406 lines
13 KiB
C
406 lines
13 KiB
C
/*
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* Copyright (C) 2013 Glyptodon LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config.h"
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#include "auth.h"
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#include "client.h"
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#include "clipboard.h"
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#include "cursor.h"
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#include "display.h"
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#include "guac_clipboard.h"
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#include "guac_cursor.h"
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#include "guac_display.h"
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#include "log.h"
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#include "settings.h"
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#include "vnc.h"
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#ifdef ENABLE_PULSE
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#include "pulse.h"
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#endif
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#ifdef ENABLE_COMMON_SSH
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#include "guac_sftp.h"
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#include "guac_ssh.h"
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#include "sftp.h"
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#endif
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#include <guacamole/client.h>
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#include <guacamole/protocol.h>
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#include <guacamole/socket.h>
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#include <guacamole/timestamp.h>
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#include <rfb/rfbclient.h>
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#include <rfb/rfbproto.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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char* GUAC_VNC_CLIENT_KEY = "GUAC_VNC";
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rfbClient* guac_vnc_get_client(guac_client* client) {
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rfbClient* rfb_client = rfbGetClient(8, 3, 4); /* 32-bpp client */
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guac_vnc_client* vnc_client = (guac_vnc_client*) client->data;
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guac_vnc_settings* vnc_settings = vnc_client->settings;
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/* Store Guac client in rfb client */
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rfbClientSetClientData(rfb_client, GUAC_VNC_CLIENT_KEY, client);
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/* Framebuffer update handler */
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rfb_client->GotFrameBufferUpdate = guac_vnc_update;
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rfb_client->GotCopyRect = guac_vnc_copyrect;
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/* Do not handle clipboard and local cursor if read-only */
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if (vnc_settings->read_only == 0) {
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/* Clipboard */
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rfb_client->GotXCutText = guac_vnc_cut_text;
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/* Set remote cursor */
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if (vnc_settings->remote_cursor) {
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rfb_client->appData.useRemoteCursor = FALSE;
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}
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else {
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/* Enable client-side cursor */
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rfb_client->appData.useRemoteCursor = TRUE;
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rfb_client->GotCursorShape = guac_vnc_cursor;
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}
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}
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/* Password */
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rfb_client->GetPassword = guac_vnc_get_password;
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/* Depth */
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guac_vnc_set_pixel_format(rfb_client, vnc_settings->color_depth);
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/* Hook into allocation so we can handle resize. */
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vnc_client->rfb_MallocFrameBuffer = rfb_client->MallocFrameBuffer;
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rfb_client->MallocFrameBuffer = guac_vnc_malloc_framebuffer;
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rfb_client->canHandleNewFBSize = 1;
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/* Set hostname and port */
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rfb_client->serverHost = strdup(vnc_settings->hostname);
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rfb_client->serverPort = vnc_settings->port;
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#ifdef ENABLE_VNC_REPEATER
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/* Set repeater parameters if specified */
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if (vnc_settings->dest_host) {
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rfb_client->destHost = strdup(vnc_settings->dest_host);
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rfb_client->destPort = vnc_settings->dest_port;
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}
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#endif
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#ifdef ENABLE_VNC_LISTEN
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/* If reverse connection enabled, start listening */
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if (vnc_settings->reverse_connect) {
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guac_client_log(client, GUAC_LOG_INFO, "Listening for connections on port %i", vnc_settings->port);
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/* Listen for connection from server */
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rfb_client->listenPort = vnc_settings->port;
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if (listenForIncomingConnectionsNoFork(rfb_client, vnc_settings->listen_timeout*1000) <= 0)
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return NULL;
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}
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#endif
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/* Set encodings if provided */
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if (vnc_settings->encodings)
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rfb_client->appData.encodingsString = strdup(vnc_settings->encodings);
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/* Connect */
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if (rfbInitClient(rfb_client, NULL, NULL))
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return rfb_client;
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/* If connection fails, return NULL */
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return NULL;
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}
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/**
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* Waits until data is available to be read from the given rfbClient, and thus
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* a call to HandleRFBServerMessages() should not block. If the timeout elapses
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* before data is available, zero is returned.
