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godot/modules/websocket/wsl_client.cpp

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/*************************************************************************/
/* wsl_client.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 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_client.h"
#include "core/io/ip.h"
#include "core/project_settings.h"
void WSLClient::_do_handshake() {
if (_requested < _request.size() - 1) {
int sent = 0;
Error err = _connection->put_partial_data(((const uint8_t *)_request.get_data() + _requested), _request.size() - _requested - 1, sent);
// Sending handshake failed
if (err != OK) {
disconnect_from_host();
_on_error();
return;
}
_requested += sent;
} else {
int read = 0;
while (true) {
if (_resp_pos >= WSL_MAX_HEADER_SIZE) {
// Header is too big
disconnect_from_host();
_on_error();
ERR_EXPLAIN("Response headers too big");
ERR_FAIL();
}
Error err = _connection->get_partial_data(&_resp_buf[_resp_pos], 1, read);
if (err == ERR_FILE_EOF) {
// We got a disconnect.
disconnect_from_host();
_on_error();
return;
} else if (err != OK) {
// Got some error.
disconnect_from_host();
_on_error();
return;
} else if (read != 1) {
// Busy, wait next poll.
break;
}
// Check "\r\n\r\n" header terminator
char *r = (char *)_resp_buf;
int l = _resp_pos;
if (l > 3 && r[l] == '\n' && r[l - 1] == '\r' && r[l - 2] == '\n' && r[l - 3] == '\r') {
r[l - 3] = '\0';
String protocol;
// Response is over, verify headers and create peer.
if (!_verify_headers(protocol)) {
disconnect_from_host();
_on_error();
ERR_EXPLAIN("Invalid response headers");
ERR_FAIL();
}
// Create peer.
WSLPeer::PeerData *data = memnew(struct WSLPeer::PeerData);
data->obj = this;
data->conn = _connection;
data->is_server = false;
data->id = 1;
_peer->make_context(data, _in_buf_size, _in_pkt_size, _out_buf_size, _out_pkt_size);
_on_connect(protocol);
break;
}
_resp_pos += 1;
}
}
}
bool WSLClient::_verify_headers(String &r_protocol) {
String s = (char *)_resp_buf;
Vector<String> psa = s.split("\r\n");
int len = psa.size();
if (len < 4) {
ERR_EXPLAIN("Not enough response headers.");
ERR_FAIL_V(false);
}
Vector<String> req = psa[0].split(" ", false);
if (req.size() < 2) {
ERR_EXPLAIN("Invalid protocol or status code.");
ERR_FAIL_V(false);
}
// Wrong protocol
if (req[0] != "HTTP/1.1" || req[1] != "101") {
ERR_EXPLAIN("Invalid protocol or status code.");
ERR_FAIL_V(false);
}
Map<String, String> headers;
for (int i = 1; i < len; i++) {
Vector<String> header = psa[i].split(":", false, 1);
if (header.size() != 2) {
ERR_EXPLAIN("Invalid header -> " + psa[i]);
ERR_FAIL_V(false);
}
String name = header[0].to_lower();
String value = header[1].strip_edges();
if (headers.has(name))
headers[name] += "," + value;
else
headers[name] = value;
}
#define _WLS_EXPLAIN(NAME, VALUE) \
ERR_EXPLAIN("Missing or invalid header '" + String(NAME) + "'. Expected value '" + VALUE + "'");
#define _WLS_CHECK(NAME, VALUE) \
_WLS_EXPLAIN(NAME, VALUE); \
ERR_FAIL_COND_V(!headers.has(NAME) || headers[NAME].to_lower() != VALUE, false);
#define _WLS_CHECK_NC(NAME, VALUE) \
_WLS_EXPLAIN(NAME, VALUE); \
ERR_FAIL_COND_V(!headers.has(NAME) || headers[NAME] != VALUE, false);
_WLS_CHECK("connection", "upgrade");
_WLS_CHECK("upgrade", "websocket");
_WLS_CHECK_NC("sec-websocket-accept", WSLPeer::compute_key_response(_key));
if (_protocols.size() == 0) {
// We didn't request a custom protocol
ERR_FAIL_COND_V(headers.has("sec-websocket-protocol"), false);
} else {
ERR_FAIL_COND_V(!headers.has("sec-websocket-protocol"), false);
r_protocol = headers["sec-websocket-protocol"];
bool valid = false;
for (int i = 0; i < _protocols.size(); i++) {
if (_protocols[i] != r_protocol)
continue;
valid = true;
break;
}
if (!valid)
return false;
}
#undef _WLS_CHECK_NC
#undef _WLS_CHECK
#undef _WLS_EXPLAIN
return true;
}
Error WSLClient::connect_to_host(String p_host, String p_path, uint16_t p_port, bool p_ssl, PoolVector<String> p_protocols) {
ERR_FAIL_COND_V(_connection.is_valid(), ERR_ALREADY_IN_USE);
_peer = Ref<WSLPeer>(memnew(WSLPeer));
IP_Address addr;
if (!p_host.is_valid_ip_address()) {
addr = IP::get_singleton()->resolve_hostname(p_host);
} else {
addr = p_host;
}
ERR_FAIL_COND_V(!addr.is_valid(), ERR_INVALID_PARAMETER);
String port = "";
if ((p_port != 80 && !p_ssl) || (p_port != 443 && p_ssl)) {
port = ":" + itos(p_port);
}
Error err = _tcp->connect_to_host(addr, p_port);
if (err != OK) {
_tcp->disconnect_from_host();
_on_error();
return err;
}
_connection = _tcp;
_use_ssl = p_ssl;
_host = p_host;
_protocols = p_protocols;
_key = WSLPeer::generate_key();
// TODO custom extra headers (allow overriding this too?)
