL;
log_debug("looking for parent=%ld name=%s", parent, name);
if (strlen(name) > XFS_MAXFILENAMELEN)
{
fuse_reply_err(req, ENAMETOOLONG);
}
else if ((parent_xinode = xfs_get(g_xfs, parent)) == NULL)
{
log_error("inode %ld is not valid", parent);
fuse_reply_err(req, ENOENT);
}
else
{
if (!parent_xinode->is_redirected)
{
/* File cannot be remote - we either know about it or we don't */
if ((xinode = xfs_lookup_in_dir(g_xfs, parent, name)) != NULL)
{
log_debug("found entry for parent=%ld name=%s",
parent, name);
make_fuse_entry_reply(req, xinode);
}
else
{
fuse_reply_err(req, ENOENT);
}
}
else
{
/* specified file resides on redirected share
*
* We always look these up, and relying on libfuse to do sane
* caching */
struct state_lookup *fip = g_new0(struct state_lookup, 1);
char *full_path = get_name_for_entry_in_parent(parent, name);
if (fip == NULL || full_path == NULL)
{
log_error("system out of memory");
fuse_reply_err(req, ENOMEM);
free(fip);
free(full_path);
}
else
{
const char *cptr;
fip->req = req;
fip->pinum = parent;
strcpy(fip->name, name);
/* we want path minus 'root node of the share' */
cptr = filename_on_device(full_path);
/* If the file already exists on our side, save the inum
* and generation. If it's not remote any more this means we
* can remove it when we get the response
*/
if ((xinode = xfs_lookup_in_dir(g_xfs, parent, name)) != NULL)
{
fip->existing_inum = xinode->inum;
fip->existing_generation = xinode->generation;
}
log_debug("Looking up %s in %s on %d", name, cptr,
parent_xinode->device_id);
/*
* If this call succeeds, further request processing happens in
* xfuse_devredir_cb_lookup_entry()
*/
if (devredir_lookup_entry(fip, parent_xinode->device_id, cptr))
{
log_error("failed to send devredir_lookup_entry() cmd");
fuse_reply_err(req, EREMOTEIO);
free(fip);
}
free(full_path);
}
}
}
}
/**
* Get file attributes
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*****************************************************************************/
static void xfuse_cb_getattr(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
XFS_INODE *xino;
log_debug("req=%p ino=%ld", req, ino);
/* if ino is not valid, just return */
if ((xino = xfs_get(g_xfs, ino)) == NULL)
{
log_error("inode %ld is not valid", ino);
fuse_reply_err(req, ENOENT);
}
else
{
make_fuse_attr_reply(req, xino);
}
}
/**
*
*****************************************************************************/
/*
* Adds an entry to the buffer, using fuse_add_direnty()
*
* Returns 1 for success, or zero if the entry couldn't be added
*/
static int xfuse_dirbuf_add1(fuse_req_t req, struct dirbuf1 *b,
XFS_INODE *xinode, off_t offset)
{
struct stat stbuf;
size_t len;
int result = 0;
memset(&stbuf, 0, sizeof(stbuf));
stbuf.st_ino = xinode->inum;
stbuf.st_mode = xinode->mode & ~g_umask;
/*
* Try to add the entry. From the docs for fuse_add_direntry():-
* "Buffer needs to be large enough to hold the entry. If it's not,
* then the entry is not filled in but the size of the entry is
* still returned."
