GUACAMOLE-623: Stub out implementation of WebSocket client for Kubernetes.
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@ -24,6 +24,7 @@
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#include <guacamole/client.h>
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#include <guacamole/protocol.h>
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#include <libwebsockets.h>
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#include <errno.h>
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#include <netdb.h>
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@ -36,6 +37,104 @@
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#include <sys/time.h>
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#include <unistd.h>
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/**
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* The name of the WebSocket protocol specific to Kubernetes which should be
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* sent to the Kubernetes server when attaching to a pod.
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*/
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#define GUAC_KUBERNETES_LWS_PROTOCOL "v4.channel.k8s.io"
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/**
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* Callback invoked by libwebsockets for events related to a WebSocket being
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* used for communicating with an attached Kubernetes pod.
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*
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* @param wsi
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* The libwebsockets handle for the WebSocket connection.
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*
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* @param reason
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* The reason (event) that this callback was invoked.
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*
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* @param user
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* Arbitrary data assocated with the WebSocket session. This will always
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* be a pointer to the guac_client instance.
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*
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* @param in
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* A pointer to arbitrary, reason-specific data.
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*
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* @param length
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* An arbitrary, reason-specific length value.
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*
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* @return
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* An undocumented integer value related the success of handling the
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* event, or -1 if the WebSocket connection should be closed.
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*/
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static int guac_kubernetes_lws_callback(struct lws* wsi,
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enum lws_callback_reasons reason, void* user,
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void* in, size_t length) {
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guac_client* client = (guac_client*) user;
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/*guac_kubernetes_client* kubernetes_client =
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(guac_kubernetes_client*) client->data;*/
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/* Request connection closure if client is stopped */
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if (client->state != GUAC_CLIENT_RUNNING)
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return -1;
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switch (reason) {
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case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
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guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_NOT_FOUND,
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"Error connecting to Kubernetes server: %s",
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in != NULL ? (char*) in : "(no error description "
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"available)");
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break;
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/* Logged in */
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case LWS_CALLBACK_CLIENT_ESTABLISHED:
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guac_client_log(client, GUAC_LOG_INFO,
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"Kubernetes connection successful.");
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break;
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case LWS_CALLBACK_CLIENT_RECEIVE:
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guac_client_log(client, GUAC_LOG_DEBUG, "Received: %s",
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(const char*) in);
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break;
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/* TODO: Only send data here. Request callback for writing via lws_callback_on_writable(some struct lws*) */
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case LWS_CALLBACK_CLIENT_WRITEABLE:
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break;
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case LWS_CALLBACK_CLOSED:
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/* TODO: case LWS_CALLBACK_CLIENT_CLOSED: <-- Needs test and #ifdef */
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guac_client_stop(client);
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guac_client_log(client, GUAC_LOG_DEBUG, "WebSocket connection to "
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"Kubernetes server closed.");
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break;
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/* No other event types are applicable */
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default:
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guac_client_log(client, GUAC_LOG_DEBUG, "Unexpected libwebsockets "
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"reason: %i", reason);
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break;
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}
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return lws_callback_http_dummy(wsi, reason, user, in, length);
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}
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/**
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* List of all WebSocket protocols which should be declared as supported by
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* libwebsockets during the initial WebSocket handshake, along with
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* corresponding event-handling callbacks.
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*/
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struct lws_protocols guac_kubernetes_lws_protocols[] = {
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{
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.name = GUAC_KUBERNETES_LWS_PROTOCOL,
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.callback = guac_kubernetes_lws_callback
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},
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{ 0 }
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};
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/**
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* Input thread, started by the main Kubernetes client thread. This thread
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* continuously reads from the terminal's STDIN and transfers all read
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@ -111,11 +210,69 @@ void* guac_kubernetes_client_thread(void* data) {
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settings->create_typescript_path);
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}
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/* TODO: Open WebSocket connection to Kubernetes */
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/* Init libwebsockets context creation parameters */
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struct lws_context_creation_info context_info = {
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.port = CONTEXT_PORT_NO_LISTEN, /* We are not a WebSocket server */
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.protocols = guac_kubernetes_lws_protocols
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};
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/* Logged in */
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guac_client_log(client, GUAC_LOG_INFO,
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"Kubernetes connection successful.");
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/* Init WebSocket connection parameters which do not vary by Guacmaole
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* connection parameters or creation of future libwebsockets objects */
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struct lws_client_connect_info connection_info = {
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.host = settings->hostname,
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.address = settings->hostname,
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.origin = settings->hostname,
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.port = settings->port,
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.protocol = GUAC_KUBERNETES_LWS_PROTOCOL,
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.pwsi = &kubernetes_client->wsi,
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.userdata = client
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};
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/* If requested, use an SSL/TLS connection for communication with
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* Kubernetes */
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if (settings->use_ssl) {
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/* Enable use of SSL/TLS */
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context_info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
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connection_info.ssl_connection = LCCSCF_USE_SSL;
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/* Bypass certificate checks if requested */
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if (settings->ignore_cert) {
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connection_info.ssl_connection |=
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LCCSCF_ALLOW_SELFSIGNED
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| LCCSCF_SKIP_SERVER_CERT_HOSTNAME_CHECK
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| LCCSCF_ALLOW_EXPIRED;
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}
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/* Otherwise use the given CA certificate to validate (if any) */
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else
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context_info.client_ssl_ca_filepath = settings->ca_cert_file;
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/* Certificate and key file for SSL/TLS client auth */
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context_info.client_ssl_cert_filepath = settings->client_cert_file;
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context_info.client_ssl_private_key_filepath = settings->client_key_file;
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}
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/* Create libwebsockets context */
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struct lws_context* context = lws_create_context(&context_info);
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if (!context) {
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guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR,
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"Initialization of libwebsockets failed");
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return NULL;
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}
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/* FIXME: Generate path dynamically */
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connection_info.context = context;
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connection_info.path = "/api/v1/namespaces/default/pods/my-shell-68974bb7f7-rpjgr/attach?container=my-shell&stdin=true&stdout=true&tty=true";
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/* Open WebSocket connection to Kubernetes */
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kubernetes_client->wsi = lws_client_connect_via_info(&connection_info);
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if (kubernetes_client->wsi == NULL) {
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guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR,
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"Connection via libwebsockets failed");
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return NULL;
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}
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/* Start input thread */
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if (pthread_create(&(input_thread), NULL, guac_kubernetes_input_thread, (void*) client)) {
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@ -123,12 +280,22 @@ void* guac_kubernetes_client_thread(void* data) {
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return NULL;
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}
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/* TODO: While data available, write to terminal */
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/* As long as client is connected, continue polling libwebsockets */
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while (client->state == GUAC_CLIENT_RUNNING) {
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/* Cease polling libwebsockets if an error condition is signalled */
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if (lws_service(context, 1000) < 0)
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break;
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}
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/* Kill client and Wait for input thread to die */
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guac_client_stop(client);
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pthread_join(input_thread, NULL);
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/* All done with libwebsockets */
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lws_context_destroy(context);
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guac_client_log(client, GUAC_LOG_INFO, "Kubernetes connection ended.");
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return NULL;
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@ -26,6 +26,7 @@
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#include "settings.h"
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#include "terminal/terminal.h"
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#include <libwebsockets.h>
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#include <stdint.h>
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/**
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@ -38,6 +39,11 @@ typedef struct guac_kubernetes_client {
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*/
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guac_kubernetes_settings* settings;
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/**
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* The connected WebSocket.
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*/
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struct lws* wsi;
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/**
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* The Kubernetes client thread.
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*/
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