int guac_sftp_blob_handler(guac_client* client, guac_stream* stream,
void* data, int length) {
/* Pull file from stream */
ssh_guac_client_data* client_data = (ssh_guac_client_data*) client->data;
LIBSSH2_SFTP_HANDLE* file = (LIBSSH2_SFTP_HANDLE*) stream->data;
/* Attempt write */
if (libssh2_sftp_write(file, data, length) == length) {
guac_protocol_send_ack(client->socket, stream, "SFTP: OK",
GUAC_PROTOCOL_STATUS_SUCCESS);
guac_socket_flush(client->socket);
}
/* Inform of any errors */
else {
guac_client_log_error(client, "Unable to write to file: %s",
libssh2_sftp_last_error(client_data->sftp_session));
guac_protocol_send_ack(client->socket, stream, "SFTP: Write failed",
GUAC_PROTOCOL_STATUS_INTERNAL_ERROR);
guac_socket_flush(client->socket);
}
return 0;
}
int guac_rdp_upload_end_handler(guac_client* client, guac_stream* stream) {
guac_rdp_stream* rdp_stream = (guac_rdp_stream*) stream->data;
/* Get filesystem, return error if no filesystem */
guac_rdp_fs* fs = ((rdp_guac_client_data*) client->data)->filesystem;
if (fs == NULL) {
guac_protocol_send_ack(client->socket, stream, "FAIL (NO FS)",
GUAC_PROTOCOL_STATUS_SERVER_ERROR);
guac_socket_flush(client->socket);
return 0;
}
/* Close file */
guac_rdp_fs_close(fs, rdp_stream->upload_status.file_id);
/* Acknowledge stream end */
guac_protocol_send_ack(client->socket, stream, "OK (STREAM END)",
GUAC_PROTOCOL_STATUS_SUCCESS);
guac_socket_flush(client->socket);
free(rdp_stream);
return 0;
}
int guac_rdp_download_ack_handler(guac_client* client, guac_stream* stream,
char* message, guac_protocol_status status) {
guac_rdp_stream* rdp_stream = (guac_rdp_stream*) stream->data;
/* Get filesystem, return error if no filesystem */
guac_rdp_fs* fs = ((rdp_guac_client_data*) client->data)->filesystem;
if (fs == NULL) {
guac_protocol_send_ack(client->socket, stream, "FAIL (NO FS)",
GUAC_PROTOCOL_STATUS_SERVER_ERROR);
guac_socket_flush(client->socket);
return 0;
}
/* If successful, read data */
if (status == GUAC_PROTOCOL_STATUS_SUCCESS) {
/* Attempt read into buffer */
char buffer[4096];
int bytes_read = guac_rdp_fs_read(fs,
rdp_stream->download_status.file_id,
rdp_stream->download_status.offset, buffer, sizeof(buffer));
/* If bytes read, send as blob */
if (bytes_read > 0) {
rdp_stream->download_status.offset += bytes_read;
guac_protocol_send_blob(client->socket, stream,
buffer, bytes_read);
}
/* If EOF, send end */
else if (bytes_read == 0) {
guac_protocol_send_end(client->socket, stream);
guac_client_free_stream(client, stream);
free(rdp_stream);
}
/* Otherwise, fail stream */
else {
guac_client_log(client, GUAC_LOG_ERROR,
"Error reading file for download");
guac_protocol_send_end(client->socket, stream);
guac_client_free_stream(client, stream);
free(rdp_stream);
}
guac_socket_flush(client->socket);
}
/* Otherwise, return stream to client */
else
guac_client_free_stream(client, stream);
return 0;
}
static void __stream_read_callback(pa_stream* stream, size_t length,
void* data) {
guac_client* client = (guac_client*) data;
vnc_guac_client_data* client_data = (vnc_guac_client_data*) client->data;
guac_audio_stream* audio = client_data->audio;
const void* buffer;
/* Read data */
pa_stream_peek(stream, &buffer, &length);
/* Avoid sending silence unless data is waiting to be flushed */
if (audio->pcm_bytes_written != 0 || !guac_pa_is_silence(buffer, length)) {
/* Write data */
guac_audio_stream_write_pcm(audio, buffer, length);
/* Flush occasionally */
if (audio->pcm_bytes_written > GUAC_VNC_PCM_WRITE_RATE) {
guac_audio_stream_end(audio);
guac_audio_stream_begin(client_data->audio,
GUAC_VNC_AUDIO_RATE,
GUAC_VNC_AUDIO_CHANNELS,
GUAC_VNC_AUDIO_BPS);
guac_socket_flush(client->socket);
}
}
/* Advance buffer */
pa_stream_drop(stream);
}
int guac_rdp_user_file_handler(guac_user* user, guac_stream* stream,
char* mimetype, char* filename) {
guac_rdp_client* rdp_client = (guac_rdp_client*) user->client->data;
#ifdef ENABLE_COMMON_SSH
guac_rdp_settings* settings = rdp_client->settings;
/* If SFTP is enabled, it should be used for default uploads only if RDPDR
* is not enabled or its upload directory has been set */
if (rdp_client->sftp_filesystem != NULL) {
if (!settings->drive_enabled || settings->sftp_directory != NULL)
return guac_rdp_sftp_file_handler(user, stream, mimetype, filename);
}
#endif
/* Default to using RDPDR uploads (if enabled) */
if (rdp_client->filesystem != NULL)
return guac_rdp_upload_file_handler(user, stream, mimetype, filename);
/* File transfer not enabled */