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*
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* @param rfb_client
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* The rfbClient to wait for.
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*
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* @param timeout
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* The maximum amount of time to wait, in microseconds.
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*
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* @returns
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* A positive value if data is available, zero if the timeout elapses
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* before data becomes available, or a negative value on error.
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*/
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static int guac_vnc_wait_for_messages(rfbClient* rfb_client, int timeout) {
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/* Do not explicitly wait while data is on the buffer */
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if (rfb_client->buffered)
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return 1;
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/* If no data on buffer, wait for data on socket */
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return WaitForMessage(rfb_client, timeout);
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}
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void* guac_vnc_client_thread(void* data) {
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guac_client* client = (guac_client*) data;
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guac_vnc_client* vnc_client = (guac_vnc_client*) client->data;
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guac_vnc_settings* settings = vnc_client->settings;
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/* Configure clipboard encoding */
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if (guac_vnc_set_clipboard_encoding(client, settings->clipboard_encoding)) {
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guac_client_log(client, GUAC_LOG_INFO, "Using non-standard VNC "
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"clipboard encoding: '%s'.", settings->clipboard_encoding);
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}
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/* Ensure connection is kept alive during lengthy connects */
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guac_socket_require_keep_alive(client->socket);
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/* Set up libvncclient logging */
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rfbClientLog = guac_vnc_client_log_info;
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rfbClientErr = guac_vnc_client_log_error;
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/* Attempt connection */
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rfbClient* rfb_client = guac_vnc_get_client(client);
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int retries_remaining = settings->retries;
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/* If unsuccessful, retry as many times as specified */
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while (!rfb_client && retries_remaining > 0) {
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guac_client_log(client, GUAC_LOG_INFO,
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"Connect failed. Waiting %ims before retrying...",
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GUAC_VNC_CONNECT_INTERVAL);
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/* Wait for given interval then retry */
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guac_timestamp_msleep(GUAC_VNC_CONNECT_INTERVAL);
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rfb_client = guac_vnc_get_client(client);
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retries_remaining--;
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}
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/* If the final connect attempt fails, return error */
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if (!rfb_client) {
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guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR, "Unable to connect to VNC server.");
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return NULL;
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}
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#ifdef ENABLE_PULSE
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/* If an encoding is available, load an audio stream */
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if (settings->audio_enabled) {
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vnc_client->audio = guac_audio_stream_alloc(client, NULL,
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GUAC_VNC_AUDIO_RATE,
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GUAC_VNC_AUDIO_CHANNELS,
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GUAC_VNC_AUDIO_BPS);
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/* If successful, init audio system */
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if (vnc_client->audio != NULL) {
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guac_client_log(client, GUAC_LOG_INFO,
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"Audio will be encoded as %s",
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vnc_client->audio->encoder->mimetype);
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/* Start audio stream */
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guac_pa_start_stream(client);
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}
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/* Otherwise, audio loading failed */
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else
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guac_client_log(client, GUAC_LOG_INFO,
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"No available audio encoding. Sound disabled.");
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} /* end if audio enabled */
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#endif
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#ifdef ENABLE_COMMON_SSH
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guac_common_ssh_init(client);
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/* Connect via SSH if SFTP is enabled */
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if (settings->enable_sftp) {
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guac_client_log(client, GUAC_LOG_DEBUG,
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"Connecting via SSH for SFTP filesystem access.");
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vnc_client->sftp_user =
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guac_common_ssh_create_user(settings->sftp_username);
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/* Import private key, if given */
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if (settings->sftp_private_key != NULL) {
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guac_client_log(client, GUAC_LOG_DEBUG,
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"Authenticating with private key.");
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/* Abort if private key cannot be read */
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if (guac_common_ssh_user_import_key(vnc_client->sftp_user,
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settings->sftp_private_key,
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settings->sftp_passphrase)) {
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guac_common_ssh_destroy_user(vnc_client->sftp_user);
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return NULL;
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}
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}
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/* Otherwise, use specified password */
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else {
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guac_client_log(client, GUAC_LOG_DEBUG,
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"Authenticating with password.");
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guac_common_ssh_user_set_password(vnc_client->sftp_user,
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settings->sftp_password);
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}
