369 lines
11 KiB
C++
369 lines
11 KiB
C++
/*************************************************************************/
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/* wsl_client.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) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 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_client.h"
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#include "core/config/project_settings.h"
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#include "core/io/ip.h"
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void WSLClient::_do_handshake() {
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if (_requested < _request.size() - 1) {
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int sent = 0;
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Error err = _connection->put_partial_data(((const uint8_t *)_request.get_data() + _requested), _request.size() - _requested - 1, sent);
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// Sending handshake failed
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if (err != OK) {
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disconnect_from_host();
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_on_error();
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return;
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}
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_requested += sent;
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} else {
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int read = 0;
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while (true) {
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if (_resp_pos >= WSL_MAX_HEADER_SIZE) {
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// Header is too big
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disconnect_from_host();
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_on_error();
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ERR_FAIL_MSG("Response headers too big.");
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}
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Error err = _connection->get_partial_data(&_resp_buf[_resp_pos], 1, read);
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if (err == ERR_FILE_EOF) {
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// We got a disconnect.
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disconnect_from_host();
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_on_error();
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return;
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} else if (err != OK) {
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// Got some error.
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disconnect_from_host();
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_on_error();
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return;
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} else if (read != 1) {
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// Busy, wait next poll.
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break;
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}
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// Check "\r\n\r\n" header terminator
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char *r = (char *)_resp_buf;
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int l = _resp_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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String protocol;
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// Response is over, verify headers and create peer.
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if (!_verify_headers(protocol)) {
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disconnect_from_host();
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_on_error();
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ERR_FAIL_MSG("Invalid response headers.");
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}
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// Create peer.
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WSLPeer::PeerData *data = memnew(struct WSLPeer::PeerData);
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data->obj = this;
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data->conn = _connection;
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data->tcp = _tcp;
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data->is_server = false;
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data->id = 1;
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_peer->make_context(data, _in_buf_size, _in_pkt_size, _out_buf_size, _out_pkt_size);
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_peer->set_no_delay(true);
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_on_connect(protocol);
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break;
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}
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_resp_pos += 1;
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}
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}
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}
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bool WSLClient::_verify_headers(String &r_protocol) {
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String s = (char *)_resp_buf;
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Vector<String> psa = s.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] != "HTTP/1.1" || req[1] != "101", false, "Invalid protocol or status code.");
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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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}
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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_NC(NAME, VALUE) \
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ERR_FAIL_COND_V_MSG(!headers.has(NAME) || headers[NAME] != VALUE, false, \
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"Missing or invalid header '" + String(NAME) + "'. Expected value '" + VALUE + "'.");
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_WSL_CHECK("connection", "upgrade");
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_WSL_CHECK("upgrade", "websocket");
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_WSL_CHECK_NC("sec-websocket-accept", WSLPeer::compute_key_response(_key));
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#undef _WSL_CHECK_NC
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#undef _WSL_CHECK
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if (_protocols.size() == 0) {
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// We didn't request a custom protocol
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ERR_FAIL_COND_V(headers.has("sec-websocket-protocol"), false);
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} else {
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ERR_FAIL_COND_V(!headers.has("sec-websocket-protocol"), false);
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r_protocol = headers["sec-websocket-protocol"];
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bool valid = false;
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for (int i = 0; i < _protocols.size(); i++) {
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if (_protocols[i] != r_protocol) {
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continue;
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}
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valid = true;
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break;
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}
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if (!valid) {
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return false;
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}
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}
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return true;
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}
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Error WSLClient::connect_to_host(String p_host, String p_path, uint16_t p_port, bool p_ssl, const Vector<String> p_protocols, const Vector<String> p_custom_headers) {
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ERR_FAIL_COND_V(_connection.is_valid(), ERR_ALREADY_IN_USE);
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ERR_FAIL_COND_V(p_path.is_empty(), ERR_INVALID_PARAMETER);
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_peer = Ref<WSLPeer>(memnew(WSLPeer));
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if (p_host.is_valid_ip_address()) {
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ip_candidates.clear();
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ip_candidates.push_back(IPAddress(p_host));
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} else {
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ip_candidates = IP::get_singleton()->resolve_hostname_addresses(p_host);
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}
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ERR_FAIL_COND_V(ip_candidates.is_empty(), ERR_INVALID_PARAMETER);
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String port = "";
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if ((p_port != 80 && !p_ssl) || (p_port != 443 && p_ssl)) {
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port = ":" + itos(p_port);
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}
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Error err = ERR_BUG; // Should be at least one entry.
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while (ip_candidates.size() > 0) {
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err = _tcp->connect_to_host(ip_candidates.pop_front(), p_port);
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if (err == OK) {
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break;
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}
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}
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if (err != OK) {
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_tcp->disconnect_from_host();
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_on_error();
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return err;
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}
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_connection = _tcp;
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_use_ssl = p_ssl;
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_host = p_host;
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_port = p_port;
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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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_key = WSLPeer::generate_key();
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// TODO custom extra headers (allow overriding this too?)