guac_protocol_send_ack(user->socket, stream, "File transfer disabled",
GUAC_PROTOCOL_STATUS_UNSUPPORTED);
guac_socket_flush(user->socket);
return 0;
}
int guac_rdp_svc_pipe_handler(guac_client* client, guac_stream* stream,
char* mimetype, char* name) {
guac_rdp_stream* rdp_stream;
guac_rdp_svc* svc = guac_rdp_get_svc(client, name);
/* Fail if no such SVC */
if (svc == NULL) {
guac_client_log(client, GUAC_LOG_ERROR,
"Requested non-existent pipe: \"%s\".",
name);
guac_protocol_send_ack(client->socket, stream, "FAIL (NO SUCH PIPE)",
GUAC_PROTOCOL_STATUS_CLIENT_BAD_REQUEST);
guac_socket_flush(client->socket);
return 0;
}
else
guac_client_log(client, GUAC_LOG_ERROR,
"Inbound half of channel \"%s\" connected.",
name);
/* Init stream data */
stream->data = rdp_stream = malloc(sizeof(guac_rdp_stream));
stream->blob_handler = guac_rdp_svc_blob_handler;
rdp_stream->type = GUAC_RDP_INBOUND_SVC_STREAM;
rdp_stream->svc = svc;
svc->input_pipe = stream;
return 0;
}
guac_stream* guac_sftp_download_file(guac_client* client,
char* filename) {
ssh_guac_client_data* client_data = (ssh_guac_client_data*) client->data;
guac_stream* stream;
LIBSSH2_SFTP_HANDLE* file;
/* Attempt to open file for reading */
file = libssh2_sftp_open(client_data->sftp_session, filename,
LIBSSH2_FXF_READ, 0);
if (file == NULL) {
guac_client_log_error(client, "Unable to read file \"%s\": %s",
filename,
libssh2_sftp_last_error(client_data->sftp_session));
return NULL;
}
/* Allocate stream */
stream = guac_client_alloc_stream(client);
stream->ack_handler = guac_sftp_ack_handler;
stream->data = file;
/* Send stream start, strip name */
filename = basename(filename);
guac_protocol_send_file(client->socket, stream,
"application/octet-stream", filename);
guac_socket_flush(client->socket);
return stream;
}
int guac_vnc_user_join_handler(guac_user* user, int argc, char** argv) {
guac_vnc_client* vnc_client = (guac_vnc_client*) user->client->data;
/* Connect via VNC if owner */
if (user->owner) {
/* Parse arguments into client */
guac_vnc_settings* settings = vnc_client->settings =
guac_vnc_parse_args(user, argc, (const char**) argv);
/* Fail if settings cannot be parsed */
if (settings == NULL) {
guac_user_log(user, GUAC_LOG_INFO,
"Badly formatted client arguments.");
return 1;
}
/* Start client thread */
if (pthread_create(&vnc_client->client_thread, NULL, guac_vnc_client_thread, user->client)) {
guac_user_log(user, GUAC_LOG_ERROR, "Unable to start VNC client thread.");
return 1;
}
}
/* If not owner, synchronize with current state */
else {
#ifdef ENABLE_PULSE
/* Synchronize an audio stream */
if (vnc_client->audio)
guac_audio_stream_add_user(vnc_client->audio, user);
#endif
/* Synchronize with current display */
guac_common_display_dup(vnc_client->display, user, user->socket);
guac_socket_flush(user->socket);
}
/* Only handle events if not read-only */
if (vnc_client->settings->read_only == 0) {
/* General mouse/keyboard/clipboard events */
user->mouse_handler = guac_vnc_user_mouse_handler;
user->key_handler = guac_vnc_user_key_handler;
user->clipboard_handler = guac_vnc_clipboard_handler;
#ifdef ENABLE_COMMON_SSH
/* Set generic (non-filesystem) file upload handler */
user->file_handler = guac_vnc_sftp_file_handler;
#endif
}
return 0;
}
int guac_rdp_upload_blob_handler(guac_client* client, guac_stream* stream,
void* data, int length) {
int bytes_written;
guac_rdp_stream* rdp_stream = (guac_rdp_stream*) stream->data;
/* Get filesystem, return error if no filesystem 0*/
guac_rdp_fs* fs = ((rdp_guac_client_data*) client->data)->filesystem;
if (fs == NULL) {
guac_protocol_send_ack(client->socket, stream, "FAIL (NO FS)",
GUAC_PROTOCOL_STATUS_SERVER_ERROR);
guac_socket_flush(client->socket);
return 0;
}
/* Write entire block */
while (length > 0) {
/* Attempt write */
bytes_written = guac_rdp_fs_write(fs,
rdp_stream->upload_status.file_id,
rdp_stream->upload_status.offset,
data, length);
/* On error, abort */
if (bytes_written < 0) {
guac_protocol_send_ack(client->socket, stream,
"FAIL (BAD WRITE)",
GUAC_PROTOCOL_STATUS_CLIENT_FORBIDDEN);
guac_socket_flush(client->socket);
return 0;
}
/* Update counters */
rdp_stream->upload_status.offset += bytes_written;
data += bytes_written;
length -= bytes_written;
}
guac_protocol_send_ack(client->socket, stream, "OK (DATA RECEIVED)",
GUAC_PROTOCOL_STATUS_SUCCESS);
guac_socket_flush(client->socket);
return 0;
}
/**
* Called periodically by guacd whenever the plugin should handle accumulated
* data and render a frame.