*/
len = fuse_add_direntry(req,
&b->buf[b->len], /* index where new entry will be added to buf */
sizeof(b->buf) - b->len, /* Space left */
xinode->name, /* name of entry */
&stbuf, /* file attributes */
offset /* offset of next entry */
);
if (len + b->len <= sizeof(b->buf))
{
/* Entry fitted in OK */
b->len += len;
result = 1;
}
return result;
}
/**
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*****************************************************************************/
static void xfuse_cb_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi)
{
XFS_INODE *xinode;
struct xfs_dir_handle *dh;
struct dirbuf1 b;
log_debug("req=%p inode=%ld size=%zd offset=%lld", req, ino, size, (long long) off);
/* On the first call, check the inode is valid */
if (off == 0 && !xfs_get(g_xfs, ino))
{
log_error("inode %ld is not valid", ino);
fuse_reply_err(req, ENOENT);
}
else if ((dh = (struct xfs_dir_handle *) fi->fh) == NULL)
{
/* something seriously wrong somewhere! */
fuse_reply_buf(req, 0, 0);
}
else
{
b.len = 0;
off_t new_off = off;
while ((xinode = xfs_readdir(g_xfs, dh, &new_off)) != NULL)
{
if (xfuse_dirbuf_add1(req, &b, xinode, new_off) == 0)
{
break; /* buffer is full */
}
/* Make sure we get the next entry next time */
off = new_off;
}
fuse_reply_buf(req, b.buf, b.len);
}
}
/**
* Create a directory
*****************************************************************************/
static void xfuse_cb_mkdir(fuse_req_t req, fuse_ino_t parent,
const char *name, mode_t mode)
{
XFS_INODE *xinode;
log_debug("entered: parent_inode=%ld name=%s", parent, name);
if ((xinode = xfs_lookup_in_dir(g_xfs, parent, name)) != NULL)
{
/* dir already exists, just return it */
make_fuse_entry_reply(req, xinode);
}
else
{
/* dir does not exist, create it */
xfuse_create_dir_or_file(req, parent, name, mode | S_IFDIR, NULL);
}
}
/**
* Remove a dir or file
*
*****************************************************************************/
static void xfuse_cb_unlink(fuse_req_t req, fuse_ino_t parent,
const char *name)
{
XFS_INODE *xinode;
log_debug("entered: parent=%ld name=%s", parent, name);
if (strlen(name) > XFS_MAXFILENAMELEN)
{
fuse_reply_err(req, ENAMETOOLONG);
}
else if ((xinode = xfs_lookup_in_dir(g_xfs, parent, name)) == NULL)
{
log_error("did not find file with pinode=%ld name=%s", parent, name);
fuse_reply_err(req, ENOENT);
}
else if ((xinode->mode & S_IFDIR) != 0 &&
!xfs_is_dir_empty(g_xfs, xinode->inum))
{
log_debug("cannot rmdir; directory is not empty");
fuse_reply_err(req, ENOTEMPTY);
}
else if (!xinode->is_redirected)
{
/* specified file is a local resource */
//XFUSE_HANDLE *fh;
log_debug("LK_TODO: this is still a TODO");
fuse_reply_err(req, EROFS);
}
else
{
/* specified file resides on redirected share */
struct state_remove *fip = g_new0(struct state_remove, 1);
char *full_path = xfs_get_full_path(g_xfs, xinode->inum);
if (!full_path || !fip)
{
log_error("system out of memory");
fuse_reply_err(req, ENOMEM);
free(fip);
}
else
{
const char *cptr;
fip->req = req;
fip->inum = xinode->inum;
/* we want path minus 'root node of the share' */
cptr = filename_on_device(full_path);
/* get devredir to open the remote file
*
* If this call succeeds, further request processing happens in
* xfuse_devredir_cb_rmdir_or_file()
*/
if (devredir_rmdir_or_file(fip, xinode->device_id, cptr))
{
log_error("failed to send devredir_rmdir_or_file() cmd");
fuse_reply_err(req, EREMOTEIO);
free(fip);
}
}
free(full_path);
}
}
static void xfuse_cb_rename(fuse_req_t req,
fuse_ino_t old_parent, const char *old_name,
