mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-21 11:26:53 +01:00
342 lines
12 KiB
C++
342 lines
12 KiB
C++
/*************************************************************************/
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/* wsl_server.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* PANDEMONIUM ENGINE */
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/* https://github.com/Relintai/pandemonium_engine */
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/*************************************************************************/
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/* Copyright (c) 2022-present Péter Magyar. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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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 JAVASCRIPT_ENABLED
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#include "wsl_server.h"
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#include "core/config/project_settings.h"
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#include "core/os/os.h"
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WSLServer::PendingPeer::PendingPeer() {
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use_ssl = false;
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time = 0;
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has_request = false;
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response_sent = 0;
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req_pos = 0;
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memset(req_buf, 0, sizeof(req_buf));
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}
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bool WSLServer::PendingPeer::_parse_request(const Vector<String> p_protocols) {
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Vector<String> psa = String((char *)req_buf).split("\r\n");
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int len = psa.size();
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ERR_FAIL_COND_V_MSG(len < 4, false, "Not enough response headers, got: " + itos(len) + ", expected >= 4.");
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Vector<String> req = psa[0].split(" ", false);
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ERR_FAIL_COND_V_MSG(req.size() < 2, false, "Invalid protocol or status code.");
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// Wrong protocol
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ERR_FAIL_COND_V_MSG(req[0] != "GET" || req[2] != "HTTP/1.1", false, "Invalid method or HTTP version.");
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RBMap<String, String> headers;
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for (int i = 1; i < len; i++) {
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Vector<String> header = psa[i].split(":", false, 1);
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ERR_FAIL_COND_V_MSG(header.size() != 2, false, "Invalid header -> " + psa[i]);
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String name = header[0].to_lower();
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String value = header[1].strip_edges();
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if (headers.has(name)) {
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headers[name] += "," + value;
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} else {
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headers[name] = value;
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}
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}
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#define _WSL_CHECK(NAME, VALUE) \
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ERR_FAIL_COND_V_MSG(!headers.has(NAME) || headers[NAME].to_lower() != VALUE, false, \
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"Missing or invalid header '" + String(NAME) + "'. Expected value '" + VALUE + "'.");
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#define _WSL_CHECK_EX(NAME) \
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ERR_FAIL_COND_V_MSG(!headers.has(NAME), false, "Missing header '" + String(NAME) + "'.");
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_WSL_CHECK("upgrade", "websocket");
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_WSL_CHECK("sec-websocket-version", "13");
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_WSL_CHECK_EX("sec-websocket-key");
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_WSL_CHECK_EX("connection");
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#undef _WSL_CHECK_EX
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#undef _WSL_CHECK
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key = headers["sec-websocket-key"];
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if (headers.has("sec-websocket-protocol")) {
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Vector<String> protos = headers["sec-websocket-protocol"].split(",");
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for (int i = 0; i < protos.size(); i++) {
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String proto = protos[i].strip_edges();
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// Check if we have the given protocol
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for (int j = 0; j < p_protocols.size(); j++) {
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if (proto != p_protocols[j]) {
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continue;
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}
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protocol = proto;
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break;
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}
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// Found a protocol
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if (protocol != "") {
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break;
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}
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}
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if (protocol == "") { // Invalid protocol(s) requested
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return false;
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}
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} else if (p_protocols.size() > 0) { // No protocol requested, but we need one
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return false;
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}
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return true;
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}
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Error WSLServer::PendingPeer::do_handshake(const Vector<String> p_protocols, uint64_t p_timeout, const Vector<String> &p_extra_headers) {
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if (OS::get_singleton()->get_ticks_msec() - time > p_timeout) {
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print_verbose(vformat("WebSocket handshake timed out after %.3f seconds.", p_timeout * 0.001));
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return ERR_TIMEOUT;
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}
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if (use_ssl) {
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Ref<StreamPeerSSL> ssl = static_cast<Ref<StreamPeerSSL>>(connection);
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if (ssl.is_null()) {
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ERR_FAIL_V_MSG(ERR_BUG, "Couldn't get StreamPeerSSL for WebSocket handshake.");
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}
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ssl->poll();
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if (ssl->get_status() == StreamPeerSSL::STATUS_HANDSHAKING) {
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return ERR_BUSY;
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} else if (ssl->get_status() != StreamPeerSSL::STATUS_CONNECTED) {
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print_verbose(vformat("WebSocket SSL connection error during handshake (StreamPeerSSL status code %d).", ssl->get_status()));
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return FAILED;
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}
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}
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if (!has_request) {
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int read = 0;
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while (true) {
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ERR_FAIL_COND_V_MSG(req_pos >= WSL_MAX_HEADER_SIZE, ERR_OUT_OF_MEMORY, "WebSocket response headers are too big.");
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Error err = connection->get_partial_data(&req_buf[req_pos], 1, read);
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if (err != OK) { // Got an error