*
* @param client
* The guac_client associated with the plugin that should render a frame.
*
* @return
* Non-zero if an error occurs, zero otherwise.
*/
static int streamtest_client_message_handler(guac_client* client) {
/* Get stream state from client */
streamtest_state* state = (streamtest_state*) client->data;
int frame_start;
int frame_duration;
/* Record start of frame */
frame_start = streamtest_utime();
/* Read from stream and write as blob(s) */
if (!state->paused) {
/* Attempt to fill the available buffer space */
int length = streamtest_fill_buffer(state->fd,
state->frame_buffer, state->frame_bytes);
/* Abort connection if we cannot read */
if (length == -1) {
guac_client_log(client, GUAC_LOG_ERROR,
"Unable to read from specified file: %s",
strerror(errno));
return 1;
}
/* Write all data read as blobs */
if (length > 0)
streamtest_write_blobs(client->socket, state->stream,
state->frame_buffer, length);
/* Disconnect on EOF */
else {
guac_client_log(client, GUAC_LOG_INFO, "Media streaming complete");
guac_client_stop(client);
}
}
/* Update progress bar */
streamtest_render_progress(client);
guac_socket_flush(client->socket);
/* Sleep for remainder of frame */
frame_duration = streamtest_utime() - frame_start;
if (frame_duration < state->frame_duration)
streamtest_usleep(state->frame_duration - frame_duration);
/* Warn (at debug level) if frame takes too long */
else
guac_client_log(client, GUAC_LOG_DEBUG,
"Frame took longer than requested duration: %i microseconds",
frame_duration);
/* Success */
return 0;
}
void* __guacd_client_output_thread(void* data) {
guac_client* client = (guac_client*) data;
guac_socket* socket = client->socket;
/* Guacamole client output loop */
while (client->state == GUAC_CLIENT_RUNNING) {
/* Handle server messages */
if (client->handle_messages) {
/* Only handle messages if synced within threshold */
if (client->last_sent_timestamp - client->last_received_timestamp
< GUACD_SYNC_THRESHOLD) {
int retval = client->handle_messages(client);
if (retval) {
guacd_client_log_guac_error(client,
"Error handling server messages");
guac_client_stop(client);
return NULL;
}
/* Send sync instruction */
client->last_sent_timestamp = guac_timestamp_current();
if (guac_protocol_send_sync(socket, client->last_sent_timestamp)) {
guacd_client_log_guac_error(client,
"Error sending \"sync\" instruction");
guac_client_stop(client);
return NULL;
}
/* Flush */
if (guac_socket_flush(socket)) {
guacd_client_log_guac_error(client,
"Error flushing output");
guac_client_stop(client);
return NULL;
}
}
/* Do not spin while waiting for old sync */
else
__guacdd_sleep(GUACD_MESSAGE_HANDLE_FREQUENCY);
}
/* If no message handler, just sleep until next sync ping */
else
__guacdd_sleep(GUACD_SYNC_FREQUENCY);
} /* End of output loop */
guac_client_stop(client);
return NULL;
}
/**
* Callback which is invoked by guac_client_foreach_user() to flush all
* pending data on the given user's socket. If an error occurs while flushing
* a user's socket, that user is signalled to stop with guac_user_stop().
*
* @param user
* The user whose socket should be flushed.
*
* @param data
* Arbitrary data passed to guac_client_foreach_user(). This is not needed
* by this callback, and should be left as NULL.
*
* @return
* Always NULL.
*/
static void* __flush_callback(guac_user* user, void* data) {
/* Attempt flush, disconnect on failure */
if (guac_socket_flush(user->socket))
guac_user_stop(user);
return NULL;
}
int guac_rdp_upload_file_handler(guac_client* client, guac_stream* stream,
char* mimetype, char* filename) {
int file_id;
guac_rdp_stream* rdp_stream;
char file_path[GUAC_RDP_FS_MAX_PATH];
/* Get filesystem, return error if no filesystem */
guac_rdp_fs* fs = ((rdp_guac_client_data*) client->data)->filesystem;
if (fs == NULL) {
guac_protocol_send_ack(client->socket, stream, "FAIL (NO FS)",
GUAC_PROTOCOL_STATUS_SERVER_ERROR);
guac_socket_flush(client->socket);
return 0;
}
/* Translate name */
__generate_upload_path(filename, file_path);
/* Open file */
file_id = guac_rdp_fs_open(fs, file_path, ACCESS_GENERIC_WRITE, 0,
DISP_FILE_OVERWRITE_IF, 0);
if (file_id < 0) {
guac_protocol_send_ack(client->socket, stream, "FAIL (CANNOT OPEN)",
GUAC_PROTOCOL_STATUS_CLIENT_FORBIDDEN);
guac_socket_flush(client->socket);
return 0;
}
/* Init upload status */
rdp_stream = malloc(sizeof(guac_rdp_stream));
rdp_stream->type = GUAC_RDP_UPLOAD_STREAM;
rdp_stream->upload_status.offset = 0;
rdp_stream->upload_status.file_id = file_id;
stream->data = rdp_stream;
stream->blob_handler = guac_rdp_upload_blob_handler;
stream->end_handler = guac_rdp_upload_end_handler;
guac_protocol_send_ack(client->socket, stream, "OK (STREAM BEGIN)",
GUAC_PROTOCOL_STATUS_SUCCESS);
