From a8950f98dd9809f5da370185d086d7027e14b76a Mon Sep 17 00:00:00 2001 From: Fabio Alessandrelli Date: Sat, 24 Sep 2022 22:44:44 +0200 Subject: [WebSocket] Refactor websocket module. 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. --- modules/websocket/wsl_server.cpp | 329 --------------------------------------- 1 file changed, 329 deletions(-) delete mode 100644 modules/websocket/wsl_server.cpp (limited to 'modules/websocket/wsl_server.cpp') diff --git a/modules/websocket/wsl_server.cpp b/modules/websocket/wsl_server.cpp deleted file mode 100644 index 01dcd53839..0000000000 --- a/modules/websocket/wsl_server.cpp +++ /dev/null @@ -1,329 +0,0 @@ -/*************************************************************************/ -/* wsl_server.cpp */ -/*************************************************************************/ -/* 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 WEB_ENABLED - -#include "wsl_server.h" -#include "core/config/project_settings.h" -#include "core/os/os.h" - -bool WSLServer::PendingPeer::_parse_request(const Vector p_protocols, String &r_resource_name) { - Vector psa = String((char *)req_buf).split("\r\n"); - int len = psa.size(); - ERR_FAIL_COND_V_MSG(len < 4, false, "Not enough response headers, got: " + itos(len) + ", expected >= 4."); - - Vector req = psa[0].split(" ", false); - ERR_FAIL_COND_V_MSG(req.size() < 2, false, "Invalid protocol or status code."); - - // Wrong protocol - ERR_FAIL_COND_V_MSG(req[0] != "GET" || req[2] != "HTTP/1.1", false, "Invalid method or HTTP version."); - - r_resource_name = req[1]; - HashMap headers; - for (int i = 1; i < len; i++) { - Vector header = psa[i].split(":", false, 1); - ERR_FAIL_COND_V_MSG(header.size() != 2, false, "Invalid header -> " + psa[i]); - String name = header[0].to_lower(); - String value = header[1].strip_edges(); - if (headers.has(name)) { - headers[name] += "," + value; - } else { - headers[name] = value; - } - } -#define WSL_CHECK(NAME, VALUE) \ - ERR_FAIL_COND_V_MSG(!headers.has(NAME) || headers[NAME].to_lower() != VALUE, false, \ - "Missing or invalid header '" + String(NAME) + "'. Expected value '" + VALUE + "'."); -#define WSL_CHECK_EX(NAME) \ - ERR_FAIL_COND_V_MSG(!headers.has(NAME), false, "Missing header '" + String(NAME) + "'."); - WSL_CHECK("upgrade", "websocket"); - WSL_CHECK("sec-websocket-version", "13"); - WSL_CHECK_EX("sec-websocket-key"); - WSL_CHECK_EX("connection"); -#undef WSL_CHECK_EX -#undef WSL_CHECK - key = headers["sec-websocket-key"]; - if (headers.has("sec-websocket-protocol")) { - Vector protos = headers["sec-websocket-protocol"].split(","); - for (int i = 0; i < protos.size(); i++) { - String proto = protos[i].strip_edges(); - // Check if we have the given protocol - for (int j = 0; j < p_protocols.size(); j++) { - if (proto != p_protocols[j]) { - continue; - } - protocol = proto; - break; - } - // Found a protocol - if (!protocol.is_empty()) { - break; - } - } - if (protocol.is_empty()) { // Invalid protocol(s) requested - return false; - } - } else if (p_protocols.size() > 0) { // No protocol requested, but we need one - return false; - } - return true; -} - -Error WSLServer::PendingPeer::do_handshake(const Vector p_protocols, uint64_t p_timeout, String &r_resource_name, const Vector &p_extra_headers) { - if (OS::get_singleton()->get_ticks_msec() - time > p_timeout) { - print_verbose(vformat("WebSocket handshake timed out after %.3f seconds.", p_timeout * 0.001)); - return ERR_TIMEOUT; - } - - if (use_tls) { - Ref tls = static_cast>(connection); - if (tls.is_null()) { - ERR_FAIL_V_MSG(ERR_BUG, "Couldn't get StreamPeerTLS for WebSocket handshake."); - } - tls->poll(); - if (tls->get_status() == StreamPeerTLS::STATUS_HANDSHAKING) { - return ERR_BUSY; - } else if (tls->get_status() != StreamPeerTLS::STATUS_CONNECTED) { - print_verbose(vformat("WebSocket SSL connection error during handshake (StreamPeerTLS status code %d).", tls->get_status())); - return FAILED; - } - } - - if (!has_request) { - int read = 0; - while (true) { - ERR_FAIL_COND_V_MSG(req_pos >= WSL_MAX_HEADER_SIZE, ERR_OUT_OF_MEMORY, "WebSocket response headers are too big."); - Error err = connection->get_partial_data(&req_buf[req_pos], 1, read); - if (err != OK) { // Got an error - print_verbose(vformat("WebSocket error while getting partial data (StreamPeer error code %d).", err)); - return FAILED; - } else if (read != 1) { // Busy, wait next poll - return ERR_BUSY; - } - char *r = (char *)req_buf; - int l = req_pos; - if (l > 3 && r[l] == '\n' && r[l - 1] == '\r' && r[l - 2] == '\n' && r[l - 3] == '\r') { - r[l - 3] = '\0'; - if (!_parse_request(p_protocols, r_resource_name)) { - return FAILED; - } - String s = "HTTP/1.1 101 Switching Protocols\r\n"; - s += "Upgrade: websocket\r\n"; - s += "Connection: Upgrade\r\n"; - s += "Sec-WebSocket-Accept: " + WSLPeer::compute_key_response(key) + "\r\n"; - if (!protocol.is_empty()) { - s += "Sec-WebSocket-Protocol: " + protocol + "\r\n"; - } - for (int i = 0; i < p_extra_headers.size(); i++) { - s += p_extra_headers[i] + "\r\n"; - } - s += "\r\n"; - response = s.utf8(); - has_request = true; - break; - } - req_pos += 1; - } - } - - if (has_request && response_sent < response.size() - 1) { - int sent = 0; - Error err = connection->put_partial_data((const uint8_t *)response.get_data() + response_sent, response.size() - response_sent - 1, sent); - if (err != OK) { - print_verbose(vformat("WebSocket error while putting partial data (StreamPeer error code %d).", err)); - return err; - } - response_sent += sent; - } - - if (response_sent < response.size() - 1) { - return ERR_BUSY; - } - - return OK; -} - -void WSLServer::set_extra_headers(const Vector &p_headers) { - _extra_headers = p_headers; -} - -Error WSLServer::listen(int p_port, const Vector p_protocols, bool gd_mp_api) { - ERR_FAIL_COND_V(is_listening(), ERR_ALREADY_IN_USE); - - _is_multiplayer = gd_mp_api; - // Strip edges from protocols. - _protocols.resize(p_protocols.size()); - String *pw = _protocols.ptrw(); - for (int i = 0; i < p_protocols.size(); i++) { - pw[i] = p_protocols[i].strip_edges(); - } - return _server->listen(p_port, bind_ip); -} - -void WSLServer::poll() { - List remove_ids; - for (const KeyValue> &E : _peer_map) { - Ref peer = const_cast(static_cast(E.value.ptr())); - peer->poll(); - if (!peer->is_connected_to_host()) { - _on_disconnect(E.key, peer->close_code != -1); - remove_ids.push_back(E.key); - } - } - for (int &E : remove_ids) { - _peer_map.erase(E); - } - remove_ids.clear(); - - List> remove_peers; - for (const Ref &E : _pending) { - String resource_name; - Ref ppeer = E; - Error err = ppeer->do_handshake(_protocols, handshake_timeout, resource_name, _extra_headers); - if (err == ERR_BUSY) { - continue; - } else if (err != OK) { - remove_peers.push_back(ppeer); - continue; - } - // Creating new peer - int32_t id = generate_unique_id(); - - WSLPeer::PeerData *data = memnew(struct WSLPeer::PeerData); - data->obj = this; - data->conn = ppeer->connection; - data->tcp = ppeer->tcp; - data->is_server = true; - data->id = id; - - Ref ws_peer = memnew(WSLPeer); - ws_peer->make_context(data, _in_buf_size, _in_pkt_size, _out_buf_size, _out_pkt_size); - ws_peer->set_no_delay(true); - - _peer_map[id] = ws_peer; - remove_peers.push_back(ppeer); - _on_connect(id, ppeer->protocol, resource_name); - } - for (const Ref &E : remove_peers) { - _pending.erase(E); - } - remove_peers.clear(); - - if (!_server->is_listening()) { - return; - } - - while (_server->is_connection_available()) { - Ref conn = _server->take_connection(); - if (is_refusing_new_connections()) { - continue; // Conn will go out-of-scope and be closed. - } - - Ref peer = memnew(PendingPeer); - if (private_key.is_valid() && tls_cert.is_valid()) { - Ref tls = Ref(StreamPeerTLS::create()); - tls->set_blocking_handshake_enabled(false); - tls->accept_stream(conn, private_key, tls_cert, ca_chain); - peer->connection = tls; - peer->use_tls = true; - } else { - peer->connection = conn; - } - peer->tcp = conn; - peer->time = OS::get_singleton()->get_ticks_msec(); - _pending.push_back(peer); - } -} - -bool WSLServer::is_listening() const { - return _server->is_listening(); -} - -int WSLServer::get_max_packet_size() const { - return (1 << _out_buf_size) - PROTO_SIZE; -} - -void WSLServer::stop() { - _server->stop(); - for (const KeyValue> &E : _peer_map) { - Ref peer = const_cast(static_cast(E.value.ptr())); - peer->close_now(); - } - _pending.clear(); - _peer_map.clear(); - _protocols.clear(); -} - -bool WSLServer::has_peer(int p_id) const { - return _peer_map.has(p_id); -} - -Ref WSLServer::get_peer(int p_id) const { - ERR_FAIL_COND_V(!has_peer(p_id), nullptr); - return _peer_map[p_id]; -} - -IPAddress WSLServer::get_peer_address(int p_peer_id) const { - ERR_FAIL_COND_V(!has_peer(p_peer_id), IPAddress()); - - return _peer_map[p_peer_id]->get_connected_host(); -} - -int WSLServer::get_peer_port(int p_peer_id) const { - ERR_FAIL_COND_V(!has_peer(p_peer_id), 0); - - return _peer_map[p_peer_id]->get_connected_port(); -} - -void WSLServer::disconnect_peer(int p_peer_id, int p_code, String p_reason) { - ERR_FAIL_COND(!has_peer(p_peer_id)); - - get_peer(p_peer_id)->close(p_code, p_reason); -} - -Error WSLServer::set_buffers(int p_in_buffer, int p_in_packets, int p_out_buffer, int p_out_packets) { - ERR_FAIL_COND_V_MSG(_server->is_listening(), FAILED, "Buffers sizes can only be set before listening or connecting."); - - _in_buf_size = nearest_shift(p_in_buffer - 1) + 10; - _in_pkt_size = nearest_shift(p_in_packets - 1); - _out_buf_size = nearest_shift(p_out_buffer - 1) + 10; - _out_pkt_size = nearest_shift(p_out_packets - 1); - return OK; -} - -WSLServer::WSLServer() { - _server.instantiate(); -} - -WSLServer::~WSLServer() { - stop(); -} - -#endif // WEB_ENABLED -- cgit v1.2.3