792 lines
23 KiB
C
792 lines
23 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include "config.h"
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#include "rdp_fs.h"
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#include "rdp_status.h"
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#include "rdp_stream.h"
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/statvfs.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <guacamole/client.h>
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#include <guacamole/object.h>
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#include <guacamole/pool.h>
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#include <guacamole/socket.h>
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#include <guacamole/string.h>
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#include <guacamole/user.h>
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guac_rdp_fs* guac_rdp_fs_alloc(guac_client* client, const char* drive_path,
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int create_drive_path) {
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/* Create drive path if it does not exist */
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if (create_drive_path) {
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guac_client_log(client, GUAC_LOG_DEBUG,
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"%s: Creating directory \"%s\" if necessary.",
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__func__, drive_path);
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/* Log error if directory creation fails */
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if (mkdir(drive_path, S_IRWXU) && errno != EEXIST) {
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guac_client_log(client, GUAC_LOG_ERROR,
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"Unable to create directory \"%s\": %s",
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drive_path, strerror(errno));
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}
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}
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guac_rdp_fs* fs = malloc(sizeof(guac_rdp_fs));
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fs->client = client;
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fs->drive_path = strdup(drive_path);
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fs->file_id_pool = guac_pool_alloc(0);
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fs->open_files = 0;
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return fs;
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}
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void guac_rdp_fs_free(guac_rdp_fs* fs) {
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guac_pool_free(fs->file_id_pool);
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free(fs->drive_path);
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free(fs);
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}
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guac_object* guac_rdp_fs_alloc_object(guac_rdp_fs* fs, guac_user* user) {
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/* Init filesystem */
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guac_object* fs_object = guac_user_alloc_object(user);
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fs_object->get_handler = guac_rdp_download_get_handler;
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fs_object->put_handler = guac_rdp_upload_put_handler;
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fs_object->data = fs;
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/* Send filesystem to user */
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guac_protocol_send_filesystem(user->socket, fs_object, "Shared Drive");
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guac_socket_flush(user->socket);
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return fs_object;
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}
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void* guac_rdp_fs_expose(guac_user* user, void* data) {
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guac_rdp_fs* fs = (guac_rdp_fs*) data;
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/* No need to expose if there is no filesystem or the user has left */
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if (user == NULL || fs == NULL)
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return NULL;
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/* Allocate and expose filesystem object for user */
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return guac_rdp_fs_alloc_object(fs, user);
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}
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/**
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* Translates an absolute Windows path to an absolute path which is within the
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* "drive path" specified in the connection settings. No checking is performed
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* on the path provided, which is assumed to have already been normalized and
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* validated as absolute.
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*
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* @param fs
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* The filesystem containing the file whose path is being translated.
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*
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* @param virtual_path
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* The absolute path to the file on the simulated filesystem, relative to
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* the simulated filesystem root.
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*
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* @param real_path