guac_socket_flush(client->socket);
return 0;
}
int guac_sftp_end_handler(guac_client* client, guac_stream* stream) {
/* Pull file from stream */
LIBSSH2_SFTP_HANDLE* file = (LIBSSH2_SFTP_HANDLE*) stream->data;
/* Attempt to close file */
if (libssh2_sftp_close(file) == 0) {
guac_protocol_send_ack(client->socket, stream, "SFTP: OK", GUAC_PROTOCOL_STATUS_SUCCESS);
guac_socket_flush(client->socket);
}
else {
guac_client_log_error(client, "Unable to close file");
guac_protocol_send_ack(client->socket, stream, "SFTP: Close failed", GUAC_PROTOCOL_STATUS_SERVER_ERROR);
guac_socket_flush(client->socket);
}
return 0;
}
int guac_rdp_user_join_handler(guac_user* user, int argc, char** argv) {
guac_rdp_client* rdp_client = (guac_rdp_client*) user->client->data;
/* Connect via RDP if owner */
if (user->owner) {
/* Parse arguments into client */
guac_rdp_settings* settings = rdp_client->settings =
guac_rdp_parse_args(user, argc, (const char**) argv);
/* Fail if settings cannot be parsed */
if (settings == NULL) {
guac_user_log(user, GUAC_LOG_INFO,
"Badly formatted client arguments.");
return 1;
}
/* Start client thread */
if (pthread_create(&rdp_client->client_thread, NULL,
guac_rdp_client_thread, user->client)) {
guac_user_log(user, GUAC_LOG_ERROR,
"Unable to start VNC client thread.");
return 1;
}
}
/* If not owner, synchronize with current state */
else {
/* Synchronize any audio stream */
if (rdp_client->audio)
guac_audio_stream_add_user(rdp_client->audio, user);
/* Bring user up to date with any registered static channels */
guac_rdp_svc_send_pipes(user);
/* Synchronize with current display */
guac_common_display_dup(rdp_client->display, user, user->socket);
guac_socket_flush(user->socket);
}
user->file_handler = guac_rdp_user_file_handler;
user->mouse_handler = guac_rdp_user_mouse_handler;
user->key_handler = guac_rdp_user_key_handler;
user->size_handler = guac_rdp_user_size_handler;
user->pipe_handler = guac_rdp_svc_pipe_handler;
user->clipboard_handler = guac_rdp_clipboard_handler;
return 0;
}
int guac_rdp_upload_put_handler(guac_client* client, guac_object* object,
guac_stream* stream, char* mimetype, char* name) {
/* Get filesystem, return error if no filesystem */
guac_rdp_fs* fs = ((rdp_guac_client_data*) client->data)->filesystem;
if (fs == NULL) {
guac_protocol_send_ack(client->socket, stream, "FAIL (NO FS)",
GUAC_PROTOCOL_STATUS_SERVER_ERROR);
guac_socket_flush(client->socket);
return 0;
}
/* Open file */
int file_id = guac_rdp_fs_open(fs, name, ACCESS_GENERIC_WRITE, 0,
DISP_FILE_OVERWRITE_IF, 0);
/* Abort on failure */
if (file_id < 0) {
guac_protocol_send_ack(client->socket, stream, "FAIL (CANNOT OPEN)",
GUAC_PROTOCOL_STATUS_CLIENT_FORBIDDEN);
guac_socket_flush(client->socket);
return 0;
}
/* Init upload stream data */
guac_rdp_stream* rdp_stream = malloc(sizeof(guac_rdp_stream));
rdp_stream->type = GUAC_RDP_UPLOAD_STREAM;
rdp_stream->upload_status.offset = 0;
rdp_stream->upload_status.file_id = file_id;
/* Allocate stream, init for file upload */
stream->data = rdp_stream;
stream->blob_handler = guac_rdp_upload_blob_handler;
stream->end_handler = guac_rdp_upload_end_handler;
/* Acknowledge stream creation */
guac_protocol_send_ack(client->socket, stream, "OK (STREAM BEGIN)",
GUAC_PROTOCOL_STATUS_SUCCESS);
guac_socket_flush(client->socket);
return 0;
}
void guac_terminal_select_end(guac_terminal* terminal) {
guac_client* client = terminal->client;
guac_socket* socket = client->socket;
/* If no text is selected, nothing to do */
if (!terminal->text_selected)
return;
/* Selection is now committed */
terminal->selection_committed = true;
/* Reset current clipboard contents */
guac_common_clipboard_reset(terminal->clipboard, "text/plain");
int start_row, start_col;
int end_row, end_col;
/* Ensure proper ordering of start and end coords */
guac_terminal_select_normalized_range(terminal,
&start_row, &start_col, &end_row, &end_col);
/* If only one row, simply copy */
if (end_row == start_row)
guac_terminal_clipboard_append_row(terminal, start_row, start_col, end_col);
/* Otherwise, copy multiple rows */
else {
/* Store first row */
guac_terminal_clipboard_append_row(terminal, start_row, start_col, -1);
/* Store all middle rows */
for (int row = start_row + 1; row < end_row; row++) {
guac_common_clipboard_append(terminal->clipboard, "\n", 1);
guac_terminal_clipboard_append_row(terminal, row, 0, -1);
}
/* Store last row */
guac_common_clipboard_append(terminal->clipboard, "\n", 1);
guac_terminal_clipboard_append_row(terminal, end_row, 0, end_col);
}
/* Send data */
if (!terminal->disable_copy) {
guac_common_clipboard_send(terminal->clipboard, client);
guac_socket_flush(socket);
}
guac_terminal_notify(terminal);
}