String request = "GET " + p_path + " HTTP/1.1\r\n";
request += "Host: " + p_host + port + "\r\n";
request += "Upgrade: websocket\r\n";
request += "Connection: Upgrade\r\n";
request += "Sec-WebSocket-Key: " + _key + "\r\n";
request += "Sec-WebSocket-Version: 13\r\n";
if (p_protocols.size() > 0) {
request += "Sec-WebSocket-Protocol: ";
for (int i = 0; i < p_protocols.size(); i++) {
if (i != 0)
request += ",";
request += p_protocols[i];
}
request += "\r\n";
}
request += "\r\n";
_request = request.utf8();
return OK;
}
int WSLClient::get_max_packet_size() const {
return (1 << _out_buf_size) - PROTO_SIZE;
}
void WSLClient::poll() {
if (_peer->is_connected_to_host()) {
_peer->poll();
if (!_peer->is_connected_to_host()) {
disconnect_from_host();
_on_disconnect(_peer->close_code != -1);
}
return;
}
if (_connection.is_null())
return; // Not connected.
switch (_tcp->get_status()) {
case StreamPeerTCP::STATUS_NONE:
// Clean close
disconnect_from_host();
_on_error();
break;
case StreamPeerTCP::STATUS_CONNECTED: {
Ref<StreamPeerSSL> ssl;
if (_use_ssl) {
if (_connection == _tcp) {
// Start SSL handshake
ssl = Ref<StreamPeerSSL>(StreamPeerSSL::create());
ERR_EXPLAIN("SSL is not available in this build");
ERR_FAIL_COND(ssl.is_null());
ssl->set_blocking_handshake_enabled(false);
if (ssl->connect_to_stream(_tcp, verify_ssl, _host) != OK) {
disconnect_from_host();
_on_error();
return;
}
_connection = ssl;
} else {
ssl = static_cast<Ref<StreamPeerSSL> >(_connection);
ERR_FAIL_COND(ssl.is_null()); // Bug?
ssl->poll();
}
if (ssl->get_status() == StreamPeerSSL::STATUS_HANDSHAKING)
return; // Need more polling.
else if (ssl->get_status() != StreamPeerSSL::STATUS_CONNECTED) {
disconnect_from_host();
_on_error();
return; // Error.
}
}
// Do websocket handshake.
_do_handshake();
} break;
case StreamPeerTCP::STATUS_ERROR:
disconnect_from_host();
_on_error();
break;
case StreamPeerTCP::STATUS_CONNECTING:
break; // Wait for connection
}
}
Ref<WebSocketPeer> WSLClient::get_peer(int p_peer_id) const {
ERR_FAIL_COND_V(p_peer_id != 1, NULL);
return _peer;
}
NetworkedMultiplayerPeer::ConnectionStatus WSLClient::get_connection_status() const {
if (_peer->is_connected_to_host())
return CONNECTION_CONNECTED;
if (_tcp->is_connected_to_host())
return CONNECTION_CONNECTING;
return CONNECTION_DISCONNECTED;
}
void WSLClient::disconnect_from_host(int p_code, String p_reason) {
_peer->close(p_code, p_reason);
_connection = Ref<StreamPeer>(NULL);
_tcp = Ref<StreamPeerTCP>(memnew(StreamPeerTCP));
_key = "";
_host = "";
_protocols.resize(0);
_use_ssl = false;
_request = "";
_requested = 0;
memset(_resp_buf, 0, sizeof(_resp_buf));
_resp_pos = 0;
}
IP_Address WSLClient::get_connected_host() const {
return IP_Address();
}
uint16_t WSLClient::get_connected_port() const {
return 1025;
}
Error WSLClient::set_buffers(int p_in_buffer, int p_in_packets, int p_out_buffer, int p_out_packets) {
ERR_EXPLAIN("Buffers sizes can only be set before listening or connecting");
ERR_FAIL_COND_V(_connection.is_valid(), FAILED);
_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;
}
WSLClient::WSLClient() {
_in_buf_size = nearest_shift((int)GLOBAL_GET(WSC_IN_BUF) - 1) + 10;
_in_pkt_size = nearest_shift((int)GLOBAL_GET(WSC_IN_PKT) - 1);
_out_buf_size = nearest_shift((int)GLOBAL_GET(WSC_OUT_BUF) - 1) + 10;
_out_pkt_size = nearest_shift((int)GLOBAL_GET(WSC_OUT_PKT) - 1);
_peer.instance();
_tcp.instance();
disconnect_from_host();
}
WSLClient::~WSLClient() {
_peer->close_now();
_peer->invalidate();
disconnect_from_host();
}
#endif // JAVASCRIPT_ENABLED
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