/**
* Starts protocol-specific handling on the given process by loading the client
* plugin for that protocol. This function does NOT return. It initializes the
* process with protocol-specific handlers and then runs until the guacd_proc's
* fd_socket is closed, adding any file descriptors received along fd_socket as
* new users.
*
* @param proc
* The process that any new users received along fd_socket should be added
* to (after the process has been initialized for the given protocol).
*
* @param protocol
* The protocol to initialize the given process for.
*/
static void guacd_exec_proc(guacd_proc* proc, const char* protocol) {
/* Init client for selected protocol */
if (guac_client_load_plugin(proc->client, protocol)) {
/* Log error */
if (guac_error == GUAC_STATUS_NOT_FOUND)
guacd_log(GUAC_LOG_WARNING,
"Support for protocol \"%s\" is not installed", protocol);
else
guacd_log_guac_error(GUAC_LOG_ERROR,
"Unable to load client plugin");
guac_client_free(proc->client);
close(proc->fd_socket);
free(proc);
exit(1);
}
/* The first file descriptor is the owner */
int owner = 1;
/* Add each received file descriptor as a new user */
int received_fd;
while ((received_fd = guacd_recv_fd(proc->fd_socket)) != -1) {
guacd_proc_add_user(proc, received_fd, owner);
/* Future file descriptors are not owners */
owner = 0;
}
/* Stop and free client */
guac_client_stop(proc->client);
guac_client_free(proc->client);
/* Child is finished */
close(proc->fd_socket);
free(proc);
exit(0);
}
void test_layer_pool() {
guac_client* client;
int i;
int seen[GUAC_BUFFER_POOL_INITIAL_SIZE] = {0};
guac_layer* layer;
/* Get client */
client = guac_client_alloc();
CU_ASSERT_PTR_NOT_NULL_FATAL(client);
/* Fill pool */
for (i=0; i<GUAC_BUFFER_POOL_INITIAL_SIZE; i++) {
/* Allocate and throw away a buffer (should not disturb layer alloc) */
CU_ASSERT_PTR_NOT_NULL_FATAL(guac_client_alloc_buffer(client));
layer = guac_client_alloc_layer(client);
/* Index should be within pool size */
CU_ASSERT_PTR_NOT_NULL_FATAL(layer);
CU_ASSERT_FATAL(layer->index > 0);
CU_ASSERT_FATAL(layer->index <= GUAC_BUFFER_POOL_INITIAL_SIZE);
/* This should be a layer we have not seen yet */
CU_ASSERT_FALSE(seen[layer->index - 1]);
seen[layer->index - 1] = 1;
guac_client_free_layer(client, layer);
}
/* Now that pool is filled, we should get a previously seen layer */
layer = guac_client_alloc_layer(client);
CU_ASSERT_FATAL(layer->index > 0);
CU_ASSERT_FATAL(layer->index <= GUAC_BUFFER_POOL_INITIAL_SIZE);
CU_ASSERT_TRUE(seen[layer->index - 1]);
/* Free client */
guac_client_free(client);
}
/**
* Creates a new guac_client for the connection on the given socket, adding
* it to the client map based on its ID.
*/
static void guacd_handle_connection(guacd_client_map* map, guac_socket* socket) {
guac_client* client;
guac_client_plugin* plugin;
guac_instruction* select;
guac_instruction* size;
guac_instruction* audio;
guac_instruction* video;
guac_instruction* connect;
int init_result;
/* Reset guac_error */
guac_error = GUAC_STATUS_SUCCESS;
guac_error_message = NULL;
/* Get protocol from select instruction */
select = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "select");
if (select == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"select\"");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Validate args to select */
if (select->argc != 1) {
/* Log error */
guacd_log_error("Bad number of arguments to \"select\" (%i)",
select->argc);
/* Free resources */
guac_socket_free(socket);
return;
}
guacd_log_info("Protocol \"%s\" selected", select->argv[0]);
/* Get plugin from protocol in select */
plugin = guac_client_plugin_open(select->argv[0]);
guac_instruction_free(select);
if (plugin == NULL) {
/* Log error */
guacd_log_guac_error("Error loading client plugin");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Send args response */
if (guac_protocol_send_args(socket, plugin->args)
|| guac_socket_flush(socket)) {
/* Log error */
guacd_log_guac_error("Error sending \"args\"");
if (guac_client_plugin_close(plugin))
guacd_log_guac_error("Error closing client plugin");
guac_socket_free(socket);
return;
}
/* Get optimal screen size */
size = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "size");
if (size == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"size\"");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Get supported audio formats */
audio = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "audio");
