e1a0ce5af9
* Add bind_ip property to WebSocketServer defaulting to "*" (listen to everyone) * Set default for GDscript Language Server to listen only to localhost Fixes potential security issue with GDScript language server being exposed to the broad net by default. Since it is the server which primary usage is to provide utility to the local editor there is no need to expose it.
313 lines
11 KiB
C++
313 lines
11 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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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 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 JAVASCRIPT_ENABLED
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#include "wsl_server.h"
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#include "core/os/os.h"
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#include "core/project_settings.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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Map<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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#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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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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if (protocol == "") // Invalid protocol(s) requested
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return false;
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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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return true;
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}
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Error WSLServer::PendingPeer::do_handshake(const Vector<String> p_protocols) {
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if (OS::get_singleton()->get_ticks_msec() - time > WSL_SERVER_TIMEOUT)
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return ERR_TIMEOUT;
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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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return FAILED;
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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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return FAILED;
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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, "Response headers 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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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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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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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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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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return OK;
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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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_server->listen(p_port, bind_ip);
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return OK;
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}
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void WSLServer::poll() {
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List<int> remove_ids;
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for (Map<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);
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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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_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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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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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 (Map<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), NULL);
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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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