int guac_rdp_svc_blob_handler(guac_client* client, guac_stream* stream,
void* data, int length) {
guac_rdp_stream* rdp_stream = (guac_rdp_stream*) stream->data;
/* Write blob data to SVC directly */
guac_rdp_svc_write(rdp_stream->svc, data, length);
guac_protocol_send_ack(client->socket, stream, "OK (DATA RECEIVED)",
GUAC_PROTOCOL_STATUS_SUCCESS);
guac_socket_flush(client->socket);
return 0;
}
void guac_rdpdr_start_download(guac_rdpdr_device* device, const char* path) {
/* Get client and stream */
guac_client* client = device->rdpdr->client;
int file_id = guac_rdp_fs_open((guac_rdp_fs*) device->data, path,
ACCESS_FILE_READ_DATA, 0, DISP_FILE_OPEN, 0);
/* If file opened successfully, start stream */
if (file_id >= 0) {
guac_rdp_stream* rdp_stream;
const char* basename;
int i;
char c;
/* Associate stream with transfer status */
guac_stream* stream = guac_client_alloc_stream(client);
stream->data = rdp_stream = malloc(sizeof(guac_rdp_stream));
stream->ack_handler = guac_rdp_download_ack_handler;
rdp_stream->type = GUAC_RDP_DOWNLOAD_STREAM;
rdp_stream->download_status.file_id = file_id;
rdp_stream->download_status.offset = 0;
/* Get basename from absolute path */
i=0;
basename = path;
do {
c = path[i];
if (c == '/' || c == '\\')
basename = &(path[i+1]);
i++;
} while (c != '\0');
GUAC_RDP_DEBUG(2, "Initiating download of \"%s\"", path);
/* Begin stream */
guac_protocol_send_file(client->socket, stream,
"application/octet-stream", basename);
guac_socket_flush(client->socket);
}
else
guac_client_log(client, GUAC_LOG_ERROR, "Unable to download \"%s\"", path);
}
int guac_ssh_user_join_handler(guac_user* user, int argc, char** argv) {
guac_client* client = user->client;
guac_ssh_client* ssh_client = (guac_ssh_client*) client->data;
/* Connect via SSH if owner */
if (user->owner) {
/* Parse arguments into client */
guac_ssh_settings* settings = ssh_client->settings =
guac_ssh_parse_args(user, argc, (const char**) argv);
/* Fail if settings cannot be parsed */
if (settings == NULL) {
guac_user_log(user, GUAC_LOG_INFO,
"Badly formatted client arguments.");
return 1;
}
/* Start client thread */
if (pthread_create(&(ssh_client->client_thread), NULL,
ssh_client_thread, (void*) client)) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR,
"Unable to start SSH client thread");
return 1;
}
}
/* If not owner, synchronize with current display */
else {
guac_terminal_dup(ssh_client->term, user, user->socket);
guac_socket_flush(user->socket);
}
/* Set per-user event handlers */
user->key_handler = guac_ssh_user_key_handler;
user->mouse_handler = guac_ssh_user_mouse_handler;
user->size_handler = guac_ssh_user_size_handler;
user->clipboard_handler = guac_ssh_clipboard_handler;
/* Set generic (non-filesystem) file upload handler */
user->file_handler = guac_sftp_file_handler;
return 0;
}
/**
* Clears the currently-selected region, removing the highlight.
*/
static void __guac_terminal_display_clear_select(guac_terminal_display* display) {
guac_socket* socket = display->client->socket;
guac_layer* select_layer = display->select_layer;
guac_protocol_send_rect(socket, select_layer, 0, 0, 1, 1);
guac_protocol_send_cfill(socket, GUAC_COMP_SRC, select_layer,
0x00, 0x00, 0x00, 0x00);
guac_client_end_frame(display->client);
guac_socket_flush(socket);
/* Text is no longer selected */
display->text_selected =
display->selection_committed = false;
}
void vguac_client_abort(guac_client* client, guac_protocol_status status,
const char* format, va_list ap) {
/* Only relevant if client is running */
if (client->state == GUAC_CLIENT_RUNNING) {
/* Log detail of error */
vguac_client_log_error(client, format, ap);
/* Send error immediately, limit information given */
guac_protocol_send_error(client->socket, "Aborted. See logs.", status);
guac_socket_flush(client->socket);
/* Stop client */
guac_client_stop(client);
}
}
int guac_sftp_ack_handler(guac_client* client, guac_stream* stream,
char* message, guac_protocol_status status) {
ssh_guac_client_data* client_data = (ssh_guac_client_data*) client->data;
LIBSSH2_SFTP_HANDLE* file = (LIBSSH2_SFTP_HANDLE*) stream->data;
/* If successful, read data */
if (status == GUAC_PROTOCOL_STATUS_SUCCESS) {
/* Attempt read into buffer */
char buffer[4096];
int bytes_read = libssh2_sftp_read(file, buffer, sizeof(buffer));
/* If bytes read, send as blob */
if (bytes_read > 0)
guac_protocol_send_blob(client->socket, stream,
buffer, bytes_read);
/* If EOF, send end */
else if (bytes_read == 0) {
guac_protocol_send_end(client->socket, stream);
guac_client_free_stream(client, stream);
}
/* Otherwise, fail stream */
else {
guac_client_log_error(client, "Error reading file: %s",
libssh2_sftp_last_error(client_data->sftp_session));
