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godot/modules/websocket/wsl_server.cpp

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/*************************************************************************/
/* wsl_server.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 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.is_empty()) {
break;
}
}
if (protocol.is_empty()) { // 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.is_empty()) {
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 (const KeyValue<int, Ref<WebSocketPeer>> &E : _peer_map) {
Ref<WSLPeer> peer = (WSLPeer *)E.value.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 (const KeyValue<int, Ref<WebSocketPeer>> &E : _peer_map) {
Ref<WSLPeer> peer = (WSLPeer *)E.value.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
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