/*
* 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 "client.h"
#include "keyboard.h"
#include "rdp.h"
#include "rdp_keymap.h"
#include <freerdp/freerdp.h>
#include <freerdp/input.h>
#include <guacamole/client.h>
#include <pthread.h>
#include <stdlib.h>
/**
* Immediately sends an RDP key event having the given scancode and flags.
*
* @param rdp_client
* The RDP client instance associated with the RDP session along which the
* key event should be sent.
*
* @param scancode
* The scancode of the key to press or release via the RDP key event.
*
* @param flags
* Any RDP-specific flags required for the provided scancode to have the
* intended meaning, such as KBD_FLAGS_EXTENDED. The possible flags and
* their meanings are dictated by RDP. KBD_FLAGS_DOWN and KBD_FLAGS_UP
* need not be specified here - they will automatically be added depending
* on the value specified for the pressed parameter.
*
* @param pressed
* Non-zero if the key is being pressed, zero if the key is being released.
*/
static void guac_rdp_send_key_event(guac_rdp_client* rdp_client,
int scancode, int flags, int pressed) {
/* Determine proper event flag for pressed state */
int pressed_flags;
if (pressed)
pressed_flags = KBD_FLAGS_DOWN;
else
pressed_flags = KBD_FLAGS_RELEASE;
pthread_mutex_lock(&(rdp_client->rdp_lock));
/* Skip if not yet connected */
freerdp* rdp_inst = rdp_client->rdp_inst;
if (rdp_inst == NULL) {
pthread_mutex_unlock(&(rdp_client->rdp_lock));
return;
}
/* Send actual key */
rdp_inst->input->KeyboardEvent(rdp_inst->input,
flags | pressed_flags, scancode);
pthread_mutex_unlock(&(rdp_client->rdp_lock));
}
/**
* Immediately sends an RDP Unicode event having the given Unicode codepoint.
* Unlike key events, RDP Unicode events do have not a pressed or released
* state. They represent strictly the input of a single character, and are
* technically independent of the keyboard.
*
* @param rdp_client
* The RDP client instance associated with the RDP session along which the
* Unicode event should be sent.
*
* @param codepoint
* The Unicode codepoint of the character being input via the Unicode
* event.
*/
static void guac_rdp_send_unicode_event(guac_rdp_client* rdp_client,
int codepoint) {
pthread_mutex_lock(&(rdp_client->rdp_lock));
/* Skip if not yet connected */
freerdp* rdp_inst = rdp_client->rdp_inst;
if (rdp_inst == NULL) {
pthread_mutex_unlock(&(rdp_client->rdp_lock));
return;
}
/* Send Unicode event */
rdp_inst->input->UnicodeKeyboardEvent(
rdp_inst->input,
0, codepoint);
pthread_mutex_unlock(&(rdp_client->rdp_lock));
}
/**
* Loads all keysym/scancode mappings declared within the given keymap and its
* parent keymap, if any. These mappings are stored within the given
* guac_rdp_keyboard structure for future use in translating keysyms to the
* scancodes required by RDP key events.
*
* @param keyboard
* The guac_rdp_keyboard which should be initialized with the
* keysym/scancode mapping defined in the given keymap.
*
* @param keymap
* The keymap to use to populate the given client's keysym/scancode
* mapping.
