301 lines
8.9 KiB
C
301 lines
8.9 KiB
C
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/*
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* Guacamole - Clientless Remote Desktop
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* Copyright (C) 2010 Michael Jumper
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <dlfcn.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 arguments */
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int argc;
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char** argv;
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/* Connect instruction */
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guac_instruction instruction;
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/* Wait for connect instruction */
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for (;;) {
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int result = guac_read_instruction(io, &instruction);
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if (result < 0) {
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syslog(LOG_ERR, "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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/* 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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syslog(LOG_ERR, "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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syslog(LOG_ERR, "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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/* 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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syslog(LOG_ERR, "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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syslog(LOG_ERR, "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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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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/* VNC Client Loop */
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for (;;) {
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/* Handle server messages */
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if (client->handle_messages) {
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int retval = client->handle_messages(client);
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if (retval) {
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syslog(LOG_ERR, "Error handling server messages");
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return;
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}
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guac_flush(io);
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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, "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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syslog(LOG_ERR, "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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syslog(LOG_ERR, "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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syslog(LOG_ERR, "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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syslog(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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syslog(LOG_ERR, "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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syslog(LOG_ERR, "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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syslog(LOG_ERR, "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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