658 lines
20 KiB
C
658 lines
20 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 "client.h"
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#include "common/defaults.h"
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#include "settings.h"
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#include <guacamole/user.h>
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#include <guacamole/wol-constants.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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/* Client plugin arguments */
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const char* GUAC_VNC_CLIENT_ARGS[] = {
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"hostname",
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"port",
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"read-only",
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"encodings",
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"username",
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"password",
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"swap-red-blue",
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"color-depth",
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"cursor",
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"autoretry",
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"clipboard-encoding",
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#ifdef ENABLE_VNC_REPEATER
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"dest-host",
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"dest-port",
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#endif
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#ifdef ENABLE_PULSE
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"enable-audio",
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"audio-servername",
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#endif
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#ifdef ENABLE_VNC_LISTEN
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"reverse-connect",
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"listen-timeout",
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#endif
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#ifdef ENABLE_COMMON_SSH
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"enable-sftp",
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"sftp-hostname",
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"sftp-host-key",
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"sftp-port",
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"sftp-username",
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"sftp-password",
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"sftp-private-key",
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"sftp-passphrase",
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"sftp-directory",
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"sftp-root-directory",
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"sftp-server-alive-interval",
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"sftp-disable-download",
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"sftp-disable-upload",
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#endif
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"recording-path",
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"recording-name",
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"recording-exclude-output",
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"recording-exclude-mouse",
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"recording-include-keys",
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"create-recording-path",
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"disable-copy",
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"disable-paste",
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"wol-send-packet",
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"wol-mac-addr",
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"wol-broadcast-addr",
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"wol-wait-time",
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NULL
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};
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enum VNC_ARGS_IDX {
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/**
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* The hostname of the VNC server (or repeater) to connect to.
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*/
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IDX_HOSTNAME,
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/**
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* The port of the VNC server (or repeater) to connect to.
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*/
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IDX_PORT,
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/**
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* "true" if this connection should be read-only (user input should be
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* dropped), "false" or blank otherwise.
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*/
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IDX_READ_ONLY,
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/**
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* Space-separated list of encodings to use within the VNC session. If not
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* specified, this will be:
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*
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* "zrle ultra copyrect hextile zlib corre rre raw".
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*/
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IDX_ENCODINGS,
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/**
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* The username to send to the VNC server if authentication is requested.
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*/
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IDX_USERNAME,
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/**
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* The password to send to the VNC server if authentication is requested.
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*/
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IDX_PASSWORD,
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/**
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* "true" if the red and blue components of each color should be swapped,
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* "false" or blank otherwise. This is mainly used for VNC servers that do
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* not properly handle colors.
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*/
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IDX_SWAP_RED_BLUE,
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/**
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* The color depth to request, in bits.
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*/
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IDX_COLOR_DEPTH,
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/**
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* "remote" if the cursor should be rendered on the server instead of the
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* client. All other values will default to local rendering.
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*/
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IDX_CURSOR,
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/**
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* The number of connection attempts to make before giving up. By default,
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* this will be 0.
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*/
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IDX_AUTORETRY,
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/**
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* The encoding to use for clipboard data sent to the VNC server if we are
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* going to be deviating from the standard (which mandates ISO 8829-1).
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* Valid values are "ISO8829-1" (the only legal value with respect to the
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* VNC standard), "UTF-8", "UTF-16", and "CP2252".
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*/
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IDX_CLIPBOARD_ENCODING,
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#ifdef ENABLE_VNC_REPEATER
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/**
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* The VNC host to connect to, if using a repeater.
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*/
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IDX_DEST_HOST,
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/**
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* The VNC port to connect to, if using a repeater.
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*/
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IDX_DEST_PORT,
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#endif
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#ifdef ENABLE_PULSE
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/**
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* "true" if audio should be enabled, "false" or blank otherwise.
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*/
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IDX_ENABLE_AUDIO,
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/**
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* The name of the PulseAudio server to connect to. If left blank, the
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* default sink of the local machine will be used as the source for audio.
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*/
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IDX_AUDIO_SERVERNAME,
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#endif
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#ifdef ENABLE_VNC_LISTEN
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/**
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* "true" if not actually connecting to a VNC server, but rather listening
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* for a connection from the VNC server (reverse connection), "false" or
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* blank otherwise.
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*/
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IDX_REVERSE_CONNECT,
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/**
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* The maximum amount of time to wait when listening for connections, in
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* milliseconds. If unspecified, this will default to 5000.
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*/
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IDX_LISTEN_TIMEOUT,
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#endif
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#ifdef ENABLE_COMMON_SSH
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/**
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* "true" if SFTP should be enabled for the VNC connection, "false" or
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* blank otherwise.