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* The buffer in which to store the absolute path to the real file on the
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* local filesystem.
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*/
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static void __guac_rdp_fs_translate_path(guac_rdp_fs* fs,
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const char* virtual_path, char* real_path) {
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/* Get drive path */
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char* drive_path = fs->drive_path;
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int i;
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/* Start with path from settings */
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for (i=0; i<GUAC_RDP_FS_MAX_PATH-1; i++) {
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/* Break on end-of-string */
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char c = *(drive_path++);
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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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}
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/* Translate path */
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for (; i<GUAC_RDP_FS_MAX_PATH-1; i++) {
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/* Stop at end of string */
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char c = *(virtual_path++);
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if (c == 0)
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break;
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/* Translate backslashes to forward slashes */
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if (c == '\\')
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c = '/';
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/* Store in real path buffer */
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*(real_path++)= c;
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}
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/* Null terminator */
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*real_path = 0;
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}
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int guac_rdp_fs_get_errorcode(int err) {
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/* Translate errno codes to GUAC_RDP_FS codes */
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if (err == ENFILE) return GUAC_RDP_FS_ENFILE;
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if (err == ENOENT) return GUAC_RDP_FS_ENOENT;
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if (err == ENOTDIR) return GUAC_RDP_FS_ENOTDIR;
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if (err == ENOSPC) return GUAC_RDP_FS_ENOSPC;
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if (err == EISDIR) return GUAC_RDP_FS_EISDIR;
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if (err == EACCES) return GUAC_RDP_FS_EACCES;
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if (err == EEXIST) return GUAC_RDP_FS_EEXIST;
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if (err == EINVAL) return GUAC_RDP_FS_EINVAL;
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if (err == ENOSYS) return GUAC_RDP_FS_ENOSYS;
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if (err == ENOTSUP) return GUAC_RDP_FS_ENOTSUP;
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/* Default to invalid parameter */
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return GUAC_RDP_FS_EINVAL;
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}
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int guac_rdp_fs_get_status(int err) {
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/* Translate GUAC_RDP_FS error code to RDPDR status code */
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if (err == GUAC_RDP_FS_ENFILE) return STATUS_NO_MORE_FILES;
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if (err == GUAC_RDP_FS_ENOENT) return STATUS_NO_SUCH_FILE;
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if (err == GUAC_RDP_FS_ENOTDIR) return STATUS_NOT_A_DIRECTORY;
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if (err == GUAC_RDP_FS_ENOSPC) return STATUS_DISK_FULL;
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if (err == GUAC_RDP_FS_EISDIR) return STATUS_FILE_IS_A_DIRECTORY;
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if (err == GUAC_RDP_FS_EACCES) return STATUS_ACCESS_DENIED;
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if (err == GUAC_RDP_FS_EEXIST) return STATUS_OBJECT_NAME_COLLISION;
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if (err == GUAC_RDP_FS_EINVAL) return STATUS_INVALID_PARAMETER;
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if (err == GUAC_RDP_FS_ENOSYS) return STATUS_NOT_IMPLEMENTED;
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if (err == GUAC_RDP_FS_ENOTSUP) return STATUS_NOT_SUPPORTED;
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/* Default to invalid parameter */
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return STATUS_INVALID_PARAMETER;
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}
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int guac_rdp_fs_open(guac_rdp_fs* fs, const char* path,
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int access, int file_attributes, int create_disposition,
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int create_options) {
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char real_path[GUAC_RDP_FS_MAX_PATH];
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char normalized_path[GUAC_RDP_FS_MAX_PATH];
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struct stat file_stat;
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int fd;
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int file_id;
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guac_rdp_fs_file* file;
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int flags = 0;