fuse_ino_t new_parent, const char *new_name)
{
XFS_INODE *old_xinode;
XFS_INODE *new_parent_xinode;
log_debug("entered: old_parent=%ld old_name=%s new_parent=%ld new_name=%s",
old_parent, old_name, new_parent, new_name);
if (strlen(old_name) > XFS_MAXFILENAMELEN ||
strlen(new_name) > XFS_MAXFILENAMELEN)
{
fuse_reply_err(req, ENAMETOOLONG);
}
else if (!(old_xinode = xfs_lookup_in_dir(g_xfs, old_parent, old_name)))
{
log_error("did not find file with pinode=%ld name=%s",
old_parent, old_name);
fuse_reply_err(req, ENOENT);
}
else if (!(new_parent_xinode = xfs_get(g_xfs, new_parent)))
{
log_error("inode %ld is not valid", new_parent);
fuse_reply_err(req, ENOENT);
}
else if (!xfs_check_move_entry(g_xfs, old_xinode->inum,
new_parent, new_name))
{
/* Catchall -see rename(2). Fix when logging is improved */
fuse_reply_err(req, EINVAL);
}
else if (new_parent_xinode->is_redirected != old_xinode->is_redirected ||
new_parent_xinode->device_id != old_xinode->device_id)
{
fuse_reply_err(req, EXDEV);
}
else if (!old_xinode->is_redirected)
{
/* specified file is a local resource */
log_debug("LK_TODO: this is still a TODO");
fuse_reply_err(req, EROFS);
}
else
{
/* resource is on a redirected share */
struct state_rename *fip = g_new0(struct state_rename, 1);
char *old_full_path = xfs_get_full_path(g_xfs, old_xinode->inum);
char *new_full_path = get_name_for_entry_in_parent(new_parent,
new_name);
if (!old_full_path || !new_full_path || !fip)
{
log_error("system out of memory");
fuse_reply_err(req, ENOMEM);
free(fip);
free(old_full_path);
free(new_full_path);
}
else
{
const char *cptr;
const char *cp;
fip->req = req;
fip->pinum = old_xinode->inum;
fip->new_pinum = new_parent;
strcpy(fip->name, new_name);
/* we want path minus 'root node of the share' */
cptr = filename_on_device(old_full_path);
cp = filename_on_device(new_full_path);
/*
* If this call succeeds, further request processing happens in
* xfuse_devredir_cb_rename_file()
*/
if (devredir_file_rename(fip, old_xinode->device_id, cptr, cp))
{
log_error("failed to send devredir_file_rename() cmd");
fuse_reply_err(req, EREMOTEIO);
free(fip);
}
free(old_full_path);
free(new_full_path);
}
}
}
/**
* Create a directory or file
*
* @param req opaque FUSE object
* @param parent parent inode
* @param name name of dir or file to create
* @param mode creation mode
* @param fi File info from fuse_lowlevel_ops.create, or NULL.
* This may need to be copied if we're not replying immediately
*****************************************************************************/
static void xfuse_create_dir_or_file(fuse_req_t req, fuse_ino_t parent,
const char *name, mode_t mode,
struct fuse_file_info *fi)
{
XFS_INODE *xinode;
log_debug("entered: parent_ino=%ld name=%s mode=%o type=%s",
parent, name, mode, (mode & S_IFDIR) ? "dir" : "file");
/* name must be valid */
if (strlen(name) > XFS_MAXFILENAMELEN)
{
fuse_reply_err(req, ENAMETOOLONG);
}
else
{
/* Sanitise the mode
*
* Currently group/world write is not allowed.
*/
if (mode & S_IFDIR)
{
mode = (mode & 0777) | S_IFDIR;
}
else
{
mode = (mode & 0777) | S_IFREG;
}
/* is parent inode valid? */
if (parent == FUSE_ROOT_ID)
{
fuse_reply_err(req, EROFS);
}
else if ((xinode = xfs_get(g_xfs, parent)) == NULL)
{
fuse_reply_err(req, ENOENT);
}
else if ((xinode->mode & S_IFDIR) == 0)
{
fuse_reply_err(req, ENOTDIR);
}
else if (!xinode->is_redirected)
{
/* specified file is a local resource */
//XFUSE_HANDLE *fh;
log_debug("LK_TODO: this is still a TODO");
fuse_reply_err(req, EROFS);
}
else
{
struct state_create *fip = g_new0(struct state_create, 1);
