guacamole-spice-protocol/libguac/src/client.c

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/*
* 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 <syslog.h>
#include <dlfcn.h>
#include "guacio.h"
#include "protocol.h"
#include "client.h"
png_byte** guac_alloc_png_buffer(int w, int h, int bpp) {
png_byte** png_buffer;
png_byte* row;
int y;
/* Allocate rows for PNG */
png_buffer = (png_byte**) malloc(h * sizeof(png_byte*));
for (y=0; y<h; y++) {
row = (png_byte*) malloc(sizeof(png_byte) * bpp * w);
png_buffer[y] = row;
}
return png_buffer;
}
void guac_free_png_buffer(png_byte** png_buffer, int h) {
int y;
/* Free PNG data */
for (y = 0; y<h; y++)
free(png_buffer[y]);
free(png_buffer);
}
guac_client* __guac_alloc_client(GUACIO* io) {
/* Allocate new client (not handoff) */
guac_client* client = malloc(sizeof(guac_client));
memset(client, 0, sizeof(guac_client));
/* Init new client */
client->io = io;
return client;
}
guac_client* guac_get_client(int client_fd) {
guac_client* client;
GUACIO* io = guac_open(client_fd);
/* Pluggable client */
char protocol_lib[256] = "libguac_client_";
union {
guac_client_init_handler* client_init;
void* obj;
} alias;
char* error;
/* Client arguments */
int argc;
char** argv;
/* Connect instruction */
guac_instruction instruction;
/* Wait for connect instruction */
for (;;) {
int result = guac_read_instruction(io, &instruction);
if (result < 0) {
syslog(LOG_ERR, "Error reading instruction while waiting for connect");
guac_close(io);
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return NULL;
}
/* Connect instruction read */
if (result > 0) {
if (strcmp(instruction.opcode, "connect") == 0) {
/* Get protocol from message */
char* protocol = instruction.argv[0];
strcat(protocol_lib, protocol);
strcat(protocol_lib, ".so");
/* Create new client */
client = __guac_alloc_client(io);
/* Load client plugin */
client->client_plugin_handle = dlopen(protocol_lib, RTLD_LAZY);
if (!(client->client_plugin_handle)) {
syslog(LOG_ERR, "Could not open client plugin for protocol \"%s\": %s\n", protocol, dlerror());
guac_send_error(io, "Could not load server-side client plugin.");
guac_flush(io);
guac_close(io);
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guac_free_instruction_data(&instruction);
return NULL;
}
dlerror(); /* Clear errors */
/* Get init function */
alias.obj = dlsym(client->client_plugin_handle, "guac_client_init");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "Could not get guac_client_init in plugin: %s\n", error);
guac_send_error(io, "Invalid server-side client plugin.");
guac_flush(io);
guac_close(io);
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guac_free_instruction_data(&instruction);
return NULL;
}
/* Initialize client arguments */
argc = instruction.argc;
argv = instruction.argv;
if (alias.client_init(client, argc, argv) != 0) {
/* NOTE: On error, proxy client will send appropriate error message */
guac_free_instruction_data(&instruction);
guac_close(io);
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return NULL;
}
guac_free_instruction_data(&instruction);
return client;
} /* end if connect */
guac_free_instruction_data(&instruction);
}
}
}
void guac_free_client(guac_client* client) {
if (client->free_handler) {
if (client->free_handler(client))
syslog(LOG_ERR, "Error calling client free handler");
}
guac_close(client->io);
/* Unload client plugin */
if (dlclose(client->client_plugin_handle)) {
syslog(LOG_ERR, "Could not close client plugin while unloading client: %s", dlerror());
}
free(client);
}
void guac_start_client(guac_client* client) {
GUACIO* io = client->io;
guac_instruction instruction;
int wait_result;
/* VNC Client Loop */
for (;;) {
/* Handle server messages */
if (client->handle_messages) {
int retval = client->handle_messages(client);
if (retval) {
syslog(LOG_ERR, "Error handling server messages");
return;
}
guac_flush(io);
}
wait_result = guac_instructions_waiting(io);
if (wait_result > 0) {
int retval;
retval = guac_read_instruction(io, &instruction); /* 0 if no instructions finished yet, <0 if error or EOF */
if (retval > 0) {
do {
if (strcmp(instruction.opcode, "mouse") == 0) {
if (client->mouse_handler)
if (
client->mouse_handler(
client,
atoi(instruction.argv[0]), /* x */
atoi(instruction.argv[1]), /* y */
atoi(instruction.argv[2]) /* mask */
)
) {
syslog(LOG_ERR, "Error handling mouse instruction");
guac_free_instruction_data(&instruction);
return;
}
}
else if (strcmp(instruction.opcode, "key") == 0) {
if (client->key_handler)
if (
client->key_handler(
client,
atoi(instruction.argv[0]), /* keysym */
atoi(instruction.argv[1]) /* pressed */
)
) {
syslog(LOG_ERR, "Error handling key instruction");
guac_free_instruction_data(&instruction);
return;
}
}
else if (strcmp(instruction.opcode, "clipboard") == 0) {
if (client->clipboard_handler)
if (
client->clipboard_handler(
client,
guac_unescape_string_inplace(instruction.argv[0]) /* data */
)
) {
syslog(LOG_ERR, "Error handling clipboard instruction");
guac_free_instruction_data(&instruction);
return;
}
}
else if (strcmp(instruction.opcode, "disconnect") == 0) {
syslog(LOG_INFO, "Client requested disconnect");
guac_free_instruction_data(&instruction);
return;
}
guac_free_instruction_data(&instruction);
} while ((retval = guac_read_instruction(io, &instruction)) > 0);
if (retval < 0) {
syslog(LOG_ERR, "Error reading instruction from stream");
return;
}
}
if (retval < 0) {
syslog(LOG_ERR, "Error or end of stream");
return; /* EOF or error */
}
/* Otherwise, retval == 0 implies unfinished instruction */
}
else if (wait_result < 0) {
syslog(LOG_ERR, "Error waiting for next instruction");
return;
}
}
}