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: path=\"%s\", access=0x%x, file_attributes=0x%x, "
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"create_disposition=0x%x, create_options=0x%x",
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__func__, path, access, file_attributes,
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create_disposition, create_options);
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/* If no files available, return too many open */
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if (fs->open_files >= GUAC_RDP_FS_MAX_FILES) {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Too many open files.",
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__func__, path);
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return GUAC_RDP_FS_ENFILE;
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}
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/* If path empty, transform to root path */
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if (path[0] == '\0')
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path = "\\";
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/* If path is relative, the file does not exist */
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else if (path[0] != '\\' && path[0] != '/') {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Access denied - supplied path \"%s\" is relative.",
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__func__, path);
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return GUAC_RDP_FS_ENOENT;
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}
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/* Translate access into flags */
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if (access & ACCESS_GENERIC_ALL)
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flags = O_RDWR;
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else if ((access & ( ACCESS_GENERIC_WRITE
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| ACCESS_FILE_WRITE_DATA
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| ACCESS_FILE_APPEND_DATA))
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&& (access & (ACCESS_GENERIC_READ | ACCESS_FILE_READ_DATA)))
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flags = O_RDWR;
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else if (access & ( ACCESS_GENERIC_WRITE
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| ACCESS_FILE_WRITE_DATA
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| ACCESS_FILE_APPEND_DATA))
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flags = O_WRONLY;
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else
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flags = O_RDONLY;
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/* Normalize path, return no-such-file if invalid */
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if (guac_rdp_fs_normalize_path(path, normalized_path)) {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Normalization of path \"%s\" failed.", __func__, path);
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return GUAC_RDP_FS_ENOENT;
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}
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Normalized path \"%s\" to \"%s\".",
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__func__, path, normalized_path);
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/* Translate normalized path to real path */
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__guac_rdp_fs_translate_path(fs, normalized_path, real_path);
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Translated path \"%s\" to \"%s\".",
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__func__, normalized_path, real_path);
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switch (create_disposition) {
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/* Create if not exist, fail otherwise */
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case DISP_FILE_CREATE:
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flags |= O_CREAT | O_EXCL;
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break;
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/* Open file if exists and do not overwrite, fail otherwise */
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case DISP_FILE_OPEN:
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/* No flag necessary - default functionality of open */
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break;
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/* Open if exists, create otherwise */
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case DISP_FILE_OPEN_IF:
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flags |= O_CREAT;
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break;
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/* Overwrite if exists, fail otherwise */
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case DISP_FILE_OVERWRITE:
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flags |= O_TRUNC;
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break;
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/* Overwrite if exists, create otherwise */
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case DISP_FILE_OVERWRITE_IF:
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flags |= O_CREAT | O_TRUNC;
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break;
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/* Supersede (replace) if exists, otherwise create */
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case DISP_FILE_SUPERSEDE:
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unlink(real_path);
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flags |= O_CREAT | O_TRUNC;
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break;
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/* Unrecognised disposition */
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default:
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return GUAC_RDP_FS_ENOSYS;