char *full_path = get_name_for_entry_in_parent(parent, name);
if (full_path == NULL || fip == NULL)
{
log_error("Out of memory");
fuse_reply_err(req, ENOMEM);
free(fip);
free(full_path);
}
else
{
const char *cptr;
fip->req = req;
if (fi != NULL)
{
fip->fi = *fi;
}
fip->pinum = parent;
strcpy(fip->name, name);
fip->mode = mode;
/* we want path minus 'root node of the share' */
cptr = filename_on_device(full_path);
/*
* If this call succeeds, further request processing happens
* in xfuse_devredir_cb_create_file()
*/
if (devredir_file_create(fip, xinode->device_id, cptr, mode))
{
log_error("failed to send devredir_file_create() cmd");
fuse_reply_err(req, EREMOTEIO);
free(fip);
}
free(full_path);
}
}
}
}
/**
* Open specified file
*
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*****************************************************************************/
static void xfuse_cb_open(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
XFS_INODE *xinode;
log_debug("entered: ino=%ld", ino);
if (!(xinode = xfs_get(g_xfs, ino)))
{
log_error("inode %ld is not valid", ino);
fuse_reply_err(req, ENOENT);
}
else if (xinode->mode & S_IFDIR)
{
/* Can't open directories like this */
log_debug("reading/writing a dir not allowed!");
fuse_reply_err(req, EISDIR);
}
else if ((fi->flags & O_ACCMODE) != O_RDONLY &&
(fi->flags & O_ACCMODE) != O_WRONLY &&
(fi->flags & O_ACCMODE) != O_RDWR)
{
log_debug("Invalid access mode specified");
fuse_reply_err(req, EINVAL);
}
else if (!xinode->is_redirected)
{
/* specified file is a local resource */
if ((fi->flags & O_ACCMODE) != O_RDONLY)
{
fuse_reply_err(req, EROFS);
}
else
{
XFUSE_HANDLE *fh = g_new0(XFUSE_HANDLE, 1);
fh->is_loc_resource = 1;
fi->fh = (tintptr) fh;
fuse_reply_open(req, fi);
}
}
else
{
/* specified file resides on redirected share */
struct state_open *fip = g_new0(struct state_open, 1);
char *full_path = xfs_get_full_path(g_xfs, ino);
if (!full_path || !fip)
{
log_error("system out of memory");
fuse_reply_err(req, ENOMEM);
free(fip);
free(full_path);
}
else
{
const char *cptr;
fip->req = req;
fip->fi = *fi;
fip->inum = ino;
/* we want path minus 'root node of the share' */
cptr = filename_on_device(full_path);
/* get devredir to open the remote file
*
* If the caller has set O_TRUNC when writing the file,
* fuse should call us back via fuse_cb_setattr() to set
* the size to zero - we don't need to do this ourselves.
*
* If this call succeeds, further request processing happens in
* xfuse_devredir_cb_open_file()
*/
if (devredir_file_open(fip, xinode->device_id, cptr, fi->flags))
{
log_error("failed to send devredir_file_open() cmd");
fuse_reply_err(req, EREMOTEIO);
free(fip);
}
free(full_path);
}
}
}
/*
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*/
static void xfuse_cb_release(fuse_req_t req, fuse_ino_t ino, struct
fuse_file_info *fi)
{
XFS_INODE *xinode;
XFUSE_HANDLE *handle = (XFUSE_HANDLE *) (tintptr) (fi->fh);
log_debug("entered: ino=%ld fi=%p fi->fh=0x%llx", ino, fi,
(long long) fi->fh);
if ((xinode = xfs_get(g_xfs, ino)) == NULL)
{
log_error("inode %ld is not valid", ino);
fuse_reply_err(req, ENOENT);
}
else if (!xinode->is_redirected)
{
/* specified file is a local resource */
fuse_reply_err(req, 0);
}
else
{
/* specified file resides on redirected share */
struct state_close *fip = g_new0(struct state_close, 1);
if (fip == NULL)
{
log_error("system out of memory");
fuse_reply_err(req, ENOMEM);
return;
}
fip->req = req;
fip->inum = ino;
fip->fi = *fi;
fi->fh = 0;
/*
* If this call succeeds, further request processing happens in