guac_protocol_send_end(client->socket, stream);
guac_client_free_stream(client, stream);
}
guac_socket_flush(client->socket);
}
/* Otherwise, return stream to client */
else
guac_client_free_stream(client, stream);
return 0;
}
int ssh_guac_client_size_handler(guac_client* client, int width, int height) {
/* Get terminal */
ssh_guac_client_data* guac_client_data = (ssh_guac_client_data*) client->data;
guac_terminal* terminal = guac_client_data->term;
/* Calculate dimensions */
int rows = height / terminal->display->char_height;
int columns = width / terminal->display->char_width;
pthread_mutex_lock(&(terminal->lock));
/* If size has changed */
if (columns != terminal->term_width || rows != terminal->term_height) {
/* Resize terminal */
guac_terminal_resize(terminal, columns, rows);
/* Update cursor */
guac_terminal_commit_cursor(terminal);
/* Update SSH pty size if connected */
if (guac_client_data->term_channel != NULL)
libssh2_channel_request_pty_size(guac_client_data->term_channel,
terminal->term_width, terminal->term_height);
/* Reset scroll region */
terminal->scroll_end = rows - 1;
guac_terminal_display_flush(terminal->display);
guac_protocol_send_sync(terminal->client->socket,
client->last_sent_timestamp);
guac_socket_flush(terminal->client->socket);
}
pthread_mutex_unlock(&(terminal->lock));
return 0;
}
boolean rdp_freerdp_post_connect(freerdp* instance) {
rdpContext* context = instance->context;
guac_client* client = ((rdp_freerdp_context*) context)->client;
rdpChannels* channels = instance->context->channels;
/* Init channels (post-connect) */
if (freerdp_channels_post_connect(channels, instance)) {
guac_protocol_send_error(client->socket, "Error initializing RDP client channel manager");
guac_socket_flush(client->socket);
return false;
}
/* Client handlers */
client->free_handler = rdp_guac_client_free_handler;
client->handle_messages = rdp_guac_client_handle_messages;
client->mouse_handler = rdp_guac_client_mouse_handler;
client->key_handler = rdp_guac_client_key_handler;
client->clipboard_handler = rdp_guac_client_clipboard_handler;
return true;
}
void guac_svc_process_receive(rdpSvcPlugin* plugin,
wStream* input_stream) {
/* Get corresponding guac_rdp_svc */
guac_svcPlugin* svc_plugin = (guac_svcPlugin*) plugin;
guac_rdp_svc* svc = svc_plugin->svc;
/* Fail if output not created */
if (svc->output_pipe == NULL) {
guac_client_log(svc->client, GUAC_LOG_ERROR,
"Output for channel \"%s\" dropped.",
svc->name);
return;
}
/* Send blob */
guac_protocol_send_blob(svc->client->socket, svc->output_pipe,
Stream_Buffer(input_stream),
Stream_Length(input_stream));
guac_socket_flush(svc->client->socket);
}
int guac_sftp_file_handler(guac_client* client, guac_stream* stream,
char* mimetype, char* filename) {
ssh_guac_client_data* client_data = (ssh_guac_client_data*) client->data;
char fullpath[GUAC_SFTP_MAX_PATH];
LIBSSH2_SFTP_HANDLE* file;
int i;
/* Ensure filename is a valid filename and not a path */
if (!__ssh_guac_valid_filename(filename)) {
guac_protocol_send_ack(client->socket, stream, "SFTP: Illegal filename",
GUAC_PROTOCOL_STATUS_CLIENT_BAD_REQUEST);
guac_socket_flush(client->socket);
return 0;
}
/* Copy upload path, append trailing slash */
for (i=0; i<GUAC_SFTP_MAX_PATH; i++) {
char c = client_data->sftp_upload_path[i];
if (c == '\0') {
fullpath[i++] = '/';
break;
}
fullpath[i] = c;
}
/* Append filename */
for (; i<GUAC_SFTP_MAX_PATH; i++) {
char c = *(filename++);
if (c == '\0')
break;
fullpath[i] = c;
}
/* If path + filename exceeds max length, abort */
if (i == GUAC_SFTP_MAX_PATH) {
guac_protocol_send_ack(client->socket, stream, "SFTP: Name too long", GUAC_PROTOCOL_STATUS_CLIENT_OVERRUN);
guac_socket_flush(client->socket);
return 0;
}
/* Terminate path string */
fullpath[i] = '\0';
/* Open file via SFTP */
file = libssh2_sftp_open(client_data->sftp_session, fullpath,
LIBSSH2_FXF_WRITE | LIBSSH2_FXF_CREAT | LIBSSH2_FXF_TRUNC,
S_IRUSR | S_IWUSR);
/* Inform of status */
if (file != NULL) {
guac_protocol_send_ack(client->socket, stream, "SFTP: File opened", GUAC_PROTOCOL_STATUS_SUCCESS);
guac_socket_flush(client->socket);
}
else {
guac_client_log_error(client, "Unable to open file \"%s\": %s",
fullpath, libssh2_sftp_last_error(client_data->sftp_session));
guac_protocol_send_ack(client->socket, stream, "SFTP: Open failed", GUAC_PROTOCOL_STATUS_RESOURCE_NOT_FOUND);
guac_socket_flush(client->socket);
}
/* Set handlers for file stream */
stream->blob_handler = guac_sftp_blob_handler;
stream->end_handler = guac_sftp_end_handler;
/* Store file within stream */
stream->data = file;
return 0;
}
/**
* Creates a new guac_client for the connection on the given socket, adding
* it to the client map based on its ID.