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}
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/* Create directory first, if necessary */
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if ((create_options & FILE_DIRECTORY_FILE) && (flags & O_CREAT)) {
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/* Create directory */
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if (mkdir(real_path, S_IRWXU)) {
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if (errno != EEXIST || (flags & O_EXCL)) {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: mkdir() failed: %s",
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__func__, strerror(errno));
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return guac_rdp_fs_get_errorcode(errno);
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}
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}
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/* Unset O_CREAT and O_EXCL as directory must exist before open() */
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flags &= ~(O_CREAT | O_EXCL);
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}
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: native open: real_path=\"%s\", flags=0x%x",
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__func__, real_path, flags);
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/* Open file */
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fd = open(real_path, flags, S_IRUSR | S_IWUSR);
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/* If file open failed as we're trying to write a dir, retry as read-only */
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if (fd == -1 && errno == EISDIR) {
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flags &= ~(O_WRONLY | O_RDWR);
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flags |= O_RDONLY;
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fd = open(real_path, flags, S_IRUSR | S_IWUSR);
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}
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if (fd == -1) {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: open() failed: %s", __func__, strerror(errno));
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return guac_rdp_fs_get_errorcode(errno);
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}
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/* Get file ID, init file */
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file_id = guac_pool_next_int(fs->file_id_pool);
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file = &(fs->files[file_id]);
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file->id = file_id;
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file->fd = fd;
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file->dir = NULL;
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file->dir_pattern[0] = '\0';
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file->absolute_path = strdup(normalized_path);
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file->real_path = strdup(real_path);
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file->bytes_written = 0;
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Opened \"%s\" as file_id=%i",
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__func__, normalized_path, file_id);
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/* Attempt to pull file information */
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if (fstat(fd, &file_stat) == 0) {
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/* Load size and times */
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file->size = file_stat.st_size;
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file->ctime = WINDOWS_TIME(file_stat.st_ctime);
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file->mtime = WINDOWS_TIME(file_stat.st_mtime);
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file->atime = WINDOWS_TIME(file_stat.st_atime);
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/* Set type */
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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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}
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/* If information cannot be retrieved, fake it */
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else {
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/* Init information to 0, lacking any alternative */
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file->size = 0;
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file->ctime = 0;
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file->mtime = 0;
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file->atime = 0;
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file->attributes = FILE_ATTRIBUTE_NORMAL;
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}
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fs->open_files++;
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return file_id;
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}
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int guac_rdp_fs_read(guac_rdp_fs* fs, int file_id, int offset,
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void* buffer, int length) {
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int bytes_read;
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guac_rdp_fs_file* file = guac_rdp_fs_get_file(fs, file_id);
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if (file == NULL) {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Read from bad file_id: %i", __func__, file_id);
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return GUAC_RDP_FS_EINVAL;
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}
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/* Attempt read */
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lseek(file->fd, offset, SEEK_SET);
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bytes_read = read(file->fd, buffer, length);