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print_verbose(vformat("WebSocket error while getting partial data (StreamPeer error code %d).", err));
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return FAILED;
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} else if (read != 1) { // Busy, wait next poll
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return ERR_BUSY;
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}
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char *r = (char *)req_buf;
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int l = req_pos;
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if (l > 3 && r[l] == '\n' && r[l - 1] == '\r' && r[l - 2] == '\n' && r[l - 3] == '\r') {
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r[l - 3] = '\0';
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if (!_parse_request(p_protocols)) {
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return FAILED;
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}
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String s = "HTTP/1.1 101 Switching Protocols\r\n";
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s += "Upgrade: websocket\r\n";
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s += "Connection: Upgrade\r\n";
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s += "Sec-WebSocket-Accept: " + WSLPeer::compute_key_response(key) + "\r\n";
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if (protocol != "") {
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s += "Sec-WebSocket-Protocol: " + protocol + "\r\n";
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}
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for (int i = 0; i < p_extra_headers.size(); i++) {
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s += p_extra_headers[i] + "\r\n";
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}
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s += "\r\n";
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response = s.utf8();
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has_request = true;
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break;
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}
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req_pos += 1;
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}
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}
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if (has_request && response_sent < response.size() - 1) {
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int sent = 0;
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Error err = connection->put_partial_data((const uint8_t *)response.get_data() + response_sent, response.size() - response_sent - 1, sent);
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if (err != OK) {
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print_verbose(vformat("WebSocket error while putting partial data (StreamPeer error code %d).", err));
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return err;
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}
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response_sent += sent;
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}
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if (response_sent < response.size() - 1) {
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return ERR_BUSY;
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}
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return OK;
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}
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void WSLServer::set_extra_headers(const Vector<String> &p_headers) {
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_extra_headers = p_headers;
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}
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Error WSLServer::listen(int p_port, const Vector<String> p_protocols, bool gd_mp_api) {
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ERR_FAIL_COND_V(is_listening(), ERR_ALREADY_IN_USE);
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_is_multiplayer = gd_mp_api;
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// Strip edges from protocols.
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_protocols.resize(p_protocols.size());
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String *pw = _protocols.ptrw();
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for (int i = 0; i < p_protocols.size(); i++) {
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pw[i] = p_protocols[i].strip_edges();
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}
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return _server->listen(p_port, bind_ip);
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}
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void WSLServer::poll() {
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List<int> remove_ids;
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for (RBMap<int, Ref<WebSocketPeer>>::Element *E = _peer_map.front(); E; E = E->next()) {
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Ref<WSLPeer> peer = (WSLPeer *)E->get().ptr();
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peer->poll();
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if (!peer->is_connected_to_host()) {
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_on_disconnect(E->key(), peer->close_code != -1);
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remove_ids.push_back(E->key());
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}
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}
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for (List<int>::Element *E = remove_ids.front(); E; E = E->next()) {
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_peer_map.erase(E->get());
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}
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remove_ids.clear();
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List<Ref<PendingPeer>> remove_peers;
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for (List<Ref<PendingPeer>>::Element *E = _pending.front(); E; E = E->next()) {
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Ref<PendingPeer> ppeer = E->get();
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Error err = ppeer->do_handshake(_protocols, handshake_timeout, _extra_headers);
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if (err == ERR_BUSY) {
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continue;
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} else if (err != OK) {
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remove_peers.push_back(ppeer);
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continue;
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}
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// Creating new peer
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int32_t id = _gen_unique_id();
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WSLPeer::PeerData *data = memnew(struct WSLPeer::PeerData);
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data->obj = this;
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data->conn = ppeer->connection;
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data->tcp = ppeer->tcp;
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data->is_server = true;
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data->id = id;
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Ref<WSLPeer> ws_peer = memnew(WSLPeer);
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ws_peer->make_context(data, _in_buf_size, _in_pkt_size, _out_buf_size, _out_pkt_size);
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ws_peer->set_no_delay(true);
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_peer_map[id] = ws_peer;
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remove_peers.push_back(ppeer);
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_on_connect(id, ppeer->protocol);
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}
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for (List<Ref<PendingPeer>>::Element *E = remove_peers.front(); E; E = E->next()) {
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_pending.erase(E->get());
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}
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remove_peers.clear();
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if (!_server->is_listening()) {
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return;
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}
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while (_server->is_connection_available()) {
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Ref<StreamPeerTCP> conn = _server->take_connection();
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if (is_refusing_new_connections()) {
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continue; // Conn will go out-of-scope and be closed.