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String request = "GET " + p_path + " HTTP/1.1\r\n";
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request += "Host: " + p_host + port + "\r\n";
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request += "Upgrade: websocket\r\n";
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request += "Connection: Upgrade\r\n";
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request += "Sec-WebSocket-Key: " + _key + "\r\n";
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request += "Sec-WebSocket-Version: 13\r\n";
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if (p_protocols.size() > 0) {
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request += "Sec-WebSocket-Protocol: ";
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for (int i = 0; i < p_protocols.size(); i++) {
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if (i != 0) {
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request += ",";
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}
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request += p_protocols[i];
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}
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request += "\r\n";
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}
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for (int i = 0; i < p_custom_headers.size(); i++) {
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request += p_custom_headers[i] + "\r\n";
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}
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request += "\r\n";
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_request = request.utf8();
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return OK;
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}
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int WSLClient::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 WSLClient::poll() {
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if (_peer->is_connected_to_host()) {
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_peer->poll();
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if (!_peer->is_connected_to_host()) {
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disconnect_from_host();
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_on_disconnect(_peer->close_code != -1);
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}
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return;
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}
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if (_connection.is_null()) {
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return; // Not connected.
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}
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switch (_tcp->get_status()) {
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case StreamPeerTCP::STATUS_NONE:
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// Clean close
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disconnect_from_host();
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_on_error();
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break;
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case StreamPeerTCP::STATUS_CONNECTED: {
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ip_candidates.clear();
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Ref<StreamPeerSSL> ssl;
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if (_use_ssl) {
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if (_connection == _tcp) {
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// Start SSL handshake
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ssl = Ref<StreamPeerSSL>(StreamPeerSSL::create());
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ERR_FAIL_COND_MSG(ssl.is_null(), "SSL is not available in this build.");
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ssl->set_blocking_handshake_enabled(false);
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if (ssl->connect_to_stream(_tcp, verify_ssl, _host, ssl_cert) != OK) {
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disconnect_from_host();
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_on_error();
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return;
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}
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_connection = ssl;
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} else {
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ssl = static_cast<Ref<StreamPeerSSL>>(_connection);
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ERR_FAIL_COND(ssl.is_null()); // Bug?
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ssl->poll();
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}
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if (ssl->get_status() == StreamPeerSSL::STATUS_HANDSHAKING) {
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return; // Need more polling.
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} else if (ssl->get_status() != StreamPeerSSL::STATUS_CONNECTED) {
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disconnect_from_host();
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_on_error();
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return; // Error.
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}
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}
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// Do websocket handshake.
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_do_handshake();
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} break;
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case StreamPeerTCP::STATUS_ERROR:
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while (ip_candidates.size() > 0) {
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_tcp->disconnect_from_host();
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if (_tcp->connect_to_host(ip_candidates.pop_front(), _port) == OK) {
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return;
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}
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}
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disconnect_from_host();
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_on_error();
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break;
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case StreamPeerTCP::STATUS_CONNECTING:
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break; // Wait for connection
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}
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}
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Ref<WebSocketPeer> WSLClient::get_peer(int p_peer_id) const {
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ERR_FAIL_COND_V(p_peer_id != 1, nullptr);
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return _peer;
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}
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MultiplayerPeer::ConnectionStatus WSLClient::get_connection_status() const {
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if (_peer->is_connected_to_host()) {
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return CONNECTION_CONNECTED;
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}
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if (_tcp->is_connected_to_host()) {
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return CONNECTION_CONNECTING;
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}
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return CONNECTION_DISCONNECTED;
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}
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void WSLClient::disconnect_from_host(int p_code, String p_reason) {
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_peer->close(p_code, p_reason);
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_connection = Ref<StreamPeer>(nullptr);
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_tcp = Ref<StreamPeerTCP>(memnew(StreamPeerTCP));
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_key = "";
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_host = "";
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_protocols.clear();
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_use_ssl = false;
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_request = "";
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_requested = 0;
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memset(_resp_buf, 0, sizeof(_resp_buf));
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_resp_pos = 0;
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ip_candidates.clear();
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}
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IPAddress WSLClient::get_connected_host() const {
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ERR_FAIL_COND_V(!_peer->is_connected_to_host(), IPAddress());
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return _peer->get_connected_host();
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}
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uint16_t WSLClient::get_connected_port() const {
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ERR_FAIL_COND_V(!_peer->is_connected_to_host(), 0);
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return _peer->get_connected_port();
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}
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Error WSLClient::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(_connection.is_valid(), 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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WSLClient::WSLClient() {
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_peer.instantiate();
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_tcp.instantiate();
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disconnect_from_host();
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}
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WSLClient::~WSLClient() {
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_peer->close_now();
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_peer->invalidate();
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disconnect_from_host();
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}
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#endif // JAVASCRIPT_ENABLED
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