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/* Translate errno on error */
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if (bytes_read < 0)
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return guac_rdp_fs_get_errorcode(errno);
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return bytes_read;
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}
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int guac_rdp_fs_write(guac_rdp_fs* fs, int file_id, int offset,
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void* buffer, int length) {
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int bytes_written;
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guac_rdp_fs_file* file = guac_rdp_fs_get_file(fs, file_id);
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if (file == NULL) {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Write to bad file_id: %i", __func__, file_id);
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return GUAC_RDP_FS_EINVAL;
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}
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/* Attempt write */
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lseek(file->fd, offset, SEEK_SET);
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bytes_written = write(file->fd, buffer, length);
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/* Translate errno on error */
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if (bytes_written < 0)
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return guac_rdp_fs_get_errorcode(errno);
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file->bytes_written += bytes_written;
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return bytes_written;
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}
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int guac_rdp_fs_rename(guac_rdp_fs* fs, int file_id,
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const char* new_path) {
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char real_path[GUAC_RDP_FS_MAX_PATH];
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char normalized_path[GUAC_RDP_FS_MAX_PATH];
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guac_rdp_fs_file* file = guac_rdp_fs_get_file(fs, file_id);
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if (file == NULL) {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Rename of bad file_id: %i", __func__, file_id);
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return GUAC_RDP_FS_EINVAL;
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}
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/* Normalize path, return no-such-file if invalid */
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if (guac_rdp_fs_normalize_path(new_path, normalized_path)) {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Normalization of path \"%s\" failed.",
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__func__, new_path);
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return GUAC_RDP_FS_ENOENT;
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}
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/* Translate normalized path to real path */
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__guac_rdp_fs_translate_path(fs, normalized_path, real_path);
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: Renaming \"%s\" -> \"%s\"",
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__func__, file->real_path, real_path);
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/* Perform rename */
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if (rename(file->real_path, real_path)) {
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guac_client_log(fs->client, GUAC_LOG_DEBUG,
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"%s: rename() failed: \"%s\" -> \"%s\"",
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__func__, file->real_path, real_path);
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return guac_rdp_fs_get_errorcode(errno);
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}
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return 0;
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}
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int guac_rdp_fs_delete(guac_rdp_fs* fs, int file_id) {
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/* Get file */
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guac_rdp_fs_file* file = guac_rdp_fs_get_file(fs, file_id);
|
|
if (file == NULL) {
|
|
guac_client_log(fs->client, GUAC_LOG_DEBUG,
|
|
"%s: Delete of bad file_id: %i", __func__, file_id);
|
|
return GUAC_RDP_FS_EINVAL;
|
|
}
|
|
|
|
/* If directory, attempt removal */
|
|
if (file->attributes & FILE_ATTRIBUTE_DIRECTORY) {
|
|
if (rmdir(file->real_path)) {
|
|
guac_client_log(fs->client, GUAC_LOG_DEBUG,
|
|
"%s: rmdir() failed: \"%s\"", __func__, file->real_path);
|
|
return guac_rdp_fs_get_errorcode(errno);
|
|
}
|
|
}
|
|
|
|
/* Otherwise, attempt deletion */
|
|
else if (unlink(file->real_path)) {
|
|
guac_client_log(fs->client, GUAC_LOG_DEBUG,
|
|
"%s: unlink() failed: \"%s\"", __func__, file->real_path);
|
|
return guac_rdp_fs_get_errorcode(errno);
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
int guac_rdp_fs_truncate(guac_rdp_fs* fs, int file_id, int length) {
|
|
|
|
/* Get file */
|
|
guac_rdp_fs_file* file = guac_rdp_fs_get_file(fs, file_id);
|
|
if (file == NULL) {
|
|
guac_client_log(fs->client, GUAC_LOG_DEBUG,
|
|
"%s: Delete of bad file_id: %i", __func__, file_id);
|
|
return GUAC_RDP_FS_EINVAL;
|
|
}
|
|
|
|
/* Attempt truncate */
|
|
if (ftruncate(file->fd, length)) {
|
|
guac_client_log(fs->client, GUAC_LOG_DEBUG,
|
|
"%s: ftruncate() to %i bytes failed: \"%s\"",
|
|
__func__, length, file->real_path);
|
|
return guac_rdp_fs_get_errorcode(errno);
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
void guac_rdp_fs_close(guac_rdp_fs* fs, int file_id) {
|
|
|
|
guac_rdp_fs_file* file = guac_rdp_fs_get_file(fs, file_id);
|
|
if (file == NULL) {