*/
static void guacd_handle_connection(guacd_client_map* map, guac_socket* socket) {
guac_client* client;
guac_client_plugin* plugin;
guac_instruction* select;
guac_instruction* size;
guac_instruction* audio;
guac_instruction* video;
guac_instruction* connect;
int init_result;
/* Reset guac_error */
guac_error = GUAC_STATUS_SUCCESS;
guac_error_message = NULL;
/* Get protocol from select instruction */
select = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "select");
if (select == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"select\"");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Validate args to select */
if (select->argc != 1) {
/* Log error */
guacd_log_error("Bad number of arguments to \"select\" (%i)",
select->argc);
/* Free resources */
guac_socket_free(socket);
return;
}
guacd_log_info("Protocol \"%s\" selected", select->argv[0]);
/* Get plugin from protocol in select */
plugin = guac_client_plugin_open(select->argv[0]);
guac_instruction_free(select);
if (plugin == NULL) {
/* Log error */
guacd_log_guac_error("Error loading client plugin");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Send args response */
if (guac_protocol_send_args(socket, plugin->args)
|| guac_socket_flush(socket)) {
/* Log error */
guacd_log_guac_error("Error sending \"args\"");
if (guac_client_plugin_close(plugin))
guacd_log_guac_error("Error closing client plugin");
guac_socket_free(socket);
return;
}
/* Get optimal screen size */
size = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "size");
if (size == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"size\"");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Get supported audio formats */
audio = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "audio");
if (audio == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"audio\"");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Get supported video formats */
video = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "video");
if (video == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"video\"");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Get args from connect instruction */
connect = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "connect");
if (connect == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"connect\"");
if (guac_client_plugin_close(plugin))
guacd_log_guac_error("Error closing client plugin");
guac_socket_free(socket);
return;
}
/* Get client */
client = guac_client_alloc();
if (client == NULL) {
guacd_log_guac_error("Client could not be allocated");
guac_socket_free(socket);
return;
}
client->socket = socket;
client->log_info_handler = guacd_client_log_info;
client->log_error_handler = guacd_client_log_error;
/* Parse optimal screen dimensions from size instruction */
client->info.optimal_width = atoi(size->argv[0]);
client->info.optimal_height = atoi(size->argv[1]);
/* If DPI given, set the client resolution */
if (size->argc >= 3)
client->info.optimal_resolution = atoi(size->argv[2]);
/* Otherwise, use a safe default for rough backwards compatibility */
else
client->info.optimal_resolution = 96;
/* Store audio mimetypes */
client->info.audio_mimetypes = malloc(sizeof(char*) * (audio->argc+1));
memcpy(client->info.audio_mimetypes, audio->argv,
sizeof(char*) * audio->argc);
client->info.audio_mimetypes[audio->argc] = NULL;
/* Store video mimetypes */
client->info.video_mimetypes = malloc(sizeof(char*) * (video->argc+1));
memcpy(client->info.video_mimetypes, video->argv,
sizeof(char*) * video->argc);
client->info.video_mimetypes[video->argc] = NULL;
/* Store client */
if (guacd_client_map_add(map, client))
guacd_log_error("Unable to add client. Internal client storage has failed");
/* Send connection ID */
guacd_log_info("Connection ID is \"%s\"", client->connection_id);
guac_protocol_send_ready(socket, client->connection_id);
/* Init client */
init_result = guac_client_plugin_init_client(plugin,
client, connect->argc, connect->argv);
guac_instruction_free(connect);
/* If client could not be started, free everything and fail */
if (init_result) {
guac_client_free(client);
guacd_log_guac_error("Error instantiating client");
if (guac_client_plugin_close(plugin))
guacd_log_guac_error("Error closing client plugin");
guac_socket_free(socket);
return;
}
/* Start client threads */
guacd_log_info("Starting client");
if (guacd_client_start(client))
guacd_log_error("Client finished abnormally");
else
guacd_log_info("Client finished normally");
/* Remove client */
if (guacd_client_map_remove(map, client->connection_id) == NULL)
guacd_log_error("Unable to remove client. Internal client storage has failed");
/* Free mimetype lists */
free(client->info.audio_mimetypes);
free(client->info.video_mimetypes);
/* Free remaining instructions */
guac_instruction_free(audio);
guac_instruction_free(video);
guac_instruction_free(size);
/* Clean up */
guac_client_free(client);
if (guac_client_plugin_close(plugin))
guacd_log_error("Error closing client plugin");
/* Close socket */
guac_socket_free(socket);
}
int guac_client_init(guac_client* client, int argc, char** argv) {
guac_socket* socket = client->socket;
guac_telnet_client_data* client_data = malloc(sizeof(guac_telnet_client_data));
/* Init client data */
client->data = client_data;
client_data->telnet = NULL;
client_data->socket_fd = -1;
client_data->naws_enabled = 0;
client_data->echo_enabled = 1;
if (argc != TELNET_ARGS_COUNT) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Wrong number of arguments");
return -1;
}
/* Read parameters */
strcpy(client_data->hostname, argv[IDX_HOSTNAME]);
/* Read port */
if (argv[IDX_PORT][0] != 0)
strcpy(client_data->port, argv[IDX_PORT]);
else
strcpy(client_data->port, GUAC_TELNET_DEFAULT_PORT);
/* Read font name */
if (argv[IDX_FONT_NAME][0] != 0)
strcpy(client_data->font_name, argv[IDX_FONT_NAME]);
else
strcpy(client_data->font_name, GUAC_TELNET_DEFAULT_FONT_NAME );
/* Read font size */
if (argv[IDX_FONT_SIZE][0] != 0)
client_data->font_size = atoi(argv[IDX_FONT_SIZE]);
else
client_data->font_size = GUAC_TELNET_DEFAULT_FONT_SIZE;
/* Create terminal */
client_data->term = guac_terminal_create(client,
client_data->font_name, client_data->font_size,
client->info.optimal_resolution,
client->info.optimal_width, client->info.optimal_height);
/* Fail if terminal init failed */
if (client_data->term == NULL) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Terminal initialization failed");
return -1;
}
/* Send initial name */
guac_protocol_send_name(socket, client_data->hostname);
guac_socket_flush(socket);
/* Set basic handlers */
client->handle_messages = guac_telnet_client_handle_messages;
client->key_handler = guac_telnet_client_key_handler;
client->mouse_handler = guac_telnet_client_mouse_handler;
client->size_handler = guac_telnet_client_size_handler;
client->free_handler = guac_telnet_client_free_handler;
client->clipboard_handler = guac_telnet_clipboard_handler;
/* Start client thread */
if (pthread_create(&(client_data->client_thread), NULL, guac_telnet_client_thread, (void*) client)) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Unable to start telnet client thread");
return -1;
}
/* Success */
return 0;
}
void guac_rdp_client_abort(guac_client* client) {
/*
* NOTE: The RDP status codes translated here are documented within
* [MS-RDPBCGR], section 2.2.5.1.1: "Set Error Info PDU Data", in the
* description of the "errorInfo" field.