* xfuse_devredir_cb_file_close()
*/
if (devredir_file_close(fip, xinode->device_id, handle->FileId))
{
log_error("failed to send devredir_close_file() cmd");
fuse_reply_err(req, EREMOTEIO);
free(fip);
}
free(handle);
}
}
/**
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*****************************************************************************/
static void xfuse_cb_read(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi)
{
XFUSE_HANDLE *fh;
struct state_read *fusep;
XFS_INODE *xinode;
struct req_list_item *rli;
log_debug("want_bytes %zd bytes at off %lld", size, (long long) off);
if ((fh = (XFUSE_HANDLE *)fi->fh) == NULL)
{
fuse_reply_err(req, EINVAL);
}
else if (fh->is_loc_resource)
{
/* target file is in .clipboard dir */
log_debug("target file is in .clipboard dir");
if ((xinode = xfs_get(g_xfs, ino)) == NULL)
{
log_error("ino does not exist in xrdp_fs");
fuse_reply_buf(req, 0, 0);
return;
}
rli = g_new0(struct req_list_item, 1);
rli->stream_id = 0;
rli->req = req;
rli->lindex = xinode->lindex;
rli->off = off;
rli->size = size;
list_add_item(g_req_list, (tbus) rli);
if (g_req_list->count == 1)
{
log_debug("requesting clipboard file data lindex = %d off = %lld size = %zd",
rli->lindex, (long long) off, size);
clipboard_request_file_data(rli->stream_id, rli->lindex,
(int) off, (int) size);
}
}
else
{
/* target file is on a remote device */
fusep = g_new0(struct state_read, 1);
if (fusep == NULL)
{
log_error("system out of memory");
fuse_reply_err(req, ENOMEM);
}
else
{
fusep->req = req;
/*
* If this call succeeds, further request processing happens in
* xfuse_devredir_cb_read_file()
*/
devredir_file_read(fusep, fh->DeviceId, fh->FileId, size, off);
}
}
}
/**
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*****************************************************************************/
static void xfuse_cb_write(fuse_req_t req, fuse_ino_t ino, const char *buf,
size_t size, off_t off, struct fuse_file_info *fi)
{
XFUSE_HANDLE *fh;
struct state_write *fusep;
log_debug("write %zd bytes at off %lld to inode=%ld",
size, (long long) off, ino);
if ((fh = (XFUSE_HANDLE *)fi->fh) == NULL)
{
log_error("file handle fi->fh is NULL");
fuse_reply_err(req, EINVAL);
}
else if (fh->is_loc_resource)
{
/* target file is in .clipboard dir */
log_debug("THIS IS STILL A TODO!");
fuse_reply_err(req, EROFS);
}
else
{
/* target file is on a remote device */
fusep = g_new0(struct state_write, 1);
if (fusep == NULL)
{
log_error("system out of memory");
fuse_reply_err(req, ENOMEM);
}
else
{
fusep->req = req;
fusep->inum = ino;
/*
* If this call succeeds, further request processing happens in
* xfuse_devredir_cb_write_file()
*/
devredir_file_write(fusep, fh->DeviceId, fh->FileId, buf,
size, off);
}
}
}
/**
*****************************************************************************/
/*
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*/
static void xfuse_cb_create(fuse_req_t req, fuse_ino_t parent,
const char *name, mode_t mode,
struct fuse_file_info *fi)
{
log_debug("entered: parent_inode=%ld, name=%s fi=%p",
parent, name, fi);
xfuse_create_dir_or_file(req, parent, name, mode & ~S_IFDIR , fi);
}
/**
*****************************************************************************/
#if 0
static void xfuse_cb_fsync(fuse_req_t req, fuse_ino_t ino, int datasync,
struct fuse_file_info *fi)
{
log_debug("#################### entered: ino=%ld datasync=%d", ino, datasync);
log_debug("function not required");
fuse_reply_err(req, EINVAL);
}
#endif
/**
* Sets attributes for a directory entry.