if (audio == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"audio\"");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Get supported video formats */
video = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "video");
if (video == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"video\"");
/* Free resources */
guac_socket_free(socket);
return;
}
/* Get args from connect instruction */
connect = guac_instruction_expect(
socket, GUACD_USEC_TIMEOUT, "connect");
if (connect == NULL) {
/* Log error */
guacd_log_guac_error("Error reading \"connect\"");
if (guac_client_plugin_close(plugin))
guacd_log_guac_error("Error closing client plugin");
guac_socket_free(socket);
return;
}
/* Get client */
client = guac_client_alloc();
if (client == NULL) {
guacd_log_guac_error("Client could not be allocated");
guac_socket_free(socket);
return;
}
client->socket = socket;
client->log_info_handler = guacd_client_log_info;
client->log_error_handler = guacd_client_log_error;
/* Parse optimal screen dimensions from size instruction */
client->info.optimal_width = atoi(size->argv[0]);
client->info.optimal_height = atoi(size->argv[1]);
/* If DPI given, set the client resolution */
if (size->argc >= 3)
client->info.optimal_resolution = atoi(size->argv[2]);
/* Otherwise, use a safe default for rough backwards compatibility */
else
client->info.optimal_resolution = 96;
/* Store audio mimetypes */
client->info.audio_mimetypes = malloc(sizeof(char*) * (audio->argc+1));
memcpy(client->info.audio_mimetypes, audio->argv,
sizeof(char*) * audio->argc);
client->info.audio_mimetypes[audio->argc] = NULL;
/* Store video mimetypes */
client->info.video_mimetypes = malloc(sizeof(char*) * (video->argc+1));
memcpy(client->info.video_mimetypes, video->argv,
sizeof(char*) * video->argc);
client->info.video_mimetypes[video->argc] = NULL;
/* Store client */
if (guacd_client_map_add(map, client))
guacd_log_error("Unable to add client. Internal client storage has failed");
/* Send connection ID */
guacd_log_info("Connection ID is \"%s\"", client->connection_id);
guac_protocol_send_ready(socket, client->connection_id);
/* Init client */
init_result = guac_client_plugin_init_client(plugin,
client, connect->argc, connect->argv);
guac_instruction_free(connect);
/* If client could not be started, free everything and fail */
if (init_result) {
guac_client_free(client);
guacd_log_guac_error("Error instantiating client");
if (guac_client_plugin_close(plugin))
guacd_log_guac_error("Error closing client plugin");
guac_socket_free(socket);
return;
}
/* Start client threads */
guacd_log_info("Starting client");
if (guacd_client_start(client))
guacd_log_error("Client finished abnormally");
else
guacd_log_info("Client finished normally");
/* Remove client */
if (guacd_client_map_remove(map, client->connection_id) == NULL)
guacd_log_error("Unable to remove client. Internal client storage has failed");
/* Free mimetype lists */
free(client->info.audio_mimetypes);
free(client->info.video_mimetypes);
/* Free remaining instructions */
guac_instruction_free(audio);
guac_instruction_free(video);
guac_instruction_free(size);
/* Clean up */
guac_client_free(client);
if (guac_client_plugin_close(plugin))
guacd_log_error("Error closing client plugin");
/* Close socket */
guac_socket_free(socket);
}
guacd_proc* guacd_create_proc(const char* protocol) {
int sockets[2];
/* Open UNIX socket pair */
if (socketpair(AF_UNIX, SOCK_DGRAM, 0, sockets) < 0) {
guacd_log(GUAC_LOG_ERROR, "Error opening socket pair: %s", strerror(errno));
return NULL;
}
int parent_socket = sockets[0];
int child_socket = sockets[1];
/* Allocate process */
guacd_proc* proc = calloc(1, sizeof(guacd_proc));
if (proc == NULL) {
close(parent_socket);
close(child_socket);
return NULL;
}
/* Associate new client */
proc->client = guac_client_alloc();
if (proc->client == NULL) {
guacd_log_guac_error(GUAC_LOG_ERROR, "Unable to create client");
close(parent_socket);
close(child_socket);
free(proc);
return NULL;
}
/* Init logging */
proc->client->log_handler = guacd_client_log;
/* Fork */
proc->pid = fork();
if (proc->pid < 0) {
guacd_log(GUAC_LOG_ERROR, "Cannot fork child process: %s", strerror(errno));
close(parent_socket);
close(child_socket);
guac_client_free(proc->client);
free(proc);
return NULL;
}
/* Child */
else if (proc->pid == 0) {
/* Communicate with parent */
proc->fd_socket = parent_socket;
close(child_socket);
/* Start protocol-specific handling */
guacd_exec_proc(proc, protocol);
}
/* Parent */
else {
/* Communicate with child */
proc->fd_socket = child_socket;
close(parent_socket);
}
return proc;
}