/*************************************************************************/ /* wsl_server.cpp */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */ /* Copyright (c) 2014-2021 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 JAVASCRIPT_ENABLED #include "wsl_server.h" #include "core/config/project_settings.h" #include "core/os/os.h" bool WSLServer::PendingPeer::_parse_request(const Vector<String> p_protocols, String &r_resource_name) { Vector<String> 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<String> 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]; Map<String, String> headers; for (int i = 1; i < len; i++) { Vector<String> 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<String> 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 != "") { break; } } if (protocol == "") { // 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<String> p_protocols, uint64_t p_timeout, String &r_resource_name) { 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_ssl) { Ref<StreamPeerSSL> ssl = static_cast<Ref<StreamPeerSSL>>(connection); if (ssl.is_null()) { ERR_FAIL_V_MSG(ERR_BUG, "Couldn't get StreamPeerSSL for WebSocket handshake."); } ssl->poll(); if (ssl->get_status() == StreamPeerSSL::STATUS_HANDSHAKING) { return ERR_BUSY; } else if (ssl->get_status() != StreamPeerSSL::STATUS_CONNECTED) { print_verbose(vformat("WebSocket SSL connection error during handshake (StreamPeerSSL status code %d).", ssl->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 != "") { s += "Sec-WebSocket-Protocol: " + protocol + "\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; } Error WSLServer::listen(int p_port, const Vector<String> 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<int> remove_ids; for (Map<int, Ref<WebSocketPeer>>::Element *E = _peer_map.front(); E; E = E->next()) { Ref<WSLPeer> peer = (WSLPeer *)E->get().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<Ref<PendingPeer>> remove_peers; for (const Ref<PendingPeer> &E : _pending) { String resource_name; Ref<PendingPeer> ppeer = E; Error err = ppeer->do_handshake(_protocols, handshake_timeout, resource_name); 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<WSLPeer> 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<PendingPeer> &E : remove_peers) { _pending.erase(E); } remove_peers.clear(); if (!_server->is_listening()) { return; } while (_server->is_connection_available()) { Ref<StreamPeerTCP> conn = _server->take_connection(); if (is_refusing_new_connections()) { continue; // Conn will go out-of-scope and be closed. } Ref<PendingPeer> peer = memnew(PendingPeer); if (private_key.is_valid() && ssl_cert.is_valid()) { Ref<StreamPeerSSL> ssl = Ref<StreamPeerSSL>(StreamPeerSSL::create()); ssl->set_blocking_handshake_enabled(false); ssl->accept_stream(conn, private_key, ssl_cert, ca_chain); peer->connection = ssl; peer->use_ssl = 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 (Map<int, Ref<WebSocketPeer>>::Element *E = _peer_map.front(); E; E = E->next()) { Ref<WSLPeer> peer = (WSLPeer *)E->get().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<WebSocketPeer> 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 // JAVASCRIPT_ENABLED