*
* If the file resides on a remote share, devredir
* is asked to update it. This will result in the following
* callbacks:-
* - xfuse_devredir_cb_setattr() to update our copy and return status
*
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*****************************************************************************/
static void xfuse_cb_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
int to_set, struct fuse_file_info *fi)
{
XFS_INODE *xinode;
log_debug("entered to_set=0x%x", to_set);
if ((xinode = xfs_get(g_xfs, ino)) == NULL)
{
log_error("inode %ld is not valid", ino);
fuse_reply_err(req, ENOENT);
}
else if (((to_set & FUSE_SET_ATTR_UID) && attr->st_uid != xinode->uid) ||
((to_set & FUSE_SET_ATTR_GID) && attr->st_gid != xinode->gid))
{
/* We don't allow any of these */
fuse_reply_err(req, EPERM);
}
else if ((to_set & FUSE_SET_ATTR_MODE) &&
(attr->st_mode & ~(0777 | S_IFDIR | S_IFREG)) != 0)
{
/* We only support standard mode bits and S_IFDIR / S_IFREG */
log_error("Asking for invalid mode bits 0%o to be set", attr->st_mode);
fuse_reply_err(req, EINVAL);
}
else
{
struct file_attr attrs = {0};
tui32 change_mask = 0;
if ((to_set & FUSE_SET_ATTR_MODE) && xinode->mode != attr->st_mode)
{
attrs.mode = attr->st_mode & (0777 | S_IFDIR | S_IFREG);
change_mask |= TO_SET_MODE;
}
if ((to_set & FUSE_SET_ATTR_SIZE) && xinode->size != attr->st_size)
{
attrs.size = attr->st_size;
change_mask |= TO_SET_SIZE;
}
if ((to_set & FUSE_SET_ATTR_ATIME) && xinode->atime != attr->st_atime)
{
attrs.atime = attr->st_atime;
change_mask |= TO_SET_ATIME;
}
if ((to_set & FUSE_SET_ATTR_MTIME) && xinode->mtime != attr->st_mtime)
{
attrs.mtime = attr->st_mtime;
change_mask |= TO_SET_MTIME;
}
if (change_mask == 0)
{
/* No changes have been made */
make_fuse_attr_reply(req, xinode);
}
else if (!xinode->is_redirected)
{
/* Update the local fs */
update_inode_file_attributes(&attrs, change_mask, xinode);
make_fuse_attr_reply(req, xinode);
}
else
{
struct state_setattr *fip = g_new0(struct state_setattr, 1);
char *full_path = xfs_get_full_path(g_xfs, ino);
if (!full_path || !fip)
{
log_error("system out of memory");
fuse_reply_err(req, ENOMEM);
free(fip);
free(full_path);
}
else
{
const char *cptr;
fip->req = req;
fip->inum = ino;
/* Save the important stuff so we can update our node if the
* remote update is successful */
fip->fattr = attrs;
fip->change_mask = change_mask;
/* we want path minus 'root node of the share' */
cptr = filename_on_device(full_path);
/*
* If this call succeeds, further request processing happens
* in xfuse_devredir_cb_setattr()
*/
if (devredir_setattr_for_entry(fip, xinode->device_id,
cptr, &attrs, change_mask) < 0)
{
fuse_reply_err(req, EIO);
free(fip);
}
free(full_path);
}
}
}
}
/**
* Get dir listing
*
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*****************************************************************************/
static void xfuse_cb_opendir(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
XFS_INODE *xinode;
log_debug("inode=%ld", ino);
if ((xinode = xfs_get(g_xfs, ino)) == NULL)
{
log_error("inode %ld is not valid", ino);
fuse_reply_err(req, ENOENT);
}
else if (!xinode->is_redirected)
{
if ((fi->fh = (tintptr) xfs_opendir(g_xfs, ino)) == 0)
{
fuse_reply_err(req, ENOMEM);
}
else
{
fuse_reply_open(req, fi);
}
}
else
{
log_debug("did not find entry; redirecting call to devredir");
struct state_dirscan *fip = g_new0(struct state_dirscan, 1);
char *full_path = xfs_get_full_path(g_xfs, ino);
if (full_path == NULL || fip == NULL)
{
fuse_reply_err(req, ENOMEM);
free(fip);
free(full_path);
}
else
{
const char *cptr;
log_debug("dev_id=%d ino=%ld full_path=%s",
xinode->device_id, ino, full_path);
fip->req = req;
fip->pinum = ino;
fip->fi = *fi;
/* we want path minus 'root node of the share' */
cptr = filename_on_device(full_path);
/*
* If this call succeeds, further request processing happens in:-
* - xfuse_devredir_cb_enum_dir_add_entry()
* Called for every file in the directory