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*/
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IDX_ENABLE_SFTP,
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/**
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* The hostname of the SSH server to connect to for SFTP. If blank, the
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* hostname of the VNC server will be used.
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*/
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IDX_SFTP_HOSTNAME,
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/**
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* The public SSH host key to identify the SFTP server.
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*/
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IDX_SFTP_HOST_KEY,
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/**
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* The port of the SSH server to connect to for SFTP. If blank, the default
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* SSH port of "22" will be used.
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*/
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IDX_SFTP_PORT,
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/**
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* The username to provide when authenticating with the SSH server for
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* SFTP.
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*/
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IDX_SFTP_USERNAME,
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/**
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* The password to provide when authenticating with the SSH server for
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* SFTP (if not using a private key).
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*/
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IDX_SFTP_PASSWORD,
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/**
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* The base64-encoded private key to use when authenticating with the SSH
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* server for SFTP (if not using a password).
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*/
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IDX_SFTP_PRIVATE_KEY,
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/**
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* The passphrase to use to decrypt the provided base64-encoded private
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* key.
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*/
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IDX_SFTP_PASSPHRASE,
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/**
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* The default location for file uploads within the SSH server. This will
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* apply only to uploads which do not use the filesystem guac_object (where
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* the destination directory is otherwise ambiguous).
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*/
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IDX_SFTP_DIRECTORY,
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/**
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* The path of the directory within the SSH server to expose as a
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* filesystem guac_object. If omitted, "/" will be used by default.
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*/
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IDX_SFTP_ROOT_DIRECTORY,
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/**
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* The interval at which SSH keepalive messages are sent to the server for
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* SFTP connections. The default is 0 (disabling keepalives), and a value
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* of 1 is automatically incremented to 2 by libssh2 to avoid busy loop corner
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* cases.
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*/
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IDX_SFTP_SERVER_ALIVE_INTERVAL,
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/**
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* If set to "true", file downloads over SFTP will be blocked. If set to
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* "false" or not set, file downloads will be allowed.
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*/
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IDX_SFTP_DISABLE_DOWNLOAD,
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/**
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* If set to "true", file uploads over SFTP will be blocked. If set to
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* "false" or not set, file uploads will be allowed.
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*/
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IDX_SFTP_DISABLE_UPLOAD,
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#endif
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/**
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* The full absolute path to the directory in which screen recordings
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* should be written.
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*/
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IDX_RECORDING_PATH,
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/**
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* The name that should be given to screen recordings which are written in
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* the given path.
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*/
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IDX_RECORDING_NAME,
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/**
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* Whether output which is broadcast to each connected client (graphics,
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* streams, etc.) should NOT be included in the session recording. Output
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* is included by default, as it is necessary for any recording which must
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* later be viewable as video.
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*/
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IDX_RECORDING_EXCLUDE_OUTPUT,
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/**
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* Whether changes to mouse state, such as position and buttons pressed or
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* released, should NOT be included in the session recording. Mouse state
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* is included by default, as it is necessary for the mouse cursor to be
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* rendered in any resulting video.
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*/
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IDX_RECORDING_EXCLUDE_MOUSE,
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/**
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* Whether keys pressed and released should be included in the session
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* recording. Key events are NOT included by default within the recording,
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* as doing so has privacy and security implications. Including key events
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* may be necessary in certain auditing contexts, but should only be done
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* with caution. Key events can easily contain sensitive information, such
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* as passwords, credit card numbers, etc.
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*/
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IDX_RECORDING_INCLUDE_KEYS,
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/**
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* Whether the specified screen recording path should automatically be
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* created if it does not yet exist.
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*/
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IDX_CREATE_RECORDING_PATH,
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/**
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* Whether outbound clipboard access should be blocked. If set to "true",
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* it will not be possible to copy data from the remote desktop to the
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* client using the clipboard. By default, clipboard access is not blocked.
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*/
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IDX_DISABLE_COPY,
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/**
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* Whether inbound clipboard access should be blocked. If set to "true", it
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* will not be possible to paste data from the client to the remote desktop
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* using the clipboard. By default, clipboard access is not blocked.
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*/
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IDX_DISABLE_PASTE,
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/**
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* Whether to send the magic Wake-on-LAN (WoL) packet to wake the remote
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* host prior to attempting to connect. If set to "true" the packet will
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* be sent. By default the packet will not be sent.
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*/
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IDX_WOL_SEND_PACKET,
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/**
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* The MAC address to place in the magic WoL packet to wake the remote host.
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* If WoL is requested but this is not provided a warning will be logged
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* and the WoL packet will not be sent.