*
* https://msdn.microsoft.com/en-us/library/cc240544.aspx
*/
guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
freerdp* rdp_inst = rdp_client->rdp_inst;
guac_protocol_status status;
const char* message;
/* Read disconnect reason code from connection */
int error_info = freerdp_error_info(rdp_inst);
/* Translate reason code into Guacamole protocol status */
switch (error_info) {
/* Normal disconnect */
case 0x0: /* ERRINFO_SUCCESS */
status = GUAC_PROTOCOL_STATUS_SUCCESS;
message = "Disconnected.";
break;
/* Forced disconnect (possibly by admin) */
case 0x1: /* ERRINFO_RPC_INITIATED_DISCONNECT */
status = GUAC_PROTOCOL_STATUS_SESSION_CLOSED;
message = "Forcibly disconnected.";
break;
/* The user was logged off (possibly by admin) */
case 0x2: /* ERRINFO_RPC_INITIATED_LOGOFF */
status = GUAC_PROTOCOL_STATUS_SESSION_CLOSED;
message = "Logged off.";
break;
/* The user was idle long enough that the RDP server disconnected */
case 0x3: /* ERRINFO_IDLE_TIMEOUT */
status = GUAC_PROTOCOL_STATUS_SESSION_TIMEOUT;
message = "Idle session time limit exceeded.";
break;
/* The user's session has been active for too long */
case 0x4: /* ERRINFO_LOGON_TIMEOUT */
status = GUAC_PROTOCOL_STATUS_SESSION_CLOSED;
message = "Active session time limit exceeded.";
break;
/* Another user logged on, disconnecting this user */
case 0x5: /* ERRINFO_DISCONNECTED_BY_OTHER_CONNECTION */
status = GUAC_PROTOCOL_STATUS_SESSION_CONFLICT;
message = "Disconnected by other connection.";
break;
/* The RDP server is refusing to service the connection */
case 0x6: /* ERRINFO_OUT_OF_MEMORY */
case 0x7: /* ERRINFO_SERVER_DENIED_CONNECTION */
status = GUAC_PROTOCOL_STATUS_UPSTREAM_UNAVAILABLE;
message = "Server refused connection.";
break;
/* The user does not have permission to connect */
case 0x9: /* ERRINFO_SERVER_INSUFFICIENT_PRIVILEGES */
status = GUAC_PROTOCOL_STATUS_CLIENT_FORBIDDEN;
message = "Insufficient privileges.";
break;
/* The user's credentials have expired */
case 0xA: /* ERRINFO_SERVER_FRESH_CREDENTIALS_REQUIRED */
status = GUAC_PROTOCOL_STATUS_CLIENT_FORBIDDEN;
message = "Credentials expired.";
break;
/* The user manually disconnected using an administrative tool within
* the session */
case 0xB: /* ERRINFO_RPC_INITIATED_DISCONNECT_BYUSER */
status = GUAC_PROTOCOL_STATUS_SUCCESS;
message = "Manually disconnected.";
break;
/* The user manually logged off */
case 0xC: /* ERRINFO_LOGOFF_BY_USER */
status = GUAC_PROTOCOL_STATUS_SUCCESS;
message = "Manually logged off.";
break;
/* Unimplemented/unknown disconnect reason code */
default:
status = GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR;
message = "Upstream error.";
}
/* Send error code if an error occurred */
if (status != GUAC_PROTOCOL_STATUS_SUCCESS) {
guac_protocol_send_error(client->socket, message, status);
guac_socket_flush(client->socket);
}
/* Log human-readable description of disconnect at info level */
guac_client_log(client, GUAC_LOG_INFO, "RDP server closed connection: %s",
message);
/* Log internal disconnect reason code at debug level */
if (error_info)
guac_client_log(client, GUAC_LOG_DEBUG, "Disconnect reason "
"code: 0x%X.", error_info);
/* Abort connection */
guac_client_stop(client);
}
