guacamole-spice-protocol/protocols/vnc/src/vnc_client.c

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2010-12-08 21:14:04 +00:00
/*
* Guacamole - Clientless Remote Desktop
* Copyright (C) 2010 Michael Jumper
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <png.h>
#include <time.h>
#include <syslog.h>
#include <rfb/rfbclient.h>
#include <guacamole/guacio.h>
#include <guacamole/protocol.h>
#include <guacamole/client.h>
static char* __GUAC_CLIENT = "GUAC_CLIENT";
typedef struct vnc_guac_client_data {
rfbClient* rfb_client;
png_byte** png_buffer;
png_byte** png_buffer_alpha;
int copy_rect_used;
char* password;
} vnc_guac_client_data;
void guac_vnc_cursor(rfbClient* client, int x, int y, int w, int h, int bpp) {
int dx, dy;
guac_client* gc = rfbClientGetClientData(client, __GUAC_CLIENT);
GUACIO* io = gc->io;
png_byte** png_buffer = ((vnc_guac_client_data*) gc->data)->png_buffer_alpha;
png_byte* row;
png_byte** png_row_current = png_buffer;
unsigned int bytesPerRow = bpp * w;
unsigned char* fb_row_current = client->rcSource;
unsigned char* fb_mask = client->rcMask;
unsigned char* fb_row;
unsigned int v;
/* Copy image data from VNC client to PNG */
for (dy = 0; dy<h; dy++) {
row = *(png_row_current++);
fb_row = fb_row_current;
fb_row_current += bytesPerRow;
for (dx = 0; dx<w; dx++) {
switch (bpp) {
case 4:
v = *((unsigned int*) fb_row);
break;
case 2:
v = *((unsigned short*) fb_row);
break;
default:
v = *((unsigned char*) fb_row);
}
*(row++) = (v >> client->format.redShift) * 256 / (client->format.redMax+1);
*(row++) = (v >> client->format.greenShift) * 256 / (client->format.greenMax+1);
*(row++) = (v >> client->format.blueShift) * 256 / (client->format.blueMax+1);
/* Handle mask */
if (*(fb_mask++))
*(row++) = 255;
else
*(row++) = 0;
fb_row += bpp;
}
}
/* SEND CURSOR */
guac_send_cursor(io, x, y, png_buffer, w, h);
}
void guac_vnc_update(rfbClient* client, int x, int y, int w, int h) {
int dx, dy;
guac_client* gc = rfbClientGetClientData(client, __GUAC_CLIENT);
GUACIO* io = gc->io;
png_byte** png_buffer = ((vnc_guac_client_data*) gc->data)->png_buffer;
png_byte* row;
png_byte** png_row_current = png_buffer;
unsigned int bpp = client->format.bitsPerPixel/8;
unsigned int bytesPerRow = bpp * client->width;
unsigned char* fb_row_current = client->frameBuffer + (y * bytesPerRow) + (x * bpp);
unsigned char* fb_row;
unsigned int v;
/* Ignore extra update if already handled by copyrect */
if (((vnc_guac_client_data*) gc->data)->copy_rect_used) {
((vnc_guac_client_data*) gc->data)->copy_rect_used = 0;
return;
}
/* Copy image data from VNC client to PNG */
for (dy = y; dy<y+h; dy++) {
row = *(png_row_current++);
fb_row = fb_row_current;
fb_row_current += bytesPerRow;
for (dx = x; dx<x+w; dx++) {
switch (bpp) {
case 4:
v = *((unsigned int*) fb_row);
break;
case 2:
v = *((unsigned short*) fb_row);
break;
default:
v = *((unsigned char*) fb_row);
}
*(row++) = (v >> client->format.redShift) * 256 / (client->format.redMax+1);
*(row++) = (v >> client->format.greenShift) * 256 / (client->format.greenMax+1);
*(row++) = (v >> client->format.blueShift) * 256 / (client->format.blueMax+1);
fb_row += bpp;
}
}
guac_send_png(io, x, y, png_buffer, w, h);
}
void guac_vnc_copyrect(rfbClient* client, int src_x, int src_y, int w, int h, int dest_x, int dest_y) {
guac_client* gc = rfbClientGetClientData(client, __GUAC_CLIENT);
GUACIO* io = gc->io;
guac_send_copy(io, src_x, src_y, w, h, dest_x, dest_y);
((vnc_guac_client_data*) gc->data)->copy_rect_used = 1;
}
char* guac_vnc_get_password(rfbClient* client) {
guac_client* gc = rfbClientGetClientData(client, __GUAC_CLIENT);
return ((vnc_guac_client_data*) gc->data)->password;
}
void guac_vnc_cut_text(rfbClient* client, const char* text, int textlen) {
guac_client* gc = rfbClientGetClientData(client, __GUAC_CLIENT);
GUACIO* io = gc->io;
guac_send_clipboard(io, text);
}
int vnc_guac_client_handle_messages(guac_client* client) {
int wait_result;
rfbClient* rfb_client = ((vnc_guac_client_data*) client->data)->rfb_client;