*/
static void __guac_rdp_keyboard_load_keymap(guac_rdp_keyboard* keyboard,
const guac_rdp_keymap* keymap) {
/* Get mapping */
const guac_rdp_keysym_desc* mapping = keymap->mapping;
/* If parent exists, load parent first */
if (keymap->parent != NULL)
__guac_rdp_keyboard_load_keymap(keyboard, keymap->parent);
/* Log load */
guac_client_log(keyboard->client, GUAC_LOG_INFO,
"Loading keymap \"%s\"", keymap->name);
/* Load mapping into keymap */
while (mapping->keysym != 0) {
/* Copy mapping */
GUAC_RDP_KEYSYM_LOOKUP(keyboard->keymap, mapping->keysym) = *mapping;
/* Next keysym */
mapping++;
}
}
guac_rdp_keyboard* guac_rdp_keyboard_alloc(guac_client* client,
const guac_rdp_keymap* keymap) {
guac_rdp_keyboard* keyboard = calloc(1, sizeof(guac_rdp_keyboard));
keyboard->client = client;
/* Load keymap into keyboard */
__guac_rdp_keyboard_load_keymap(keyboard, keymap);
return keyboard;
}
void guac_rdp_keyboard_free(guac_rdp_keyboard* keyboard) {
free(keyboard);
}
int guac_rdp_keyboard_send_event(guac_rdp_keyboard* keyboard,
int keysym, int pressed) {
guac_client* client = keyboard->client;
guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
/* If keysym can be in lookup table */
if (GUAC_RDP_KEYSYM_STORABLE(keysym)) {
/* Look up scancode mapping */
const guac_rdp_keysym_desc* keysym_desc =
&GUAC_RDP_KEYSYM_LOOKUP(keyboard->keymap, keysym);
/* If defined, send event */
if (keysym_desc->scancode != 0) {
/* If defined, send any prerequesite keys that must be set */
if (keysym_desc->set_keysyms != NULL)
guac_rdp_keyboard_send_events(keyboard,
keysym_desc->set_keysyms, 0, 1);
/* If defined, release any keys that must be cleared */
if (keysym_desc->clear_keysyms != NULL)
guac_rdp_keyboard_send_events(keyboard,
keysym_desc->clear_keysyms, 1, 0);
/* Fire actual key event for target key */
guac_rdp_send_key_event(rdp_client, keysym_desc->scancode,
keysym_desc->flags, pressed);
/* If defined, release any keys that were originally released */
if (keysym_desc->set_keysyms != NULL)
guac_rdp_keyboard_send_events(keyboard,
keysym_desc->set_keysyms, 0, 0);
/* If defined, send any keys that were originally set */
if (keysym_desc->clear_keysyms != NULL)
guac_rdp_keyboard_send_events(keyboard,
keysym_desc->clear_keysyms, 1, 1);
return 0;
}
}
/* Fall back to unicode events if undefined inside current keymap */
/* Only send when key pressed - Unicode events do not have
* DOWN/RELEASE flags */
if (pressed) {
guac_client_log(client, GUAC_LOG_DEBUG,
"Sending keysym 0x%x as Unicode", keysym);
/* Translate keysym into codepoint */
int codepoint;
if (keysym <= 0xFF)
codepoint = keysym;
else if (keysym >= 0x1000000)
codepoint = keysym & 0xFFFFFF;
else {
guac_client_log(client, GUAC_LOG_DEBUG,
"Unmapped keysym has no equivalent unicode "
"value: 0x%x", keysym);
return 0;
}
/* Send as Unicode event */
guac_rdp_send_unicode_event(rdp_client, codepoint);
}
return 0;
}
void guac_rdp_keyboard_send_events(guac_rdp_keyboard* keyboard,
const int* keysym_string, int from, int to) {
int keysym;
/* Send all keysyms in string, NULL terminated */
while ((keysym = *keysym_string) != 0) {
/* Get current keysym state */
int current_state =
GUAC_RDP_KEYSYM_LOOKUP(keyboard->keysym_state, keysym);
/* If key is currently in given state, send event for changing it to
* specified "to" state */
if (current_state == from)
guac_rdp_keyboard_send_event(keyboard, *keysym_string, to);
/* Next keysym */
keysym_string++;
}
}
int guac_rdp_keyboard_update_keysym(guac_rdp_keyboard* keyboard,
int keysym, int pressed) {
/* Update keysym state */
if (GUAC_RDP_KEYSYM_STORABLE(keysym))
GUAC_RDP_KEYSYM_LOOKUP(keyboard->keysym_state, keysym) = pressed;
return guac_rdp_keyboard_send_event(keyboard, keysym, pressed);
}