| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #include "config.h" |
| #include "argv.h" |
| #include "telnet.h" |
| #include "terminal/terminal.h" |
| |
| #include <guacamole/protocol.h> |
| #include <guacamole/socket.h> |
| #include <guacamole/user.h> |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| /** |
| * All telnet connection settings which may be updated by unprivileged users |
| * through "argv" streams. |
| */ |
| typedef enum guac_telnet_argv_setting { |
| |
| /** |
| * The color scheme of the terminal. |
| */ |
| GUAC_TELNET_ARGV_SETTING_COLOR_SCHEME, |
| |
| /** |
| * The name of the font family used by the terminal. |
| */ |
| GUAC_TELNET_ARGV_SETTING_FONT_NAME, |
| |
| /** |
| * The size of the font used by the terminal, in points. |
| */ |
| GUAC_TELNET_ARGV_SETTING_FONT_SIZE |
| |
| } guac_telnet_argv_setting; |
| |
| /** |
| * The value or current status of a connection parameter received over an |
| * "argv" stream. |
| */ |
| typedef struct guac_telnet_argv { |
| |
| /** |
| * The specific setting being updated. |
| */ |
| guac_telnet_argv_setting setting; |
| |
| /** |
| * Buffer space for containing the received argument value. |
| */ |
| char buffer[GUAC_TELNET_ARGV_MAX_LENGTH]; |
| |
| /** |
| * The number of bytes received so far. |
| */ |
| int length; |
| |
| } guac_telnet_argv; |
| |
| /** |
| * Handler for "blob" instructions which appends the data from received blobs |
| * to the end of the in-progress argument value buffer. |
| * |
| * @see guac_user_blob_handler |
| */ |
| static int guac_telnet_argv_blob_handler(guac_user* user, |
| guac_stream* stream, void* data, int length) { |
| |
| guac_telnet_argv* argv = (guac_telnet_argv*) stream->data; |
| |
| /* Calculate buffer size remaining, including space for null terminator, |
| * adjusting received length accordingly */ |
| int remaining = sizeof(argv->buffer) - argv->length - 1; |
| if (length > remaining) |
| length = remaining; |
| |
| /* Append received data to end of buffer */ |
| memcpy(argv->buffer + argv->length, data, length); |
| argv->length += length; |
| |
| return 0; |
| |
| } |
| |
| /** |
| * Handler for "end" instructions which applies the changes specified by the |
| * argument value buffer associated with the stream. |
| * |
| * @see guac_user_end_handler |
| */ |
| static int guac_telnet_argv_end_handler(guac_user* user, |
| guac_stream* stream) { |
| |
| int size; |
| |
| guac_client* client = user->client; |
| guac_telnet_client* telnet_client = (guac_telnet_client*) client->data; |
| guac_terminal* terminal = telnet_client->term; |
| |
| /* Append null terminator to value */ |
| guac_telnet_argv* argv = (guac_telnet_argv*) stream->data; |
| argv->buffer[argv->length] = '\0'; |
| |
| /* Apply changes to chosen setting */ |
| switch (argv->setting) { |
| |
| /* Update color scheme */ |
| case GUAC_TELNET_ARGV_SETTING_COLOR_SCHEME: |
| guac_terminal_apply_color_scheme(terminal, argv->buffer); |
| guac_client_stream_argv(client, client->socket, "text/plain", |
| "color-scheme", argv->buffer); |
| break; |
| |
| /* Update font name */ |
| case GUAC_TELNET_ARGV_SETTING_FONT_NAME: |
| guac_terminal_apply_font(terminal, argv->buffer, -1, 0); |
| guac_client_stream_argv(client, client->socket, "text/plain", |
| "font-name", argv->buffer); |
| break; |
| |
| /* Update font size */ |
| case GUAC_TELNET_ARGV_SETTING_FONT_SIZE: |
| |
| /* Update only if font size is sane */ |
| size = atoi(argv->buffer); |
| if (size > 0) { |
| guac_terminal_apply_font(terminal, NULL, size, |
| telnet_client->settings->resolution); |
| guac_client_stream_argv(client, client->socket, "text/plain", |
| "font-size", argv->buffer); |
| } |
| |
| break; |
| |
| } |
| |
| /* Update terminal window size if connected */ |
| if (telnet_client->telnet != NULL && telnet_client->naws_enabled) |
| guac_telnet_send_naws(telnet_client->telnet, terminal->term_width, |
| terminal->term_height); |
| |
| free(argv); |
| return 0; |
| |
| } |
| |
| int guac_telnet_argv_handler(guac_user* user, guac_stream* stream, |
| char* mimetype, char* name) { |
| |
| guac_telnet_argv_setting setting; |
| |
| /* Allow users to update the color scheme and font details */ |
| if (strcmp(name, "color-scheme") == 0) |
| setting = GUAC_TELNET_ARGV_SETTING_COLOR_SCHEME; |
| else if (strcmp(name, "font-name") == 0) |
| setting = GUAC_TELNET_ARGV_SETTING_FONT_NAME; |
| else if (strcmp(name, "font-size") == 0) |
| setting = GUAC_TELNET_ARGV_SETTING_FONT_SIZE; |
| |
| /* No other connection parameters may be updated */ |
| else { |
| guac_protocol_send_ack(user->socket, stream, "Not allowed.", |
| GUAC_PROTOCOL_STATUS_CLIENT_FORBIDDEN); |
| guac_socket_flush(user->socket); |
| return 0; |
| } |
| |
| guac_telnet_argv* argv = malloc(sizeof(guac_telnet_argv)); |
| argv->setting = setting; |
| argv->length = 0; |
| |
| /* Prepare stream to receive argument value */ |
| stream->blob_handler = guac_telnet_argv_blob_handler; |
| stream->end_handler = guac_telnet_argv_end_handler; |
| stream->data = argv; |
| |
| /* Signal stream is ready */ |
| guac_protocol_send_ack(user->socket, stream, "Ready for updated " |
| "parameter.", GUAC_PROTOCOL_STATUS_SUCCESS); |
| guac_socket_flush(user->socket); |
| return 0; |
| |
| } |
| |
| void* guac_telnet_send_current_argv(guac_user* user, void* data) { |
| |
| guac_telnet_client* telnet_client = (guac_telnet_client*) data; |
| guac_terminal* terminal = telnet_client->term; |
| |
| /* Send current color scheme */ |
| guac_user_stream_argv(user, user->socket, "text/plain", "color-scheme", |
| terminal->color_scheme); |
| |
| /* Send current font name */ |
| guac_user_stream_argv(user, user->socket, "text/plain", "font-name", |
| terminal->font_name); |
| |
| /* Send current font size */ |
| char font_size[64]; |
| sprintf(font_size, "%i", terminal->font_size); |
| guac_user_stream_argv(user, user->socket, "text/plain", "font-size", |
| font_size); |
| |
| return NULL; |
| |
| } |
| |