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/* Attempt SSH connection */
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vnc_client->sftp_session =
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guac_common_ssh_create_session(client, settings->sftp_hostname,
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settings->sftp_port, vnc_client->sftp_user);
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/* Fail if SSH connection does not succeed */
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if (vnc_client->sftp_session == NULL) {
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/* Already aborted within guac_common_ssh_create_session() */
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guac_common_ssh_destroy_user(vnc_client->sftp_user);
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return NULL;
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}
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/* Load filesystem */
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vnc_client->sftp_filesystem =
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guac_common_ssh_create_sftp_filesystem(
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vnc_client->sftp_session, "/");
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/* Expose filesystem to connection owner */
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guac_client_for_owner(client,
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guac_common_ssh_expose_sftp_filesystem,
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vnc_client->sftp_filesystem);
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/* Abort if SFTP connection fails */
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if (vnc_client->sftp_filesystem == NULL) {
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guac_common_ssh_destroy_session(vnc_client->sftp_session);
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guac_common_ssh_destroy_user(vnc_client->sftp_user);
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return NULL;
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}
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/* Configure destination for basic uploads, if specified */
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if (settings->sftp_directory != NULL)
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guac_common_ssh_sftp_set_upload_path(
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vnc_client->sftp_filesystem,
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settings->sftp_directory);
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guac_client_log(client, GUAC_LOG_DEBUG,
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"SFTP connection succeeded.");
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}
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#endif
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/* Set remaining client data */
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vnc_client->rfb_client = rfb_client;
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/* Send name */
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guac_protocol_send_name(client->socket, rfb_client->desktopName);
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/* Create display */
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vnc_client->display = guac_common_display_alloc(client,
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rfb_client->width, rfb_client->height);
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/* If not read-only, set an appropriate cursor */
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if (settings->read_only == 0) {
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if (settings->remote_cursor)
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guac_common_cursor_set_dot(vnc_client->display->cursor);
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else
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guac_common_cursor_set_pointer(vnc_client->display->cursor);
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}
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guac_socket_flush(client->socket);
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guac_timestamp last_frame_end = guac_timestamp_current();
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/* Handle messages from VNC server while client is running */
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while (client->state == GUAC_CLIENT_RUNNING) {
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/* Wait for start of frame */
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int wait_result = guac_vnc_wait_for_messages(rfb_client,
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GUAC_VNC_FRAME_START_TIMEOUT);
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if (wait_result > 0) {
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guac_timestamp frame_start = guac_timestamp_current();
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/* Calculate time since last frame */
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int time_elapsed = frame_start - last_frame_end;
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int processing_lag = guac_client_get_processing_lag(client);
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/* Force roughly-equal length of server and client frames */
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if (time_elapsed < processing_lag)
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guac_timestamp_msleep(processing_lag - time_elapsed);
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/* Read server messages until frame is built */
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do {
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guac_timestamp frame_end;
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int frame_remaining;
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/* Handle any message received */
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if (!HandleRFBServerMessage(rfb_client)) {
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guac_client_abort(client,
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GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR,
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"Error handling message from VNC server.");
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break;
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}
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/* Calculate time remaining in frame */
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frame_end = guac_timestamp_current();
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frame_remaining = frame_start + GUAC_VNC_FRAME_DURATION
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- frame_end;
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/* Wait again if frame remaining */
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if (frame_remaining > 0)
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wait_result = guac_vnc_wait_for_messages(rfb_client,
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GUAC_VNC_FRAME_TIMEOUT*1000);
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else
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break;
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} while (wait_result > 0);
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/* Record end of frame */
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last_frame_end = guac_timestamp_current();
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}
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/* If an error occurs, log it and fail */
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if (wait_result < 0)
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guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR, "Connection closed.");
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guac_common_surface_flush(vnc_client->display->default_surface);
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guac_client_end_frame(client);
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guac_socket_flush(client->socket);
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}
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guac_client_log(client, GUAC_LOG_INFO, "Internal VNC client disconnected");
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return NULL;
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}
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