|
|
guac_client_log(fs->client, GUAC_LOG_DEBUG,
|
|
"%s: Ignoring close for bad file_id: %i",
|
|
__func__, file_id);
|
|
return;
|
|
}
|
|
|
|
file = &(fs->files[file_id]);
|
|
|
|
guac_client_log(fs->client, GUAC_LOG_DEBUG,
|
|
"%s: Closed \"%s\" (file_id=%i)",
|
|
__func__, file->absolute_path, file_id);
|
|
|
|
/* Close directory, if open */
|
|
if (file->dir != NULL)
|
|
closedir(file->dir);
|
|
|
|
/* Close file */
|
|
close(file->fd);
|
|
|
|
/* Free name */
|
|
free(file->absolute_path);
|
|
free(file->real_path);
|
|
|
|
/* Free ID back to pool */
|
|
guac_pool_free_int(fs->file_id_pool, file_id);
|
|
fs->open_files--;
|
|
|
|
}
|
|
|
|
const char* guac_rdp_fs_read_dir(guac_rdp_fs* fs, int file_id) {
|
|
|
|
guac_rdp_fs_file* file;
|
|
|
|
struct dirent* result;
|
|
|
|
/* Only read if file ID is valid */
|
|
if (file_id < 0 || file_id >= GUAC_RDP_FS_MAX_FILES)
|
|
return NULL;
|
|
|
|
file = &(fs->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 or no more entries */
|
|
if ((result = readdir(file->dir)) == NULL)
|
|
return NULL;
|
|
|
|
/* Return filename */
|
|
return result->d_name;
|
|
|
|
}
|
|
|
|
int guac_rdp_fs_normalize_path(const char* path, char* abs_path) {
|
|
|
|
int path_depth = 0;
|
|
const char* path_components[GUAC_RDP_MAX_PATH_DEPTH];
|
|
|
|
/* If original path is not absolute, normalization fails */
|
|
if (path[0] != '\\' && path[0] != '/')
|
|
return 1;
|
|
|
|
/* Create scratch copy of path excluding leading slash (we will be
|
|
* replacing path separators with null terminators and referencing those
|
|
* substrings directly as path components) */
|
|
char path_scratch[GUAC_RDP_FS_MAX_PATH - 1];
|
|
int length = guac_strlcpy(path_scratch, path + 1,
|
|
sizeof(path_scratch));
|
|
|
|
/* Fail if provided path is too long */
|
|
if (length >= sizeof(path_scratch))
|
|
return 1;
|
|
|
|
/* Locate all path components within path */
|
|
const char* current_path_component = &(path_scratch[0]);
|
|
for (int i = 0; i <= length; i++) {
|
|
|
|
/* If current character is a path separator, parse as component */
|
|
char c = path_scratch[i];
|
|
if (c == '/' || c == '\\' || c == '\0') {
|
|
|
|
/* Terminate current component */
|
|
path_scratch[i] = '\0';
|
|
|
|
/* If component refers to parent, just move up in depth */
|
|
if (strcmp(current_path_component, "..") == 0) {
|
|
if (path_depth > 0)
|
|
path_depth--;
|
|
}
|
|
|
|
/* Otherwise, if component not current directory, add to list */
|
|
else if (strcmp(current_path_component, ".") != 0
|
|
&& strcmp(current_path_component, "") != 0) {
|
|
|
|
/* Fail normalization if path is too deep */
|
|
if (path_depth >= GUAC_RDP_MAX_PATH_DEPTH)
|
|
return 1;
|
|
|
|
path_components[path_depth++] = current_path_component;
|
|
|
|
}
|
|
|
|
/* Update start of next component */
|
|
current_path_component = &(path_scratch[i+1]);
|
|
|
|
} /* end if separator */
|
|
|
|
/* We do not currently support named streams */
|
|
else if (c == ':')
|
|
return 1;
|
|
|
|
} /* end for each character */
|
|
|
|
/* Add leading slash for resulting absolute path */
|
|
abs_path[0] = '\\';
|
|
|
|
/* Append normalized components to path, separated by slashes */
|
|
guac_strljoin(abs_path + 1, path_components, path_depth,
|
|
"\\", GUAC_RDP_FS_MAX_PATH - 1);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
int guac_rdp_fs_convert_path(const char* parent, const char* rel_path, char* abs_path) {
|
|
|
|
int length;
|
|
char combined_path[GUAC_RDP_FS_MAX_PATH];
|
|
|
|
/* Copy parent path */
|
|
length = guac_strlcpy(combined_path, parent, sizeof(combined_path));
|
|
|
|
/* Add trailing slash */
|
|
length += guac_strlcpy(combined_path + length, "\\",
|
|
sizeof(combined_path) - length);
|
|
|
|
/* Copy remaining path */
|
|
length += guac_strlcpy(combined_path + length, rel_path,
|
|
sizeof(combined_path) - length);
|
|
|
|
/* Normalize into provided buffer */
|
|
return guac_rdp_fs_normalize_path(combined_path, abs_path);
|
|
|
|
}
|
|
|
|
guac_rdp_fs_file* guac_rdp_fs_get_file(guac_rdp_fs* fs, int file_id) {
|
|
|
|
/* Validate ID */
|
|
if (file_id < 0 || file_id >= GUAC_RDP_FS_MAX_FILES)
|
|
return NULL;
|
|
|
|
/* Return file at given ID */
|
|
return &(fs->files[file_id]);
|
|
|
|
}
|
|
|
|
int guac_rdp_fs_matches(const char* filename, const char* pattern) {
|
|
return fnmatch(pattern, filename, FNM_NOESCAPE) != 0;
|
|
}
|
|
|
|
int guac_rdp_fs_get_info(guac_rdp_fs* fs, guac_rdp_fs_info* info) {
|
|
|
|
/* Read FS information */
|
|
struct statvfs fs_stat;
|
|
if (statvfs(fs->drive_path, &fs_stat))
|
|
return guac_rdp_fs_get_errorcode(errno);
|
|
|
|
/* Assign to structure */
|
|
info->blocks_available = fs_stat.f_bfree;
|
|
info->blocks_total = fs_stat.f_blocks;
|
|
info->block_size = fs_stat.f_bsize;
|
|
return 0;
|
|
|
|
}
|
|
|
|
int guac_rdp_fs_append_filename(char* fullpath, const char* path,
|
|
const char* filename) {
|
|
|
|
int i;
|
|
|
|
/* Disallow "." as a filename */
|
|
if (strcmp(filename, ".") == 0)
|
|
return 0;
|
|
|
|
/* Disallow ".." as a filename */
|
|
if (strcmp(filename, "..") == 0)
|
|
return 0;
|
|
|
|
/* Copy path, append trailing slash */
|
|
for (i=0; i<GUAC_RDP_FS_MAX_PATH; i++) {
|
|
|
|
/*
|
|
* Append trailing slash only if:
|
|
* 1) Trailing slash is not already present
|
|
* 2) Path is non-empty
|
|
*/
|
|
|
|
char c = path[i];
|
|
if (c == '\0') {
|
|
if (i > 0 && path[i-1] != '/' && path[i-1] != '\\')
|
|
fullpath[i++] = '/';
|
|
break;
|
|
}
|
|
|
|
/* Copy character if not end of string */
|
|
fullpath[i] = c;
|
|
|
|
}
|
|
|
|
/* Append filename */
|
|
for (; i<GUAC_RDP_FS_MAX_PATH; i++) {
|
|
|
|
char c = *(filename++);
|
|
if (c == '\0')
|
|
break;
|
|
|
|
/* Filenames may not contain slashes */
|
|
if (c == '\\' || c == '/')
|
|
return 0;
|
|
|
|
/* Append each character within filename */
|
|
fullpath[i] = c;
|
|
|
|
}
|
|
|
|
/* Verify path length is within maximum */
|
|
if (i == GUAC_RDP_FS_MAX_PATH)
|
|
return 0;
|
|
|
|
/* Terminate path string */
|
|
fullpath[i] = '\0';
|
|
|
|
/* Append was successful */
|
|
return 1;
|
|
|
|
}
|
|
|