guacamole-spice-protocol/src/protocols/rdp/guac_rdpdr/rdpdr_fs.c

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac-client-rdp.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
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#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
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#include <fcntl.h>
#include <fnmatch.h>
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#ifdef ENABLE_WINPR
#include <winpr/stream.h>
#else
#include "compat/winpr-stream.h"
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
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#include <guacamole/pool.h>
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#include "rdpdr_messages.h"
#include "rdpdr_fs.h"
#include "rdpdr_service.h"
#include "client.h"
#include "unicode.h"
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#include <freerdp/utils/svc_plugin.h>
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/**
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* Translates an absolute Windows virtual_path to an absolute virtual_path
* which is within the "drive virtual_path" specified in the connection
* settings.
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*/
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static void __guac_rdpdr_fs_translate_path(guac_rdpdr_device* device,
const char* virtual_path, char* real_path) {
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/* Get drive path */
rdp_guac_client_data* client_data = (rdp_guac_client_data*) device->rdpdr->client->data;
char* drive_path = client_data->settings.drive_path;
int i;
/* Start with path from settings */
for (i=0; i<GUAC_RDPDR_FS_MAX_PATH-1; i++) {
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/* Break on end-of-string */
char c = *(drive_path++);
if (c == 0)
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break;
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/* Copy character */
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*(real_path++) = c;
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}
/* Translate path */
for (; i<GUAC_RDPDR_FS_MAX_PATH-1; i++) {
/* Stop at end of string */
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char c = *(virtual_path++);
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if (c == 0)
break;
/* Translate backslashes to forward slashes */
if (c == '\\')
c = '/';
/* Store in real path buffer */
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*(real_path++)= c;
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}
/* Null terminator */
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*real_path = 0;
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}
int guac_rdpdr_fs_open(guac_rdpdr_device* device,
const char* path, int access, int create_disposition) {
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guac_rdpdr_fs_data* data = (guac_rdpdr_fs_data*) device->data;
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char real_path[GUAC_RDPDR_FS_MAX_PATH];
char normalized_path[GUAC_RDPDR_FS_MAX_PATH];
struct stat file_stat;
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int fd;
int file_id;
guac_rdpdr_fs_file* file;
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mode_t mode;
int flags = 0;
/* If no files available, return too many open */
if (data->open_files >= GUAC_RDPDR_FS_MAX_FILES)
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return GUAC_RDPDR_FS_ENFILE;
/* If path empty, transform to root path */
if (path[0] == '\0')
path = "\\";
/* If path is relative, the file does not exist */
else if (path[0] != '\\')
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return GUAC_RDPDR_FS_ENOENT;
/* Translate access into mode */
if (access & ACCESS_GENERIC_ALL)
mode = O_RDWR;
else if ((access & (ACCESS_GENERIC_WRITE | ACCESS_FILE_WRITE_DATA))
&& (access & (ACCESS_GENERIC_READ | ACCESS_FILE_READ_DATA)))
mode = O_RDWR;
else if (access & (ACCESS_GENERIC_WRITE | ACCESS_FILE_WRITE_DATA))
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mode = O_WRONLY;
else
mode = O_RDONLY;
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/* If append access requested, add appropriate option */
if (access & ACCESS_FILE_APPEND_DATA)
flags |= O_APPEND;
switch (create_disposition) {
/* Supersede (replace) if exists, otherwise create */
case DISP_FILE_SUPERSEDE:
flags |= O_TRUNC | O_CREAT;
break;
/* Open file if exists and do not overwrite, fail otherwise */
case DISP_FILE_OPEN:
flags |= O_APPEND;
break;
/* Create if not exist, fail otherwise */
case DISP_FILE_CREATE:
flags |= O_EXCL;
break;
/* Open if exists, create otherwise */
case DISP_FILE_OPEN_IF:
flags |= O_APPEND | O_CREAT;
break;
/* Overwrite if exists, fail otherwise */
case DISP_FILE_OVERWRITE:
/* No flag necessary - default functionality of open */
break;
/* Overwrite if exists, create otherwise */
case DISP_FILE_OVERWRITE_IF:
flags |= O_CREAT;
break;
/* Unrecognised disposition */
default:
return GUAC_RDPDR_FS_ENOENT; /* FIXME: Replace with real return value */
}
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/* Normalize path, return no-such-file if invalid */
if (guac_rdpdr_fs_normalize_path(path, normalized_path))
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return GUAC_RDPDR_FS_ENOENT;
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/* Translate normalized path to real path */
__guac_rdpdr_fs_translate_path(device, normalized_path, real_path);
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/* Open file */
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fd = open(real_path, flags, mode);
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if (fd == -1)
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return GUAC_RDPDR_FS_ENOENT;
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/* Get file ID, init file */
file_id = guac_pool_next_int(data->file_id_pool);
file = &(data->files[file_id]);
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file->fd = fd;
file->dir = NULL;
file->dir_pattern[0] = '\0';
file->absolute_path = strdup(normalized_path);