* - xfuse_devredir_cb_enum_dir_done()
* Called at the end of the directory scan
*/
if (devredir_get_dir_listing(fip, xinode->device_id, cptr))
{
log_error("failed to send devredir_get_dir_listing() cmd");
fuse_reply_buf(req, NULL, 0);
free(fip);
}
free(full_path);
}
}
}
/**
* GOTCHA : For FUSE 2.9 at least, the 'fi' parameter is allocated on the
* stack by the caller, so must be copied if we're not using it
* to reply to FUSE immediately
*****************************************************************************/
static void xfuse_cb_releasedir(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
struct xfs_dir_handle *dh = (struct xfs_dir_handle *) fi->fh;
xfs_closedir(g_xfs, dh);
fuse_reply_err(req, 0);
}
/******************************************************************************
* miscellaneous functions
*****************************************************************************/
static void xfs_inode_to_fuse_entry_param(const XFS_INODE *xinode,
struct fuse_entry_param *e)
{
memset(e, 0, sizeof(*e));
e->ino = xinode->inum;
e->attr_timeout = XFUSE_ATTR_TIMEOUT;
e->entry_timeout = XFUSE_ENTRY_TIMEOUT;
e->attr.st_ino = xinode->inum;
e->attr.st_mode = xinode->mode & ~g_umask;
e->attr.st_nlink = 1;
e->attr.st_uid = xinode->uid;
e->attr.st_gid = xinode->gid;
e->attr.st_size = xinode->size;
e->attr.st_atime = xinode->atime;
e->attr.st_mtime = xinode->mtime;
e->attr.st_ctime = xinode->ctime;
e->generation = xinode->generation;
}
static void make_fuse_entry_reply(fuse_req_t req, const XFS_INODE *xinode)
{
struct fuse_entry_param e;
xfs_inode_to_fuse_entry_param(xinode, &e);
fuse_reply_entry(req, &e);
}
static void make_fuse_attr_reply(fuse_req_t req, const XFS_INODE *xinode)
{
struct stat st;
memset(&st, 0, sizeof(st));
st.st_ino = xinode->inum;
st.st_mode = xinode->mode & ~g_umask;
st.st_nlink = 1;
st.st_uid = xinode->uid;
st.st_gid = xinode->gid;
st.st_size = xinode->size;
st.st_atime = xinode->atime;
st.st_mtime = xinode->mtime;
st.st_ctime = xinode->ctime;
fuse_reply_attr(req, &st, XFUSE_ATTR_TIMEOUT);
}
/*
* Get the name of a file on the device
*
* For redirected devices, the routine xfs_get_full_path() returns names
* like "/C:/Windows/System32".
* This routine simply returns a pointer to the part of the name following
* the device specification.
*/
static const char *filename_on_device(const char *full_path)
{
const char *result = NULL;
if (full_path[0] != '\0')
{
result = strchr(full_path + 1, '/');
}
return result ? result : "/";
}
/*
* Updates attributes on the filesystem, and bumps the inode ctime
*
* This call is used to set attributes, either locally, or following a
* setattr devredir call
*/
static void update_inode_file_attributes(const struct file_attr *fattr,
tui32 change_mask, XFS_INODE *xinode)
{
int updated = 0;
if ((change_mask & TO_SET_MODE) != 0 && xinode->mode != fattr->mode)
{
xinode->mode = fattr->mode;
updated = 1;
}
if ((change_mask & TO_SET_SIZE) != 0 && xinode->size != fattr->size)
{
xinode->size = fattr->size;
updated = 1;
}
if ((change_mask & TO_SET_ATIME) != 0 && xinode->atime != fattr->atime)
{
xinode->atime = fattr->atime;
updated = 1;
}
if ((change_mask & TO_SET_MTIME) != 0 && xinode->mtime != fattr->mtime)
{
xinode->mtime = fattr->mtime;
updated = 1;
}
if (updated)
{
xinode->ctime = time(0);
}
}
/*
* Gets the name for a file where we know the parent inode and the
* name for the file under that inode
*
* Result must be freed after use
*/
static char *get_name_for_entry_in_parent(fuse_ino_t parent, const char *name)
{
char *result;
if ((result = xfs_get_full_path(g_xfs, parent)) != NULL)
{
char * p = (char *) realloc(result,
strlen(result) + 1 + strlen(name) + 1);
if (p == NULL)
{
/* See cppcheck trac #9292 and #9437 */
/* cppcheck-suppress doubleFree symbolName=result */
free(result);
result = NULL;
}
else
{
result = p;
strcat(result, "/");
strcat(result, name);
}
}
return result;
}
#endif /* end else #ifndef XRDP_FUSE */
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