wait_result = WaitForMessage(rfb_client, 2000);
if (wait_result < 0) {
syslog(LOG_ERR, "Error waiting for VNC server message\n");
return 1;
}
if (wait_result > 0) {
struct timespec sleep_period;
if (!HandleRFBServerMessage(rfb_client)) {
syslog(LOG_ERR, "Error handling VNC server message\n");
return 1;
}
/* Wait before returning ... don't want to handle
* too many server messages. */
sleep_period.tv_sec = 0;
sleep_period.tv_nsec = 50000000L /* 50 ms */;
nanosleep(&sleep_period, NULL);
}
return 0;
}
int vnc_guac_client_mouse_handler(guac_client* client, int x, int y, int mask) {
rfbClient* rfb_client = ((vnc_guac_client_data*) client->data)->rfb_client;
SendPointerEvent(rfb_client, x, y, mask);
return 0;
}
int vnc_guac_client_key_handler(guac_client* client, int keysym, int pressed) {
rfbClient* rfb_client = ((vnc_guac_client_data*) client->data)->rfb_client;
SendKeyEvent(rfb_client, keysym, pressed);
return 0;
}
int vnc_guac_client_clipboard_handler(guac_client* client, char* data) {
rfbClient* rfb_client = ((vnc_guac_client_data*) client->data)->rfb_client;
SendClientCutText(rfb_client, data, strlen(data));
return 0;
}
int vnc_guac_client_free_handler(guac_client* client) {
rfbClient* rfb_client = ((vnc_guac_client_data*) client->data)->rfb_client;
png_byte** png_buffer = ((vnc_guac_client_data*) client->data)->png_buffer;
png_byte** png_buffer_alpha = ((vnc_guac_client_data*) client->data)->png_buffer_alpha;
/* Free PNG data */
guac_free_png_buffer(png_buffer, rfb_client->height);
guac_free_png_buffer(png_buffer_alpha, rfb_client->height);
/* Clean up VNC client*/
rfbClientCleanup(rfb_client);
return 0;
}
int guac_client_init(guac_client* client, int argc, char** argv) {
rfbClient* rfb_client;
png_byte** png_buffer;
png_byte** png_buffer_alpha;
vnc_guac_client_data* guac_client_data;
/*** INIT ***/
rfb_client = rfbGetClient(8, 3, 4); /* 32-bpp client */
/* Framebuffer update handler */
rfb_client->GotFrameBufferUpdate = guac_vnc_update;
rfb_client->GotCopyRect = guac_vnc_copyrect;
/* Enable client-side cursor */
rfb_client->GotCursorShape = guac_vnc_cursor;
rfb_client->appData.useRemoteCursor = TRUE;
/* Clipboard */
rfb_client->GotXCutText = guac_vnc_cut_text;
/* Password */
rfb_client->GetPassword = guac_vnc_get_password;
if (argc < 3) {
guac_send_error(client->io, "VNC client requires hostname and port arguments");
guac_flush(client->io);
return 1;
}
/* Alloc client data */
guac_client_data = malloc(sizeof(vnc_guac_client_data));
client->data = guac_client_data;
/* Store Guac client in rfb client */
rfbClientSetClientData(rfb_client, __GUAC_CLIENT, client);
/* Parse password from args if provided */
if (argc >= 4) {
/* Freed after use by libvncclient */
guac_client_data->password = malloc(64);
strncpy(guac_client_data->password, argv[3], 63);
}
else {
/* Freed after use by libvncclient */
guac_client_data->password = malloc(64);
guac_client_data->password[0] = '\0';
}
/* Set hostname and port */
rfb_client->serverHost = strdup(argv[1]);
rfb_client->serverPort = atoi(argv[2]);
/* Connect */
if (!rfbInitClient(rfb_client, NULL, NULL)) {
guac_send_error(client->io, "Error initializing VNC client");
guac_flush(client->io);
return 1;
}
/* Allocate buffers */
png_buffer = guac_alloc_png_buffer(rfb_client->width, rfb_client->height, 3); /* No-alpha */
png_buffer_alpha = guac_alloc_png_buffer(rfb_client->width, rfb_client->height, 4); /* With alpha */
/* Set remaining client data */
guac_client_data->rfb_client = rfb_client;
guac_client_data->png_buffer = png_buffer;
guac_client_data->png_buffer_alpha = png_buffer_alpha;
guac_client_data->copy_rect_used = 0;
/* Set handlers */
client->handle_messages = vnc_guac_client_handle_messages;
client->mouse_handler = vnc_guac_client_mouse_handler;
client->key_handler = vnc_guac_client_key_handler;
client->clipboard_handler = vnc_guac_client_clipboard_handler;
/* Send name */
guac_send_name(client->io, rfb_client->desktopName);
/* Send size */
guac_send_size(client->io, rfb_client->width, rfb_client->height);
return 0;
}