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*/
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IDX_WOL_MAC_ADDR,
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/**
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* The broadcast packet to which to send the magic WoL packet.
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*/
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IDX_WOL_BROADCAST_ADDR,
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/**
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* The number of seconds to wait after sending the magic WoL packet before
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* attempting to connect to the remote host. The default is not to wait
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* at all (0 seconds).
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*/
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IDX_WOL_WAIT_TIME,
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VNC_ARGS_COUNT
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};
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guac_vnc_settings* guac_vnc_parse_args(guac_user* user,
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int argc, const char** argv) {
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/* Validate arg count */
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if (argc != VNC_ARGS_COUNT) {
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guac_user_log(user, GUAC_LOG_WARNING, "Incorrect number of connection "
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"parameters provided: expected %i, got %i.",
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VNC_ARGS_COUNT, argc);
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return NULL;
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}
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guac_vnc_settings* settings = calloc(1, sizeof(guac_vnc_settings));
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settings->hostname =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_HOSTNAME, "");
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settings->port =
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guac_user_parse_args_int(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_PORT, 0);
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settings->username =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_USERNAME, ""); /* NOTE: freed by libvncclient */
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settings->password =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_PASSWORD, ""); /* NOTE: freed by libvncclient */
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/* Remote cursor */
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if (strcmp(argv[IDX_CURSOR], "remote") == 0) {
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guac_user_log(user, GUAC_LOG_INFO, "Cursor rendering: remote");
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settings->remote_cursor = true;
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}
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/* Local cursor */
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else {
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guac_user_log(user, GUAC_LOG_INFO, "Cursor rendering: local");
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settings->remote_cursor = false;
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}
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/* Swap red/blue (for buggy VNC servers) */
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settings->swap_red_blue =
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guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SWAP_RED_BLUE, false);
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/* Read-only mode */
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settings->read_only =
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guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_READ_ONLY, false);
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/* Parse color depth */
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settings->color_depth =
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guac_user_parse_args_int(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_COLOR_DEPTH, 0);
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#ifdef ENABLE_VNC_REPEATER
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/* Set repeater parameters if specified */
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settings->dest_host =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_DEST_HOST, NULL);
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/* VNC repeater port */
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settings->dest_port =
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guac_user_parse_args_int(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_DEST_PORT, 0);
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#endif
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/* Set encodings if specified */
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settings->encodings =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_ENCODINGS,
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"zrle ultra copyrect hextile zlib corre rre raw");
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/* Parse autoretry */
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settings->retries =
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guac_user_parse_args_int(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_AUTORETRY, 0);
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#ifdef ENABLE_VNC_LISTEN
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/* Set reverse-connection flag */
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settings->reverse_connect =
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guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_REVERSE_CONNECT, false);
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/* Parse listen timeout */
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settings->listen_timeout =
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guac_user_parse_args_int(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_LISTEN_TIMEOUT, 5000);
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#endif
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#ifdef ENABLE_PULSE
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/* Audio enable/disable */
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settings->audio_enabled =
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guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_ENABLE_AUDIO, false);
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/* Load servername if specified and applicable */
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if (settings->audio_enabled)