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}
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Ref<PendingPeer> peer = memnew(PendingPeer);
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if (private_key.is_valid() && ssl_cert.is_valid()) {
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Ref<StreamPeerSSL> ssl = Ref<StreamPeerSSL>(StreamPeerSSL::create());
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ssl->set_blocking_handshake_enabled(false);
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ssl->accept_stream(conn, private_key, ssl_cert, ca_chain);
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peer->connection = ssl;
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peer->use_ssl = true;
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} else {
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peer->connection = conn;
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}
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peer->tcp = conn;
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peer->time = OS::get_singleton()->get_ticks_msec();
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_pending.push_back(peer);
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}
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}
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bool WSLServer::is_listening() const {
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return _server->is_listening();
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}
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int WSLServer::get_max_packet_size() const {
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return (1 << _out_buf_size) - PROTO_SIZE;
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}
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void WSLServer::stop() {
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_server->stop();
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for (RBMap<int, Ref<WebSocketPeer>>::Element *E = _peer_map.front(); E; E = E->next()) {
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Ref<WSLPeer> peer = (WSLPeer *)E->get().ptr();
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peer->close_now();
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}
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_pending.clear();
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_peer_map.clear();
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_protocols.clear();
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}
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bool WSLServer::has_peer(int p_id) const {
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return _peer_map.has(p_id);
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}
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Ref<WebSocketPeer> WSLServer::get_peer(int p_id) const {
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ERR_FAIL_COND_V(!has_peer(p_id), nullptr);
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return _peer_map[p_id];
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}
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IP_Address WSLServer::get_peer_address(int p_peer_id) const {
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ERR_FAIL_COND_V(!has_peer(p_peer_id), IP_Address());
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return _peer_map[p_peer_id]->get_connected_host();
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}
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int WSLServer::get_peer_port(int p_peer_id) const {
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ERR_FAIL_COND_V(!has_peer(p_peer_id), 0);
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return _peer_map[p_peer_id]->get_connected_port();
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}
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void WSLServer::disconnect_peer(int p_peer_id, int p_code, String p_reason) {
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ERR_FAIL_COND(!has_peer(p_peer_id));
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get_peer(p_peer_id)->close(p_code, p_reason);
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}
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Error WSLServer::set_buffers(int p_in_buffer, int p_in_packets, int p_out_buffer, int p_out_packets) {
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ERR_FAIL_COND_V_MSG(_server->is_listening(), FAILED, "Buffers sizes can only be set before listening or connecting.");
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_in_buf_size = nearest_shift(p_in_buffer - 1) + 10;
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_in_pkt_size = nearest_shift(p_in_packets - 1);
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_out_buf_size = nearest_shift(p_out_buffer - 1) + 10;
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_out_pkt_size = nearest_shift(p_out_packets - 1);
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return OK;
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}
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WSLServer::WSLServer() {
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_in_buf_size = nearest_shift((int)GLOBAL_GET(WSS_IN_BUF) - 1) + 10;
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_in_pkt_size = nearest_shift((int)GLOBAL_GET(WSS_IN_PKT) - 1);
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_out_buf_size = nearest_shift((int)GLOBAL_GET(WSS_OUT_BUF) - 1) + 10;
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_out_pkt_size = nearest_shift((int)GLOBAL_GET(WSS_OUT_PKT) - 1);
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_server.instance();
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}
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WSLServer::~WSLServer() {
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stop();
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}
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#endif // JAVASCRIPT_ENABLED
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