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/*************************************************************************/
/* wsl_peer.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef WSL_PEER_H
#define WSL_PEER_H
#ifndef WEB_ENABLED
#include "websocket_peer.h"
#include "packet_buffer.h"
#include "core/crypto/crypto_core.h"
#include "core/error/error_list.h"
#include "core/io/packet_peer.h"
#include "core/io/stream_peer_tcp.h"
#include "core/templates/ring_buffer.h"
#include "wslay/wslay.h"
#define WSL_MAX_HEADER_SIZE 4096
class WSLPeer : public WebSocketPeer {
private:
static CryptoCore::RandomGenerator *_static_rng;
static WebSocketPeer *_create() { return memnew(WSLPeer); }
// Callbacks.
static ssize_t _wsl_recv_callback(wslay_event_context_ptr ctx, uint8_t *data, size_t len, int flags, void *user_data);
static ssize_t _wsl_send_callback(wslay_event_context_ptr ctx, const uint8_t *data, size_t len, int flags, void *user_data);
static int _wsl_genmask_callback(wslay_event_context_ptr ctx, uint8_t *buf, size_t len, void *user_data);
static void _wsl_msg_recv_callback(wslay_event_context_ptr ctx, const struct wslay_event_on_msg_recv_arg *arg, void *user_data);
static wslay_event_callbacks _wsl_callbacks;
// Helpers
static String _compute_key_response(String p_key);
static String _generate_key();
// Client IP resolver.
class Resolver {
Array ip_candidates;
IP::ResolverID resolver_id = IP::RESOLVER_INVALID_ID;
int port = 0;
public:
bool has_more_candidates() {
return ip_candidates.size() > 0 || resolver_id != IP::RESOLVER_INVALID_ID;
}
void try_next_candidate(Ref<StreamPeerTCP> &p_tcp);
void start(const String &p_host, int p_port);
void stop();
Resolver() {}
};
Resolver resolver;
// WebSocket connection state.
WebSocketPeer::State ready_state = WebSocketPeer::STATE_CLOSED;
bool is_server = false;
Ref<StreamPeerTCP> tcp;
Ref<StreamPeer> connection;
wslay_event_context_ptr wsl_ctx = nullptr;
String requested_url;
String requested_host;
bool pending_request = true;
Ref<StreamPeerBuffer> handshake_buffer;
String selected_protocol;
String session_key;
int close_code = -1;
String close_reason;
uint8_t was_string = 0;
// WebSocket configuration.
bool use_tls = true;
bool verify_tls = true;
Ref<X509Certificate> tls_cert;
// Packet buffers.
Vector<uint8_t> packet_buffer;
// Our packet info is just a boolean (is_string), using uint8_t for it.
PacketBuffer<uint8_t> in_buffer;
Error _send(const uint8_t *p_buffer, int p_buffer_size, wslay_opcode p_opcode);
Error _do_server_handshake();
bool _parse_client_request();
void _do_client_handshake();
bool _verify_server_response();
void _clear();
public:
static void initialize();
static void deinitialize();
// PacketPeer
virtual int get_available_packet_count() const override;
virtual Error get_packet(const uint8_t **r_buffer, int &r_buffer_size) override;
virtual Error put_packet(const uint8_t *p_buffer, int p_buffer_size) override;
virtual int get_max_packet_size() const override { return packet_buffer.size(); };
// WebSocketPeer
virtual Error send(const uint8_t *p_buffer, int p_buffer_size, WriteMode p_mode) override;
virtual Error connect_to_url(const String &p_url, bool p_verify_tls = true, Ref<X509Certificate> p_cert = Ref<X509Certificate>()) override;
virtual Error accept_stream(Ref<StreamPeer> p_stream) override;
virtual void close(int p_code = 1000, String p_reason = "") override;
virtual void poll() override;
virtual State get_ready_state() const override { return ready_state; }
virtual int get_close_code() const override { return close_code; }
virtual String get_close_reason() const override { return close_reason; }
virtual int get_current_outbound_buffered_amount() const override;
virtual IPAddress get_connected_host() const override;
virtual uint16_t get_connected_port() const override;
virtual String get_selected_protocol() const override;
virtual String get_requested_url() const override;
virtual bool was_string_packet() const override { return was_string; }
virtual void set_no_delay(bool p_enabled) override;
WSLPeer();
~WSLPeer();
};
#endif // WEB_ENABLED
#endif // WSL_PEER_H
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