/* Attempt to pull file information */
if (fstat(fd, &file_stat) == 0) {
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/* Load size and times */
file->size = file_stat.st_size;
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file->ctime = WINDOWS_TIME(file_stat.st_ctime);
file->mtime = WINDOWS_TIME(file_stat.st_mtime);
file->atime = WINDOWS_TIME(file_stat.st_atime);
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/* Set type */
if (S_ISDIR(file_stat.st_mode))
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file->attributes = FILE_ATTRIBUTE_DIRECTORY;
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else
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file->attributes = FILE_ATTRIBUTE_NORMAL;
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}
/* If information cannot be retrieved, fake it */
else {
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guac_client_log_info(device->rdpdr->client,
"Unable to read information for \"%s\"",
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real_path);
/* Init information to 0, lacking any alternative */
file->size = 0;
file->ctime = 0;
file->mtime = 0;
file->atime = 0;
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file->attributes = FILE_ATTRIBUTE_NORMAL;
}
data->open_files++;
return file_id;
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}
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void guac_rdpdr_fs_close(guac_rdpdr_device* device, int file_id) {
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guac_rdpdr_fs_data* data = (guac_rdpdr_fs_data*) device->data;
guac_rdpdr_fs_file* file;
/* Only close if file ID is valid */
if (file_id < 0 || file_id >= GUAC_RDPDR_FS_MAX_FILES)
return;
file = &(data->files[file_id]);
/* Close directory, if open */
if (file->dir != NULL)
closedir(file->dir);
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/* Close file */
close(file->fd);
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/* Free name */
free(file->absolute_path);
/* Free ID back to pool */
guac_pool_free_int(data->file_id_pool, file_id);
data->open_files--;
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}
const char* guac_rdpdr_fs_read_dir(guac_rdpdr_device* device, int file_id) {
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guac_rdpdr_fs_data* data = (guac_rdpdr_fs_data*) device->data;
guac_rdpdr_fs_file* file;
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struct dirent* result;
/* Only read if file ID is valid */
if (file_id < 0 || file_id >= GUAC_RDPDR_FS_MAX_FILES)
return NULL;
file = &(data->files[file_id]);
/* Open directory if not yet open, stop if error */
if (file->dir == NULL) {
file->dir = fdopendir(file->fd);
if (file->dir == NULL)
return NULL;
}
/* Read next entry, stop if error */
if (readdir_r(file->dir, &(file->__dirent), &result))
return NULL;
/* If no more entries, return NULL */
if (result == NULL)
return NULL;
/* Return filename */
return file->__dirent.d_name;
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}
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int guac_rdpdr_fs_normalize_path(const char* path, char* abs_path) {
int i;
int path_depth = 0;
char path_component_data[GUAC_RDPDR_FS_MAX_PATH];
const char* path_components[64];
const char** current_path_component = &(path_components[0]);
const char* current_path_component_data = &(path_component_data[0]);
/* If original path is not absolute, normalization fails */
if (path[0] != '\\' && path[0] != '/')
return 1;
/* Skip past leading slash */
path++;
/* Copy path into component data for parsing */
strncpy(path_component_data, path, GUAC_RDPDR_FS_MAX_PATH-1);
/* Find path components within path */
for (i=0; i<GUAC_RDPDR_FS_MAX_PATH; i++) {
/* If current character is a path separator, parse as component */
char c = path_component_data[i];
if (c == '/' || c == '\\' || c == 0) {
/* Terminate current component */
path_component_data[i] = 0;
/* If component refers to parent, just move up in depth */
if (strcmp(current_path_component_data, "..") == 0) {
if (path_depth > 0)
path_depth--;
}
/* Otherwise, if component not current directory, add to list */
else if (strcmp(current_path_component_data, ".") != 0
&& strcmp(current_path_component_data, "") != 0)
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path_components[path_depth++] = current_path_component_data;
/* If end of string, stop */
if (c == 0)
break;
/* Update start of next component */
current_path_component_data = &(path_component_data[i+1]);
} /* end if separator */
} /* end for each character */
/* If no components, the path is simply root */
if (path_depth == 0) {
strcpy(abs_path, "\\");
return 0;
}
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/* Ensure last component is null-terminated */
path_component_data[i] = 0;
/* Convert components back into path */
for (; path_depth > 0; path_depth--) {
const char* filename = *(current_path_component++);
/* Add separator */
*(abs_path++) = '\\';
/* Copy string */
while (*filename != 0)
*(abs_path++) = *(filename++);
}
/* Terminate absolute path */
*(abs_path++) = 0;
return 0;
}
int guac_rdpdr_fs_convert_path(const char* parent, const char* rel_path, char* abs_path) {
int i;
char combined_path[GUAC_RDPDR_FS_MAX_PATH];
char* current = combined_path;
/* Copy parent path */
for (i=0; i<GUAC_RDPDR_FS_MAX_PATH; i++) {
char c = *(parent++);
if (c == 0)
break;
*(current++) = c;
}
/* Add trailing slash */
*(current++) = '\\';
/* Copy remaining path */
strncpy(current, rel_path, GUAC_RDPDR_FS_MAX_PATH-i-2);
/* Normalize into provided buffer */
return guac_rdpdr_fs_normalize_path(combined_path, abs_path);
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}
guac_rdpdr_fs_file* guac_rdpdr_fs_get_file(guac_rdpdr_device* device,
int file_id) {
/* Validate ID */
guac_rdpdr_fs_data* data = (guac_rdpdr_fs_data*) device->data;
if (file_id < 0 || file_id >= GUAC_RDPDR_FS_MAX_FILES)
return NULL;
/* Return file at given ID */
return &(data->files[file_id]);
}
int guac_rdpdr_fs_matches(const char* filename, const char* pattern) {
return fnmatch(pattern, filename, FNM_NOESCAPE) != 0;
}