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a8950f98dd
This commit is a huge refactor of the websocket module. The module is really old, and some design choices had to be re-evaluated. The WebSocketClient and WebSocketServer classes are now gone, and WebSocketPeer can act as either client or server. The WebSocketMultiplayerPeer class is no longer abstract, and implements the Multiplayer API on top of the lower level WebSocketPeer. WebSocketPeer is now a "raw" peer, like StreamPeerTCP and StreamPeerTLS, so it emits no signal, and just needs polling to update its internal state. To use it as a client, simply call WebSocketPeer.coonect_to_url, then frequently poll the peer until STATE_OPEN is reached and then you can write or read from it, or STATE_CLOSED and then you can check the disconnect code and reason). To implement a server instead, a TCPServer must be created, and the accepted connections needs to be provided to WebSocketPeer.accept_stream (which will perform the HTTP handshake). A full example of a WebSocketServer using TLS will be provided in the demo repository.
160 lines
6.1 KiB
C++
160 lines
6.1 KiB
C++
/*************************************************************************/
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/* wsl_peer.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef WSL_PEER_H
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#define WSL_PEER_H
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#ifndef WEB_ENABLED
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#include "websocket_peer.h"
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#include "packet_buffer.h"
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#include "core/crypto/crypto_core.h"
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#include "core/error/error_list.h"
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#include "core/io/packet_peer.h"
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#include "core/io/stream_peer_tcp.h"
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#include "core/templates/ring_buffer.h"
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#include "wslay/wslay.h"
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#define WSL_MAX_HEADER_SIZE 4096
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class WSLPeer : public WebSocketPeer {
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private:
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static CryptoCore::RandomGenerator *_static_rng;
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static WebSocketPeer *_create() { return memnew(WSLPeer); }
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// Callbacks.
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static ssize_t _wsl_recv_callback(wslay_event_context_ptr ctx, uint8_t *data, size_t len, int flags, void *user_data);
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static ssize_t _wsl_send_callback(wslay_event_context_ptr ctx, const uint8_t *data, size_t len, int flags, void *user_data);
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static int _wsl_genmask_callback(wslay_event_context_ptr ctx, uint8_t *buf, size_t len, void *user_data);
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static void _wsl_msg_recv_callback(wslay_event_context_ptr ctx, const struct wslay_event_on_msg_recv_arg *arg, void *user_data);
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static wslay_event_callbacks _wsl_callbacks;
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// Helpers
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static String _compute_key_response(String p_key);
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static String _generate_key();
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// Client IP resolver.
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class Resolver {
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Array ip_candidates;
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IP::ResolverID resolver_id = IP::RESOLVER_INVALID_ID;
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int port = 0;
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public:
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bool has_more_candidates() {
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return ip_candidates.size() > 0 || resolver_id != IP::RESOLVER_INVALID_ID;
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}
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void try_next_candidate(Ref<StreamPeerTCP> &p_tcp);
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void start(const String &p_host, int p_port);
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void stop();
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Resolver() {}
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};
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Resolver resolver;
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// WebSocket connection state.
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WebSocketPeer::State ready_state = WebSocketPeer::STATE_CLOSED;
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bool is_server = false;
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Ref<StreamPeerTCP> tcp;
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Ref<StreamPeer> connection;
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wslay_event_context_ptr wsl_ctx = nullptr;
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String requested_url;
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String requested_host;
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bool pending_request = true;
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Ref<StreamPeerBuffer> handshake_buffer;
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String selected_protocol;
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String session_key;
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int close_code = -1;
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String close_reason;
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uint8_t was_string = 0;
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// WebSocket configuration.
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bool use_tls = true;
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bool verify_tls = true;
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Ref<X509Certificate> tls_cert;
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// Packet buffers.
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Vector<uint8_t> packet_buffer;
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// Our packet info is just a boolean (is_string), using uint8_t for it.
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PacketBuffer<uint8_t> in_buffer;
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Error _send(const uint8_t *p_buffer, int p_buffer_size, wslay_opcode p_opcode);
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Error _do_server_handshake();
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bool _parse_client_request();
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void _do_client_handshake();
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bool _verify_server_response();
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void _clear();
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public:
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static void initialize();
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static void deinitialize();
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// PacketPeer
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virtual int get_available_packet_count() const override;
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virtual Error get_packet(const uint8_t **r_buffer, int &r_buffer_size) override;
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virtual Error put_packet(const uint8_t *p_buffer, int p_buffer_size) override;
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virtual int get_max_packet_size() const override { return packet_buffer.size(); };
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// WebSocketPeer
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virtual Error send(const uint8_t *p_buffer, int p_buffer_size, WriteMode p_mode) override;
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virtual Error connect_to_url(const String &p_url, bool p_verify_tls = true, Ref<X509Certificate> p_cert = Ref<X509Certificate>()) override;
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virtual Error accept_stream(Ref<StreamPeer> p_stream) override;
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virtual void close(int p_code = 1000, String p_reason = "") override;
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virtual void poll() override;
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virtual State get_ready_state() const override { return ready_state; }
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virtual int get_close_code() const override { return close_code; }
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virtual String get_close_reason() const override { return close_reason; }
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virtual int get_current_outbound_buffered_amount() const override;
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virtual IPAddress get_connected_host() const override;
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virtual uint16_t get_connected_port() const override;
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virtual String get_selected_protocol() const override;
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virtual String get_requested_url() const override;
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virtual bool was_string_packet() const override { return was_string; }
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virtual void set_no_delay(bool p_enabled) override;
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WSLPeer();
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~WSLPeer();
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};
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#endif // WEB_ENABLED
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#endif // WSL_PEER_H
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