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settings->pa_servername =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_AUDIO_SERVERNAME, NULL);
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#endif
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/* Set clipboard encoding if specified */
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settings->clipboard_encoding =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_CLIPBOARD_ENCODING, NULL);
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#ifdef ENABLE_COMMON_SSH
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/* SFTP enable/disable */
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settings->enable_sftp =
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guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_ENABLE_SFTP, false);
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/* Hostname for SFTP connection */
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settings->sftp_hostname =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SFTP_HOSTNAME, settings->hostname);
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/* The public SSH host key. */
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settings->sftp_host_key =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SFTP_HOST_KEY, NULL);
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/* Port for SFTP connection */
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settings->sftp_port =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SFTP_PORT, "22");
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/* Username for SSH/SFTP authentication */
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settings->sftp_username =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SFTP_USERNAME, "");
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/* Password for SFTP (if not using private key) */
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settings->sftp_password =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SFTP_PASSWORD, "");
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/* Private key for SFTP (if not using password) */
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settings->sftp_private_key =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SFTP_PRIVATE_KEY, NULL);
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/* Passphrase for decrypting the SFTP private key (if applicable */
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settings->sftp_passphrase =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SFTP_PASSPHRASE, "");
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/* Default upload directory */
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settings->sftp_directory =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SFTP_DIRECTORY, NULL);
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/* SFTP root directory */
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settings->sftp_root_directory =
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guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
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IDX_SFTP_ROOT_DIRECTORY, "/");
|
|
|
|
/* Default keepalive value */
|
|
settings->sftp_server_alive_interval =
|
|
guac_user_parse_args_int(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_SFTP_SERVER_ALIVE_INTERVAL, 0);
|
|
|
|
settings->sftp_disable_download =
|
|
guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_SFTP_DISABLE_DOWNLOAD, false);
|
|
|
|
settings->sftp_disable_upload =
|
|
guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_SFTP_DISABLE_UPLOAD, false);
|
|
#endif
|
|
|
|
/* Read recording path */
|
|
settings->recording_path =
|
|
guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_RECORDING_PATH, NULL);
|
|
|
|
/* Read recording name */
|
|
settings->recording_name =
|
|
guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_RECORDING_NAME, GUAC_VNC_DEFAULT_RECORDING_NAME);
|
|
|
|
/* Parse output exclusion flag */
|
|
settings->recording_exclude_output =
|
|
guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_RECORDING_EXCLUDE_OUTPUT, false);
|
|
|
|
/* Parse mouse exclusion flag */
|
|
settings->recording_exclude_mouse =
|
|
guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_RECORDING_EXCLUDE_MOUSE, false);
|
|
|
|
/* Parse key event inclusion flag */
|
|
settings->recording_include_keys =
|
|
guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_RECORDING_INCLUDE_KEYS, false);
|
|
|
|
/* Parse path creation flag */
|
|
settings->create_recording_path =
|
|
guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_CREATE_RECORDING_PATH, false);
|
|
|
|
/* Parse clipboard copy disable flag */
|
|
settings->disable_copy =
|
|
guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_DISABLE_COPY, false);
|
|
|
|
/* Parse clipboard paste disable flag */
|
|
settings->disable_paste =
|
|
guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_DISABLE_PASTE, false);
|
|
|
|
/* Parse Wake-on-LAN (WoL) settings */
|
|
settings->wol_send_packet =
|
|
guac_user_parse_args_boolean(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_WOL_SEND_PACKET, false);
|
|
|
|
if (settings->wol_send_packet) {
|
|
|
|
/* If WoL has been enabled but no MAC provided, log warning and disable. */
|
|
if(strcmp(argv[IDX_WOL_MAC_ADDR], "") == 0) {
|
|
guac_user_log(user, GUAC_LOG_WARNING, "Wake on LAN was requested, ",
|
|
"but no MAC address was specified. WoL will not be sent.");
|
|
settings->wol_send_packet = false;
|
|
}
|
|
|
|
/* Parse the WoL MAC address. */
|
|
settings->wol_mac_addr =
|
|
guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_WOL_MAC_ADDR, NULL);
|
|
|
|
/* Parse the WoL broadcast address. */
|
|
settings->wol_broadcast_addr =
|
|
guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_WOL_BROADCAST_ADDR, GUAC_WOL_LOCAL_IPV4_BROADCAST);
|
|
|
|
/* Parse the WoL wait time. */
|
|
settings->wol_wait_time =
|
|
guac_user_parse_args_int(user, GUAC_VNC_CLIENT_ARGS, argv,
|
|
IDX_WOL_WAIT_TIME, GUAC_WOL_DEFAULT_BOOT_WAIT_TIME);
|
|
|
|
}
|
|
|
|
return settings;
|
|
|
|
}
|
|
|
|
void guac_vnc_settings_free(guac_vnc_settings* settings) {
|
|
|
|
/* Free settings strings */
|
|
free(settings->clipboard_encoding);
|
|
free(settings->encodings);
|
|
free(settings->hostname);
|
|
free(settings->recording_name);
|
|
free(settings->recording_path);
|
|
|
|
#ifdef ENABLE_VNC_REPEATER
|
|
/* Free VNC repeater settings */
|
|
free(settings->dest_host);
|
|
#endif
|
|
|
|
#ifdef ENABLE_COMMON_SSH
|
|
/* Free SFTP settings */
|
|
free(settings->sftp_directory);
|
|
free(settings->sftp_root_directory);
|
|
free(settings->sftp_host_key);
|
|
free(settings->sftp_hostname);
|
|
free(settings->sftp_passphrase);
|
|
free(settings->sftp_password);
|
|
free(settings->sftp_port);
|
|
free(settings->sftp_private_key);
|
|
free(settings->sftp_username);
|
|
#endif
|
|
|
|
#ifdef ENABLE_PULSE
|
|
/* Free PulseAudio settings */
|
|
free(settings->pa_servername);
|
|
#endif
|
|
|
|
/* Free settings structure */
|
|
free(settings);
|
|
|
|
}
|
|
|