492 lines
15 KiB
C
492 lines
15 KiB
C
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is libguac.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <stdlib.h>
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#include <stdio.h>
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#ifdef HAVE_CLOCK_GETTIME
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#include <time.h>
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#else
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#include <sys/time.h>
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#endif
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#include <string.h>
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#include <dlfcn.h>
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#include "log.h"
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#include "guacio.h"
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#include "protocol.h"
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#include "client.h"
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png_byte** guac_alloc_png_buffer(int w, int h, int bpp) {
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png_byte** png_buffer;
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png_byte* row;
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int y;
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/* Allocate rows for PNG */
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png_buffer = (png_byte**) malloc(h * sizeof(png_byte*));
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for (y=0; y<h; y++) {
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row = (png_byte*) malloc(sizeof(png_byte) * bpp * w);
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png_buffer[y] = row;
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}
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return png_buffer;
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}
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void guac_free_png_buffer(png_byte** png_buffer, int h) {
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int y;
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/* Free PNG data */
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for (y = 0; y<h; y++)
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free(png_buffer[y]);
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free(png_buffer);
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}
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guac_client* __guac_alloc_client(GUACIO* io) {
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/* Allocate new client (not handoff) */
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guac_client* client = malloc(sizeof(guac_client));
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memset(client, 0, sizeof(guac_client));
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/* Init new client */
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client->io = io;
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return client;
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}
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guac_client* guac_get_client(int client_fd) {
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guac_client* client;
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GUACIO* io = guac_open(client_fd);
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/* Pluggable client */
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char protocol_lib[256] = "libguac-client-";
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union {
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guac_client_init_handler* client_init;
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void* obj;
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} alias;
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char* error;
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/* Client args description */
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const char** client_args;
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/* Client arguments */
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int argc;
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char** argv;
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/* Instruction */
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guac_instruction instruction;
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/* Wait for select instruction */
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for (;;) {
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int result;
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/* Wait for data until timeout */
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result = guac_select(io, GUAC_USEC_TIMEOUT);
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if (result == 0) {
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guac_send_error(io, "Select timeout.");
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guac_close(io);
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return NULL;
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}
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/* If error occurs while waiting, exit with failure */
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if (result < 0) {
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guac_close(io);
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return NULL;
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}
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result = guac_read_instruction(io, &instruction);
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if (result < 0) {
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guac_close(io);
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return NULL;
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}
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/* Select instruction read */
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if (result > 0) {
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if (strcmp(instruction.opcode, "select") == 0) {
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/* Get protocol from message */
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char* protocol = instruction.argv[0];
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strcat(protocol_lib, protocol);
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strcat(protocol_lib, ".so");
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/* Create new client */
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client = __guac_alloc_client(io);
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/* Load client plugin */
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client->client_plugin_handle = dlopen(protocol_lib, RTLD_LAZY);
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if (!(client->client_plugin_handle)) {
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GUAC_LOG_ERROR("Could not open client plugin for protocol \"%s\": %s\n", protocol, dlerror());
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guac_send_error(io, "Could not load server-side client plugin.");
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guac_flush(io);
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guac_close(io);
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guac_free_instruction_data(&instruction);
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return NULL;
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}
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dlerror(); /* Clear errors */
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/* Get init function */
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alias.obj = dlsym(client->client_plugin_handle, "guac_client_init");
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if ((error = dlerror()) != NULL) {
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GUAC_LOG_ERROR("Could not get guac_client_init in plugin: %s\n", error);
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guac_send_error(io, "Invalid server-side client plugin.");
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guac_flush(io);
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guac_close(io);
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guac_free_instruction_data(&instruction);
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return NULL;
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}
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/* Get usage strig */
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client_args = (const char**) dlsym(client->client_plugin_handle, "GUAC_CLIENT_ARGS");
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if ((error = dlerror()) != NULL) {
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GUAC_LOG_ERROR("Could not get GUAC_CLIENT_ in plugin: %s\n", error);
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guac_send_error(io, "Invalid server-side client plugin.");
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guac_flush(io);
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guac_close(io);
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guac_free_instruction_data(&instruction);
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return NULL;
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}
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/* Send args */
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guac_send_args(io, client_args);
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guac_flush(io);
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guac_free_instruction_data(&instruction);
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break;
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} /* end if select */
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guac_free_instruction_data(&instruction);
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}
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}
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/* Wait for connect instruction */
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for (;;) {
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int result;
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/* Wait for data until timeout */
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result = guac_select(io, GUAC_USEC_TIMEOUT);
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if (result == 0) {
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guac_send_error(io, "Connect timeout.");
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guac_close(io);
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return NULL;
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}
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/* If error occurs while waiting, exit with failure */
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if (result < 0) {
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guac_close(io);
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return NULL;
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}
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result = guac_read_instruction(io, &instruction);
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if (result < 0) {
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GUAC_LOG_ERROR("Error reading instruction while waiting for connect");
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guac_close(io);
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return NULL;
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}
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/* Connect instruction read */
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if (result > 0) {
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if (strcmp(instruction.opcode, "connect") == 0) {
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/* Initialize client arguments */
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argc = instruction.argc;
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argv = instruction.argv;
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if (alias.client_init(client, argc, argv) != 0) {
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/* NOTE: On error, proxy client will send appropriate error message */
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guac_free_instruction_data(&instruction);
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guac_close(io);
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return NULL;
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}
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guac_free_instruction_data(&instruction);
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return client;
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} /* end if connect */
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guac_free_instruction_data(&instruction);
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}
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}
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}
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void guac_free_client(guac_client* client) {
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if (client->free_handler) {
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if (client->free_handler(client))
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GUAC_LOG_ERROR("Error calling client free handler");
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}
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guac_close(client->io);
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/* Unload client plugin */
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if (dlclose(client->client_plugin_handle)) {
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GUAC_LOG_ERROR("Could not close client plugin while unloading client: %s", dlerror());
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}
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free(client);
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}
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long __guac_current_timestamp() {
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#ifdef HAVE_CLOCK_GETTIME
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struct timespec current;
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/* Get current time */
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clock_gettime(CLOCK_REALTIME, ¤t);
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/* Calculate milliseconds */
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return current.tv_sec * 1000 + current.tv_nsec / 1000000;
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#else
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struct timeval current;
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/* Get current time */
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gettimeofday(¤t, NULL);
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/* Calculate milliseconds */
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return current.tv_sec * 1000 + current.tv_usec / 1000;
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#endif
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}
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void __guac_sleep(int millis) {
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#ifdef HAVE_NANOSLEEP
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struct timespec sleep_period;
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sleep_period.tv_sec = 0;
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sleep_period.tv_nsec = millis * 1000000L;
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nanosleep(&sleep_period, NULL);
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#elif defined(__MINGW32__)
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Sleep(millis)
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#else
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#warning No sleep/nanosleep function available. Clients may not perform as expected. Consider patching libguac to add support for your platform.
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#endif
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}
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void guac_start_client(guac_client* client) {
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GUACIO* io = client->io;
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guac_instruction instruction;
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int wait_result;
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long last_received_timestamp;
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long last_sent_timestamp;
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/* Init timestamps */
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last_received_timestamp = last_sent_timestamp = __guac_current_timestamp();
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/* VNC Client Loop */
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for (;;) {
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/* Get current time and check timeout */
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long timestamp = __guac_current_timestamp();
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if (timestamp - last_received_timestamp > GUAC_TIMEOUT) {
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guac_send_error(io, "Sync timeout.");
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guac_flush(io);
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return;
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}
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/* If not timed out, ping client with sync */
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if (timestamp - last_sent_timestamp > GUAC_SYNC_FREQUENCY) {
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last_sent_timestamp = timestamp;
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guac_send_sync(io, last_sent_timestamp);
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guac_flush(io);
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}
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/* Handle server messages */
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if (client->handle_messages) {
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/* Get previous GUACIO state */
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int last_total_written = io->total_written;
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/* Only handle messages if synced within threshold */
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if (last_sent_timestamp - last_received_timestamp
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< GUAC_SYNC_THRESHOLD) {
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int retval = client->handle_messages(client);
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if (retval) {
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GUAC_LOG_ERROR("Error handling server messages");
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return;
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}
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/* If data was written during message handling */
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if (io->total_written != last_total_written) {
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/* Sleep as necessary */
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__guac_sleep(GUAC_SERVER_MESSAGE_HANDLE_FREQUENCY);
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/* Update sync timestamp and send sync instruction */
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last_sent_timestamp = __guac_current_timestamp();
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guac_send_sync(io, last_sent_timestamp);
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}
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guac_flush(io);
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}
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}
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wait_result = guac_instructions_waiting(io);
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if (wait_result > 0) {
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int retval;
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retval = guac_read_instruction(io, &instruction); /* 0 if no instructions finished yet, <0 if error or EOF */
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if (retval > 0) {
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do {
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if (strcmp(instruction.opcode, "sync") == 0) {
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last_received_timestamp = atol(instruction.argv[0]);
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if (last_received_timestamp > last_sent_timestamp) {
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guac_send_error(io, "Received sync from future.");
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guac_free_instruction_data(&instruction);
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return;
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}
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}
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else if (strcmp(instruction.opcode, "mouse") == 0) {
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if (client->mouse_handler)
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if (
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client->mouse_handler(
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client,
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atoi(instruction.argv[0]), /* x */
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atoi(instruction.argv[1]), /* y */
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atoi(instruction.argv[2]) /* mask */
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)
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) {
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GUAC_LOG_ERROR("Error handling mouse instruction");
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guac_free_instruction_data(&instruction);
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return;
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}
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}
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else if (strcmp(instruction.opcode, "key") == 0) {
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if (client->key_handler)
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if (
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client->key_handler(
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client,
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atoi(instruction.argv[0]), /* keysym */
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atoi(instruction.argv[1]) /* pressed */
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)
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) {
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GUAC_LOG_ERROR("Error handling key instruction");
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guac_free_instruction_data(&instruction);
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return;
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}
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}
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else if (strcmp(instruction.opcode, "clipboard") == 0) {
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if (client->clipboard_handler)
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if (
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client->clipboard_handler(
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client,
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guac_unescape_string_inplace(instruction.argv[0]) /* data */
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)
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) {
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GUAC_LOG_ERROR("Error handling clipboard instruction");
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guac_free_instruction_data(&instruction);
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return;
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}
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}
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else if (strcmp(instruction.opcode, "disconnect") == 0) {
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GUAC_LOG_INFO("Client requested disconnect");
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guac_free_instruction_data(&instruction);
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return;
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}
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guac_free_instruction_data(&instruction);
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} while ((retval = guac_read_instruction(io, &instruction)) > 0);
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if (retval < 0) {
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GUAC_LOG_ERROR("Error reading instruction from stream");
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return;
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}
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}
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if (retval < 0) {
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GUAC_LOG_ERROR("Error or end of stream");
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return; /* EOF or error */
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}
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/* Otherwise, retval == 0 implies unfinished instruction */
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}
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else if (wait_result < 0) {
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GUAC_LOG_ERROR("Error waiting for next instruction");
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return;
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}
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}
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}
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